Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

18 files changed, 10281 insertions, 0 deletions

diff --git a/drivers/scsi/arm/Kconfig b/drivers/scsi/arm/Kconfig
new file mode 100644
index 000000000..9f64133f9
--- /dev/null
+++ b/drivers/scsi/arm/Kconfig
@@ -0,0 +1,74 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# SCSI driver configuration for Acorn
+#
+config SCSI_ACORNSCSI_3
+	tristate "Acorn SCSI card (aka30) support"
+	depends on ARCH_ACORN && SCSI
+	select SCSI_SPI_ATTRS
+	help
+	  This enables support for the Acorn SCSI card (aka30). If you have an
+	  Acorn system with one of these, say Y. If unsure, say N.
+
+config SCSI_ACORNSCSI_SYNC
+	bool "Support SCSI 2 Synchronous Transfers"
+	depends on SCSI_ACORNSCSI_3
+	help
+	  Say Y here to enable synchronous transfer negotiation with all
+	  targets on the Acorn SCSI card.
+
+	  In general, this improves performance; however some SCSI devices
+	  don't implement it properly, so the safe answer is N.
+
+config SCSI_ARXESCSI
+	tristate "ARXE SCSI support"
+	depends on ARCH_ACORN && SCSI
+	help
+	  Around 1991, Arxe Systems Limited released a high density floppy
+	  disc interface for the Acorn Archimedes range, to allow the use of
+	  HD discs from the then new A5000 on earlier models. This interface
+	  was either sold on its own or with an integral SCSI controller.
+	  Technical details on this NCR53c94-based device are available at
+	  <http://www.cryton.demon.co.uk/acornbits/scsi_arxe.html>
+	  Say Y here to compile in support for the SCSI controller.
+
+config SCSI_CUMANA_2
+	tristate "CumanaSCSI II support"
+	depends on ARCH_ACORN && SCSI
+	help
+	  This enables support for the Cumana SCSI II card. If you have an
+	  Acorn system with one of these, say Y. If unsure, say N.
+
+config SCSI_EESOXSCSI
+	tristate "EESOX support"
+	depends on ARCH_ACORN && SCSI
+	help
+	  This enables support for the EESOX SCSI card. If you have an Acorn
+	  system with one of these, say Y, otherwise say N.
+
+config SCSI_POWERTECSCSI
+	tristate "PowerTec support"
+	depends on ARCH_ACORN && SCSI
+	help
+	  This enables support for the Powertec SCSI card on Acorn systems. If
+	  you have one of these, say Y. If unsure, say N.
+
+comment "The following drivers are not fully supported"
+	depends on ARCH_ACORN
+
+config SCSI_CUMANA_1
+	tristate "CumanaSCSI I support"
+	depends on ARCH_ACORN && SCSI
+	select SCSI_SPI_ATTRS
+	help
+	  This enables support for the Cumana SCSI I card. If you have an
+	  Acorn system with one of these, say Y. If unsure, say N.
+
+config SCSI_OAK1
+	tristate "Oak SCSI support"
+	depends on ARCH_ACORN && SCSI
+	select SCSI_SPI_ATTRS
+	help
+	  This enables support for the Oak SCSI card. If you have an Acorn
+	  system with one of these, say Y. If unsure, say N.
+
diff --git a/drivers/scsi/arm/Makefile b/drivers/scsi/arm/Makefile
new file mode 100644
index 000000000..b576d9276
--- /dev/null
+++ b/drivers/scsi/arm/Makefile
@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for drivers/scsi/arm
+#
+
+acornscsi_mod-objs	:= acornscsi.o acornscsi-io.o
+
+obj-$(CONFIG_SCSI_ACORNSCSI_3)	+= acornscsi_mod.o queue.o msgqueue.o
+obj-$(CONFIG_SCSI_ARXESCSI)	+= arxescsi.o fas216.o queue.o msgqueue.o
+obj-$(CONFIG_SCSI_CUMANA_1)	+= cumana_1.o
+obj-$(CONFIG_SCSI_CUMANA_2)	+= cumana_2.o fas216.o queue.o msgqueue.o
+obj-$(CONFIG_SCSI_OAK1)		+= oak.o
+obj-$(CONFIG_SCSI_POWERTECSCSI)	+= powertec.o fas216.o queue.o msgqueue.o
+obj-$(CONFIG_SCSI_EESOXSCSI)	+= eesox.o fas216.o queue.o msgqueue.o
diff --git a/drivers/scsi/arm/acornscsi-io.S b/drivers/scsi/arm/acornscsi-io.S
new file mode 100644
index 000000000..fdd7237bb
--- /dev/null
+++ b/drivers/scsi/arm/acornscsi-io.S
@@ -0,0 +1,135 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ *  linux/drivers/acorn/scsi/acornscsi-io.S: Acorn SCSI card IO
+ */
+#include <linux/linkage.h>
+
+#include <asm/assembler.h>
+#include <mach/hardware.h>
+
+#if defined(__APCS_32__)
+#define LOADREGS(t,r,l...)	ldm##t	r, l
+#elif defined(__APCS_26__)
+#define LOADREGS(t,r,l...)	ldm##t	r, l##^
+#endif
+
+@ Purpose: transfer a block of data from the acorn scsi card to memory
+@ Proto  : void acornscsi_in(unsigned int addr_start, char *buffer, int length)
+@ Returns: nothing
+
+		.align
+ENTRY(__acornscsi_in)
+		stmfd	sp!, {r4 - r7, lr}
+		bic	r0, r0, #3
+		mov	lr, #0xff
+		orr	lr, lr, #0xff00
+acornscsi_in16lp:
+		subs	r2, r2, #16
+		bmi	acornscsi_in8
+		ldmia	r0!, {r3, r4, r5, r6}
+		and	r3, r3, lr
+		orr	r3, r3, r4, lsl #16
+		and 	r4, r5, lr
+		orr	r4, r4, r6, lsl #16
+		ldmia	r0!, {r5, r6, r7, ip}
+		and	r5, r5, lr
+		orr	r5, r5, r6, lsl #16
+		and	r6, r7, lr
+		orr	r6, r6, ip, lsl #16
+		stmia	r1!, {r3 - r6}
+		bne	acornscsi_in16lp
+		LOADREGS(fd, sp!, {r4 - r7, pc})
+
+acornscsi_in8:	adds	r2, r2, #8
+		bmi	acornscsi_in4
+		ldmia	r0!, {r3, r4, r5, r6}
+		and	r3, r3, lr
+		orr	r3, r3, r4, lsl #16
+		and	r4, r5, lr
+		orr	r4, r4, r6, lsl #16
+		stmia	r1!, {r3 - r4}
+		LOADREGS(eqfd, sp!, {r4 - r7, pc})
+		sub	r2, r2, #8
+
+acornscsi_in4:	adds	r2, r2, #4
+		bmi	acornscsi_in2
+		ldmia	r0!, {r3, r4}
+		and	r3, r3, lr
+		orr	r3, r3, r4, lsl #16
+		str	r3, [r1], #4
+		LOADREGS(eqfd, sp!, {r4 - r7, pc})
+		sub	r2, r2, #4
+
+acornscsi_in2:	adds	r2, r2, #2
+		ldr	r3, [r0], #4
+		and	r3, r3, lr
+		strb	r3, [r1], #1
+		mov	r3, r3, lsr #8
+		strplb	r3, [r1], #1
+		LOADREGS(fd, sp!, {r4 - r7, pc})
+
+@ Purpose: transfer a block of data from memory to the acorn scsi card
+@ Proto  : void acornscsi_in(unsigned int addr_start, char *buffer, int length)
+@ Returns: nothing
+
+ENTRY(__acornscsi_out)
+		stmfd	sp!, {r4 - r6, lr}
+		bic	r0, r0, #3
+acornscsi_out16lp:
+		subs	r2, r2, #16
+		bmi	acornscsi_out8
+		ldmia	r1!, {r4, r6, ip, lr}
+		mov	r3, r4, lsl #16
+		orr	r3, r3, r3, lsr #16
+		mov	r4, r4, lsr #16
+		orr	r4, r4, r4, lsl #16
+		mov	r5, r6, lsl #16
+		orr	r5, r5, r5, lsr #16
+		mov	r6, r6, lsr #16
+		orr	r6, r6, r6, lsl #16
+		stmia	r0!, {r3, r4, r5, r6}
+		mov	r3, ip, lsl #16
+		orr	r3, r3, r3, lsr #16
+		mov	r4, ip, lsr #16
+		orr	r4, r4, r4, lsl #16
+		mov	ip, lr, lsl #16
+		orr	ip, ip, ip, lsr #16
+		mov	lr, lr, lsr #16
+		orr	lr, lr, lr, lsl #16
+		stmia	r0!, {r3, r4, ip, lr}
+		bne	acornscsi_out16lp
+		LOADREGS(fd, sp!, {r4 - r6, pc})
+
+acornscsi_out8:	adds	r2, r2, #8
+		bmi	acornscsi_out4
+		ldmia	r1!, {r4, r6}
+		mov	r3, r4, lsl #16
+		orr	r3, r3, r3, lsr #16
+		mov	r4, r4, lsr #16
+		orr	r4, r4, r4, lsl #16
+		mov	r5, r6, lsl #16
+		orr	r5, r5, r5, lsr #16
+		mov	r6, r6, lsr #16
+		orr	r6, r6, r6, lsl #16
+		stmia	r0!, {r3, r4, r5, r6}
+		LOADREGS(eqfd, sp!, {r4 - r6, pc})
+
+		sub	r2, r2, #8
+acornscsi_out4:	adds	r2, r2, #4
+		bmi	acornscsi_out2
+		ldr	r4, [r1], #4
+		mov	r3, r4, lsl #16
+		orr	r3, r3, r3, lsr #16
+		mov	r4, r4, lsr #16
+		orr	r4, r4, r4, lsl #16
+		stmia	r0!, {r3, r4}
+		LOADREGS(eqfd, sp!, {r4 - r6, pc})
+
+		sub	r2, r2, #4
+acornscsi_out2:	adds	r2, r2, #2
+		ldr	r3, [r1], #2
+		strb	r3, [r0], #1
+		mov	r3, r3, lsr #8
+		strplb	r3, [r0], #1
+		LOADREGS(fd, sp!, {r4 - r6, pc})
+
diff --git a/drivers/scsi/arm/acornscsi.c b/drivers/scsi/arm/acornscsi.c
new file mode 100644
index 000000000..7602639da
--- /dev/null
+++ b/drivers/scsi/arm/acornscsi.c
@@ -0,0 +1,2921 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  linux/drivers/acorn/scsi/acornscsi.c
+ *
+ *  Acorn SCSI 3 driver
+ *  By R.M.King.
+ *
+ * Abandoned using the Select and Transfer command since there were
+ * some nasty races between our software and the target devices that
+ * were not easy to solve, and the device errata had a lot of entries
+ * for this command, some of them quite nasty...
+ *
+ * Changelog:
+ *  26-Sep-1997	RMK	Re-jigged to use the queue module.
+ *			Re-coded state machine to be based on driver
+ *			state not scsi state.  Should be easier to debug.
+ *			Added acornscsi_release to clean up properly.
+ *			Updated proc/scsi reporting.
+ *  05-Oct-1997	RMK	Implemented writing to SCSI devices.
+ *  06-Oct-1997	RMK	Corrected small (non-serious) bug with the connect/
+ *			reconnect race condition causing a warning message.
+ *  12-Oct-1997	RMK	Added catch for re-entering interrupt routine.
+ *  15-Oct-1997	RMK	Improved handling of commands.
+ *  27-Jun-1998	RMK	Changed asm/delay.h to linux/delay.h.
+ *  13-Dec-1998	RMK	Better abort code and command handling.  Extra state
+ *			transitions added to allow dodgy devices to work.
+ */
+#define DEBUG_NO_WRITE	1
+#define DEBUG_QUEUES	2
+#define DEBUG_DMA	4
+#define DEBUG_ABORT	8
+#define DEBUG_DISCON	16
+#define DEBUG_CONNECT	32
+#define DEBUG_PHASES	64
+#define DEBUG_WRITE	128
+#define DEBUG_LINK	256
+#define DEBUG_MESSAGES	512
+#define DEBUG_RESET	1024
+#define DEBUG_ALL	(DEBUG_RESET|DEBUG_MESSAGES|DEBUG_LINK|DEBUG_WRITE|\
+			 DEBUG_PHASES|DEBUG_CONNECT|DEBUG_DISCON|DEBUG_ABORT|\
+			 DEBUG_DMA|DEBUG_QUEUES)
+
+/* DRIVER CONFIGURATION
+ *
+ * SCSI-II Tagged queue support.
+ *
+ * I don't have any SCSI devices that support it, so it is totally untested
+ * (except to make sure that it doesn't interfere with any non-tagging
+ * devices).  It is not fully implemented either - what happens when a
+ * tagging device reconnects???
+ *
+ * You can tell if you have a device that supports tagged queueing my
+ * cating (eg) /proc/scsi/acornscsi/0 and see if the SCSI revision is reported
+ * as '2 TAG'.
+ */
+
+/*
+ * SCSI-II Synchronous transfer support.
+ *
+ * Tried and tested...
+ *
+ * SDTR_SIZE	  - maximum number of un-acknowledged bytes (0 = off, 12 = max)
+ * SDTR_PERIOD	  - period of REQ signal (min=125, max=1020)
+ * DEFAULT_PERIOD - default REQ period.
+ */
+#define SDTR_SIZE	12
+#define SDTR_PERIOD	125
+#define DEFAULT_PERIOD	500
+
+/*
+ * Debugging information
+ *
+ * DEBUG	  - bit mask from list above
+ * DEBUG_TARGET   - is defined to the target number if you want to debug
+ *		    a specific target. [only recon/write/dma].
+ */
+#define DEBUG (DEBUG_RESET|DEBUG_WRITE|DEBUG_NO_WRITE)
+/* only allow writing to SCSI device 0 */
+#define NO_WRITE 0xFE
+/*#define DEBUG_TARGET 2*/
+/*
+ * Select timeout time (in 10ms units)
+ *
+ * This is the timeout used between the start of selection and the WD33C93
+ * chip deciding that the device isn't responding.
+ */
+#define TIMEOUT_TIME 10
+/*
+ * Define this if you want to have verbose explanation of SCSI
+ * status/messages.
+ */
+#undef CONFIG_ACORNSCSI_CONSTANTS
+/*
+ * Define this if you want to use the on board DMAC [don't remove this option]
+ * If not set, then use PIO mode (not currently supported).
+ */
+#define USE_DMAC
+
+/*
+ * ====================================================================================
+ */
+
+#ifdef DEBUG_TARGET
+#define DBG(cmd,xxx...) \
+  if (cmd->device->id == DEBUG_TARGET) { \
+    xxx; \
+  }
+#else
+#define DBG(cmd,xxx...) xxx
+#endif
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/signal.h>
+#include <linux/errno.h>
+#include <linux/proc_fs.h>
+#include <linux/ioport.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/stringify.h>
+#include <linux/io.h>
+
+#include <asm/ecard.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_transport_spi.h>
+#include "acornscsi.h"
+#include "msgqueue.h"
+#include "arm_scsi.h"
+
+#include <scsi/scsicam.h>
+
+#define VER_MAJOR 2
+#define VER_MINOR 0
+#define VER_PATCH 6
+
+#ifdef USE_DMAC
+/*
+ * DMAC setup parameters
+ */ 
+#define INIT_DEVCON0	(DEVCON0_RQL|DEVCON0_EXW|DEVCON0_CMP)
+#define INIT_DEVCON1	(DEVCON1_BHLD)
+#define DMAC_READ	(MODECON_READ)
+#define DMAC_WRITE	(MODECON_WRITE)
+#define INIT_SBICDMA	(CTRL_DMABURST)
+
+#define scsi_xferred	have_data_in
+
+/*
+ * Size of on-board DMA buffer
+ */
+#define DMAC_BUFFER_SIZE	65536
+#endif
+
+#define STATUS_BUFFER_TO_PRINT	24
+
+unsigned int sdtr_period = SDTR_PERIOD;
+unsigned int sdtr_size   = SDTR_SIZE;
+
+static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp,
+			   unsigned int result);
+static int acornscsi_reconnect_finish(AS_Host *host);
+static void acornscsi_dma_cleanup(AS_Host *host);
+static void acornscsi_abortcmd(AS_Host *host);
+
+/* ====================================================================================
+ * Miscellaneous
+ */
+
+/* Offsets from MEMC base */
+#define SBIC_REGIDX	0x2000
+#define SBIC_REGVAL	0x2004
+#define DMAC_OFFSET	0x3000
+
+/* Offsets from FAST IOC base */
+#define INT_REG		0x2000
+#define PAGE_REG	0x3000
+
+static inline void sbic_arm_write(AS_Host *host, unsigned int reg, unsigned int value)
+{
+    writeb(reg, host->base + SBIC_REGIDX);
+    writeb(value, host->base + SBIC_REGVAL);
+}
+
+static inline int sbic_arm_read(AS_Host *host, unsigned int reg)
+{
+    if(reg == SBIC_ASR)
+	   return readl(host->base + SBIC_REGIDX) & 255;
+    writeb(reg, host->base + SBIC_REGIDX);
+    return readl(host->base + SBIC_REGVAL) & 255;
+}
+
+#define sbic_arm_writenext(host, val)	writeb((val), (host)->base + SBIC_REGVAL)
+#define sbic_arm_readnext(host) 	readb((host)->base + SBIC_REGVAL)
+
+#ifdef USE_DMAC
+#define dmac_read(host,reg) \
+	readb((host)->base + DMAC_OFFSET + ((reg) << 2))
+
+#define dmac_write(host,reg,value) \
+	({ writeb((value), (host)->base + DMAC_OFFSET + ((reg) << 2)); })
+
+#define dmac_clearintr(host) 	writeb(0, (host)->fast + INT_REG)
+
+static inline unsigned int dmac_address(AS_Host *host)
+{
+    return dmac_read(host, DMAC_TXADRHI) << 16 |
+	   dmac_read(host, DMAC_TXADRMD) << 8 |
+	   dmac_read(host, DMAC_TXADRLO);
+}
+
+static
+void acornscsi_dumpdma(AS_Host *host, char *where)
+{
+	unsigned int mode, addr, len;
+
+	mode = dmac_read(host, DMAC_MODECON);
+	addr = dmac_address(host);
+	len  = dmac_read(host, DMAC_TXCNTHI) << 8 |
+	       dmac_read(host, DMAC_TXCNTLO);
+
+	printk("scsi%d: %s: DMAC %02x @%06x+%04x msk %02x, ",
+		host->host->host_no, where,
+		mode, addr, (len + 1) & 0xffff,
+		dmac_read(host, DMAC_MASKREG));
+
+	printk("DMA @%06x, ", host->dma.start_addr);
+	printk("BH @%p +%04x, ", host->scsi.SCp.ptr,
+		host->scsi.SCp.this_residual);
+	printk("DT @+%04x ST @+%04x", host->dma.transferred,
+		host->scsi.SCp.scsi_xferred);
+	printk("\n");
+}
+#endif
+
+static
+unsigned long acornscsi_sbic_xfcount(AS_Host *host)
+{
+    unsigned long length;
+
+    length = sbic_arm_read(host, SBIC_TRANSCNTH) << 16;
+    length |= sbic_arm_readnext(host) << 8;
+    length |= sbic_arm_readnext(host);
+
+    return length;
+}
+
+static int
+acornscsi_sbic_wait(AS_Host *host, int stat_mask, int stat, int timeout, char *msg)
+{
+	int asr;
+
+	do {
+		asr = sbic_arm_read(host, SBIC_ASR);
+
+		if ((asr & stat_mask) == stat)
+			return 0;
+
+		udelay(1);
+	} while (--timeout);
+
+	printk("scsi%d: timeout while %s\n", host->host->host_no, msg);
+
+	return -1;
+}
+
+static
+int acornscsi_sbic_issuecmd(AS_Host *host, int command)
+{
+    if (acornscsi_sbic_wait(host, ASR_CIP, 0, 1000, "issuing command"))
+	return -1;
+
+    sbic_arm_write(host, SBIC_CMND, command);
+
+    return 0;
+}
+
+static void
+acornscsi_csdelay(unsigned int cs)
+{
+    unsigned long target_jiffies, flags;
+
+    target_jiffies = jiffies + 1 + cs * HZ / 100;
+
+    local_save_flags(flags);
+    local_irq_enable();
+
+    while (time_before(jiffies, target_jiffies)) barrier();
+
+    local_irq_restore(flags);
+}
+
+static
+void acornscsi_resetcard(AS_Host *host)
+{
+    unsigned int i, timeout;
+
+    /* assert reset line */
+    host->card.page_reg = 0x80;
+    writeb(host->card.page_reg, host->fast + PAGE_REG);
+
+    /* wait 3 cs.  SCSI standard says 25ms. */
+    acornscsi_csdelay(3);
+
+    host->card.page_reg = 0;
+    writeb(host->card.page_reg, host->fast + PAGE_REG);
+
+    /*
+     * Should get a reset from the card
+     */
+    timeout = 1000;
+    do {
+	if (readb(host->fast + INT_REG) & 8)
+	    break;
+	udelay(1);
+    } while (--timeout);
+
+    if (timeout == 0)
+	printk("scsi%d: timeout while resetting card\n",
+		host->host->host_no);
+
+    sbic_arm_read(host, SBIC_ASR);
+    sbic_arm_read(host, SBIC_SSR);
+
+    /* setup sbic - WD33C93A */
+    sbic_arm_write(host, SBIC_OWNID, OWNID_EAF | host->host->this_id);
+    sbic_arm_write(host, SBIC_CMND, CMND_RESET);
+
+    /*
+     * Command should cause a reset interrupt
+     */
+    timeout = 1000;
+    do {
+	if (readb(host->fast + INT_REG) & 8)
+	    break;
+	udelay(1);
+    } while (--timeout);
+
+    if (timeout == 0)
+	printk("scsi%d: timeout while resetting card\n",
+		host->host->host_no);
+
+    sbic_arm_read(host, SBIC_ASR);
+    if (sbic_arm_read(host, SBIC_SSR) != 0x01)
+	printk(KERN_CRIT "scsi%d: WD33C93A didn't give enhanced reset interrupt\n",
+		host->host->host_no);
+
+    sbic_arm_write(host, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI);
+    sbic_arm_write(host, SBIC_TIMEOUT, TIMEOUT_TIME);
+    sbic_arm_write(host, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA);
+    sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP);
+
+    host->card.page_reg = 0x40;
+    writeb(host->card.page_reg, host->fast + PAGE_REG);
+
+    /* setup dmac - uPC71071 */
+    dmac_write(host, DMAC_INIT, 0);
+#ifdef USE_DMAC
+    dmac_write(host, DMAC_INIT, INIT_8BIT);
+    dmac_write(host, DMAC_CHANNEL, CHANNEL_0);
+    dmac_write(host, DMAC_DEVCON0, INIT_DEVCON0);
+    dmac_write(host, DMAC_DEVCON1, INIT_DEVCON1);
+#endif
+
+    host->SCpnt = NULL;
+    host->scsi.phase = PHASE_IDLE;
+    host->scsi.disconnectable = 0;
+
+    memset(host->busyluns, 0, sizeof(host->busyluns));
+
+    for (i = 0; i < 8; i++) {
+	host->device[i].sync_state = SYNC_NEGOCIATE;
+	host->device[i].disconnect_ok = 1;
+    }
+
+    /* wait 25 cs.  SCSI standard says 250ms. */
+    acornscsi_csdelay(25);
+}
+
+/*=============================================================================================
+ * Utility routines (eg. debug)
+ */
+#ifdef CONFIG_ACORNSCSI_CONSTANTS
+static char *acornscsi_interrupttype[] = {
+  "rst",  "suc",  "p/a",  "3",
+  "term", "5",	  "6",	  "7",
+  "serv", "9",	  "a",	  "b",
+  "c",	  "d",	  "e",	  "f"
+};
+
+static signed char acornscsi_map[] = {
+  0,  1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,
+ -1,  2, -1, -1,  -1, -1,  3, -1,   4,	5,  6,	7,   8,  9, 10, 11,
+ 12, 13, 14, -1,  -1, -1, -1, -1,   4,	5,  6,	7,   8,  9, 10, 11,
+ -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,
+ 15, 16, 17, 18,  19, -1, -1, 20,   4,	5,  6,	7,   8,  9, 10, 11,
+ -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,
+ -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,
+ -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,
+ 21, 22, -1, -1,  -1, 23, -1, -1,   4,	5,  6,	7,   8,  9, 10, 11,
+ -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,
+ -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,
+ -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,
+ -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,
+ -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,
+ -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,
+ -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1,  -1, -1, -1, -1
+};      
+
+static char *acornscsi_interruptcode[] = {
+    /* 0 */
+    "reset - normal mode",	/* 00 */
+    "reset - advanced mode",	/* 01 */
+
+    /* 2 */
+    "sel",			/* 11 */
+    "sel+xfer", 		/* 16 */
+    "data-out", 		/* 18 */
+    "data-in",			/* 19 */
+    "cmd",			/* 1A */
+    "stat",			/* 1B */
+    "??-out",			/* 1C */
+    "??-in",			/* 1D */
+    "msg-out",			/* 1E */
+    "msg-in",			/* 1F */
+
+    /* 12 */
+    "/ACK asserted",		/* 20 */
+    "save-data-ptr",		/* 21 */
+    "{re}sel",			/* 22 */
+
+    /* 15 */
+    "inv cmd",			/* 40 */
+    "unexpected disconnect",	/* 41 */
+    "sel timeout",		/* 42 */
+    "P err",			/* 43 */
+    "P err+ATN",		/* 44 */
+    "bad status byte",		/* 47 */
+
+    /* 21 */
+    "resel, no id",		/* 80 */
+    "resel",			/* 81 */
+    "discon",			/* 85 */
+};
+
+static
+void print_scsi_status(unsigned int ssr)
+{
+    if (acornscsi_map[ssr] != -1)
+	printk("%s:%s",
+		acornscsi_interrupttype[(ssr >> 4)],
+		acornscsi_interruptcode[acornscsi_map[ssr]]);
+    else
+	printk("%X:%X", ssr >> 4, ssr & 0x0f);    
+}    
+#endif
+
+static
+void print_sbic_status(int asr, int ssr, int cmdphase)
+{
+#ifdef CONFIG_ACORNSCSI_CONSTANTS
+    printk("sbic: %c%c%c%c%c%c ",
+	    asr & ASR_INT ? 'I' : 'i',
+	    asr & ASR_LCI ? 'L' : 'l',
+	    asr & ASR_BSY ? 'B' : 'b',
+	    asr & ASR_CIP ? 'C' : 'c',
+	    asr & ASR_PE  ? 'P' : 'p',
+	    asr & ASR_DBR ? 'D' : 'd');
+    printk("scsi: ");
+    print_scsi_status(ssr);
+    printk(" ph %02X\n", cmdphase);
+#else
+    printk("sbic: %02X scsi: %X:%X ph: %02X\n",
+	    asr, (ssr & 0xf0)>>4, ssr & 0x0f, cmdphase);
+#endif
+}
+
+static void
+acornscsi_dumplogline(AS_Host *host, int target, int line)
+{
+	unsigned long prev;
+	signed int ptr;
+
+	ptr = host->status_ptr[target] - STATUS_BUFFER_TO_PRINT;
+	if (ptr < 0)
+		ptr += STATUS_BUFFER_SIZE;
+
+	printk("%c: %3s:", target == 8 ? 'H' : '0' + target,
+		line == 0 ? "ph" : line == 1 ? "ssr" : "int");
+
+	prev = host->status[target][ptr].when;
+
+	for (; ptr != host->status_ptr[target]; ptr = (ptr + 1) & (STATUS_BUFFER_SIZE - 1)) {
+		unsigned long time_diff;
+
+		if (!host->status[target][ptr].when)
+			continue;
+
+		switch (line) {
+		case 0:
+			printk("%c%02X", host->status[target][ptr].irq ? '-' : ' ',
+					 host->status[target][ptr].ph);
+			break;
+
+		case 1:
+			printk(" %02X", host->status[target][ptr].ssr);
+			break;
+
+		case 2:
+			time_diff = host->status[target][ptr].when - prev;
+			prev = host->status[target][ptr].when;
+			if (time_diff == 0)
+				printk("==^");
+			else if (time_diff >= 100)
+				printk("   ");
+			else
+				printk(" %02ld", time_diff);
+			break;
+		}
+	}
+
+	printk("\n");
+}
+
+static
+void acornscsi_dumplog(AS_Host *host, int target)
+{
+    do {
+	acornscsi_dumplogline(host, target, 0);
+	acornscsi_dumplogline(host, target, 1);
+	acornscsi_dumplogline(host, target, 2);
+
+	if (target == 8)
+	    break;
+
+	target = 8;
+    } while (1);
+}
+
+static
+char acornscsi_target(AS_Host *host)
+{
+	if (host->SCpnt)
+		return '0' + host->SCpnt->device->id;
+	return 'H';
+}
+
+/*
+ * Prototype: cmdtype_t acornscsi_cmdtype(int command)
+ * Purpose  : differentiate READ from WRITE from other commands
+ * Params   : command - command to interpret
+ * Returns  : CMD_READ	- command reads data,
+ *	      CMD_WRITE - command writes data,
+ *	      CMD_MISC	- everything else
+ */
+static inline
+cmdtype_t acornscsi_cmdtype(int command)
+{
+    switch (command) {
+    case WRITE_6:  case WRITE_10:  case WRITE_12:
+	return CMD_WRITE;
+    case READ_6:   case READ_10:   case READ_12:
+	return CMD_READ;
+    default:
+	return CMD_MISC;
+    }
+}
+
+/*
+ * Prototype: int acornscsi_datadirection(int command)
+ * Purpose  : differentiate between commands that have a DATA IN phase
+ *	      and a DATA OUT phase
+ * Params   : command - command to interpret
+ * Returns  : DATADIR_OUT - data out phase expected
+ *	      DATADIR_IN  - data in phase expected
+ */
+static
+datadir_t acornscsi_datadirection(int command)
+{
+    switch (command) {
+    case CHANGE_DEFINITION:	case COMPARE:		case COPY:
+    case COPY_VERIFY:		case LOG_SELECT:	case MODE_SELECT:
+    case MODE_SELECT_10:	case SEND_DIAGNOSTIC:	case WRITE_BUFFER:
+    case FORMAT_UNIT:		case REASSIGN_BLOCKS:	case RESERVE:
+    case SEARCH_EQUAL:		case SEARCH_HIGH:	case SEARCH_LOW:
+    case WRITE_6:		case WRITE_10:		case WRITE_VERIFY:
+    case UPDATE_BLOCK:		case WRITE_LONG:	case WRITE_SAME:
+    case SEARCH_HIGH_12:	case SEARCH_EQUAL_12:	case SEARCH_LOW_12:
+    case WRITE_12:		case WRITE_VERIFY_12:	case SET_WINDOW:
+    case MEDIUM_SCAN:		case SEND_VOLUME_TAG:	case 0xea:
+	return DATADIR_OUT;
+    default:
+	return DATADIR_IN;
+    }
+}
+
+/*
+ * Purpose  : provide values for synchronous transfers with 33C93.
+ * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting
+ *	Modified by Russell King for 8MHz WD33C93A
+ */
+static struct sync_xfer_tbl {
+    unsigned int period_ns;
+    unsigned char reg_value;
+} sync_xfer_table[] = {
+    {	1, 0x20 },    { 249, 0x20 },	{ 374, 0x30 },
+    { 499, 0x40 },    { 624, 0x50 },	{ 749, 0x60 },
+    { 874, 0x70 },    { 999, 0x00 },	{   0,	  0 }
+};
+
+/*
+ * Prototype: int acornscsi_getperiod(unsigned char syncxfer)
+ * Purpose  : period for the synchronous transfer setting
+ * Params   : syncxfer SYNCXFER register value
+ * Returns  : period in ns.
+ */
+static
+int acornscsi_getperiod(unsigned char syncxfer)
+{
+    int i;
+
+    syncxfer &= 0xf0;
+    if (syncxfer == 0x10)
+	syncxfer = 0;
+
+    for (i = 1; sync_xfer_table[i].period_ns; i++)
+	if (syncxfer == sync_xfer_table[i].reg_value)
+	    return sync_xfer_table[i].period_ns;
+    return 0;
+}
+
+/*
+ * Prototype: int round_period(unsigned int period)
+ * Purpose  : return index into above table for a required REQ period
+ * Params   : period - time (ns) for REQ
+ * Returns  : table index
+ * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting
+ */
+static inline
+int round_period(unsigned int period)
+{
+    int i;
+
+    for (i = 1; sync_xfer_table[i].period_ns; i++) {
+	if ((period <= sync_xfer_table[i].period_ns) &&
+	    (period > sync_xfer_table[i - 1].period_ns))
+	    return i;
+    }
+    return 7;
+}
+
+/*
+ * Prototype: unsigned char calc_sync_xfer(unsigned int period, unsigned int offset)
+ * Purpose  : calculate value for 33c93s SYNC register
+ * Params   : period - time (ns) for REQ
+ *	      offset - offset in bytes between REQ/ACK
+ * Returns  : value for SYNC register
+ * Copyright: Copyright (c) 1996 John Shifflett, GeoLog Consulting
+ */
+static
+unsigned char __maybe_unused calc_sync_xfer(unsigned int period,
+					    unsigned int offset)
+{
+    return sync_xfer_table[round_period(period)].reg_value |
+		((offset < SDTR_SIZE) ? offset : SDTR_SIZE);
+}
+
+/* ====================================================================================
+ * Command functions
+ */
+/*
+ * Function: acornscsi_kick(AS_Host *host)
+ * Purpose : kick next command to interface
+ * Params  : host - host to send command to
+ * Returns : INTR_IDLE if idle, otherwise INTR_PROCESSING
+ * Notes   : interrupts are always disabled!
+ */
+static
+intr_ret_t acornscsi_kick(AS_Host *host)
+{
+    int from_queue = 0;
+    struct scsi_cmnd *SCpnt;
+
+    /* first check to see if a command is waiting to be executed */
+    SCpnt = host->origSCpnt;
+    host->origSCpnt = NULL;
+
+    /* retrieve next command */
+    if (!SCpnt) {
+	SCpnt = queue_remove_exclude(&host->queues.issue, host->busyluns);
+	if (!SCpnt)
+	    return INTR_IDLE;
+
+	from_queue = 1;
+    }
+
+    if (host->scsi.disconnectable && host->SCpnt) {
+	queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt);
+	host->scsi.disconnectable = 0;
+#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
+	DBG(host->SCpnt, printk("scsi%d.%c: moved command to disconnected queue\n",
+		host->host->host_no, acornscsi_target(host)));
+#endif
+	host->SCpnt = NULL;
+    }
+
+    /*
+     * If we have an interrupt pending, then we may have been reselected.
+     * In this case, we don't want to write to the registers
+     */
+    if (!(sbic_arm_read(host, SBIC_ASR) & (ASR_INT|ASR_BSY|ASR_CIP))) {
+	sbic_arm_write(host, SBIC_DESTID, SCpnt->device->id);
+	sbic_arm_write(host, SBIC_CMND, CMND_SELWITHATN);
+    }
+
+    /*
+     * claim host busy - all of these must happen atomically wrt
+     * our interrupt routine.  Failure means command loss.
+     */
+    host->scsi.phase = PHASE_CONNECTING;
+    host->SCpnt = SCpnt;
+    host->scsi.SCp = *arm_scsi_pointer(SCpnt);
+    host->dma.xfer_setup = 0;
+    host->dma.xfer_required = 0;
+    host->dma.xfer_done = 0;
+
+#if (DEBUG & (DEBUG_ABORT|DEBUG_CONNECT))
+    DBG(SCpnt,printk("scsi%d.%c: starting cmd %02X\n",
+	    host->host->host_no, '0' + SCpnt->device->id,
+	    SCpnt->cmnd[0]));
+#endif
+
+    if (from_queue) {
+	    set_bit(SCpnt->device->id * 8 +
+		    (u8)(SCpnt->device->lun & 0x07), host->busyluns);
+
+	host->stats.removes += 1;
+
+	switch (acornscsi_cmdtype(SCpnt->cmnd[0])) {
+	case CMD_WRITE:
+	    host->stats.writes += 1;
+	    break;
+	case CMD_READ:
+	    host->stats.reads += 1;
+	    break;
+	case CMD_MISC:
+	    host->stats.miscs += 1;
+	    break;
+	}
+    }
+
+    return INTR_PROCESSING;
+}    
+
+/*
+ * Function: void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp, unsigned int result)
+ * Purpose : complete processing for command
+ * Params  : host   - interface that completed
+ *	     result - driver byte of result
+ */
+static void acornscsi_done(AS_Host *host, struct scsi_cmnd **SCpntp,
+			   unsigned int result)
+{
+	struct scsi_cmnd *SCpnt = *SCpntp;
+
+    /* clean up */
+    sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP);
+
+    host->stats.fins += 1;
+
+    if (SCpnt) {
+	*SCpntp = NULL;
+
+	acornscsi_dma_cleanup(host);
+
+	set_host_byte(SCpnt, result);
+	if (result == DID_OK)
+		scsi_msg_to_host_byte(SCpnt, host->scsi.SCp.Message);
+	set_status_byte(SCpnt, host->scsi.SCp.Status);
+
+	/*
+	 * In theory, this should not happen.  In practice, it seems to.
+	 * Only trigger an error if the device attempts to report all happy
+	 * but with untransferred buffers...  If we don't do something, then
+	 * data loss will occur.  Should we check SCpnt->underflow here?
+	 * It doesn't appear to be set to something meaningful by the higher
+	 * levels all the time.
+	 */
+	if (result == DID_OK) {
+		int xfer_warn = 0;
+
+		if (SCpnt->underflow == 0) {
+			if (host->scsi.SCp.ptr &&
+			    acornscsi_cmdtype(SCpnt->cmnd[0]) != CMD_MISC)
+				xfer_warn = 1;
+		} else {
+			if (host->scsi.SCp.scsi_xferred < SCpnt->underflow ||
+			    host->scsi.SCp.scsi_xferred != host->dma.transferred)
+				xfer_warn = 1;
+		}
+
+		/* ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.6)
+		 *  Targets which break data transfers into multiple
+		 *  connections shall end each successful connection
+		 *  (except possibly the last) with a SAVE DATA
+		 *  POINTER - DISCONNECT message sequence.
+		 *
+		 * This makes it difficult to ensure that a transfer has
+		 * completed.  If we reach the end of a transfer during
+		 * the command, then we can only have finished the transfer.
+		 * therefore, if we seem to have some data remaining, this
+		 * is not a problem.
+		 */
+		if (host->dma.xfer_done)
+			xfer_warn = 0;
+
+		if (xfer_warn) {
+		    switch (get_status_byte(SCpnt)) {
+		    case SAM_STAT_CHECK_CONDITION:
+		    case SAM_STAT_COMMAND_TERMINATED:
+		    case SAM_STAT_BUSY:
+		    case SAM_STAT_TASK_SET_FULL:
+		    case SAM_STAT_RESERVATION_CONFLICT:
+			break;
+
+		    default:
+			scmd_printk(KERN_ERR, SCpnt,
+				    "incomplete data transfer detected: "
+				    "result=%08X", SCpnt->result);
+			scsi_print_command(SCpnt);
+			acornscsi_dumpdma(host, "done");
+			acornscsi_dumplog(host, SCpnt->device->id);
+			set_host_byte(SCpnt, DID_ERROR);
+		    }
+		}
+	}
+
+	clear_bit(SCpnt->device->id * 8 +
+		  (u8)(SCpnt->device->lun & 0x7), host->busyluns);
+
+	scsi_done(SCpnt);
+    } else
+	printk("scsi%d: null command in acornscsi_done", host->host->host_no);
+
+    host->scsi.phase = PHASE_IDLE;
+}
+
+/* ====================================================================================
+ * DMA routines
+ */
+/*
+ * Purpose  : update SCSI Data Pointer
+ * Notes    : this will only be one SG entry or less
+ */
+static
+void acornscsi_data_updateptr(AS_Host *host, struct scsi_pointer *SCp, unsigned int length)
+{
+    SCp->ptr += length;
+    SCp->this_residual -= length;
+
+    if (SCp->this_residual == 0 && next_SCp(SCp) == 0)
+	host->dma.xfer_done = 1;
+}
+
+/*
+ * Prototype: void acornscsi_data_read(AS_Host *host, char *ptr,
+ *				unsigned int start_addr, unsigned int length)
+ * Purpose  : read data from DMA RAM
+ * Params   : host - host to transfer from
+ *	      ptr  - DRAM address
+ *	      start_addr - host mem address
+ *	      length - number of bytes to transfer
+ * Notes    : this will only be one SG entry or less
+ */
+static
+void acornscsi_data_read(AS_Host *host, char *ptr,
+				 unsigned int start_addr, unsigned int length)
+{
+    extern void __acornscsi_in(void __iomem *, char *buf, int len);
+    unsigned int page, offset, len = length;
+
+    page = (start_addr >> 12);
+    offset = start_addr & ((1 << 12) - 1);
+
+    writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG);
+
+    while (len > 0) {
+	unsigned int this_len;
+
+	if (len + offset > (1 << 12))
+	    this_len = (1 << 12) - offset;
+	else
+	    this_len = len;
+
+	__acornscsi_in(host->base + (offset << 1), ptr, this_len);
+
+	offset += this_len;
+	ptr += this_len;
+	len -= this_len;
+
+	if (offset == (1 << 12)) {
+	    offset = 0;
+	    page ++;
+	    writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG);
+	}
+    }
+    writeb(host->card.page_reg, host->fast + PAGE_REG);
+}
+
+/*
+ * Prototype: void acornscsi_data_write(AS_Host *host, char *ptr,
+ *				unsigned int start_addr, unsigned int length)
+ * Purpose  : write data to DMA RAM
+ * Params   : host - host to transfer from
+ *	      ptr  - DRAM address
+ *	      start_addr - host mem address
+ *	      length - number of bytes to transfer
+ * Notes    : this will only be one SG entry or less
+ */
+static
+void acornscsi_data_write(AS_Host *host, char *ptr,
+				 unsigned int start_addr, unsigned int length)
+{
+    extern void __acornscsi_out(void __iomem *, char *buf, int len);
+    unsigned int page, offset, len = length;
+
+    page = (start_addr >> 12);
+    offset = start_addr & ((1 << 12) - 1);
+
+    writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG);
+
+    while (len > 0) {
+	unsigned int this_len;
+
+	if (len + offset > (1 << 12))
+	    this_len = (1 << 12) - offset;
+	else
+	    this_len = len;
+
+	__acornscsi_out(host->base + (offset << 1), ptr, this_len);
+
+	offset += this_len;
+	ptr += this_len;
+	len -= this_len;
+
+	if (offset == (1 << 12)) {
+	    offset = 0;
+	    page ++;
+	    writeb((page & 0x3f) | host->card.page_reg, host->fast + PAGE_REG);
+	}
+    }
+    writeb(host->card.page_reg, host->fast + PAGE_REG);
+}
+
+/* =========================================================================================
+ * On-board DMA routines
+ */
+#ifdef USE_DMAC
+/*
+ * Prototype: void acornscsi_dmastop(AS_Host *host)
+ * Purpose  : stop all DMA
+ * Params   : host - host on which to stop DMA
+ * Notes    : This is called when leaving DATA IN/OUT phase,
+ *	      or when interface is RESET
+ */
+static inline
+void acornscsi_dma_stop(AS_Host *host)
+{
+    dmac_write(host, DMAC_MASKREG, MASK_ON);
+    dmac_clearintr(host);
+
+#if (DEBUG & DEBUG_DMA)
+    DBG(host->SCpnt, acornscsi_dumpdma(host, "stop"));
+#endif
+}
+
+/*
+ * Function: void acornscsi_dma_setup(AS_Host *host, dmadir_t direction)
+ * Purpose : setup DMA controller for data transfer
+ * Params  : host - host to setup
+ *	     direction - data transfer direction
+ * Notes   : This is called when entering DATA I/O phase, not
+ *	     while we're in a DATA I/O phase
+ */
+static
+void acornscsi_dma_setup(AS_Host *host, dmadir_t direction)
+{
+    unsigned int address, length, mode;
+
+    host->dma.direction = direction;
+
+    dmac_write(host, DMAC_MASKREG, MASK_ON);
+
+    if (direction == DMA_OUT) {
+#if (DEBUG & DEBUG_NO_WRITE)
+	if (NO_WRITE & (1 << host->SCpnt->device->id)) {
+	    printk(KERN_CRIT "scsi%d.%c: I can't handle DMA_OUT!\n",
+		    host->host->host_no, acornscsi_target(host));
+	    return;
+	}
+#endif
+	mode = DMAC_WRITE;
+    } else
+	mode = DMAC_READ;
+
+    /*
+     * Allocate some buffer space, limited to half the buffer size
+     */
+    length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2);
+    if (length) {
+	host->dma.start_addr = address = host->dma.free_addr;
+	host->dma.free_addr = (host->dma.free_addr + length) &
+				(DMAC_BUFFER_SIZE - 1);
+
+	/*
+	 * Transfer data to DMA memory
+	 */
+	if (direction == DMA_OUT)
+	    acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr,
+				length);
+
+	length -= 1;
+	dmac_write(host, DMAC_TXCNTLO, length);
+	dmac_write(host, DMAC_TXCNTHI, length >> 8);
+	dmac_write(host, DMAC_TXADRLO, address);
+	dmac_write(host, DMAC_TXADRMD, address >> 8);
+	dmac_write(host, DMAC_TXADRHI, 0);
+	dmac_write(host, DMAC_MODECON, mode);
+	dmac_write(host, DMAC_MASKREG, MASK_OFF);
+
+#if (DEBUG & DEBUG_DMA)
+	DBG(host->SCpnt, acornscsi_dumpdma(host, "strt"));
+#endif
+	host->dma.xfer_setup = 1;
+    }
+}
+
+/*
+ * Function: void acornscsi_dma_cleanup(AS_Host *host)
+ * Purpose : ensure that all DMA transfers are up-to-date & host->scsi.SCp is correct
+ * Params  : host - host to finish
+ * Notes   : This is called when a command is:
+ *		terminating, RESTORE_POINTERS, SAVE_POINTERS, DISCONNECT
+ *	   : This must not return until all transfers are completed.
