[linux-block.git] / drivers / scsi / mac_scsi.c

/*
 * 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_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;

	/*
	 * 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;

	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;

	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");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Generic Macintosh NCR5380 driver
	3	*
	4	* Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
	5	*
	6	* derived in part from:
	7	*/
	8	/*
	9	* Generic Generic NCR5380 driver
	10	*
	11	* Copyright 1995, Russell King
1da177e4 LT	12	*/
1da177e4 LT	13
1da177e4	14	#include <linux/types.h>
1da177e4	15	#include <linux/delay.h>
1da177e4	16	#include <linux/module.h>
1da177e4 LT	17	#include <linux/ioport.h>
	18	#include <linux/init.h>
	19	#include <linux/blkdev.h>
	20	#include <linux/interrupt.h>
cbad48de	21	#include <linux/platform_device.h>
1da177e4	22
cbad48de	23	#include <asm/hwtest.h>
1da177e4	24	#include <asm/io.h>
1da177e4	25	#include <asm/macints.h>
cbad48de	26	#include <asm/setup.h>
1da177e4	27
1da177e4	28	#include <scsi/scsi_host.h>
92de3831 FT	29
92de3831 FT	30	/* Definitions for the core NCR5380 driver. */
e744fdea	31
e744fdea BH	32	#define PSEUDO_DMA
e744fdea BH	33
cbad48de	34	#define NCR5380_implementation_fields unsigned char *pdma_base
92de3831	35
54d8fe44 FT	36	#define NCR5380_read(reg) macscsi_read(instance, reg)
54d8fe44 FT	37	#define NCR5380_write(reg, value) macscsi_write(instance, reg, value)
92de3831 FT	38
	39	#define NCR5380_pread macscsi_pread
	40	#define NCR5380_pwrite macscsi_pwrite
	41
	42	#define NCR5380_intr macscsi_intr
	43	#define NCR5380_queue_command macscsi_queue_command
	44	#define NCR5380_abort macscsi_abort
	45	#define NCR5380_bus_reset macscsi_bus_reset
	46	#define NCR5380_info macscsi_info
	47	#define NCR5380_show_info macscsi_show_info
	48	#define NCR5380_write_info macscsi_write_info
	49
1da177e4 LT	50	#include "NCR5380.h"
1da177e4 LT	51
1da177e4	52	#define RESET_BOOT
1da177e4	53
1da177e4	54	static int setup_can_queue = -1;
6e9ae6d5	55	module_param(setup_can_queue, int, 0);
1da177e4	56	static int setup_cmd_per_lun = -1;
6e9ae6d5	57	module_param(setup_cmd_per_lun, int, 0);
1da177e4	58	static int setup_sg_tablesize = -1;
6e9ae6d5	59	module_param(setup_sg_tablesize, int, 0);
1da177e4	60	static int setup_use_pdma = -1;
6e9ae6d5	61	module_param(setup_use_pdma, int, 0);
1da177e4	62	static int setup_use_tagged_queuing = -1;
6e9ae6d5	63	module_param(setup_use_tagged_queuing, int, 0);
1da177e4	64	static int setup_hostid = -1;
6e9ae6d5	65	module_param(setup_hostid, int, 0);
1da177e4 LT	66
	67	/* Time (in jiffies) to wait after a reset; the SCSI standard calls for 250ms,
	68	* we usually do 0.5s to be on the safe side. But Toshiba CD-ROMs once more
	69	* need ten times the standard value... */
	70	#define TOSHIBA_DELAY
	71
	72	#ifdef TOSHIBA_DELAY
