patch-2.1.88 linux/drivers/acorn/scsi/powertec.c

• Lines: 411
• Date: Wed Feb 18 14:55:07 1998
• Orig file: v2.1.87/linux/drivers/acorn/scsi/powertec.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.87/linux/drivers/acorn/scsi/powertec.c linux/drivers/acorn/scsi/powertec.c
@@ -0,0 +1,410 @@
+/*
+ * linux/arch/arm/drivers/scsi/powertec.c
+ *
+ * Copyright (C) 1997 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	Added DMA support and hardware definitions
+ */
+
+#include <linux/module.h>
+#include <linux/blk.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/proc_fs.h>
+#include <linux/unistd.h>
+#include <linux/stat.h>
+
+#include <asm/delay.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/dma.h>
+#include <asm/ecard.h>
+#include <asm/pgtable.h>
+
+#include "../../scsi/sd.h"
+#include "../../scsi/hosts.h"
+#include "powertec.h"
+
+/* Configuration */
+#define POWERTEC_XTALFREQ	40
+#define POWERTEC_ASYNC_PERIOD	200
+#define POWERTEC_SYNC_DEPTH	16
+
+/*
+ * List of devices that the driver will recognise
+ */
+#define POWERTECSCSI_LIST	{ MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI }
+
+#define POWERTEC_FAS216_OFFSET	0xc00
+#define POWERTEC_FAS216_SHIFT	4
+#define POWERTEC_INTR_STATUS	0x800
+#define POWERTEC_INTR_BIT	0x80
+#define POWERTEC_INTR_CONTROL	0x407
+#define POWERTEC_INTR_ENABLE	1
+#define POWERTEC_INTR_DISABLE	0
+
+/*
+ * Version
+ */
+#define VER_MAJOR	0
+#define VER_MINOR	0
+#define VER_PATCH	1
+
+static struct expansion_card *ecs[MAX_ECARDS];
+
+static struct proc_dir_entry proc_scsi_powertec = {
+	PROC_SCSI_QLOGICISP, 8, "powertec",
+	S_IFDIR | S_IRUGO | S_IXUGO, 2
+};
+
+/* Function: 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)
+{
+	unsigned int port = (unsigned int)ec->irq_data;
+	outb(POWERTEC_INTR_ENABLE, port);
+}
+
+/* Function: 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)
+{
+	unsigned int port = (unsigned int)ec->irq_data;
+	outb(POWERTEC_INTR_DISABLE, port);
+}
+
+static const expansioncard_ops_t powertecscsi_ops = {
+	powertecscsi_irqenable,
+	powertecscsi_irqdisable,
+	NULL,
+	NULL
+};
+
+/* Function: void powertecscsi_intr(int irq, void *dev_id,
+ *				    struct pt_regs *regs)
+ * Purpose : handle interrupts from Powertec SCSI card
+ * Params  : irq - interrupt number
+ *	     dev_id - user-defined (Scsi_Host structure)
+ *	     regs - processor registers at interrupt
+ */
+static void
+powertecscsi_intr(int irq, void *dev_id, struct pt_regs *regs)
+{
+    struct Scsi_Host *instance = (struct Scsi_Host *)dev_id;
+
+    fas216_intr(instance);
+}
+
+static void
+powertecscsi_invalidate(char *addr, long len, fasdmadir_t direction)
+{
+	unsigned int page;
+
+	if (direction == DMA_OUT) {
+		for (page = (unsigned int) addr; len > 0;
+		     page += PAGE_SIZE, len -= PAGE_SIZE)
+			flush_page_to_ram(page);
+	} else
+		flush_cache_range(current->mm, (unsigned long)addr,
+				  (unsigned long)addr + len);
+}
+
+/* Function: fasdmatype_t powertecscsi_dma_setup(instance, SCpnt, direction)
+ * Purpose : initialises DMA/PIO
+ * Params  : instance  - host
+ *	     SCpnt     - command
+ *	     direction - DMA on to/off of card
+ * Returns : type of transfer to be performed
+ */
+static fasdmatype_t
+powertecscsi_dma_setup(struct Scsi_Host *instance, Scsi_Pointer *SCp,
+		       fasdmadir_t direction)
+{
+	if (instance->dma_channel != NO_DMA && SCp->this_residual >= 512) {
+		int buf;
+static		dmasg_t dmasg[256];
+
+		for (buf = 1; buf <= SCp->buffers_residual; buf++) {
+			dmasg[buf].address = __virt_to_bus(
+				(unsigned long)SCp->buffer[buf].address);
+			dmasg[buf].length = SCp->buffer[buf].length;