+ */
+static
+void acornscsi_dma_cleanup(AS_Host *host)
+{
+    dmac_write(host, DMAC_MASKREG, MASK_ON);
+    dmac_clearintr(host);
+
+    /*
+     * Check for a pending transfer
+     */
+    if (host->dma.xfer_required) {
+	host->dma.xfer_required = 0;
+	if (host->dma.direction == DMA_IN)
+	    acornscsi_data_read(host, host->dma.xfer_ptr,
+				 host->dma.xfer_start, host->dma.xfer_length);
+    }
+
+    /*
+     * Has a transfer been setup?
+     */
+    if (host->dma.xfer_setup) {
+	unsigned int transferred;
+
+	host->dma.xfer_setup = 0;
+
+#if (DEBUG & DEBUG_DMA)
+	DBG(host->SCpnt, acornscsi_dumpdma(host, "cupi"));
+#endif
+
+	/*
+	 * Calculate number of bytes transferred from DMA.
+	 */
+	transferred = dmac_address(host) - host->dma.start_addr;
+	host->dma.transferred += transferred;
+
+	if (host->dma.direction == DMA_IN)
+	    acornscsi_data_read(host, host->scsi.SCp.ptr,
+				 host->dma.start_addr, transferred);
+
+	/*
+	 * Update SCSI pointers
+	 */
+	acornscsi_data_updateptr(host, &host->scsi.SCp, transferred);
+#if (DEBUG & DEBUG_DMA)
+	DBG(host->SCpnt, acornscsi_dumpdma(host, "cupo"));
+#endif
+    }
+}
+
+/*
+ * Function: void acornscsi_dmacintr(AS_Host *host)
+ * Purpose : handle interrupts from DMAC device
+ * Params  : host - host to process
+ * Notes   : If reading, we schedule the read to main memory &
+ *	     allow the transfer to continue.
+ *	   : If writing, we fill the onboard DMA memory from main
+ *	     memory.
+ *	   : Called whenever DMAC finished it's current transfer.
+ */
+static
+void acornscsi_dma_intr(AS_Host *host)
+{
+    unsigned int address, length, transferred;
+
+#if (DEBUG & DEBUG_DMA)
+    DBG(host->SCpnt, acornscsi_dumpdma(host, "inti"));
+#endif
+
+    dmac_write(host, DMAC_MASKREG, MASK_ON);
+    dmac_clearintr(host);
+
+    /*
+     * Calculate amount transferred via DMA
+     */
+    transferred = dmac_address(host) - host->dma.start_addr;
+    host->dma.transferred += transferred;
+
+    /*
+     * Schedule DMA transfer off board
+     */
+    if (host->dma.direction == DMA_IN) {
+	host->dma.xfer_start = host->dma.start_addr;
+	host->dma.xfer_length = transferred;
+	host->dma.xfer_ptr = host->scsi.SCp.ptr;
+	host->dma.xfer_required = 1;
+    }
+
+    acornscsi_data_updateptr(host, &host->scsi.SCp, transferred);
+
+    /*
+     * Allocate some buffer space, limited to half the on-board RAM size
+     */
+    length = min_t(unsigned int, host->scsi.SCp.this_residual, DMAC_BUFFER_SIZE / 2);
+    if (length) {
+	host->dma.start_addr = address = host->dma.free_addr;
+	host->dma.free_addr = (host->dma.free_addr + length) &
+				(DMAC_BUFFER_SIZE - 1);
+
+	/*
+	 * Transfer data to DMA memory
+	 */
+	if (host->dma.direction == DMA_OUT)
+	    acornscsi_data_write(host, host->scsi.SCp.ptr, host->dma.start_addr,
+				length);
+
+	length -= 1;
+	dmac_write(host, DMAC_TXCNTLO, length);
+	dmac_write(host, DMAC_TXCNTHI, length >> 8);
+	dmac_write(host, DMAC_TXADRLO, address);
+	dmac_write(host, DMAC_TXADRMD, address >> 8);
+	dmac_write(host, DMAC_TXADRHI, 0);
+	dmac_write(host, DMAC_MASKREG, MASK_OFF);
+
+#if (DEBUG & DEBUG_DMA)
+	DBG(host->SCpnt, acornscsi_dumpdma(host, "into"));
+#endif
+    } else {
+	host->dma.xfer_setup = 0;
+#if 0
+	/*
+	 * If the interface still wants more, then this is an error.
+	 * We give it another byte, but we also attempt to raise an
+	 * attention condition.  We continue giving one byte until
+	 * the device recognises the attention.
+	 */
+	if (dmac_read(host, DMAC_STATUS) & STATUS_RQ0) {
+	    acornscsi_abortcmd(host);
+
+	    dmac_write(host, DMAC_TXCNTLO, 0);
+	    dmac_write(host, DMAC_TXCNTHI, 0);
+	    dmac_write(host, DMAC_TXADRLO, 0);
+	    dmac_write(host, DMAC_TXADRMD, 0);
+	    dmac_write(host, DMAC_TXADRHI, 0);
+	    dmac_write(host, DMAC_MASKREG, MASK_OFF);
+	}
+#endif
+    }
+}
+
+/*
+ * Function: void acornscsi_dma_xfer(AS_Host *host)
+ * Purpose : transfer data between AcornSCSI and memory
+ * Params  : host - host to process
+ */
+static
+void acornscsi_dma_xfer(AS_Host *host)
+{
+    host->dma.xfer_required = 0;
+
+    if (host->dma.direction == DMA_IN)
+	acornscsi_data_read(host, host->dma.xfer_ptr,
+				host->dma.xfer_start, host->dma.xfer_length);
+}
+
+/*
+ * Function: void acornscsi_dma_adjust(AS_Host *host)
+ * Purpose : adjust DMA pointers & count for bytes transferred to
+ *	     SBIC but not SCSI bus.
+ * Params  : host - host to adjust DMA count for
+ */
+static
+void acornscsi_dma_adjust(AS_Host *host)
+{
+    if (host->dma.xfer_setup) {
+	signed long transferred;
+#if (DEBUG & (DEBUG_DMA|DEBUG_WRITE))
+	DBG(host->SCpnt, acornscsi_dumpdma(host, "adji"));
+#endif
+	/*
+	 * Calculate correct DMA address - DMA is ahead of SCSI bus while
+	 * writing.
+	 *  host->scsi.SCp.scsi_xferred is the number of bytes
+	 *  actually transferred to/from the SCSI bus.
+	 *  host->dma.transferred is the number of bytes transferred
+	 *  over DMA since host->dma.start_addr was last set.
+	 *
+	 * real_dma_addr = host->dma.start_addr + host->scsi.SCp.scsi_xferred
+	 *		   - host->dma.transferred
+	 */
+	transferred = host->scsi.SCp.scsi_xferred - host->dma.transferred;
+	if (transferred < 0)
+	    printk("scsi%d.%c: Ack! DMA write correction %ld < 0!\n",
+		    host->host->host_no, acornscsi_target(host), transferred);
+	else if (transferred == 0)
+	    host->dma.xfer_setup = 0;
+	else {
+	    transferred += host->dma.start_addr;
+	    dmac_write(host, DMAC_TXADRLO, transferred);
+	    dmac_write(host, DMAC_TXADRMD, transferred >> 8);
+	    dmac_write(host, DMAC_TXADRHI, transferred >> 16);
+#if (DEBUG & (DEBUG_DMA|DEBUG_WRITE))
+	    DBG(host->SCpnt, acornscsi_dumpdma(host, "adjo"));
+#endif
+	}
+    }
+}
+#endif
+
+/* =========================================================================================
+ * Data I/O
+ */
+static int
+acornscsi_write_pio(AS_Host *host, char *bytes, int *ptr, int len, unsigned int max_timeout)
+{
+	unsigned int asr, timeout = max_timeout;
+	int my_ptr = *ptr;
+
+	while (my_ptr < len) {
+		asr = sbic_arm_read(host, SBIC_ASR);
+
+		if (asr & ASR_DBR) {
+			timeout = max_timeout;
+
+			sbic_arm_write(host, SBIC_DATA, bytes[my_ptr++]);
+		} else if (asr & ASR_INT)
+			break;
+		else if (--timeout == 0)
+			break;
+		udelay(1);
+	}
+
+	*ptr = my_ptr;
+
+	return (timeout == 0) ? -1 : 0;
+}
+
+/*
+ * Function: void acornscsi_sendcommand(AS_Host *host)
+ * Purpose : send a command to a target
+ * Params  : host - host which is connected to target
+ */
+static void
+acornscsi_sendcommand(AS_Host *host)
+{
+	struct scsi_cmnd *SCpnt = host->SCpnt;
+
+    sbic_arm_write(host, SBIC_TRANSCNTH, 0);
+    sbic_arm_writenext(host, 0);
+    sbic_arm_writenext(host, SCpnt->cmd_len - host->scsi.SCp.sent_command);
+
+    acornscsi_sbic_issuecmd(host, CMND_XFERINFO);
+
+    if (acornscsi_write_pio(host, SCpnt->cmnd,
+	(int *)&host->scsi.SCp.sent_command, SCpnt->cmd_len, 1000000))
+	printk("scsi%d: timeout while sending command\n", host->host->host_no);
+
+    host->scsi.phase = PHASE_COMMAND;
+}
+
+static
+void acornscsi_sendmessage(AS_Host *host)
+{
+    unsigned int message_length = msgqueue_msglength(&host->scsi.msgs);
+    unsigned int msgnr;
+    struct message *msg;
+
+#if (DEBUG & DEBUG_MESSAGES)
+    printk("scsi%d.%c: sending message ",
+	    host->host->host_no, acornscsi_target(host));
+#endif
+
+    switch (message_length) {
+    case 0:
+	acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT);
+
+	acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 1");
+
+	sbic_arm_write(host, SBIC_DATA, NOP);
+
+	host->scsi.last_message = NOP;
+#if (DEBUG & DEBUG_MESSAGES)
+	printk("NOP");
+#endif
+	break;
+
+    case 1:
+	acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT);
+	msg = msgqueue_getmsg(&host->scsi.msgs, 0);
+
+	acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "sending message 2");
+
+	sbic_arm_write(host, SBIC_DATA, msg->msg[0]);
+
+	host->scsi.last_message = msg->msg[0];
+#if (DEBUG & DEBUG_MESSAGES)
+	spi_print_msg(msg->msg);
+#endif
+	break;
+
+    default:
+	/*
+	 * ANSI standard says: (SCSI-2 Rev 10c Sect 5.6.14)
+	 * 'When a target sends this (MESSAGE_REJECT) message, it
+	 *  shall change to MESSAGE IN phase and send this message
+	 *  prior to requesting additional message bytes from the
+	 *  initiator.  This provides an interlock so that the
+	 *  initiator can determine which message byte is rejected.
+	 */
+	sbic_arm_write(host, SBIC_TRANSCNTH, 0);
+	sbic_arm_writenext(host, 0);
+	sbic_arm_writenext(host, message_length);
+	acornscsi_sbic_issuecmd(host, CMND_XFERINFO);
+
+	msgnr = 0;
+	while ((msg = msgqueue_getmsg(&host->scsi.msgs, msgnr++)) != NULL) {
+	    unsigned int i;
+#if (DEBUG & DEBUG_MESSAGES)
+	    spi_print_msg(msg);
+#endif
+	    i = 0;
+	    if (acornscsi_write_pio(host, msg->msg, &i, msg->length, 1000000))
+		printk("scsi%d: timeout while sending message\n", host->host->host_no);
+
+	    host->scsi.last_message = msg->msg[0];
+	    if (msg->msg[0] == EXTENDED_MESSAGE)
+		host->scsi.last_message |= msg->msg[2] << 8;
+
+	    if (i != msg->length)
+		break;
+	}
+	break;
+    }
+#if (DEBUG & DEBUG_MESSAGES)
+    printk("\n");
+#endif
+}
+
+/*
+ * Function: void acornscsi_readstatusbyte(AS_Host *host)
+ * Purpose : Read status byte from connected target
+ * Params  : host - host connected to target
+ */
+static
+void acornscsi_readstatusbyte(AS_Host *host)
+{
+    acornscsi_sbic_issuecmd(host, CMND_XFERINFO|CMND_SBT);
+    acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "reading status byte");
+    host->scsi.SCp.Status = sbic_arm_read(host, SBIC_DATA);
+}
+
+/*
+ * Function: unsigned char acornscsi_readmessagebyte(AS_Host *host)
+ * Purpose : Read one message byte from connected target
+ * Params  : host - host connected to target
+ */
+static
+unsigned char acornscsi_readmessagebyte(AS_Host *host)
+{
+    unsigned char message;
+
+    acornscsi_sbic_issuecmd(host, CMND_XFERINFO | CMND_SBT);
+
+    acornscsi_sbic_wait(host, ASR_DBR, ASR_DBR, 1000, "for message byte");
+
+    message = sbic_arm_read(host, SBIC_DATA);
+
+    /* wait for MSGIN-XFER-PAUSED */
+    acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after message byte");
+
+    sbic_arm_read(host, SBIC_SSR);
+
+    return message;
+}
+
+/*
+ * Function: void acornscsi_message(AS_Host *host)
+ * Purpose : Read complete message from connected target & action message
+ * Params  : host - host connected to target
+ */
+static
+void acornscsi_message(AS_Host *host)
+{
+    struct scsi_pointer *scsi_pointer;
+    unsigned char message[16];
+    unsigned int msgidx = 0, msglen = 1;
+
+    do {
+	message[msgidx] = acornscsi_readmessagebyte(host);
+
+	switch (msgidx) {
+	case 0:
+	    if (message[0] == EXTENDED_MESSAGE ||
+		(message[0] >= 0x20 && message[0] <= 0x2f))
+		msglen = 2;
+	    break;
+
+	case 1:
+	    if (message[0] == EXTENDED_MESSAGE)
+		msglen += message[msgidx];
+	    break;
+	}
+	msgidx += 1;
+	if (msgidx < msglen) {
+	    acornscsi_sbic_issuecmd(host, CMND_NEGATEACK);
+
+	    /* wait for next msg-in */
+	    acornscsi_sbic_wait(host, ASR_INT, ASR_INT, 1000, "for interrupt after negate ack");
+	    sbic_arm_read(host, SBIC_SSR);
+	}
+    } while (msgidx < msglen);
+
+#if (DEBUG & DEBUG_MESSAGES)
+    printk("scsi%d.%c: message in: ",
+	    host->host->host_no, acornscsi_target(host));
+    spi_print_msg(message);
+    printk("\n");
+#endif
+
+    if (host->scsi.phase == PHASE_RECONNECTED) {
+	/*
+	 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.17)
+	 * 'Whenever a target reconnects to an initiator to continue
+	 *  a tagged I/O process, the SIMPLE QUEUE TAG message shall
+	 *  be sent immediately following the IDENTIFY message...'
+	 */
+	if (message[0] == SIMPLE_QUEUE_TAG)
+	    host->scsi.reconnected.tag = message[1];
+	if (acornscsi_reconnect_finish(host))
+	    host->scsi.phase = PHASE_MSGIN;
+    }
+
+    switch (message[0]) {
+    case ABORT_TASK_SET:
+    case ABORT_TASK:
+    case COMMAND_COMPLETE:
+	if (host->scsi.phase != PHASE_STATUSIN) {
+	    printk(KERN_ERR "scsi%d.%c: command complete following non-status in phase?\n",
+		    host->host->host_no, acornscsi_target(host));
+	    acornscsi_dumplog(host, host->SCpnt->device->id);
+	}
+	host->scsi.phase = PHASE_DONE;
+	host->scsi.SCp.Message = message[0];
+	break;
+
+    case SAVE_POINTERS:
+	/*
+	 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.20)
+	 * 'The SAVE DATA POINTER message is sent from a target to
+	 *  direct the initiator to copy the active data pointer to
+	 *  the saved data pointer for the current I/O process.
+	 */
+	acornscsi_dma_cleanup(host);
+	scsi_pointer = arm_scsi_pointer(host->SCpnt);
+	*scsi_pointer = host->scsi.SCp;
+	scsi_pointer->sent_command = 0;
+	host->scsi.phase = PHASE_MSGIN;
+	break;
+
+    case RESTORE_POINTERS:
+	/*
+	 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 5.6.19)
+	 * 'The RESTORE POINTERS message is sent from a target to
+	 *  direct the initiator to copy the most recently saved
+	 *  command, data, and status pointers for the I/O process
+	 *  to the corresponding active pointers.  The command and
+	 *  status pointers shall be restored to the beginning of
+	 *  the present command and status areas.'
+	 */
+	acornscsi_dma_cleanup(host);
+	host->scsi.SCp = *arm_scsi_pointer(host->SCpnt);
+	host->scsi.phase = PHASE_MSGIN;
+	break;
+
+    case DISCONNECT:
+	/*
+	 * ANSI standard says: (Section SCSI-2 Rev. 10c Sect 6.4.2)
+	 * 'On those occasions when an error or exception condition occurs
+	 *  and the target elects to repeat the information transfer, the
+	 *  target may repeat the transfer either issuing a RESTORE POINTERS
+	 *  message or by disconnecting without issuing a SAVE POINTERS
+	 *  message.  When reconnection is completed, the most recent
+	 *  saved pointer values are restored.'
+	 */
+	acornscsi_dma_cleanup(host);
+	host->scsi.phase = PHASE_DISCONNECT;
+	break;
+
+    case MESSAGE_REJECT:
+#if 0 /* this isn't needed any more */
+	/*
+	 * If we were negociating sync transfer, we don't yet know if
+	 * this REJECT is for the sync transfer or for the tagged queue/wide
+	 * transfer.  Re-initiate sync transfer negotiation now, and if
+	 * we got a REJECT in response to SDTR, then it'll be set to DONE.
+	 */
+	if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST)
+	    host->device[host->SCpnt->device->id].sync_state = SYNC_NEGOCIATE;
+#endif
+
+	/*
+	 * If we have any messages waiting to go out, then assert ATN now
+	 */
+	if (msgqueue_msglength(&host->scsi.msgs))
+	    acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
+
+	switch (host->scsi.last_message) {
+	case EXTENDED_MESSAGE | (EXTENDED_SDTR << 8):
+	    /*
+	     * Target can't handle synchronous transfers
+	     */
+	    printk(KERN_NOTICE "scsi%d.%c: Using asynchronous transfer\n",
+		    host->host->host_no, acornscsi_target(host));
+	    host->device[host->SCpnt->device->id].sync_xfer = SYNCHTRANSFER_2DBA;
+	    host->device[host->SCpnt->device->id].sync_state = SYNC_ASYNCHRONOUS;
+	    sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer);
+	    break;
+
+	default:
+	    break;
+	}
+	break;
+
+    case SIMPLE_QUEUE_TAG:
+	/* tag queue reconnect... message[1] = queue tag.  Print something to indicate something happened! */
+	printk("scsi%d.%c: reconnect queue tag %02X\n",
+		host->host->host_no, acornscsi_target(host),
+		message[1]);
+	break;
+
+    case EXTENDED_MESSAGE:
+	switch (message[2]) {
+#ifdef CONFIG_SCSI_ACORNSCSI_SYNC
+	case EXTENDED_SDTR:
+	    if (host->device[host->SCpnt->device->id].sync_state == SYNC_SENT_REQUEST) {
+		/*
+		 * We requested synchronous transfers.  This isn't quite right...
+		 * We can only say if this succeeded if we proceed on to execute the
+		 * command from this message.  If we get a MESSAGE PARITY ERROR,
+		 * and the target retries fail, then we fallback to asynchronous mode
+		 */
+		host->device[host->SCpnt->device->id].sync_state = SYNC_COMPLETED;
+		printk(KERN_NOTICE "scsi%d.%c: Using synchronous transfer, offset %d, %d ns\n",
+			host->host->host_no, acornscsi_target(host),
+			message[4], message[3] * 4);
+		host->device[host->SCpnt->device->id].sync_xfer =
+			calc_sync_xfer(message[3] * 4, message[4]);
+	    } else {
+		unsigned char period, length;
+		/*
+		 * Target requested synchronous transfers.  The agreement is only
+		 * to be in operation AFTER the target leaves message out phase.
+		 */
+		acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
+		period = max_t(unsigned int, message[3], sdtr_period / 4);
+		length = min_t(unsigned int, message[4], sdtr_size);
+		msgqueue_addmsg(&host->scsi.msgs, 5, EXTENDED_MESSAGE, 3,
+				 EXTENDED_SDTR, period, length);
+		host->device[host->SCpnt->device->id].sync_xfer =
+			calc_sync_xfer(period * 4, length);
+	    }
+	    sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer);
+	    break;
+#else
+	    /* We do not accept synchronous transfers.  Respond with a
+	     * MESSAGE_REJECT.
+	     */
+#endif
+
+	case EXTENDED_WDTR:
+	    /* The WD33C93A is only 8-bit.  We respond with a MESSAGE_REJECT
+	     * to a wide data transfer request.
+	     */
+	default:
+	    acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
+	    msgqueue_flush(&host->scsi.msgs);
+	    msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT);
+	    break;
+	}
+	break;
+
+    default: /* reject message */
+	printk(KERN_ERR "scsi%d.%c: unrecognised message %02X, rejecting\n",
+		host->host->host_no, acornscsi_target(host),
+		message[0]);
+	acornscsi_sbic_issuecmd(host, CMND_ASSERTATN);
+	msgqueue_flush(&host->scsi.msgs);
+	msgqueue_addmsg(&host->scsi.msgs, 1, MESSAGE_REJECT);
+	host->scsi.phase = PHASE_MSGIN;
+	break;
+    }
+    acornscsi_sbic_issuecmd(host, CMND_NEGATEACK);
+}
+
+/*
+ * Function: int acornscsi_buildmessages(AS_Host *host)
+ * Purpose : build the connection messages for a host
+ * Params  : host - host to add messages to
+ */
+static
+void acornscsi_buildmessages(AS_Host *host)
+{
+#if 0
+    /* does the device need resetting? */
+    if (cmd_reset) {
+	msgqueue_addmsg(&host->scsi.msgs, 1, BUS_DEVICE_RESET);
+	return;
+    }
+#endif
+
+    msgqueue_addmsg(&host->scsi.msgs, 1,
+		     IDENTIFY(host->device[host->SCpnt->device->id].disconnect_ok,
+			     host->SCpnt->device->lun));
+
+#if 0
+    /* does the device need the current command aborted */
+    if (cmd_aborted) {
+	acornscsi_abortcmd(host);
+	return;
+    }
+#endif
+
+
+#ifdef CONFIG_SCSI_ACORNSCSI_SYNC
+    if (host->device[host->SCpnt->device->id].sync_state == SYNC_NEGOCIATE) {
+	host->device[host->SCpnt->device->id].sync_state = SYNC_SENT_REQUEST;
+	msgqueue_addmsg(&host->scsi.msgs, 5,
+			 EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
+			 sdtr_period / 4, sdtr_size);
+    }
+#endif
+}
+
+/*
+ * Function: int acornscsi_starttransfer(AS_Host *host)
+ * Purpose : transfer data to/from connected target
+ * Params  : host - host to which target is connected
+ * Returns : 0 if failure
+ */
+static
+int acornscsi_starttransfer(AS_Host *host)
+{
+    int residual;
+
+    if (!host->scsi.SCp.ptr /*&& host->scsi.SCp.this_residual*/) {
+	printk(KERN_ERR "scsi%d.%c: null buffer passed to acornscsi_starttransfer\n",
+		host->host->host_no, acornscsi_target(host));
+	return 0;
+    }
+
+    residual = scsi_bufflen(host->SCpnt) - host->scsi.SCp.scsi_xferred;
+
+    sbic_arm_write(host, SBIC_SYNCHTRANSFER, host->device[host->SCpnt->device->id].sync_xfer);
+    sbic_arm_writenext(host, residual >> 16);
+    sbic_arm_writenext(host, residual >> 8);
+    sbic_arm_writenext(host, residual);
+    acornscsi_sbic_issuecmd(host, CMND_XFERINFO);
+    return 1;
+}
+
+/* =========================================================================================
+ * Connection & Disconnection
+ */
+/*
+ * Function : acornscsi_reconnect(AS_Host *host)
+ * Purpose  : reconnect a previously disconnected command
+ * Params   : host - host specific data
+ * Remarks  : SCSI spec says:
+ *		'The set of active pointers is restored from the set
+ *		 of saved pointers upon reconnection of the I/O process'
+ */
+static
+int acornscsi_reconnect(AS_Host *host)
+{
+    unsigned int target, lun, ok = 0;
+
+    target = sbic_arm_read(host, SBIC_SOURCEID);
+
+    if (!(target & 8))
+	printk(KERN_ERR "scsi%d: invalid source id after reselection "
+		"- device fault?\n",
+		host->host->host_no);
+
+    target &= 7;
+
+    if (host->SCpnt && !host->scsi.disconnectable) {
+	printk(KERN_ERR "scsi%d.%d: reconnected while command in "
+		"progress to target %d?\n",
+		host->host->host_no, target, host->SCpnt->device->id);
+	host->SCpnt = NULL;
+    }
+
+    lun = sbic_arm_read(host, SBIC_DATA) & 7;
+
+    host->scsi.reconnected.target = target;
+    host->scsi.reconnected.lun = lun;
+    host->scsi.reconnected.tag = 0;
+
+    if (host->scsi.disconnectable && host->SCpnt &&
+	host->SCpnt->device->id == target && host->SCpnt->device->lun == lun)
+	ok = 1;
+
+    if (!ok && queue_probetgtlun(&host->queues.disconnected, target, lun))
+	ok = 1;
+
+    ADD_STATUS(target, 0x81, host->scsi.phase, 0);
+
+    if (ok) {
+	host->scsi.phase = PHASE_RECONNECTED;
+    } else {
+	/* this doesn't seem to work */
+	printk(KERN_ERR "scsi%d.%c: reselected with no command "
+		"to reconnect with\n",
+		host->host->host_no, '0' + target);
+	acornscsi_dumplog(host, target);
+	acornscsi_abortcmd(host);
+	if (host->SCpnt) {
+	    queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt);
+	    host->SCpnt = NULL;
+	}
+    }
+    acornscsi_sbic_issuecmd(host, CMND_NEGATEACK);
+    return !ok;
+}
+
+/*
+ * Function: int acornscsi_reconnect_finish(AS_Host *host)
+ * Purpose : finish reconnecting a command
+ * Params  : host - host to complete
+ * Returns : 0 if failed
+ */
+static
+int acornscsi_reconnect_finish(AS_Host *host)
+{
+    if (host->scsi.disconnectable && host->SCpnt) {
+	host->scsi.disconnectable = 0;
+	if (host->SCpnt->device->id  == host->scsi.reconnected.target &&
+	    host->SCpnt->device->lun == host->scsi.reconnected.lun &&
+	    scsi_cmd_to_rq(host->SCpnt)->tag == host->scsi.reconnected.tag) {
+#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
+	    DBG(host->SCpnt, printk("scsi%d.%c: reconnected",
+		    host->host->host_no, acornscsi_target(host)));
+#endif
+	} else {
+	    queue_add_cmd_tail(&host->queues.disconnected, host->SCpnt);
+#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
+	    DBG(host->SCpnt, printk("scsi%d.%c: had to move command "
+		    "to disconnected queue\n",
+		    host->host->host_no, acornscsi_target(host)));
+#endif
+	    host->SCpnt = NULL;
+	}
+    }
+    if (!host->SCpnt) {
+	host->SCpnt = queue_remove_tgtluntag(&host->queues.disconnected,
+				host->scsi.reconnected.target,
+				host->scsi.reconnected.lun,
+				host->scsi.reconnected.tag);
+#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
+	DBG(host->SCpnt, printk("scsi%d.%c: had to get command",
+		host->host->host_no, acornscsi_target(host)));
+#endif
+    }
+
+    if (!host->SCpnt)
+	acornscsi_abortcmd(host);
+    else {
+	/*
+	 * Restore data pointer from SAVED pointers.
+	 */
+	host->scsi.SCp = *arm_scsi_pointer(host->SCpnt);
+#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
+	printk(", data pointers: [%p, %X]",
+		host->scsi.SCp.ptr, host->scsi.SCp.this_residual);
+#endif
+    }
+#if (DEBUG & (DEBUG_QUEUES|DEBUG_DISCON))
+    printk("\n");
+#endif
+
+    host->dma.transferred = host->scsi.SCp.scsi_xferred;
+
+    return host->SCpnt != NULL;
+}
+
+/*
+ * Function: void acornscsi_disconnect_unexpected(AS_Host *host)
+ * Purpose : handle an unexpected disconnect
+ * Params  : host - host on which disconnect occurred
+ */
+static
+void acornscsi_disconnect_unexpected(AS_Host *host)
+{
+    printk(KERN_ERR "scsi%d.%c: unexpected disconnect\n",
+	    host->host->host_no, acornscsi_target(host));
+#if (DEBUG & DEBUG_ABORT)
+    acornscsi_dumplog(host, 8);
+#endif
+
+    acornscsi_done(host, &host->SCpnt, DID_ERROR);
+}
+
+/*
+ * Function: void acornscsi_abortcmd(AS_host *host, unsigned char tag)
+ * Purpose : abort a currently executing command
+ * Params  : host - host with connected command to abort
+ */
+static
+void acornscsi_abortcmd(AS_Host *host)
+{
+    host->scsi.phase = PHASE_ABORTED;
+    sbic_arm_write(host, SBIC_CMND, CMND_ASSERTATN);
+
+    msgqueue_flush(&host->scsi.msgs);
+    msgqueue_addmsg(&host->scsi.msgs, 1, ABORT);
+}
+
+/* ==========================================================================================
+ * Interrupt routines.
+ */
+/*
+ * Function: int acornscsi_sbicintr(AS_Host *host)
+ * Purpose : handle interrupts from SCSI device
+ * Params  : host - host to process
+ * Returns : INTR_PROCESS if expecting another SBIC interrupt
+ *	     INTR_IDLE if no interrupt
+ *	     INTR_NEXT_COMMAND if we have finished processing the command
+ */
+static
+intr_ret_t acornscsi_sbicintr(AS_Host *host, int in_irq)
+{
+    unsigned int asr, ssr;
+
+    asr = sbic_arm_read(host, SBIC_ASR);
+    if (!(asr & ASR_INT))
+	return INTR_IDLE;
+
+    ssr = sbic_arm_read(host, SBIC_SSR);
+
+#if (DEBUG & DEBUG_PHASES)
+    print_sbic_status(asr, ssr, host->scsi.phase);
+#endif
+
+    ADD_STATUS(8, ssr, host->scsi.phase, in_irq);
+
+    if (host->SCpnt && !host->scsi.disconnectable)
+	ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq);
+
+    switch (ssr) {
+    case 0x00:				/* reset state - not advanced			*/
+	printk(KERN_ERR "scsi%d: reset in standard mode but wanted advanced mode.\n",
+		host->host->host_no);
+	/* setup sbic - WD33C93A */
+	sbic_arm_write(host, SBIC_OWNID, OWNID_EAF | host->host->this_id);
+	sbic_arm_write(host, SBIC_CMND, CMND_RESET);
+	return INTR_IDLE;
+
+    case 0x01:				/* reset state - advanced			*/
+	sbic_arm_write(host, SBIC_CTRL, INIT_SBICDMA | CTRL_IDI);
+	sbic_arm_write(host, SBIC_TIMEOUT, TIMEOUT_TIME);
+	sbic_arm_write(host, SBIC_SYNCHTRANSFER, SYNCHTRANSFER_2DBA);
+	sbic_arm_write(host, SBIC_SOURCEID, SOURCEID_ER | SOURCEID_DSP);
+	msgqueue_flush(&host->scsi.msgs);
+	return INTR_IDLE;
+
+    case 0x41:				/* unexpected disconnect aborted command	*/
+	acornscsi_disconnect_unexpected(host);
+	return INTR_NEXT_COMMAND;
+    }
+
+    switch (host->scsi.phase) {
+    case PHASE_CONNECTING:		/* STATE: command removed from issue queue	*/
+	switch (ssr) {
+	case 0x11:			/* -> PHASE_CONNECTED				*/
+	    /* BUS FREE -> SELECTION */
+	    host->scsi.phase = PHASE_CONNECTED;
+	    msgqueue_flush(&host->scsi.msgs);
+	    host->dma.transferred = host->scsi.SCp.scsi_xferred;
+	    /* 33C93 gives next interrupt indicating bus phase */
+	    asr = sbic_arm_read(host, SBIC_ASR);
+	    if (!(asr & ASR_INT))
+		break;
+	    ssr = sbic_arm_read(host, SBIC_SSR);
+	    ADD_STATUS(8, ssr, host->scsi.phase, 1);
+	    ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, 1);
+	    goto connected;
+	    
+	case 0x42:			/* select timed out				*/
+					/* -> PHASE_IDLE				*/
+	    acornscsi_done(host, &host->SCpnt, DID_NO_CONNECT);
+	    return INTR_NEXT_COMMAND;
+
+	case 0x81:			/* -> PHASE_RECONNECTED or PHASE_ABORTED	*/
+	    /* BUS FREE -> RESELECTION */
+	    host->origSCpnt = host->SCpnt;
+	    host->SCpnt = NULL;
+	    msgqueue_flush(&host->scsi.msgs);
+	    acornscsi_reconnect(host);
+	    break;
+
+	default:
+	    printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTING, SSR %02X?\n",
+		    host->host->host_no, acornscsi_target(host), ssr);
+	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
+	    acornscsi_abortcmd(host);
+	}
+	return INTR_PROCESSING;
+
+    connected:
+    case PHASE_CONNECTED:		/* STATE: device selected ok			*/
+	switch (ssr) {
+#ifdef NONSTANDARD
+	case 0x8a:			/* -> PHASE_COMMAND, PHASE_COMMANDPAUSED	*/
+	    /* SELECTION -> COMMAND */
+	    acornscsi_sendcommand(host);
+	    break;
+
+	case 0x8b:			/* -> PHASE_STATUS				*/
+	    /* SELECTION -> STATUS */
+	    acornscsi_readstatusbyte(host);
+	    host->scsi.phase = PHASE_STATUSIN;
+	    break;
+#endif
+
+	case 0x8e:			/* -> PHASE_MSGOUT				*/
+	    /* SELECTION ->MESSAGE OUT */
+	    host->scsi.phase = PHASE_MSGOUT;
+	    acornscsi_buildmessages(host);
+	    acornscsi_sendmessage(host);
+	    break;
+
+	/* these should not happen */
+	case 0x85:			/* target disconnected				*/
+	    acornscsi_done(host, &host->SCpnt, DID_ERROR);
+	    break;
+
+	default:
+	    printk(KERN_ERR "scsi%d.%c: PHASE_CONNECTED, SSR %02X?\n",
+		    host->host->host_no, acornscsi_target(host), ssr);
+	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
+	    acornscsi_abortcmd(host);
+	}
+	return INTR_PROCESSING;
+
+    case PHASE_MSGOUT:			/* STATE: connected & sent IDENTIFY message	*/
+	/*
+	 * SCSI standard says that MESSAGE OUT phases can be followed by a
+	 * DATA phase, STATUS phase, MESSAGE IN phase or COMMAND phase
+	 */
+	switch (ssr) {
+	case 0x8a:			/* -> PHASE_COMMAND, PHASE_COMMANDPAUSED	*/
+	case 0x1a:			/* -> PHASE_COMMAND, PHASE_COMMANDPAUSED	*/
+	    /* MESSAGE OUT -> COMMAND */
+	    acornscsi_sendcommand(host);
+	    break;
+
+	case 0x8b:			/* -> PHASE_STATUS				*/
+	case 0x1b:			/* -> PHASE_STATUS				*/
+	    /* MESSAGE OUT -> STATUS */
+	    acornscsi_readstatusbyte(host);
+	    host->scsi.phase = PHASE_STATUSIN;
+	    break;
+
+	case 0x8e:			/* -> PHASE_MSGOUT				*/
+	    /* MESSAGE_OUT(MESSAGE_IN) ->MESSAGE OUT */
+	    acornscsi_sendmessage(host);
+	    break;
+
+	case 0x4f:			/* -> PHASE_MSGIN, PHASE_DISCONNECT		*/
+	case 0x1f:			/* -> PHASE_MSGIN, PHASE_DISCONNECT		*/
+	    /* MESSAGE OUT -> MESSAGE IN */
+	    acornscsi_message(host);
+	    break;
+
+	default:
+	    printk(KERN_ERR "scsi%d.%c: PHASE_MSGOUT, SSR %02X?\n",
+		    host->host->host_no, acornscsi_target(host), ssr);
+	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
+	}
+	return INTR_PROCESSING;
+
+    case PHASE_COMMAND: 		/* STATE: connected & command sent		*/
+	switch (ssr) {
+	case 0x18:			/* -> PHASE_DATAOUT				*/
+	    /* COMMAND -> DATA OUT */
+	    if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len)
+		acornscsi_abortcmd(host);
+	    acornscsi_dma_setup(host, DMA_OUT);
+	    if (!acornscsi_starttransfer(host))
+		acornscsi_abortcmd(host);
+	    host->scsi.phase = PHASE_DATAOUT;
+	    return INTR_IDLE;
+
+	case 0x19:			/* -> PHASE_DATAIN				*/
+	    /* COMMAND -> DATA IN */
+	    if (host->scsi.SCp.sent_command != host->SCpnt->cmd_len)
+		acornscsi_abortcmd(host);
+	    acornscsi_dma_setup(host, DMA_IN);
+	    if (!acornscsi_starttransfer(host))
+		acornscsi_abortcmd(host);
+	    host->scsi.phase = PHASE_DATAIN;
+	    return INTR_IDLE;
+
+	case 0x1b:			/* -> PHASE_STATUS				*/
+	    /* COMMAND -> STATUS */
+	    acornscsi_readstatusbyte(host);
+	    host->scsi.phase = PHASE_STATUSIN;
+	    break;
+
+	case 0x1e:			/* -> PHASE_MSGOUT				*/
+	    /* COMMAND -> MESSAGE OUT */
+	    acornscsi_sendmessage(host);
+	    break;
+
+	case 0x1f:			/* -> PHASE_MSGIN, PHASE_DISCONNECT		*/
+	    /* COMMAND -> MESSAGE IN */
+	    acornscsi_message(host);
+	    break;
+
+	default:
+	    printk(KERN_ERR "scsi%d.%c: PHASE_COMMAND, SSR %02X?\n",
+		    host->host->host_no, acornscsi_target(host), ssr);
+	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
+	}
+	return INTR_PROCESSING;
+
+    case PHASE_DISCONNECT:		/* STATE: connected, received DISCONNECT msg	*/
+	if (ssr == 0x85) {		/* -> PHASE_IDLE				*/
+	    host->scsi.disconnectable = 1;
+	    host->scsi.reconnected.tag = 0;
+	    host->scsi.phase = PHASE_IDLE;
+	    host->stats.disconnects += 1;
+	} else {
+	    printk(KERN_ERR "scsi%d.%c: PHASE_DISCONNECT, SSR %02X instead of disconnect?\n",
+		    host->host->host_no, acornscsi_target(host), ssr);
+	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
+	}
+	return INTR_NEXT_COMMAND;
+
+    case PHASE_IDLE:			/* STATE: disconnected				*/
+	if (ssr == 0x81)		/* -> PHASE_RECONNECTED or PHASE_ABORTED	*/
+	    acornscsi_reconnect(host);
+	else {
+	    printk(KERN_ERR "scsi%d.%c: PHASE_IDLE, SSR %02X while idle?\n",
+		    host->host->host_no, acornscsi_target(host), ssr);
+	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
+	}
+	return INTR_PROCESSING;
+
+    case PHASE_RECONNECTED:		/* STATE: device reconnected to initiator	*/
+	/*
+	 * Command reconnected - if MESGIN, get message - it may be
+	 * the tag.  If not, get command out of disconnected queue
+	 */
+	/*
+	 * If we reconnected and we're not in MESSAGE IN phase after IDENTIFY,
+	 * reconnect I_T_L command
+	 */
+	if (ssr != 0x8f && !acornscsi_reconnect_finish(host))
+	    return INTR_IDLE;
+	ADD_STATUS(host->SCpnt->device->id, ssr, host->scsi.phase, in_irq);
+	switch (ssr) {
+	case 0x88:			/* data out phase				*/
+					/* -> PHASE_DATAOUT				*/
+	    /* MESSAGE IN -> DATA OUT */
+	    acornscsi_dma_setup(host, DMA_OUT);
+	    if (!acornscsi_starttransfer(host))
+		acornscsi_abortcmd(host);
+	    host->scsi.phase = PHASE_DATAOUT;
+	    return INTR_IDLE;
+
+	case 0x89:			/* data in phase				*/
+					/* -> PHASE_DATAIN				*/
+	    /* MESSAGE IN -> DATA IN */
+	    acornscsi_dma_setup(host, DMA_IN);
+	    if (!acornscsi_starttransfer(host))
+		acornscsi_abortcmd(host);
+	    host->scsi.phase = PHASE_DATAIN;
+	    return INTR_IDLE;
+
+	case 0x8a:			/* command out					*/
+	    /* MESSAGE IN -> COMMAND */
+	    acornscsi_sendcommand(host);/* -> PHASE_COMMAND, PHASE_COMMANDPAUSED	*/
+	    break;
+
+	case 0x8b:			/* status in					*/
+					/* -> PHASE_STATUSIN				*/
+	    /* MESSAGE IN -> STATUS */
+	    acornscsi_readstatusbyte(host);
+	    host->scsi.phase = PHASE_STATUSIN;
+	    break;
+
+	case 0x8e:			/* message out					*/
+					/* -> PHASE_MSGOUT				*/
+	    /* MESSAGE IN -> MESSAGE OUT */
+	    acornscsi_sendmessage(host);
+	    break;
+
+	case 0x8f:			/* message in					*/
+	    acornscsi_message(host);	/* -> PHASE_MSGIN, PHASE_DISCONNECT		*/
+	    break;
+
+	default:
+	    printk(KERN_ERR "scsi%d.%c: PHASE_RECONNECTED, SSR %02X after reconnect?\n",
+		    host->host->host_no, acornscsi_target(host), ssr);
+	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
+	}
+	return INTR_PROCESSING;
+
+    case PHASE_DATAIN:			/* STATE: transferred data in			*/
+	/*
+	 * This is simple - if we disconnect then the DMA address & count is
+	 * correct.
