[mirror_ubuntu-bionic-kernel.git] / drivers / scsi / mac_scsi.c

/*
 * Generic Macintosh NCR5380 driver
 *
 * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
 *
 * Copyright 2019 Finn Thain
 *
 * derived in part from:
 */
/*
 * Generic Generic NCR5380 driver
 *
 * Copyright 1995, Russell King
 */

#include <linux/delay.h>
#include <linux/types.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 NCR5380_implementation_fields   int pdma_residual

#define NCR5380_read(reg)           in_8(hostdata->io + ((reg) << 4))
#define NCR5380_write(reg, value)   out_8(hostdata->io + ((reg) << 4), value)

#define NCR5380_dma_xfer_len            macscsi_dma_xfer_len
#define NCR5380_dma_recv_setup          macscsi_pread
#define NCR5380_dma_send_setup          macscsi_pwrite
#define NCR5380_dma_residual            macscsi_dma_residual

#define NCR5380_intr                    macscsi_intr
#define NCR5380_queue_command           macscsi_queue_command
#define NCR5380_abort                   macscsi_abort
#define NCR5380_host_reset              macscsi_host_reset
#define NCR5380_info                    macscsi_info

#include "NCR5380.h"

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 = 512;
module_param(setup_use_pdma, int, 0);
static int setup_hostid = -1;
module_param(setup_hostid, int, 0);
static int setup_toshiba_delay = -1;
module_param(setup_toshiba_delay, int, 0);

#ifndef MODULE
static int __init mac_scsi_setup(char *str)
{
	int ints[8];

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

	if (ints[0] < 1) {
		pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>[,<toshiba_delay>]]]]]]\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];
	/* ints[5] (use_tagged_queuing) is ignored */
	if (ints[0] >= 6)
		setup_use_pdma = ints[6];
	if (ints[0] >= 7)
		setup_toshiba_delay = ints[7];
	return 1;
}

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

/*
 * According to "Inside Macintosh: Devices", Mac OS requires disk drivers to
 * specify the number of bytes between the delays expected from a SCSI target.
 * This allows the operating system to "prevent bus errors when a target fails
 * to deliver the next byte within the processor bus error timeout period."
 * Linux SCSI drivers lack knowledge of the timing behaviour of SCSI targets
 * so bus errors are unavoidable.
 *
 * If a MOVE.B instruction faults, we assume that zero bytes were transferred
 * and simply retry. That assumption probably depends on target behaviour but
 * seems to hold up okay. The NOP provides synchronization: without it the
 * fault can sometimes occur after the program counter has moved past the
 * offending instruction. Post-increment addressing can't be used.
 */

#define MOVE_BYTE(operands) \
	asm volatile ( \
		"1:     moveb " operands "     \n" \
		"11:    nop                    \n" \
		"       addq #1,%0             \n" \
		"       subq #1,%1             \n" \
		"40:                           \n" \
		"                              \n" \
		".section .fixup,\"ax\"        \n" \
		".even                         \n" \
		"90:    movel #1, %2           \n" \
		"       jra 40b                \n" \
		".previous                     \n" \
		"                              \n" \
		".section __ex_table,\"a\"     \n" \
		".align  4                     \n" \
		".long   1b,90b                \n" \
		".long  11b,90b                \n" \
		".previous                     \n" \
		: "+a" (addr), "+r" (n), "+r" (result) : "a" (io))

/*
 * If a MOVE.W (or MOVE.L) instruction faults, it cannot be retried because
 * the residual byte count would be uncertain. In that situation the MOVE_WORD
 * macro clears n in the fixup section to abort the transfer.
 */

#define MOVE_WORD(operands) \
	asm volatile ( \
		"1:     movew " operands "     \n" \
		"11:    nop                    \n" \
		"       subq #2,%1             \n" \
		"40:                           \n" \
		"                              \n" \
		".section .fixup,\"ax\"        \n" \
		".even                         \n" \
		"90:    movel #0, %1           \n" \
		"       movel #2, %2           \n" \
		"       jra 40b                \n" \
		".previous                     \n" \
		"                              \n" \
		".section __ex_table,\"a\"     \n" \
		".align  4                     \n" \
		".long   1b,90b                \n" \
		".long  11b,90b                \n" \
		".previous                     \n" \
		: "+a" (addr), "+r" (n), "+r" (result) : "a" (io))

