drivers/scsi/mac_scsi.c - kernel/msm-4.9 - Gitiles

 /*
  * Generic Macintosh NCR5380 driver
  *
  * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
  *
  * derived in part from:
  */
 /*
  * Generic Generic NCR5380 driver
  *
  * Copyright 1995, Russell King
  *
  * ALPHA RELEASE 1.
  *
  * For more information, please consult
  *
  * NCR 5380 Family
  * SCSI Protocol Controller
  * Databook
  *
  * NCR Microelectronics
  * 1635 Aeroplaza Drive
  * Colorado Springs, CO 80916
  * 1+ (719) 578-3400
  * 1+ (800) 334-5454
  */

 /*
  * $Log: mac_NCR5380.c,v $
  */

 #include <linux/types.h>
 #include <linux/stddef.h>
 #include <linux/ctype.h>
 #include <linux/delay.h>

 #include <linux/module.h>
 #include <linux/signal.h>
 #include <linux/sched.h>
 #include <linux/ioport.h>
 #include <linux/init.h>
 #include <linux/blkdev.h>
 #include <linux/interrupt.h>

 #include <asm/io.h>
 #include <asm/irq.h>
 #include <asm/system.h>

 #include <asm/macintosh.h>
 #include <asm/macints.h>
 #include <asm/machw.h>
 #include <asm/mac_via.h>

 #include "scsi.h"
 #include <scsi/scsi_host.h>
 #include "mac_scsi.h"
 #include "NCR5380.h"

 #if 0
 #define NDEBUG (NDEBUG_INTR | NDEBUG_PSEUDO_DMA | NDEBUG_ARBITRATION | NDEBUG_SELECTION | NDEBUG_RESELECTION)
 #else
 #define NDEBUG (NDEBUG_ABORT)
 #endif

 #define RESET_BOOT
 #define DRIVER_SETUP

 extern void via_scsi_clear(void);

 #ifdef RESET_BOOT
 static void mac_scsi_reset_boot(struct Scsi_Host *instance);
 #endif

 static int setup_called = 0;
 static int setup_can_queue = -1;
 static int setup_cmd_per_lun = -1;
 static int setup_sg_tablesize = -1;
 static int setup_use_pdma = -1;
 #ifdef SUPPORT_TAGS
 static int setup_use_tagged_queuing = -1;
 #endif
 static int setup_hostid = -1;

 /* 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

 static volatile unsigned char *mac_scsi_regp = NULL;
 static volatile unsigned char *mac_scsi_drq  = NULL;
 static volatile unsigned char *mac_scsi_nodrq = NULL;


 /*
  * NCR 5380 register access functions
  */

 #if 0
 /* Debug versions */
 #define CTRL(p,v) (*ctrl = (v))

 static char macscsi_read(struct Scsi_Host *instance, int reg)
 {
   int iobase = instance->io_port;
   int i;
   int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;

   CTRL(iobase, 0);
   i = in_8(iobase + (reg<<4));
   CTRL(iobase, 0x40);

   return i;
 }

 static void macscsi_write(struct Scsi_Host *instance, int reg, int value)
 {
   int iobase = instance->io_port;
   int *ctrl = &((struct NCR5380_hostdata *)instance->hostdata)->ctrl;

   CTRL(iobase, 0);
   out_8(iobase + (reg<<4), value);
   CTRL(iobase, 0x40);
 }
 #else

 /* Fast versions */
 static __inline__ char macscsi_read(struct Scsi_Host *instance, int reg)
 {
   return in_8(instance->io_port + (reg<<4));
 }

 static __inline__ void macscsi_write(struct Scsi_Host *instance, int reg, int value)
 {
   out_8(instance->io_port + (reg<<4), value);
 }
 #endif


 /*
  * Function : mac_scsi_setup(char *str)
  *
  * Purpose : booter command line initialization of the overrides array,
  *
  * Inputs : str - comma delimited list of options
  *
  */

