drivers/scsi/mac_scsi.c - kernel/bruno - Git at Google

 /*
  * Generic Macintosh NCR5380 driver
  *
  * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
  *
  * derived in part from:
  */
 /*
  * Generic Generic NCR5380 driver
  *
  * Copyright 1995, Russell King
  */

 #include <linux/types.h>
 #include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/ioport.h>
 #include <linux/init.h>
 #include <linux/blkdev.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>

 #include <asm/hwtest.h>
 #include <asm/io.h>
 #include <asm/macints.h>
 #include <asm/setup.h>

 #include <scsi/scsi_host.h>

 /* Definitions for the core NCR5380 driver. */

 #define PSEUDO_DMA

 #define NCR5380_implementation_fields   unsigned char *pdma_base
 #define NCR5380_local_declare()         struct Scsi_Host *_instance
 #define NCR5380_setup(instance)         _instance = instance

 #define NCR5380_read(reg)               macscsi_read(_instance, reg)
 #define NCR5380_write(reg, value)       macscsi_write(_instance, reg, value)

 #define NCR5380_pread                   macscsi_pread
 #define NCR5380_pwrite                  macscsi_pwrite

 #define NCR5380_intr                    macscsi_intr
 #define NCR5380_queue_command           macscsi_queue_command
 #define NCR5380_abort                   macscsi_abort
 #define NCR5380_bus_reset               macscsi_bus_reset
 #define NCR5380_info                    macscsi_info
 #define NCR5380_show_info               macscsi_show_info
 #define NCR5380_write_info              macscsi_write_info

 #include "NCR5380.h"

 #define RESET_BOOT

 static int setup_can_queue = -1;
 module_param(setup_can_queue, int, 0);
 static int setup_cmd_per_lun = -1;
 module_param(setup_cmd_per_lun, int, 0);
 static int setup_sg_tablesize = -1;
 module_param(setup_sg_tablesize, int, 0);
 static int setup_use_pdma = -1;
 module_param(setup_use_pdma, int, 0);
 static int setup_use_tagged_queuing = -1;
 module_param(setup_use_tagged_queuing, int, 0);
 static int setup_hostid = -1;
 module_param(setup_hostid, int, 0);

 /* Time (in jiffies) to wait after a reset; the SCSI standard calls for 250ms,
  * we usually do 0.5s to be on the safe side. But Toshiba CD-ROMs once more
  * need ten times the standard value... */
 #define TOSHIBA_DELAY

 #ifdef TOSHIBA_DELAY
 #define	AFTER_RESET_DELAY	(5*HZ/2)
 #else
 #define	AFTER_RESET_DELAY	(HZ/2)
 #endif

 /*
  * NCR 5380 register access functions
  */

 static inline char macscsi_read(struct Scsi_Host *instance, int reg)
 {
 	return in_8(instance->base + (reg << 4));
 }

 static inline void macscsi_write(struct Scsi_Host *instance, int reg, int value)
 {
 	out_8(instance->base + (reg << 4), value);
 }

 #ifndef MODULE
 static int __init mac_scsi_setup(char *str)
 {
 	int ints[7];

 	(void)get_options(str, ARRAY_SIZE(ints), ints);

 	if (ints[0] < 1 || ints[0] > 6) {
 		pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>]]]]]\n");
 		return 0;
 	}
 	if (ints[0] >= 1)
 		setup_can_queue = ints[1];
 	if (ints[0] >= 2)
 		setup_cmd_per_lun = ints[2];
 	if (ints[0] >= 3)
 		setup_sg_tablesize = ints[3];
 	if (ints[0] >= 4)
 		setup_hostid = ints[4];
 	if (ints[0] >= 5)
 		setup_use_tagged_queuing = ints[5];
 	if (ints[0] >= 6)
 		setup_use_pdma = ints[6];
 	return 1;
 }

 __setup("mac5380=", mac_scsi_setup);
 #endif /* !MODULE */

 #ifdef RESET_BOOT
 /*
  * Our 'bus reset on boot' function
  */

 static void mac_scsi_reset_boot(struct Scsi_Host *instance)
 {
 	unsigned long end;

