1 files changed, 646 insertions, 0 deletions

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");