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

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

 	if (setup_called++ || ints[0] < 1 || ints[0] > 6) {
 	    printk(KERN_WARNING "scsi: <mac5380>"
 		" Usage: mac5380=<can_queue>[,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>,<use_pdma>]\n");
 	    printk(KERN_ALERT "scsi: <mac5380> Bad Penguin parameters?\n");
 	    return 0;
 	}

 	if (ints[0] >= 1) {
 		if (ints[1] > 0)
 			/* no limits on this, just > 0 */
 			setup_can_queue = ints[1];
 	}
 	if (ints[0] >= 2) {
 		if (ints[2] > 0)
 			setup_cmd_per_lun = ints[2];
 	}
 	if (ints[0] >= 3) {
 		if (ints[3] >= 0) {
 			setup_sg_tablesize = ints[3];
 			/* Must be <= SG_ALL (255) */
 			if (setup_sg_tablesize > SG_ALL)
 				setup_sg_tablesize = SG_ALL;
 		}
 	}
 	if (ints[0] >= 4) {
 		/* Must be between 0 and 7 */
 		if (ints[4] >= 0 && ints[4] <= 7)
 			setup_hostid = ints[4];
 		else if (ints[4] > 7)
 			printk(KERN_WARNING "mac_scsi_setup: invalid host ID %d !\n", ints[4] );
 	}
 #ifdef SUPPORT_TAGS
 	if (ints[0] >= 5) {
 		if (ints[5] >= 0)
 			setup_use_tagged_queuing = !!ints[5];
 	}

 	if (ints[0] == 6) {
 	    if (ints[6] >= 0)
 		setup_use_pdma = ints[6];
 	}
 #else
 	if (ints[0] == 5) {
 	    if (ints[5] >= 0)
 		setup_use_pdma = ints[5];
 	}
 #endif /* SUPPORT_TAGS */

 #endif /* DRIVER_SETUP */
 	return 1;
 }

 __setup("mac5380=", mac_scsi_setup);

 /*
  * If you want to find the instance with (k)gdb ...
  */
 #if NDEBUG
 static struct Scsi_Host *default_instance;
 #endif

 /*
  * Function : int macscsi_detect(struct scsi_host_template * tpnt)
  *
  * Purpose : initializes mac NCR5380 driver based on the
  *	command line / compile time port and irq definitions.
  *
  * Inputs : tpnt - template for this SCSI adapter.
  *
  * Returns : 1 if a host adapter was found, 0 if not.
  *
  */

 int macscsi_detect(struct scsi_host_template * tpnt)
 {
     static int called = 0;
     int flags = 0;
     struct Scsi_Host *instance;

     if (!MACH_IS_MAC || called)
 	return( 0 );

     if (macintosh_config->scsi_type != MAC_SCSI_OLD)
 	return( 0 );

     /* setup variables */
     tpnt->can_queue =
 	(setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
     tpnt->cmd_per_lun =
 	(setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
     tpnt->sg_tablesize =
 	(setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;

     if (setup_hostid >= 0)
 	tpnt->this_id = setup_hostid;
     else {
 	/* use 7 as default */
 	tpnt->this_id = 7;
     }

 #ifdef SUPPORT_TAGS
     if (setup_use_tagged_queuing < 0)
 	setup_use_tagged_queuing = USE_TAGGED_QUEUING;
 #endif

     /* Once we support multiple 5380s (e.g. DuoDock) we'll do
        something different here */
     instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
 #if NDEBUG
     default_instance = instance;
 #endif

     if (macintosh_config->ident == MAC_MODEL_IIFX) {
 	mac_scsi_regp  = via1+0x8000;
 	mac_scsi_drq   = via1+0xE000;
 	mac_scsi_nodrq = via1+0xC000;
 	/* The IIFX should be able to do true DMA, but pseudo-dma doesn't work */
 	flags = FLAG_NO_PSEUDO_DMA;
     } else {
 	mac_scsi_regp  = via1+0x10000;
 	mac_scsi_drq   = via1+0x6000;
 	mac_scsi_nodrq = via1+0x12000;
     }

     if (! setup_use_pdma)
 	flags = FLAG_NO_PSEUDO_DMA;

     instance->io_port = (unsigned long) mac_scsi_regp;
     instance->irq = IRQ_MAC_SCSI;