+	 */
+	switch (ssr) {
+	case 0x19:			/* -> PHASE_DATAIN				*/
+	case 0x89:			/* -> PHASE_DATAIN				*/
+	    acornscsi_abortcmd(host);
+	    return INTR_IDLE;
+
+	case 0x1b:			/* -> PHASE_STATUSIN				*/
+	case 0x4b:			/* -> PHASE_STATUSIN				*/
+	case 0x8b:			/* -> PHASE_STATUSIN				*/
+	    /* DATA IN -> STATUS */
+	    host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
+					  acornscsi_sbic_xfcount(host);
+	    acornscsi_dma_stop(host);
+	    acornscsi_readstatusbyte(host);
+	    host->scsi.phase = PHASE_STATUSIN;
+	    break;
+
+	case 0x1e:			/* -> PHASE_MSGOUT				*/
+	case 0x4e:			/* -> PHASE_MSGOUT				*/
+	case 0x8e:			/* -> PHASE_MSGOUT				*/
+	    /* DATA IN -> MESSAGE OUT */
+	    host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
+					  acornscsi_sbic_xfcount(host);
+	    acornscsi_dma_stop(host);
+	    acornscsi_sendmessage(host);
+	    break;
+
+	case 0x1f:			/* message in					*/
+	case 0x4f:			/* message in					*/
+	case 0x8f:			/* message in					*/
+	    /* DATA IN -> MESSAGE IN */
+	    host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
+					  acornscsi_sbic_xfcount(host);
+	    acornscsi_dma_stop(host);
+	    acornscsi_message(host);	/* -> PHASE_MSGIN, PHASE_DISCONNECT		*/
+	    break;
+
+	default:
+	    printk(KERN_ERR "scsi%d.%c: PHASE_DATAIN, SSR %02X?\n",
+		    host->host->host_no, acornscsi_target(host), ssr);
+	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
+	}
+	return INTR_PROCESSING;
+
+    case PHASE_DATAOUT: 		/* STATE: transferred data out			*/
+	/*
+	 * This is more complicated - if we disconnect, the DMA could be 12
+	 * bytes ahead of us.  We need to correct this.
+	 */
+	switch (ssr) {
+	case 0x18:			/* -> PHASE_DATAOUT				*/
+	case 0x88:			/* -> PHASE_DATAOUT				*/
+	    acornscsi_abortcmd(host);
+	    return INTR_IDLE;
+
+	case 0x1b:			/* -> PHASE_STATUSIN				*/
+	case 0x4b:			/* -> PHASE_STATUSIN				*/
+	case 0x8b:			/* -> PHASE_STATUSIN				*/
+	    /* DATA OUT -> STATUS */
+	    host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
+					  acornscsi_sbic_xfcount(host);
+	    acornscsi_dma_stop(host);
+	    acornscsi_dma_adjust(host);
+	    acornscsi_readstatusbyte(host);
+	    host->scsi.phase = PHASE_STATUSIN;
+	    break;
+
+	case 0x1e:			/* -> PHASE_MSGOUT				*/
+	case 0x4e:			/* -> PHASE_MSGOUT				*/
+	case 0x8e:			/* -> PHASE_MSGOUT				*/
+	    /* DATA OUT -> MESSAGE OUT */
+	    host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
+					  acornscsi_sbic_xfcount(host);
+	    acornscsi_dma_stop(host);
+	    acornscsi_dma_adjust(host);
+	    acornscsi_sendmessage(host);
+	    break;
+
+	case 0x1f:			/* message in					*/
+	case 0x4f:			/* message in					*/
+	case 0x8f:			/* message in					*/
+	    /* DATA OUT -> MESSAGE IN */
+	    host->scsi.SCp.scsi_xferred = scsi_bufflen(host->SCpnt) -
+					  acornscsi_sbic_xfcount(host);
+	    acornscsi_dma_stop(host);
+	    acornscsi_dma_adjust(host);
+	    acornscsi_message(host);	/* -> PHASE_MSGIN, PHASE_DISCONNECT		*/
+	    break;
+
+	default:
+	    printk(KERN_ERR "scsi%d.%c: PHASE_DATAOUT, SSR %02X?\n",
+		    host->host->host_no, acornscsi_target(host), ssr);
+	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
+	}
+	return INTR_PROCESSING;
+
+    case PHASE_STATUSIN:		/* STATE: status in complete			*/
+	switch (ssr) {
+	case 0x1f:			/* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
+	case 0x8f:			/* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
+	    /* STATUS -> MESSAGE IN */
+	    acornscsi_message(host);
+	    break;
+
+	case 0x1e:			/* -> PHASE_MSGOUT				*/
+	case 0x8e:			/* -> PHASE_MSGOUT				*/
+	    /* STATUS -> MESSAGE OUT */
+	    acornscsi_sendmessage(host);
+	    break;
+
+	default:
+	    printk(KERN_ERR "scsi%d.%c: PHASE_STATUSIN, SSR %02X instead of MESSAGE_IN?\n",
+		    host->host->host_no, acornscsi_target(host), ssr);
+	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
+	}
+	return INTR_PROCESSING;
+
+    case PHASE_MSGIN:			/* STATE: message in				*/
+	switch (ssr) {
+	case 0x1e:			/* -> PHASE_MSGOUT				*/
+	case 0x4e:			/* -> PHASE_MSGOUT				*/
+	case 0x8e:			/* -> PHASE_MSGOUT				*/
+	    /* MESSAGE IN -> MESSAGE OUT */
+	    acornscsi_sendmessage(host);
+	    break;
+
+	case 0x1f:			/* -> PHASE_MSGIN, PHASE_DONE, PHASE_DISCONNECT */
+	case 0x2f:
+	case 0x4f:
+	case 0x8f:
+	    acornscsi_message(host);
+	    break;
+
+	case 0x85:
+	    printk("scsi%d.%c: strange message in disconnection\n",
+		host->host->host_no, acornscsi_target(host));
+	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
+	    acornscsi_done(host, &host->SCpnt, DID_ERROR);
+	    break;
+
+	default:
+	    printk(KERN_ERR "scsi%d.%c: PHASE_MSGIN, SSR %02X after message in?\n",
+		    host->host->host_no, acornscsi_target(host), ssr);
+	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
+	}
+	return INTR_PROCESSING;
+
+    case PHASE_DONE:			/* STATE: received status & message		*/
+	switch (ssr) {
+	case 0x85:			/* -> PHASE_IDLE				*/
+	    acornscsi_done(host, &host->SCpnt, DID_OK);
+	    return INTR_NEXT_COMMAND;
+
+	case 0x1e:
+	case 0x8e:
+	    acornscsi_sendmessage(host);
+	    break;
+
+	default:
+	    printk(KERN_ERR "scsi%d.%c: PHASE_DONE, SSR %02X instead of disconnect?\n",
+		    host->host->host_no, acornscsi_target(host), ssr);
+	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
+	}
+	return INTR_PROCESSING;
+
+    case PHASE_ABORTED:
+	switch (ssr) {
+	case 0x85:
+	    if (host->SCpnt)
+		acornscsi_done(host, &host->SCpnt, DID_ABORT);
+	    else {
+		clear_bit(host->scsi.reconnected.target * 8 + host->scsi.reconnected.lun,
+			  host->busyluns);
+		host->scsi.phase = PHASE_IDLE;
+	    }
+	    return INTR_NEXT_COMMAND;
+
+	case 0x1e:
+	case 0x2e:
+	case 0x4e:
+	case 0x8e:
+	    acornscsi_sendmessage(host);
+	    break;
+
+	default:
+	    printk(KERN_ERR "scsi%d.%c: PHASE_ABORTED, SSR %02X?\n",
+		    host->host->host_no, acornscsi_target(host), ssr);
+	    acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
+	}
+	return INTR_PROCESSING;
+
+    default:
+	printk(KERN_ERR "scsi%d.%c: unknown driver phase %d\n",
+		host->host->host_no, acornscsi_target(host), ssr);
+	acornscsi_dumplog(host, host->SCpnt ? host->SCpnt->device->id : 8);
+    }
+    return INTR_PROCESSING;
+}
+
+/*
+ * Prototype: void acornscsi_intr(int irq, void *dev_id)
+ * Purpose  : handle interrupts from Acorn SCSI card
+ * Params   : irq    - interrupt number
+ *	      dev_id - device specific data (AS_Host structure)
+ */
+static irqreturn_t
+acornscsi_intr(int irq, void *dev_id)
+{
+    AS_Host *host = (AS_Host *)dev_id;
+    intr_ret_t ret;
+    int iostatus;
+    int in_irq = 0;
+
+    do {
+	ret = INTR_IDLE;
+
+	iostatus = readb(host->fast + INT_REG);
+
+	if (iostatus & 2) {
+	    acornscsi_dma_intr(host);
+	    iostatus = readb(host->fast + INT_REG);
+	}
+
+	if (iostatus & 8)
+	    ret = acornscsi_sbicintr(host, in_irq);
+
+	/*
+	 * If we have a transfer pending, start it.
+	 * Only start it if the interface has already started transferring
+	 * it's data
+	 */
+	if (host->dma.xfer_required)
+	    acornscsi_dma_xfer(host);
+
+	if (ret == INTR_NEXT_COMMAND)
+	    ret = acornscsi_kick(host);
+
+	in_irq = 1;
+    } while (ret != INTR_IDLE);
+
+    return IRQ_HANDLED;
+}
+
+/*=============================================================================================
+ * Interfaces between interrupt handler and rest of scsi code
+ */
+
+/*
+ * Function : acornscsi_queuecmd(struct scsi_cmnd *cmd)
+ * Purpose  : queues a SCSI command
+ * Params   : cmd  - SCSI command
+ * Returns  : 0, or < 0 on error.
+ */
+static int acornscsi_queuecmd_lck(struct scsi_cmnd *SCpnt)
+{
+    struct scsi_pointer *scsi_pointer = arm_scsi_pointer(SCpnt);
+    void (*done)(struct scsi_cmnd *) = scsi_done;
+    AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata;
+
+#if (DEBUG & DEBUG_NO_WRITE)
+    if (acornscsi_cmdtype(SCpnt->cmnd[0]) == CMD_WRITE && (NO_WRITE & (1 << SCpnt->device->id))) {
+	printk(KERN_CRIT "scsi%d.%c: WRITE attempted with NO_WRITE flag set\n",
+	    host->host->host_no, '0' + SCpnt->device->id);
+	set_host_byte(SCpnt, DID_NO_CONNECT);
+	done(SCpnt);
+	return 0;
+    }
+#endif
+
+    SCpnt->host_scribble = NULL;
+    SCpnt->result = 0;
+    scsi_pointer->phase = (int)acornscsi_datadirection(SCpnt->cmnd[0]);
+    scsi_pointer->sent_command = 0;
+    scsi_pointer->scsi_xferred = 0;
+
+    init_SCp(SCpnt);
+
+    host->stats.queues += 1;
+
+    {
+	unsigned long flags;
+
+	if (!queue_add_cmd_ordered(&host->queues.issue, SCpnt)) {
+		set_host_byte(SCpnt, DID_ERROR);
+	    done(SCpnt);
+	    return 0;
+	}
+	local_irq_save(flags);
+	if (host->scsi.phase == PHASE_IDLE)
+	    acornscsi_kick(host);
+	local_irq_restore(flags);
+    }
+    return 0;
+}
+
+DEF_SCSI_QCMD(acornscsi_queuecmd)
+
+enum res_abort { res_not_running, res_success, res_success_clear, res_snooze };
+
+/*
+ * Prototype: enum res acornscsi_do_abort(struct scsi_cmnd *SCpnt)
+ * Purpose  : abort a command on this host
+ * Params   : SCpnt - command to abort
+ * Returns  : our abort status
+ */
+static enum res_abort acornscsi_do_abort(AS_Host *host, struct scsi_cmnd *SCpnt)
+{
+	enum res_abort res = res_not_running;
+
+	if (queue_remove_cmd(&host->queues.issue, SCpnt)) {
+		/*
+		 * The command was on the issue queue, and has not been
+		 * issued yet.  We can remove the command from the queue,
+		 * and acknowledge the abort.  Neither the devices nor the
+		 * interface know about the command.
+		 */
+//#if (DEBUG & DEBUG_ABORT)
+		printk("on issue queue ");
+//#endif
+		res = res_success;
+	} else if (queue_remove_cmd(&host->queues.disconnected, SCpnt)) {
+		/*
+		 * The command was on the disconnected queue.  Simply
+		 * acknowledge the abort condition, and when the target
+		 * reconnects, we will give it an ABORT message.  The
+		 * target should then disconnect, and we will clear
+		 * the busylun bit.
+		 */
+//#if (DEBUG & DEBUG_ABORT)
+		printk("on disconnected queue ");
+//#endif
+		res = res_success;
+	} else if (host->SCpnt == SCpnt) {
+		unsigned long flags;
+
+//#if (DEBUG & DEBUG_ABORT)
+		printk("executing ");
+//#endif
+
+		local_irq_save(flags);
+		switch (host->scsi.phase) {
+		/*
+		 * If the interface is idle, and the command is 'disconnectable',
+		 * then it is the same as on the disconnected queue.  We simply
+		 * remove all traces of the command.  When the target reconnects,
+		 * we will give it an ABORT message since the command could not
+		 * be found.  When the target finally disconnects, we will clear
+		 * the busylun bit.
+		 */
+		case PHASE_IDLE:
+			if (host->scsi.disconnectable) {
+				host->scsi.disconnectable = 0;
+				host->SCpnt = NULL;
+				res = res_success;
+			}
+			break;
+
+		/*
+		 * If the command has connected and done nothing further,
+		 * simply force a disconnect.  We also need to clear the
+		 * busylun bit.
+		 */
+		case PHASE_CONNECTED:
+			sbic_arm_write(host, SBIC_CMND, CMND_DISCONNECT);
+			host->SCpnt = NULL;
+			res = res_success_clear;
+			break;
+
+		default:
+			acornscsi_abortcmd(host);
+			res = res_snooze;
+		}
+		local_irq_restore(flags);
+	} else if (host->origSCpnt == SCpnt) {
+		/*
+		 * The command will be executed next, but a command
+		 * is currently using the interface.  This is similar to
+		 * being on the issue queue, except the busylun bit has
+		 * been set.
+		 */
+		host->origSCpnt = NULL;
+//#if (DEBUG & DEBUG_ABORT)
+		printk("waiting for execution ");
+//#endif
+		res = res_success_clear;
+	} else
+		printk("unknown ");
+
+	return res;
+}
+
+/*
+ * Prototype: int acornscsi_abort(struct scsi_cmnd *SCpnt)
+ * Purpose  : abort a command on this host
+ * Params   : SCpnt - command to abort
+ * Returns  : one of SCSI_ABORT_ macros
+ */
+int acornscsi_abort(struct scsi_cmnd *SCpnt)
+{
+	AS_Host *host = (AS_Host *) SCpnt->device->host->hostdata;
+	int result;
+
+	host->stats.aborts += 1;
+
+#if (DEBUG & DEBUG_ABORT)
+	{
+		int asr, ssr;
+		asr = sbic_arm_read(host, SBIC_ASR);
+		ssr = sbic_arm_read(host, SBIC_SSR);
+
+		printk(KERN_WARNING "acornscsi_abort: ");
+		print_sbic_status(asr, ssr, host->scsi.phase);
+		acornscsi_dumplog(host, SCpnt->device->id);
+	}
+#endif
+
+	printk("scsi%d: ", host->host->host_no);
+
+	switch (acornscsi_do_abort(host, SCpnt)) {
+	/*
+	 * We managed to find the command and cleared it out.
+	 * We do not expect the command to be executing on the
+	 * target, but we have set the busylun bit.
+	 */
+	case res_success_clear:
+//#if (DEBUG & DEBUG_ABORT)
+		printk("clear ");
+//#endif
+		clear_bit(SCpnt->device->id * 8 +
+			  (u8)(SCpnt->device->lun & 0x7), host->busyluns);
+		fallthrough;
+
+	/*
+	 * We found the command, and cleared it out.  Either
+	 * the command is still known to be executing on the
+	 * target, or the busylun bit is not set.
+	 */
+	case res_success:
+//#if (DEBUG & DEBUG_ABORT)
+		printk("success\n");
+//#endif
+		result = SUCCESS;
+		break;
+
+	/*
+	 * We did find the command, but unfortunately we couldn't
+	 * unhook it from ourselves.  Wait some more, and if it
+	 * still doesn't complete, reset the interface.
+	 */
+	case res_snooze:
+//#if (DEBUG & DEBUG_ABORT)
+		printk("snooze\n");
+//#endif
+		result = FAILED;
+		break;
+
+	/*
+	 * The command could not be found (either because it completed,
+	 * or it got dropped.
+	 */
+	default:
+	case res_not_running:
+		acornscsi_dumplog(host, SCpnt->device->id);
+		result = FAILED;
+//#if (DEBUG & DEBUG_ABORT)
+		printk("not running\n");
+//#endif
+		break;
+	}
+
+	return result;
+}
+
+/*
+ * Prototype: int acornscsi_reset(struct scsi_cmnd *SCpnt)
+ * Purpose  : reset a command on this host/reset this host
+ * Params   : SCpnt  - command causing reset
+ * Returns  : one of SCSI_RESET_ macros
+ */
+int acornscsi_host_reset(struct scsi_cmnd *SCpnt)
+{
+	AS_Host *host = (AS_Host *)SCpnt->device->host->hostdata;
+	struct scsi_cmnd *SCptr;
+    
+    host->stats.resets += 1;
+
+#if (DEBUG & DEBUG_RESET)
+    {
+	int asr, ssr, devidx;
+
+	asr = sbic_arm_read(host, SBIC_ASR);
+	ssr = sbic_arm_read(host, SBIC_SSR);
+
+	printk(KERN_WARNING "acornscsi_reset: ");
+	print_sbic_status(asr, ssr, host->scsi.phase);
+	for (devidx = 0; devidx < 9; devidx++)
+	    acornscsi_dumplog(host, devidx);
+    }
+#endif
+
+    acornscsi_dma_stop(host);
+
+    /*
+     * do hard reset.  This resets all devices on this host, and so we
+     * must set the reset status on all commands.
+     */
+    acornscsi_resetcard(host);
+
+    while ((SCptr = queue_remove(&host->queues.disconnected)) != NULL)
+	;
+
+    return SUCCESS;
+}
+
+/*==============================================================================================
+ * initialisation & miscellaneous support
+ */
+
+/*
+ * Function: char *acornscsi_info(struct Scsi_Host *host)
+ * Purpose : return a string describing this interface
+ * Params  : host - host to give information on
+ * Returns : a constant string
+ */
+const
+char *acornscsi_info(struct Scsi_Host *host)
+{
+    static char string[100], *p;
+
+    p = string;
+    
+    p += sprintf(string, "%s at port %08lX irq %d v%d.%d.%d"
+#ifdef CONFIG_SCSI_ACORNSCSI_SYNC
+    " SYNC"
+#endif
+#if (DEBUG & DEBUG_NO_WRITE)
+    " NOWRITE (" __stringify(NO_WRITE) ")"
+#endif
+		, host->hostt->name, host->io_port, host->irq,
+		VER_MAJOR, VER_MINOR, VER_PATCH);
+    return string;
+}
+
+static int acornscsi_show_info(struct seq_file *m, struct Scsi_Host *instance)
+{
+    int devidx;
+    struct scsi_device *scd;
+    AS_Host *host;
+
+    host  = (AS_Host *)instance->hostdata;
+    
+    seq_printf(m, "AcornSCSI driver v%d.%d.%d"
+#ifdef CONFIG_SCSI_ACORNSCSI_SYNC
+    " SYNC"
+#endif
+#if (DEBUG & DEBUG_NO_WRITE)
+    " NOWRITE (" __stringify(NO_WRITE) ")"
+#endif
+		"\n\n", VER_MAJOR, VER_MINOR, VER_PATCH);
+
+    seq_printf(m,	"SBIC: WD33C93A  Address: %p    IRQ : %d\n",
+			host->base + SBIC_REGIDX, host->scsi.irq);
+#ifdef USE_DMAC
+    seq_printf(m,	"DMAC: uPC71071  Address: %p  IRQ : %d\n\n",
+			host->base + DMAC_OFFSET, host->scsi.irq);
+#endif
+
+    seq_printf(m,	"Statistics:\n"
+			"Queued commands: %-10u    Issued commands: %-10u\n"
+			"Done commands  : %-10u    Reads          : %-10u\n"
+			"Writes         : %-10u    Others         : %-10u\n"
+			"Disconnects    : %-10u    Aborts         : %-10u\n"
+			"Resets         : %-10u\n\nLast phases:",
+			host->stats.queues,		host->stats.removes,
+			host->stats.fins,		host->stats.reads,
+			host->stats.writes,		host->stats.miscs,
+			host->stats.disconnects,	host->stats.aborts,
+			host->stats.resets);
+
+    for (devidx = 0; devidx < 9; devidx ++) {
+	unsigned int statptr, prev;
+
+	seq_printf(m, "\n%c:", devidx == 8 ? 'H' : ('0' + devidx));
+	statptr = host->status_ptr[devidx] - 10;
+
+	if ((signed int)statptr < 0)
+	    statptr += STATUS_BUFFER_SIZE;
+
+	prev = host->status[devidx][statptr].when;
+
+	for (; statptr != host->status_ptr[devidx]; statptr = (statptr + 1) & (STATUS_BUFFER_SIZE - 1)) {
+	    if (host->status[devidx][statptr].when) {
+		seq_printf(m, "%c%02X:%02X+%2ld",
+			host->status[devidx][statptr].irq ? '-' : ' ',
+			host->status[devidx][statptr].ph,
+			host->status[devidx][statptr].ssr,
+			(host->status[devidx][statptr].when - prev) < 100 ?
+				(host->status[devidx][statptr].when - prev) : 99);
+		prev = host->status[devidx][statptr].when;
+	    }
+	}
+    }
+
+    seq_printf(m, "\nAttached devices:\n");
+
+    shost_for_each_device(scd, instance) {
+	seq_printf(m, "Device/Lun TaggedQ      Sync\n");
+	seq_printf(m, "     %d/%llu   ", scd->id, scd->lun);
+	if (scd->tagged_supported)
+		seq_printf(m, "%3sabled ",
+			     scd->simple_tags ? "en" : "dis");
+	else
+		seq_printf(m, "unsupported  ");
+
+	if (host->device[scd->id].sync_xfer & 15)
+		seq_printf(m, "offset %d, %d ns\n",
+			     host->device[scd->id].sync_xfer & 15,
+			     acornscsi_getperiod(host->device[scd->id].sync_xfer));
+	else
+		seq_printf(m, "async\n");
+
+    }
+    return 0;
+}
+
+static struct scsi_host_template acornscsi_template = {
+	.module			= THIS_MODULE,
+	.show_info		= acornscsi_show_info,
+	.name			= "AcornSCSI",
+	.info			= acornscsi_info,
+	.queuecommand		= acornscsi_queuecmd,
+	.eh_abort_handler	= acornscsi_abort,
+	.eh_host_reset_handler	= acornscsi_host_reset,
+	.can_queue		= 16,
+	.this_id		= 7,
+	.sg_tablesize		= SG_ALL,
+	.cmd_per_lun		= 2,
+	.dma_boundary		= PAGE_SIZE - 1,
+	.proc_name		= "acornscsi",
+	.cmd_size		= sizeof(struct arm_cmd_priv),
+};
+
+static int acornscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
+{
+	struct Scsi_Host *host;
+	AS_Host *ashost;
+	int ret;
+
+	ret = ecard_request_resources(ec);
+	if (ret)
+		goto out;
+
+	host = scsi_host_alloc(&acornscsi_template, sizeof(AS_Host));
+	if (!host) {
+		ret = -ENOMEM;
+		goto out_release;
+	}
+
+	ashost = (AS_Host *)host->hostdata;
+
+	ashost->base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
+	ashost->fast = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
+	if (!ashost->base || !ashost->fast) {
+		ret = -ENOMEM;
+		goto out_put;
+	}
+
+	host->irq = ec->irq;
+	ashost->host = host;
+	ashost->scsi.irq = host->irq;
+
+	ec->irqaddr	= ashost->fast + INT_REG;
+	ec->irqmask	= 0x0a;
+
+	ret = request_irq(host->irq, acornscsi_intr, 0, "acornscsi", ashost);
+	if (ret) {
+		printk(KERN_CRIT "scsi%d: IRQ%d not free: %d\n",
+			host->host_no, ashost->scsi.irq, ret);
+		goto out_put;
+	}
+
+	memset(&ashost->stats, 0, sizeof (ashost->stats));
+	queue_initialise(&ashost->queues.issue);
+	queue_initialise(&ashost->queues.disconnected);
+	msgqueue_initialise(&ashost->scsi.msgs);
+
+	acornscsi_resetcard(ashost);
+
+	ret = scsi_add_host(host, &ec->dev);
+	if (ret)
+		goto out_irq;
+
+	scsi_scan_host(host);
+	goto out;
+
+ out_irq:
+	free_irq(host->irq, ashost);
+	msgqueue_free(&ashost->scsi.msgs);
+	queue_free(&ashost->queues.disconnected);
+	queue_free(&ashost->queues.issue);
+ out_put:
+	ecardm_iounmap(ec, ashost->fast);
+	ecardm_iounmap(ec, ashost->base);
+	scsi_host_put(host);
+ out_release:
+	ecard_release_resources(ec);
+ out:
+	return ret;
+}
+
+static void acornscsi_remove(struct expansion_card *ec)
+{
+	struct Scsi_Host *host = ecard_get_drvdata(ec);
+	AS_Host *ashost = (AS_Host *)host->hostdata;
+
+	ecard_set_drvdata(ec, NULL);
+	scsi_remove_host(host);
+
+	/*
+	 * Put card into RESET state
+	 */
+	writeb(0x80, ashost->fast + PAGE_REG);
+
+	free_irq(host->irq, ashost);
+
+	msgqueue_free(&ashost->scsi.msgs);
+	queue_free(&ashost->queues.disconnected);
+	queue_free(&ashost->queues.issue);
+	ecardm_iounmap(ec, ashost->fast);
+	ecardm_iounmap(ec, ashost->base);
+	scsi_host_put(host);
+	ecard_release_resources(ec);
+}
+
+static const struct ecard_id acornscsi_cids[] = {
+	{ MANU_ACORN, PROD_ACORN_SCSI },
+	{ 0xffff, 0xffff },
+};
+
+static struct ecard_driver acornscsi_driver = {
+	.probe		= acornscsi_probe,
+	.remove		= acornscsi_remove,
+	.id_table	= acornscsi_cids,
+	.drv = {
+		.name		= "acornscsi",
+	},
+};
+
+static int __init acornscsi_init(void)
+{
+	return ecard_register_driver(&acornscsi_driver);
+}
+
+static void __exit acornscsi_exit(void)
+{
+	ecard_remove_driver(&acornscsi_driver);
+}
+
+module_init(acornscsi_init);
+module_exit(acornscsi_exit);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("AcornSCSI driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/scsi/arm/acornscsi.h b/drivers/scsi/arm/acornscsi.h
new file mode 100644
index 000000000..376c76bc2
--- /dev/null
+++ b/drivers/scsi/arm/acornscsi.h
@@ -0,0 +1,350 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ *  linux/drivers/acorn/scsi/acornscsi.h
+ *
+ *  Copyright (C) 1997 Russell King
+ *
+ *  Acorn SCSI driver
+ */
+#ifndef ACORNSCSI_H
+#define ACORNSCSI_H
+
+/* SBIC registers */
+#define SBIC_OWNID		0
+#define OWNID_FS1		(1<<7)
+#define OWNID_FS2		(1<<6)
+#define OWNID_EHP		(1<<4)
+#define OWNID_EAF		(1<<3)
+
+#define SBIC_CTRL		1
+#define CTRL_DMAMODE		(1<<7)
+#define CTRL_DMADBAMODE		(1<<6)
+#define CTRL_DMABURST		(1<<5)
+#define CTRL_DMAPOLLED		0
+#define CTRL_HHP		(1<<4)
+#define CTRL_EDI		(1<<3)
+#define CTRL_IDI		(1<<2)
+#define CTRL_HA			(1<<1)
+#define CTRL_HSP		(1<<0)
+
+#define SBIC_TIMEOUT		2
+#define SBIC_TOTSECTS		3
+#define SBIC_TOTHEADS		4
+#define SBIC_TOTCYLH		5
+#define SBIC_TOTCYLL		6
+#define SBIC_LOGADDRH		7
+#define SBIC_LOGADDRM2		8
+#define SBIC_LOGADDRM1		9
+#define SBIC_LOGADDRL		10
+#define SBIC_SECTORNUM		11
+#define SBIC_HEADNUM		12
+#define SBIC_CYLH		13
+#define SBIC_CYLL		14
+#define SBIC_TARGETLUN		15
+#define TARGETLUN_TLV		(1<<7)
+#define TARGETLUN_DOK		(1<<6)
+
+#define SBIC_CMNDPHASE		16
+#define SBIC_SYNCHTRANSFER	17
+#define SYNCHTRANSFER_OF0	0x00
+#define SYNCHTRANSFER_OF1	0x01
+#define SYNCHTRANSFER_OF2	0x02
+#define SYNCHTRANSFER_OF3	0x03
+#define SYNCHTRANSFER_OF4	0x04
+#define SYNCHTRANSFER_OF5	0x05
+#define SYNCHTRANSFER_OF6	0x06
+#define SYNCHTRANSFER_OF7	0x07
+#define SYNCHTRANSFER_OF8	0x08
+#define SYNCHTRANSFER_OF9	0x09
+#define SYNCHTRANSFER_OF10	0x0A
+#define SYNCHTRANSFER_OF11	0x0B
+#define SYNCHTRANSFER_OF12	0x0C
+#define SYNCHTRANSFER_8DBA	0x00
+#define SYNCHTRANSFER_2DBA	0x20
+#define SYNCHTRANSFER_3DBA	0x30
+#define SYNCHTRANSFER_4DBA	0x40
+#define SYNCHTRANSFER_5DBA	0x50
+#define SYNCHTRANSFER_6DBA	0x60
+#define SYNCHTRANSFER_7DBA	0x70
+
+#define SBIC_TRANSCNTH		18
+#define SBIC_TRANSCNTM		19
+#define SBIC_TRANSCNTL		20
+#define SBIC_DESTID		21
+#define DESTID_SCC		(1<<7)
+#define DESTID_DPD		(1<<6)
+
+#define SBIC_SOURCEID		22
+#define SOURCEID_ER		(1<<7)
+#define SOURCEID_ES		(1<<6)
+#define SOURCEID_DSP		(1<<5)
+#define SOURCEID_SIV		(1<<4)
+
+#define SBIC_SSR		23
+#define SBIC_CMND		24
+#define CMND_RESET		0x00
+#define CMND_ABORT		0x01
+#define CMND_ASSERTATN		0x02
+#define CMND_NEGATEACK		0x03
+#define CMND_DISCONNECT		0x04
+#define CMND_RESELECT		0x05
+#define CMND_SELWITHATN		0x06
+#define CMND_SELECT		0x07
+#define CMND_SELECTATNTRANSFER	0x08
+#define CMND_SELECTTRANSFER	0x09
+#define CMND_RESELECTRXDATA	0x0A
+#define CMND_RESELECTTXDATA	0x0B
+#define CMND_WAITFORSELRECV	0x0C
+#define CMND_SENDSTATCMD	0x0D
+#define CMND_SENDDISCONNECT	0x0E
+#define CMND_SETIDI		0x0F
+#define CMND_RECEIVECMD		0x10
+#define CMND_RECEIVEDTA		0x11
+#define CMND_RECEIVEMSG		0x12
+#define CMND_RECEIVEUSP		0x13
+#define CMND_SENDCMD		0x14
+#define CMND_SENDDATA		0x15
+#define CMND_SENDMSG		0x16
+#define CMND_SENDUSP		0x17
+#define CMND_TRANSLATEADDR	0x18
+#define CMND_XFERINFO		0x20
+#define CMND_SBT		(1<<7)
+
+#define SBIC_DATA		25
+#define SBIC_ASR		26
+#define ASR_INT			(1<<7)
+#define ASR_LCI			(1<<6)
+#define ASR_BSY			(1<<5)
+#define ASR_CIP			(1<<4)
+#define ASR_PE			(1<<1)
+#define ASR_DBR			(1<<0)
+
+/* DMAC registers */
+#define DMAC_INIT		0x00
+#define INIT_8BIT		(1)
+
+#define DMAC_CHANNEL		0x80
+#define CHANNEL_0		0x00
+#define CHANNEL_1		0x01
+#define CHANNEL_2		0x02
+#define CHANNEL_3		0x03
+
+#define DMAC_TXCNTLO		0x01
+#define DMAC_TXCNTHI		0x81
+#define DMAC_TXADRLO		0x02
+#define DMAC_TXADRMD		0x82
+#define DMAC_TXADRHI		0x03
+
+#define DMAC_DEVCON0		0x04
+#define DEVCON0_AKL		(1<<7)
+#define DEVCON0_RQL		(1<<6)
+#define DEVCON0_EXW		(1<<5)
+#define DEVCON0_ROT		(1<<4)
+#define DEVCON0_CMP		(1<<3)
+#define DEVCON0_DDMA		(1<<2)
+#define DEVCON0_AHLD		(1<<1)
+#define DEVCON0_MTM		(1<<0)
+
+#define DMAC_DEVCON1		0x84
+#define DEVCON1_WEV		(1<<1)
+#define DEVCON1_BHLD		(1<<0)
+
+#define DMAC_MODECON		0x05
+#define MODECON_WOED		0x01
+#define MODECON_VERIFY		0x00
+#define MODECON_READ		0x04
+#define MODECON_WRITE		0x08
+#define MODECON_AUTOINIT	0x10
+#define MODECON_ADDRDIR		0x20
+#define MODECON_DEMAND		0x00
+#define MODECON_SINGLE		0x40
+#define MODECON_BLOCK		0x80
+#define MODECON_CASCADE		0xC0
+
+#define DMAC_STATUS		0x85
+#define STATUS_TC0		(1<<0)
+#define STATUS_RQ0		(1<<4)
+
+#define DMAC_TEMPLO		0x06
+#define DMAC_TEMPHI		0x86
+#define DMAC_REQREG		0x07
+#define DMAC_MASKREG		0x87
+#define MASKREG_M0		0x01
+#define MASKREG_M1		0x02
+#define MASKREG_M2		0x04
+#define MASKREG_M3		0x08
+
+/* miscellaneous internal variables */
+
+#define MASK_ON		(MASKREG_M3|MASKREG_M2|MASKREG_M1|MASKREG_M0)
+#define MASK_OFF	(MASKREG_M3|MASKREG_M2|MASKREG_M1)
+
+/*
+ * SCSI driver phases
+ */
+typedef enum {
+    PHASE_IDLE,					/* we're not planning on doing anything	 */
+    PHASE_CONNECTING,				/* connecting to a target		 */
+    PHASE_CONNECTED,				/* connected to a target		 */
+    PHASE_MSGOUT,				/* message out to device		 */
+    PHASE_RECONNECTED,				/* reconnected				 */
+    PHASE_COMMANDPAUSED,			/* command partly sent			 */
+    PHASE_COMMAND,				/* command all sent			 */
+    PHASE_DATAOUT,				/* data out to device			 */
+    PHASE_DATAIN,				/* data in from device			 */
+    PHASE_STATUSIN,				/* status in from device		 */
+    PHASE_MSGIN,				/* message in from device		 */
+    PHASE_DONE,					/* finished				 */
+    PHASE_ABORTED,				/* aborted				 */
+    PHASE_DISCONNECT,				/* disconnecting			 */
+} phase_t;
+
+/*
+ * After interrupt, what to do now
+ */
+typedef enum {
+    INTR_IDLE,					/* not expecting another IRQ		 */
+    INTR_NEXT_COMMAND,				/* start next command			 */
+    INTR_PROCESSING,				/* interrupt routine still processing	 */
+} intr_ret_t;
+
+/*
+ * DMA direction
+ */
+typedef enum {
+    DMA_OUT,					/* DMA from memory to chip		*/
+    DMA_IN					/* DMA from chip to memory		*/
+} dmadir_t;
+
+/*
+ * Synchronous transfer state
+ */
+typedef enum {					/* Synchronous transfer state		*/
+    SYNC_ASYNCHRONOUS,				/* don't negotiate synchronous transfers*/
+    SYNC_NEGOCIATE,				/* start negotiation			*/
+    SYNC_SENT_REQUEST,				/* sent SDTR message			*/
+    SYNC_COMPLETED,				/* received SDTR reply			*/
+} syncxfer_t;
+
+/*
+ * Command type
+ */
+typedef enum {					/* command type				*/
+    CMD_READ,					/* READ_6, READ_10, READ_12		*/
+    CMD_WRITE,					/* WRITE_6, WRITE_10, WRITE_12		*/
+    CMD_MISC,					/* Others				*/
+} cmdtype_t;
+
+/*
+ * Data phase direction
+ */
+typedef enum {					/* Data direction			*/
+    DATADIR_IN,					/* Data in phase expected		*/
+    DATADIR_OUT					/* Data out phase expected		*/
+} datadir_t;
+
+#include "queue.h"
+#include "msgqueue.h"
+
+#define STATUS_BUFFER_SIZE	32
+/*
+ * This is used to dump the previous states of the SBIC
+ */
+struct status_entry {
+	unsigned long	when;
+	unsigned char	ssr;
+	unsigned char	ph;
+	unsigned char	irq;
+	unsigned char	unused;
+};
+
+#define ADD_STATUS(_q,_ssr,_ph,_irq) \
+({									\
+	host->status[(_q)][host->status_ptr[(_q)]].when = jiffies;	\
+	host->status[(_q)][host->status_ptr[(_q)]].ssr  = (_ssr);	\
+	host->status[(_q)][host->status_ptr[(_q)]].ph   = (_ph);	\
+	host->status[(_q)][host->status_ptr[(_q)]].irq  = (_irq);	\
+	host->status_ptr[(_q)] = (host->status_ptr[(_q)] + 1) & (STATUS_BUFFER_SIZE - 1); \
+})
+
+/*
+ * AcornSCSI host specific data
+ */
+typedef struct acornscsi_hostdata {
+    /* miscellaneous */
+    struct Scsi_Host	*host;			/* host					*/
+    struct scsi_cmnd	*SCpnt;			/* currently processing command		*/
+    struct scsi_cmnd	*origSCpnt;		/* original connecting command		*/
+    void __iomem	*base;			/* memc base address 			*/
+    void __iomem	*fast;			/* fast ioc base address		*/
+
+    /* driver information */
+    struct {
+	unsigned int	irq;			/* interrupt				*/
+	phase_t		phase;			/* current phase			*/
+
+	struct {
+	    unsigned char	target;		/* reconnected target			*/
+	    unsigned char	lun;		/* reconnected lun			*/
+	    unsigned char	tag;		/* reconnected tag			*/
+	} reconnected;
+
+	struct scsi_pointer	SCp;			/* current commands data pointer	*/
+
+	MsgQueue_t	msgs;
+
+	unsigned short	last_message;		/* last message to be sent		*/
+	unsigned char	disconnectable:1;	/* this command can be disconnected	*/
+    } scsi;
+
+    /* statistics information */
+    struct {
+	unsigned int	queues;
+	unsigned int	removes;
+	unsigned int	fins;
+	unsigned int	reads;
+	unsigned int	writes;
+	unsigned int	miscs;
+	unsigned int	disconnects;
+	unsigned int	aborts;
+	unsigned int	resets;
+    } stats;
+
+    /* queue handling */
+    struct {
+	Queue_t		issue;			/* issue queue				*/
+	Queue_t		disconnected;		/* disconnected command queue		*/
+    } queues;
+
+    /* per-device info */
+    struct {
+	unsigned char	sync_xfer;		/* synchronous transfer (SBIC value)	*/
+	syncxfer_t	sync_state;		/* sync xfer negotiation state		*/
+	unsigned char	disconnect_ok:1;	/* device can disconnect		*/
+    } device[8];
+    unsigned long	busyluns[64 / sizeof(unsigned long)];/* array of bits indicating LUNs busy	*/
+
+    /* DMA info */
+    struct {
+	unsigned int	free_addr;		/* next free address			*/
+	unsigned int	start_addr;		/* start address of current transfer	*/
+	dmadir_t	direction;		/* dma direction			*/
+	unsigned int	transferred;		/* number of bytes transferred		*/
+	unsigned int	xfer_start;		/* scheduled DMA transfer start		*/
+	unsigned int	xfer_length;		/* scheduled DMA transfer length	*/
+	char		*xfer_ptr;		/* pointer to area			*/
+	unsigned char	xfer_required:1;	/* set if we need to transfer something	*/
+	unsigned char	xfer_setup:1;		/* set if DMA is setup			*/
+	unsigned char	xfer_done:1;		/* set if DMA reached end of BH list	*/
+    } dma;
+
+    /* card info */
+    struct {
+	unsigned char	page_reg;		/* current setting of page reg		*/
+    } card;
+
+    unsigned char status_ptr[9];
+    struct status_entry status[9][STATUS_BUFFER_SIZE];
+} AS_Host;
+
+#endif /* ACORNSCSI_H */
diff --git a/drivers/scsi/arm/arm_scsi.h b/drivers/scsi/arm/arm_scsi.h
new file mode 100644
index 000000000..ea9fcd92c
--- /dev/null
+++ b/drivers/scsi/arm/arm_scsi.h
@@ -0,0 +1,136 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ *  Copyright (C) 2002 Russell King
+ *
+ *  Commonly used functions by the ARM SCSI-II drivers.
+ */
+
+#include <linux/scatterlist.h>
+
+#define BELT_AND_BRACES
+
+struct arm_cmd_priv {
+	struct scsi_pointer scsi_pointer;
+};
+
+static inline struct scsi_pointer *arm_scsi_pointer(struct scsi_cmnd *cmd)
+{
+	struct arm_cmd_priv *acmd = scsi_cmd_priv(cmd);
+
+	return &acmd->scsi_pointer;
+}
+
+/*
+ * The scatter-gather list handling.  This contains all
+ * the yucky stuff that needs to be fixed properly.
+ */
+
+/*
+ * copy_SCp_to_sg() Assumes contiguous allocation at @sg of at-most @max
+ * entries of uninitialized memory. SCp is from scsi-ml and has a valid
+ * (possibly chained) sg-list
+ */
+static inline int copy_SCp_to_sg(struct scatterlist *sg, struct scsi_pointer *SCp, int max)
+{
+	int bufs = SCp->buffers_residual;
+
+	/* FIXME: It should be easy for drivers to loop on copy_SCp_to_sg().
+	 * and to remove this BUG_ON. Use min() in-its-place
+	 */
+	BUG_ON(bufs + 1 > max);
+
+	sg_set_buf(sg, SCp->ptr, SCp->this_residual);
+
+	if (bufs) {
+		struct scatterlist *src_sg;
+		unsigned i;
+
+		for_each_sg(sg_next(SCp->buffer), src_sg, bufs, i)
+			*(++sg) = *src_sg;
+		sg_mark_end(sg);
+	}
+
+	return bufs + 1;
+}
+
+static inline int next_SCp(struct scsi_pointer *SCp)
+{
+	int ret = SCp->buffers_residual;
+	if (ret) {
+		SCp->buffer = sg_next(SCp->buffer);
+		SCp->buffers_residual--;
+		SCp->ptr = sg_virt(SCp->buffer);
+		SCp->this_residual = SCp->buffer->length;
+	} else {
+		SCp->ptr = NULL;
+		SCp->this_residual = 0;
+	}
+	return ret;
+}
+
+static inline unsigned char get_next_SCp_byte(struct scsi_pointer *SCp)
+{
+	char c = *SCp->ptr;
+
+	SCp->ptr += 1;
+	SCp->this_residual -= 1;
+
+	return c;
+}
+
+static inline void put_next_SCp_byte(struct scsi_pointer *SCp, unsigned char c)
+{
+	*SCp->ptr = c;
+	SCp->ptr += 1;
+	SCp->this_residual -= 1;
+}
+
+static inline void init_SCp(struct scsi_cmnd *SCpnt)
+{
+	struct scsi_pointer *scsi_pointer = arm_scsi_pointer(SCpnt);
+
+	memset(scsi_pointer, 0, sizeof(struct scsi_pointer));
+
+	if (scsi_bufflen(SCpnt)) {
+		unsigned long len = 0;
+
+		scsi_pointer->buffer = scsi_sglist(SCpnt);
+		scsi_pointer->buffers_residual = scsi_sg_count(SCpnt) - 1;
+		scsi_pointer->ptr = sg_virt(scsi_pointer->buffer);
+		scsi_pointer->this_residual = scsi_pointer->buffer->length;
+		scsi_pointer->phase = scsi_bufflen(SCpnt);
+
+#ifdef BELT_AND_BRACES
+		{	/*
+			 * Calculate correct buffer length.  Some commands
+			 * come in with the wrong scsi_bufflen.