 	NCR5380_local_declare();
 	NCR5380_setup(instance);

 	/*
 	 * Do a SCSI reset to clean up the bus during initialization. No messing
 	 * with the queues, interrupts, or locks necessary here.
 	 */

 	printk(KERN_INFO "Macintosh SCSI: resetting the SCSI bus..." );

 	/* get in phase */
 	NCR5380_write( TARGET_COMMAND_REG,
 		      PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));

 	/* assert RST */
 	NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
 	/* The min. reset hold time is 25us, so 40us should be enough */
 	udelay( 50 );
 	/* reset RST and interrupt */
 	NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
 	NCR5380_read( RESET_PARITY_INTERRUPT_REG );

 	for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
 		barrier();

 	printk(KERN_INFO " done\n" );
 }
 #endif

 #ifdef PSEUDO_DMA
 /*
    Pseudo-DMA: (Ove Edlund)
    The code attempts to catch bus errors that occur if one for example
    "trips over the cable".
    XXX: Since bus errors in the PDMA routines never happen on my
    computer, the bus error code is untested.
    If the code works as intended, a bus error results in Pseudo-DMA
    being disabled, meaning that the driver switches to slow handshake.
    If bus errors are NOT extremely rare, this has to be changed.
 */

 #define CP_IO_TO_MEM(s,d,len)				\
 __asm__ __volatile__					\
     ("    cmp.w  #4,%2\n"				\
      "    bls    8f\n"					\
      "    move.w %1,%%d0\n"				\
      "    neg.b  %%d0\n"				\
      "    and.w  #3,%%d0\n"				\
      "    sub.w  %%d0,%2\n"				\
      "    bra    2f\n"					\
      " 1: move.b (%0),(%1)+\n"				\
      " 2: dbf    %%d0,1b\n"				\
      "    move.w %2,%%d0\n"				\
      "    lsr.w  #5,%%d0\n"				\
      "    bra    4f\n"					\
      " 3: move.l (%0),(%1)+\n"				\
      "31: move.l (%0),(%1)+\n"				\
      "32: move.l (%0),(%1)+\n"				\
      "33: move.l (%0),(%1)+\n"				\
      "34: move.l (%0),(%1)+\n"				\
      "35: move.l (%0),(%1)+\n"				\
      "36: move.l (%0),(%1)+\n"				\
      "37: move.l (%0),(%1)+\n"				\
      " 4: dbf    %%d0,3b\n"				\
      "    move.w %2,%%d0\n"				\
      "    lsr.w  #2,%%d0\n"				\
      "    and.w  #7,%%d0\n"				\
      "    bra    6f\n"					\
      " 5: move.l (%0),(%1)+\n"				\
      " 6: dbf    %%d0,5b\n"				\
      "    and.w  #3,%2\n"				\
      "    bra    8f\n"					\
      " 7: move.b (%0),(%1)+\n"				\
      " 8: dbf    %2,7b\n"				\
      "    moveq.l #0, %2\n"				\
      " 9: \n"						\
      ".section .fixup,\"ax\"\n"				\
      "    .even\n"					\
      "90: moveq.l #1, %2\n"				\
      "    jra 9b\n"					\
      ".previous\n"					\
      ".section __ex_table,\"a\"\n"			\
      "   .align 4\n"					\
      "   .long  1b,90b\n"				\
      "   .long  3b,90b\n"				\
      "   .long 31b,90b\n"				\
      "   .long 32b,90b\n"				\
      "   .long 33b,90b\n"				\
      "   .long 34b,90b\n"				\
      "   .long 35b,90b\n"				\
      "   .long 36b,90b\n"				\
      "   .long 37b,90b\n"				\
      "   .long  5b,90b\n"				\
      "   .long  7b,90b\n"				\
      ".previous"					\
      : "=a"(s), "=a"(d), "=d"(len)			\
      : "0"(s), "1"(d), "2"(len)				\
      : "d0")

 static int macscsi_pread(struct Scsi_Host *instance,
                          unsigned char *dst, int len)
 {
 	struct NCR5380_hostdata *hostdata = shost_priv(instance);
 	unsigned char *d;
 	unsigned char *s;

