drivers/scsi/arm/arxescsi.c - kernel/msm-4.9 - Gitiles

 /*
  * linux/drivers/scsi/arm/arxescsi.c
  *
  * Copyright (C) 1997-2000 Russell King, Stefan Hanske
  *
  * 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 	SH	0.0.2   Changed to support ARXE 16-bit SCSI card
  *				enabled writing
  *  01-01-2000	SH	0.1.0   Added *real* pseudo dma writing
  *				(arxescsi_pseudo_dma_write)
  *  02-04-2000	RMK	0.1.1	Updated for new error handling code.
  *  22-10-2000  SH		Updated for new registering scheme.
  */
 #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/unistd.h>
 #include <linux/stat.h>
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>

 #include <asm/dma.h>
 #include <asm/io.h>
 #include <asm/ecard.h>

 #include "../scsi.h"
 #include <scsi/scsi_host.h>
 #include "fas216.h"

 struct arxescsi_info {
 	FAS216_Info		info;
 	struct expansion_card	*ec;
 	void __iomem		*base;
 };

 #define DMADATA_OFFSET	(0x200)

 #define DMASTAT_OFFSET	(0x600)
 #define DMASTAT_DRQ	(1 << 0)

 #define CSTATUS_IRQ	(1 << 0)

 #define VERSION "1.10 (23/01/2003 2.5.57)"

 /*
  * 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, struct scsi_pointer *SCp,
 		       fasdmadir_t direction, fasdmatype_t min_type)
 {
 	/*
 	 * We don't do real DMA
 	 */
 	return fasdma_pseudo;
 }

 static void arxescsi_pseudo_dma_write(unsigned char *addr, void __iomem *base)
 {
        __asm__ __volatile__(
        "               stmdb   sp!, {r0-r12}\n"
        "               mov     r3, %0\n"
        "               mov     r1, %1\n"
        "               add     r2, r1, #512\n"
        "               mov     r4, #256\n"
        ".loop_1:       ldmia   r3!, {r6, r8, r10, r12}\n"
        "               mov     r5, r6, lsl #16\n"
        "               mov     r7, r8, lsl #16\n"
        ".loop_2:       ldrb    r0, [r1, #1536]\n"
        "               tst     r0, #1\n"
        "               beq     .loop_2\n"
        "               stmia   r2, {r5-r8}\n\t"
        "               mov     r9, r10, lsl #16\n"
        "               mov     r11, r12, lsl #16\n"
        ".loop_3:       ldrb    r0, [r1, #1536]\n"
        "               tst     r0, #1\n"
        "               beq     .loop_3\n"
        "               stmia   r2, {r9-r12}\n"
        "               subs    r4, r4, #16\n"
        "               bne     .loop_1\n"
        "               ldmia   sp!, {r0-r12}\n"
        :
        : "r" (addr), "r" (base));
 }

 /*
  * 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
  */
 static void
 arxescsi_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
 		    fasdmadir_t direction, int transfer)
 {
 	struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
 	unsigned int length, error = 0;
 	void __iomem *base = info->info.scsi.io_base;
 	unsigned char *addr;

 	length = SCp->this_residual;
 	addr = SCp->ptr;

 	if (direction == DMA_OUT) {
 		unsigned int word;
 		while (length > 256) {
 			if (readb(base + 0x80) & STAT_INT) {
 				error = 1;
 				break;
 			}
 			arxescsi_pseudo_dma_write(addr, base);
 			addr += 256;
 			length -= 256;
 		}

 		if (!error)
 			while (length > 0) {
 				if (readb(base + 0x80) & STAT_INT)
 					break;

 				if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
 					continue;

 				word = *addr | *(addr + 1) << 8;

 				writew(word, base + DMADATA_OFFSET);
 				if (length > 1) {
 					addr += 2;
 					length -= 2;
 				} else {
 					addr += 1;
 					length -= 1;
 				}
 			}
 	}
 	else {
 		if (transfer && (transfer & 255)) {
 			while (length >= 256) {
 				if (readb(base + 0x80) & STAT_INT) {
 					error = 1;
 					break;
 				}

 				if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
 					continue;

 				readsw(base + DMADATA_OFFSET, addr, 256 >> 1);
 				addr += 256;
 				length -= 256;
 			}
 		}

 		if (!(error))
 			while (length > 0) {
 				unsigned long word;

 				if (readb(base + 0x80) & STAT_INT)
 					break;

 				if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
 					continue;

 				word = readw(base + DMADATA_OFFSET);
 				*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, struct scsi_pointer *SCp)
 {
 	/*
 	 * no DMA to stop
 	 */
 }