	73	#define AFTER_RESET_DELAY (5*HZ/2)
	74	#else
	75	#define AFTER_RESET_DELAY (HZ/2)
	76	#endif
	77
1da177e4 LT	78	/*
	79	* NCR 5380 register access functions
	80	*/
	81
cbad48de	82	static inline char macscsi_read(struct Scsi_Host *instance, int reg)
1da177e4	83	{
cbad48de	84	return in_8(instance->base + (reg << 4));
1da177e4 LT	85	}
1da177e4 LT	86
cbad48de	87	static inline void macscsi_write(struct Scsi_Host *instance, int reg, int value)
1da177e4	88	{
cbad48de	89	out_8(instance->base + (reg << 4), value);
1da177e4	90	}
1da177e4	91
6e9ae6d5 FT	92	#ifndef MODULE
	93	static int __init mac_scsi_setup(char *str)
	94	{
1da177e4	95	int ints[7];
6e9ae6d5 FT	96
	97	(void)get_options(str, ARRAY_SIZE(ints), ints);
	98
	99	if (ints[0] < 1 \|\| ints[0] > 6) {
	100	pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>]]]]]\n");
	101	return 0;
1da177e4	102	}
6e9ae6d5 FT	103	if (ints[0] >= 1)
	104	setup_can_queue = ints[1];
	105	if (ints[0] >= 2)
	106	setup_cmd_per_lun = ints[2];
	107	if (ints[0] >= 3)
	108	setup_sg_tablesize = ints[3];
	109	if (ints[0] >= 4)
	110	setup_hostid = ints[4];
	111	if (ints[0] >= 5)
	112	setup_use_tagged_queuing = ints[5];
	113	if (ints[0] >= 6)
1da177e4	114	setup_use_pdma = ints[6];
1da177e4 LT	115	return 1;
	116	}
	117
	118	__setup("mac5380=", mac_scsi_setup);
6e9ae6d5	119	#endif /* !MODULE */
1da177e4	120
1da177e4 LT	121	#ifdef RESET_BOOT
	122	/*
	123	* Our 'bus reset on boot' function
	124	*/
	125
	126	static void mac_scsi_reset_boot(struct Scsi_Host *instance)
	127	{
	128	unsigned long end;
	129
1da177e4 LT	130	/*
	131	* Do a SCSI reset to clean up the bus during initialization. No messing
	132	* with the queues, interrupts, or locks necessary here.
	133	*/
	134
	135	printk(KERN_INFO "Macintosh SCSI: resetting the SCSI bus..." );
	136
1da177e4 LT	137	/* get in phase */
	138	NCR5380_write( TARGET_COMMAND_REG,
	139	PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
	140
	141	/* assert RST */
	142	NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE \| ICR_ASSERT_RST );
	143	/* The min. reset hold time is 25us, so 40us should be enough */
	144	udelay( 50 );
	145	/* reset RST and interrupt */
	146	NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
	147	NCR5380_read( RESET_PARITY_INTERRUPT_REG );
	148
	149	for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
	150	barrier();
	151
1da177e4 LT	152	printk(KERN_INFO " done\n" );
	153	}
	154	#endif
	155
ffdede67	156	#ifdef PSEUDO_DMA
1da177e4 LT	157	/*
	158	Pseudo-DMA: (Ove Edlund)
	159	The code attempts to catch bus errors that occur if one for example
	160	"trips over the cable".
	161	XXX: Since bus errors in the PDMA routines never happen on my
	162	computer, the bus error code is untested.
	163	If the code works as intended, a bus error results in Pseudo-DMA
542cb459	164	being disabled, meaning that the driver switches to slow handshake.
1da177e4 LT	165	If bus errors are NOT extremely rare, this has to be changed.