+
+			powertecscsi_invalidate(SCp->buffer[buf].address,
+						SCp->buffer[buf].length,
+						direction);
+		}
+
+		dmasg[0].address = __virt_to_phys((unsigned long)SCp->ptr);
+		dmasg[0].length = SCp->this_residual;
+		powertecscsi_invalidate(SCp->ptr,
+					SCp->this_residual, direction);
+
+		disable_dma(instance->dma_channel);
+		set_dma_sg(instance->dma_channel, dmasg, buf);
+		set_dma_mode(instance->dma_channel,
+			     direction == DMA_OUT ? DMA_MODE_WRITE :
+						    DMA_MODE_READ);
+		enable_dma(instance->dma_channel);
+		return fasdma_real_all;
+	}
+	/*
+	 * We don't do DMA, we only do slow PIO
+	 */
+	return fasdma_none;
+}
+
+/* Function: int powertecscsi_dma_stop(instance, SCpnt)
+ * Purpose : stops DMA/PIO
+ * Params  : instance  - host
+ *	     SCpnt     - command
+ */
+static void
+powertecscsi_dma_stop(struct Scsi_Host *instance, Scsi_Pointer *SCp)
+{
+	if (instance->dma_channel != NO_DMA)
+		disable_dma(instance->dma_channel);
+}
+
+/* Function: int powertecscsi_detect(Scsi_Host_Template * tpnt)
+ * Purpose : initialises PowerTec SCSI driver
+ * Params  : tpnt - template for this SCSI adapter
+ * Returns : >0 if host found, 0 otherwise.
+ */
+int
+powertecscsi_detect(Scsi_Host_Template *tpnt)
+{
+	static const card_ids powertecscsi_cids[] =
+			{ POWERTECSCSI_LIST, { 0xffff, 0xffff} };
+	int count = 0;
+	struct Scsi_Host *instance;
+  
+	tpnt->proc_dir = &proc_scsi_powertec;
+	memset(ecs, 0, sizeof (ecs));
+
+	ecard_startfind();
+
+	while(1) {
+	    	PowerTecScsi_Info *info;
+
+		ecs[count] = ecard_find(0, powertecscsi_cids);
+		if (!ecs[count])
+			break;
+
+		ecard_claim(ecs[count]);
+
+		instance = scsi_register(tpnt, sizeof (PowerTecScsi_Info));
+		if (!instance) {
+			ecard_release(ecs[count]);
+			break;
+		}
+
+		instance->io_port = ecard_address(ecs[count], ECARD_IOC, 0);
+		instance->irq = ecs[count]->irq;
+
+		ecs[count]->irqaddr = (unsigned char *)
+			    ioaddr(instance->io_port + POWERTEC_INTR_STATUS);
+		ecs[count]->irqmask = POWERTEC_INTR_BIT;
+		ecs[count]->irq_data = (void *)
+			    (instance->io_port + POWERTEC_INTR_CONTROL);
+		ecs[count]->ops = (expansioncard_ops_t *)&powertecscsi_ops;
+
+		request_region(instance->io_port + POWERTEC_FAS216_OFFSET,
+				16 << POWERTEC_FAS216_SHIFT, "powertec2-fas");
+
+		if (request_irq(instance->irq, powertecscsi_intr,
+				SA_INTERRUPT, "powertec", instance)) {
+			printk("scsi%d: IRQ%d not free, interrupts disabled\n",
+			       instance->host_no, instance->irq);
+			instance->irq = NO_IRQ;
+		}
+
+		info = (PowerTecScsi_Info *)instance->hostdata;
+
+		instance->dma_channel = 3; /* slot 1 */
+		if (request_dma(instance->dma_channel, "powertec")) {
+			printk("scsi%d: DMA%d not free, DMA disabled\n",
+			       instance->host_no, instance->dma_channel);
+			instance->dma_channel = NO_DMA;
+		}
+
+		info->info.scsi.io_port	=
+				instance->io_port + POWERTEC_FAS216_OFFSET;
+		info->info.scsi.io_shift= POWERTEC_FAS216_SHIFT;
+		info->info.scsi.irq	= instance->irq;
+		info->info.ifcfg.clockrate = POWERTEC_XTALFREQ;
+		info->info.ifcfg.select_timeout = 255;
+		info->info.ifcfg.asyncperiod = POWERTEC_ASYNC_PERIOD;
+		info->info.ifcfg.sync_max_depth = POWERTEC_SYNC_DEPTH;
+		info->info.dma.setup	= powertecscsi_dma_setup;
+		info->info.dma.pseudo	= NULL;
+		info->info.dma.stop	= powertecscsi_dma_stop;
+
+		fas216_init(instance);
+		++count;
+	}
+	return count;
+}
+
+/* Function: int powertecscsi_release(struct Scsi_Host * host)
+ * Purpose : releases all resources used by this adapter
+ * Params  : host - driver host structure to return info for.
