Adding upstream version 4.19.249.upstream/4.19.249

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

1 files changed, 818 insertions, 0 deletions

diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c
new file mode 100644
index 000000000..fc538181f
--- /dev/null
+++ b/drivers/scsi/g_NCR5380.c
@@ -0,0 +1,818 @@
+/*
+ * Generic Generic NCR5380 driver
+ *
+ * Copyright 1993, Drew Eckhardt
+ * Visionary Computing
+ * (Unix and Linux consulting and custom programming)
+ * drew@colorado.edu
+ * +1 (303) 440-4894
+ *
+ * NCR53C400 extensions (c) 1994,1995,1996, Kevin Lentin
+ * K.Lentin@cs.monash.edu.au
+ *
+ * NCR53C400A extensions (c) 1996, Ingmar Baumgart
+ * ingmar@gonzo.schwaben.de
+ *
+ * DTC3181E extensions (c) 1997, Ronald van Cuijlenborg
+ * ronald.van.cuijlenborg@tip.nl or nutty@dds.nl
+ *
+ * Added ISAPNP support for DTC436 adapters,
+ * Thomas Sailer, sailer@ife.ee.ethz.ch
+ *
+ * See Documentation/scsi/g_NCR5380.txt for more info.
+ */
+
+#include <asm/io.h>
+#include <linux/blkdev.h>
+#include <linux/module.h>
+#include <scsi/scsi_host.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/isa.h>
+#include <linux/pnp.h>
+#include <linux/interrupt.h>
+
+/* Definitions for the core NCR5380 driver. */
+
+#define NCR5380_read(reg) \
+	ioread8(hostdata->io + hostdata->offset + (reg))
+#define NCR5380_write(reg, value) \
+	iowrite8(value, hostdata->io + hostdata->offset + (reg))
+
+#define NCR5380_implementation_fields \
+	int offset; \
+	int c400_ctl_status; \
+	int c400_blk_cnt; \
+	int c400_host_buf; \
+	int io_width; \
+	int pdma_residual; \
+	int board
+
+#define NCR5380_dma_xfer_len            generic_NCR5380_dma_xfer_len
+#define NCR5380_dma_recv_setup          generic_NCR5380_precv
+#define NCR5380_dma_send_setup          generic_NCR5380_psend
+#define NCR5380_dma_residual            generic_NCR5380_dma_residual
+
+#define NCR5380_intr                    generic_NCR5380_intr
+#define NCR5380_queue_command           generic_NCR5380_queue_command
+#define NCR5380_abort                   generic_NCR5380_abort
+#define NCR5380_host_reset              generic_NCR5380_host_reset
+#define NCR5380_info                    generic_NCR5380_info
+
+#define NCR5380_io_delay(x)             udelay(x)
+
+#include "NCR5380.h"
+
+#define DRV_MODULE_NAME "g_NCR5380"
+
+#define NCR53C400_mem_base 0x3880
+#define NCR53C400_host_buffer 0x3900
+#define NCR53C400_region_size 0x3a00
+
+#define BOARD_NCR5380 0
+#define BOARD_NCR53C400 1
+#define BOARD_NCR53C400A 2
+#define BOARD_DTC3181E 3
+#define BOARD_HP_C2502 4
+
+#define IRQ_AUTO 254
+
+#define MAX_CARDS 8
+#define DMA_MAX_SIZE 32768
+
+/* old-style parameters for compatibility */
+static int ncr_irq = -1;
+static int ncr_addr;
+static int ncr_5380;
+static int ncr_53c400;
+static int ncr_53c400a;
+static int dtc_3181e;
+static int hp_c2502;
+module_param_hw(ncr_irq, int, irq, 0);
+module_param_hw(ncr_addr, int, ioport, 0);
+module_param(ncr_5380, int, 0);
+module_param(ncr_53c400, int, 0);
+module_param(ncr_53c400a, int, 0);
+module_param(dtc_3181e, int, 0);
+module_param(hp_c2502, int, 0);
+
+static int irq[] = { -1, -1, -1, -1, -1, -1, -1, -1 };
+module_param_hw_array(irq, int, irq, NULL, 0);
+MODULE_PARM_DESC(irq, "IRQ number(s) (0=none, 254=auto [default])");
+
+static int base[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
+module_param_hw_array(base, int, ioport, NULL, 0);
+MODULE_PARM_DESC(base, "base address(es)");
+
+static int card[] = { -1, -1, -1, -1, -1, -1, -1, -1 };
+module_param_array(card, int, NULL, 0);
+MODULE_PARM_DESC(card, "card type (0=NCR5380, 1=NCR53C400, 2=NCR53C400A, 3=DTC3181E, 4=HP C2502)");
+
+MODULE_ALIAS("g_NCR5380_mmio");
+MODULE_LICENSE("GPL");
+
+static void g_NCR5380_trigger_irq(struct Scsi_Host *instance)
+{
+	struct NCR5380_hostdata *hostdata = shost_priv(instance);
+
+	/*
+	 * An interrupt is triggered whenever BSY = false, SEL = true
+	 * and a bit set in the SELECT_ENABLE_REG is asserted on the
+	 * SCSI bus.