+			 */
+			struct scatterlist *sg;
+			unsigned i, sg_count = scsi_sg_count(SCpnt);
+
+			scsi_for_each_sg(SCpnt, sg, sg_count, i)
+				len += sg->length;
+
+			if (scsi_bufflen(SCpnt) != len) {
+				printk(KERN_WARNING
+				       "scsi%d.%c: bad request buffer "
+				       "length %d, should be %ld\n",
+					SCpnt->device->host->host_no,
+					'0' + SCpnt->device->id,
+					scsi_bufflen(SCpnt), len);
+				/*
+				 * FIXME: Totaly naive fixup. We should abort
+				 * with error
+				 */
+				scsi_pointer->phase =
+					min_t(unsigned long, len,
+					      scsi_bufflen(SCpnt));
+			}
+		}
+#endif
+	} else {
+		scsi_pointer->ptr = NULL;
+		scsi_pointer->this_residual = 0;
+		scsi_pointer->phase = 0;
+	}
+}
diff --git a/drivers/scsi/arm/arxescsi.c b/drivers/scsi/arm/arxescsi.c
new file mode 100644
index 000000000..2527b542b
--- /dev/null
+++ b/drivers/scsi/arm/arxescsi.c
@@ -0,0 +1,363 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * linux/drivers/scsi/arm/arxescsi.c
+ *
+ * Copyright (C) 1997-2000 Russell King, Stefan Hanske
+ *
+ * This driver is based on experimentation.  Hence, it may have made
+ * assumptions about the particular card that I have available, and
+ * may not be reliable!
+ *
+ * Changelog:
+ *  30-08-1997	RMK	0.0.0	Created, READONLY version as cumana_2.c
+ *  22-01-1998	RMK	0.0.1	Updated to 2.1.80
+ *  15-04-1998	RMK	0.0.1	Only do PIO if FAS216 will allow it.
+ *  11-06-1998 	SH	0.0.2   Changed to support ARXE 16-bit SCSI card
+ *				enabled writing
+ *  01-01-2000	SH	0.1.0   Added *real* pseudo dma writing
+ *				(arxescsi_pseudo_dma_write)
+ *  02-04-2000	RMK	0.1.1	Updated for new error handling code.
+ *  22-10-2000  SH		Updated for new registering scheme.
+ */
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/ioport.h>
+#include <linux/proc_fs.h>
+#include <linux/unistd.h>
+#include <linux/stat.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+
+#include <asm/dma.h>
+#include <asm/io.h>
+#include <asm/ecard.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_tcq.h>
+#include "fas216.h"
+
+struct arxescsi_info {
+	FAS216_Info		info;
+	struct expansion_card	*ec;
+	void __iomem		*base;
+};
+
+#define DMADATA_OFFSET	(0x200)
+
+#define DMASTAT_OFFSET	(0x600)
+#define DMASTAT_DRQ	(1 << 0)
+
+#define CSTATUS_IRQ	(1 << 0)
+
+#define VERSION "1.10 (23/01/2003 2.5.57)"
+
+/*
+ * Function: int arxescsi_dma_setup(host, SCpnt, direction, min_type)
+ * Purpose : initialises DMA/PIO
+ * Params  : host      - host
+ *	     SCpnt     - command
+ *	     direction - DMA on to/off of card
+ *	     min_type  - minimum DMA support that we must have for this transfer
+ * Returns : 0 if we should not set CMD_WITHDMA for transfer info command
+ */
+static fasdmatype_t
+arxescsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
+		       fasdmadir_t direction, fasdmatype_t min_type)
+{
+	/*
+	 * We don't do real DMA
+	 */
+	return fasdma_pseudo;
+}
+
+static void arxescsi_pseudo_dma_write(unsigned char *addr, void __iomem *base)
+{
+       __asm__ __volatile__(
+       "               stmdb   sp!, {r0-r12}\n"
+       "               mov     r3, %0\n"
+       "               mov     r1, %1\n"
+       "               add     r2, r1, #512\n"
+       "               mov     r4, #256\n"
+       ".loop_1:       ldmia   r3!, {r6, r8, r10, r12}\n"
+       "               mov     r5, r6, lsl #16\n"
+       "               mov     r7, r8, lsl #16\n"
+       ".loop_2:       ldrb    r0, [r1, #1536]\n"
+       "               tst     r0, #1\n"
+       "               beq     .loop_2\n"
+       "               stmia   r2, {r5-r8}\n\t"
+       "               mov     r9, r10, lsl #16\n"
+       "               mov     r11, r12, lsl #16\n"
+       ".loop_3:       ldrb    r0, [r1, #1536]\n"
+       "               tst     r0, #1\n"
+       "               beq     .loop_3\n"
+       "               stmia   r2, {r9-r12}\n"
+       "               subs    r4, r4, #16\n"
+       "               bne     .loop_1\n"
+       "               ldmia   sp!, {r0-r12}\n"
+       :
+       : "r" (addr), "r" (base));
+}
+
+/*
+ * Function: int arxescsi_dma_pseudo(host, SCpnt, direction, transfer)
+ * Purpose : handles pseudo DMA
+ * Params  : host      - host
+ *	     SCpnt     - command
+ *	     direction - DMA on to/off of card
+ *	     transfer  - minimum number of bytes we expect to transfer
+ */
+static void
+arxescsi_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
+		    fasdmadir_t direction, int transfer)
+{
+	struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
+	unsigned int length, error = 0;
+	void __iomem *base = info->info.scsi.io_base;
+	unsigned char *addr;
+
+	length = SCp->this_residual;
+	addr = SCp->ptr;
+
+	if (direction == DMA_OUT) {
+		unsigned int word;
+		while (length > 256) {
+			if (readb(base + 0x80) & STAT_INT) {
+				error = 1;
+				break;
+			}
+			arxescsi_pseudo_dma_write(addr, base);
+			addr += 256;
+			length -= 256;
+		}
+
+		if (!error)
+			while (length > 0) {
+				if (readb(base + 0x80) & STAT_INT)
+					break;
+	 
+				if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
+					continue;
+
+				word = *addr | *(addr + 1) << 8;
+
+				writew(word, base + DMADATA_OFFSET);
+				if (length > 1) {
+					addr += 2;
+					length -= 2;
+				} else {
+					addr += 1;
+					length -= 1;
+				}
+			}
+	}
+	else {
+		if (transfer && (transfer & 255)) {
+			while (length >= 256) {
+				if (readb(base + 0x80) & STAT_INT) {
+					error = 1;
+					break;
+				}
+	    
+				if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
+					continue;
+
+				readsw(base + DMADATA_OFFSET, addr, 256 >> 1);
+				addr += 256;
+				length -= 256;
+			}
+		}
+
+		if (!(error))
+			while (length > 0) {
+				unsigned long word;
+
+				if (readb(base + 0x80) & STAT_INT)
+					break;
+
+				if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
+					continue;
+
+				word = readw(base + DMADATA_OFFSET);
+				*addr++ = word;
+				if (--length > 0) {
+					*addr++ = word >> 8;
+					length --;
+				}
+			}
+	}
+}
+
+/*
+ * Function: int arxescsi_dma_stop(host, SCpnt)
+ * Purpose : stops DMA/PIO
+ * Params  : host  - host
+ *	     SCpnt - command
+ */
+static void arxescsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
+{
+	/*
+	 * no DMA to stop
+	 */
+}
+
+/*
+ * Function: const char *arxescsi_info(struct Scsi_Host * host)
+ * Purpose : returns a descriptive string about this interface,
+ * Params  : host - driver host structure to return info for.
+ * Returns : pointer to a static buffer containing null terminated string.
+ */
+static const char *arxescsi_info(struct Scsi_Host *host)
+{
+	struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
+	static char string[150];
+
+	sprintf(string, "%s (%s) in slot %d v%s",
+		host->hostt->name, info->info.scsi.type, info->ec->slot_no,
+		VERSION);
+
+	return string;
+}
+
+static int
+arxescsi_show_info(struct seq_file *m, struct Scsi_Host *host)
+{
+	struct arxescsi_info *info;
+	info = (struct arxescsi_info *)host->hostdata;
+
+	seq_printf(m, "ARXE 16-bit SCSI driver v%s\n", VERSION);
+	fas216_print_host(&info->info, m);
+	fas216_print_stats(&info->info, m);
+	fas216_print_devices(&info->info, m);
+	return 0;
+}
+
+static struct scsi_host_template arxescsi_template = {
+	.show_info			= arxescsi_show_info,
+	.name				= "ARXE SCSI card",
+	.info				= arxescsi_info,
+	.queuecommand			= fas216_noqueue_command,
+	.eh_host_reset_handler		= fas216_eh_host_reset,
+	.eh_bus_reset_handler		= fas216_eh_bus_reset,
+	.eh_device_reset_handler	= fas216_eh_device_reset,
+	.eh_abort_handler		= fas216_eh_abort,
+	.cmd_size			= sizeof(struct fas216_cmd_priv),
+	.can_queue			= 0,
+	.this_id			= 7,
+	.sg_tablesize			= SG_ALL,
+	.dma_boundary			= PAGE_SIZE - 1,
+	.proc_name			= "arxescsi",
+};
+
+static int arxescsi_probe(struct expansion_card *ec, const struct ecard_id *id)
+{
+	struct Scsi_Host *host;
+	struct arxescsi_info *info;
+	void __iomem *base;
+	int ret;
+
+	ret = ecard_request_resources(ec);
+	if (ret)
+		goto out;
+
+	base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
+	if (!base) {
+		ret = -ENOMEM;
+		goto out_region;
+	}
+
+	host = scsi_host_alloc(&arxescsi_template, sizeof(struct arxescsi_info));
+	if (!host) {
+		ret = -ENOMEM;
+		goto out_region;
+	}
+
+	info = (struct arxescsi_info *)host->hostdata;
+	info->ec = ec;
+	info->base = base;
+
+	info->info.scsi.io_base		= base + 0x2000;
+	info->info.scsi.irq		= 0;
+	info->info.scsi.dma		= NO_DMA;
+	info->info.scsi.io_shift	= 5;
+	info->info.ifcfg.clockrate	= 24; /* MHz */
+	info->info.ifcfg.select_timeout = 255;
+	info->info.ifcfg.asyncperiod	= 200; /* ns */
+	info->info.ifcfg.sync_max_depth	= 0;
+	info->info.ifcfg.cntl3		= CNTL3_FASTSCSI | CNTL3_FASTCLK;
+	info->info.ifcfg.disconnect_ok	= 0;
+	info->info.ifcfg.wide_max_size	= 0;
+	info->info.ifcfg.capabilities	= FASCAP_PSEUDODMA;
+	info->info.dma.setup		= arxescsi_dma_setup;
+	info->info.dma.pseudo		= arxescsi_dma_pseudo;
+	info->info.dma.stop		= arxescsi_dma_stop;
+		
+	ec->irqaddr = base;
+	ec->irqmask = CSTATUS_IRQ;
+
+	ret = fas216_init(host);
+	if (ret)
+		goto out_unregister;
+
+	ret = fas216_add(host, &ec->dev);
+	if (ret == 0)
+		goto out;
+
+	fas216_release(host);
+ out_unregister:
+	scsi_host_put(host);
+ out_region:
+	ecard_release_resources(ec);
+ out:
+	return ret;
+}
+
+static void arxescsi_remove(struct expansion_card *ec)
+{
+	struct Scsi_Host *host = ecard_get_drvdata(ec);
+
+	ecard_set_drvdata(ec, NULL);
+	fas216_remove(host);
+
+	fas216_release(host);
+	scsi_host_put(host);
+	ecard_release_resources(ec);
+}
+
+static const struct ecard_id arxescsi_cids[] = {
+	{ MANU_ARXE, PROD_ARXE_SCSI },
+	{ 0xffff, 0xffff },
+};
+
+static struct ecard_driver arxescsi_driver = {
+	.probe		= arxescsi_probe,
+	.remove		= arxescsi_remove,
+	.id_table	= arxescsi_cids,
+	.drv = {
+		.name		= "arxescsi",
+	},
+};
+
+static int __init init_arxe_scsi_driver(void)
+{
+	return ecard_register_driver(&arxescsi_driver);
+}
+
+static void __exit exit_arxe_scsi_driver(void)
+{
+	ecard_remove_driver(&arxescsi_driver);
+}
+
+module_init(init_arxe_scsi_driver);
+module_exit(exit_arxe_scsi_driver);
+
+MODULE_AUTHOR("Stefan Hanske");
+MODULE_DESCRIPTION("ARXESCSI driver for Acorn machines");
+MODULE_LICENSE("GPL");
+
diff --git a/drivers/scsi/arm/cumana_1.c b/drivers/scsi/arm/cumana_1.c
new file mode 100644
index 000000000..5d4f67ba7
--- /dev/null
+++ b/drivers/scsi/arm/cumana_1.c
@@ -0,0 +1,341 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Generic Generic NCR5380 driver
+ *
+ * Copyright 1995-2002, Russell King
+ */
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/blkdev.h>
+#include <linux/init.h>
+
+#include <asm/ecard.h>
+#include <asm/io.h>
+
+#include <scsi/scsi_host.h>
+
+#define priv(host)			((struct NCR5380_hostdata *)(host)->hostdata)
+#define NCR5380_read(reg)		cumanascsi_read(hostdata, reg)
+#define NCR5380_write(reg, value)	cumanascsi_write(hostdata, reg, value)
+
+#define NCR5380_dma_xfer_len		cumanascsi_dma_xfer_len
+#define NCR5380_dma_recv_setup		cumanascsi_pread
+#define NCR5380_dma_send_setup		cumanascsi_pwrite
+#define NCR5380_dma_residual		NCR5380_dma_residual_none
+
+#define NCR5380_intr			cumanascsi_intr
+#define NCR5380_queue_command		cumanascsi_queue_command
+#define NCR5380_info			cumanascsi_info
+
+#define NCR5380_implementation_fields	\
+	unsigned ctrl
+
+struct NCR5380_hostdata;
+static u8 cumanascsi_read(struct NCR5380_hostdata *, unsigned int);
+static void cumanascsi_write(struct NCR5380_hostdata *, unsigned int, u8);
+
+#include "../NCR5380.h"
+
+#define CTRL	0x16fc
+#define STAT	0x2004
+#define L(v)	(((v)<<16)|((v) & 0x0000ffff))
+#define H(v)	(((v)>>16)|((v) & 0xffff0000))
+
+static inline int cumanascsi_pwrite(struct NCR5380_hostdata *hostdata,
+                                    unsigned char *addr, int len)
+{
+  unsigned long *laddr;
+  u8 __iomem *base = hostdata->io;
+  u8 __iomem *dma = hostdata->pdma_io + 0x2000;
+
+  if(!len) return 0;
+
+  writeb(0x02, base + CTRL);
+  laddr = (unsigned long *)addr;
+  while(len >= 32)
+  {
+    unsigned int status;
+    unsigned long v;
+    status = readb(base + STAT);
+    if(status & 0x80)
+      goto end;
+    if(!(status & 0x40))
+      continue;
+    v=*laddr++; writew(L(v), dma); writew(H(v), dma);
+    v=*laddr++; writew(L(v), dma); writew(H(v), dma);
+    v=*laddr++; writew(L(v), dma); writew(H(v), dma);
+    v=*laddr++; writew(L(v), dma); writew(H(v), dma);
+    v=*laddr++; writew(L(v), dma); writew(H(v), dma);
+    v=*laddr++; writew(L(v), dma); writew(H(v), dma);
+    v=*laddr++; writew(L(v), dma); writew(H(v), dma);
+    v=*laddr++; writew(L(v), dma); writew(H(v), dma);
+    len -= 32;
+    if(len == 0)
+      break;
+  }
+
+  addr = (unsigned char *)laddr;
+  writeb(0x12, base + CTRL);
+
+  while(len > 0)
+  {
+    unsigned int status;
+    status = readb(base + STAT);
+    if(status & 0x80)
+      goto end;
+    if(status & 0x40)
+    {
+      writeb(*addr++, dma);
+      if(--len == 0)
+        break;
+    }
+
+    status = readb(base + STAT);
+    if(status & 0x80)
+      goto end;
+    if(status & 0x40)
+    {
+      writeb(*addr++, dma);
+      if(--len == 0)
+        break;
+    }
+  }
+end:
+  writeb(hostdata->ctrl | 0x40, base + CTRL);
+
+	if (len)
+		return -1;
+	return 0;
+}
+
+static inline int cumanascsi_pread(struct NCR5380_hostdata *hostdata,
+                                   unsigned char *addr, int len)
+{
+  unsigned long *laddr;
+  u8 __iomem *base = hostdata->io;
+  u8 __iomem *dma = hostdata->pdma_io + 0x2000;
+
+  if(!len) return 0;
+
+  writeb(0x00, base + CTRL);
+  laddr = (unsigned long *)addr;
+  while(len >= 32)
+  {
+    unsigned int status;
+    status = readb(base + STAT);
+    if(status & 0x80)
+      goto end;
+    if(!(status & 0x40))
+      continue;
+    *laddr++ = readw(dma) | (readw(dma) << 16);
+    *laddr++ = readw(dma) | (readw(dma) << 16);
+    *laddr++ = readw(dma) | (readw(dma) << 16);
+    *laddr++ = readw(dma) | (readw(dma) << 16);
+    *laddr++ = readw(dma) | (readw(dma) << 16);
+    *laddr++ = readw(dma) | (readw(dma) << 16);
+    *laddr++ = readw(dma) | (readw(dma) << 16);
+    *laddr++ = readw(dma) | (readw(dma) << 16);
+    len -= 32;
+    if(len == 0)
+      break;
+  }
+
+  addr = (unsigned char *)laddr;
+  writeb(0x10, base + CTRL);
+
+  while(len > 0)
+  {
+    unsigned int status;
+    status = readb(base + STAT);
+    if(status & 0x80)
+      goto end;
+    if(status & 0x40)
+    {
+      *addr++ = readb(dma);
+      if(--len == 0)
+        break;
+    }
+
+    status = readb(base + STAT);
+    if(status & 0x80)
+      goto end;
+    if(status & 0x40)
+    {
+      *addr++ = readb(dma);
+      if(--len == 0)
+        break;
+    }
+  }
+end:
+  writeb(hostdata->ctrl | 0x40, base + CTRL);
+
+	if (len)
+		return -1;
+	return 0;
+}
+
+static int cumanascsi_dma_xfer_len(struct NCR5380_hostdata *hostdata,
+                                   struct scsi_cmnd *cmd)
+{
+	return cmd->transfersize;
+}
+
+static u8 cumanascsi_read(struct NCR5380_hostdata *hostdata,
+                          unsigned int reg)
+{
+	u8 __iomem *base = hostdata->io;
+	u8 val;
+
+	writeb(0, base + CTRL);
+
+	val = readb(base + 0x2100 + (reg << 2));
+
+	hostdata->ctrl = 0x40;
+	writeb(0x40, base + CTRL);
+
+	return val;
+}
+
+static void cumanascsi_write(struct NCR5380_hostdata *hostdata,
+                             unsigned int reg, u8 value)
+{
+	u8 __iomem *base = hostdata->io;
+
+	writeb(0, base + CTRL);
+
+	writeb(value, base + 0x2100 + (reg << 2));
+
+	hostdata->ctrl = 0x40;
+	writeb(0x40, base + CTRL);
+}
+
+#include "../NCR5380.c"
+
+static struct scsi_host_template cumanascsi_template = {
+	.module			= THIS_MODULE,
+	.name			= "Cumana 16-bit SCSI",
+	.info			= cumanascsi_info,
+	.queuecommand		= cumanascsi_queue_command,
+	.eh_abort_handler	= NCR5380_abort,
+	.eh_host_reset_handler	= NCR5380_host_reset,
+	.can_queue		= 16,
+	.this_id		= 7,
+	.sg_tablesize		= SG_ALL,
+	.cmd_per_lun		= 2,
+	.proc_name		= "CumanaSCSI-1",
+	.cmd_size		= sizeof(struct NCR5380_cmd),
+	.max_sectors		= 128,
+	.dma_boundary		= PAGE_SIZE - 1,
+};
+
+static int cumanascsi1_probe(struct expansion_card *ec,
+			     const struct ecard_id *id)
+{
+	struct Scsi_Host *host;
+	int ret;
+
+	ret = ecard_request_resources(ec);
+	if (ret)
+		goto out;
+
+	host = scsi_host_alloc(&cumanascsi_template, sizeof(struct NCR5380_hostdata));
+	if (!host) {
+		ret = -ENOMEM;
+		goto out_release;
+	}
+
+	priv(host)->io = ioremap(ecard_resource_start(ec, ECARD_RES_IOCSLOW),
+	                         ecard_resource_len(ec, ECARD_RES_IOCSLOW));
+	priv(host)->pdma_io = ioremap(ecard_resource_start(ec, ECARD_RES_MEMC),
+	                              ecard_resource_len(ec, ECARD_RES_MEMC));
+	if (!priv(host)->io || !priv(host)->pdma_io) {
+		ret = -ENOMEM;
+		goto out_unmap;
+	}
+
+	host->irq = ec->irq;
+
+	ret = NCR5380_init(host, FLAG_DMA_FIXUP | FLAG_LATE_DMA_SETUP);
+	if (ret)
+		goto out_unmap;
+
+	NCR5380_maybe_reset_bus(host);
+
+        priv(host)->ctrl = 0;
+        writeb(0, priv(host)->io + CTRL);
+
+	ret = request_irq(host->irq, cumanascsi_intr, 0,
+			  "CumanaSCSI-1", host);
+	if (ret) {
+		printk("scsi%d: IRQ%d not free: %d\n",
+		    host->host_no, host->irq, ret);
+		goto out_exit;
+	}
+
+	ret = scsi_add_host(host, &ec->dev);
+	if (ret)
+		goto out_free_irq;
+
+	scsi_scan_host(host);
+	goto out;
+
+ out_free_irq:
+	free_irq(host->irq, host);
+ out_exit:
+	NCR5380_exit(host);
+ out_unmap:
+	iounmap(priv(host)->io);
+	iounmap(priv(host)->pdma_io);
+	scsi_host_put(host);
+ out_release:
+	ecard_release_resources(ec);
+ out:
+	return ret;
+}
+
+static void cumanascsi1_remove(struct expansion_card *ec)
+{
+	struct Scsi_Host *host = ecard_get_drvdata(ec);
+	void __iomem *base = priv(host)->io;
+	void __iomem *dma = priv(host)->pdma_io;
+
+	ecard_set_drvdata(ec, NULL);
+
+	scsi_remove_host(host);
+	free_irq(host->irq, host);
+	NCR5380_exit(host);
+	scsi_host_put(host);
+	iounmap(base);
+	iounmap(dma);
+	ecard_release_resources(ec);
+}
+
+static const struct ecard_id cumanascsi1_cids[] = {
+	{ MANU_CUMANA, PROD_CUMANA_SCSI_1 },
+	{ 0xffff, 0xffff }
+};
+
+static struct ecard_driver cumanascsi1_driver = {
+	.probe		= cumanascsi1_probe,
+	.remove		= cumanascsi1_remove,
+	.id_table	= cumanascsi1_cids,
+	.drv = {
+		.name		= "cumanascsi1",
+	},
+};
+
+static int __init cumanascsi_init(void)
+{
+	return ecard_register_driver(&cumanascsi1_driver);
+}
+
+static void __exit cumanascsi_exit(void)
+{
+	ecard_remove_driver(&cumanascsi1_driver);
+}
+
+module_init(cumanascsi_init);
+module_exit(cumanascsi_exit);
+
+MODULE_DESCRIPTION("Cumana SCSI-1 driver for Acorn machines");
+MODULE_LICENSE("GPL");
diff --git a/drivers/scsi/arm/cumana_2.c b/drivers/scsi/arm/cumana_2.c
new file mode 100644
index 000000000..d15053f02
--- /dev/null
+++ b/drivers/scsi/arm/cumana_2.c
@@ -0,0 +1,524 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  linux/drivers/acorn/scsi/cumana_2.c
+ *
+ *  Copyright (C) 1997-2005 Russell King
+ *
+ *  Changelog:
+ *   30-08-1997	RMK	0.0.0	Created, READONLY version.
+ *   22-01-1998	RMK	0.0.1	Updated to 2.1.80.
+ *   15-04-1998	RMK	0.0.1	Only do PIO if FAS216 will allow it.
+ *   02-05-1998	RMK	0.0.2	Updated & added DMA support.
+ *   27-06-1998	RMK		Changed asm/delay.h to linux/delay.h
+ *   18-08-1998	RMK	0.0.3	Fixed synchronous transfer depth.
+ *   02-04-2000	RMK	0.0.4	Updated for new error handling code.
+ */
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/ioport.h>
+#include <linux/proc_fs.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/dma-mapping.h>
+#include <linux/pgtable.h>
+
+#include <asm/dma.h>
+#include <asm/ecard.h>
+#include <asm/io.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_tcq.h>
+#include "fas216.h"
+#include "arm_scsi.h"
+
+#include <scsi/scsicam.h>
+
+#define CUMANASCSI2_STATUS		(0x0000)
+#define STATUS_INT			(1 << 0)
+#define STATUS_DRQ			(1 << 1)
+#define STATUS_LATCHED			(1 << 3)
+
+#define CUMANASCSI2_ALATCH		(0x0014)
+#define ALATCH_ENA_INT			(3)
+#define ALATCH_DIS_INT			(2)
+#define ALATCH_ENA_TERM			(5)
+#define ALATCH_DIS_TERM			(4)
+#define ALATCH_ENA_BIT32		(11)
+#define ALATCH_DIS_BIT32		(10)
+#define ALATCH_ENA_DMA			(13)
+#define ALATCH_DIS_DMA			(12)
+#define ALATCH_DMA_OUT			(15)
+#define ALATCH_DMA_IN			(14)
+
+#define CUMANASCSI2_PSEUDODMA		(0x0200)
+
+#define CUMANASCSI2_FAS216_OFFSET	(0x0300)
+#define CUMANASCSI2_FAS216_SHIFT	2
+
+/*
+ * Version
+ */
+#define VERSION "1.00 (13/11/2002 2.5.47)"
+
+/*
+ * Use term=0,1,0,0,0 to turn terminators on/off
+ */
+static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
+
+#define NR_SG	256
+
+struct cumanascsi2_info {
+	FAS216_Info		info;
+	struct expansion_card	*ec;
+	void __iomem		*base;
+	unsigned int		terms;		/* Terminator state	*/
+	struct scatterlist	sg[NR_SG];	/* Scatter DMA list	*/
+};
+
+#define CSTATUS_IRQ	(1 << 0)
+#define CSTATUS_DRQ	(1 << 1)
+
+/* Prototype: void cumanascsi_2_irqenable(ec, irqnr)
+ * Purpose  : Enable interrupts on Cumana SCSI 2 card
+ * Params   : ec    - expansion card structure
+ *          : irqnr - interrupt number
+ */
+static void
+cumanascsi_2_irqenable(struct expansion_card *ec, int irqnr)
+{
+	struct cumanascsi2_info *info = ec->irq_data;
+	writeb(ALATCH_ENA_INT, info->base + CUMANASCSI2_ALATCH);
+}
+
+/* Prototype: void cumanascsi_2_irqdisable(ec, irqnr)
+ * Purpose  : Disable interrupts on Cumana SCSI 2 card
+ * Params   : ec    - expansion card structure
+ *          : irqnr - interrupt number
+ */
+static void
+cumanascsi_2_irqdisable(struct expansion_card *ec, int irqnr)
+{
+	struct cumanascsi2_info *info = ec->irq_data;
+	writeb(ALATCH_DIS_INT, info->base + CUMANASCSI2_ALATCH);
+}
+
+static const expansioncard_ops_t cumanascsi_2_ops = {
+	.irqenable	= cumanascsi_2_irqenable,
+	.irqdisable	= cumanascsi_2_irqdisable,
+};
+
+/* Prototype: void cumanascsi_2_terminator_ctl(host, on_off)
+ * Purpose  : Turn the Cumana SCSI 2 terminators on or off
+ * Params   : host   - card to turn on/off
+ *          : on_off - !0 to turn on, 0 to turn off
+ */
+static void
+cumanascsi_2_terminator_ctl(struct Scsi_Host *host, int on_off)
+{
+	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
+
+	if (on_off) {
+		info->terms = 1;
+		writeb(ALATCH_ENA_TERM, info->base + CUMANASCSI2_ALATCH);
+	} else {
+		info->terms = 0;
+		writeb(ALATCH_DIS_TERM, info->base + CUMANASCSI2_ALATCH);
+	}
+}
+
+/* Prototype: void cumanascsi_2_intr(irq, *dev_id, *regs)
+ * Purpose  : handle interrupts from Cumana SCSI 2 card
+ * Params   : irq    - interrupt number
+ *	      dev_id - user-defined (Scsi_Host structure)
+ */
+static irqreturn_t
+cumanascsi_2_intr(int irq, void *dev_id)
+{
+	struct cumanascsi2_info *info = dev_id;
+
+	return fas216_intr(&info->info);
+}
+
+/* Prototype: fasdmatype_t cumanascsi_2_dma_setup(host, SCpnt, direction, min_type)
+ * Purpose  : initialises DMA/PIO
+ * Params   : host      - host
+ *	      SCpnt     - command
+ *	      direction - DMA on to/off of card
+ *	      min_type  - minimum DMA support that we must have for this transfer
+ * Returns  : type of transfer to be performed
+ */
+static fasdmatype_t
+cumanascsi_2_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
+		       fasdmadir_t direction, fasdmatype_t min_type)
+{
+	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
+	struct device *dev = scsi_get_device(host);
+	int dmach = info->info.scsi.dma;
+
+	writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);
+
+	if (dmach != NO_DMA &&
+	    (min_type == fasdma_real_all || SCp->this_residual >= 512)) {
+		int bufs, map_dir, dma_dir, alatch_dir;
+
+		bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
+
+		if (direction == DMA_OUT) {
+			map_dir = DMA_TO_DEVICE;
+			dma_dir = DMA_MODE_WRITE;
+			alatch_dir = ALATCH_DMA_OUT;
+		} else {
+			map_dir = DMA_FROM_DEVICE;
+			dma_dir = DMA_MODE_READ;
+			alatch_dir = ALATCH_DMA_IN;
+		}
+
+		dma_map_sg(dev, info->sg, bufs, map_dir);
+
+		disable_dma(dmach);
+		set_dma_sg(dmach, info->sg, bufs);
+		writeb(alatch_dir, info->base + CUMANASCSI2_ALATCH);
+		set_dma_mode(dmach, dma_dir);
+		enable_dma(dmach);
+		writeb(ALATCH_ENA_DMA, info->base + CUMANASCSI2_ALATCH);
+		writeb(ALATCH_DIS_BIT32, info->base + CUMANASCSI2_ALATCH);
+		return fasdma_real_all;
+	}
+
+	/*
+	 * If we're not doing DMA,
+	 *  we'll do pseudo DMA
+	 */
+	return fasdma_pio;
+}
+
+/*
+ * Prototype: void cumanascsi_2_dma_pseudo(host, SCpnt, direction, transfer)
+ * Purpose  : handles pseudo DMA
+ * Params   : host      - host
+ *	      SCpnt     - command
+ *	      direction - DMA on to/off of card
+ *	      transfer  - minimum number of bytes we expect to transfer
+ */
+static void
+cumanascsi_2_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
+			fasdmadir_t direction, int transfer)
+{
+	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
+	unsigned int length;
+	unsigned char *addr;
+
+	length = SCp->this_residual;
+	addr = SCp->ptr;
+
+	if (direction == DMA_OUT)
+#if 0
+		while (length > 1) {
+			unsigned long word;
+			unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
+
+			if (status & STATUS_INT)
+				goto end;
+
+			if (!(status & STATUS_DRQ))
+				continue;
+
+			word = *addr | *(addr + 1) << 8;
+			writew(word, info->base + CUMANASCSI2_PSEUDODMA);
+			addr += 2;
+			length -= 2;
+		}
+#else
+		printk ("PSEUDO_OUT???\n");
+#endif
+	else {
+		if (transfer && (transfer & 255)) {
+			while (length >= 256) {
+				unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
+
+				if (status & STATUS_INT)
+					return;
+	    
+				if (!(status & STATUS_DRQ))
+					continue;
+
+				readsw(info->base + CUMANASCSI2_PSEUDODMA,
+				       addr, 256 >> 1);
+				addr += 256;
+				length -= 256;
+			}
+		}
+
+		while (length > 0) {
+			unsigned long word;
+			unsigned int status = readb(info->base + CUMANASCSI2_STATUS);
+
+			if (status & STATUS_INT)
+				return;
+
+			if (!(status & STATUS_DRQ))
+				continue;
+
+			word = readw(info->base + CUMANASCSI2_PSEUDODMA);
+			*addr++ = word;
+			if (--length > 0) {
+				*addr++ = word >> 8;
+				length --;
+			}
+		}
+	}
+}
+
+/* Prototype: int cumanascsi_2_dma_stop(host, SCpnt)
+ * Purpose  : stops DMA/PIO
+ * Params   : host  - host
+ *	      SCpnt - command
+ */
+static void
+cumanascsi_2_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
+{
+	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
+	if (info->info.scsi.dma != NO_DMA) {
+		writeb(ALATCH_DIS_DMA, info->base + CUMANASCSI2_ALATCH);
+		disable_dma(info->info.scsi.dma);
+	}
+}
+
+/* Prototype: const char *cumanascsi_2_info(struct Scsi_Host * host)
+ * Purpose  : returns a descriptive string about this interface,
+ * Params   : host - driver host structure to return info for.
+ * Returns  : pointer to a static buffer containing null terminated string.
+ */
+const char *cumanascsi_2_info(struct Scsi_Host *host)
+{
+	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
+	static char string[150];
+
+	sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
+		host->hostt->name, info->info.scsi.type, info->ec->slot_no,
+		VERSION, info->terms ? "n" : "ff");
+
+	return string;
+}
+
+/* Prototype: int cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
+ * Purpose  : Set a driver specific function
+ * Params   : host   - host to setup
+ *          : buffer - buffer containing string describing operation
+ *          : length - length of string
+ * Returns  : -EINVAL, or 0
+ */
+static int
+cumanascsi_2_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
+{
+	int ret = length;
+
+	if (length >= 11 && strncmp(buffer, "CUMANASCSI2", 11) == 0) {
+		buffer += 11;
+		length -= 11;
+
+		if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
+			if (buffer[5] == '1')
+				cumanascsi_2_terminator_ctl(host, 1);
+			else if (buffer[5] == '0')
+				cumanascsi_2_terminator_ctl(host, 0);
+			else
+				ret = -EINVAL;
+		} else {
+			ret = -EINVAL;
+		}
+	} else {
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static int cumanascsi_2_show_info(struct seq_file *m, struct Scsi_Host *host)
+{
+	struct cumanascsi2_info *info;
+	info = (struct cumanascsi2_info *)host->hostdata;
+
+	seq_printf(m, "Cumana SCSI II driver v%s\n", VERSION);
+	fas216_print_host(&info->info, m);
+	seq_printf(m, "Term    : o%s\n",
+			info->terms ? "n" : "ff");
+
+	fas216_print_stats(&info->info, m);
+	fas216_print_devices(&info->info, m);
+	return 0;
+}
+
+static struct scsi_host_template cumanascsi2_template = {
+	.module				= THIS_MODULE,
+	.show_info			= cumanascsi_2_show_info,
+	.write_info			= cumanascsi_2_set_proc_info,
+	.name				= "Cumana SCSI II",
+	.info				= cumanascsi_2_info,
+	.queuecommand			= fas216_queue_command,
+	.eh_host_reset_handler		= fas216_eh_host_reset,
+	.eh_bus_reset_handler		= fas216_eh_bus_reset,
+	.eh_device_reset_handler	= fas216_eh_device_reset,
+	.eh_abort_handler		= fas216_eh_abort,
+	.cmd_size			= sizeof(struct fas216_cmd_priv),
+	.can_queue			= 1,
+	.this_id			= 7,
+	.sg_tablesize			= SG_MAX_SEGMENTS,
+	.dma_boundary			= IOMD_DMA_BOUNDARY,
+	.proc_name			= "cumanascsi2",
+};
+
+static int cumanascsi2_probe(struct expansion_card *ec,
+			     const struct ecard_id *id)
+{
+	struct Scsi_Host *host;
+	struct cumanascsi2_info *info;
+	void __iomem *base;
+	int ret;
+
+	ret = ecard_request_resources(ec);
+	if (ret)
+		goto out;
+
+	base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
+	if (!base) {
+		ret = -ENOMEM;
+		goto out_region;
+	}
+
+	host = scsi_host_alloc(&cumanascsi2_template,
+			       sizeof(struct cumanascsi2_info));
+	if (!host) {
+		ret = -ENOMEM;
+		goto out_region;
+	}
+
+	ecard_set_drvdata(ec, host);
+
+	info = (struct cumanascsi2_info *)host->hostdata;
+	info->ec	= ec;
+	info->base	= base;
+
+	cumanascsi_2_terminator_ctl(host, term[ec->slot_no]);
+
+	info->info.scsi.io_base		= base + CUMANASCSI2_FAS216_OFFSET;
+	info->info.scsi.io_shift	= CUMANASCSI2_FAS216_SHIFT;
+	info->info.scsi.irq		= ec->irq;
+	info->info.scsi.dma		= ec->dma;
+	info->info.ifcfg.clockrate	= 40; /* MHz */
+	info->info.ifcfg.select_timeout	= 255;
+	info->info.ifcfg.asyncperiod	= 200; /* ns */
+	info->info.ifcfg.sync_max_depth	= 7;
+	info->info.ifcfg.cntl3		= CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
+	info->info.ifcfg.disconnect_ok	= 1;
+	info->info.ifcfg.wide_max_size	= 0;
+	info->info.ifcfg.capabilities	= FASCAP_PSEUDODMA;
+	info->info.dma.setup		= cumanascsi_2_dma_setup;
+	info->info.dma.pseudo		= cumanascsi_2_dma_pseudo;
+	info->info.dma.stop		= cumanascsi_2_dma_stop;
+
+	ec->irqaddr	= info->base + CUMANASCSI2_STATUS;
+	ec->irqmask	= STATUS_INT;
+
+	ecard_setirq(ec, &cumanascsi_2_ops, info);
+
+	ret = fas216_init(host);
+	if (ret)
+		goto out_free;
+
+	ret = request_irq(ec->irq, cumanascsi_2_intr,
+			  0, "cumanascsi2", info);
+	if (ret) {
+		printk("scsi%d: IRQ%d not free: %d\n",
+		       host->host_no, ec->irq, ret);
+		goto out_release;
+	}
+
+	if (info->info.scsi.dma != NO_DMA) {
+		if (request_dma(info->info.scsi.dma, "cumanascsi2")) {
+			printk("scsi%d: DMA%d not free, using PIO\n",
+			       host->host_no, info->info.scsi.dma);
+			info->info.scsi.dma = NO_DMA;
+		} else {
+			set_dma_speed(info->info.scsi.dma, 180);
+			info->info.ifcfg.capabilities |= FASCAP_DMA;
+		}
+	}
+
+	ret = fas216_add(host, &ec->dev);
+	if (ret == 0)
+		goto out;
+
+	if (info->info.scsi.dma != NO_DMA)
+		free_dma(info->info.scsi.dma);
+	free_irq(ec->irq, info);
+
+ out_release:
+	fas216_release(host);
+
+ out_free:
+	scsi_host_put(host);
+
+ out_region:
+	ecard_release_resources(ec);
+
+ out:
+	return ret;
+}
+
+static void cumanascsi2_remove(struct expansion_card *ec)
+{
+	struct Scsi_Host *host = ecard_get_drvdata(ec);
+	struct cumanascsi2_info *info = (struct cumanascsi2_info *)host->hostdata;
+
+	ecard_set_drvdata(ec, NULL);
+	fas216_remove(host);
+
+	if (info->info.scsi.dma != NO_DMA)
+		free_dma(info->info.scsi.dma);
+	free_irq(ec->irq, info);
+
+	fas216_release(host);
+	scsi_host_put(host);
+	ecard_release_resources(ec);
+}
+
+static const struct ecard_id cumanascsi2_cids[] = {
+	{ MANU_CUMANA, PROD_CUMANA_SCSI_2 },
+	{ 0xffff, 0xffff },
+};
+
+static struct ecard_driver cumanascsi2_driver = {
+	.probe		= cumanascsi2_probe,
+	.remove		= cumanascsi2_remove,
+	.id_table	= cumanascsi2_cids,
+	.drv = {
+		.name		= "cumanascsi2",
+	},
+};
+
+static int __init cumanascsi2_init(void)
+{
+	return ecard_register_driver(&cumanascsi2_driver);
+}
+
+static void __exit cumanascsi2_exit(void)
+{
+	ecard_remove_driver(&cumanascsi2_driver);
+}
+
+module_init(cumanascsi2_init);
+module_exit(cumanascsi2_exit);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("Cumana SCSI-2 driver for Acorn machines");
+module_param_array(term, int, NULL, 0);
+MODULE_PARM_DESC(term, "SCSI bus termination");
+MODULE_LICENSE("GPL");
diff --git a/drivers/scsi/arm/eesox.c b/drivers/scsi/arm/eesox.c
new file mode 100644
index 000000000..6f374af9f
--- /dev/null
+++ b/drivers/scsi/arm/eesox.c
@@ -0,0 +1,646 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  linux/drivers/acorn/scsi/eesox.c
+ *
+ *  Copyright (C) 1997-2005 Russell King
+ *
+ *  This driver is based on experimentation.  Hence, it may have made
+ *  assumptions about the particular card that I have available, and
+ *  may not be reliable!
+ *
+ *  Changelog:
+ *   01-10-1997	RMK		Created, READONLY version
+ *   15-02-1998	RMK		READ/WRITE version
+ *				added DMA support and hardware definitions
+ *   14-03-1998	RMK		Updated DMA support
+ *				Added terminator control
+ *   15-04-1998	RMK		Only do PIO if FAS216 will allow it.
+ *   27-06-1998	RMK		Changed asm/delay.h to linux/delay.h
+ *   02-04-2000	RMK	0.0.3	Fixed NO_IRQ/NO_DMA problem, updated for new
+ *				error handling code.
+ */
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/ioport.h>
+#include <linux/proc_fs.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/dma-mapping.h>
+#include <linux/pgtable.h>
+
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <asm/ecard.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_tcq.h>
+#include "fas216.h"
+#include "arm_scsi.h"
+
+#include <scsi/scsicam.h>
+
+#define EESOX_FAS216_OFFSET	0x3000
+#define EESOX_FAS216_SHIFT	5
+
+#define EESOX_DMASTAT		0x2800
+#define EESOX_STAT_INTR		0x01
+#define EESOX_STAT_DMA		0x02
+
+#define EESOX_CONTROL		0x2800
+#define EESOX_INTR_ENABLE	0x04
+#define EESOX_TERM_ENABLE	0x02
+#define EESOX_RESET		0x01
+
+#define EESOX_DMADATA		0x3800
+
+#define VERSION "1.10 (17/01/2003 2.5.59)"
+
+/*
+ * Use term=0,1,0,0,0 to turn terminators on/off
+ */
+static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
+
+#define NR_SG	256
+
+struct eesoxscsi_info {
+	FAS216_Info		info;
+	struct expansion_card	*ec;
+	void __iomem		*base;
+	void __iomem		*ctl_port;
+	unsigned int		control;
+	struct scatterlist	sg[NR_SG];	/* Scatter DMA list	*/
+};
+
+/* Prototype: void eesoxscsi_irqenable(ec, irqnr)
+ * Purpose  : Enable interrupts on EESOX SCSI card
+ * Params   : ec    - expansion card structure
+ *          : irqnr - interrupt number
+ */
+static void
+eesoxscsi_irqenable(struct expansion_card *ec, int irqnr)
+{
+	struct eesoxscsi_info *info = (struct eesoxscsi_info *)ec->irq_data;
+
+	info->control |= EESOX_INTR_ENABLE;
+
+	writeb(info->control, info->ctl_port);
+}
+
+/* Prototype: void eesoxscsi_irqdisable(ec, irqnr)
+ * Purpose  : Disable interrupts on EESOX SCSI card
+ * Params   : ec    - expansion card structure
+ *          : irqnr - interrupt number
+ */
+static void
+eesoxscsi_irqdisable(struct expansion_card *ec, int irqnr)
+{
+	struct eesoxscsi_info *info = (struct eesoxscsi_info *)ec->irq_data;
+
+	info->control &= ~EESOX_INTR_ENABLE;
+
+	writeb(info->control, info->ctl_port);
+}
+
+static const expansioncard_ops_t eesoxscsi_ops = {
+	.irqenable	= eesoxscsi_irqenable,
+	.irqdisable	= eesoxscsi_irqdisable,
+};
+
+/* Prototype: void eesoxscsi_terminator_ctl(*host, on_off)
+ * Purpose  : Turn the EESOX SCSI terminators on or off
+ * Params   : host   - card to turn on/off
+ *          : on_off - !0 to turn on, 0 to turn off
+ */
+static void
+eesoxscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
+{
+	struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
+	unsigned long flags;
+
+	spin_lock_irqsave(host->host_lock, flags);
+	if (on_off)
+		info->control |= EESOX_TERM_ENABLE;
+	else
+		info->control &= ~EESOX_TERM_ENABLE;
+
+	writeb(info->control, info->ctl_port);
+	spin_unlock_irqrestore(host->host_lock, flags);
+}
+
+/* Prototype: void eesoxscsi_intr(irq, *dev_id, *regs)
+ * Purpose  : handle interrupts from EESOX SCSI card
+ * Params   : irq    - interrupt number
+ *	      dev_id - user-defined (Scsi_Host structure)
+ */
+static irqreturn_t
+eesoxscsi_intr(int irq, void *dev_id)
+{
+	struct eesoxscsi_info *info = dev_id;
+
+	return fas216_intr(&info->info);
+}
+
+/* Prototype: fasdmatype_t eesoxscsi_dma_setup(host, SCpnt, direction, min_type)
+ * Purpose  : initialises DMA/PIO
+ * Params   : host      - host
+ *	      SCpnt     - command
+ *	      direction - DMA on to/off of card
+ *	      min_type  - minimum DMA support that we must have for this transfer
+ * Returns  : type of transfer to be performed
+ */
+static fasdmatype_t
+eesoxscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
+		       fasdmadir_t direction, fasdmatype_t min_type)
+{
+	struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
+	struct device *dev = scsi_get_device(host);
+	int dmach = info->info.scsi.dma;
+
+	if (dmach != NO_DMA &&
+	    (min_type == fasdma_real_all || SCp->this_residual >= 512)) {
+		int bufs, map_dir, dma_dir;
+
+		bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
+
+		if (direction == DMA_OUT) {
+			map_dir = DMA_TO_DEVICE;
+			dma_dir = DMA_MODE_WRITE;
+		} else {
+			map_dir = DMA_FROM_DEVICE;
+			dma_dir = DMA_MODE_READ;
+		}
+
+		dma_map_sg(dev, info->sg, bufs, map_dir);
+
+		disable_dma(dmach);
+		set_dma_sg(dmach, info->sg, bufs);
+		set_dma_mode(dmach, dma_dir);
+		enable_dma(dmach);
+		return fasdma_real_all;
+	}
+	/*
+	 * We don't do DMA, we only do slow PIO
+	 *
+	 * Some day, we will do Pseudo DMA
+	 */
+	return fasdma_pseudo;
+}
+
+static void eesoxscsi_buffer_in(void *buf, int length, void __iomem *base)
+{
+	const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
+	const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
+	const void __iomem *reg_dmadata = base + EESOX_DMADATA;
+	register const unsigned long mask = 0xffff;
+
+	do {
+		unsigned int status;
+
+		/*
+		 * Interrupt request?