 /*
  * 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.
  */
 static const char *arxescsi_info(struct Scsi_Host *host)
 {
 	struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
 	static char string[150];

 	sprintf(string, "%s (%s) in slot %d v%s",
 		host->hostt->name, info->info.scsi.type, info->ec->slot_no,
 		VERSION);

 	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 up to.
  *	     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.
  */
 static int
 arxescsi_proc_info(struct Scsi_Host *host, char *buffer, char **start, off_t offset, int length,
 		   int inout)
 {
 	struct arxescsi_info *info;
 	char *p = buffer;
 	int pos;

 	info = (struct arxescsi_info *)host->hostdata;
 	if (inout == 1)
 		return -EINVAL;

 	p += sprintf(p, "ARXE 16-bit SCSI driver v%s\n", VERSION);
 	p += fas216_print_host(&info->info, p);
 	p += fas216_print_stats(&info->info, p);
 	p += fas216_print_devices(&info->info, p);

 	*start = buffer + offset;
 	pos = p - buffer - offset;
 	if (pos > length)
 		pos = length;

 	return pos;
 }

 static struct scsi_host_template arxescsi_template = {
 	.proc_info			= arxescsi_proc_info,
 	.name				= "ARXE SCSI card",
 	.info				= arxescsi_info,
 	.queuecommand			= fas216_noqueue_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			= 0,
 	.this_id			= 7,
 	.sg_tablesize			= SG_ALL,
 	.cmd_per_lun			= 1,
 	.use_clustering			= DISABLE_CLUSTERING,
 	.proc_name			= "arxescsi",
 };

 static int __devinit
 arxescsi_probe(struct expansion_card *ec, const struct ecard_id *id)
 {
 	struct Scsi_Host *host;
 	struct arxescsi_info *info;
 	void __iomem *base;
 	int ret;

 	ret = ecard_request_resources(ec);
 	if (ret)
 		goto out;

 	base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
 	if (!base) {
 		ret = -ENOMEM;
 		goto out_region;
 	}

 	host = scsi_host_alloc(&arxescsi_template, sizeof(struct arxescsi_info));
 	if (!host) {
 		ret = -ENOMEM;
 		goto out_region;
 	}

 	info = (struct arxescsi_info *)host->hostdata;
 	info->ec = ec;
 	info->base = base;

 	info->info.scsi.io_base		= base + 0x2000;
 	info->info.scsi.irq		= 0;
 	info->info.scsi.dma		= NO_DMA;
 	info->info.scsi.io_shift	= 5;
 	info->info.ifcfg.clockrate	= 24; /* MHz */
 	info->info.ifcfg.select_timeout = 255;
 	info->info.ifcfg.asyncperiod	= 200; /* ns */
 	info->info.ifcfg.sync_max_depth	= 0;
 	info->info.ifcfg.cntl3		= CNTL3_FASTSCSI | CNTL3_FASTCLK;
 	info->info.ifcfg.disconnect_ok	= 0;
 	info->info.ifcfg.wide_max_size	= 0;
 	info->info.ifcfg.capabilities	= FASCAP_PSEUDODMA;
 	info->info.dma.setup		= arxescsi_dma_setup;
 	info->info.dma.pseudo		= arxescsi_dma_pseudo;
 	info->info.dma.stop		= arxescsi_dma_stop;

 	ec->irqaddr = base;
 	ec->irqmask = CSTATUS_IRQ;

 	ret = fas216_init(host);
 	if (ret)
 		goto out_unregister;

 	ret = fas216_add(host, &ec->dev);
 	if (ret == 0)
 		goto out;

 	fas216_release(host);
  out_unregister:
 	scsi_host_put(host);
  out_region:
 	ecard_release_resources(ec);
  out:
 	return ret;
 }

 static void __devexit arxescsi_remove(struct expansion_card *ec)
 {
 	struct Scsi_Host *host = ecard_get_drvdata(ec);

 	ecard_set_drvdata(ec, NULL);
 	fas216_remove(host);

 	fas216_release(host);
 	scsi_host_put(host);
 	ecard_release_resources(ec);
 }

 static const struct ecard_id arxescsi_cids[] = {
 	{ MANU_ARXE, PROD_ARXE_SCSI },
 	{ 0xffff, 0xffff },
 };

 static struct ecard_driver arxescsi_driver = {
 	.probe		= arxescsi_probe,
 	.remove		= __devexit_p(arxescsi_remove),
 	.id_table	= arxescsi_cids,
 	.drv = {
 		.name		= "arxescsi",
 	},
 };

 static int __init init_arxe_scsi_driver(void)
 {
 	return ecard_register_driver(&arxescsi_driver);
 }

 static void __exit exit_arxe_scsi_driver(void)
 {
 	ecard_remove_driver(&arxescsi_driver);
 }

 module_init(init_arxe_scsi_driver);
 module_exit(exit_arxe_scsi_driver);