+	 *
+	 * Note that the bus is only driven when the phase control signals
+	 * (I/O, C/D, and MSG) match those in the TCR.
+	 */
+	NCR5380_write(TARGET_COMMAND_REG,
+	              PHASE_SR_TO_TCR(NCR5380_read(STATUS_REG) & PHASE_MASK));
+	NCR5380_write(SELECT_ENABLE_REG, hostdata->id_mask);
+	NCR5380_write(OUTPUT_DATA_REG, hostdata->id_mask);
+	NCR5380_write(INITIATOR_COMMAND_REG,
+	              ICR_BASE | ICR_ASSERT_DATA | ICR_ASSERT_SEL);
+
+	msleep(1);
+
+	NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);
+	NCR5380_write(SELECT_ENABLE_REG, 0);
+	NCR5380_write(TARGET_COMMAND_REG, 0);
+}
+
+/**
+ * g_NCR5380_probe_irq - find the IRQ of a NCR5380 or equivalent
+ * @instance: SCSI host instance
+ *
+ * Autoprobe for the IRQ line used by the card by triggering an IRQ
+ * and then looking to see what interrupt actually turned up.
+ */
+
+static int g_NCR5380_probe_irq(struct Scsi_Host *instance)
+{
+	struct NCR5380_hostdata *hostdata = shost_priv(instance);
+	int irq_mask, irq;
+
+	NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+	irq_mask = probe_irq_on();
+	g_NCR5380_trigger_irq(instance);
+	irq = probe_irq_off(irq_mask);
+	NCR5380_read(RESET_PARITY_INTERRUPT_REG);
+
+	if (irq <= 0)
+		return NO_IRQ;
+	return irq;
+}
+
+/*
+ * Configure I/O address of 53C400A or DTC436 by writing magic numbers
+ * to ports 0x779 and 0x379.
+ */
+static void magic_configure(int idx, u8 irq, u8 magic[])
+{
+	u8 cfg = 0;
+
+	outb(magic[0], 0x779);
+	outb(magic[1], 0x379);
+	outb(magic[2], 0x379);
+	outb(magic[3], 0x379);
+	outb(magic[4], 0x379);
+
+	if (irq == 9)
+		irq = 2;
+
+	if (idx >= 0 && idx <= 7)
+		cfg = 0x80 | idx | (irq << 4);
+	outb(cfg, 0x379);
+}
+
+static irqreturn_t legacy_empty_irq_handler(int irq, void *dev_id)
+{
+	return IRQ_HANDLED;
+}
+
+static int legacy_find_free_irq(int *irq_table)
+{
+	while (*irq_table != -1) {
+		if (!request_irq(*irq_table, legacy_empty_irq_handler,
+		                 IRQF_PROBE_SHARED, "Test IRQ",
+		                 (void *)irq_table)) {
+			free_irq(*irq_table, (void *) irq_table);
+			return *irq_table;
+		}
+		irq_table++;
+	}
+	return -1;
+}
+
+static unsigned int ncr_53c400a_ports[] = {
+	0x280, 0x290, 0x300, 0x310, 0x330, 0x340, 0x348, 0x350, 0
+};
+static unsigned int dtc_3181e_ports[] = {
+	0x220, 0x240, 0x280, 0x2a0, 0x2c0, 0x300, 0x320, 0x340, 0
+};
+static u8 ncr_53c400a_magic[] = {	/* 53C400A & DTC436 */
+	0x59, 0xb9, 0xc5, 0xae, 0xa6
+};
+static u8 hp_c2502_magic[] = {	/* HP C2502 */
+	0x0f, 0x22, 0xf0, 0x20, 0x80
+};
+static int hp_c2502_irqs[] = {
+	9, 5, 7, 3, 4, -1
+};
+
+static int generic_NCR5380_init_one(struct scsi_host_template *tpnt,