+		 */
+		status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
+		if (status & STAT_INT)
+			break;
+
+		/*
+		 * DMA request active?
+		 */
+		status = readb(reg_dmastat);
+		if (!(status & EESOX_STAT_DMA))
+			continue;
+
+		/*
+		 * Get number of bytes in FIFO
+		 */
+		status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
+		if (status > 16)
+			status = 16;
+		if (status > length)
+			status = length;
+
+		/*
+		 * Align buffer.
+		 */
+		if (((u32)buf) & 2 && status >= 2) {
+			*(u16 *)buf = readl(reg_dmadata);
+			buf += 2;
+			status -= 2;
+			length -= 2;
+		}
+
+		if (status >= 8) {
+			unsigned long l1, l2;
+
+			l1 = readl(reg_dmadata) & mask;
+			l1 |= readl(reg_dmadata) << 16;
+			l2 = readl(reg_dmadata) & mask;
+			l2 |= readl(reg_dmadata) << 16;
+			*(u32 *)buf = l1;
+			buf += 4;
+			*(u32 *)buf = l2;
+			buf += 4;
+			length -= 8;
+			continue;
+		}
+
+		if (status >= 4) {
+			unsigned long l1;
+
+			l1 = readl(reg_dmadata) & mask;
+			l1 |= readl(reg_dmadata) << 16;
+
+			*(u32 *)buf = l1;
+			buf += 4;
+			length -= 4;
+			continue;
+		}
+
+		if (status >= 2) {
+			*(u16 *)buf = readl(reg_dmadata);
+			buf += 2;
+			length -= 2;
+		}
+	} while (length);
+}
+
+static void eesoxscsi_buffer_out(void *buf, int length, void __iomem *base)
+{
+	const void __iomem *reg_fas = base + EESOX_FAS216_OFFSET;
+	const void __iomem *reg_dmastat = base + EESOX_DMASTAT;
+	void __iomem *reg_dmadata = base + EESOX_DMADATA;
+
+	do {
+		unsigned int status;
+
+		/*
+		 * Interrupt request?
+		 */
+		status = readb(reg_fas + (REG_STAT << EESOX_FAS216_SHIFT));
+		if (status & STAT_INT)
+			break;
+
+		/*
+		 * DMA request active?
+		 */
+		status = readb(reg_dmastat);
+		if (!(status & EESOX_STAT_DMA))
+			continue;
+
+		/*
+		 * Get number of bytes in FIFO
+		 */
+		status = readb(reg_fas + (REG_CFIS << EESOX_FAS216_SHIFT)) & CFIS_CF;
+		if (status > 16)
+			status = 16;
+		status = 16 - status;
+		if (status > length)
+			status = length;
+		status &= ~1;
+
+		/*
+		 * Align buffer.
+		 */
+		if (((u32)buf) & 2 && status >= 2) {
+			writel(*(u16 *)buf << 16, reg_dmadata);
+			buf += 2;
+			status -= 2;
+			length -= 2;
+		}
+
+		if (status >= 8) {
+			unsigned long l1, l2;
+
+			l1 = *(u32 *)buf;
+			buf += 4;
+			l2 = *(u32 *)buf;
+			buf += 4;
+
+			writel(l1 << 16, reg_dmadata);
+			writel(l1, reg_dmadata);
+			writel(l2 << 16, reg_dmadata);
+			writel(l2, reg_dmadata);
+			length -= 8;
+			continue;
+		}
+
+		if (status >= 4) {
+			unsigned long l1;
+
+			l1 = *(u32 *)buf;
+			buf += 4;
+
+			writel(l1 << 16, reg_dmadata);
+			writel(l1, reg_dmadata);
+			length -= 4;
+			continue;
+		}
+
+		if (status >= 2) {
+			writel(*(u16 *)buf << 16, reg_dmadata);
+			buf += 2;
+			length -= 2;
+		}
+	} while (length);
+}
+
+static void
+eesoxscsi_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
+		     fasdmadir_t dir, int transfer_size)
+{
+	struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
+	if (dir == DMA_IN) {
+		eesoxscsi_buffer_in(SCp->ptr, SCp->this_residual, info->base);
+	} else {
+		eesoxscsi_buffer_out(SCp->ptr, SCp->this_residual, info->base);
+	}
+}
+
+/* Prototype: int eesoxscsi_dma_stop(host, SCpnt)
+ * Purpose  : stops DMA/PIO
+ * Params   : host  - host
+ *	      SCpnt - command
+ */
+static void
+eesoxscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
+{
+	struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
+	if (info->info.scsi.dma != NO_DMA)
+		disable_dma(info->info.scsi.dma);
+}
+
+/* Prototype: const char *eesoxscsi_info(struct Scsi_Host * host)
+ * Purpose  : returns a descriptive string about this interface,
+ * Params   : host - driver host structure to return info for.
+ * Returns  : pointer to a static buffer containing null terminated string.
+ */
+const char *eesoxscsi_info(struct Scsi_Host *host)
+{
+	struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
+	static char string[150];
+
+	sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
+		host->hostt->name, info->info.scsi.type, info->ec->slot_no,
+		VERSION, info->control & EESOX_TERM_ENABLE ? "n" : "ff");
+
+	return string;
+}
+
+/* Prototype: int eesoxscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
+ * Purpose  : Set a driver specific function
+ * Params   : host   - host to setup
+ *          : buffer - buffer containing string describing operation
+ *          : length - length of string
+ * Returns  : -EINVAL, or 0
+ */
+static int
+eesoxscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
+{
+	int ret = length;
+
+	if (length >= 9 && strncmp(buffer, "EESOXSCSI", 9) == 0) {
+		buffer += 9;
+		length -= 9;
+
+		if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
+			if (buffer[5] == '1')
+				eesoxscsi_terminator_ctl(host, 1);
+			else if (buffer[5] == '0')
+				eesoxscsi_terminator_ctl(host, 0);
+			else
+				ret = -EINVAL;
+		} else
+			ret = -EINVAL;
+	} else
+		ret = -EINVAL;
+
+	return ret;
+}
+
+static int eesoxscsi_show_info(struct seq_file *m, struct Scsi_Host *host)
+{
+	struct eesoxscsi_info *info;
+
+	info = (struct eesoxscsi_info *)host->hostdata;
+
+	seq_printf(m, "EESOX SCSI driver v%s\n", VERSION);
+	fas216_print_host(&info->info, m);
+	seq_printf(m, "Term    : o%s\n",
+			info->control & EESOX_TERM_ENABLE ? "n" : "ff");
+
+	fas216_print_stats(&info->info, m);
+	fas216_print_devices(&info->info, m);
+	return 0;
+}
+
+static ssize_t eesoxscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct expansion_card *ec = ECARD_DEV(dev);
+	struct Scsi_Host *host = ecard_get_drvdata(ec);
+	struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
+
+	return sprintf(buf, "%d\n", info->control & EESOX_TERM_ENABLE ? 1 : 0);
+}
+
+static ssize_t eesoxscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
+{
+	struct expansion_card *ec = ECARD_DEV(dev);
+	struct Scsi_Host *host = ecard_get_drvdata(ec);
+	struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
+	unsigned long flags;
+
+	if (len > 1) {
+		spin_lock_irqsave(host->host_lock, flags);
+		if (buf[0] != '0') {
+			info->control |= EESOX_TERM_ENABLE;
+		} else {
+			info->control &= ~EESOX_TERM_ENABLE;
+		}
+		writeb(info->control, info->ctl_port);
+		spin_unlock_irqrestore(host->host_lock, flags);
+	}
+
+	return len;
+}
+
+static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
+		   eesoxscsi_show_term, eesoxscsi_store_term);
+
+static struct scsi_host_template eesox_template = {
+	.module				= THIS_MODULE,
+	.show_info			= eesoxscsi_show_info,
+	.write_info			= eesoxscsi_set_proc_info,
+	.name				= "EESOX SCSI",
+	.info				= eesoxscsi_info,
+	.queuecommand			= fas216_queue_command,
+	.eh_host_reset_handler		= fas216_eh_host_reset,
+	.eh_bus_reset_handler		= fas216_eh_bus_reset,
+	.eh_device_reset_handler	= fas216_eh_device_reset,
+	.eh_abort_handler		= fas216_eh_abort,
+	.cmd_size			= sizeof(struct fas216_cmd_priv),
+	.can_queue			= 1,
+	.this_id			= 7,
+	.sg_tablesize			= SG_MAX_SEGMENTS,
+	.dma_boundary			= IOMD_DMA_BOUNDARY,
+	.proc_name			= "eesox",
+};
+
+static int eesoxscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
+{
+	struct Scsi_Host *host;
+	struct eesoxscsi_info *info;
+	void __iomem *base;
+	int ret;
+
+	ret = ecard_request_resources(ec);
+	if (ret)
+		goto out;
+
+	base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
+	if (!base) {
+		ret = -ENOMEM;
+		goto out_region;
+	}
+
+	host = scsi_host_alloc(&eesox_template,
+			       sizeof(struct eesoxscsi_info));
+	if (!host) {
+		ret = -ENOMEM;
+		goto out_region;
+	}
+
+	ecard_set_drvdata(ec, host);
+
+	info = (struct eesoxscsi_info *)host->hostdata;
+	info->ec	= ec;
+	info->base	= base;
+	info->ctl_port	= base + EESOX_CONTROL;
+	info->control	= term[ec->slot_no] ? EESOX_TERM_ENABLE : 0;
+	writeb(info->control, info->ctl_port);
+
+	info->info.scsi.io_base		= base + EESOX_FAS216_OFFSET;
+	info->info.scsi.io_shift	= EESOX_FAS216_SHIFT;
+	info->info.scsi.irq		= ec->irq;
+	info->info.scsi.dma		= ec->dma;
+	info->info.ifcfg.clockrate	= 40; /* MHz */
+	info->info.ifcfg.select_timeout	= 255;
+	info->info.ifcfg.asyncperiod	= 200; /* ns */
+	info->info.ifcfg.sync_max_depth	= 7;
+	info->info.ifcfg.cntl3		= CNTL3_FASTSCSI | CNTL3_FASTCLK;
+	info->info.ifcfg.disconnect_ok	= 1;
+	info->info.ifcfg.wide_max_size	= 0;
+	info->info.ifcfg.capabilities	= FASCAP_PSEUDODMA;
+	info->info.dma.setup		= eesoxscsi_dma_setup;
+	info->info.dma.pseudo		= eesoxscsi_dma_pseudo;
+	info->info.dma.stop		= eesoxscsi_dma_stop;
+
+	ec->irqaddr	= base + EESOX_DMASTAT;
+	ec->irqmask	= EESOX_STAT_INTR;
+
+	ecard_setirq(ec, &eesoxscsi_ops, info);
+
+	device_create_file(&ec->dev, &dev_attr_bus_term);
+
+	ret = fas216_init(host);
+	if (ret)
+		goto out_free;
+
+	ret = request_irq(ec->irq, eesoxscsi_intr, 0, "eesoxscsi", info);
+	if (ret) {
+		printk("scsi%d: IRQ%d not free: %d\n",
+		       host->host_no, ec->irq, ret);
+		goto out_remove;
+	}
+
+	if (info->info.scsi.dma != NO_DMA) {
+		if (request_dma(info->info.scsi.dma, "eesox")) {
+			printk("scsi%d: DMA%d not free, DMA disabled\n",
+			       host->host_no, info->info.scsi.dma);
+			info->info.scsi.dma = NO_DMA;
+		} else {
+			set_dma_speed(info->info.scsi.dma, 180);
+			info->info.ifcfg.capabilities |= FASCAP_DMA;
+			info->info.ifcfg.cntl3 |= CNTL3_BS8;
+		}
+	}
+
+	ret = fas216_add(host, &ec->dev);
+	if (ret == 0)
+		goto out;
+
+	if (info->info.scsi.dma != NO_DMA)
+		free_dma(info->info.scsi.dma);
+	free_irq(ec->irq, info);
+
+ out_remove:
+	fas216_remove(host);
+
+ out_free:
+	device_remove_file(&ec->dev, &dev_attr_bus_term);
+	scsi_host_put(host);
+
+ out_region:
+	ecard_release_resources(ec);
+
+ out:
+	return ret;
+}
+
+static void eesoxscsi_remove(struct expansion_card *ec)
+{
+	struct Scsi_Host *host = ecard_get_drvdata(ec);
+	struct eesoxscsi_info *info = (struct eesoxscsi_info *)host->hostdata;
+
+	ecard_set_drvdata(ec, NULL);
+	fas216_remove(host);
+
+	if (info->info.scsi.dma != NO_DMA)
+		free_dma(info->info.scsi.dma);
+	free_irq(ec->irq, info);
+
+	device_remove_file(&ec->dev, &dev_attr_bus_term);
+
+	fas216_release(host);
+	scsi_host_put(host);
+	ecard_release_resources(ec);
+}
+
+static const struct ecard_id eesoxscsi_cids[] = {
+	{ MANU_EESOX, PROD_EESOX_SCSI2 },
+	{ 0xffff, 0xffff },
+};
+
+static struct ecard_driver eesoxscsi_driver = {
+	.probe		= eesoxscsi_probe,
+	.remove		= eesoxscsi_remove,
+	.id_table	= eesoxscsi_cids,
+	.drv = {
+		.name		= "eesoxscsi",
+	},
+};
+
+static int __init eesox_init(void)
+{
+	return ecard_register_driver(&eesoxscsi_driver);
+}
+
+static void __exit eesox_exit(void)
+{
+	ecard_remove_driver(&eesoxscsi_driver);
+}
+
+module_init(eesox_init);
+module_exit(eesox_exit);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("EESOX 'Fast' SCSI driver for Acorn machines");
+module_param_array(term, int, NULL, 0);
+MODULE_PARM_DESC(term, "SCSI bus termination");
+MODULE_LICENSE("GPL");
diff --git a/drivers/scsi/arm/fas216.c b/drivers/scsi/arm/fas216.c
new file mode 100644
index 000000000..4ce0b2d73
--- /dev/null
+++ b/drivers/scsi/arm/fas216.c
@@ -0,0 +1,3038 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  linux/drivers/acorn/scsi/fas216.c
+ *
+ *  Copyright (C) 1997-2003 Russell King
+ *
+ * Based on information in qlogicfas.c by Tom Zerucha, Michael Griffith, and
+ * other sources, including:
+ *   the AMD Am53CF94 data sheet
+ *   the AMD Am53C94 data sheet
+ *
+ * This is a generic driver.  To use it, have a look at cumana_2.c.  You
+ * should define your own structure that overlays FAS216_Info, eg:
+ * struct my_host_data {
+ *    FAS216_Info info;
+ *    ... my host specific data ...
+ * };
+ *
+ * Changelog:
+ *  30-08-1997	RMK	Created
+ *  14-09-1997	RMK	Started disconnect support
+ *  08-02-1998	RMK	Corrected real DMA support
+ *  15-02-1998	RMK	Started sync xfer support
+ *  06-04-1998	RMK	Tightened conditions for printing incomplete
+ *			transfers
+ *  02-05-1998	RMK	Added extra checks in fas216_reset
+ *  24-05-1998	RMK	Fixed synchronous transfers with period >= 200ns
+ *  27-06-1998	RMK	Changed asm/delay.h to linux/delay.h
+ *  26-08-1998	RMK	Improved message support wrt MESSAGE_REJECT
+ *  02-04-2000	RMK	Converted to use the new error handling, and
+ *			automatically request sense data upon check
+ *			condition status from targets.
+ */
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/ioport.h>
+#include <linux/proc_fs.h>
+#include <linux/delay.h>
+#include <linux/bitops.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+
+#include <asm/dma.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/ecard.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_dbg.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_tcq.h>
+#include "fas216.h"
+#include "arm_scsi.h"
+
+/* NOTE: SCSI2 Synchronous transfers *require* DMA according to
+ *  the data sheet.  This restriction is crazy, especially when
+ *  you only want to send 16 bytes!  What were the guys who
+ *  designed this chip on at that time?  Did they read the SCSI2
+ *  spec at all?  The following sections are taken from the SCSI2
+ *  standard (s2r10) concerning this:
+ *
+ * > IMPLEMENTORS NOTES:
+ * >   (1)  Re-negotiation at every selection is not recommended, since a
+ * >   significant performance impact is likely.
+ *
+ * >  The implied synchronous agreement shall remain in effect until a BUS DEVICE
+ * >  RESET message is received, until a hard reset condition occurs, or until one
+ * >  of the two SCSI devices elects to modify the agreement.  The default data
+ * >  transfer mode is asynchronous data transfer mode.  The default data transfer
+ * >  mode is entered at power on, after a BUS DEVICE RESET message, or after a hard
+ * >  reset condition.
+ *
+ *  In total, this means that once you have elected to use synchronous
+ *  transfers, you must always use DMA.
+ *
+ *  I was thinking that this was a good chip until I found this restriction ;(
+ */
+#define SCSI2_SYNC
+
+#undef DEBUG_CONNECT
+#undef DEBUG_MESSAGES
+
+#undef CHECK_STRUCTURE
+
+#define LOG_CONNECT		(1 << 0)
+#define LOG_BUSSERVICE		(1 << 1)
+#define LOG_FUNCTIONDONE	(1 << 2)
+#define LOG_MESSAGES		(1 << 3)
+#define LOG_BUFFER		(1 << 4)
+#define LOG_ERROR		(1 << 8)
+
+static int level_mask = LOG_ERROR;
+
+module_param(level_mask, int, 0644);
+
+#ifndef MODULE
+static int __init fas216_log_setup(char *str)
+{
+	char *s;
+
+	level_mask = 0;
+
+	while ((s = strsep(&str, ",")) != NULL) {
+		switch (s[0]) {
+		case 'a':
+			if (strcmp(s, "all") == 0)
+				level_mask |= -1;
+			break;
+		case 'b':
+			if (strncmp(s, "bus", 3) == 0)
+				level_mask |= LOG_BUSSERVICE;
+			if (strncmp(s, "buf", 3) == 0)
+				level_mask |= LOG_BUFFER;
+			break;
+		case 'c':
+			level_mask |= LOG_CONNECT;
+			break;
+		case 'e':
+			level_mask |= LOG_ERROR;
+			break;
+		case 'm':
+			level_mask |= LOG_MESSAGES;
+			break;
+		case 'n':
+			if (strcmp(s, "none") == 0)
+				level_mask = 0;
+			break;
+		case 's':
+			level_mask |= LOG_FUNCTIONDONE;
+			break;
+		}
+	}
+	return 1;
+}
+
+__setup("fas216_logging=", fas216_log_setup);
+#endif
+
+static inline unsigned char fas216_readb(FAS216_Info *info, unsigned int reg)
+{
+	unsigned int off = reg << info->scsi.io_shift;
+	return readb(info->scsi.io_base + off);
+}
+
+static inline void fas216_writeb(FAS216_Info *info, unsigned int reg, unsigned int val)
+{
+	unsigned int off = reg << info->scsi.io_shift;
+	writeb(val, info->scsi.io_base + off);
+}
+
+static void fas216_dumpstate(FAS216_Info *info)
+{
+	unsigned char is, stat, inst;
+
+	is   = fas216_readb(info, REG_IS);
+	stat = fas216_readb(info, REG_STAT);
+	inst = fas216_readb(info, REG_INST);
+	
+	printk("FAS216: CTCL=%02X CTCM=%02X CMD=%02X STAT=%02X"
+	       " INST=%02X IS=%02X CFIS=%02X",
+		fas216_readb(info, REG_CTCL),
+		fas216_readb(info, REG_CTCM),
+		fas216_readb(info, REG_CMD),  stat, inst, is,
+		fas216_readb(info, REG_CFIS));
+	printk(" CNTL1=%02X CNTL2=%02X CNTL3=%02X CTCH=%02X\n",
+		fas216_readb(info, REG_CNTL1),
+		fas216_readb(info, REG_CNTL2),
+		fas216_readb(info, REG_CNTL3),
+		fas216_readb(info, REG_CTCH));
+}
+
+static void print_SCp(struct scsi_pointer *SCp, const char *prefix, const char *suffix)
+{
+	printk("%sptr %p this_residual 0x%x buffer %p buffers_residual 0x%x%s",
+		prefix, SCp->ptr, SCp->this_residual, SCp->buffer,
+		SCp->buffers_residual, suffix);
+}
+
+#ifdef CHECK_STRUCTURE
+static void fas216_dumpinfo(FAS216_Info *info)
+{
+	static int used = 0;
+	int i;
+
+	if (used++)
+		return;
+
+	printk("FAS216_Info=\n");
+	printk("  { magic_start=%lX host=%p SCpnt=%p origSCpnt=%p\n",
+		info->magic_start, info->host, info->SCpnt,
+		info->origSCpnt);
+	printk("    scsi={ io_shift=%X irq=%X cfg={ %X %X %X %X }\n",
+		info->scsi.io_shift, info->scsi.irq,
+		info->scsi.cfg[0], info->scsi.cfg[1], info->scsi.cfg[2],
+		info->scsi.cfg[3]);
+	printk("           type=%p phase=%X\n",
+		info->scsi.type, info->scsi.phase);
+	print_SCp(&info->scsi.SCp, "           SCp={ ", " }\n");
+	printk("      msgs async_stp=%X disconnectable=%d aborting=%d }\n",
+		info->scsi.async_stp,
+		info->scsi.disconnectable, info->scsi.aborting);
+	printk("    stats={ queues=%X removes=%X fins=%X reads=%X writes=%X miscs=%X\n"
+	       "            disconnects=%X aborts=%X bus_resets=%X host_resets=%X}\n",
+		info->stats.queues, info->stats.removes, info->stats.fins,
+		info->stats.reads, info->stats.writes, info->stats.miscs,
+		info->stats.disconnects, info->stats.aborts, info->stats.bus_resets,
+		info->stats.host_resets);
+	printk("    ifcfg={ clockrate=%X select_timeout=%X asyncperiod=%X sync_max_depth=%X }\n",
+		info->ifcfg.clockrate, info->ifcfg.select_timeout,
+		info->ifcfg.asyncperiod, info->ifcfg.sync_max_depth);
+	for (i = 0; i < 8; i++) {
+		printk("    busyluns[%d]=%08lx dev[%d]={ disconnect_ok=%d stp=%X sof=%X sync_state=%X }\n",
+			i, info->busyluns[i], i,
+			info->device[i].disconnect_ok, info->device[i].stp,
+			info->device[i].sof, info->device[i].sync_state);
+	}
+	printk("    dma={ transfer_type=%X setup=%p pseudo=%p stop=%p }\n",
+		info->dma.transfer_type, info->dma.setup,
+		info->dma.pseudo, info->dma.stop);
+	printk("    internal_done=%X magic_end=%lX }\n",
+		info->internal_done, info->magic_end);
+}
+
+static void __fas216_checkmagic(FAS216_Info *info, const char *func)
+{
+	int corruption = 0;
+	if (info->magic_start != MAGIC) {
+		printk(KERN_CRIT "FAS216 Error: magic at start corrupted\n");
+		corruption++;
+	}
+	if (info->magic_end != MAGIC) {
+		printk(KERN_CRIT "FAS216 Error: magic at end corrupted\n");
+		corruption++;
+	}
+	if (corruption) {
+		fas216_dumpinfo(info);
+		panic("scsi memory space corrupted in %s", func);
+	}
+}
+#define fas216_checkmagic(info) __fas216_checkmagic((info), __func__)
+#else
+#define fas216_checkmagic(info)
+#endif
+
+static const char *fas216_bus_phase(int stat)
+{
+	static const char *phases[] = {
+		"DATA OUT", "DATA IN",
+		"COMMAND", "STATUS",
+		"MISC OUT", "MISC IN",
+		"MESG OUT", "MESG IN"
+	};
+
+	return phases[stat & STAT_BUSMASK];
+}
+
+static const char *fas216_drv_phase(FAS216_Info *info)
+{
+	static const char *phases[] = {
+		[PHASE_IDLE]		= "idle",
+		[PHASE_SELECTION]	= "selection",
+		[PHASE_COMMAND]		= "command",
+		[PHASE_DATAOUT]		= "data out",
+		[PHASE_DATAIN]		= "data in",
+		[PHASE_MSGIN]		= "message in",
+		[PHASE_MSGIN_DISCONNECT]= "disconnect",
+		[PHASE_MSGOUT_EXPECT]	= "expect message out",
+		[PHASE_MSGOUT]		= "message out",
+		[PHASE_STATUS]		= "status",
+		[PHASE_DONE]		= "done",
+	};
+
+	if (info->scsi.phase < ARRAY_SIZE(phases) &&
+	    phases[info->scsi.phase])
+		return phases[info->scsi.phase];
+	return "???";
+}
+
+static char fas216_target(FAS216_Info *info)
+{
+	if (info->SCpnt)
+		return '0' + info->SCpnt->device->id;
+	else
+		return 'H';
+}
+
+static void
+fas216_do_log(FAS216_Info *info, char target, char *fmt, va_list ap)
+{
+	static char buf[1024];
+
+	vsnprintf(buf, sizeof(buf), fmt, ap);
+	printk("scsi%d.%c: %s", info->host->host_no, target, buf);
+}
+
+static void fas216_log_command(FAS216_Info *info, int level,
+			       struct scsi_cmnd *SCpnt, char *fmt, ...)
+{
+	va_list args;
+
+	if (level != 0 && !(level & level_mask))
+		return;
+
+	va_start(args, fmt);
+	fas216_do_log(info, '0' + SCpnt->device->id, fmt, args);
+	va_end(args);
+
+	scsi_print_command(SCpnt);
+}
+
+static void
+fas216_log_target(FAS216_Info *info, int level, int target, char *fmt, ...)
+{
+	va_list args;
+
+	if (level != 0 && !(level & level_mask))
+		return;
+
+	if (target < 0)
+		target = 'H';
+	else
+		target += '0';
+
+	va_start(args, fmt);
+	fas216_do_log(info, target, fmt, args);
+	va_end(args);
+
+	printk("\n");
+}
+
+static void fas216_log(FAS216_Info *info, int level, char *fmt, ...)
+{
+	va_list args;
+
+	if (level != 0 && !(level & level_mask))
+		return;
+
+	va_start(args, fmt);
+	fas216_do_log(info, fas216_target(info), fmt, args);
+	va_end(args);
+
+	printk("\n");
+}
+
+#define PH_SIZE	32
+
+static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE];
+static int ph_ptr;
+
+static void add_debug_list(int stat, int ssr, int isr, int ph)
+{
+	ph_list[ph_ptr].stat = stat;
+	ph_list[ph_ptr].ssr = ssr;
+	ph_list[ph_ptr].isr = isr;
+	ph_list[ph_ptr].ph = ph;
+
+	ph_ptr = (ph_ptr + 1) & (PH_SIZE-1);
+}
+
+static struct { int command; void *from; } cmd_list[8];
+static int cmd_ptr;
+
+static void fas216_cmd(FAS216_Info *info, unsigned int command)
+{
+	cmd_list[cmd_ptr].command = command;
+	cmd_list[cmd_ptr].from = __builtin_return_address(0);
+
+	cmd_ptr = (cmd_ptr + 1) & 7;
+
+	fas216_writeb(info, REG_CMD, command);
+}
+
+static void print_debug_list(void)
+{
+	int i;
+
+	i = ph_ptr;
+
+	printk(KERN_ERR "SCSI IRQ trail\n");
+	do {
+		printk(" %02x:%02x:%02x:%1x",
+			ph_list[i].stat, ph_list[i].ssr,
+			ph_list[i].isr, ph_list[i].ph);
+		i = (i + 1) & (PH_SIZE - 1);
+		if (((i ^ ph_ptr) & 7) == 0)
+			printk("\n");
+	} while (i != ph_ptr);
+	if ((i ^ ph_ptr) & 7)
+		printk("\n");
+
+	i = cmd_ptr;
+	printk(KERN_ERR "FAS216 commands: ");
+	do {
+		printk("%02x:%p ", cmd_list[i].command, cmd_list[i].from);
+		i = (i + 1) & 7;
+	} while (i != cmd_ptr);
+	printk("\n");
+}
+
+static void fas216_done(FAS216_Info *info, unsigned int result);
+
+/**
+ * fas216_get_last_msg - retrive last message from the list
+ * @info: interface to search
+ * @pos: current fifo position
+ *
+ * Retrieve a last message from the list, using position in fifo.
+ */
+static inline unsigned short
+fas216_get_last_msg(FAS216_Info *info, int pos)
+{
+	unsigned short packed_msg = NOP;
+	struct message *msg;
+	int msgnr = 0;
+
+	while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
+		if (pos >= msg->fifo)
+			break;
+	}
+
+	if (msg) {
+		if (msg->msg[0] == EXTENDED_MESSAGE)
+			packed_msg = EXTENDED_MESSAGE | msg->msg[2] << 8;
+		else
+			packed_msg = msg->msg[0];
+	}
+
+	fas216_log(info, LOG_MESSAGES,
+		"Message: %04x found at position %02x\n", packed_msg, pos);
+
+	return packed_msg;
+}
+
+/**
+ * fas216_syncperiod - calculate STP register value
+ * @info: state structure for interface connected to device
+ * @ns: period in ns (between subsequent bytes)
+ *
+ * Calculate value to be loaded into the STP register for a given period
+ * in ns. Returns a value suitable for REG_STP.
+ */
+static int fas216_syncperiod(FAS216_Info *info, int ns)
+{
+	int value = (info->ifcfg.clockrate * ns) / 1000;
+
+	fas216_checkmagic(info);
+
+	if (value < 4)
+		value = 4;
+	else if (value > 35)
+		value = 35;
+
+	return value & 31;
+}
+
+/**
+ * fas216_set_sync - setup FAS216 chip for specified transfer period.
+ * @info: state structure for interface connected to device
+ * @target: target
+ *
+ * Correctly setup FAS216 chip for specified transfer period.
+ * Notes   : we need to switch the chip out of FASTSCSI mode if we have
+ *           a transfer period >= 200ns - otherwise the chip will violate
+ *           the SCSI timings.
+ */
+static void fas216_set_sync(FAS216_Info *info, int target)
+{
+	unsigned int cntl3;
+
+	fas216_writeb(info, REG_SOF, info->device[target].sof);
+	fas216_writeb(info, REG_STP, info->device[target].stp);
+
+	cntl3 = info->scsi.cfg[2];
+	if (info->device[target].period >= (200 / 4))
+		cntl3 = cntl3 & ~CNTL3_FASTSCSI;
+
+	fas216_writeb(info, REG_CNTL3, cntl3);
+}
+
+/* Synchronous transfer support
+ *
+ * Note: The SCSI II r10 spec says (5.6.12):
+ *
+ *  (2)  Due to historical problems with early host adapters that could
+ *  not accept an SDTR message, some targets may not initiate synchronous
+ *  negotiation after a power cycle as required by this standard.  Host
+ *  adapters that support synchronous mode may avoid the ensuing failure
+ *  modes when the target is independently power cycled by initiating a
+ *  synchronous negotiation on each REQUEST SENSE and INQUIRY command.
+ *  This approach increases the SCSI bus overhead and is not recommended
+ *  for new implementations.  The correct method is to respond to an
+ *  SDTR message with a MESSAGE REJECT message if the either the
+ *  initiator or target devices does not support synchronous transfers
+ *  or does not want to negotiate for synchronous transfers at the time.
+ *  Using the correct method assures compatibility with wide data
+ *  transfers and future enhancements.
+ *
+ * We will always initiate a synchronous transfer negotiation request on
+ * every INQUIRY or REQUEST SENSE message, unless the target itself has
+ * at some point performed a synchronous transfer negotiation request, or
+ * we have synchronous transfers disabled for this device.
+ */
+
+/**
+ * fas216_handlesync - Handle a synchronous transfer message
+ * @info: state structure for interface
+ * @msg: message from target
+ *
+ * Handle a synchronous transfer message from the target
+ */
+static void fas216_handlesync(FAS216_Info *info, char *msg)
+{
+	struct fas216_device *dev = &info->device[info->SCpnt->device->id];
+	enum { sync, async, none, reject } res = none;
+
+#ifdef SCSI2_SYNC
+	switch (msg[0]) {
+	case MESSAGE_REJECT:
+		/* Synchronous transfer request failed.
+		 * Note: SCSI II r10:
+		 *
+		 *  SCSI devices that are capable of synchronous
+		 *  data transfers shall not respond to an SDTR
+		 *  message with a MESSAGE REJECT message.
+		 *
+		 * Hence, if we get this condition, we disable
+		 * negotiation for this device.
+		 */
+		if (dev->sync_state == neg_inprogress) {
+			dev->sync_state = neg_invalid;
+			res = async;
+		}
+		break;
+
+	case EXTENDED_MESSAGE:
+		switch (dev->sync_state) {
+		/* We don't accept synchronous transfer requests.
+		 * Respond with a MESSAGE_REJECT to prevent a
+		 * synchronous transfer agreement from being reached.
+		 */
+		case neg_invalid:
+			res = reject;
+			break;
+
+		/* We were not negotiating a synchronous transfer,
+		 * but the device sent us a negotiation request.
+		 * Honour the request by sending back a SDTR
+		 * message containing our capability, limited by
+		 * the targets capability.
+		 */
+		default:
+			fas216_cmd(info, CMD_SETATN);
+			if (msg[4] > info->ifcfg.sync_max_depth)
+				msg[4] = info->ifcfg.sync_max_depth;
+			if (msg[3] < 1000 / info->ifcfg.clockrate)
+				msg[3] = 1000 / info->ifcfg.clockrate;
+
+			msgqueue_flush(&info->scsi.msgs);
+			msgqueue_addmsg(&info->scsi.msgs, 5,
+					EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
+					msg[3], msg[4]);
+			info->scsi.phase = PHASE_MSGOUT_EXPECT;
+
+			/* This is wrong.  The agreement is not in effect
+			 * until this message is accepted by the device
+			 */
+			dev->sync_state = neg_targcomplete;
+			res = sync;
+			break;
+
+		/* We initiated the synchronous transfer negotiation,
+		 * and have successfully received a response from the
+		 * target.  The synchronous transfer agreement has been
+		 * reached.  Note: if the values returned are out of our
+		 * bounds, we must reject the message.
+		 */
+		case neg_inprogress:
+			res = reject;
+			if (msg[4] <= info->ifcfg.sync_max_depth &&
+			    msg[3] >= 1000 / info->ifcfg.clockrate) {
+				dev->sync_state = neg_complete;
+				res = sync;
+			}
+			break;
+		}
+	}
+#else
+	res = reject;
+#endif
+
+	switch (res) {
+	case sync:
+		dev->period = msg[3];
+		dev->sof    = msg[4];
+		dev->stp    = fas216_syncperiod(info, msg[3] * 4);
+		fas216_set_sync(info, info->SCpnt->device->id);
+		break;
+
+	case reject:
+		fas216_cmd(info, CMD_SETATN);
+		msgqueue_flush(&info->scsi.msgs);
+		msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
+		info->scsi.phase = PHASE_MSGOUT_EXPECT;
+		fallthrough;
+
+	case async:
+		dev->period = info->ifcfg.asyncperiod / 4;
+		dev->sof    = 0;
+		dev->stp    = info->scsi.async_stp;
+		fas216_set_sync(info, info->SCpnt->device->id);
+		break;
+
+	case none:
+		break;
+	}
+}
+
+/**
+ * fas216_updateptrs - update data pointers after transfer suspended/paused
+ * @info: interface's local pointer to update
+ * @bytes_transferred: number of bytes transferred
+ *
+ * Update data pointers after transfer suspended/paused
+ */
+static void fas216_updateptrs(FAS216_Info *info, int bytes_transferred)
+{
+	struct scsi_pointer *SCp = &info->scsi.SCp;
+
+	fas216_checkmagic(info);
+
+	BUG_ON(bytes_transferred < 0);
+
+	SCp->phase -= bytes_transferred;
+
+	while (bytes_transferred != 0) {
+		if (SCp->this_residual > bytes_transferred)
+			break;
+		/*
+		 * We have used up this buffer.  Move on to the
+		 * next buffer.
+		 */
+		bytes_transferred -= SCp->this_residual;
+		if (!next_SCp(SCp) && bytes_transferred) {
+			printk(KERN_WARNING "scsi%d.%c: out of buffers\n",
+				info->host->host_no, '0' + info->SCpnt->device->id);
+			return;
+		}
+	}
+
+	SCp->this_residual -= bytes_transferred;
+	if (SCp->this_residual)
+		SCp->ptr += bytes_transferred;
+	else
+		SCp->ptr = NULL;
+}
+
+/**
+ * fas216_pio - transfer data off of/on to card using programmed IO
+ * @info: interface to transfer data to/from
+ * @direction: direction to transfer data (DMA_OUT/DMA_IN)
+ *
+ * Transfer data off of/on to card using programmed IO.
+ * Notes: this is incredibly slow.
+ */
+static void fas216_pio(FAS216_Info *info, fasdmadir_t direction)
+{
+	struct scsi_pointer *SCp = &info->scsi.SCp;
+
+	fas216_checkmagic(info);
+
+	if (direction == DMA_OUT)
+		fas216_writeb(info, REG_FF, get_next_SCp_byte(SCp));
+	else
+		put_next_SCp_byte(SCp, fas216_readb(info, REG_FF));
+
+	if (SCp->this_residual == 0)
+		next_SCp(SCp);
+}
+
+static void fas216_set_stc(FAS216_Info *info, unsigned int length)
+{
+	fas216_writeb(info, REG_STCL, length);
+	fas216_writeb(info, REG_STCM, length >> 8);
+	fas216_writeb(info, REG_STCH, length >> 16);
+}
+
+static unsigned int fas216_get_ctc(FAS216_Info *info)
+{
+	return fas216_readb(info, REG_CTCL) +
+	       (fas216_readb(info, REG_CTCM) << 8) +
+	       (fas216_readb(info, REG_CTCH) << 16);
+}
+
+/**
+ * fas216_cleanuptransfer - clean up after a transfer has completed.
+ * @info: interface to clean up
+ *
+ * Update the data pointers according to the number of bytes transferred
+ * on the SCSI bus.
+ */
+static void fas216_cleanuptransfer(FAS216_Info *info)
+{
+	unsigned long total, residual, fifo;
+	fasdmatype_t dmatype = info->dma.transfer_type;
+
+	info->dma.transfer_type = fasdma_none;
+
+	/*
+	 * PIO transfers do not need to be cleaned up.
+	 */
+	if (dmatype == fasdma_pio || dmatype == fasdma_none)
+		return;
+
+	if (dmatype == fasdma_real_all)
+		total = info->scsi.SCp.phase;
+	else
+		total = info->scsi.SCp.this_residual;
+
+	residual = fas216_get_ctc(info);
+
+	fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
+
+	fas216_log(info, LOG_BUFFER, "cleaning up from previous "
+		   "transfer: length 0x%06x, residual 0x%x, fifo %d",
+		   total, residual, fifo);
+
+	/*
+	 * If we were performing Data-Out, the transfer counter
+	 * counts down each time a byte is transferred by the
+	 * host to the FIFO.  This means we must include the
+	 * bytes left in the FIFO from the transfer counter.
+	 */
+	if (info->scsi.phase == PHASE_DATAOUT)
+		residual += fifo;
+
+	fas216_updateptrs(info, total - residual);
+}
+
+/**
+ * fas216_transfer - Perform a DMA/PIO transfer off of/on to card
+ * @info: interface from which device disconnected from
+ *
+ * Start a DMA/PIO transfer off of/on to card
+ */
+static void fas216_transfer(FAS216_Info *info)
+{
+	fasdmadir_t direction;
+	fasdmatype_t dmatype;
+
+	fas216_log(info, LOG_BUFFER,
+		   "starttransfer: buffer %p length 0x%06x reqlen 0x%06x",
+		   info->scsi.SCp.ptr, info->scsi.SCp.this_residual,
+		   info->scsi.SCp.phase);
+
+	if (!info->scsi.SCp.ptr) {
+		fas216_log(info, LOG_ERROR, "null buffer passed to "
+			   "fas216_starttransfer");
+		print_SCp(&info->scsi.SCp, "SCp: ", "\n");
+		print_SCp(arm_scsi_pointer(info->SCpnt), "Cmnd SCp: ", "\n");
+		return;
+	}
+
+	/*
+	 * If we have a synchronous transfer agreement in effect, we must
+	 * use DMA mode.  If we are using asynchronous transfers, we may
+	 * use DMA mode or PIO mode.
+	 */
+	if (info->device[info->SCpnt->device->id].sof)
+		dmatype = fasdma_real_all;
+	else
+		dmatype = fasdma_pio;
+
+	if (info->scsi.phase == PHASE_DATAOUT)
+		direction = DMA_OUT;
+	else
+		direction = DMA_IN;
+
+	if (info->dma.setup)
+		dmatype = info->dma.setup(info->host, &info->scsi.SCp,
+					  direction, dmatype);
+	info->dma.transfer_type = dmatype;
+
+	if (dmatype == fasdma_real_all)
+		fas216_set_stc(info, info->scsi.SCp.phase);
+	else
+		fas216_set_stc(info, info->scsi.SCp.this_residual);
+
+	switch (dmatype) {
+	case fasdma_pio:
+		fas216_log(info, LOG_BUFFER, "PIO transfer");
+		fas216_writeb(info, REG_SOF, 0);
+		fas216_writeb(info, REG_STP, info->scsi.async_stp);
+		fas216_cmd(info, CMD_TRANSFERINFO);
+		fas216_pio(info, direction);
+		break;
+
+	case fasdma_pseudo:
+		fas216_log(info, LOG_BUFFER, "pseudo transfer");
+		fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
+		info->dma.pseudo(info->host, &info->scsi.SCp,
+				 direction, info->SCpnt->transfersize);
+		break;
+
+	case fasdma_real_block:
+		fas216_log(info, LOG_BUFFER, "block dma transfer");
+		fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
+		break;
+
+	case fasdma_real_all:
+		fas216_log(info, LOG_BUFFER, "total dma transfer");
+		fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA);
+		break;
+
+	default:
+		fas216_log(info, LOG_BUFFER | LOG_ERROR,
+			   "invalid FAS216 DMA type");
+		break;
+	}
+}
+
+/**
+ * fas216_stoptransfer - Stop a DMA transfer onto / off of the card
+ * @info: interface from which device disconnected from
+ *
+ * Called when we switch away from DATA IN or DATA OUT phases.