 	NCR5380_local_declare();
 	NCR5380_setup(instance);

 	s = hostdata->pdma_base + (INPUT_DATA_REG << 4);
 	d = dst;

 	/* These conditions are derived from MacOS */

 	while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) &&
 	       !(NCR5380_read(STATUS_REG) & SR_REQ))
 		;

 	if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) &&
 	    (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) {
 		pr_err("Error in macscsi_pread\n");
 		return -1;
 	}

 	CP_IO_TO_MEM(s, d, len);

 	if (len != 0) {
 		pr_notice("Bus error in macscsi_pread\n");
 		return -1;
 	}

 	return 0;
 }


 #define CP_MEM_TO_IO(s,d,len)				\
 __asm__ __volatile__					\
     ("    cmp.w  #4,%2\n"				\
      "    bls    8f\n"					\
      "    move.w %0,%%d0\n"				\
      "    neg.b  %%d0\n"				\
      "    and.w  #3,%%d0\n"				\
      "    sub.w  %%d0,%2\n"				\
      "    bra    2f\n"					\
      " 1: move.b (%0)+,(%1)\n"				\
      " 2: dbf    %%d0,1b\n"				\
      "    move.w %2,%%d0\n"				\
      "    lsr.w  #5,%%d0\n"				\
      "    bra    4f\n"					\
      " 3: move.l (%0)+,(%1)\n"				\
      "31: move.l (%0)+,(%1)\n"				\
      "32: move.l (%0)+,(%1)\n"				\
      "33: move.l (%0)+,(%1)\n"				\
      "34: move.l (%0)+,(%1)\n"				\
      "35: move.l (%0)+,(%1)\n"				\
      "36: move.l (%0)+,(%1)\n"				\
      "37: move.l (%0)+,(%1)\n"				\
      " 4: dbf    %%d0,3b\n"				\
      "    move.w %2,%%d0\n"				\
      "    lsr.w  #2,%%d0\n"				\
      "    and.w  #7,%%d0\n"				\
      "    bra    6f\n"					\
      " 5: move.l (%0)+,(%1)\n"				\
      " 6: dbf    %%d0,5b\n"				\
      "    and.w  #3,%2\n"				\
      "    bra    8f\n"					\
      " 7: move.b (%0)+,(%1)\n"				\
      " 8: dbf    %2,7b\n"				\
      "    moveq.l #0, %2\n"				\
      " 9: \n"						\
      ".section .fixup,\"ax\"\n"				\
      "    .even\n"					\
      "90: moveq.l #1, %2\n"				\
      "    jra 9b\n"					\
      ".previous\n"					\
      ".section __ex_table,\"a\"\n"			\
      "   .align 4\n"					\
      "   .long  1b,90b\n"				\
      "   .long  3b,90b\n"				\
      "   .long 31b,90b\n"				\
      "   .long 32b,90b\n"				\
      "   .long 33b,90b\n"				\
      "   .long 34b,90b\n"				\
      "   .long 35b,90b\n"				\
      "   .long 36b,90b\n"				\
      "   .long 37b,90b\n"				\
      "   .long  5b,90b\n"				\
      "   .long  7b,90b\n"				\
      ".previous"					\
      : "=a"(s), "=a"(d), "=d"(len)			\
      : "0"(s), "1"(d), "2"(len)				\
      : "d0")

 static int macscsi_pwrite(struct Scsi_Host *instance,
                           unsigned char *src, int len)
 {
 	struct NCR5380_hostdata *hostdata = shost_priv(instance);
 	unsigned char *s;
 	unsigned char *d;

 	NCR5380_local_declare();
 	NCR5380_setup(instance);

 	s = src;
 	d = hostdata->pdma_base + (OUTPUT_DATA_REG << 4);

 	/* These conditions are derived from MacOS */

 	while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) &&
 	       (!(NCR5380_read(STATUS_REG) & SR_REQ) ||
 	        (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)))
 		;

 	if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)) {
 		pr_err("Error in macscsi_pwrite\n");
 		return -1;
 	}