+			struct device *pdev, int base, int irq, int board)
+{
+	bool is_pmio = base <= 0xffff;
+	int ret;
+	int flags = 0;
+	unsigned int *ports = NULL;
+	u8 *magic = NULL;
+	int i;
+	int port_idx = -1;
+	unsigned long region_size;
+	struct Scsi_Host *instance;
+	struct NCR5380_hostdata *hostdata;
+	u8 __iomem *iomem;
+
+	switch (board) {
+	case BOARD_NCR5380:
+		flags = FLAG_NO_PSEUDO_DMA | FLAG_DMA_FIXUP;
+		break;
+	case BOARD_NCR53C400A:
+		ports = ncr_53c400a_ports;
+		magic = ncr_53c400a_magic;
+		break;
+	case BOARD_HP_C2502:
+		ports = ncr_53c400a_ports;
+		magic = hp_c2502_magic;
+		break;
+	case BOARD_DTC3181E:
+		ports = dtc_3181e_ports;
+		magic = ncr_53c400a_magic;
+		break;
+	}
+
+	if (is_pmio && ports && magic) {
+		/* wakeup sequence for the NCR53C400A and DTC3181E */
+
+		/* Disable the adapter and look for a free io port */
+		magic_configure(-1, 0, magic);
+
+		region_size = 16;
+		if (base)
+			for (i = 0; ports[i]; i++) {
+				if (base == ports[i]) {	/* index found */
+					if (!request_region(ports[i],
+							    region_size,
+							    "ncr53c80"))
+						return -EBUSY;
+					break;
+				}
+			}
+		else
+			for (i = 0; ports[i]; i++) {
+				if (!request_region(ports[i], region_size,
+						    "ncr53c80"))
+					continue;
+				if (inb(ports[i]) == 0xff)
+					break;
+				release_region(ports[i], region_size);
+			}
+		if (ports[i]) {
+			/* At this point we have our region reserved */
+			magic_configure(i, 0, magic); /* no IRQ yet */
+			base = ports[i];
+			outb(0xc0, base + 9);
+			if (inb(base + 9) != 0x80) {
+				ret = -ENODEV;
+				goto out_release;
+			}
+			port_idx = i;
+		} else
+			return -EINVAL;
+	} else if (is_pmio) {
+		/* NCR5380 - no configuration, just grab */
+		region_size = 8;
+		if (!base || !request_region(base, region_size, "ncr5380"))
+			return -EBUSY;
+	} else {	/* MMIO */
+		region_size = NCR53C400_region_size;
+		if (!request_mem_region(base, region_size, "ncr5380"))
+			return -EBUSY;
+	}
+
+	if (is_pmio)
+		iomem = ioport_map(base, region_size);
+	else
+		iomem = ioremap(base, region_size);
+
+	if (!iomem) {
+		ret = -ENOMEM;
+		goto out_release;
+	}
+
+	instance = scsi_host_alloc(tpnt, sizeof(struct NCR5380_hostdata));
+	if (instance == NULL) {
+		ret = -ENOMEM;
+		goto out_unmap;
+	}
+	hostdata = shost_priv(instance);
+
+	hostdata->board = board;
+	hostdata->io = iomem;
+	hostdata->region_size = region_size;
+
+	if (is_pmio) {
+		hostdata->io_port = base;
+		hostdata->io_width = 1; /* 8-bit PDMA by default */
+		hostdata->offset = 0;
+
+		/*
+		 * On NCR53C400 boards, NCR5380 registers are mapped 8 past
+		 * the base address.