 MODULE_AUTHOR("Stefan Hanske");
 MODULE_DESCRIPTION("ARXESCSI driver for Acorn machines");
 MODULE_LICENSE("GPL");
	/*
	* linux/drivers/scsi/arm/arxescsi.c
	*
	* Copyright (C) 1997-2000 Russell King, Stefan Hanske
	*
	* 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 SH 0.0.2 Changed to support ARXE 16-bit SCSI card
	* enabled writing
	* 01-01-2000 SH 0.1.0 Added real pseudo dma writing
	* (arxescsi_pseudo_dma_write)
	* 02-04-2000 RMK 0.1.1 Updated for new error handling code.
	* 22-10-2000 SH Updated for new registering scheme.
	*/
	#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/unistd.h>
	#include <linux/stat.h>
	#include <linux/delay.h>
	#include <linux/init.h>
	#include <linux/interrupt.h>

	#include <asm/dma.h>
	#include <asm/io.h>
	#include <asm/ecard.h>

	#include "../scsi.h"
	#include <scsi/scsi_host.h>
	#include "fas216.h"

	struct arxescsi_info {
	FAS216_Info info;
	struct expansion_card *ec;
	void __iomem *base;
	};

	#define DMADATA_OFFSET (0x200)

	#define DMASTAT_OFFSET (0x600)
	#define DMASTAT_DRQ (1 << 0)

	#define CSTATUS_IRQ (1 << 0)

	#define VERSION "1.10 (23/01/2003 2.5.57)"

	/*
	* 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, struct scsi_pointer SCp,
	fasdmadir_t direction, fasdmatype_t min_type)
	{
	/*
	* We don't do real DMA
	*/
	return fasdma_pseudo;
	}

	static void arxescsi_pseudo_dma_write(unsigned char addr, void __iomem base)
	{
	__asm__ __volatile__(
	" stmdb sp!, {r0-r12}\n"
	" mov r3, %0\n"
	" mov r1, %1\n"
	" add r2, r1, #512\n"
	" mov r4, #256\n"
	".loop_1: ldmia r3!, {r6, r8, r10, r12}\n"
	" mov r5, r6, lsl #16\n"
	" mov r7, r8, lsl #16\n"
	".loop_2: ldrb r0, [r1, #1536]\n"
	" tst r0, #1\n"
	" beq .loop_2\n"
	" stmia r2, {r5-r8}\n\t"
	" mov r9, r10, lsl #16\n"
	" mov r11, r12, lsl #16\n"
	".loop_3: ldrb r0, [r1, #1536]\n"
	" tst r0, #1\n"
	" beq .loop_3\n"
	" stmia r2, {r9-r12}\n"
	" subs r4, r4, #16\n"
	" bne .loop_1\n"
	" ldmia sp!, {r0-r12}\n"
	:
	: "r" (addr), "r" (base));
	}

	/*
	* 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
	*/
	static void
	arxescsi_dma_pseudo(struct Scsi_Host host, struct scsi_pointer SCp,
	fasdmadir_t direction, int transfer)
	{
	struct arxescsi_info info = (struct arxescsi_info )host->hostdata;
	unsigned int length, error = 0;
	void __iomem *base = info->info.scsi.io_base;
	unsigned char *addr;

	length = SCp->this_residual;
	addr = SCp->ptr;

	if (direction == DMA_OUT) {
	unsigned int word;
	while (length > 256) {
	if (readb(base + 0x80) & STAT_INT) {
	error = 1;
	break;
	}
	arxescsi_pseudo_dma_write(addr, base);
	addr += 256;
	length -= 256;
	}

	if (!error)
	while (length > 0) {
	if (readb(base + 0x80) & STAT_INT)
	break;

	if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
	continue;

	word = addr \| (addr + 1) << 8;

	writew(word, base + DMADATA_OFFSET);
	if (length > 1) {
	addr += 2;
	length -= 2;
	} else {
	addr += 1;
	length -= 1;
	}
	}
	}
	else {
	if (transfer && (transfer & 255)) {
	while (length >= 256) {
	if (readb(base + 0x80) & STAT_INT) {
	error = 1;
	break;
	}

	if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
	continue;

	readsw(base + DMADATA_OFFSET, addr, 256 >> 1);
	addr += 256;
	length -= 256;
	}
	}

	if (!(error))
	while (length > 0) {
	unsigned long word;

	if (readb(base + 0x80) & STAT_INT)
	break;

	if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
	continue;

	word = readw(base + DMADATA_OFFSET);
	*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, struct scsi_pointer SCp)
	{
	/*
	* no DMA to stop
	*/
	}