 	CP_MEM_TO_IO(s, d, len);

 	if (len != 0) {
 		pr_notice("Bus error in macscsi_pwrite\n");
 		return -1;
 	}

 	return 0;
 }
 #endif

 #include "NCR5380.c"

 #define DRV_MODULE_NAME         "mac_scsi"
 #define PFX                     DRV_MODULE_NAME ": "

 static struct scsi_host_template mac_scsi_template = {
 	.module				= THIS_MODULE,
 	.proc_name			= DRV_MODULE_NAME,
 	.show_info			= macscsi_show_info,
 	.write_info			= macscsi_write_info,
 	.name				= "Macintosh NCR5380 SCSI",
 	.info				= macscsi_info,
 	.queuecommand			= macscsi_queue_command,
 	.eh_abort_handler		= macscsi_abort,
 	.eh_bus_reset_handler		= macscsi_bus_reset,
 	.can_queue			= 16,
 	.this_id			= 7,
 	.sg_tablesize			= SG_ALL,
 	.cmd_per_lun			= 2,
 	.use_clustering			= DISABLE_CLUSTERING
 };

 static int __init mac_scsi_probe(struct platform_device *pdev)
 {
 	struct Scsi_Host *instance;
 	int error;
 	int host_flags = 0;
 	struct resource *irq, *pio_mem, *pdma_mem = NULL;

 	pio_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!pio_mem)
 		return -ENODEV;

 #ifdef PSEUDO_DMA
 	pdma_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 #endif

 	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);

 	if (!hwreg_present((unsigned char *)pio_mem->start +
 	                   (STATUS_REG << 4))) {
 		pr_info(PFX "no device detected at %pap\n", &pio_mem->start);
 		return -ENODEV;
 	}

 	if (setup_can_queue > 0)
 		mac_scsi_template.can_queue = setup_can_queue;
 	if (setup_cmd_per_lun > 0)
 		mac_scsi_template.cmd_per_lun = setup_cmd_per_lun;
 	if (setup_sg_tablesize >= 0)
 		mac_scsi_template.sg_tablesize = setup_sg_tablesize;
 	if (setup_hostid >= 0)
 		mac_scsi_template.this_id = setup_hostid & 7;
 	if (setup_use_pdma < 0)
 		setup_use_pdma = 0;

 	instance = scsi_host_alloc(&mac_scsi_template,
 	                           sizeof(struct NCR5380_hostdata));
 	if (!instance)
 		return -ENOMEM;

 	instance->base = pio_mem->start;
 	if (irq)
 		instance->irq = irq->start;
 	else
 		instance->irq = NO_IRQ;

 	if (pdma_mem && setup_use_pdma) {
 		struct NCR5380_hostdata *hostdata = shost_priv(instance);

 		hostdata->pdma_base = (unsigned char *)pdma_mem->start;
 	} else
 		host_flags |= FLAG_NO_PSEUDO_DMA;

 #ifdef RESET_BOOT
 	mac_scsi_reset_boot(instance);
 #endif

 #ifdef SUPPORT_TAGS
 	host_flags |= setup_use_tagged_queuing > 0 ? FLAG_TAGGED_QUEUING : 0;
 #endif

 	NCR5380_init(instance, host_flags);

 	if (instance->irq != NO_IRQ) {
 		error = request_irq(instance->irq, macscsi_intr, IRQF_SHARED,
 		                    "NCR5380", instance);
 		if (error)
 			goto fail_irq;
 	}

 	error = scsi_add_host(instance, NULL);
 	if (error)
 		goto fail_host;

 	platform_set_drvdata(pdev, instance);

 	scsi_scan_host(instance);
 	return 0;

 fail_host:
 	if (instance->irq != NO_IRQ)
 		free_irq(instance->irq, instance);
 fail_irq:
 	NCR5380_exit(instance);
 	scsi_host_put(instance);
 	return error;
 }

 static int __exit mac_scsi_remove(struct platform_device *pdev)
 {
 	struct Scsi_Host *instance = platform_get_drvdata(pdev);

 	scsi_remove_host(instance);
 	if (instance->irq != NO_IRQ)
 		free_irq(instance->irq, instance);
 	NCR5380_exit(instance);
 	scsi_host_put(instance);
 	return 0;
 }

 static struct platform_driver mac_scsi_driver = {
 	.remove = __exit_p(mac_scsi_remove),
 	.driver = {
 		.name	= DRV_MODULE_NAME,
 	},
 };

 module_platform_driver_probe(mac_scsi_driver, mac_scsi_probe);