+		 */
+		switch (board) {
+		case BOARD_NCR53C400:
+			hostdata->io_port += 8;
+			hostdata->c400_ctl_status = 0;
+			hostdata->c400_blk_cnt = 1;
+			hostdata->c400_host_buf = 4;
+			break;
+		case BOARD_DTC3181E:
+			hostdata->io_width = 2;	/* 16-bit PDMA */
+			/* fall through */
+		case BOARD_NCR53C400A:
+		case BOARD_HP_C2502:
+			hostdata->c400_ctl_status = 9;
+			hostdata->c400_blk_cnt = 10;
+			hostdata->c400_host_buf = 8;
+			break;
+		}
+	} else {
+		hostdata->base = base;
+		hostdata->offset = NCR53C400_mem_base;
+		switch (board) {
+		case BOARD_NCR53C400:
+			hostdata->c400_ctl_status = 0x100;
+			hostdata->c400_blk_cnt = 0x101;
+			hostdata->c400_host_buf = 0x104;
+			break;
+		case BOARD_DTC3181E:
+		case BOARD_NCR53C400A:
+		case BOARD_HP_C2502:
+			pr_err(DRV_MODULE_NAME ": unknown register offsets\n");
+			ret = -EINVAL;
+			goto out_unregister;
+		}
+	}
+
+	/* Check for vacant slot */
+	NCR5380_write(MODE_REG, 0);
+	if (NCR5380_read(MODE_REG) != 0) {
+		ret = -ENODEV;
+		goto out_unregister;
+	}
+
+	ret = NCR5380_init(instance, flags | FLAG_LATE_DMA_SETUP);
+	if (ret)
+		goto out_unregister;
+
+	switch (board) {
+	case BOARD_NCR53C400:
+	case BOARD_DTC3181E:
+	case BOARD_NCR53C400A:
+	case BOARD_HP_C2502:
+		NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
+	}
+
+	NCR5380_maybe_reset_bus(instance);
+
+	/* Compatibility with documented NCR5380 kernel parameters */
+	if (irq == 255 || irq == 0)
+		irq = NO_IRQ;
+	else if (irq == -1)
+		irq = IRQ_AUTO;
+
+	if (board == BOARD_HP_C2502) {
+		int *irq_table = hp_c2502_irqs;
+		int board_irq = -1;
+
+		switch (irq) {
+		case NO_IRQ:
+			board_irq = 0;
+			break;
+		case IRQ_AUTO:
+			board_irq = legacy_find_free_irq(irq_table);
+			break;
+		default:
+			while (*irq_table != -1)
+				if (*irq_table++ == irq)
+					board_irq = irq;
+		}
+
+		if (board_irq <= 0) {
+			board_irq = 0;
+			irq = NO_IRQ;
+		}
+
+		magic_configure(port_idx, board_irq, magic);
+	}
+
+	if (irq == IRQ_AUTO) {
+		instance->irq = g_NCR5380_probe_irq(instance);
+		if (instance->irq == NO_IRQ)
+			shost_printk(KERN_INFO, instance, "no irq detected\n");
+	} else {
+		instance->irq = irq;
+		if (instance->irq == NO_IRQ)
+			shost_printk(KERN_INFO, instance, "no irq provided\n");
+	}
+
+	if (instance->irq != NO_IRQ) {
+		if (request_irq(instance->irq, generic_NCR5380_intr,
+				0, "NCR5380", instance)) {
+			instance->irq = NO_IRQ;
+			shost_printk(KERN_INFO, instance,
+			             "irq %d denied\n", instance->irq);
+		} else {
+			shost_printk(KERN_INFO, instance,
+			             "irq %d acquired\n", instance->irq);
+		}
+	}
+
+	ret = scsi_add_host(instance, pdev);
+	if (ret)
+		goto out_free_irq;
+	scsi_scan_host(instance);
+	dev_set_drvdata(pdev, instance);
+	return 0;
+
+out_free_irq:
+	if (instance->irq != NO_IRQ)
+		free_irq(instance->irq, instance);
+	NCR5380_exit(instance);
+out_unregister:
+	scsi_host_put(instance);
+out_unmap:
+	iounmap(iomem);
+out_release:
+	if (is_pmio)
+		release_region(base, region_size);
+	else
+		release_mem_region(base, region_size);
+	return ret;
+}
+
+static void generic_NCR5380_release_resources(struct Scsi_Host *instance)
+{
+	struct NCR5380_hostdata *hostdata = shost_priv(instance);
+	void __iomem *iomem = hostdata->io;
+	unsigned long io_port = hostdata->io_port;
+	unsigned long base = hostdata->base;
+	unsigned long region_size = hostdata->region_size;
+
+	scsi_remove_host(instance);
+	if (instance->irq != NO_IRQ)
+		free_irq(instance->irq, instance);
+	NCR5380_exit(instance);
+	scsi_host_put(instance);
+	iounmap(iomem);
+	if (io_port)
+		release_region(io_port, region_size);
+	else
+		release_mem_region(base, region_size);
+}
+
+/* wait_for_53c80_access - wait for 53C80 registers to become accessible
+ * @hostdata: scsi host private data
+ *
+ * The registers within the 53C80 logic block are inaccessible until
+ * bit 7 in the 53C400 control status register gets asserted.