 #ifdef RESET_BOOT
     mac_scsi_reset_boot(instance);
 #endif

     NCR5380_init(instance, flags);

     instance->n_io_port = 255;

     ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;

     if (instance->irq != SCSI_IRQ_NONE)
 	if (request_irq(instance->irq, NCR5380_intr, IRQ_FLG_SLOW,
 		"ncr5380", instance)) {
 	    printk(KERN_WARNING "scsi%d: IRQ%d not free, interrupts disabled\n",
 		   instance->host_no, instance->irq);
 	    instance->irq = SCSI_IRQ_NONE;
 	}

     printk(KERN_INFO "scsi%d: generic 5380 at port %lX irq", instance->host_no, instance->io_port);
     if (instance->irq == SCSI_IRQ_NONE)
 	printk (KERN_INFO "s disabled");
     else
 	printk (KERN_INFO " %d", instance->irq);
     printk(KERN_INFO " options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
 	   instance->can_queue, instance->cmd_per_lun, MACSCSI_PUBLIC_RELEASE);
     printk(KERN_INFO "\nscsi%d:", instance->host_no);
     NCR5380_print_options(instance);
     printk("\n");
     called = 1;
     return 1;
 }

 int macscsi_release (struct Scsi_Host *shpnt)
 {
 	if (shpnt->irq != SCSI_IRQ_NONE)
 		free_irq (shpnt->irq, NCR5380_intr);
 	NCR5380_exit(shpnt);

 	return 0;
 }

 #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..." );

 	/* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
 	disable_irq(IRQ_MAC_SCSI);

 	/* 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();

 	/* switch on SCSI IRQ again */
 	enable_irq(IRQ_MAC_SCSI);

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

 const char * macscsi_info (struct Scsi_Host *spnt) {
 	return "";
 }

 /*
    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
    beeing 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)
 {
    unsigned char *d;
    volatile unsigned char *s;

    NCR5380_local_declare();
    NCR5380_setup(instance);

    s = mac_scsi_drq+0x60;
    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)) {
       printk(KERN_ERR "Error in macscsi_pread\n");
       return -1;
    }

    CP_IO_TO_MEM(s, d, len);

    if (len != 0) {
       printk(KERN_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)
 {
    unsigned char *s;
    volatile unsigned char *d;

    NCR5380_local_declare();
    NCR5380_setup(instance);

    s = src;
    d = mac_scsi_drq;

 /* 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)) {
       printk(KERN_ERR "Error in macscsi_pwrite\n");
       return -1;
    }

    CP_MEM_TO_IO(s, d, len);

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

    return 0;
 }


 /* These control the behaviour of the generic 5380 core */
 #define AUTOSENSE
 #define PSEUDO_DMA

 #include "NCR5380.c"

 static struct scsi_host_template driver_template = {
 	.proc_name			= "Mac5380",
 	.proc_info			= macscsi_proc_info,
 	.name				= "Macintosh NCR5380 SCSI",
 	.detect				= macscsi_detect,
 	.release			= macscsi_release,
 	.info				= macscsi_info,
 	.queuecommand			= macscsi_queue_command,
 	.eh_abort_handler		= macscsi_abort,
 	.eh_bus_reset_handler		= macscsi_bus_reset,
 	.can_queue			= CAN_QUEUE,
 	.this_id			= 7,
 	.sg_tablesize			= SG_ALL,
 	.cmd_per_lun			= CMD_PER_LUN,
 	.unchecked_isa_dma		= 0,
 	.use_clustering			= DISABLE_CLUSTERING
 };