 MODULE_ALIAS("platform:" DRV_MODULE_NAME);
 MODULE_LICENSE("GPL");
	/*
	* Generic Macintosh NCR5380 driver
	*
	* Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
	*
	* derived in part from:
	*/
	/*
	* Generic Generic NCR5380 driver
	*
	* Copyright 1995, Russell King
	*/

	#include <linux/types.h>
	#include <linux/delay.h>
	#include <linux/module.h>
	#include <linux/ioport.h>
	#include <linux/init.h>
	#include <linux/blkdev.h>
	#include <linux/interrupt.h>
	#include <linux/platform_device.h>

	#include <asm/hwtest.h>
	#include <asm/io.h>
	#include <asm/macints.h>
	#include <asm/setup.h>

	#include <scsi/scsi_host.h>

	/* Definitions for the core NCR5380 driver. */

	#define PSEUDO_DMA

	#define NCR5380_implementation_fields unsigned char *pdma_base
	#define NCR5380_local_declare() struct Scsi_Host *_instance
	#define NCR5380_setup(instance) _instance = instance

	#define NCR5380_read(reg) macscsi_read(_instance, reg)
	#define NCR5380_write(reg, value) macscsi_write(_instance, reg, value)

	#define NCR5380_pread macscsi_pread
	#define NCR5380_pwrite macscsi_pwrite

	#define NCR5380_intr macscsi_intr
	#define NCR5380_queue_command macscsi_queue_command
	#define NCR5380_abort macscsi_abort
	#define NCR5380_bus_reset macscsi_bus_reset
	#define NCR5380_info macscsi_info
	#define NCR5380_show_info macscsi_show_info
	#define NCR5380_write_info macscsi_write_info

	#include "NCR5380.h"

	#define RESET_BOOT

	static int setup_can_queue = -1;
	module_param(setup_can_queue, int, 0);
	static int setup_cmd_per_lun = -1;
	module_param(setup_cmd_per_lun, int, 0);
	static int setup_sg_tablesize = -1;
	module_param(setup_sg_tablesize, int, 0);
	static int setup_use_pdma = -1;
	module_param(setup_use_pdma, int, 0);
	static int setup_use_tagged_queuing = -1;
	module_param(setup_use_tagged_queuing, int, 0);
	static int setup_hostid = -1;
	module_param(setup_hostid, int, 0);

	/* Time (in jiffies) to wait after a reset; the SCSI standard calls for 250ms,
	* we usually do 0.5s to be on the safe side. But Toshiba CD-ROMs once more
	* need ten times the standard value... */
	#define TOSHIBA_DELAY

	#ifdef TOSHIBA_DELAY
	#define AFTER_RESET_DELAY (5*HZ/2)
	#else
	#define AFTER_RESET_DELAY (HZ/2)
	#endif

	/*
	* NCR 5380 register access functions
	*/

	static inline char macscsi_read(struct Scsi_Host *instance, int reg)
	{
	return in_8(instance->base + (reg << 4));
	}

	static inline void macscsi_write(struct Scsi_Host *instance, int reg, int value)
	{
	out_8(instance->base + (reg << 4), value);
	}

	#ifndef MODULE
	static int __init mac_scsi_setup(char *str)
	{
	int ints[7];

	(void)get_options(str, ARRAY_SIZE(ints), ints);

	if (ints[0] < 1 \|\| ints[0] > 6) {
	pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>]]]]]\n");
	return 0;
	}
	if (ints[0] >= 1)
	setup_can_queue = ints[1];
	if (ints[0] >= 2)
	setup_cmd_per_lun = ints[2];
	if (ints[0] >= 3)
	setup_sg_tablesize = ints[3];
	if (ints[0] >= 4)
	setup_hostid = ints[4];
	if (ints[0] >= 5)
	setup_use_tagged_queuing = ints[5];
	if (ints[0] >= 6)
	setup_use_pdma = ints[6];
	return 1;
	}