+ */
+
+static void wait_for_53c80_access(struct NCR5380_hostdata *hostdata)
+{
+	int count = 10000;
+
+	do {
+		if (hostdata->board == BOARD_DTC3181E)
+			udelay(4); /* DTC436 chip hangs without this */
+		if (NCR5380_read(hostdata->c400_ctl_status) & CSR_53C80_REG)
+			return;
+	} while (--count > 0);
+
+	scmd_printk(KERN_ERR, hostdata->connected,
+	            "53c80 registers not accessible, device will be reset\n");
+	NCR5380_write(hostdata->c400_ctl_status, CSR_RESET);
+	NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
+}
+
+/**
+ * generic_NCR5380_precv - pseudo DMA receive
+ * @hostdata: scsi host private data
+ * @dst: buffer to write into
+ * @len: transfer size
+ *
+ * Perform a pseudo DMA mode receive from a 53C400 or equivalent device.
+ */
+
+static inline int generic_NCR5380_precv(struct NCR5380_hostdata *hostdata,
+                                        unsigned char *dst, int len)
+{
+	int residual;
+	int start = 0;
+
+	NCR5380_write(hostdata->c400_ctl_status, CSR_BASE | CSR_TRANS_DIR);
+	NCR5380_write(hostdata->c400_blk_cnt, len / 128);
+
+	do {
+		if (start == len - 128) {
+			/* Ignore End of DMA interrupt for the final buffer */
+			if (NCR5380_poll_politely(hostdata, hostdata->c400_ctl_status,
+			                          CSR_HOST_BUF_NOT_RDY, 0, HZ / 64) < 0)
+				break;
+		} else {
+			if (NCR5380_poll_politely2(hostdata, hostdata->c400_ctl_status,
+			                           CSR_HOST_BUF_NOT_RDY, 0,
+			                           hostdata->c400_ctl_status,
+			                           CSR_GATED_53C80_IRQ,
+			                           CSR_GATED_53C80_IRQ, HZ / 64) < 0 ||
+			    NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY)
+				break;
+		}
+
+		if (hostdata->io_port && hostdata->io_width == 2)
+			insw(hostdata->io_port + hostdata->c400_host_buf,
+			     dst + start, 64);
+		else if (hostdata->io_port)
+			insb(hostdata->io_port + hostdata->c400_host_buf,
+			     dst + start, 128);
+		else
+			memcpy_fromio(dst + start,
+				hostdata->io + NCR53C400_host_buffer, 128);
+		start += 128;
+	} while (start < len);
+
+	residual = len - start;
+
+	if (residual != 0) {
+		/* 53c80 interrupt or transfer timeout. Reset 53c400 logic. */
+		NCR5380_write(hostdata->c400_ctl_status, CSR_RESET);
+		NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
+	}
+	wait_for_53c80_access(hostdata);
+
+	if (residual == 0 && NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG,
+	                                           BASR_END_DMA_TRANSFER,
+	                                           BASR_END_DMA_TRANSFER,
+	                                           HZ / 64) < 0)
+		scmd_printk(KERN_ERR, hostdata->connected, "%s: End of DMA timeout\n",
+		            __func__);
+
+	hostdata->pdma_residual = residual;
+
+	return 0;
+}
+
+/**
+ * generic_NCR5380_psend - pseudo DMA send
+ * @hostdata: scsi host private data
+ * @src: buffer to read from
+ * @len: transfer size
+ *
+ * Perform a pseudo DMA mode send to a 53C400 or equivalent device.