 #include "scsi_module.c"
	/*
	* Generic Macintosh NCR5380 driver
	*
	* Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
	*
	* derived in part from:
	*/
	/*
	* Generic Generic NCR5380 driver
	*
	* Copyright 1995, Russell King
	*
	* ALPHA RELEASE 1.
	*
	* For more information, please consult
	*
	* NCR 5380 Family
	* SCSI Protocol Controller
	* Databook
	*
	* NCR Microelectronics
	* 1635 Aeroplaza Drive
	* Colorado Springs, CO 80916
	* 1+ (719) 578-3400
	* 1+ (800) 334-5454
	*/

	/*
	* $Log: mac_NCR5380.c,v $
	*/

	#include <linux/types.h>
	#include <linux/stddef.h>
	#include <linux/ctype.h>
	#include <linux/delay.h>

	#include <linux/module.h>
	#include <linux/signal.h>
	#include <linux/sched.h>
	#include <linux/ioport.h>
	#include <linux/init.h>
	#include <linux/blkdev.h>
	#include <linux/interrupt.h>

	#include <asm/io.h>
	#include <asm/irq.h>
	#include <asm/system.h>

	#include <asm/macintosh.h>
	#include <asm/macints.h>
	#include <asm/machw.h>
	#include <asm/mac_via.h>

	#include "scsi.h"
	#include <scsi/scsi_host.h>
	#include "mac_scsi.h"
	#include "NCR5380.h"

	#if 0
	#define NDEBUG (NDEBUG_INTR \| NDEBUG_PSEUDO_DMA \| NDEBUG_ARBITRATION \| NDEBUG_SELECTION \| NDEBUG_RESELECTION)
	#else
	#define NDEBUG (NDEBUG_ABORT)
	#endif

	#define RESET_BOOT
	#define DRIVER_SETUP

	extern void via_scsi_clear(void);

	#ifdef RESET_BOOT
	static void mac_scsi_reset_boot(struct Scsi_Host *instance);
	#endif

	static int setup_called = 0;
	static int setup_can_queue = -1;
	static int setup_cmd_per_lun = -1;
	static int setup_sg_tablesize = -1;
	static int setup_use_pdma = -1;
	#ifdef SUPPORT_TAGS
	static int setup_use_tagged_queuing = -1;
	#endif
	static int setup_hostid = -1;

	/* 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

	static volatile unsigned char *mac_scsi_regp = NULL;
	static volatile unsigned char *mac_scsi_drq = NULL;
	static volatile unsigned char *mac_scsi_nodrq = NULL;


	/*
	* NCR 5380 register access functions
	*/

	#if 0
	/* Debug versions */
	#define CTRL(p,v) (*ctrl = (v))

	static char macscsi_read(struct Scsi_Host *instance, int reg)
	{
	int iobase = instance->io_port;
	int i;
	int ctrl = &((struct NCR5380_hostdata )instance->hostdata)->ctrl;

	CTRL(iobase, 0);
	i = in_8(iobase + (reg<<4));
	CTRL(iobase, 0x40);

	return i;
	}

	static void macscsi_write(struct Scsi_Host *instance, int reg, int value)
	{
	int iobase = instance->io_port;
	int ctrl = &((struct NCR5380_hostdata )instance->hostdata)->ctrl;

	CTRL(iobase, 0);
	out_8(iobase + (reg<<4), value);
	CTRL(iobase, 0x40);
	}
	#else

	/* Fast versions */
	static __inline__ char macscsi_read(struct Scsi_Host *instance, int reg)
	{
	return in_8(instance->io_port + (reg<<4));
	}

	static __inline__ void macscsi_write(struct Scsi_Host *instance, int reg, int value)
	{
	out_8(instance->io_port + (reg<<4), value);
	}
	#endif