+ */
+static void fas216_stoptransfer(FAS216_Info *info)
+{
+	fas216_checkmagic(info);
+
+	if (info->dma.transfer_type == fasdma_real_all ||
+	    info->dma.transfer_type == fasdma_real_block)
+		info->dma.stop(info->host, &info->scsi.SCp);
+
+	fas216_cleanuptransfer(info);
+
+	if (info->scsi.phase == PHASE_DATAIN) {
+		unsigned int fifo;
+
+		/*
+		 * If we were performing Data-In, then the FIFO counter
+		 * contains the number of bytes not transferred via DMA
+		 * from the on-board FIFO.  Read them manually.
+		 */
+		fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
+		while (fifo && info->scsi.SCp.ptr) {
+			*info->scsi.SCp.ptr = fas216_readb(info, REG_FF);
+			fas216_updateptrs(info, 1);
+			fifo--;
+		}
+	} else {
+		/*
+		 * After a Data-Out phase, there may be unsent
+		 * bytes left in the FIFO.  Flush them out.
+		 */
+		fas216_cmd(info, CMD_FLUSHFIFO);
+	}
+}
+
+static void fas216_aborttransfer(FAS216_Info *info)
+{
+	fas216_checkmagic(info);
+
+	if (info->dma.transfer_type == fasdma_real_all ||
+	    info->dma.transfer_type == fasdma_real_block)
+		info->dma.stop(info->host, &info->scsi.SCp);
+
+	info->dma.transfer_type = fasdma_none;
+	fas216_cmd(info, CMD_FLUSHFIFO);
+}
+
+static void fas216_kick(FAS216_Info *info);
+
+/**
+ * fas216_disconnected_intr - handle device disconnection
+ * @info: interface from which device disconnected from
+ *
+ * Handle device disconnection
+ */
+static void fas216_disconnect_intr(FAS216_Info *info)
+{
+	unsigned long flags;
+
+	fas216_checkmagic(info);
+
+	fas216_log(info, LOG_CONNECT, "disconnect phase=%02x",
+		   info->scsi.phase);
+
+	msgqueue_flush(&info->scsi.msgs);
+
+	switch (info->scsi.phase) {
+	case PHASE_SELECTION:			/* while selecting - no target		*/
+	case PHASE_SELSTEPS:
+		fas216_done(info, DID_NO_CONNECT);
+		break;
+
+	case PHASE_MSGIN_DISCONNECT:		/* message in - disconnecting		*/
+		info->scsi.disconnectable = 1;
+		info->scsi.phase = PHASE_IDLE;
+		info->stats.disconnects += 1;
+		spin_lock_irqsave(&info->host_lock, flags);
+		if (info->scsi.phase == PHASE_IDLE)
+			fas216_kick(info);
+		spin_unlock_irqrestore(&info->host_lock, flags);
+		break;
+
+	case PHASE_DONE:			/* at end of command - complete		*/
+		fas216_done(info, DID_OK);
+		break;
+
+	case PHASE_MSGOUT:			/* message out - possible ABORT message	*/
+		if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) {
+			info->scsi.aborting = 0;
+			fas216_done(info, DID_ABORT);
+			break;
+		}
+		fallthrough;
+
+	default:				/* huh?					*/
+		printk(KERN_ERR "scsi%d.%c: unexpected disconnect in phase %s\n",
+			info->host->host_no, fas216_target(info), fas216_drv_phase(info));
+		print_debug_list();
+		fas216_stoptransfer(info);
+		fas216_done(info, DID_ERROR);
+		break;
+	}
+}
+
+/**
+ * fas216_reselected_intr - start reconnection of a device
+ * @info: interface which was reselected
+ *
+ * Start reconnection of a device
+ */
+static void
+fas216_reselected_intr(FAS216_Info *info)
+{
+	unsigned int cfis, i;
+	unsigned char msg[4];
+	unsigned char target, lun, tag;
+
+	fas216_checkmagic(info);
+
+	WARN_ON(info->scsi.phase == PHASE_SELECTION ||
+		info->scsi.phase == PHASE_SELSTEPS);
+
+	cfis = fas216_readb(info, REG_CFIS);
+
+	fas216_log(info, LOG_CONNECT, "reconnect phase=%02x cfis=%02x",
+		   info->scsi.phase, cfis);
+
+	cfis &= CFIS_CF;
+
+	if (cfis < 2 || cfis > 4) {
+		printk(KERN_ERR "scsi%d.H: incorrect number of bytes after reselect\n",
+			info->host->host_no);
+		goto bad_message;
+	}
+
+	for (i = 0; i < cfis; i++)
+		msg[i] = fas216_readb(info, REG_FF);
+
+	if (!(msg[0] & (1 << info->host->this_id)) ||
+	    !(msg[1] & 0x80))
+		goto initiator_error;
+
+	target = msg[0] & ~(1 << info->host->this_id);
+	target = ffs(target) - 1;
+	lun = msg[1] & 7;
+	tag = 0;
+
+	if (cfis >= 3) {
+		if (msg[2] != SIMPLE_QUEUE_TAG)
+			goto initiator_error;
+
+		tag = msg[3];
+	}
+
+	/* set up for synchronous transfers */
+	fas216_writeb(info, REG_SDID, target);
+	fas216_set_sync(info, target);
+	msgqueue_flush(&info->scsi.msgs);
+
+	fas216_log(info, LOG_CONNECT, "Reconnected: target %1x lun %1x tag %02x",
+		   target, lun, tag);
+
+	if (info->scsi.disconnectable && info->SCpnt) {
+		info->scsi.disconnectable = 0;
+		if (info->SCpnt->device->id  == target &&
+		    info->SCpnt->device->lun == lun &&
+		    scsi_cmd_to_rq(info->SCpnt)->tag == tag) {
+			fas216_log(info, LOG_CONNECT, "reconnected previously executing command");
+		} else {
+			queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
+			fas216_log(info, LOG_CONNECT, "had to move command to disconnected queue");
+			info->SCpnt = NULL;
+		}
+	}
+	if (!info->SCpnt) {
+		info->SCpnt = queue_remove_tgtluntag(&info->queues.disconnected,
+					target, lun, tag);
+		fas216_log(info, LOG_CONNECT, "had to get command");
+	}
+
+	if (info->SCpnt) {
+		/*
+		 * Restore data pointer from SAVED data pointer
+		 */
+		info->scsi.SCp = *arm_scsi_pointer(info->SCpnt);
+
+		fas216_log(info, LOG_CONNECT, "data pointers: [%p, %X]",
+			info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
+		info->scsi.phase = PHASE_MSGIN;
+	} else {
+		/*
+		 * Our command structure not found - abort the
+		 * command on the target.  Since we have no
+		 * record of this command, we can't send
+		 * an INITIATOR DETECTED ERROR message.
+		 */
+		fas216_cmd(info, CMD_SETATN);
+
+#if 0
+		if (tag)
+			msgqueue_addmsg(&info->scsi.msgs, 2, ABORT_TAG, tag);
+		else
+#endif
+			msgqueue_addmsg(&info->scsi.msgs, 1, ABORT);
+		info->scsi.phase = PHASE_MSGOUT_EXPECT;
+		info->scsi.aborting = 1;
+	}
+
+	fas216_cmd(info, CMD_MSGACCEPTED);
+	return;
+
+ initiator_error:
+	printk(KERN_ERR "scsi%d.H: error during reselection: bytes",
+		info->host->host_no);
+	for (i = 0; i < cfis; i++)
+		printk(" %02x", msg[i]);
+	printk("\n");
+ bad_message:
+	fas216_cmd(info, CMD_SETATN);
+	msgqueue_flush(&info->scsi.msgs);
+	msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
+	info->scsi.phase = PHASE_MSGOUT_EXPECT;
+	fas216_cmd(info, CMD_MSGACCEPTED);
+}
+
+static void fas216_parse_message(FAS216_Info *info, unsigned char *message, int msglen)
+{
+	struct scsi_pointer *scsi_pointer;
+	int i;
+
+	switch (message[0]) {
+	case COMMAND_COMPLETE:
+		if (msglen != 1)
+			goto unrecognised;
+
+		printk(KERN_ERR "scsi%d.%c: command complete with no "
+			"status in MESSAGE_IN?\n",
+			info->host->host_no, fas216_target(info));
+		break;
+
+	case SAVE_POINTERS:
+		if (msglen != 1)
+			goto unrecognised;
+
+		/*
+		 * Save current data pointer to SAVED data pointer
+		 * SCSI II standard says that we must not acknowledge
+		 * this until we have really saved pointers.
+		 * NOTE: we DO NOT save the command nor status pointers
+		 * as required by the SCSI II standard.  These always
+		 * point to the start of their respective areas.
+		 */
+		scsi_pointer = arm_scsi_pointer(info->SCpnt);
+		*scsi_pointer = info->scsi.SCp;
+		scsi_pointer->sent_command = 0;
+		fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
+			"save data pointers: [%p, %X]",
+			info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
+		break;
+
+	case RESTORE_POINTERS:
+		if (msglen != 1)
+			goto unrecognised;
+
+		/*
+		 * Restore current data pointer from SAVED data pointer
+		 */
+		info->scsi.SCp = *arm_scsi_pointer(info->SCpnt);
+		fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER,
+			"restore data pointers: [%p, 0x%x]",
+			info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
+		break;
+
+	case DISCONNECT:
+		if (msglen != 1)
+			goto unrecognised;
+
+		info->scsi.phase = PHASE_MSGIN_DISCONNECT;
+		break;
+
+	case MESSAGE_REJECT:
+		if (msglen != 1)
+			goto unrecognised;
+
+		switch (fas216_get_last_msg(info, info->scsi.msgin_fifo)) {
+		case EXTENDED_MESSAGE | EXTENDED_SDTR << 8:
+			fas216_handlesync(info, message);
+			break;
+
+		default:
+			fas216_log(info, 0, "reject, last message 0x%04x",
+				fas216_get_last_msg(info, info->scsi.msgin_fifo));
+		}
+		break;
+
+	case NOP:
+		break;
+
+	case EXTENDED_MESSAGE:
+		if (msglen < 3)
+			goto unrecognised;
+
+		switch (message[2]) {
+		case EXTENDED_SDTR:	/* Sync transfer negotiation request/reply */
+			fas216_handlesync(info, message);
+			break;
+
+		default:
+			goto unrecognised;
+		}
+		break;
+
+	default:
+		goto unrecognised;
+	}
+	return;
+
+unrecognised:
+	fas216_log(info, 0, "unrecognised message, rejecting");
+	printk("scsi%d.%c: message was", info->host->host_no, fas216_target(info));
+	for (i = 0; i < msglen; i++)
+		printk("%s%02X", i & 31 ? " " : "\n  ", message[i]);
+	printk("\n");
+
+	/*
+	 * Something strange seems to be happening here -
+	 * I can't use SETATN since the chip gives me an
+	 * invalid command interrupt when I do.  Weird.
+	 */
+fas216_cmd(info, CMD_NOP);
+fas216_dumpstate(info);
+	fas216_cmd(info, CMD_SETATN);
+	msgqueue_flush(&info->scsi.msgs);
+	msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT);
+	info->scsi.phase = PHASE_MSGOUT_EXPECT;
+fas216_dumpstate(info);
+}
+
+static int fas216_wait_cmd(FAS216_Info *info, int cmd)
+{
+	int tout;
+	int stat;
+
+	fas216_cmd(info, cmd);
+
+	for (tout = 1000; tout; tout -= 1) {
+		stat = fas216_readb(info, REG_STAT);
+		if (stat & (STAT_INT|STAT_PARITYERROR))
+			break;
+		udelay(1);
+	}
+
+	return stat;
+}
+
+static int fas216_get_msg_byte(FAS216_Info *info)
+{
+	unsigned int stat = fas216_wait_cmd(info, CMD_MSGACCEPTED);
+
+	if ((stat & STAT_INT) == 0)
+		goto timedout;
+
+	if ((stat & STAT_BUSMASK) != STAT_MESGIN)
+		goto unexpected_phase_change;
+
+	fas216_readb(info, REG_INST);
+
+	stat = fas216_wait_cmd(info, CMD_TRANSFERINFO);
+
+	if ((stat & STAT_INT) == 0)
+		goto timedout;
+
+	if (stat & STAT_PARITYERROR)
+		goto parity_error;
+
+	if ((stat & STAT_BUSMASK) != STAT_MESGIN)
+		goto unexpected_phase_change;
+
+	fas216_readb(info, REG_INST);
+
+	return fas216_readb(info, REG_FF);
+
+timedout:
+	fas216_log(info, LOG_ERROR, "timed out waiting for message byte");
+	return -1;
+
+unexpected_phase_change:
+	fas216_log(info, LOG_ERROR, "unexpected phase change: status = %02x", stat);
+	return -2;
+
+parity_error:
+	fas216_log(info, LOG_ERROR, "parity error during message in phase");
+	return -3;
+}
+
+/**
+ * fas216_message - handle a function done interrupt from FAS216 chip
+ * @info: interface which caused function done interrupt
+ *
+ * Handle a function done interrupt from FAS216 chip
+ */
+static void fas216_message(FAS216_Info *info)
+{
+	unsigned char *message = info->scsi.message;
+	unsigned int msglen = 1;
+	int msgbyte = 0;
+
+	fas216_checkmagic(info);
+
+	message[0] = fas216_readb(info, REG_FF);
+
+	if (message[0] == EXTENDED_MESSAGE) {
+		msgbyte = fas216_get_msg_byte(info);
+
+		if (msgbyte >= 0) {
+			message[1] = msgbyte;
+
+			for (msglen = 2; msglen < message[1] + 2; msglen++) {
+				msgbyte = fas216_get_msg_byte(info);
+
+				if (msgbyte >= 0)
+					message[msglen] = msgbyte;
+				else
+					break;
+			}
+		}
+	}
+
+	if (msgbyte == -3)
+		goto parity_error;
+
+#ifdef DEBUG_MESSAGES
+	{
+		int i;
+
+		printk("scsi%d.%c: message in: ",
+			info->host->host_no, fas216_target(info));
+		for (i = 0; i < msglen; i++)
+			printk("%02X ", message[i]);
+		printk("\n");
+	}
+#endif
+
+	fas216_parse_message(info, message, msglen);
+	fas216_cmd(info, CMD_MSGACCEPTED);
+	return;
+
+parity_error:
+	fas216_cmd(info, CMD_SETATN);
+	msgqueue_flush(&info->scsi.msgs);
+	msgqueue_addmsg(&info->scsi.msgs, 1, MSG_PARITY_ERROR);
+	info->scsi.phase = PHASE_MSGOUT_EXPECT;
+	fas216_cmd(info, CMD_MSGACCEPTED);
+	return;
+}
+
+/**
+ * fas216_send_command - send command after all message bytes have been sent
+ * @info: interface which caused bus service
+ *
+ * Send a command to a target after all message bytes have been sent
+ */
+static void fas216_send_command(FAS216_Info *info)
+{
+	int i;
+
+	fas216_checkmagic(info);
+
+	fas216_cmd(info, CMD_NOP|CMD_WITHDMA);
+	fas216_cmd(info, CMD_FLUSHFIFO);
+
+	/* load command */
+	for (i = info->scsi.SCp.sent_command; i < info->SCpnt->cmd_len; i++)
+		fas216_writeb(info, REG_FF, info->SCpnt->cmnd[i]);
+
+	fas216_cmd(info, CMD_TRANSFERINFO);
+
+	info->scsi.phase = PHASE_COMMAND;
+}
+
+/**
+ * fas216_send_messageout - handle bus service to send a message
+ * @info: interface which caused bus service
+ *
+ * Handle bus service to send a message.
+ * Note: We do not allow the device to change the data direction!
+ */
+static void fas216_send_messageout(FAS216_Info *info, int start)
+{
+	unsigned int tot_msglen = msgqueue_msglength(&info->scsi.msgs);
+
+	fas216_checkmagic(info);
+
+	fas216_cmd(info, CMD_FLUSHFIFO);
+
+	if (tot_msglen) {
+		struct message *msg;
+		int msgnr = 0;
+
+		while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
+			int i;
+
+			for (i = start; i < msg->length; i++)
+				fas216_writeb(info, REG_FF, msg->msg[i]);
+
+			msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
+			start = 0;
+		}
+	} else
+		fas216_writeb(info, REG_FF, NOP);
+
+	fas216_cmd(info, CMD_TRANSFERINFO);
+
+	info->scsi.phase = PHASE_MSGOUT;
+}
+
+/**
+ * fas216_busservice_intr - handle bus service interrupt from FAS216 chip
+ * @info: interface which caused bus service interrupt
+ * @stat: Status register contents
+ * @is: SCSI Status register contents
+ *
+ * Handle a bus service interrupt from FAS216 chip
+ */
+static void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
+{
+	fas216_checkmagic(info);
+
+	fas216_log(info, LOG_BUSSERVICE,
+		   "bus service: stat=%02x is=%02x phase=%02x",
+		   stat, is, info->scsi.phase);
+
+	switch (info->scsi.phase) {
+	case PHASE_SELECTION:
+		if ((is & IS_BITS) != IS_MSGBYTESENT)
+			goto bad_is;
+		break;
+
+	case PHASE_SELSTEPS:
+		switch (is & IS_BITS) {
+		case IS_SELARB:
+		case IS_MSGBYTESENT:
+			goto bad_is;
+
+		case IS_NOTCOMMAND:
+		case IS_EARLYPHASE:
+			if ((stat & STAT_BUSMASK) == STAT_MESGIN)
+				break;
+			goto bad_is;
+
+		case IS_COMPLETE:
+			break;
+		}
+		break;
+
+	default:
+		break;
+	}
+
+	fas216_cmd(info, CMD_NOP);
+
+#define STATE(st,ph) ((ph) << 3 | (st))
+	/* This table describes the legal SCSI state transitions,
+	 * as described by the SCSI II spec.
+	 */
+	switch (STATE(stat & STAT_BUSMASK, info->scsi.phase)) {
+	case STATE(STAT_DATAIN, PHASE_SELSTEPS):/* Sel w/ steps -> Data In      */
+	case STATE(STAT_DATAIN, PHASE_MSGOUT):  /* Message Out  -> Data In      */
+	case STATE(STAT_DATAIN, PHASE_COMMAND): /* Command      -> Data In      */
+	case STATE(STAT_DATAIN, PHASE_MSGIN):   /* Message In   -> Data In      */
+		info->scsi.phase = PHASE_DATAIN;
+		fas216_transfer(info);
+		return;
+
+	case STATE(STAT_DATAIN, PHASE_DATAIN):  /* Data In      -> Data In      */
+	case STATE(STAT_DATAOUT, PHASE_DATAOUT):/* Data Out     -> Data Out     */
+		fas216_cleanuptransfer(info);
+		fas216_transfer(info);
+		return;
+
+	case STATE(STAT_DATAOUT, PHASE_SELSTEPS):/* Sel w/ steps-> Data Out     */
+	case STATE(STAT_DATAOUT, PHASE_MSGOUT): /* Message Out  -> Data Out     */
+	case STATE(STAT_DATAOUT, PHASE_COMMAND):/* Command      -> Data Out     */
+	case STATE(STAT_DATAOUT, PHASE_MSGIN):  /* Message In   -> Data Out     */
+		fas216_cmd(info, CMD_FLUSHFIFO);
+		info->scsi.phase = PHASE_DATAOUT;
+		fas216_transfer(info);
+		return;
+
+	case STATE(STAT_STATUS, PHASE_DATAOUT): /* Data Out     -> Status       */
+	case STATE(STAT_STATUS, PHASE_DATAIN):  /* Data In      -> Status       */
+		fas216_stoptransfer(info);
+		fallthrough;
+
+	case STATE(STAT_STATUS, PHASE_SELSTEPS):/* Sel w/ steps -> Status       */
+	case STATE(STAT_STATUS, PHASE_MSGOUT):  /* Message Out  -> Status       */
+	case STATE(STAT_STATUS, PHASE_COMMAND): /* Command      -> Status       */
+	case STATE(STAT_STATUS, PHASE_MSGIN):   /* Message In   -> Status       */
+		fas216_cmd(info, CMD_INITCMDCOMPLETE);
+		info->scsi.phase = PHASE_STATUS;
+		return;
+
+	case STATE(STAT_MESGIN, PHASE_DATAOUT): /* Data Out     -> Message In   */
+	case STATE(STAT_MESGIN, PHASE_DATAIN):  /* Data In      -> Message In   */
+		fas216_stoptransfer(info);
+		fallthrough;
+
+	case STATE(STAT_MESGIN, PHASE_COMMAND):	/* Command	-> Message In	*/
+	case STATE(STAT_MESGIN, PHASE_SELSTEPS):/* Sel w/ steps -> Message In   */
+	case STATE(STAT_MESGIN, PHASE_MSGOUT):  /* Message Out  -> Message In   */
+		info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
+		fas216_cmd(info, CMD_FLUSHFIFO);
+		fas216_cmd(info, CMD_TRANSFERINFO);
+		info->scsi.phase = PHASE_MSGIN;
+		return;
+
+	case STATE(STAT_MESGIN, PHASE_MSGIN):
+		info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF;
+		fas216_cmd(info, CMD_TRANSFERINFO);
+		return;
+
+	case STATE(STAT_COMMAND, PHASE_MSGOUT): /* Message Out  -> Command      */
+	case STATE(STAT_COMMAND, PHASE_MSGIN):  /* Message In   -> Command      */
+		fas216_send_command(info);
+		info->scsi.phase = PHASE_COMMAND;
+		return;
+
+
+	/*
+	 * Selection    -> Message Out
+	 */
+	case STATE(STAT_MESGOUT, PHASE_SELECTION):
+		fas216_send_messageout(info, 1);
+		return;
+
+	/*
+	 * Message Out  -> Message Out
+	 */
+	case STATE(STAT_MESGOUT, PHASE_SELSTEPS):
+	case STATE(STAT_MESGOUT, PHASE_MSGOUT):
+		/*
+		 * If we get another message out phase, this usually
+		 * means some parity error occurred.  Resend complete
+		 * set of messages.  If we have more than one byte to
+		 * send, we need to assert ATN again.
+		 */
+		if (info->device[info->SCpnt->device->id].parity_check) {
+			/*
+			 * We were testing... good, the device
+			 * supports parity checking.
+			 */
+			info->device[info->SCpnt->device->id].parity_check = 0;
+			info->device[info->SCpnt->device->id].parity_enabled = 1;
+			fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
+		}
+
+		if (msgqueue_msglength(&info->scsi.msgs) > 1)
+			fas216_cmd(info, CMD_SETATN);
+		fallthrough;
+
+	/*
+	 * Any          -> Message Out
+	 */
+	case STATE(STAT_MESGOUT, PHASE_MSGOUT_EXPECT):
+		fas216_send_messageout(info, 0);
+		return;
+
+	/* Error recovery rules.
+	 *   These either attempt to abort or retry the operation.
+	 * TODO: we need more of these
+	 */
+	case STATE(STAT_COMMAND, PHASE_COMMAND):/* Command      -> Command      */
+		/* error - we've sent out all the command bytes
+		 * we have.
+		 * NOTE: we need SAVE DATA POINTERS/RESTORE DATA POINTERS
+		 * to include the command bytes sent for this to work
+		 * correctly.
+		 */
+		printk(KERN_ERR "scsi%d.%c: "
+			"target trying to receive more command bytes\n",
+			info->host->host_no, fas216_target(info));
+		fas216_cmd(info, CMD_SETATN);
+		fas216_set_stc(info, 15);
+		fas216_cmd(info, CMD_PADBYTES | CMD_WITHDMA);
+		msgqueue_flush(&info->scsi.msgs);
+		msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
+		info->scsi.phase = PHASE_MSGOUT_EXPECT;
+		return;
+	}
+
+	if (info->scsi.phase == PHASE_MSGIN_DISCONNECT) {
+		printk(KERN_ERR "scsi%d.%c: disconnect message received, but bus service %s?\n",
+			info->host->host_no, fas216_target(info),
+			fas216_bus_phase(stat));
+		msgqueue_flush(&info->scsi.msgs);
+		fas216_cmd(info, CMD_SETATN);
+		msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR);
+		info->scsi.phase = PHASE_MSGOUT_EXPECT;
+		info->scsi.aborting = 1;
+		fas216_cmd(info, CMD_TRANSFERINFO);
+		return;
+	}
+	printk(KERN_ERR "scsi%d.%c: bus phase %s after %s?\n",
+		info->host->host_no, fas216_target(info),
+		fas216_bus_phase(stat),
+		fas216_drv_phase(info));
+	print_debug_list();
+	return;
+
+bad_is:
+	fas216_log(info, 0, "bus service at step %d?", is & IS_BITS);
+	fas216_dumpstate(info);
+	print_debug_list();
+
+	fas216_done(info, DID_ERROR);
+}
+
+/**
+ * fas216_funcdone_intr - handle a function done interrupt from FAS216 chip
+ * @info: interface which caused function done interrupt
+ * @stat: Status register contents
+ * @is: SCSI Status register contents
+ *
+ * Handle a function done interrupt from FAS216 chip
+ */
+static void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int is)
+{
+	unsigned int fifo_len = fas216_readb(info, REG_CFIS) & CFIS_CF;
+
+	fas216_checkmagic(info);
+
+	fas216_log(info, LOG_FUNCTIONDONE,
+		   "function done: stat=%02x is=%02x phase=%02x",
+		   stat, is, info->scsi.phase);
+
+	switch (info->scsi.phase) {
+	case PHASE_STATUS:			/* status phase - read status and msg	*/
+		if (fifo_len != 2) {
+			fas216_log(info, 0, "odd number of bytes in FIFO: %d", fifo_len);
+		}
+		/*
+		 * Read status then message byte.
+		 */
+		info->scsi.SCp.Status = fas216_readb(info, REG_FF);
+		info->scsi.SCp.Message = fas216_readb(info, REG_FF);
+		info->scsi.phase = PHASE_DONE;
+		fas216_cmd(info, CMD_MSGACCEPTED);
+		break;
+
+	case PHASE_IDLE:
+	case PHASE_SELECTION:
+	case PHASE_SELSTEPS:
+		break;
+
+	case PHASE_MSGIN:			/* message in phase			*/
+		if ((stat & STAT_BUSMASK) == STAT_MESGIN) {
+			info->scsi.msgin_fifo = fifo_len;
+			fas216_message(info);
+			break;
+		}
+		fallthrough;
+
+	default:
+		fas216_log(info, 0, "internal phase %s for function done?"
+			"  What do I do with this?",
+			fas216_target(info), fas216_drv_phase(info));
+	}
+}
+
+static void fas216_bus_reset(FAS216_Info *info)
+{
+	neg_t sync_state;
+	int i;
+
+	msgqueue_flush(&info->scsi.msgs);
+
+	sync_state = neg_invalid;
+
+#ifdef SCSI2_SYNC
+	if (info->ifcfg.capabilities & (FASCAP_DMA|FASCAP_PSEUDODMA))
+		sync_state = neg_wait;
+#endif
+
+	info->scsi.phase = PHASE_IDLE;
+	info->SCpnt = NULL; /* bug! */
+	memset(&info->scsi.SCp, 0, sizeof(info->scsi.SCp));
+
+	for (i = 0; i < 8; i++) {
+		info->device[i].disconnect_ok	= info->ifcfg.disconnect_ok;
+		info->device[i].sync_state	= sync_state;
+		info->device[i].period		= info->ifcfg.asyncperiod / 4;
+		info->device[i].stp		= info->scsi.async_stp;
+		info->device[i].sof		= 0;
+		info->device[i].wide_xfer	= 0;
+	}
+
+	info->rst_bus_status = 1;
+	wake_up(&info->eh_wait);
+}
+
+/**
+ * fas216_intr - handle interrupts to progress a command
+ * @info: interface to service
+ *
+ * Handle interrupts from the interface to progress a command
+ */
+irqreturn_t fas216_intr(FAS216_Info *info)
+{
+	unsigned char inst, is, stat;
+	int handled = IRQ_NONE;
+
+	fas216_checkmagic(info);
+
+	stat = fas216_readb(info, REG_STAT);
+	is = fas216_readb(info, REG_IS);
+	inst = fas216_readb(info, REG_INST);
+
+	add_debug_list(stat, is, inst, info->scsi.phase);
+
+	if (stat & STAT_INT) {
+		if (inst & INST_BUSRESET) {
+			fas216_log(info, 0, "bus reset detected");
+			fas216_bus_reset(info);
+			scsi_report_bus_reset(info->host, 0);
+		} else if (inst & INST_ILLEGALCMD) {
+			fas216_log(info, LOG_ERROR, "illegal command given\n");
+			fas216_dumpstate(info);
+			print_debug_list();
+		} else if (inst & INST_DISCONNECT)
+			fas216_disconnect_intr(info);
+		else if (inst & INST_RESELECTED)	/* reselected			*/
+			fas216_reselected_intr(info);
+		else if (inst & INST_BUSSERVICE)	/* bus service request		*/
+			fas216_busservice_intr(info, stat, is);
+		else if (inst & INST_FUNCDONE)		/* function done		*/
+			fas216_funcdone_intr(info, stat, is);
+		else
+		    	fas216_log(info, 0, "unknown interrupt received:"
+				" phase %s inst %02X is %02X stat %02X",
+				fas216_drv_phase(info), inst, is, stat);
+		handled = IRQ_HANDLED;
+	}
+	return handled;
+}
+
+static void __fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
+{
+	int tot_msglen;
+
+	/* following what the ESP driver says */
+	fas216_set_stc(info, 0);
+	fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
+
+	/* flush FIFO */
+	fas216_cmd(info, CMD_FLUSHFIFO);
+
+	/* load bus-id and timeout */
+	fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
+	fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
+
+	/* synchronous transfers */
+	fas216_set_sync(info, SCpnt->device->id);
+
+	tot_msglen = msgqueue_msglength(&info->scsi.msgs);
+
+#ifdef DEBUG_MESSAGES
+	{
+		struct message *msg;
+		int msgnr = 0, i;
+
+		printk("scsi%d.%c: message out: ",
+			info->host->host_no, '0' + SCpnt->device->id);
+		while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
+			printk("{ ");
+			for (i = 0; i < msg->length; i++)
+				printk("%02x ", msg->msg[i]);
+			printk("} ");
+		}
+		printk("\n");
+	}
+#endif
+
+	if (tot_msglen == 1 || tot_msglen == 3) {
+		/*
+		 * We have an easy message length to send...
+		 */
+		struct message *msg;
+		int msgnr = 0, i;
+
+		info->scsi.phase = PHASE_SELSTEPS;
+
+		/* load message bytes */
+		while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) {
+			for (i = 0; i < msg->length; i++)
+				fas216_writeb(info, REG_FF, msg->msg[i]);
+			msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF);
+		}
+
+		/* load command */
+		for (i = 0; i < SCpnt->cmd_len; i++)
+			fas216_writeb(info, REG_FF, SCpnt->cmnd[i]);
+
+		if (tot_msglen == 1)
+			fas216_cmd(info, CMD_SELECTATN);
+		else
+			fas216_cmd(info, CMD_SELECTATN3);
+	} else {
+		/*
+		 * We have an unusual number of message bytes to send.
+		 *  Load first byte into fifo, and issue SELECT with ATN and
+		 *  stop steps.
+		 */
+		struct message *msg = msgqueue_getmsg(&info->scsi.msgs, 0);
+
+		fas216_writeb(info, REG_FF, msg->msg[0]);
+		msg->fifo = 1;
+
+		fas216_cmd(info, CMD_SELECTATNSTOP);
+	}
+}
+
+/*
+ * Decide whether we need to perform a parity test on this device.
+ * Can also be used to force parity error conditions during initial
+ * information transfer phase (message out) for test purposes.
+ */
+static int parity_test(FAS216_Info *info, int target)
+{
+#if 0
+	if (target == 3) {
+		info->device[target].parity_check = 0;
+		return 1;
+	}
+#endif
+	return info->device[target].parity_check;
+}
+
+static void fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt)
+{
+	int disconnect_ok;
+
+	/*
+	 * claim host busy
+	 */
+	info->scsi.phase = PHASE_SELECTION;
+	info->scsi.SCp = *arm_scsi_pointer(SCpnt);
+	info->SCpnt = SCpnt;
+	info->dma.transfer_type = fasdma_none;
+
+	if (parity_test(info, SCpnt->device->id))
+		fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_PTE);
+	else
+		fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
+
+	/*
+	 * Don't allow request sense commands to disconnect.
+	 */
+	disconnect_ok = SCpnt->cmnd[0] != REQUEST_SENSE &&
+			info->device[SCpnt->device->id].disconnect_ok;
+
+	/*
+	 * build outgoing message bytes
+	 */
+	msgqueue_flush(&info->scsi.msgs);
+	msgqueue_addmsg(&info->scsi.msgs, 1, IDENTIFY(disconnect_ok, SCpnt->device->lun));
+
+	/*
+	 * add tag message if required
+	 */
+	if (SCpnt->device->simple_tags)
+		msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG,
+				scsi_cmd_to_rq(SCpnt)->tag);
+
+	do {
+#ifdef SCSI2_SYNC
+		if ((info->device[SCpnt->device->id].sync_state == neg_wait ||
+		     info->device[SCpnt->device->id].sync_state == neg_complete) &&
+		    (SCpnt->cmnd[0] == REQUEST_SENSE ||
+		     SCpnt->cmnd[0] == INQUIRY)) {
+			info->device[SCpnt->device->id].sync_state = neg_inprogress;
+			msgqueue_addmsg(&info->scsi.msgs, 5,
+					EXTENDED_MESSAGE, 3, EXTENDED_SDTR,
+					1000 / info->ifcfg.clockrate,
+					info->ifcfg.sync_max_depth);
+			break;
+		}
+#endif
+	} while (0);
+
+	__fas216_start_command(info, SCpnt);
+}
+
+static void fas216_allocate_tag(FAS216_Info *info, struct scsi_cmnd *SCpnt)
+{
+	set_bit(SCpnt->device->id * 8 +
+		(u8)(SCpnt->device->lun & 0x7), info->busyluns);
+
+	info->stats.removes += 1;
+	switch (SCpnt->cmnd[0]) {
+	case WRITE_6:
+	case WRITE_10:
+	case WRITE_12:
+		info->stats.writes += 1;
+		break;
+	case READ_6:
+	case READ_10:
+	case READ_12:
+		info->stats.reads += 1;
+		break;
+	default:
+		info->stats.miscs += 1;
+		break;
+	}
+}
+
+static void fas216_do_bus_device_reset(FAS216_Info *info,
+				       struct scsi_cmnd *SCpnt)
+{
+	struct message *msg;
+
+	/*
+	 * claim host busy
+	 */
+	info->scsi.phase = PHASE_SELECTION;
+	info->scsi.SCp = *arm_scsi_pointer(SCpnt);
+	info->SCpnt = SCpnt;
+	info->dma.transfer_type = fasdma_none;
+
+	fas216_log(info, LOG_ERROR, "sending bus device reset");
+
+	msgqueue_flush(&info->scsi.msgs);
+	msgqueue_addmsg(&info->scsi.msgs, 1, BUS_DEVICE_RESET);
+
+	/* following what the ESP driver says */
+	fas216_set_stc(info, 0);
+	fas216_cmd(info, CMD_NOP | CMD_WITHDMA);
+
+	/* flush FIFO */
+	fas216_cmd(info, CMD_FLUSHFIFO);
+
+	/* load bus-id and timeout */
+	fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id));
+	fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
+
+	/* synchronous transfers */
+	fas216_set_sync(info, SCpnt->device->id);
+
+	msg = msgqueue_getmsg(&info->scsi.msgs, 0);
+
+	fas216_writeb(info, REG_FF, BUS_DEVICE_RESET);
+	msg->fifo = 1;
+
+	fas216_cmd(info, CMD_SELECTATNSTOP);
+}
+
+/**
+ * fas216_kick - kick a command to the interface
+ * @info: our host interface to kick
+ *
+ * Kick a command to the interface, interface should be idle.
+ * Notes: Interrupts are always disabled!
+ */
+static void fas216_kick(FAS216_Info *info)
+{
+	struct scsi_cmnd *SCpnt = NULL;
+#define TYPE_OTHER	0
+#define TYPE_RESET	1
+#define TYPE_QUEUE	2
+	int where_from = TYPE_OTHER;
+
+	fas216_checkmagic(info);
+
+	/*
+	 * Obtain the next command to process.
+	 */
+	do {
+		if (info->rstSCpnt) {
+			SCpnt = info->rstSCpnt;
+			/* don't remove it */
+			where_from = TYPE_RESET;
+			break;
+		}
+
+		if (info->reqSCpnt) {
+			SCpnt = info->reqSCpnt;
+			info->reqSCpnt = NULL;
+			break;
+		}
+
+		if (info->origSCpnt) {
+			SCpnt = info->origSCpnt;
+			info->origSCpnt = NULL;
+			break;
+		}
+
+		/* retrieve next command */
+		if (!SCpnt) {
+			SCpnt = queue_remove_exclude(&info->queues.issue,
+						     info->busyluns);
+			where_from = TYPE_QUEUE;
+			break;
+		}
+	} while (0);
+
+	if (!SCpnt) {
+		/*
+		 * no command pending, so enable reselection.
+		 */
+		fas216_cmd(info, CMD_ENABLESEL);
+		return;
+	}
+
+	/*
+	 * We're going to start a command, so disable reselection
+	 */
+	fas216_cmd(info, CMD_DISABLESEL);
+
+	if (info->scsi.disconnectable && info->SCpnt) {
+		fas216_log(info, LOG_CONNECT,
+			"moved command for %d to disconnected queue",
+			info->SCpnt->device->id);
+		queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt);
+		info->scsi.disconnectable = 0;
+		info->SCpnt = NULL;
+	}
+
+	fas216_log_command(info, LOG_CONNECT | LOG_MESSAGES, SCpnt,
+			   "starting");
+
+	switch (where_from) {
+	case TYPE_QUEUE:
+		fas216_allocate_tag(info, SCpnt);
+		fallthrough;
+	case TYPE_OTHER:
+		fas216_start_command(info, SCpnt);
+		break;
+	case TYPE_RESET:
+		fas216_do_bus_device_reset(info, SCpnt);
+		break;
+	}
+
+	fas216_log(info, LOG_CONNECT, "select: data pointers [%p, %X]",
+		info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
+
+	/*
+	 * should now get either DISCONNECT or
+	 * (FUNCTION DONE with BUS SERVICE) interrupt
+	 */
+}
+
+/*
+ * Clean up from issuing a BUS DEVICE RESET message to a device.
+ */
+static void fas216_devicereset_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
+				    unsigned int result)
+{
+	fas216_log(info, LOG_ERROR, "fas216 device reset complete");
+
+	info->rstSCpnt = NULL;
+	info->rst_dev_status = 1;
+	wake_up(&info->eh_wait);
+}
+
+/**
+ * fas216_rq_sns_done - Finish processing automatic request sense command
+ * @info: interface that completed
+ * @SCpnt: command that completed
+ * @result: driver byte of result
+ *
+ * Finish processing automatic request sense command
+ */
+static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt,
+			       unsigned int result)
+{
+	struct scsi_pointer *scsi_pointer = arm_scsi_pointer(SCpnt);
+
+	fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
+		   "request sense complete, result=0x%04x%02x%02x",
+		   result, scsi_pointer->Message, scsi_pointer->Status);
+
+	if (result != DID_OK || scsi_pointer->Status != SAM_STAT_GOOD)
+		/*
+		 * Something went wrong.  Make sure that we don't
+		 * have valid data in the sense buffer that could
+		 * confuse the higher levels.
+		 */
+		memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
+//printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id);
+//{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); }
+	/*
+	 * Note that we don't set SCpnt->result, since that should
+	 * reflect the status of the command that we were asked by
+	 * the upper layers to process.  This would have been set
+	 * correctly by fas216_std_done.
+	 */
+	scsi_eh_restore_cmnd(SCpnt, &info->ses);
+	fas216_cmd_priv(SCpnt)->scsi_done(SCpnt);
+}
+
+/**
+ * fas216_std_done - finish processing of standard command
+ * @info: interface that completed
+ * @SCpnt: command that completed
+ * @result: driver byte of result
+ *
+ * Finish processing of standard command
+ */
+static void
+fas216_std_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result)
+{
+	struct scsi_pointer *scsi_pointer = arm_scsi_pointer(SCpnt);
+
+	info->stats.fins += 1;
+
+	set_host_byte(SCpnt, result);
+	if (result == DID_OK)
+		scsi_msg_to_host_byte(SCpnt, info->scsi.SCp.Message);
+	set_status_byte(SCpnt, info->scsi.SCp.Status);
+
+	fas216_log_command(info, LOG_CONNECT, SCpnt,
+		"command complete, result=0x%08x", SCpnt->result);
+
+	/*
+	 * If the driver detected an error, we're all done.
+	 */
+	if (get_host_byte(SCpnt) != DID_OK)
+		goto done;
+
+	/*
+	 * If the command returned CHECK_CONDITION or COMMAND_TERMINATED
+	 * status, request the sense information.
+	 */
+	if (get_status_byte(SCpnt) == SAM_STAT_CHECK_CONDITION ||
+	    get_status_byte(SCpnt) == SAM_STAT_COMMAND_TERMINATED)
+		goto request_sense;
+
+	/*
+	 * If the command did not complete with GOOD status,
+	 * we are all done here.
+	 */
+	if (get_status_byte(SCpnt) != SAM_STAT_GOOD)
+		goto done;
+
+	/*
+	 * We have successfully completed a command.  Make sure that
+	 * we do not have any buffers left to transfer.  The world
+	 * is not perfect, and we seem to occasionally hit this.
+	 * It can be indicative of a buggy driver, target or the upper
+	 * levels of the SCSI code.
+	 */
+	if (info->scsi.SCp.ptr) {
+		switch (SCpnt->cmnd[0]) {
+		case INQUIRY:
+		case START_STOP:
+		case MODE_SENSE:
+			break;
+
+		default:
+			scmd_printk(KERN_ERR, SCpnt,
+				    "incomplete data transfer detected: res=%08X ptr=%p len=%X\n",
+				    SCpnt->result, info->scsi.SCp.ptr,
+				    info->scsi.SCp.this_residual);
+			scsi_print_command(SCpnt);
+			set_host_byte(SCpnt, DID_ERROR);
+			goto request_sense;
+		}
+	}
+
+done:
+	if (fas216_cmd_priv(SCpnt)->scsi_done) {
+		fas216_cmd_priv(SCpnt)->scsi_done(SCpnt);
+		return;
+	}
+
+	panic("scsi%d.H: null scsi_done function in fas216_done",
+		info->host->host_no);
+
+
+request_sense:
+	if (SCpnt->cmnd[0] == REQUEST_SENSE)
+		goto done;
+
+	scsi_eh_prep_cmnd(SCpnt, &info->ses, NULL, 0, ~0);
+	fas216_log_target(info, LOG_CONNECT, SCpnt->device->id,
+			  "requesting sense");
+	init_SCp(SCpnt);
+	scsi_pointer->Message = 0;
+	scsi_pointer->Status = 0;
+	SCpnt->host_scribble = (void *)fas216_rq_sns_done;
+
+	/*
+	 * Place this command into the high priority "request
+	 * sense" slot.  This will be the very next command
+	 * executed, unless a target connects to us.
+	 */
+	if (info->reqSCpnt)
+		printk(KERN_WARNING "scsi%d.%c: losing request command\n",
+			info->host->host_no, '0' + SCpnt->device->id);
+	info->reqSCpnt = SCpnt;
+}
+
+/**
+ * fas216_done - complete processing for current command
+ * @info: interface that completed
+ * @result: driver byte of result
+ *
+ * Complete processing for current command
+ */
+static void fas216_done(FAS216_Info *info, unsigned int result)
+{
+	void (*fn)(FAS216_Info *, struct scsi_cmnd *, unsigned int);
+	struct scsi_cmnd *SCpnt;
+	unsigned long flags;
+
+	fas216_checkmagic(info);
+
+	if (!info->SCpnt)
+		goto no_command;
+
+	SCpnt = info->SCpnt;
+	info->SCpnt = NULL;
+    	info->scsi.phase = PHASE_IDLE;
+
+	if (info->scsi.aborting) {
+		fas216_log(info, 0, "uncaught abort - returning DID_ABORT");
+		result = DID_ABORT;
+		info->scsi.aborting = 0;
+	}
+
+	/*
+	 * Sanity check the completion - if we have zero bytes left
+	 * to transfer, we should not have a valid pointer.