	__setup("mac5380=", mac_scsi_setup);
	#endif /* !MODULE */

	#ifdef RESET_BOOT
	/*
	* Our 'bus reset on boot' function
	*/

	static void mac_scsi_reset_boot(struct Scsi_Host *instance)
	{
	unsigned long end;

	NCR5380_local_declare();
	NCR5380_setup(instance);

	/*
	* Do a SCSI reset to clean up the bus during initialization. No messing
	* with the queues, interrupts, or locks necessary here.
	*/

	printk(KERN_INFO "Macintosh SCSI: resetting the SCSI bus..." );

	/* get in phase */
	NCR5380_write( TARGET_COMMAND_REG,
	PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));

	/* assert RST */
	NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE \| ICR_ASSERT_RST );
	/* The min. reset hold time is 25us, so 40us should be enough */
	udelay( 50 );
	/* reset RST and interrupt */
	NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
	NCR5380_read( RESET_PARITY_INTERRUPT_REG );

	for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
	barrier();

	printk(KERN_INFO " done\n" );
	}
	#endif

	#ifdef PSEUDO_DMA
	/*
	Pseudo-DMA: (Ove Edlund)
	The code attempts to catch bus errors that occur if one for example
	"trips over the cable".
	XXX: Since bus errors in the PDMA routines never happen on my
	computer, the bus error code is untested.
	If the code works as intended, a bus error results in Pseudo-DMA
	being disabled, meaning that the driver switches to slow handshake.
	If bus errors are NOT extremely rare, this has to be changed.
	*/

	#define CP_IO_TO_MEM(s,d,len) \
	__asm__ __volatile__ \
	(" cmp.w #4,%2\n" \
	" bls 8f\n" \
	" move.w %1,%%d0\n" \
	" neg.b %%d0\n" \
	" and.w #3,%%d0\n" \
	" sub.w %%d0,%2\n" \
	" bra 2f\n" \
	" 1: move.b (%0),(%1)+\n" \
	" 2: dbf %%d0,1b\n" \
	" move.w %2,%%d0\n" \
	" lsr.w #5,%%d0\n" \
	" bra 4f\n" \
	" 3: move.l (%0),(%1)+\n" \
	"31: move.l (%0),(%1)+\n" \
	"32: move.l (%0),(%1)+\n" \
	"33: move.l (%0),(%1)+\n" \
	"34: move.l (%0),(%1)+\n" \
	"35: move.l (%0),(%1)+\n" \
	"36: move.l (%0),(%1)+\n" \
	"37: move.l (%0),(%1)+\n" \
	" 4: dbf %%d0,3b\n" \
	" move.w %2,%%d0\n" \
	" lsr.w #2,%%d0\n" \
	" and.w #7,%%d0\n" \
	" bra 6f\n" \
	" 5: move.l (%0),(%1)+\n" \
	" 6: dbf %%d0,5b\n" \
	" and.w #3,%2\n" \
	" bra 8f\n" \
	" 7: move.b (%0),(%1)+\n" \
	" 8: dbf %2,7b\n" \
	" moveq.l #0, %2\n" \
	" 9: \n" \
	".section .fixup,\"ax\"\n" \
	" .even\n" \
	"90: moveq.l #1, %2\n" \
	" jra 9b\n" \
	".previous\n" \
	".section __ex_table,\"a\"\n" \
	" .align 4\n" \
	" .long 1b,90b\n" \
	" .long 3b,90b\n" \
	" .long 31b,90b\n" \
	" .long 32b,90b\n" \
	" .long 33b,90b\n" \
	" .long 34b,90b\n" \
	" .long 35b,90b\n" \
	" .long 36b,90b\n" \
	" .long 37b,90b\n" \
	" .long 5b,90b\n" \
	" .long 7b,90b\n" \
	".previous" \
	: "=a"(s), "=a"(d), "=d"(len) \
	: "0"(s), "1"(d), "2"(len) \
	: "d0")

	static int macscsi_pread(struct Scsi_Host *instance,
	unsigned char *dst, int len)
	{
	struct NCR5380_hostdata *hostdata = shost_priv(instance);
	unsigned char *d;
	unsigned char *s;