+ */
+
+static inline int generic_NCR5380_psend(struct NCR5380_hostdata *hostdata,
+                                        unsigned char *src, int len)
+{
+	int residual;
+	int start = 0;
+
+	NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
+	NCR5380_write(hostdata->c400_blk_cnt, len / 128);
+
+	do {
+		if (NCR5380_poll_politely2(hostdata, hostdata->c400_ctl_status,
+		                           CSR_HOST_BUF_NOT_RDY, 0,
+		                           hostdata->c400_ctl_status,
+		                           CSR_GATED_53C80_IRQ,
+		                           CSR_GATED_53C80_IRQ, HZ / 64) < 0 ||
+		    NCR5380_read(hostdata->c400_ctl_status) & CSR_HOST_BUF_NOT_RDY) {
+			/* Both 128 B buffers are in use */
+			if (start >= 128)
+				start -= 128;
+			if (start >= 128)
+				start -= 128;
+			break;
+		}
+
+		if (start >= len && NCR5380_read(hostdata->c400_blk_cnt) == 0)
+			break;
+
+		if (NCR5380_read(hostdata->c400_ctl_status) & CSR_GATED_53C80_IRQ) {
+			/* Host buffer is empty, other one is in use */
+			if (start >= 128)
+				start -= 128;
+			break;
+		}
+
+		if (start >= len)
+			continue;
+
+		if (hostdata->io_port && hostdata->io_width == 2)
+			outsw(hostdata->io_port + hostdata->c400_host_buf,
+			      src + start, 64);
+		else if (hostdata->io_port)
+			outsb(hostdata->io_port + hostdata->c400_host_buf,
+			      src + start, 128);
+		else
+			memcpy_toio(hostdata->io + NCR53C400_host_buffer,
+			            src + start, 128);
+		start += 128;
+	} while (1);
+
+	residual = len - start;
+
+	if (residual != 0) {
+		/* 53c80 interrupt or transfer timeout. Reset 53c400 logic. */
+		NCR5380_write(hostdata->c400_ctl_status, CSR_RESET);
+		NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
+	}
+	wait_for_53c80_access(hostdata);
+
+	if (residual == 0) {
+		if (NCR5380_poll_politely(hostdata, TARGET_COMMAND_REG,
+		                          TCR_LAST_BYTE_SENT, TCR_LAST_BYTE_SENT,
+		                          HZ / 64) < 0)
+			scmd_printk(KERN_ERR, hostdata->connected,
+			            "%s: Last Byte Sent timeout\n", __func__);
+
+		if (NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG,
+		                          BASR_END_DMA_TRANSFER, BASR_END_DMA_TRANSFER,
+		                          HZ / 64) < 0)
+			scmd_printk(KERN_ERR, hostdata->connected, "%s: End of DMA timeout\n",
+			            __func__);
+	}
+
+	hostdata->pdma_residual = residual;
+
+	return 0;
+}
+
+static int generic_NCR5380_dma_xfer_len(struct NCR5380_hostdata *hostdata,
+                                        struct scsi_cmnd *cmd)
+{
+	int transfersize = cmd->SCp.this_residual;
+
+	if (hostdata->flags & FLAG_NO_PSEUDO_DMA)
+		return 0;
+
+	/* 53C400 datasheet: non-modulo-128-byte transfers should use PIO */
+	if (transfersize % 128)
+		return 0;
+
+	/* Limit PDMA send to 512 B to avoid random corruption on DTC3181E */
+	if (hostdata->board == BOARD_DTC3181E &&
+	    cmd->sc_data_direction == DMA_TO_DEVICE)
+		transfersize = min(cmd->SCp.this_residual, 512);
+
+	return min(transfersize, DMA_MAX_SIZE);
+}
+
+static int generic_NCR5380_dma_residual(struct NCR5380_hostdata *hostdata)
+{
+	return hostdata->pdma_residual;
+}
+
+/* Include the core driver code. */
+
+#include "NCR5380.c"
+
+static struct scsi_host_template driver_template = {
+	.module			= THIS_MODULE,
+	.proc_name		= DRV_MODULE_NAME,