	166	*/
	167
	168	#define CP_IO_TO_MEM(s,d,len) \
	169	__asm__ __volatile__ \
	170	(" cmp.w #4,%2\n" \
	171	" bls 8f\n" \
	172	" move.w %1,%%d0\n" \
	173	" neg.b %%d0\n" \
	174	" and.w #3,%%d0\n" \
	175	" sub.w %%d0,%2\n" \
	176	" bra 2f\n" \
	177	" 1: move.b (%0),(%1)+\n" \
	178	" 2: dbf %%d0,1b\n" \
	179	" move.w %2,%%d0\n" \
	180	" lsr.w #5,%%d0\n" \
	181	" bra 4f\n" \
	182	" 3: move.l (%0),(%1)+\n" \
	183	"31: move.l (%0),(%1)+\n" \
	184	"32: move.l (%0),(%1)+\n" \
	185	"33: move.l (%0),(%1)+\n" \
	186	"34: move.l (%0),(%1)+\n" \
	187	"35: move.l (%0),(%1)+\n" \
	188	"36: move.l (%0),(%1)+\n" \
	189	"37: move.l (%0),(%1)+\n" \
	190	" 4: dbf %%d0,3b\n" \
	191	" move.w %2,%%d0\n" \
	192	" lsr.w #2,%%d0\n" \
	193	" and.w #7,%%d0\n" \
	194	" bra 6f\n" \
	195	" 5: move.l (%0),(%1)+\n" \
	196	" 6: dbf %%d0,5b\n" \
	197	" and.w #3,%2\n" \
	198	" bra 8f\n" \
	199	" 7: move.b (%0),(%1)+\n" \
	200	" 8: dbf %2,7b\n" \
	201	" moveq.l #0, %2\n" \
	202	" 9: \n" \
	203	".section .fixup,\"ax\"\n" \
	204	" .even\n" \
	205	"90: moveq.l #1, %2\n" \
	206	" jra 9b\n" \
	207	".previous\n" \
	208	".section __ex_table,\"a\"\n" \
	209	" .align 4\n" \
	210	" .long 1b,90b\n" \
	211	" .long 3b,90b\n" \
	212	" .long 31b,90b\n" \
	213	" .long 32b,90b\n" \
	214	" .long 33b,90b\n" \
	215	" .long 34b,90b\n" \
	216	" .long 35b,90b\n" \
	217	" .long 36b,90b\n" \
	218	" .long 37b,90b\n" \
	219	" .long 5b,90b\n" \
	220	" .long 7b,90b\n" \
	221	".previous" \
	222	: "=a"(s), "=a"(d), "=d"(len) \
	223	: "0"(s), "1"(d), "2"(len) \
	224	: "d0")
	225
ffdede67 FT	226	static int macscsi_pread(struct Scsi_Host *instance,
ffdede67 FT	227	unsigned char *dst, int len)
1da177e4	228	{
cbad48de	229	struct NCR5380_hostdata *hostdata = shost_priv(instance);
ffdede67 FT	230	unsigned char *d;
	231	unsigned char *s;
	232
cbad48de	233	s = hostdata->pdma_base + (INPUT_DATA_REG << 4);
ffdede67 FT	234	d = dst;
	235
	236	/* These conditions are derived from MacOS */
	237
	238	while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) &&
	239	!(NCR5380_read(STATUS_REG) & SR_REQ))
	240	;
	241
	242	if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) &&
	243	(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)) {
	244	pr_err("Error in macscsi_pread\n");
	245	return -1;
	246	}
	247
	248	CP_IO_TO_MEM(s, d, len);
	249
	250	if (len != 0) {
	251	pr_notice("Bus error in macscsi_pread\n");
	252	return -1;
	253	}
	254
	255	return 0;
1da177e4 LT	256	}
	257
	258
	259	#define CP_MEM_TO_IO(s,d,len) \
	260	__asm__ __volatile__ \
	261	(" cmp.w #4,%2\n" \
	262	" bls 8f\n" \
	263	" move.w %0,%%d0\n" \
	264	" neg.b %%d0\n" \
	265	" and.w #3,%%d0\n" \
	266	" sub.w %%d0,%2\n" \
	267	" bra 2f\n" \
	268	" 1: move.b (%0)+,(%1)\n" \
	269	" 2: dbf %%d0,1b\n" \
	270	" move.w %2,%%d0\n" \
	271	" lsr.w #5,%%d0\n" \
	272	" bra 4f\n" \
	273	" 3: move.l (%0)+,(%1)\n" \
	274	"31: move.l (%0)+,(%1)\n" \
	275	"32: move.l (%0)+,(%1)\n" \
	276	"33: move.l (%0)+,(%1)\n" \