+	 */
+	if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) {
+		scmd_printk(KERN_INFO, SCpnt,
+			    "zero bytes left to transfer, but buffer pointer still valid: ptr=%p len=%08x\n",
+			    info->scsi.SCp.ptr, info->scsi.SCp.this_residual);
+		info->scsi.SCp.ptr = NULL;
+		scsi_print_command(SCpnt);
+	}
+
+	/*
+	 * Clear down this command as completed.  If we need to request
+	 * the sense information, fas216_kick will re-assert the busy
+	 * status.
+	 */
+	info->device[SCpnt->device->id].parity_check = 0;
+	clear_bit(SCpnt->device->id * 8 +
+		  (u8)(SCpnt->device->lun & 0x7), info->busyluns);
+
+	fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble;
+	fn(info, SCpnt, result);
+
+	if (info->scsi.irq) {
+		spin_lock_irqsave(&info->host_lock, flags);
+		if (info->scsi.phase == PHASE_IDLE)
+			fas216_kick(info);
+		spin_unlock_irqrestore(&info->host_lock, flags);
+	}
+	return;
+
+no_command:
+	panic("scsi%d.H: null command in fas216_done",
+		info->host->host_no);
+}
+
+/**
+ * fas216_queue_command_internal - queue a command for the adapter to process
+ * @SCpnt: Command to queue
+ * @done: done function to call once command is complete
+ *
+ * Queue a command for adapter to process.
+ * Returns: 0 on success, else error.
+ * Notes: io_request_lock is held, interrupts are disabled.
+ */
+static int fas216_queue_command_internal(struct scsi_cmnd *SCpnt,
+					 void (*done)(struct scsi_cmnd *))
+{
+	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
+	int result;
+
+	fas216_checkmagic(info);
+
+	fas216_log_command(info, LOG_CONNECT, SCpnt,
+			   "received command (%p)", SCpnt);
+
+	fas216_cmd_priv(SCpnt)->scsi_done = done;
+	SCpnt->host_scribble = (void *)fas216_std_done;
+	SCpnt->result = 0;
+
+	init_SCp(SCpnt);
+
+	info->stats.queues += 1;
+
+	spin_lock(&info->host_lock);
+
+	/*
+	 * Add command into execute queue and let it complete under
+	 * whatever scheme we're using.
+	 */
+	result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt);
+
+	/*
+	 * If we successfully added the command,
+	 * kick the interface to get it moving.
+	 */
+	if (result == 0 && info->scsi.phase == PHASE_IDLE)
+		fas216_kick(info);
+	spin_unlock(&info->host_lock);
+
+	fas216_log_target(info, LOG_CONNECT, -1, "queue %s",
+		result ? "failure" : "success");
+
+	return result;
+}
+
+static int fas216_queue_command_lck(struct scsi_cmnd *SCpnt)
+{
+	return fas216_queue_command_internal(SCpnt, scsi_done);
+}
+
+DEF_SCSI_QCMD(fas216_queue_command)
+
+/**
+ * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command
+ * @SCpnt: Command to wake
+ *
+ * Trigger restart of a waiting thread in fas216_command
+ */
+static void fas216_internal_done(struct scsi_cmnd *SCpnt)
+{
+	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
+
+	fas216_checkmagic(info);
+
+	info->internal_done = 1;
+}
+
+/**
+ * fas216_noqueue_command - process a command for the adapter.
+ * @SCpnt: Command to queue
+ *
+ * Queue a command for adapter to process.
+ * Returns: scsi result code.
+ * Notes: io_request_lock is held, interrupts are disabled.
+ */
+static int fas216_noqueue_command_lck(struct scsi_cmnd *SCpnt)
+{
+	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
+
+	fas216_checkmagic(info);
+
+	/*
+	 * We should only be using this if we don't have an interrupt.
+	 * Provide some "incentive" to use the queueing code.
+	 */
+	BUG_ON(info->scsi.irq);
+
+	info->internal_done = 0;
+	fas216_queue_command_internal(SCpnt, fas216_internal_done);
+
+	/*
+	 * This wastes time, since we can't return until the command is
+	 * complete. We can't sleep either since we may get re-entered!
+	 * However, we must re-enable interrupts, or else we'll be
+	 * waiting forever.
+	 */
+	spin_unlock_irq(info->host->host_lock);
+
+	while (!info->internal_done) {
+		/*
+		 * If we don't have an IRQ, then we must poll the card for
+		 * it's interrupt, and use that to call this driver's
+		 * interrupt routine.  That way, we keep the command
+		 * progressing.  Maybe we can add some intelligence here
+		 * and go to sleep if we know that the device is going
+		 * to be some time (eg, disconnected).
+		 */
+		if (fas216_readb(info, REG_STAT) & STAT_INT) {
+			spin_lock_irq(info->host->host_lock);
+			fas216_intr(info);
+			spin_unlock_irq(info->host->host_lock);
+		}
+	}
+
+	spin_lock_irq(info->host->host_lock);
+
+	scsi_done(SCpnt);
+
+	return 0;
+}
+
+DEF_SCSI_QCMD(fas216_noqueue_command)
+
+/*
+ * Error handler timeout function.  Indicate that we timed out,
+ * and wake up any error handler process so it can continue.
+ */
+static void fas216_eh_timer(struct timer_list *t)
+{
+	FAS216_Info *info = from_timer(info, t, eh_timer);
+
+	fas216_log(info, LOG_ERROR, "error handling timed out\n");
+
+	del_timer(&info->eh_timer);
+
+	if (info->rst_bus_status == 0)
+		info->rst_bus_status = -1;
+	if (info->rst_dev_status == 0)
+		info->rst_dev_status = -1;
+
+	wake_up(&info->eh_wait);
+}
+
+enum res_find {
+	res_failed,		/* not found			*/
+	res_success,		/* command on issue queue	*/
+	res_hw_abort		/* command on disconnected dev	*/
+};
+
+/**
+ * fas216_do_abort - decide how to abort a command
+ * @SCpnt: command to abort
+ *
+ * Decide how to abort a command.
+ * Returns: abort status
+ */
+static enum res_find fas216_find_command(FAS216_Info *info,
+					 struct scsi_cmnd *SCpnt)
+{
+	enum res_find res = res_failed;
+
+	if (queue_remove_cmd(&info->queues.issue, SCpnt)) {
+		/*
+		 * The command was on the issue queue, and has not been
+		 * issued yet.  We can remove the command from the queue,
+		 * and acknowledge the abort.  Neither the device nor the
+		 * interface know about the command.
+		 */
+		printk("on issue queue ");
+
+		res = res_success;
+	} else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) {
+		/*
+		 * The command was on the disconnected queue.  We must
+		 * reconnect with the device if possible, and send it
+		 * an abort message.
+		 */
+		printk("on disconnected queue ");
+
+		res = res_hw_abort;
+	} else if (info->SCpnt == SCpnt) {
+		printk("executing ");
+
+		switch (info->scsi.phase) {
+		/*
+		 * If the interface is idle, and the command is 'disconnectable',
+		 * then it is the same as on the disconnected queue.
+		 */
+		case PHASE_IDLE:
+			if (info->scsi.disconnectable) {
+				info->scsi.disconnectable = 0;
+				info->SCpnt = NULL;
+				res = res_hw_abort;
+			}
+			break;
+
+		default:
+			break;
+		}
+	} else if (info->origSCpnt == SCpnt) {
+		/*
+		 * The command will be executed next, but a command
+		 * is currently using the interface.  This is similar to
+		 * being on the issue queue, except the busylun bit has
+		 * been set.
+		 */
+		info->origSCpnt = NULL;
+		clear_bit(SCpnt->device->id * 8 +
+			  (u8)(SCpnt->device->lun & 0x7), info->busyluns);
+		printk("waiting for execution ");
+		res = res_success;
+	} else
+		printk("unknown ");
+
+	return res;
+}
+
+/**
+ * fas216_eh_abort - abort this command
+ * @SCpnt: command to abort
+ *
+ * Abort this command.
+ * Returns: FAILED if unable to abort
+ * Notes: io_request_lock is taken, and irqs are disabled
+ */
+int fas216_eh_abort(struct scsi_cmnd *SCpnt)
+{
+	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
+	int result = FAILED;
+
+	fas216_checkmagic(info);
+
+	info->stats.aborts += 1;
+
+	scmd_printk(KERN_WARNING, SCpnt, "abort command\n");
+
+	print_debug_list();
+	fas216_dumpstate(info);
+
+	switch (fas216_find_command(info, SCpnt)) {
+	/*
+	 * We found the command, and cleared it out.  Either
+	 * the command is still known to be executing on the
+	 * target, or the busylun bit is not set.
+	 */
+	case res_success:
+		scmd_printk(KERN_WARNING, SCpnt, "abort %p success\n", SCpnt);
+		result = SUCCESS;
+		break;
+
+	/*
+	 * We need to reconnect to the target and send it an
+	 * ABORT or ABORT_TAG message.  We can only do this
+	 * if the bus is free.
+	 */
+	case res_hw_abort:
+
+	/*
+	 * We are unable to abort the command for some reason.
+	 */
+	default:
+	case res_failed:
+		scmd_printk(KERN_WARNING, SCpnt, "abort %p failed\n", SCpnt);
+		break;
+	}
+
+	return result;
+}
+
+/**
+ * fas216_eh_device_reset - Reset the device associated with this command
+ * @SCpnt: command specifing device to reset
+ *
+ * Reset the device associated with this command.
+ * Returns: FAILED if unable to reset.
+ * Notes: We won't be re-entered, so we'll only have one device
+ * reset on the go at one time.
+ */
+int fas216_eh_device_reset(struct scsi_cmnd *SCpnt)
+{
+	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
+	unsigned long flags;
+	int i, res = FAILED, target = SCpnt->device->id;
+
+	fas216_log(info, LOG_ERROR, "device reset for target %d", target);
+
+	spin_lock_irqsave(&info->host_lock, flags);
+
+	do {
+		/*
+		 * If we are currently connected to a device, and
+		 * it is the device we want to reset, there is
+		 * nothing we can do here.  Chances are it is stuck,
+		 * and we need a bus reset.
+		 */
+		if (info->SCpnt && !info->scsi.disconnectable &&
+		    info->SCpnt->device->id == SCpnt->device->id)
+			break;
+
+		/*
+		 * We're going to be resetting this device.  Remove
+		 * all pending commands from the driver.  By doing
+		 * so, we guarantee that we won't touch the command
+		 * structures except to process the reset request.
+		 */
+		queue_remove_all_target(&info->queues.issue, target);
+		queue_remove_all_target(&info->queues.disconnected, target);
+		if (info->origSCpnt && info->origSCpnt->device->id == target)
+			info->origSCpnt = NULL;
+		if (info->reqSCpnt && info->reqSCpnt->device->id == target)
+			info->reqSCpnt = NULL;
+		for (i = 0; i < 8; i++)
+			clear_bit(target * 8 + i, info->busyluns);
+
+		/*
+		 * Hijack this SCSI command structure to send
+		 * a bus device reset message to this device.
+		 */
+		SCpnt->host_scribble = (void *)fas216_devicereset_done;
+
+		info->rst_dev_status = 0;
+		info->rstSCpnt = SCpnt;
+
+		if (info->scsi.phase == PHASE_IDLE)
+			fas216_kick(info);
+
+		mod_timer(&info->eh_timer, jiffies + 30 * HZ);
+		spin_unlock_irqrestore(&info->host_lock, flags);
+
+		/*
+		 * Wait up to 30 seconds for the reset to complete.
+		 */
+		wait_event(info->eh_wait, info->rst_dev_status);
+
+		del_timer_sync(&info->eh_timer);
+		spin_lock_irqsave(&info->host_lock, flags);
+		info->rstSCpnt = NULL;
+
+		if (info->rst_dev_status == 1)
+			res = SUCCESS;
+	} while (0);
+
+	SCpnt->host_scribble = NULL;
+	spin_unlock_irqrestore(&info->host_lock, flags);
+
+	fas216_log(info, LOG_ERROR, "device reset complete: %s\n",
+		   res == SUCCESS ? "success" : "failed");
+
+	return res;
+}
+
+/**
+ * fas216_eh_bus_reset - Reset the bus associated with the command
+ * @SCpnt: command specifing bus to reset
+ *
+ * Reset the bus associated with the command.
+ * Returns: FAILED if unable to reset.
+ * Notes: Further commands are blocked.
+ */
+int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt)
+{
+	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
+	unsigned long flags;
+	struct scsi_device *SDpnt;
+
+	fas216_checkmagic(info);
+	fas216_log(info, LOG_ERROR, "resetting bus");
+
+	info->stats.bus_resets += 1;
+
+	spin_lock_irqsave(&info->host_lock, flags);
+
+	/*
+	 * Stop all activity on this interface.
+	 */
+	fas216_aborttransfer(info);
+	fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
+
+	/*
+	 * Clear any pending interrupts.
+	 */
+	while (fas216_readb(info, REG_STAT) & STAT_INT)
+		fas216_readb(info, REG_INST);
+
+	info->rst_bus_status = 0;
+
+	/*
+	 * For each attached hard-reset device, clear out
+	 * all command structures.  Leave the running
+	 * command in place.
+	 */
+	shost_for_each_device(SDpnt, info->host) {
+		int i;
+
+		if (SDpnt->soft_reset)
+			continue;
+
+		queue_remove_all_target(&info->queues.issue, SDpnt->id);
+		queue_remove_all_target(&info->queues.disconnected, SDpnt->id);
+		if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id)
+			info->origSCpnt = NULL;
+		if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id)
+			info->reqSCpnt = NULL;
+		info->SCpnt = NULL;
+
+		for (i = 0; i < 8; i++)
+			clear_bit(SDpnt->id * 8 + i, info->busyluns);
+	}
+
+	info->scsi.phase = PHASE_IDLE;
+
+	/*
+	 * Reset the SCSI bus.  Device cleanup happens in
+	 * the interrupt handler.
+	 */
+	fas216_cmd(info, CMD_RESETSCSI);
+
+	mod_timer(&info->eh_timer, jiffies + HZ);
+	spin_unlock_irqrestore(&info->host_lock, flags);
+
+	/*
+	 * Wait one second for the interrupt.
+	 */
+	wait_event(info->eh_wait, info->rst_bus_status);
+	del_timer_sync(&info->eh_timer);
+
+	fas216_log(info, LOG_ERROR, "bus reset complete: %s\n",
+		   info->rst_bus_status == 1 ? "success" : "failed");
+
+	return info->rst_bus_status == 1 ? SUCCESS : FAILED;
+}
+
+/**
+ * fas216_init_chip - Initialise FAS216 state after reset
+ * @info: state structure for interface
+ *
+ * Initialise FAS216 state after reset
+ */
+static void fas216_init_chip(FAS216_Info *info)
+{
+	unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7;
+	fas216_writeb(info, REG_CLKF, clock);
+	fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
+	fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]);
+	fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]);
+	fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout);
+	fas216_writeb(info, REG_SOF, 0);
+	fas216_writeb(info, REG_STP, info->scsi.async_stp);
+	fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
+}
+
+/**
+ * fas216_eh_host_reset - Reset the host associated with this command
+ * @SCpnt: command specifing host to reset
+ *
+ * Reset the host associated with this command.
+ * Returns: FAILED if unable to reset.
+ * Notes: io_request_lock is taken, and irqs are disabled
+ */
+int fas216_eh_host_reset(struct scsi_cmnd *SCpnt)
+{
+	FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata;
+
+	spin_lock_irq(info->host->host_lock);
+
+	fas216_checkmagic(info);
+
+	fas216_log(info, LOG_ERROR, "resetting host");
+
+	/*
+	 * Reset the SCSI chip.
+	 */
+	fas216_cmd(info, CMD_RESETCHIP);
+
+	/*
+	 * Ugly ugly ugly!
+	 * We need to release the host_lock and enable
+	 * IRQs if we sleep, but we must relock and disable
+	 * IRQs after the sleep.
+	 */
+	spin_unlock_irq(info->host->host_lock);
+	msleep(50 * 1000/100);
+	spin_lock_irq(info->host->host_lock);
+
+	/*
+	 * Release the SCSI reset.
+	 */
+	fas216_cmd(info, CMD_NOP);
+
+	fas216_init_chip(info);
+
+	spin_unlock_irq(info->host->host_lock);
+	return SUCCESS;
+}
+
+#define TYPE_UNKNOWN	0
+#define TYPE_NCR53C90	1
+#define TYPE_NCR53C90A	2
+#define TYPE_NCR53C9x	3
+#define TYPE_Am53CF94	4
+#define TYPE_EmFAS216	5
+#define TYPE_QLFAS216	6
+
+static char *chip_types[] = {
+	"unknown",
+	"NS NCR53C90",
+	"NS NCR53C90A",
+	"NS NCR53C9x",
+	"AMD Am53CF94",
+	"Emulex FAS216",
+	"QLogic FAS216"
+};
+
+static int fas216_detect_type(FAS216_Info *info)
+{
+	int family, rev;
+
+	/*
+	 * Reset the chip.
+	 */
+	fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
+	udelay(50);
+	fas216_writeb(info, REG_CMD, CMD_NOP);
+
+	/*
+	 * Check to see if control reg 2 is present.
+	 */
+	fas216_writeb(info, REG_CNTL3, 0);
+	fas216_writeb(info, REG_CNTL2, CNTL2_S2FE);
+
+	/*
+	 * If we are unable to read back control reg 2
+	 * correctly, it is not present, and we have a
+	 * NCR53C90.
+	 */
+	if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE)
+		return TYPE_NCR53C90;
+
+	/*
+	 * Now, check control register 3
+	 */
+	fas216_writeb(info, REG_CNTL2, 0);
+	fas216_writeb(info, REG_CNTL3, 0);
+	fas216_writeb(info, REG_CNTL3, 5);
+
+	/*
+	 * If we are unable to read the register back
+	 * correctly, we have a NCR53C90A
+	 */
+	if (fas216_readb(info, REG_CNTL3) != 5)
+		return TYPE_NCR53C90A;
+
+	/*
+	 * Now read the ID from the chip.
+	 */
+	fas216_writeb(info, REG_CNTL3, 0);
+
+	fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK);
+	fas216_writeb(info, REG_CNTL3, 0);
+
+	fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
+	udelay(50);
+	fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP);
+
+	fas216_writeb(info, REG_CNTL2, CNTL2_ENF);
+	fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
+	udelay(50);
+	fas216_writeb(info, REG_CMD, CMD_NOP);
+
+	rev     = fas216_readb(info, REG_ID);
+	family  = rev >> 3;
+	rev    &= 7;
+
+	switch (family) {
+	case 0x01:
+		if (rev == 4)
+			return TYPE_Am53CF94;
+		break;
+
+	case 0x02:
+		switch (rev) {
+		case 2:
+			return TYPE_EmFAS216;
+		case 3:
+			return TYPE_QLFAS216;
+		}
+		break;
+
+	default:
+		break;
+	}
+	printk("family %x rev %x\n", family, rev);
+	return TYPE_NCR53C9x;
+}
+
+/**
+ * fas216_reset_state - Initialise driver internal state
+ * @info: state to initialise
+ *
+ * Initialise driver internal state
+ */
+static void fas216_reset_state(FAS216_Info *info)
+{
+	int i;
+
+	fas216_checkmagic(info);
+
+	fas216_bus_reset(info);
+
+	/*
+	 * Clear out all stale info in our state structure
+	 */
+	memset(info->busyluns, 0, sizeof(info->busyluns));
+	info->scsi.disconnectable = 0;
+	info->scsi.aborting = 0;
+
+	for (i = 0; i < 8; i++) {
+		info->device[i].parity_enabled	= 0;
+		info->device[i].parity_check	= 1;
+	}
+
+	/*
+	 * Drain all commands on disconnected queue
+	 */
+	while (queue_remove(&info->queues.disconnected) != NULL);
+
+	/*
+	 * Remove executing commands.
+	 */
+	info->SCpnt     = NULL;
+	info->reqSCpnt  = NULL;
+	info->rstSCpnt  = NULL;
+	info->origSCpnt = NULL;
+}
+
+/**
+ * fas216_init - initialise FAS/NCR/AMD SCSI structures.
+ * @host: a driver-specific filled-out structure
+ *
+ * Initialise FAS/NCR/AMD SCSI structures.
+ * Returns: 0 on success
+ */
+int fas216_init(struct Scsi_Host *host)
+{
+	FAS216_Info *info = (FAS216_Info *)host->hostdata;
+
+	info->magic_start    = MAGIC;
+	info->magic_end      = MAGIC;
+	info->host           = host;
+	info->scsi.cfg[0]    = host->this_id | CNTL1_PERE;
+	info->scsi.cfg[1]    = CNTL2_ENF | CNTL2_S2FE;
+	info->scsi.cfg[2]    = info->ifcfg.cntl3 |
+			       CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM;
+	info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod);
+
+	info->rst_dev_status = -1;
+	info->rst_bus_status = -1;
+	init_waitqueue_head(&info->eh_wait);
+	timer_setup(&info->eh_timer, fas216_eh_timer, 0);
+	
+	spin_lock_init(&info->host_lock);
+
+	memset(&info->stats, 0, sizeof(info->stats));
+
+	msgqueue_initialise(&info->scsi.msgs);
+
+	if (!queue_initialise(&info->queues.issue))
+		return -ENOMEM;
+
+	if (!queue_initialise(&info->queues.disconnected)) {
+		queue_free(&info->queues.issue);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+/**
+ * fas216_add - initialise FAS/NCR/AMD SCSI ic.
+ * @host: a driver-specific filled-out structure
+ * @dev: parent device
+ *
+ * Initialise FAS/NCR/AMD SCSI ic.
+ * Returns: 0 on success
+ */
+int fas216_add(struct Scsi_Host *host, struct device *dev)
+{
+	FAS216_Info *info = (FAS216_Info *)host->hostdata;
+	int type, ret;
+
+	if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) {
+		printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n",
+			info->ifcfg.clockrate);
+		return -EINVAL;
+	}
+
+	fas216_reset_state(info);
+	type = fas216_detect_type(info);
+	info->scsi.type = chip_types[type];
+
+	udelay(300);
+
+	/*
+	 * Initialise the chip correctly.
+	 */
+	fas216_init_chip(info);
+
+	/*
+	 * Reset the SCSI bus.  We don't want to see
+	 * the resulting reset interrupt, so mask it
+	 * out.
+	 */
+	fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR);
+	fas216_writeb(info, REG_CMD, CMD_RESETSCSI);
+
+	/*
+	 * scsi standard says wait 250ms
+	 */
+	spin_unlock_irq(info->host->host_lock);
+	msleep(100*1000/100);
+	spin_lock_irq(info->host->host_lock);
+
+	fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]);
+	fas216_readb(info, REG_INST);
+
+	fas216_checkmagic(info);
+
+	ret = scsi_add_host(host, dev);
+	if (ret)
+		fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
+	else
+		scsi_scan_host(host);
+
+	return ret;
+}
+
+void fas216_remove(struct Scsi_Host *host)
+{
+	FAS216_Info *info = (FAS216_Info *)host->hostdata;
+
+	fas216_checkmagic(info);
+	scsi_remove_host(host);
+
+	fas216_writeb(info, REG_CMD, CMD_RESETCHIP);
+	scsi_host_put(host);
+}
+
+/**
+ * fas216_release - release all resources for FAS/NCR/AMD SCSI ic.
+ * @host: a driver-specific filled-out structure
+ *
+ * release all resources and put everything to bed for FAS/NCR/AMD SCSI ic.
+ */
+void fas216_release(struct Scsi_Host *host)
+{
+	FAS216_Info *info = (FAS216_Info *)host->hostdata;
+
+	queue_free(&info->queues.disconnected);
+	queue_free(&info->queues.issue);
+}
+
+void fas216_print_host(FAS216_Info *info, struct seq_file *m)
+{
+	seq_printf(m,
+			"\n"
+			"Chip    : %s\n"
+			" Address: 0x%p\n"
+			" IRQ    : %d\n"
+			" DMA    : %d\n",
+			info->scsi.type, info->scsi.io_base,
+			info->scsi.irq, info->scsi.dma);
+}
+
+void fas216_print_stats(FAS216_Info *info, struct seq_file *m)
+{
+	seq_printf(m, "\n"
+			"Command Statistics:\n"
+			" Queued     : %u\n"
+			" Issued     : %u\n"
+			" Completed  : %u\n"
+			" Reads      : %u\n"
+			" Writes     : %u\n"
+			" Others     : %u\n"
+			" Disconnects: %u\n"
+			" Aborts     : %u\n"
+			" Bus resets : %u\n"
+			" Host resets: %u\n",
+			info->stats.queues,	 info->stats.removes,
+			info->stats.fins,	 info->stats.reads,
+			info->stats.writes,	 info->stats.miscs,
+			info->stats.disconnects, info->stats.aborts,
+			info->stats.bus_resets,	 info->stats.host_resets);
+}
+
+void fas216_print_devices(FAS216_Info *info, struct seq_file *m)
+{
+	struct fas216_device *dev;
+	struct scsi_device *scd;
+
+	seq_puts(m, "Device/Lun TaggedQ       Parity   Sync\n");
+
+	shost_for_each_device(scd, info->host) {
+		dev = &info->device[scd->id];
+		seq_printf(m, "     %d/%llu   ", scd->id, scd->lun);
+		if (scd->tagged_supported)
+			seq_printf(m, "%3sabled ",
+				     scd->simple_tags ? "en" : "dis");
+		else
+			seq_puts(m, "unsupported   ");
+
+		seq_printf(m, "%3sabled ", dev->parity_enabled ? "en" : "dis");
+
+		if (dev->sof)
+			seq_printf(m, "offset %d, %d ns\n",
+				     dev->sof, dev->period * 4);
+		else
+			seq_puts(m, "async\n");
+	}
+}
+
+EXPORT_SYMBOL(fas216_init);
+EXPORT_SYMBOL(fas216_add);
+EXPORT_SYMBOL(fas216_queue_command);
+EXPORT_SYMBOL(fas216_noqueue_command);
+EXPORT_SYMBOL(fas216_intr);
+EXPORT_SYMBOL(fas216_remove);
+EXPORT_SYMBOL(fas216_release);
+EXPORT_SYMBOL(fas216_eh_abort);
+EXPORT_SYMBOL(fas216_eh_device_reset);
+EXPORT_SYMBOL(fas216_eh_bus_reset);
+EXPORT_SYMBOL(fas216_eh_host_reset);
+EXPORT_SYMBOL(fas216_print_host);
+EXPORT_SYMBOL(fas216_print_stats);
+EXPORT_SYMBOL(fas216_print_devices);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core");
+MODULE_LICENSE("GPL");
diff --git a/drivers/scsi/arm/fas216.h b/drivers/scsi/arm/fas216.h
new file mode 100644
index 000000000..08113277a
--- /dev/null
+++ b/drivers/scsi/arm/fas216.h
@@ -0,0 +1,404 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ *  linux/drivers/acorn/scsi/fas216.h
+ *
+ *  Copyright (C) 1997-2000 Russell King
+ *
+ *  FAS216 generic driver
+ */
+#ifndef FAS216_H
+#define FAS216_H
+
+#include <scsi/scsi_eh.h>
+
+#include "queue.h"
+#include "msgqueue.h"
+
+/* FAS register definitions */
+
+/* transfer count low */
+#define REG_CTCL		(0)
+#define REG_STCL		(0)
+
+/* transfer count medium */
+#define REG_CTCM		(1)
+#define REG_STCM		(1)
+
+/* fifo data */
+#define REG_FF			(2)
+
+/* command */
+#define REG_CMD			(3)
+#define CMD_NOP			0x00
+#define CMD_FLUSHFIFO		0x01
+#define CMD_RESETCHIP		0x02
+#define CMD_RESETSCSI		0x03
+
+#define CMD_TRANSFERINFO	0x10
+#define CMD_INITCMDCOMPLETE	0x11
+#define CMD_MSGACCEPTED		0x12
+#define CMD_PADBYTES		0x18
+#define CMD_SETATN		0x1a
+#define CMD_RSETATN		0x1b
+
+#define CMD_SELECTWOATN		0x41
+#define CMD_SELECTATN		0x42
+#define CMD_SELECTATNSTOP	0x43
+#define CMD_ENABLESEL		0x44
+#define CMD_DISABLESEL		0x45
+#define CMD_SELECTATN3		0x46
+#define CMD_RESEL3		0x47
+
+#define CMD_WITHDMA		0x80
+
+/* status register (read) */
+#define REG_STAT		(4)
+#define STAT_IO			(1 << 0)			/* IO phase		*/
+#define STAT_CD			(1 << 1)			/* CD phase		*/
+#define STAT_MSG		(1 << 2)			/* MSG phase		*/
+#define STAT_TRANSFERDONE	(1 << 3)			/* Transfer completed	*/
+#define STAT_TRANSFERCNTZ	(1 << 4)			/* Transfer counter is zero */
+#define STAT_PARITYERROR	(1 << 5)			/* Parity error		*/
+#define STAT_REALBAD		(1 << 6)			/* Something bad	*/
+#define STAT_INT		(1 << 7)			/* Interrupt		*/
+
+#define STAT_BUSMASK		(STAT_MSG|STAT_CD|STAT_IO)
+#define STAT_DATAOUT		(0)				/* Data out		*/
+#define STAT_DATAIN		(STAT_IO)			/* Data in		*/
+#define STAT_COMMAND		(STAT_CD)			/* Command out		*/
+#define STAT_STATUS		(STAT_CD|STAT_IO)		/* Status In		*/
+#define STAT_MESGOUT		(STAT_MSG|STAT_CD)		/* Message out		*/
+#define STAT_MESGIN		(STAT_MSG|STAT_CD|STAT_IO)	/* Message In		*/
+
+/* bus ID for select / reselect */
+#define REG_SDID		(4)
+#define BUSID(target)		((target) & 7)
+
+/* Interrupt status register (read) */
+#define REG_INST		(5)
+#define INST_SELWOATN		(1 << 0)			/* Select w/o ATN	*/
+#define INST_SELATN		(1 << 1)			/* Select w/ATN		*/
+#define INST_RESELECTED		(1 << 2)			/* Reselected		*/
+#define INST_FUNCDONE		(1 << 3)			/* Function done	*/
+#define INST_BUSSERVICE		(1 << 4)			/* Bus service		*/
+#define INST_DISCONNECT		(1 << 5)			/* Disconnect		*/
+#define INST_ILLEGALCMD		(1 << 6)			/* Illegal command	*/
+#define INST_BUSRESET		(1 << 7)			/* SCSI Bus reset	*/
+
+/* Timeout register (write) */
+#define REG_STIM		(5)
+
+/* Sequence step register (read) */
+#define REG_IS			(6)
+#define IS_BITS			0x07
+#define IS_SELARB		0x00				/* Select & Arb ok	*/
+#define IS_MSGBYTESENT		0x01				/* One byte message sent*/
+#define IS_NOTCOMMAND		0x02				/* Not in command state	*/
+#define IS_EARLYPHASE		0x03				/* Early phase change	*/
+#define IS_COMPLETE		0x04				/* Command ok		*/
+#define IS_SOF			0x08				/* Sync off flag	*/
+
+/* Transfer period step (write) */
+#define REG_STP			(6)
+
+/* Synchronous Offset (write) */
+#define REG_SOF			(7)
+
+/* Fifo state register (read) */
+#define REG_CFIS		(7)
+#define CFIS_CF			0x1f				/* Num bytes in FIFO	*/
+#define CFIS_IS			0xe0				/* Step			*/
+
+/* config register 1 */
+#define REG_CNTL1		(8)
+#define CNTL1_CID		(7 << 0)			/* Chip ID			*/
+#define CNTL1_STE		(1 << 3)			/* Self test enable		*/
+#define CNTL1_PERE		(1 << 4)			/* Parity enable reporting en.	*/
+#define CNTL1_PTE		(1 << 5)			/* Parity test enable		*/
+#define CNTL1_DISR		(1 << 6)			/* Disable Irq on SCSI reset	*/
+#define CNTL1_ETM		(1 << 7)			/* Extended Timing Mode		*/
+
+/* Clock conversion factor (read) */
+#define REG_CLKF		(9)
+#define CLKF_F37MHZ		0x00				/* 35.01 - 40 MHz		*/
+#define CLKF_F10MHZ		0x02				/* 10 MHz			*/
+#define CLKF_F12MHZ		0x03				/* 10.01 - 15 MHz		*/
+#define CLKF_F17MHZ		0x04				/* 15.01 - 20 MHz		*/
+#define CLKF_F22MHZ		0x05				/* 20.01 - 25 MHz		*/
+#define CLKF_F27MHZ		0x06				/* 25.01 - 30 MHz		*/
+#define CLKF_F32MHZ		0x07				/* 30.01 - 35 MHz		*/
+
+/* Chip test register (write) */
+#define REG_FTM			(10)
+#define TEST_FTM		0x01				/* Force target mode		*/
+#define TEST_FIM		0x02				/* Force initiator mode		*/
+#define TEST_FHI		0x04				/* Force high impedance mode	*/
+
+/* Configuration register 2 (read/write) */
+#define REG_CNTL2		(11)
+#define CNTL2_PGDP		(1 << 0)			/* Pass Th/Generate Data Parity	*/
+#define CNTL2_PGRP		(1 << 1)			/* Pass Th/Generate Reg Parity	*/
+#define CNTL2_ACDPE		(1 << 2)			/* Abort on Cmd/Data Parity Err	*/
+#define CNTL2_S2FE		(1 << 3)			/* SCSI2 Features Enable	*/
+#define CNTL2_TSDR		(1 << 4)			/* Tristate DREQ		*/
+#define CNTL2_SBO		(1 << 5)			/* Select Byte Order		*/
+#define CNTL2_ENF		(1 << 6)			/* Enable features		*/
+#define CNTL2_DAE		(1 << 7)			/* Data Alignment Enable	*/
+
+/* Configuration register 3 (read/write) */
+#define REG_CNTL3		(12)
+#define CNTL3_BS8		(1 << 0)			/* Burst size 8			*/
+#define CNTL3_MDM		(1 << 1)			/* Modify DMA mode		*/
+#define CNTL3_LBTM		(1 << 2)			/* Last Byte Transfer mode	*/
+#define CNTL3_FASTCLK		(1 << 3)			/* Fast SCSI clocking		*/
+#define CNTL3_FASTSCSI		(1 << 4)			/* Fast SCSI			*/
+#define CNTL3_G2CB		(1 << 5)			/* Group2 SCSI support		*/
+#define CNTL3_QTAG		(1 << 6)			/* Enable 3 byte msgs		*/
+#define CNTL3_ADIDCHK		(1 << 7)			/* Additional ID check		*/
+
+/* High transfer count (read/write) */
+#define REG_CTCH		(14)
+#define REG_STCH		(14)
+
+/* ID register (read only) */
+#define REG_ID			(14)
+
+/* Data alignment */
+#define REG_DAL			(15)
+
+typedef enum {
+	PHASE_IDLE,					/* we're not planning on doing anything	*/
+	PHASE_SELECTION,				/* selecting a device			*/
+	PHASE_SELSTEPS,					/* selection with command steps		*/
+	PHASE_COMMAND,					/* command sent				*/
+	PHASE_MESSAGESENT,				/* selected, and we're sending cmd	*/
+	PHASE_DATAOUT,					/* data out to device			*/
+	PHASE_DATAIN,					/* data in from device			*/
+	PHASE_MSGIN,					/* message in from device		*/
+	PHASE_MSGIN_DISCONNECT,				/* disconnecting from bus		*/
+	PHASE_MSGOUT,					/* after message out phase		*/
+	PHASE_MSGOUT_EXPECT,				/* expecting message out		*/
+	PHASE_STATUS,					/* status from device			*/
+	PHASE_DONE					/* Command complete			*/
+} phase_t;
+
+typedef enum {
+	DMA_OUT,					/* DMA from memory to chip		*/
+	DMA_IN						/* DMA from chip to memory		*/
+} fasdmadir_t;
+
+typedef enum {
+	fasdma_none,					/* No dma				*/
+	fasdma_pio,					/* PIO mode				*/
+	fasdma_pseudo,					/* Pseudo DMA				*/
+	fasdma_real_block,				/* Real DMA, on block by block basis	*/
+	fasdma_real_all					/* Real DMA, on request by request	*/
+} fasdmatype_t;
+
+typedef enum {
+	neg_wait,					/* Negotiate with device		*/
+	neg_inprogress,					/* Negotiation sent			*/
+	neg_complete,					/* Negotiation complete			*/
+	neg_targcomplete,				/* Target completed negotiation		*/
+	neg_invalid					/* Negotiation not supported		*/
+} neg_t;
+
+#define MAGIC	0x441296bdUL
+#define NR_MSGS	8
+
+#define FASCAP_DMA		(1 << 0)
+#define FASCAP_PSEUDODMA	(1 << 1)
+
+typedef struct {
+	unsigned long		magic_start;
+	spinlock_t		host_lock;
+	struct Scsi_Host	*host;			/* host					*/
+	struct scsi_cmnd	*SCpnt;			/* currently processing command		*/
+	struct scsi_cmnd	*origSCpnt;		/* original connecting command		*/
+	struct scsi_cmnd	*reqSCpnt;		/* request sense command		*/
+	struct scsi_cmnd	*rstSCpnt;		/* reset command			*/
+	struct scsi_cmnd	*pending_SCpnt[8];	/* per-device pending commands		*/
+	int			next_pending;		/* next pending device			*/
+
+	/*
+	 * Error recovery
+	 */
+	wait_queue_head_t	eh_wait;
+	struct timer_list	eh_timer;
+	unsigned int		rst_dev_status;
+	unsigned int		rst_bus_status;
+
+	/* driver information */
+	struct {
+		phase_t		phase;			/* current phase			*/
+		void __iomem	*io_base;		/* iomem base of FAS216			*/
+		unsigned int	io_shift;		/* shift to adjust reg offsets by	*/
+		unsigned char	cfg[4];			/* configuration registers		*/
+		const char	*type;			/* chip type				*/
+		unsigned int	irq;			/* interrupt				*/
+		int		dma;			/* dma channel				*/
+
+		struct scsi_pointer	SCp;			/* current commands data pointer	*/
+
+		MsgQueue_t	msgs;			/* message queue for connected device	*/
+
+		unsigned int	async_stp;		/* Async transfer STP value		*/
+		unsigned char	msgin_fifo;		/* bytes in fifo at time of message in	*/
+		unsigned char	message[256];		/* last message received from device	*/
+
+		unsigned char	disconnectable:1;	/* this command can be disconnected	*/
+		unsigned char	aborting:1;		/* aborting command			*/
+	} scsi;
+
+	/* statistics information */
+	struct {
+		unsigned int	queues;
+		unsigned int	removes;
+		unsigned int	fins;
+		unsigned int	reads;
+		unsigned int	writes;
+		unsigned int	miscs;
+		unsigned int	disconnects;
+		unsigned int	aborts;
+		unsigned int	bus_resets;
+		unsigned int	host_resets;
+	} stats;
+
+	/* configuration information */
+	struct {
+		unsigned char	clockrate;		/* clock rate of FAS device (MHz)	*/
+		unsigned char	select_timeout;		/* timeout (R5)				*/
+		unsigned char	sync_max_depth;		/* Synchronous xfer max fifo depth	*/
+		unsigned char	wide_max_size;		/* Maximum wide transfer size		*/
+		unsigned char	cntl3;			/* Control Reg 3			*/
+		unsigned int	asyncperiod;		/* Async transfer period (ns)		*/
+		unsigned int	capabilities;		/* driver capabilities			*/
+		unsigned int	disconnect_ok:1;	/* Disconnects allowed?			*/
+	} ifcfg;
+
+	/* queue handling */
+	struct {
+	    	Queue_t		issue;			/* issue queue				*/
+    		Queue_t		disconnected;		/* disconnected command queue		*/
+	} queues;
+
+	/* per-device info */
+	struct fas216_device {
+		unsigned char	disconnect_ok:1;	/* device can disconnect		*/
+		unsigned char	parity_enabled:1;	/* parity checking enabled		*/
+		unsigned char	parity_check:1;		/* need to check parity checking	*/
+		unsigned char	period;			/* sync xfer period in (*4ns)		*/
+		unsigned char	stp;			/* synchronous transfer period		*/
+		unsigned char	sof;			/* synchronous offset register		*/
+		unsigned char	wide_xfer;		/* currently negociated wide transfer	*/
+		neg_t		sync_state;		/* synchronous transfer mode		*/
+		neg_t		wide_state;		/* wide transfer mode			*/
+	} device[8];
+	unsigned long	busyluns[64/sizeof(unsigned long)];/* array of bits indicating LUNs busy	*/
+
+	/* dma */
+	struct {
+		fasdmatype_t	transfer_type;		/* current type of DMA transfer		*/
+		fasdmatype_t	(*setup) (struct Scsi_Host *host, struct scsi_pointer *SCp, fasdmadir_t direction, fasdmatype_t min_dma);
+		void		(*pseudo)(struct Scsi_Host *host, struct scsi_pointer *SCp, fasdmadir_t direction, int transfer);
+		void		(*stop)  (struct Scsi_Host *host, struct scsi_pointer *SCp);
+	} dma;
+
+	/* miscellaneous */
+	int			internal_done;		/* flag to indicate request done */
+	struct scsi_eh_save	ses;		/* holds request sense restore info */
+	unsigned long		magic_end;
+} FAS216_Info;
+
+/* driver-private data per SCSI command. */
+struct fas216_cmd_priv {
+	/*
+	 * @scsi_pointer must be the first member. See also arm_scsi_pointer().
+	 */
+	struct scsi_pointer scsi_pointer;
+	void (*scsi_done)(struct scsi_cmnd *cmd);
+};
+
+static inline struct fas216_cmd_priv *fas216_cmd_priv(struct scsi_cmnd *cmd)
+{
+	return scsi_cmd_priv(cmd);
+}
+
+/* Function: int fas216_init (struct Scsi_Host *instance)
+ * Purpose : initialise FAS/NCR/AMD SCSI structures.
+ * Params  : instance - a driver-specific filled-out structure
+ * Returns : 0 on success
+ */
+extern int fas216_init (struct Scsi_Host *instance);
+
+/* Function: int fas216_add (struct Scsi_Host *instance, struct device *dev)
+ * Purpose : initialise FAS/NCR/AMD SCSI ic.
+ * Params  : instance - a driver-specific filled-out structure
+ * Returns : 0 on success
+ */
+extern int fas216_add (struct Scsi_Host *instance, struct device *dev);
+
+/* Function: int fas216_queue_command(struct Scsi_Host *h, struct scsi_cmnd *SCpnt)
+ * Purpose : queue a command for adapter to process.
+ * Params  : h - host adapter
+ *	   : SCpnt - Command to queue
+ * Returns : 0 - success, else error
+ */
+extern int fas216_queue_command(struct Scsi_Host *h, struct scsi_cmnd *SCpnt);
+
+/* Function: int fas216_noqueue_command(struct Scsi_Host *h, struct scsi_cmnd *SCpnt)
+ * Purpose : queue a command for adapter to process, and process it to completion.
+ * Params  : h - host adapter
+ *	   : SCpnt - Command to queue
+ * Returns : 0 - success, else error
+ */
+extern int fas216_noqueue_command(struct Scsi_Host *, struct scsi_cmnd *);
+
+/* Function: irqreturn_t fas216_intr (FAS216_Info *info)
+ * Purpose : handle interrupts from the interface to progress a command
+ * Params  : info - interface to service
+ */
+extern irqreturn_t fas216_intr (FAS216_Info *info);
+
+extern void fas216_remove (struct Scsi_Host *instance);
+
+/* Function: void fas216_release (struct Scsi_Host *instance)
+ * Purpose : release all resources and put everything to bed for FAS/NCR/AMD SCSI ic.
