patch-2.2.18 linux/drivers/acorn/scsi/arxescsi.c

• Lines: 396
• Date: Fri Sep 15 23:31:12 2000
• Orig file: v2.2.17/drivers/acorn/scsi/arxescsi.c
• Orig date: Thu Jan 1 01:00:00 1970

diff -u --new-file --recursive --exclude-from /usr/src/exclude v2.2.17/drivers/acorn/scsi/arxescsi.c linux/drivers/acorn/scsi/arxescsi.c
@@ -0,0 +1,395 @@
+/*
+ * linux/arch/arm/drivers/scsi/cumana_2.c
+ *
+ * Copyright (C) 1997,1998 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:
+ *  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 		0.0.2   Changed to support ARXE 16-bit SCSI card, enabled writing
+ *  				by Stefan Hanske
+ */
+
+#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/dma.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/ecard.h>
+
+#include "../../scsi/sd.h"
+#include "../../scsi/hosts.h"
+#include "arxescsi.h"
+#include "fas216.h"
+
+/* Hmm - this should go somewhere else */
+#define BUS_ADDR(x) ((((unsigned long)(x)) << 2) + IO_BASE)
+
+/* Configuration */
+#define ARXESCSI_XTALFREQ		24
+#define ARXESCSI_ASYNC_PERIOD		200
+#define ARXESCSI_SYNC_DEPTH		0
+
+/*
+ * List of devices that the driver will recognise
+ */
+#define ARXESCSI_LIST		{ MANU_ARXE, PROD_ARXE_SCSI }
+
+/*
+ * Version
+ */
+#define VER_MAJOR	0
+#define VER_MINOR	0
+#define VER_PATCH	2
+
+static struct expansion_card *ecs[MAX_ECARDS];
+
+static struct proc_dir_entry proc_scsi_arxescsi = {
+	PROC_SCSI_QLOGICFAS, 6, "arxescsi",
+	S_IFDIR | S_IRUGO | S_IXUGO, 2
+};
+
+/*
+ * 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, Scsi_Pointer *SCp,
+		       fasdmadir_t direction, fasdmatype_t min_type)
+{
+	/*
+	 * We don't do real DMA
+	 */
+	return fasdma_pseudo;
+}
+
+
+
+/* Faster transfer routines, written by SH to speed up the loops */
+
+static __inline__ unsigned char getb(unsigned int address, unsigned int reg)
+{
+	unsigned char value;
+
+	__asm__ __volatile__(
+	"ldrb	%0, [%1, %2, lsl #5]"
+	: "=r" (value)
+	: "r" (address), "r" (reg) );
+	return value;
+}
+
+static __inline__ unsigned int getw(unsigned int address, unsigned int reg)
+{
+	unsigned int value;
+	
+	__asm__ __volatile__(
+	"ldr	%0, [%1, %2, lsl #5]\n\t"
+	"mov	%0, %0, lsl #16\n\t"
+	"mov	%0, %0, lsr #16"
+	: "=r" (value)
+	: "r" (address), "r" (reg) );
+	return value;
+}
+
+static __inline__ void putw(unsigned int address, unsigned int reg, unsigned long value)
+{
+	__asm__ __volatile__(
+	"mov	%0, %0, lsl #16\n\t"
+	"str	%0, [%1, %2, lsl #5]"
+	:
+	: "r" (value), "r" (address), "r" (reg) );
+}
+
+
+/*
+ * 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
+ */
+void arxescsi_dma_pseudo(struct Scsi_Host *host, Scsi_Pointer *SCp,
+			fasdmadir_t direction, int transfer)
+{
+	ARXEScsi_Info *info = (ARXEScsi_Info *)host->hostdata;
+	unsigned int length, io, error=0;
+	unsigned char *addr;
+
+	length = SCp->this_residual;
+	addr = SCp->ptr;
+	io = __ioaddr(host->io_port);
+
+	if (direction == DMA_OUT) {
+		while (length > 0) {
+			unsigned long word;
+
+
+			word = *addr | *(addr + 1) << 8;
+			if (getb(io, 4) & STAT_INT)
+				break;
+
+			if (!(getb(io, 48) & CSTATUS_IRQ))
+				continue;
+
+			putw(io, 16, word);
+			if (length > 1) {
+				addr += 2;
+				length -= 2;
+			} else {
+				addr += 1;
+				length -= 1;
+			}
+		}
+	}
+	else {
+		if (transfer && (transfer & 255)) {
+			while (length >= 256) {
+				if (getb(io, 4) & STAT_INT) {
+					error=1;
+					break;
+				}
+	    
+				if (!(getb(io, 48) & CSTATUS_IRQ))
+					continue;
+
+				insw(info->dmaarea, addr, 256 >> 1);
+				addr += 256;
+				length -= 256;
+			}
+		}
+
+		if (!(error))
+			while (length > 0) {
+				unsigned long word;
+
+				if (getb(io, 4) & STAT_INT)
+					break;
+
+				if (!(getb(io, 48) & CSTATUS_IRQ))
+					continue;
+
+				word = getw(io, 16);
+				*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, Scsi_Pointer *SCp)
+{
+	/*
+	 * no DMA to stop
+	 */
+}
+
+/*
+ * Function: int arxescsi_detect(Scsi_Host_Template * tpnt)
+ * Purpose : initialises ARXE SCSI driver
+ * Params  : tpnt - template for this SCSI adapter
+ * Returns : >0 if host found, 0 otherwise.