	277	"34: move.l (%0)+,(%1)\n" \
	278	"35: move.l (%0)+,(%1)\n" \
	279	"36: move.l (%0)+,(%1)\n" \
	280	"37: move.l (%0)+,(%1)\n" \
	281	" 4: dbf %%d0,3b\n" \
	282	" move.w %2,%%d0\n" \
	283	" lsr.w #2,%%d0\n" \
	284	" and.w #7,%%d0\n" \
	285	" bra 6f\n" \
	286	" 5: move.l (%0)+,(%1)\n" \
	287	" 6: dbf %%d0,5b\n" \
	288	" and.w #3,%2\n" \
	289	" bra 8f\n" \
	290	" 7: move.b (%0)+,(%1)\n" \
	291	" 8: dbf %2,7b\n" \
	292	" moveq.l #0, %2\n" \
	293	" 9: \n" \
	294	".section .fixup,\"ax\"\n" \
	295	" .even\n" \
	296	"90: moveq.l #1, %2\n" \
	297	" jra 9b\n" \
	298	".previous\n" \
	299	".section __ex_table,\"a\"\n" \
	300	" .align 4\n" \
	301	" .long 1b,90b\n" \
	302	" .long 3b,90b\n" \
	303	" .long 31b,90b\n" \
	304	" .long 32b,90b\n" \
	305	" .long 33b,90b\n" \
	306	" .long 34b,90b\n" \
	307	" .long 35b,90b\n" \
	308	" .long 36b,90b\n" \
	309	" .long 37b,90b\n" \
	310	" .long 5b,90b\n" \
	311	" .long 7b,90b\n" \
	312	".previous" \
	313	: "=a"(s), "=a"(d), "=d"(len) \
	314	: "0"(s), "1"(d), "2"(len) \
	315	: "d0")
	316
ffdede67 FT	317	static int macscsi_pwrite(struct Scsi_Host *instance,
ffdede67 FT	318	unsigned char *src, int len)
1da177e4	319	{
cbad48de	320	struct NCR5380_hostdata *hostdata = shost_priv(instance);
ffdede67 FT	321	unsigned char *s;
ffdede67 FT	322	unsigned char *d;
1da177e4	323
ffdede67	324	s = src;
cbad48de	325	d = hostdata->pdma_base + (OUTPUT_DATA_REG << 4);
ffdede67 FT	326
	327	/* These conditions are derived from MacOS */
	328
	329	while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) &&
	330	(!(NCR5380_read(STATUS_REG) & SR_REQ) \|\|
	331	(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH)))
	332	;
	333
	334	if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ)) {
	335	pr_err("Error in macscsi_pwrite\n");
	336	return -1;
	337	}
	338
	339	CP_MEM_TO_IO(s, d, len);
	340
	341	if (len != 0) {
	342	pr_notice("Bus error in macscsi_pwrite\n");
	343	return -1;
	344	}
	345
	346	return 0;
	347	}
	348	#endif
1da177e4	349
1da177e4 LT	350	#include "NCR5380.c"
1da177e4 LT	351
cbad48de FT	352	#define DRV_MODULE_NAME "mac_scsi"
	353	#define PFX DRV_MODULE_NAME ": "
	354
	355	static struct scsi_host_template mac_scsi_template = {
	356	.module = THIS_MODULE,
	357	.proc_name = DRV_MODULE_NAME,
dd7ab71b AV	358	.show_info = macscsi_show_info,
dd7ab71b AV	359	.write_info = macscsi_write_info,
1da177e4	360	.name = "Macintosh NCR5380 SCSI",
1da177e4 LT	361	.info = macscsi_info,
	362	.queuecommand = macscsi_queue_command,
	363	.eh_abort_handler = macscsi_abort,
	364	.eh_bus_reset_handler = macscsi_bus_reset,
d572f65f	365	.can_queue = 16,
1da177e4 LT	366	.this_id = 7,
1da177e4 LT	367	.sg_tablesize = SG_ALL,
d572f65f	368	.cmd_per_lun = 2,
1da177e4 LT	369	.use_clustering = DISABLE_CLUSTERING
	370	};
	371
cbad48de FT	372	static int __init mac_scsi_probe(struct platform_device *pdev)
	373	{
	374	struct Scsi_Host *instance;
	375	int error;
	376	int host_flags = 0;