	NCR5380_local_declare();
	NCR5380_setup(instance);

	s = hostdata->pdma_base + (INPUT_DATA_REG << 4);
	d = dst;

	/* These conditions are derived from MacOS */

	while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) &&
	!(NCR5380_read(STATUS_REG) & SR_REQ))
	;

	if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) &&
	(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) {
	pr_err("Error in macscsi_pread\n");
	return -1;
	}

	CP_IO_TO_MEM(s, d, len);

	if (len != 0) {
	pr_notice("Bus error in macscsi_pread\n");
	return -1;
	}

	return 0;
	}


	#define CP_MEM_TO_IO(s,d,len) \
	__asm__ __volatile__ \
	(" cmp.w #4,%2\n" \
	" bls 8f\n" \
	" move.w %0,%%d0\n" \
	" neg.b %%d0\n" \
	" and.w #3,%%d0\n" \
	" sub.w %%d0,%2\n" \
	" bra 2f\n" \
	" 1: move.b (%0)+,(%1)\n" \
	" 2: dbf %%d0,1b\n" \
	" move.w %2,%%d0\n" \
	" lsr.w #5,%%d0\n" \
	" bra 4f\n" \
	" 3: move.l (%0)+,(%1)\n" \
	"31: move.l (%0)+,(%1)\n" \
	"32: move.l (%0)+,(%1)\n" \
	"33: move.l (%0)+,(%1)\n" \
	"34: move.l (%0)+,(%1)\n" \
	"35: move.l (%0)+,(%1)\n" \
	"36: move.l (%0)+,(%1)\n" \
	"37: move.l (%0)+,(%1)\n" \
	" 4: dbf %%d0,3b\n" \
	" move.w %2,%%d0\n" \
	" lsr.w #2,%%d0\n" \
	" and.w #7,%%d0\n" \
	" bra 6f\n" \
	" 5: move.l (%0)+,(%1)\n" \
	" 6: dbf %%d0,5b\n" \
	" and.w #3,%2\n" \
	" bra 8f\n" \
	" 7: move.b (%0)+,(%1)\n" \
	" 8: dbf %2,7b\n" \
	" moveq.l #0, %2\n" \
	" 9: \n" \
	".section .fixup,\"ax\"\n" \
	" .even\n" \
	"90: moveq.l #1, %2\n" \
	" jra 9b\n" \
	".previous\n" \
	".section __ex_table,\"a\"\n" \
	" .align 4\n" \
	" .long 1b,90b\n" \
	" .long 3b,90b\n" \
	" .long 31b,90b\n" \
	" .long 32b,90b\n" \
	" .long 33b,90b\n" \
	" .long 34b,90b\n" \
	" .long 35b,90b\n" \
	" .long 36b,90b\n" \
	" .long 37b,90b\n" \
	" .long 5b,90b\n" \
	" .long 7b,90b\n" \
	".previous" \
	: "=a"(s), "=a"(d), "=d"(len) \
	: "0"(s), "1"(d), "2"(len) \
	: "d0")

	static int macscsi_pwrite(struct Scsi_Host *instance,
	unsigned char *src, int len)
	{
	struct NCR5380_hostdata *hostdata = shost_priv(instance);
	unsigned char *s;
	unsigned char *d;

	NCR5380_local_declare();
	NCR5380_setup(instance);

	s = src;
	d = hostdata->pdma_base + (OUTPUT_DATA_REG << 4);

	/* These conditions are derived from MacOS */

	while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) &&
	(!(NCR5380_read(STATUS_REG) & SR_REQ) \|\|
	(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)))
	;

	if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)) {
	pr_err("Error in macscsi_pwrite\n");
	return -1;
	}

	CP_MEM_TO_IO(s, d, len);

	if (len != 0) {
	pr_notice("Bus error in macscsi_pwrite\n");
	return -1;
	}

	return 0;
	}
	#endif

	#include "NCR5380.c"