	/*
	* Function : mac_scsi_setup(char *str)
	*
	* Purpose : booter command line initialization of the overrides array,
	*
	* Inputs : str - comma delimited list of options
	*
	*/

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

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

	if (setup_called++ \|\| ints[0] < 1 \|\| ints[0] > 6) {
	printk(KERN_WARNING "scsi: <mac5380>"
	" Usage: mac5380=<can_queue>[,<cmd_per_lun>,<sg_tablesize>,<hostid>,<use_tags>,<use_pdma>]\n");
	printk(KERN_ALERT "scsi: <mac5380> Bad Penguin parameters?\n");
	return 0;
	}

	if (ints[0] >= 1) {
	if (ints[1] > 0)
	/* no limits on this, just > 0 */
	setup_can_queue = ints[1];
	}
	if (ints[0] >= 2) {
	if (ints[2] > 0)
	setup_cmd_per_lun = ints[2];
	}
	if (ints[0] >= 3) {
	if (ints[3] >= 0) {
	setup_sg_tablesize = ints[3];
	/* Must be <= SG_ALL (255) */
	if (setup_sg_tablesize > SG_ALL)
	setup_sg_tablesize = SG_ALL;
	}
	}
	if (ints[0] >= 4) {
	/* Must be between 0 and 7 */
	if (ints[4] >= 0 && ints[4] <= 7)
	setup_hostid = ints[4];
	else if (ints[4] > 7)
	printk(KERN_WARNING "mac_scsi_setup: invalid host ID %d !\n", ints[4] );
	}
	#ifdef SUPPORT_TAGS
	if (ints[0] >= 5) {
	if (ints[5] >= 0)
	setup_use_tagged_queuing = !!ints[5];
	}

	if (ints[0] == 6) {
	if (ints[6] >= 0)
	setup_use_pdma = ints[6];
	}
	#else
	if (ints[0] == 5) {
	if (ints[5] >= 0)
	setup_use_pdma = ints[5];
	}
	#endif /* SUPPORT_TAGS */

	#endif /* DRIVER_SETUP */
	return 1;
	}

	__setup("mac5380=", mac_scsi_setup);

	/*
	* If you want to find the instance with (k)gdb ...
	*/
	#if NDEBUG
	static struct Scsi_Host *default_instance;
	#endif

	/*
	* Function : int macscsi_detect(struct scsi_host_template * tpnt)
	*
	* Purpose : initializes mac NCR5380 driver based on the
	* command line / compile time port and irq definitions.
	*
	* Inputs : tpnt - template for this SCSI adapter.
	*
	* Returns : 1 if a host adapter was found, 0 if not.
	*
	*/

	int macscsi_detect(struct scsi_host_template * tpnt)
	{
	static int called = 0;
	int flags = 0;
	struct Scsi_Host *instance;

	if (!MACH_IS_MAC \|\| called)
	return( 0 );

	if (macintosh_config->scsi_type != MAC_SCSI_OLD)
	return( 0 );

	/* setup variables */
	tpnt->can_queue =
	(setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
	tpnt->cmd_per_lun =
	(setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
	tpnt->sg_tablesize =
	(setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;

	if (setup_hostid >= 0)
	tpnt->this_id = setup_hostid;
	else {
	/* use 7 as default */
	tpnt->this_id = 7;
	}

	#ifdef SUPPORT_TAGS
	if (setup_use_tagged_queuing < 0)
	setup_use_tagged_queuing = USE_TAGGED_QUEUING;
	#endif

	/* Once we support multiple 5380s (e.g. DuoDock) we'll do
	something different here */
	instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
	#if NDEBUG
	default_instance = instance;
	#endif

	if (macintosh_config->ident == MAC_MODEL_IIFX) {
	mac_scsi_regp = via1+0x8000;
	mac_scsi_drq = via1+0xE000;
	mac_scsi_nodrq = via1+0xC000;
	/* The IIFX should be able to do true DMA, but pseudo-dma doesn't work */
	flags = FLAG_NO_PSEUDO_DMA;
	} else {
	mac_scsi_regp = via1+0x10000;
	mac_scsi_drq = via1+0x6000;
	mac_scsi_nodrq = via1+0x12000;
	}

	if (! setup_use_pdma)
	flags = FLAG_NO_PSEUDO_DMA;

	instance->io_port = (unsigned long) mac_scsi_regp;
	instance->irq = IRQ_MAC_SCSI;