+ * Params  : instance - a driver-specific filled-out structure
+ * Returns : 0 on success
+ */
+extern void fas216_release (struct Scsi_Host *instance);
+
+extern void fas216_print_host(FAS216_Info *info, struct seq_file *m);
+extern void fas216_print_stats(FAS216_Info *info, struct seq_file *m);
+extern void fas216_print_devices(FAS216_Info *info, struct seq_file *m);
+
+/* Function: int fas216_eh_abort(struct scsi_cmnd *SCpnt)
+ * Purpose : abort this command
+ * Params  : SCpnt - command to abort
+ * Returns : FAILED if unable to abort
+ */
+extern int fas216_eh_abort(struct scsi_cmnd *SCpnt);
+
+/* Function: int fas216_eh_device_reset(struct scsi_cmnd *SCpnt)
+ * Purpose : Reset the device associated with this command
+ * Params  : SCpnt - command specifing device to reset
+ * Returns : FAILED if unable to reset
+ */
+extern int fas216_eh_device_reset(struct scsi_cmnd *SCpnt);
+
+/* Function: int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt)
+ * Purpose : Reset the complete bus associated with this command
+ * Params  : SCpnt - command specifing bus to reset
+ * Returns : FAILED if unable to reset
+ */
+extern int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt);
+
+/* Function: int fas216_eh_host_reset(struct scsi_cmnd *SCpnt)
+ * Purpose : Reset the host associated with this command
+ * Params  : SCpnt - command specifing host to reset
+ * Returns : FAILED if unable to reset
+ */
+extern int fas216_eh_host_reset(struct scsi_cmnd *SCpnt);
+
+#endif /* FAS216_H */
diff --git a/drivers/scsi/arm/msgqueue.c b/drivers/scsi/arm/msgqueue.c
new file mode 100644
index 000000000..581158313
--- /dev/null
+++ b/drivers/scsi/arm/msgqueue.c
@@ -0,0 +1,168 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  linux/drivers/acorn/scsi/msgqueue.c
+ *
+ *  Copyright (C) 1997-1998 Russell King
+ *
+ *  message queue handling
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/stddef.h>
+#include <linux/init.h>
+
+#include "msgqueue.h"
+
+/*
+ * Function: struct msgqueue_entry *mqe_alloc(MsgQueue_t *msgq)
+ * Purpose : Allocate a message queue entry
+ * Params  : msgq - message queue to claim entry for
+ * Returns : message queue entry or NULL.
+ */
+static struct msgqueue_entry *mqe_alloc(MsgQueue_t *msgq)
+{
+	struct msgqueue_entry *mq;
+
+	if ((mq = msgq->free) != NULL)
+		msgq->free = mq->next;
+
+	return mq;
+}
+
+/*
+ * Function: void mqe_free(MsgQueue_t *msgq, struct msgqueue_entry *mq)
+ * Purpose : free a message queue entry
+ * Params  : msgq - message queue to free entry from
+ *	     mq   - message queue entry to free
+ */
+static void mqe_free(MsgQueue_t *msgq, struct msgqueue_entry *mq)
+{
+	if (mq) {
+		mq->next = msgq->free;
+		msgq->free = mq;
+	}
+}
+
+/*
+ * Function: void msgqueue_initialise(MsgQueue_t *msgq)
+ * Purpose : initialise a message queue
+ * Params  : msgq - queue to initialise
+ */
+void msgqueue_initialise(MsgQueue_t *msgq)
+{
+	int i;
+
+	msgq->qe = NULL;
+	msgq->free = &msgq->entries[0];
+
+	for (i = 0; i < NR_MESSAGES; i++)
+		msgq->entries[i].next = &msgq->entries[i + 1];
+
+	msgq->entries[NR_MESSAGES - 1].next = NULL;
+}
+
+
+/*
+ * Function: void msgqueue_free(MsgQueue_t *msgq)
+ * Purpose : free a queue
+ * Params  : msgq - queue to free
+ */
+void msgqueue_free(MsgQueue_t *msgq)
+{
+}
+
+/*
+ * Function: int msgqueue_msglength(MsgQueue_t *msgq)
+ * Purpose : calculate the total length of all messages on the message queue
+ * Params  : msgq - queue to examine
+ * Returns : number of bytes of messages in queue
+ */
+int msgqueue_msglength(MsgQueue_t *msgq)
+{
+	struct msgqueue_entry *mq = msgq->qe;
+	int length = 0;
+
+	for (mq = msgq->qe; mq; mq = mq->next)
+		length += mq->msg.length;
+
+	return length;
+}
+
+/*
+ * Function: struct message *msgqueue_getmsg(MsgQueue_t *msgq, int msgno)
+ * Purpose : return a message
+ * Params  : msgq   - queue to obtain message from
+ *	   : msgno  - message number
+ * Returns : pointer to message string, or NULL
+ */
+struct message *msgqueue_getmsg(MsgQueue_t *msgq, int msgno)
+{
+	struct msgqueue_entry *mq;
+
+	for (mq = msgq->qe; mq && msgno; mq = mq->next, msgno--);
+
+	return mq ? &mq->msg : NULL;
+}
+
+/*
+ * Function: int msgqueue_addmsg(MsgQueue_t *msgq, int length, ...)
+ * Purpose : add a message onto a message queue
+ * Params  : msgq   - queue to add message on
+ *	     length - length of message
+ *	     ...    - message bytes
+ * Returns : != 0 if successful
+ */
+int msgqueue_addmsg(MsgQueue_t *msgq, int length, ...)
+{
+	struct msgqueue_entry *mq = mqe_alloc(msgq);
+	va_list ap;
+
+	if (mq) {
+		struct msgqueue_entry **mqp;
+		int i;
+
+		va_start(ap, length);
+		for (i = 0; i < length; i++)
+			mq->msg.msg[i] = va_arg(ap, unsigned int);
+		va_end(ap);
+
+		mq->msg.length = length;
+		mq->msg.fifo = 0;
+		mq->next = NULL;
+
+		mqp = &msgq->qe;
+		while (*mqp)
+			mqp = &(*mqp)->next;
+
+		*mqp = mq;
+	}
+
+	return mq != NULL;
+}
+
+/*
+ * Function: void msgqueue_flush(MsgQueue_t *msgq)
+ * Purpose : flush all messages from message queue
+ * Params  : msgq - queue to flush
+ */
+void msgqueue_flush(MsgQueue_t *msgq)
+{
+	struct msgqueue_entry *mq, *mqnext;
+
+	for (mq = msgq->qe; mq; mq = mqnext) {
+		mqnext = mq->next;
+		mqe_free(msgq, mq);
+	}
+	msgq->qe = NULL;
+}
+
+EXPORT_SYMBOL(msgqueue_initialise);
+EXPORT_SYMBOL(msgqueue_free);
+EXPORT_SYMBOL(msgqueue_msglength);
+EXPORT_SYMBOL(msgqueue_getmsg);
+EXPORT_SYMBOL(msgqueue_addmsg);
+EXPORT_SYMBOL(msgqueue_flush);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("SCSI message queue handling");
+MODULE_LICENSE("GPL");
diff --git a/drivers/scsi/arm/msgqueue.h b/drivers/scsi/arm/msgqueue.h
new file mode 100644
index 000000000..4bcc400f5
--- /dev/null
+++ b/drivers/scsi/arm/msgqueue.h
@@ -0,0 +1,79 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ *  linux/drivers/acorn/scsi/msgqueue.h
+ *
+ *  Copyright (C) 1997 Russell King
+ *
+ *  message queue handling
+ */
+#ifndef MSGQUEUE_H
+#define MSGQUEUE_H
+
+struct message {
+    char msg[8];
+    int length;
+    int fifo;
+};
+
+struct msgqueue_entry {
+    struct message msg;
+    struct msgqueue_entry *next;
+};
+
+#define NR_MESSAGES 4
+
+typedef struct {
+    struct msgqueue_entry *qe;
+    struct msgqueue_entry *free;
+    struct msgqueue_entry entries[NR_MESSAGES];
+} MsgQueue_t;
+
+/*
+ * Function: void msgqueue_initialise(MsgQueue_t *msgq)
+ * Purpose : initialise a message queue
+ * Params  : msgq - queue to initialise
+ */
+extern void msgqueue_initialise(MsgQueue_t *msgq);
+
+/*
+ * Function: void msgqueue_free(MsgQueue_t *msgq)
+ * Purpose : free a queue
+ * Params  : msgq - queue to free
+ */
+extern void msgqueue_free(MsgQueue_t *msgq);
+
+/*
+ * Function: int msgqueue_msglength(MsgQueue_t *msgq)
+ * Purpose : calculate the total length of all messages on the message queue
+ * Params  : msgq - queue to examine
+ * Returns : number of bytes of messages in queue
+ */
+extern int msgqueue_msglength(MsgQueue_t *msgq);
+
+/*
+ * Function: struct message *msgqueue_getmsg(MsgQueue_t *msgq, int msgno)
+ * Purpose : return a message & its length
+ * Params  : msgq   - queue to obtain message from
+ *         : msgno  - message number
+ * Returns : pointer to message string, or NULL
+ */
+extern struct message *msgqueue_getmsg(MsgQueue_t *msgq, int msgno);
+
+/*
+ * Function: int msgqueue_addmsg(MsgQueue_t *msgq, int length, ...)
+ * Purpose : add a message onto a message queue
+ * Params  : msgq   - queue to add message on
+ *	     length - length of message
+ *	     ...    - message bytes
+ * Returns : != 0 if successful
+ */
+extern int msgqueue_addmsg(MsgQueue_t *msgq, int length, ...);
+
+/*
+ * Function: void msgqueue_flush(MsgQueue_t *msgq)
+ * Purpose : flush all messages from message queue
+ * Params  : msgq - queue to flush
+ */
+extern void msgqueue_flush(MsgQueue_t *msgq);
+
+#endif
diff --git a/drivers/scsi/arm/oak.c b/drivers/scsi/arm/oak.c
new file mode 100644
index 000000000..f18a0620c
--- /dev/null
+++ b/drivers/scsi/arm/oak.c
@@ -0,0 +1,213 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Oak Generic NCR5380 driver
+ *
+ * Copyright 1995-2002, Russell King
+ */
+
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/blkdev.h>
+#include <linux/init.h>
+
+#include <asm/ecard.h>
+#include <asm/io.h>
+
+#include <scsi/scsi_host.h>
+
+#define priv(host)			((struct NCR5380_hostdata *)(host)->hostdata)
+
+#define NCR5380_read(reg)           readb(hostdata->io + ((reg) << 2))
+#define NCR5380_write(reg, value)   writeb(value, hostdata->io + ((reg) << 2))
+
+#define NCR5380_dma_xfer_len		NCR5380_dma_xfer_none
+#define NCR5380_dma_recv_setup		oakscsi_pread
+#define NCR5380_dma_send_setup		oakscsi_pwrite
+#define NCR5380_dma_residual		NCR5380_dma_residual_none
+
+#define NCR5380_queue_command		oakscsi_queue_command
+#define NCR5380_info			oakscsi_info
+
+#define NCR5380_implementation_fields	/* none */
+
+#include "../NCR5380.h"
+
+#undef START_DMA_INITIATOR_RECEIVE_REG
+#define START_DMA_INITIATOR_RECEIVE_REG	(128 + 7)
+
+#define STAT	((128 + 16) << 2)
+#define DATA	((128 + 8) << 2)
+
+static inline int oakscsi_pwrite(struct NCR5380_hostdata *hostdata,
+                                 unsigned char *addr, int len)
+{
+  u8 __iomem *base = hostdata->io;
+
+printk("writing %p len %d\n",addr, len);
+
+  while(1)
+  {
+    int status;
+    while (((status = readw(base + STAT)) & 0x100)==0);
+  }
+  return 0;
+}
+
+static inline int oakscsi_pread(struct NCR5380_hostdata *hostdata,
+                                unsigned char *addr, int len)
+{
+  u8 __iomem *base = hostdata->io;
+
+printk("reading %p len %d\n", addr, len);
+  while(len > 0)
+  {
+    unsigned int status, timeout;
+    unsigned long b;
+    
+    timeout = 0x01FFFFFF;
+    
+    while (((status = readw(base + STAT)) & 0x100)==0)
+    {
+      timeout--;
+      if(status & 0x200 || !timeout)
+      {
+        printk("status = %08X\n", status);
+        return -1;
+      }
+    }
+
+    if(len >= 128)
+    {
+      readsw(base + DATA, addr, 128);
+      addr += 128;
+      len -= 128;
+    }
+    else
+    {
+      b = (unsigned long) readw(base + DATA);
+      *addr ++ = b;
+      len -= 1;
+      if(len)
+        *addr ++ = b>>8;
+      len -= 1;
+    }
+  }
+  return 0;
+}
+
+#undef STAT
+#undef DATA
+
+#include "../NCR5380.c"
+
+static struct scsi_host_template oakscsi_template = {
+	.module			= THIS_MODULE,
+	.name			= "Oak 16-bit SCSI",
+	.info			= oakscsi_info,
+	.queuecommand		= oakscsi_queue_command,
+	.eh_abort_handler	= NCR5380_abort,
+	.eh_host_reset_handler	= NCR5380_host_reset,
+	.can_queue		= 16,
+	.this_id		= 7,
+	.sg_tablesize		= SG_ALL,
+	.cmd_per_lun		= 2,
+	.dma_boundary		= PAGE_SIZE - 1,
+	.proc_name		= "oakscsi",
+	.cmd_size		= sizeof(struct NCR5380_cmd),
+	.max_sectors		= 128,
+};
+
+static int oakscsi_probe(struct expansion_card *ec, const struct ecard_id *id)
+{
+	struct Scsi_Host *host;
+	int ret;
+
+	ret = ecard_request_resources(ec);
+	if (ret)
+		goto out;
+
+	host = scsi_host_alloc(&oakscsi_template, sizeof(struct NCR5380_hostdata));
+	if (!host) {
+		ret = -ENOMEM;
+		goto release;
+	}
+
+	priv(host)->io = ioremap(ecard_resource_start(ec, ECARD_RES_MEMC),
+	                         ecard_resource_len(ec, ECARD_RES_MEMC));
+	if (!priv(host)->io) {
+		ret = -ENOMEM;
+		goto unreg;
+	}
+
+	host->irq = NO_IRQ;
+
+	ret = NCR5380_init(host, FLAG_DMA_FIXUP | FLAG_LATE_DMA_SETUP);
+	if (ret)
+		goto out_unmap;
+
+	NCR5380_maybe_reset_bus(host);
+
+	ret = scsi_add_host(host, &ec->dev);
+	if (ret)
+		goto out_exit;
+
+	scsi_scan_host(host);
+	goto out;
+
+ out_exit:
+	NCR5380_exit(host);
+ out_unmap:
+	iounmap(priv(host)->io);
+ unreg:
+	scsi_host_put(host);
+ release:
+	ecard_release_resources(ec);
+ out:
+	return ret;
+}
+
+static void oakscsi_remove(struct expansion_card *ec)
+{
+	struct Scsi_Host *host = ecard_get_drvdata(ec);
+	void __iomem *base = priv(host)->io;
+
+	ecard_set_drvdata(ec, NULL);
+	scsi_remove_host(host);
+
+	NCR5380_exit(host);
+	scsi_host_put(host);
+	iounmap(base);
+	ecard_release_resources(ec);
+}
+
+static const struct ecard_id oakscsi_cids[] = {
+	{ MANU_OAK, PROD_OAK_SCSI },
+	{ 0xffff, 0xffff }
+};
+
+static struct ecard_driver oakscsi_driver = {
+	.probe		= oakscsi_probe,
+	.remove		= oakscsi_remove,
+	.id_table	= oakscsi_cids,
+	.drv = {
+		.name		= "oakscsi",
+	},
+};
+
+static int __init oakscsi_init(void)
+{
+	return ecard_register_driver(&oakscsi_driver);
+}
+
+static void __exit oakscsi_exit(void)
+{
+	ecard_remove_driver(&oakscsi_driver);
+}
+
+module_init(oakscsi_init);
+module_exit(oakscsi_exit);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("Oak SCSI driver");
+MODULE_LICENSE("GPL");
+
diff --git a/drivers/scsi/arm/powertec.c b/drivers/scsi/arm/powertec.c
new file mode 100644
index 000000000..7586d2a03
--- /dev/null
+++ b/drivers/scsi/arm/powertec.c
@@ -0,0 +1,452 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  linux/drivers/acorn/scsi/powertec.c
+ *
+ *  Copyright (C) 1997-2005 Russell King
+ */
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/ioport.h>
+#include <linux/proc_fs.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/dma-mapping.h>
+#include <linux/pgtable.h>
+
+#include <asm/dma.h>
+#include <asm/ecard.h>
+#include <asm/io.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi_tcq.h>
+#include "fas216.h"
+#include "arm_scsi.h"
+
+#include <scsi/scsicam.h>
+
+#define POWERTEC_FAS216_OFFSET	0x3000
+#define POWERTEC_FAS216_SHIFT	6
+
+#define POWERTEC_INTR_STATUS	0x2000
+#define POWERTEC_INTR_BIT	0x80
+
+#define POWERTEC_RESET_CONTROL	0x1018
+#define POWERTEC_RESET_BIT	1
+
+#define POWERTEC_TERM_CONTROL	0x2018
+#define POWERTEC_TERM_ENABLE	1
+
+#define POWERTEC_INTR_CONTROL	0x101c
+#define POWERTEC_INTR_ENABLE	1
+#define POWERTEC_INTR_DISABLE	0
+
+#define VERSION	"1.10 (19/01/2003 2.5.59)"
+
+/*
+ * Use term=0,1,0,0,0 to turn terminators on/off.
+ * One entry per slot.
+ */
+static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
+
+#define NR_SG	256
+
+struct powertec_info {
+	FAS216_Info		info;
+	struct expansion_card	*ec;
+	void __iomem		*base;
+	unsigned int		term_ctl;
+	struct scatterlist	sg[NR_SG];
+};
+
+/* Prototype: void powertecscsi_irqenable(ec, irqnr)
+ * Purpose  : Enable interrupts on Powertec SCSI card
+ * Params   : ec    - expansion card structure
+ *          : irqnr - interrupt number
+ */
+static void
+powertecscsi_irqenable(struct expansion_card *ec, int irqnr)
+{
+	struct powertec_info *info = ec->irq_data;
+	writeb(POWERTEC_INTR_ENABLE, info->base + POWERTEC_INTR_CONTROL);
+}
+
+/* Prototype: void powertecscsi_irqdisable(ec, irqnr)
+ * Purpose  : Disable interrupts on Powertec SCSI card
+ * Params   : ec    - expansion card structure
+ *          : irqnr - interrupt number
+ */
+static void
+powertecscsi_irqdisable(struct expansion_card *ec, int irqnr)
+{
+	struct powertec_info *info = ec->irq_data;
+	writeb(POWERTEC_INTR_DISABLE, info->base + POWERTEC_INTR_CONTROL);
+}
+
+static const expansioncard_ops_t powertecscsi_ops = {
+	.irqenable	= powertecscsi_irqenable,
+	.irqdisable	= powertecscsi_irqdisable,
+};
+
+/* Prototype: void powertecscsi_terminator_ctl(host, on_off)
+ * Purpose  : Turn the Powertec SCSI terminators on or off
+ * Params   : host   - card to turn on/off
+ *          : on_off - !0 to turn on, 0 to turn off
+ */
+static void
+powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
+{
+	struct powertec_info *info = (struct powertec_info *)host->hostdata;
+
+	info->term_ctl = on_off ? POWERTEC_TERM_ENABLE : 0;
+	writeb(info->term_ctl, info->base + POWERTEC_TERM_CONTROL);
+}
+
+/* Prototype: void powertecscsi_intr(irq, *dev_id, *regs)
+ * Purpose  : handle interrupts from Powertec SCSI card
+ * Params   : irq    - interrupt number
+ *	      dev_id - user-defined (Scsi_Host structure)
+ */
+static irqreturn_t powertecscsi_intr(int irq, void *dev_id)
+{
+	struct powertec_info *info = dev_id;
+
+	return fas216_intr(&info->info);
+}
+
+/* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type)
+ * Purpose  : initialises DMA/PIO
+ * Params   : host      - host
+ *	      SCpnt     - command
+ *	      direction - DMA on to/off of card
+ *	      min_type  - minimum DMA support that we must have for this transfer
+ * Returns  : type of transfer to be performed
+ */
+static fasdmatype_t
+powertecscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
+		       fasdmadir_t direction, fasdmatype_t min_type)
+{
+	struct powertec_info *info = (struct powertec_info *)host->hostdata;
+	struct device *dev = scsi_get_device(host);
+	int dmach = info->info.scsi.dma;
+
+	if (info->info.ifcfg.capabilities & FASCAP_DMA &&
+	    min_type == fasdma_real_all) {
+		int bufs, map_dir, dma_dir;
+
+		bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
+
+		if (direction == DMA_OUT) {
+			map_dir = DMA_TO_DEVICE;
+			dma_dir = DMA_MODE_WRITE;
+		} else {
+			map_dir = DMA_FROM_DEVICE;
+			dma_dir = DMA_MODE_READ;
+		}
+
+		dma_map_sg(dev, info->sg, bufs, map_dir);
+
+		disable_dma(dmach);
+		set_dma_sg(dmach, info->sg, bufs);
+		set_dma_mode(dmach, dma_dir);
+		enable_dma(dmach);
+		return fasdma_real_all;
+	}
+
+	/*
+	 * If we're not doing DMA,
+	 *  we'll do slow PIO
+	 */
+	return fasdma_pio;
+}
+
+/* Prototype: int powertecscsi_dma_stop(host, SCpnt)
+ * Purpose  : stops DMA/PIO
+ * Params   : host  - host
+ *	      SCpnt - command
+ */
+static void
+powertecscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
+{
+	struct powertec_info *info = (struct powertec_info *)host->hostdata;
+	if (info->info.scsi.dma != NO_DMA)
+		disable_dma(info->info.scsi.dma);
+}
+
+/* Prototype: const char *powertecscsi_info(struct Scsi_Host * host)
+ * Purpose  : returns a descriptive string about this interface,
+ * Params   : host - driver host structure to return info for.
+ * Returns  : pointer to a static buffer containing null terminated string.
+ */
+const char *powertecscsi_info(struct Scsi_Host *host)
+{
+	struct powertec_info *info = (struct powertec_info *)host->hostdata;
+	static char string[150];
+
+	sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
+		host->hostt->name, info->info.scsi.type, info->ec->slot_no,
+		VERSION, info->term_ctl ? "n" : "ff");
+
+	return string;
+}
+
+/* Prototype: int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
+ * Purpose  : Set a driver specific function
+ * Params   : host   - host to setup
+ *          : buffer - buffer containing string describing operation
+ *          : length - length of string
+ * Returns  : -EINVAL, or 0
+ */
+static int
+powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
+{
+	int ret = length;
+
+	if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) {
+		buffer += 12;
+		length -= 12;
+
+		if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
+			if (buffer[5] == '1')
+				powertecscsi_terminator_ctl(host, 1);
+			else if (buffer[5] == '0')
+				powertecscsi_terminator_ctl(host, 0);
+			else
+				ret = -EINVAL;
+		} else
+			ret = -EINVAL;
+	} else
+		ret = -EINVAL;
+
+	return ret;
+}
+
+/* Prototype: int powertecscsi_proc_info(char *buffer, char **start, off_t offset,
+ *					int length, int host_no, int inout)
+ * Purpose  : Return information about the driver to a user process accessing
+ *	      the /proc filesystem.
+ * Params   : buffer  - a buffer to write information to
+ *	      start   - a pointer into this buffer set by this routine to the start
+ *		        of the required information.
+ *	      offset  - offset into information that we have read up to.
+ *	      length  - length of buffer
+ *	      inout   - 0 for reading, 1 for writing.
+ * Returns  : length of data written to buffer.
+ */
+static int powertecscsi_show_info(struct seq_file *m, struct Scsi_Host *host)
+{
+	struct powertec_info *info;
+
+	info = (struct powertec_info *)host->hostdata;
+
+	seq_printf(m, "PowerTec SCSI driver v%s\n", VERSION);
+	fas216_print_host(&info->info, m);
+	seq_printf(m, "Term    : o%s\n",
+			info->term_ctl ? "n" : "ff");
+
+	fas216_print_stats(&info->info, m);
+	fas216_print_devices(&info->info, m);
+	return 0;
+}
+
+static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct expansion_card *ec = ECARD_DEV(dev);
+	struct Scsi_Host *host = ecard_get_drvdata(ec);
+	struct powertec_info *info = (struct powertec_info *)host->hostdata;
+
+	return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0);
+}
+
+static ssize_t
+powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
+{
+	struct expansion_card *ec = ECARD_DEV(dev);
+	struct Scsi_Host *host = ecard_get_drvdata(ec);
+
+	if (len > 1)
+		powertecscsi_terminator_ctl(host, buf[0] != '0');
+
+	return len;
+}
+
+static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
+		   powertecscsi_show_term, powertecscsi_store_term);
+
+static struct scsi_host_template powertecscsi_template = {
+	.module				= THIS_MODULE,
+	.show_info			= powertecscsi_show_info,
+	.write_info			= powertecscsi_set_proc_info,
+	.name				= "PowerTec SCSI",
+	.info				= powertecscsi_info,
+	.queuecommand			= fas216_queue_command,
+	.eh_host_reset_handler		= fas216_eh_host_reset,
+	.eh_bus_reset_handler		= fas216_eh_bus_reset,
+	.eh_device_reset_handler	= fas216_eh_device_reset,
+	.eh_abort_handler		= fas216_eh_abort,
+	.cmd_size			= sizeof(struct fas216_cmd_priv),
+	.can_queue			= 8,
+	.this_id			= 7,
+	.sg_tablesize			= SG_MAX_SEGMENTS,
+	.dma_boundary			= IOMD_DMA_BOUNDARY,
+	.cmd_per_lun			= 2,
+	.proc_name			= "powertec",
+};
+
+static int powertecscsi_probe(struct expansion_card *ec,
+			      const struct ecard_id *id)
+{
+	struct Scsi_Host *host;
+	struct powertec_info *info;
+	void __iomem *base;
+	int ret;
+
+	ret = ecard_request_resources(ec);
+	if (ret)
+		goto out;
+
+	base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
+	if (!base) {
+		ret = -ENOMEM;
+		goto out_region;
+	}
+
+	host = scsi_host_alloc(&powertecscsi_template,
+			       sizeof (struct powertec_info));
+	if (!host) {
+		ret = -ENOMEM;
+		goto out_region;
+	}
+
+	ecard_set_drvdata(ec, host);
+
+	info = (struct powertec_info *)host->hostdata;
+	info->base = base;
+	powertecscsi_terminator_ctl(host, term[ec->slot_no]);
+
+	info->ec = ec;
+	info->info.scsi.io_base		= base + POWERTEC_FAS216_OFFSET;
+	info->info.scsi.io_shift	= POWERTEC_FAS216_SHIFT;
+	info->info.scsi.irq		= ec->irq;
+	info->info.scsi.dma		= ec->dma;
+	info->info.ifcfg.clockrate	= 40; /* MHz */
+	info->info.ifcfg.select_timeout	= 255;
+	info->info.ifcfg.asyncperiod	= 200; /* ns */
+	info->info.ifcfg.sync_max_depth	= 7;
+	info->info.ifcfg.cntl3		= CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
+	info->info.ifcfg.disconnect_ok	= 1;
+	info->info.ifcfg.wide_max_size	= 0;
+	info->info.ifcfg.capabilities	= 0;
+	info->info.dma.setup		= powertecscsi_dma_setup;
+	info->info.dma.pseudo		= NULL;
+	info->info.dma.stop		= powertecscsi_dma_stop;
+
+	ec->irqaddr	= base + POWERTEC_INTR_STATUS;
+	ec->irqmask	= POWERTEC_INTR_BIT;
+
+	ecard_setirq(ec, &powertecscsi_ops, info);
+
+	device_create_file(&ec->dev, &dev_attr_bus_term);
+
+	ret = fas216_init(host);
+	if (ret)
+		goto out_free;
+
+	ret = request_irq(ec->irq, powertecscsi_intr,
+			  0, "powertec", info);
+	if (ret) {
+		printk("scsi%d: IRQ%d not free: %d\n",
+		       host->host_no, ec->irq, ret);
+		goto out_release;
+	}
+
+	if (info->info.scsi.dma != NO_DMA) {
+		if (request_dma(info->info.scsi.dma, "powertec")) {
+			printk("scsi%d: DMA%d not free, using PIO\n",
+			       host->host_no, info->info.scsi.dma);
+			info->info.scsi.dma = NO_DMA;
+		} else {
+			set_dma_speed(info->info.scsi.dma, 180);
+			info->info.ifcfg.capabilities |= FASCAP_DMA;
+		}
+	}
+
+	ret = fas216_add(host, &ec->dev);
+	if (ret == 0)
+		goto out;
+
+	if (info->info.scsi.dma != NO_DMA)
+		free_dma(info->info.scsi.dma);
+	free_irq(ec->irq, info);
+
+ out_release:
+	fas216_release(host);
+
+ out_free:
+	device_remove_file(&ec->dev, &dev_attr_bus_term);
+	scsi_host_put(host);
+
+ out_region:
+	ecard_release_resources(ec);
+
+ out:
+	return ret;
+}
+
+static void powertecscsi_remove(struct expansion_card *ec)
+{
+	struct Scsi_Host *host = ecard_get_drvdata(ec);
+	struct powertec_info *info = (struct powertec_info *)host->hostdata;
+
+	ecard_set_drvdata(ec, NULL);
+	fas216_remove(host);
+
+	device_remove_file(&ec->dev, &dev_attr_bus_term);
+
+	if (info->info.scsi.dma != NO_DMA)
+		free_dma(info->info.scsi.dma);
+	free_irq(ec->irq, info);
+
+	fas216_release(host);
+	scsi_host_put(host);
+	ecard_release_resources(ec);
+}
+
+static const struct ecard_id powertecscsi_cids[] = {
+	{ MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI },
+	{ 0xffff, 0xffff },
+};
+
+static struct ecard_driver powertecscsi_driver = {
+	.probe		= powertecscsi_probe,
+	.remove		= powertecscsi_remove,
+	.id_table	= powertecscsi_cids,
+	.drv = {
+		.name		= "powertecscsi",
+	},
+};
+
+static int __init powertecscsi_init(void)
+{
+	return ecard_register_driver(&powertecscsi_driver);
+}
+
+static void __exit powertecscsi_exit(void)
+{
+	ecard_remove_driver(&powertecscsi_driver);
+}
+
+module_init(powertecscsi_init);
+module_exit(powertecscsi_exit);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("Powertec SCSI driver");
+module_param_array(term, int, NULL, 0);
+MODULE_PARM_DESC(term, "SCSI bus termination");
+MODULE_LICENSE("GPL");
diff --git a/drivers/scsi/arm/queue.c b/drivers/scsi/arm/queue.c
new file mode 100644
index 000000000..978df23ce
--- /dev/null
+++ b/drivers/scsi/arm/queue.c
@@ -0,0 +1,319 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  linux/drivers/acorn/scsi/queue.c: queue handling primitives
+ *
+ *  Copyright (C) 1997-2000 Russell King
+ *
+ *  Changelog:
+ *   15-Sep-1997 RMK	Created.
+ *   11-Oct-1997 RMK	Corrected problem with queue_remove_exclude
+ *			not updating internal linked list properly
+ *			(was causing commands to go missing).
+ *   30-Aug-2000 RMK	Use Linux list handling and spinlocks
+ */
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/init.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_tcq.h>
+
+#define DEBUG
+
+typedef struct queue_entry {
+	struct list_head   list;
+	struct scsi_cmnd   *SCpnt;
+#ifdef DEBUG
+	unsigned long	   magic;
+#endif
+} QE_t;
+
+#ifdef DEBUG
+#define QUEUE_MAGIC_FREE	0xf7e1c9a3
+#define QUEUE_MAGIC_USED	0xf7e1cc33
+
+#define SET_MAGIC(q,m)	((q)->magic = (m))
+#define BAD_MAGIC(q,m)	((q)->magic != (m))
+#else
+#define SET_MAGIC(q,m)	do { } while (0)
+#define BAD_MAGIC(q,m)	(0)
+#endif
+
+#include "queue.h"
+
+#define NR_QE	32
+
+/*
+ * Function: void queue_initialise (Queue_t *queue)
+ * Purpose : initialise a queue
+ * Params  : queue - queue to initialise
+ */
+int queue_initialise (Queue_t *queue)
+{
+	unsigned int nqueues = NR_QE;
+	QE_t *q;
+
+	spin_lock_init(&queue->queue_lock);
+	INIT_LIST_HEAD(&queue->head);
+	INIT_LIST_HEAD(&queue->free);
+
+	/*
+	 * If life was easier, then SCpnt would have a
+	 * host-available list head, and we wouldn't
+	 * need to keep free lists or allocate this
+	 * memory.
+	 */
+	queue->alloc = q = kmalloc_array(nqueues, sizeof(QE_t), GFP_KERNEL);
+	if (q) {
+		for (; nqueues; q++, nqueues--) {
+			SET_MAGIC(q, QUEUE_MAGIC_FREE);
+			q->SCpnt = NULL;
+			list_add(&q->list, &queue->free);
+		}
+	}
+
+	return queue->alloc != NULL;
+}
+
+/*
+ * Function: void queue_free (Queue_t *queue)
+ * Purpose : free a queue
+ * Params  : queue - queue to free
+ */
+void queue_free (Queue_t *queue)
+{
+	if (!list_empty(&queue->head))
+		printk(KERN_WARNING "freeing non-empty queue %p\n", queue);
+	kfree(queue->alloc);
+}
+     
+
+/*
+ * Function: int __queue_add(Queue_t *queue, struct scsi_cmnd *SCpnt, int head)
+ * Purpose : Add a new command onto a queue, adding REQUEST_SENSE to head.
+ * Params  : queue - destination queue
+ *	     SCpnt - command to add
+ *	     head  - add command to head of queue
+ * Returns : 0 on error, !0 on success
+ */
+int __queue_add(Queue_t *queue, struct scsi_cmnd *SCpnt, int head)
+{
+	unsigned long flags;
+	struct list_head *l;
+	QE_t *q;
+	int ret = 0;
+
+	spin_lock_irqsave(&queue->queue_lock, flags);
+	if (list_empty(&queue->free))
+		goto empty;
+
+	l = queue->free.next;
+	list_del(l);
+
+	q = list_entry(l, QE_t, list);
+	BUG_ON(BAD_MAGIC(q, QUEUE_MAGIC_FREE));
+
+	SET_MAGIC(q, QUEUE_MAGIC_USED);
+	q->SCpnt = SCpnt;
+
+	if (head)
+		list_add(l, &queue->head);
+	else
+		list_add_tail(l, &queue->head);
+
+	ret = 1;
+empty:
+	spin_unlock_irqrestore(&queue->queue_lock, flags);
+	return ret;
+}
+
+static struct scsi_cmnd *__queue_remove(Queue_t *queue, struct list_head *ent)
+{
+	QE_t *q;
+
+	/*
+	 * Move the entry from the "used" list onto the "free" list
+	 */
+	list_del(ent);
+	q = list_entry(ent, QE_t, list);
+	BUG_ON(BAD_MAGIC(q, QUEUE_MAGIC_USED));
+
+	SET_MAGIC(q, QUEUE_MAGIC_FREE);
+	list_add(ent, &queue->free);
+
+	return q->SCpnt;
+}
+
+/*
+ * Function: struct scsi_cmnd *queue_remove_exclude (queue, exclude)
+ * Purpose : remove a SCSI command from a queue
+ * Params  : queue   - queue to remove command from
+ *	     exclude - bit array of target&lun which is busy
+ * Returns : struct scsi_cmnd if successful (and a reference), or NULL if no command available
+ */
+struct scsi_cmnd *queue_remove_exclude(Queue_t *queue, unsigned long *exclude)
+{
+	unsigned long flags;
+	struct list_head *l;
+	struct scsi_cmnd *SCpnt = NULL;
+
+	spin_lock_irqsave(&queue->queue_lock, flags);
+	list_for_each(l, &queue->head) {
+		QE_t *q = list_entry(l, QE_t, list);
+		if (!test_bit(q->SCpnt->device->id * 8 +
+			      (u8)(q->SCpnt->device->lun & 0x7), exclude)) {
+			SCpnt = __queue_remove(queue, l);
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&queue->queue_lock, flags);
+
+	return SCpnt;
+}
+
+/*
+ * Function: struct scsi_cmnd *queue_remove (queue)
+ * Purpose : removes first SCSI command from a queue
+ * Params  : queue   - queue to remove command from
+ * Returns : struct scsi_cmnd if successful (and a reference), or NULL if no command available
+ */
+struct scsi_cmnd *queue_remove(Queue_t *queue)
+{
+	unsigned long flags;
+	struct scsi_cmnd *SCpnt = NULL;
+
+	spin_lock_irqsave(&queue->queue_lock, flags);
+	if (!list_empty(&queue->head))
+		SCpnt = __queue_remove(queue, queue->head.next);
+	spin_unlock_irqrestore(&queue->queue_lock, flags);
+
+	return SCpnt;
+}
+
+/*
+ * Function: struct scsi_cmnd *queue_remove_tgtluntag (queue, target, lun, tag)
+ * Purpose : remove a SCSI command from the queue for a specified target/lun/tag
+ * Params  : queue  - queue to remove command from
+ *	     target - target that we want
+ *	     lun    - lun on device
+ *	     tag    - tag on device
+ * Returns : struct scsi_cmnd if successful, or NULL if no command satisfies requirements
+ */
+struct scsi_cmnd *queue_remove_tgtluntag(Queue_t *queue, int target, int lun,
+					 int tag)
+{
+	unsigned long flags;
+	struct list_head *l;
+	struct scsi_cmnd *SCpnt = NULL;
+
+	spin_lock_irqsave(&queue->queue_lock, flags);
+	list_for_each(l, &queue->head) {
+		QE_t *q = list_entry(l, QE_t, list);
+		if (q->SCpnt->device->id == target && q->SCpnt->device->lun == lun &&
+		    scsi_cmd_to_rq(q->SCpnt)->tag == tag) {
+			SCpnt = __queue_remove(queue, l);
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&queue->queue_lock, flags);
+
+	return SCpnt;
+}
+
+/*
+ * Function: queue_remove_all_target(queue, target)
+ * Purpose : remove all SCSI commands from the queue for a specified target
+ * Params  : queue  - queue to remove command from
+ *           target - target device id
+ * Returns : nothing
+ */
+void queue_remove_all_target(Queue_t *queue, int target)
+{
+	unsigned long flags;
+	struct list_head *l;
+
+	spin_lock_irqsave(&queue->queue_lock, flags);
+	list_for_each(l, &queue->head) {
+		QE_t *q = list_entry(l, QE_t, list);
+		if (q->SCpnt->device->id == target)
+			__queue_remove(queue, l);
+	}
+	spin_unlock_irqrestore(&queue->queue_lock, flags);
+}
+
+/*
+ * Function: int queue_probetgtlun (queue, target, lun)
+ * Purpose : check to see if we have a command in the queue for the specified
+ *	     target/lun.
+ * Params  : queue  - queue to look in
+ *	     target - target we want to probe
+ *	     lun    - lun on target
+ * Returns : 0 if not found, != 0 if found
+ */
+int queue_probetgtlun (Queue_t *queue, int target, int lun)
+{
+	unsigned long flags;
+	struct list_head *l;
+	int found = 0;
+
+	spin_lock_irqsave(&queue->queue_lock, flags);
+	list_for_each(l, &queue->head) {
+		QE_t *q = list_entry(l, QE_t, list);
+		if (q->SCpnt->device->id == target && q->SCpnt->device->lun == lun) {
+			found = 1;
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&queue->queue_lock, flags);
+
+	return found;
+}
+
+/*
+ * Function: int queue_remove_cmd(Queue_t *queue, struct scsi_cmnd *SCpnt)
+ * Purpose : remove a specific command from the queues
+ * Params  : queue - queue to look in
+ *	     SCpnt - command to find
+ * Returns : 0 if not found
+ */
+int queue_remove_cmd(Queue_t *queue, struct scsi_cmnd *SCpnt)
+{
+	unsigned long flags;
+	struct list_head *l;
+	int found = 0;
+
+	spin_lock_irqsave(&queue->queue_lock, flags);
+	list_for_each(l, &queue->head) {
+		QE_t *q = list_entry(l, QE_t, list);
+		if (q->SCpnt == SCpnt) {
+			__queue_remove(queue, l);
+			found = 1;
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&queue->queue_lock, flags);
+
+	return found;
+}
+
+EXPORT_SYMBOL(queue_initialise);
+EXPORT_SYMBOL(queue_free);
+EXPORT_SYMBOL(__queue_add);
+EXPORT_SYMBOL(queue_remove);
+EXPORT_SYMBOL(queue_remove_exclude);
+EXPORT_SYMBOL(queue_remove_tgtluntag);
+EXPORT_SYMBOL(queue_remove_cmd);
+EXPORT_SYMBOL(queue_remove_all_target);
+EXPORT_SYMBOL(queue_probetgtlun);
+
+MODULE_AUTHOR("Russell King");
+MODULE_DESCRIPTION("SCSI command queueing");
+MODULE_LICENSE("GPL");
diff --git a/drivers/scsi/arm/queue.h b/drivers/scsi/arm/queue.h
new file mode 100644
index 000000000..cb51379dc
--- /dev/null
+++ b/drivers/scsi/arm/queue.h
@@ -0,0 +1,104 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ *  linux/drivers/acorn/scsi/queue.h: queue handling
+ *
+ *  Copyright (C) 1997 Russell King
+ */
+#ifndef QUEUE_H
+#define QUEUE_H
+
+typedef struct {
+	struct list_head head;
+	struct list_head free;
+	spinlock_t queue_lock;
+	void *alloc;			/* start of allocated mem */
+} Queue_t;
+
+/*
+ * Function: void queue_initialise (Queue_t *queue)
+ * Purpose : initialise a queue
+ * Params  : queue - queue to initialise
+ */
+extern int queue_initialise (Queue_t *queue);
+
+/*
+ * Function: void queue_free (Queue_t *queue)
+ * Purpose : free a queue
+ * Params  : queue - queue to free
+ */
+extern void queue_free (Queue_t *queue);
+
+/*
+ * Function: struct scsi_cmnd *queue_remove (queue)
+ * Purpose : removes first SCSI command from a queue
+ * Params  : queue   - queue to remove command from
+ * Returns : struct scsi_cmnd if successful (and a reference), or NULL if no command available
+ */
+extern struct scsi_cmnd *queue_remove (Queue_t *queue);
+
+/*
+ * Function: struct scsi_cmnd *queue_remove_exclude_ref (queue, exclude)
+ * Purpose : remove a SCSI command from a queue
+ * Params  : queue   - queue to remove command from
+ *	     exclude - array of busy LUNs
+ * Returns : struct scsi_cmnd if successful (and a reference), or NULL if no command available
+ */
+extern struct scsi_cmnd *queue_remove_exclude(Queue_t *queue,
+					      unsigned long *exclude);
+
+#define queue_add_cmd_ordered(queue,SCpnt) \
+	__queue_add(queue,SCpnt,(SCpnt)->cmnd[0] == REQUEST_SENSE)
+#define queue_add_cmd_tail(queue,SCpnt) \
+	__queue_add(queue,SCpnt,0)
+/*
+ * Function: int __queue_add(Queue_t *queue, struct scsi_cmnd *SCpnt, int head)
+ * Purpose : Add a new command onto a queue
+ * Params  : queue - destination queue
+ *	     SCpnt - command to add
+ *	     head  - add command to head of queue
+ * Returns : 0 on error, !0 on success
+ */
+extern int __queue_add(Queue_t *queue, struct scsi_cmnd *SCpnt, int head);
+
+/*
+ * Function: struct scsi_cmnd *queue_remove_tgtluntag (queue, target, lun, tag)
+ * Purpose : remove a SCSI command from the queue for a specified target/lun/tag
+ * Params  : queue  - queue to remove command from
+ *	     target - target that we want
+ *	     lun    - lun on device
+ *	     tag    - tag on device
+ * Returns : struct scsi_cmnd if successful, or NULL if no command satisfies requirements
+ */
+extern struct scsi_cmnd *queue_remove_tgtluntag(Queue_t *queue, int target,
+						int lun, int tag);
+
+/*
+ * Function: queue_remove_all_target(queue, target)
+ * Purpose : remove all SCSI commands from the queue for a specified target
+ * Params  : queue  - queue to remove command from
+ *           target - target device id
+ * Returns : nothing
+ */
+extern void queue_remove_all_target(Queue_t *queue, int target);
+
+/*
+ * Function: int queue_probetgtlun (queue, target, lun)
+ * Purpose : check to see if we have a command in the queue for the specified
+ *	     target/lun.
+ * Params  : queue  - queue to look in
+ *	     target - target we want to probe
+ *	     lun    - lun on target
+ * Returns : 0 if not found, != 0 if found
+ */
+extern int queue_probetgtlun (Queue_t *queue, int target, int lun);
+
+/*
+ * Function: int queue_remove_cmd (Queue_t *queue, struct scsi_cmnd *SCpnt)
+ * Purpose : remove a specific command from the queues
+ * Params  : queue - queue to look in
+ *	     SCpnt - command to find
+ * Returns : 0 if not found
+ */
+int queue_remove_cmd(Queue_t *queue, struct scsi_cmnd *SCpnt);
+
+#endif /* QUEUE_H */