+	.name			= "Generic NCR5380/NCR53C400 SCSI",
+	.info			= generic_NCR5380_info,
+	.queuecommand		= generic_NCR5380_queue_command,
+	.eh_abort_handler	= generic_NCR5380_abort,
+	.eh_host_reset_handler	= generic_NCR5380_host_reset,
+	.can_queue		= 16,
+	.this_id		= 7,
+	.sg_tablesize		= SG_ALL,
+	.cmd_per_lun		= 2,
+	.use_clustering		= DISABLE_CLUSTERING,
+	.cmd_size		= NCR5380_CMD_SIZE,
+	.max_sectors		= 128,
+};
+
+static int generic_NCR5380_isa_match(struct device *pdev, unsigned int ndev)
+{
+	int ret = generic_NCR5380_init_one(&driver_template, pdev, base[ndev],
+	                                   irq[ndev], card[ndev]);
+	if (ret) {
+		if (base[ndev])
+			printk(KERN_WARNING "Card not found at address 0x%03x\n",
+			       base[ndev]);
+		return 0;
+	}
+
+	return 1;
+}
+
+static int generic_NCR5380_isa_remove(struct device *pdev,
+                                      unsigned int ndev)
+{
+	generic_NCR5380_release_resources(dev_get_drvdata(pdev));
+	dev_set_drvdata(pdev, NULL);
+	return 0;
+}
+
+static struct isa_driver generic_NCR5380_isa_driver = {
+	.match		= generic_NCR5380_isa_match,
+	.remove		= generic_NCR5380_isa_remove,
+	.driver		= {
+		.name	= DRV_MODULE_NAME
+	},
+};
+
+#ifdef CONFIG_PNP
+static const struct pnp_device_id generic_NCR5380_pnp_ids[] = {
+	{ .id = "DTC436e", .driver_data = BOARD_DTC3181E },
+	{ .id = "" }
+};
+MODULE_DEVICE_TABLE(pnp, generic_NCR5380_pnp_ids);
+
+static int generic_NCR5380_pnp_probe(struct pnp_dev *pdev,
+                                     const struct pnp_device_id *id)
+{
+	int base, irq;
+
+	if (pnp_activate_dev(pdev) < 0)
+		return -EBUSY;
+
+	base = pnp_port_start(pdev, 0);
+	irq = pnp_irq(pdev, 0);
+
+	return generic_NCR5380_init_one(&driver_template, &pdev->dev, base, irq,
+	                                id->driver_data);
+}
+
+static void generic_NCR5380_pnp_remove(struct pnp_dev *pdev)
+{
+	generic_NCR5380_release_resources(pnp_get_drvdata(pdev));
+	pnp_set_drvdata(pdev, NULL);
+}
+
+static struct pnp_driver generic_NCR5380_pnp_driver = {
+	.name		= DRV_MODULE_NAME,
+	.id_table	= generic_NCR5380_pnp_ids,
+	.probe		= generic_NCR5380_pnp_probe,
+	.remove		= generic_NCR5380_pnp_remove,
+};
+#endif /* defined(CONFIG_PNP) */
+
+static int pnp_registered, isa_registered;
+
+static int __init generic_NCR5380_init(void)
+{
+	int ret = 0;
+
+	/* compatibility with old-style parameters */
+	if (irq[0] == -1 && base[0] == 0 && card[0] == -1) {
+		irq[0] = ncr_irq;
+		base[0] = ncr_addr;
+		if (ncr_5380)
+			card[0] = BOARD_NCR5380;
+		if (ncr_53c400)
+			card[0] = BOARD_NCR53C400;
+		if (ncr_53c400a)
+			card[0] = BOARD_NCR53C400A;
+		if (dtc_3181e)
+			card[0] = BOARD_DTC3181E;
+		if (hp_c2502)
+			card[0] = BOARD_HP_C2502;
+	}
+
+#ifdef CONFIG_PNP
+	if (!pnp_register_driver(&generic_NCR5380_pnp_driver))
+		pnp_registered = 1;
+#endif
+	ret = isa_register_driver(&generic_NCR5380_isa_driver, MAX_CARDS);
+	if (!ret)
+		isa_registered = 1;
+
+	return (pnp_registered || isa_registered) ? 0 : ret;
+}
+
+static void __exit generic_NCR5380_exit(void)
+{
+#ifdef CONFIG_PNP
+	if (pnp_registered)
+		pnp_unregister_driver(&generic_NCR5380_pnp_driver);
+#endif
+	if (isa_registered)
+		isa_unregister_driver(&generic_NCR5380_isa_driver);
+}
+
+module_init(generic_NCR5380_init);
+module_exit(generic_NCR5380_exit);