	377	struct resource irq, pio_mem, *pdma_mem = NULL;
	378
	379	pio_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	380	if (!pio_mem)
	381	return -ENODEV;
	382
	383	#ifdef PSEUDO_DMA
	384	pdma_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	385	#endif
	386
	387	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	388
	389	if (!hwreg_present((unsigned char *)pio_mem->start +
	390	(STATUS_REG << 4))) {
	391	pr_info(PFX "no device detected at %pap\n", &pio_mem->start);
	392	return -ENODEV;
	393	}
	394
	395	if (setup_can_queue > 0)
	396	mac_scsi_template.can_queue = setup_can_queue;
	397	if (setup_cmd_per_lun > 0)
	398	mac_scsi_template.cmd_per_lun = setup_cmd_per_lun;
	399	if (setup_sg_tablesize >= 0)
	400	mac_scsi_template.sg_tablesize = setup_sg_tablesize;
	401	if (setup_hostid >= 0)
	402	mac_scsi_template.this_id = setup_hostid & 7;
cbad48de FT	403	if (setup_use_pdma < 0)
	404	setup_use_pdma = 0;
	405
	406	instance = scsi_host_alloc(&mac_scsi_template,
	407	sizeof(struct NCR5380_hostdata));
	408	if (!instance)
	409	return -ENOMEM;
	410
	411	instance->base = pio_mem->start;
	412	if (irq)
	413	instance->irq = irq->start;
	414	else
	415	instance->irq = NO_IRQ;
	416
	417	if (pdma_mem && setup_use_pdma) {
	418	struct NCR5380_hostdata *hostdata = shost_priv(instance);
	419
	420	hostdata->pdma_base = (unsigned char *)pdma_mem->start;
	421	} else
	422	host_flags \|= FLAG_NO_PSEUDO_DMA;
	423
	424	#ifdef RESET_BOOT
	425	mac_scsi_reset_boot(instance);
	426	#endif
	427
ca513fc9 FT	428	#ifdef SUPPORT_TAGS
	429	host_flags \|= setup_use_tagged_queuing > 0 ? FLAG_TAGGED_QUEUING : 0;
	430	#endif
	431
cbad48de FT	432	NCR5380_init(instance, host_flags);
	433
	434	if (instance->irq != NO_IRQ) {
	435	error = request_irq(instance->irq, macscsi_intr, IRQF_SHARED,
	436	"NCR5380", instance);
	437	if (error)
	438	goto fail_irq;
	439	}
	440
	441	error = scsi_add_host(instance, NULL);
	442	if (error)
	443	goto fail_host;
	444
	445	platform_set_drvdata(pdev, instance);
	446
	447	scsi_scan_host(instance);
	448	return 0;
	449
	450	fail_host:
	451	if (instance->irq != NO_IRQ)
	452	free_irq(instance->irq, instance);
	453	fail_irq:
	454	NCR5380_exit(instance);
	455	scsi_host_put(instance);
	456	return error;
	457	}
	458
	459	static int __exit mac_scsi_remove(struct platform_device *pdev)
	460	{
	461	struct Scsi_Host *instance = platform_get_drvdata(pdev);
	462
	463	scsi_remove_host(instance);
	464	if (instance->irq != NO_IRQ)
	465	free_irq(instance->irq, instance);
	466	NCR5380_exit(instance);
	467	scsi_host_put(instance);
	468	return 0;
	469	}
	470
	471	static struct platform_driver mac_scsi_driver = {
	472	.remove = __exit_p(mac_scsi_remove),
	473	.driver = {
	474	.name = DRV_MODULE_NAME,
cbad48de FT	475	},
cbad48de FT	476	};
1da177e4	477
cbad48de	478	module_platform_driver_probe(mac_scsi_driver, mac_scsi_probe);
6e9ae6d5	479
cbad48de	480	MODULE_ALIAS("platform:" DRV_MODULE_NAME);
6e9ae6d5	481	MODULE_LICENSE("GPL");