	#define DRV_MODULE_NAME "mac_scsi"
	#define PFX DRV_MODULE_NAME ": "

	static struct scsi_host_template mac_scsi_template = {
	.module = THIS_MODULE,
	.proc_name = DRV_MODULE_NAME,
	.show_info = macscsi_show_info,
	.write_info = macscsi_write_info,
	.name = "Macintosh NCR5380 SCSI",
	.info = macscsi_info,
	.queuecommand = macscsi_queue_command,
	.eh_abort_handler = macscsi_abort,
	.eh_bus_reset_handler = macscsi_bus_reset,
	.can_queue = 16,
	.this_id = 7,
	.sg_tablesize = SG_ALL,
	.cmd_per_lun = 2,
	.use_clustering = DISABLE_CLUSTERING
	};

	static int __init mac_scsi_probe(struct platform_device *pdev)
	{
	struct Scsi_Host *instance;
	int error;
	int host_flags = 0;
	struct resource irq, pio_mem, *pdma_mem = NULL;

	pio_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!pio_mem)
	return -ENODEV;

	#ifdef PSEUDO_DMA
	pdma_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	#endif

	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);

	if (!hwreg_present((unsigned char *)pio_mem->start +
	(STATUS_REG << 4))) {
	pr_info(PFX "no device detected at %pap\n", &pio_mem->start);
	return -ENODEV;
	}

	if (setup_can_queue > 0)
	mac_scsi_template.can_queue = setup_can_queue;
	if (setup_cmd_per_lun > 0)
	mac_scsi_template.cmd_per_lun = setup_cmd_per_lun;
	if (setup_sg_tablesize >= 0)
	mac_scsi_template.sg_tablesize = setup_sg_tablesize;
	if (setup_hostid >= 0)
	mac_scsi_template.this_id = setup_hostid & 7;
	if (setup_use_pdma < 0)
	setup_use_pdma = 0;

	instance = scsi_host_alloc(&mac_scsi_template,
	sizeof(struct NCR5380_hostdata));
	if (!instance)
	return -ENOMEM;

	instance->base = pio_mem->start;
	if (irq)
	instance->irq = irq->start;
	else
	instance->irq = NO_IRQ;

	if (pdma_mem && setup_use_pdma) {
	struct NCR5380_hostdata *hostdata = shost_priv(instance);

	hostdata->pdma_base = (unsigned char *)pdma_mem->start;
	} else
	host_flags \|= FLAG_NO_PSEUDO_DMA;

	#ifdef RESET_BOOT
	mac_scsi_reset_boot(instance);
	#endif

	#ifdef SUPPORT_TAGS
	host_flags \|= setup_use_tagged_queuing > 0 ? FLAG_TAGGED_QUEUING : 0;
	#endif

	NCR5380_init(instance, host_flags);

	if (instance->irq != NO_IRQ) {
	error = request_irq(instance->irq, macscsi_intr, IRQF_SHARED,
	"NCR5380", instance);
	if (error)
	goto fail_irq;
	}

	error = scsi_add_host(instance, NULL);
	if (error)
	goto fail_host;

	platform_set_drvdata(pdev, instance);

	scsi_scan_host(instance);
	return 0;

	fail_host:
	if (instance->irq != NO_IRQ)
	free_irq(instance->irq, instance);
	fail_irq:
	NCR5380_exit(instance);
	scsi_host_put(instance);
	return error;
	}

	static int __exit mac_scsi_remove(struct platform_device *pdev)
	{
	struct Scsi_Host *instance = platform_get_drvdata(pdev);

	scsi_remove_host(instance);
	if (instance->irq != NO_IRQ)
	free_irq(instance->irq, instance);
	NCR5380_exit(instance);
	scsi_host_put(instance);
	return 0;
	}

	static struct platform_driver mac_scsi_driver = {
	.remove = __exit_p(mac_scsi_remove),
	.driver = {
	.name = DRV_MODULE_NAME,
	},
	};

	module_platform_driver_probe(mac_scsi_driver, mac_scsi_probe);

	MODULE_ALIAS("platform:" DRV_MODULE_NAME);
	MODULE_LICENSE("GPL");