+ */
+int arxescsi_detect(Scsi_Host_Template *tpnt)
+{
+	static const card_ids arxescsi_cids[] = { ARXESCSI_LIST, { 0xffff, 0xffff} };
+	int count = 0;
+	struct Scsi_Host *host;
+  
+	tpnt->proc_dir = &proc_scsi_arxescsi;
+	memset(ecs, 0, sizeof (ecs));
+
+	ecard_startfind();
+
+	while (1) {
+	    	ARXEScsi_Info *info;
+
+		ecs[count] = ecard_find(0, arxescsi_cids);
+		if (!ecs[count])
+			break;
+
+		ecard_claim(ecs[count]);
+		
+		host = scsi_register(tpnt, sizeof (ARXEScsi_Info));
+		if (!host) {
+			ecard_release(ecs[count]);
+			break;
+		}
+
+		host->io_port = ecard_address(ecs[count], ECARD_MEMC, 0) + 0x0800;
+		host->irq = NO_IRQ;
+		host->dma_channel = NO_DMA;
+		host->can_queue = 0; /* no command queueing */
+		info = (ARXEScsi_Info *)host->hostdata;
+
+		info->info.scsi.io_port		= host->io_port;
+		info->info.scsi.irq		= host->irq;
+		info->info.scsi.io_shift	= 3;
+		info->info.ifcfg.clockrate	= ARXESCSI_XTALFREQ;
+		info->info.ifcfg.select_timeout = 255;
+		info->info.ifcfg.asyncperiod	= ARXESCSI_ASYNC_PERIOD;
+		info->info.ifcfg.sync_max_depth	= ARXESCSI_SYNC_DEPTH;
+		info->info.ifcfg.cntl3		= CNTL3_FASTSCSI | CNTL3_FASTCLK;
+		info->info.ifcfg.disconnect_ok	= 0;
+		info->info.ifcfg.wide_max_size	= 0;
+		info->info.dma.setup		= arxescsi_dma_setup;
+		info->info.dma.pseudo		= arxescsi_dma_pseudo;
+		info->info.dma.stop		= arxescsi_dma_stop;
+		info->dmaarea			= host->io_port + 128;
+		info->cstatus			= host->io_port + 384;
+		
+		ecs[count]->irqaddr = (unsigned char *)BUS_ADDR(host->io_port);
+		ecs[count]->irqmask = CSTATUS_IRQ;
+
+		request_region(host->io_port      , 120, "arxescsi-fas");
+		request_region(host->io_port + 128, 384, "arxescsi-dma");
+
+		printk("scsi%d: Has no interrupts - using polling mode\n",
+		       host->host_no);
+
+		fas216_init(host);
+		++count;
+	}
+	return count;
+}
+
+/*
+ * Function: int arxescsi_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 arxescsi_release(struct Scsi_Host *host)
+{
+	int i;
+
+	fas216_release(host);
+
+	release_region(host->io_port, 120);
+	release_region(host->io_port + 128, 384);
+
+	for (i = 0; i < MAX_ECARDS; i++)
+		if (ecs[i] && host->io_port == (ecard_address(ecs[i], ECARD_MEMC, 0) + 0x0800))
+			ecard_release(ecs[i]);
+	return 0;
+}
+
+/*
+ * 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.
+ */
+const char *arxescsi_info(struct Scsi_Host *host)
+{
+	ARXEScsi_Info *info = (ARXEScsi_Info *)host->hostdata;
+	static char string[100], *p;
+
+	p = string;
+	p += sprintf(string, "%s at port %lX irq %d v%d.%d.%d scsi %s",
+		     host->hostt->name, host->io_port, host->irq,
+		     VER_MAJOR, VER_MINOR, VER_PATCH,
+		     info->info.scsi.type);
+
+	return string;
+}
+
+/*
+ * Function: int arxescsi_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 arxescsi_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;
+	ARXEScsi_Info *info;
+	Scsi_Device *scd;
+
+	while (host) {
+		if (host->host_no == host_no)
+			break;
+		host = host->next;
+	}
+	if (!host)
+		return 0;
+
+	info = (ARXEScsi_Info *)host->hostdata;
+	if (inout == 1)
+		return -EINVAL;
+
+	begin = 0;
+	pos = sprintf(buffer,
+			"ARXE 16-bit SCSI driver version %d.%d.%d\n",
+			VER_MAJOR, VER_MINOR, VER_PATCH);
+	pos += sprintf(buffer + pos,
+			"Address: %08lX          IRQ : %d\n"
+			"FAS    : %s\n\n"
+			"Statistics:\n",
+			host->io_port, host->irq, info->info.scsi.type);
+
+	pos += fas216_print_stats(&info->info, buffer + pos);
+
+	pos += sprintf (buffer+pos, "\nAttached devices:\n");
+
+	for (scd = host->host_queue; scd; scd = scd->next) {
+		pos += fas216_print_device(&info->info, scd, buffer + pos);
+
+		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 = ARXEScsi;
+
+#include "../../scsi/scsi_module.c"
+#endif