#define MOVE_16_WORDS(operands) \
	asm volatile ( \
		"1:     movew " operands "     \n" \
		"2:     movew " operands "     \n" \
		"3:     movew " operands "     \n" \
		"4:     movew " operands "     \n" \
		"5:     movew " operands "     \n" \
		"6:     movew " operands "     \n" \
		"7:     movew " operands "     \n" \
		"8:     movew " operands "     \n" \
		"9:     movew " operands "     \n" \
		"10:    movew " operands "     \n" \
		"11:    movew " operands "     \n" \
		"12:    movew " operands "     \n" \
		"13:    movew " operands "     \n" \
		"14:    movew " operands "     \n" \
		"15:    movew " operands "     \n" \
		"16:    movew " operands "     \n" \
		"17:    nop                    \n" \
		"       subl  #32,%1           \n" \
		"40:                           \n" \
		"                              \n" \
		".section .fixup,\"ax\"        \n" \
		".even                         \n" \
		"90:    movel #0, %1           \n" \
		"       movel #2, %2           \n" \
		"       jra 40b                \n" \
		".previous                     \n" \
		"                              \n" \
		".section __ex_table,\"a\"     \n" \
		".align  4                     \n" \
		".long   1b,90b                \n" \
		".long   2b,90b                \n" \
		".long   3b,90b                \n" \
		".long   4b,90b                \n" \
		".long   5b,90b                \n" \
		".long   6b,90b                \n" \
		".long   7b,90b                \n" \
		".long   8b,90b                \n" \
		".long   9b,90b                \n" \
		".long  10b,90b                \n" \
		".long  11b,90b                \n" \
		".long  12b,90b                \n" \
		".long  13b,90b                \n" \
		".long  14b,90b                \n" \
		".long  15b,90b                \n" \
		".long  16b,90b                \n" \
		".long  17b,90b                \n" \
		".previous                     \n" \
		: "+a" (addr), "+r" (n), "+r" (result) : "a" (io))

#define MAC_PDMA_DELAY		32

static inline int mac_pdma_recv(void __iomem *io, unsigned char *start, int n)
{
	unsigned char *addr = start;
	int result = 0;

	if (n >= 1) {
		MOVE_BYTE("%3@,%0@");
		if (result)
			goto out;
	}
	if (n >= 1 && ((unsigned long)addr & 1)) {
		MOVE_BYTE("%3@,%0@");
		if (result)
			goto out;
	}
	while (n >= 32)
		MOVE_16_WORDS("%3@,%0@+");
	while (n >= 2)
		MOVE_WORD("%3@,%0@+");
	if (result)
		return start - addr; /* Negated to indicate uncertain length */
	if (n == 1)
		MOVE_BYTE("%3@,%0@");
out:
	return addr - start;
}

static inline int mac_pdma_send(unsigned char *start, void __iomem *io, int n)
{
	unsigned char *addr = start;
	int result = 0;

	if (n >= 1) {
		MOVE_BYTE("%0@,%3@");
		if (result)
			goto out;
	}
	if (n >= 1 && ((unsigned long)addr & 1)) {
		MOVE_BYTE("%0@,%3@");
		if (result)
			goto out;
	}
	while (n >= 32)
		MOVE_16_WORDS("%0@+,%3@");
	while (n >= 2)
		MOVE_WORD("%0@+,%3@");
	if (result)
		return start - addr; /* Negated to indicate uncertain length */
	if (n == 1)
		MOVE_BYTE("%0@,%3@");
out:
	return addr - start;
}

static inline int macscsi_pread(struct NCR5380_hostdata *hostdata,
                                unsigned char *dst, int len)
{
	u8 __iomem *s = hostdata->pdma_io + (INPUT_DATA_REG << 4);
	unsigned char *d = dst;

	hostdata->pdma_residual = len;

	while (!NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG,
	                              BASR_DRQ | BASR_PHASE_MATCH,
	                              BASR_DRQ | BASR_PHASE_MATCH, HZ / 64)) {
		int bytes;

		bytes = mac_pdma_recv(s, d, min(hostdata->pdma_residual, 512));

		if (bytes > 0) {
			d += bytes;
			hostdata->pdma_residual -= bytes;
		}

		if (hostdata->pdma_residual == 0)
			return 0;

		if (NCR5380_poll_politely2(hostdata, STATUS_REG, SR_REQ, SR_REQ,
		                           BUS_AND_STATUS_REG, BASR_ACK,
		                           BASR_ACK, HZ / 64) < 0)
			scmd_printk(KERN_DEBUG, hostdata->connected,
			            "%s: !REQ and !ACK\n", __func__);
		if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH))
			return 0;

		if (bytes == 0)
			udelay(MAC_PDMA_DELAY);

		if (bytes >= 0)
			continue;

		dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host,
		         "%s: bus error (%d/%d)\n", __func__, d - dst, len);
		NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
		return -1;
	}

