1 files changed, 451 insertions, 0 deletions

diff --git a/kernel/drivers/scsi/arm/powertec.c b/kernel/drivers/scsi/arm/powertec.c
new file mode 100644
index 000000000..5e1b73e1b
--- /dev/null
+++ b/kernel/drivers/scsi/arm/powertec.c
@@ -0,0 +1,451 @@
+/*
+ *  linux/drivers/acorn/scsi/powertec.c
+ *
+ *  Copyright (C) 1997-2005 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#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 <asm/dma.h>
+#include <asm/ecard.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+
+#include "../scsi.h"
+#include <scsi/scsi_host.h>
+#include "fas216.h"
+#include "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,
+
+	.can_queue			= 8,
+	.this_id			= 7,
+	.sg_tablesize			= SCSI_MAX_SG_CHAIN_SEGMENTS,
+	.dma_boundary			= IOMD_DMA_BOUNDARY,
+	.cmd_per_lun			= 2,
+	.use_clustering			= ENABLE_CLUSTERING,
+	.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, host);
+
+ 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");