	/*
	* 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.
	*/
	static const char arxescsi_info(struct Scsi_Host host)
	{
	struct arxescsi_info info = (struct arxescsi_info )host->hostdata;
	static char string[150];

	sprintf(string, "%s (%s) in slot %d v%s",
	host->hostt->name, info->info.scsi.type, info->ec->slot_no,
	VERSION);

	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 up to.
	* 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.
	*/
	static int
	arxescsi_proc_info(struct Scsi_Host host, char buffer, char **start, off_t offset, int length,
	int inout)
	{
	struct arxescsi_info *info;
	char *p = buffer;
	int pos;

	info = (struct arxescsi_info *)host->hostdata;
	if (inout == 1)
	return -EINVAL;

	p += sprintf(p, "ARXE 16-bit SCSI driver v%s\n", VERSION);
	p += fas216_print_host(&info->info, p);
	p += fas216_print_stats(&info->info, p);
	p += fas216_print_devices(&info->info, p);

	*start = buffer + offset;
	pos = p - buffer - offset;
	if (pos > length)
	pos = length;

	return pos;
	}

	static struct scsi_host_template arxescsi_template = {
	.proc_info = arxescsi_proc_info,
	.name = "ARXE SCSI card",
	.info = arxescsi_info,
	.queuecommand = fas216_noqueue_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 = 0,
	.this_id = 7,
	.sg_tablesize = SG_ALL,
	.cmd_per_lun = 1,
	.use_clustering = DISABLE_CLUSTERING,
	.proc_name = "arxescsi",
	};

	static int __devinit
	arxescsi_probe(struct expansion_card ec, const struct ecard_id id)
	{
	struct Scsi_Host *host;
	struct arxescsi_info *info;
	void __iomem *base;
	int ret;

	ret = ecard_request_resources(ec);
	if (ret)
	goto out;

	base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
	if (!base) {
	ret = -ENOMEM;
	goto out_region;
	}

	host = scsi_host_alloc(&arxescsi_template, sizeof(struct arxescsi_info));
	if (!host) {
	ret = -ENOMEM;
	goto out_region;
	}

	info = (struct arxescsi_info *)host->hostdata;
	info->ec = ec;
	info->base = base;

	info->info.scsi.io_base = base + 0x2000;
	info->info.scsi.irq = 0;
	info->info.scsi.dma = NO_DMA;
	info->info.scsi.io_shift = 5;
	info->info.ifcfg.clockrate = 24; /* MHz */
	info->info.ifcfg.select_timeout = 255;
	info->info.ifcfg.asyncperiod = 200; /* ns */
	info->info.ifcfg.sync_max_depth = 0;
	info->info.ifcfg.cntl3 = CNTL3_FASTSCSI \| CNTL3_FASTCLK;
	info->info.ifcfg.disconnect_ok = 0;
	info->info.ifcfg.wide_max_size = 0;
	info->info.ifcfg.capabilities = FASCAP_PSEUDODMA;
	info->info.dma.setup = arxescsi_dma_setup;
	info->info.dma.pseudo = arxescsi_dma_pseudo;
	info->info.dma.stop = arxescsi_dma_stop;

	ec->irqaddr = base;
	ec->irqmask = CSTATUS_IRQ;

	ret = fas216_init(host);
	if (ret)
	goto out_unregister;

	ret = fas216_add(host, &ec->dev);
	if (ret == 0)
	goto out;

	fas216_release(host);
	out_unregister:
	scsi_host_put(host);
	out_region:
	ecard_release_resources(ec);
	out:
	return ret;
	}

	static void __devexit arxescsi_remove(struct expansion_card *ec)
	{
	struct Scsi_Host *host = ecard_get_drvdata(ec);

	ecard_set_drvdata(ec, NULL);
	fas216_remove(host);

	fas216_release(host);
	scsi_host_put(host);
	ecard_release_resources(ec);
	}

	static const struct ecard_id arxescsi_cids[] = {
	{ MANU_ARXE, PROD_ARXE_SCSI },
	{ 0xffff, 0xffff },
	};

	static struct ecard_driver arxescsi_driver = {
	.probe = arxescsi_probe,
	.remove = __devexit_p(arxescsi_remove),
	.id_table = arxescsi_cids,
	.drv = {
	.name = "arxescsi",
	},
	};

	static int __init init_arxe_scsi_driver(void)
	{
	return ecard_register_driver(&arxescsi_driver);
	}

	static void __exit exit_arxe_scsi_driver(void)
	{
	ecard_remove_driver(&arxescsi_driver);
	}

	module_init(init_arxe_scsi_driver);
	module_exit(exit_arxe_scsi_driver);

	MODULE_AUTHOR("Stefan Hanske");
	MODULE_DESCRIPTION("ARXESCSI driver for Acorn machines");
	MODULE_LICENSE("GPL");