	#ifdef RESET_BOOT
	mac_scsi_reset_boot(instance);
	#endif

	NCR5380_init(instance, flags);

	instance->n_io_port = 255;

	((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;

	if (instance->irq != SCSI_IRQ_NONE)
	if (request_irq(instance->irq, NCR5380_intr, IRQ_FLG_SLOW,
	"ncr5380", instance)) {
	printk(KERN_WARNING "scsi%d: IRQ%d not free, interrupts disabled\n",
	instance->host_no, instance->irq);
	instance->irq = SCSI_IRQ_NONE;
	}

	printk(KERN_INFO "scsi%d: generic 5380 at port %lX irq", instance->host_no, instance->io_port);
	if (instance->irq == SCSI_IRQ_NONE)
	printk (KERN_INFO "s disabled");
	else
	printk (KERN_INFO " %d", instance->irq);
	printk(KERN_INFO " options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
	instance->can_queue, instance->cmd_per_lun, MACSCSI_PUBLIC_RELEASE);
	printk(KERN_INFO "\nscsi%d:", instance->host_no);
	NCR5380_print_options(instance);
	printk("\n");
	called = 1;
	return 1;
	}

	int macscsi_release (struct Scsi_Host *shpnt)
	{
	if (shpnt->irq != SCSI_IRQ_NONE)
	free_irq (shpnt->irq, NCR5380_intr);
	NCR5380_exit(shpnt);

	return 0;
	}

	#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..." );

	/* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
	disable_irq(IRQ_MAC_SCSI);

	/* 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();

	/* switch on SCSI IRQ again */
	enable_irq(IRQ_MAC_SCSI);

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

	const char * macscsi_info (struct Scsi_Host *spnt) {
	return "";
	}

	/*
	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
	beeing 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)
	{
	unsigned char *d;
	volatile unsigned char *s;

	NCR5380_local_declare();
	NCR5380_setup(instance);

	s = mac_scsi_drq+0x60;
	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)) {
	printk(KERN_ERR "Error in macscsi_pread\n");
	return -1;
	}

	CP_IO_TO_MEM(s, d, len);

	if (len != 0) {
	printk(KERN_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)
	{
	unsigned char *s;
	volatile unsigned char *d;

	NCR5380_local_declare();
	NCR5380_setup(instance);

	s = src;
	d = mac_scsi_drq;

	/* 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)) {
	printk(KERN_ERR "Error in macscsi_pwrite\n");
	return -1;
	}

	CP_MEM_TO_IO(s, d, len);

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

	return 0;
	}


	/* These control the behaviour of the generic 5380 core */
	#define AUTOSENSE
	#define PSEUDO_DMA

	#include "NCR5380.c"

	static struct scsi_host_template driver_template = {
	.proc_name = "Mac5380",
	.proc_info = macscsi_proc_info,
	.name = "Macintosh NCR5380 SCSI",
	.detect = macscsi_detect,
	.release = macscsi_release,
	.info = macscsi_info,
	.queuecommand = macscsi_queue_command,
	.eh_abort_handler = macscsi_abort,
	.eh_bus_reset_handler = macscsi_bus_reset,
	.can_queue = CAN_QUEUE,
	.this_id = 7,
	.sg_tablesize = SG_ALL,
	.cmd_per_lun = CMD_PER_LUN,
	.unchecked_isa_dma = 0,
	.use_clustering = DISABLE_CLUSTERING
	};


	#include "scsi_module.c"