+ * Returns : nothing
+ */
+int powertecscsi_release(struct Scsi_Host *instance)
+{
+	int i;
+
+	fas216_release(instance);
+
+	if (instance->irq != NO_IRQ)
+		free_irq(instance->irq, instance);
+	if (instance->dma_channel != NO_DMA)
+		free_dma(instance->dma_channel);
+	release_region(instance->io_port + POWERTEC_FAS216_OFFSET,
+		       16 << POWERTEC_FAS216_SHIFT);
+
+	for (i = 0; i < MAX_ECARDS; i++)
+		if (ecs[i] &&
+		    instance->io_port == ecard_address(ecs[i], ECARD_IOC, 0))
+			ecard_release(ecs[i]);
+	return 0;
+}
+
+/* Function: 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)
+{
+	PowerTecScsi_Info *info = (PowerTecScsi_Info *)host->hostdata;
+	static char string[100], *p;
+
+	p = string;
+	p += sprintf(string, "%s at port %X ",
+		     host->hostt->name, host->io_port);
+
+	if (host->irq != NO_IRQ)
+		p += sprintf(p, "irq %d ", host->irq);
+	else
+		p += sprintf(p, "NO IRQ ");
+
+	if (host->dma_channel != NO_DMA)
+		p += sprintf(p, "dma %d ", host->dma_channel);
+	else
+		p += sprintf(p, "NO DMA ");
+
+	p += sprintf(p, "v%d.%d.%d scsi %s",
+		     VER_MAJOR, VER_MINOR, VER_PATCH,
+		     info->info.scsi.type);
+
+	return string;
+}
+
+/* Function: 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 upto.
+ *	     length - length of buffer
+ *	     host_no - host number to return information for
+ *	     inout  - 0 for reading, 1 for writing.
+ * Returns : length of data written to buffer.
+ */
+int powertecscsi_proc_info(char *buffer, char **start, off_t offset,
+			    int length, int host_no, int inout)
+{
+	int pos, begin;
+	struct Scsi_Host *host = scsi_hostlist;
+	PowerTecScsi_Info *info;
+	Scsi_Device *scd;
+
+	while (host) {
+		if (host->host_no == host_no)
+			break;
+		host = host->next;
+	}
+	if (!host)
+		return 0;
+
+	info = (PowerTecScsi_Info *)host->hostdata;
+	if (inout == 1)
+		return -EINVAL;
+
+	begin = 0;
+	pos = sprintf(buffer,
+			"PowerTec SCSI driver version %d.%d.%d\n",
+			VER_MAJOR, VER_MINOR, VER_PATCH);
+	pos += sprintf(buffer + pos,
+			"Address: %08X    IRQ : %d     DMA : %d\n"
+			"FAS    : %s\n\n"
+			"Statistics:\n",
+			host->io_port, host->irq, host->dma_channel,
+			info->info.scsi.type);
+
+	pos += sprintf(buffer+pos,
+			"Queued commands: %-10d   Issued commands: %-10d\n"
+			"Done commands  : %-10d   Reads          : %-10d\n"
+			"Writes         : %-10d   Others         : %-10d\n"
+			"Disconnects    : %-10d   Aborts         : %-10d\n"
+			"Resets         : %-10d\n",
+			info->info.stats.queues,      info->info.stats.removes,
+			info->info.stats.fins,        info->info.stats.reads,
+			info->info.stats.writes,      info->info.stats.miscs,
+			info->info.stats.disconnects, info->info.stats.aborts,
+			info->info.stats.resets);
+
+	pos += sprintf (buffer+pos, "\nAttached devices:%s\n", host->host_queue ? "" : " none");
+
+	for (scd = host->host_queue; scd; scd = scd->next) {
+		int len;
+
+		proc_print_scsidevice (scd, buffer, &len, pos);
+		pos += len;
+		pos += sprintf (buffer+pos, "Extensions: ");
+		if (scd->tagged_supported)
+			pos += sprintf (buffer+pos, "TAG %sabled [%d] ",
+				    scd->tagged_queue ? "en" : "dis",
+				    scd->current_tag);
+		pos += sprintf (buffer+pos, "\n");
+
+		if (pos + begin < offset) {
+			begin += pos;
+			pos = 0;
+		}
+		if (pos + begin > offset + length)
+			break;
+	}
+
+	*start = buffer + (offset - begin);
+	pos -= offset - begin;
+	if (pos > length)
+		pos = length;
+
+	return pos;
+}
+
+#ifdef MODULE
+Scsi_Host_Template driver_template = POWERTECSCSI;
+
+#include "../../scsi/scsi_module.c"
+#endif