	scmd_printk(KERN_ERR, hostdata->connected,
	            "%s: phase mismatch or !DRQ\n", __func__);
	NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
	return -1;
}

static inline int macscsi_pwrite(struct NCR5380_hostdata *hostdata,
                                 unsigned char *src, int len)
{
	unsigned char *s = src;
	u8 __iomem *d = hostdata->pdma_io + (OUTPUT_DATA_REG << 4);

	hostdata->pdma_residual = len;

	while (!NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG,
	                              BASR_DRQ | BASR_PHASE_MATCH,
	                              BASR_DRQ | BASR_PHASE_MATCH, HZ / 64)) {
		int bytes;

		bytes = mac_pdma_send(s, d, min(hostdata->pdma_residual, 512));

		if (bytes > 0) {
			s += bytes;
			hostdata->pdma_residual -= bytes;
		}

		if (hostdata->pdma_residual == 0) {
			if (NCR5380_poll_politely(hostdata, TARGET_COMMAND_REG,
			                          TCR_LAST_BYTE_SENT,
			                          TCR_LAST_BYTE_SENT, HZ / 64) < 0)
				scmd_printk(KERN_ERR, hostdata->connected,
				            "%s: Last Byte Sent timeout\n", __func__);
			return 0;
		}

		if (NCR5380_poll_politely2(hostdata, STATUS_REG, SR_REQ, SR_REQ,
		                           BUS_AND_STATUS_REG, BASR_ACK,
		                           BASR_ACK, HZ / 64) < 0)
			scmd_printk(KERN_DEBUG, hostdata->connected,
			            "%s: !REQ and !ACK\n", __func__);
		if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH))
			return 0;

		if (bytes == 0)
			udelay(MAC_PDMA_DELAY);

		if (bytes >= 0)
			continue;

		dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host,
		         "%s: bus error (%d/%d)\n", __func__, s - src, len);
		NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
		return -1;
	}

	scmd_printk(KERN_ERR, hostdata->connected,
	            "%s: phase mismatch or !DRQ\n", __func__);
	NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
	return -1;
}

static int macscsi_dma_xfer_len(struct NCR5380_hostdata *hostdata,
                                struct scsi_cmnd *cmd)
{
	if (hostdata->flags & FLAG_NO_PSEUDO_DMA ||
	    cmd->SCp.this_residual < setup_use_pdma)
		return 0;

	return cmd->SCp.this_residual;
}

static int macscsi_dma_residual(struct NCR5380_hostdata *hostdata)
{
	return hostdata->pdma_residual;
}

#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,
	.name			= "Macintosh NCR5380 SCSI",
	.info			= macscsi_info,
	.queuecommand		= macscsi_queue_command,
	.eh_abort_handler	= macscsi_abort,
	.eh_host_reset_handler	= macscsi_host_reset,
	.can_queue		= 16,
	.this_id		= 7,
	.sg_tablesize		= 1,
	.cmd_per_lun		= 2,
	.use_clustering		= DISABLE_CLUSTERING,
	.cmd_size		= NCR5380_CMD_SIZE,
	.max_sectors		= 128,
};

static int __init mac_scsi_probe(struct platform_device *pdev)
{
	struct Scsi_Host *instance;
	struct NCR5380_hostdata *hostdata;
	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;

	pdma_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);

	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;

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

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

	hostdata = shost_priv(instance);
	hostdata->base = pio_mem->start;
	hostdata->io = (u8 __iomem *)pio_mem->start;

	if (pdma_mem && setup_use_pdma)
		hostdata->pdma_io = (u8 __iomem *)pdma_mem->start;
	else
		host_flags |= FLAG_NO_PSEUDO_DMA;

	host_flags |= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0;

	error = NCR5380_init(instance, host_flags | FLAG_LATE_DMA_SETUP);
	if (error)
		goto fail_init;

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

	NCR5380_maybe_reset_bus(instance);

	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);
fail_init:
	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	*
71c204ad FT	6	* Copyright 2019 Finn Thain
71c204ad FT	7	*
1da177e4 LT	8	* derived in part from:
	9	*/
	10	/*
	11	* Generic Generic NCR5380 driver
	12	*
	13	* Copyright 1995, Russell King
1da177e4 LT	14	*/
1da177e4 LT	15
71c204ad	16	#include <linux/delay.h>
1da177e4	17	#include <linux/types.h>
1da177e4	18	#include <linux/module.h>
1da177e4 LT	19	#include <linux/ioport.h>
	20	#include <linux/init.h>
	21	#include <linux/blkdev.h>
	22	#include <linux/interrupt.h>
cbad48de	23	#include <linux/platform_device.h>
1da177e4	24
cbad48de	25	#include <asm/hwtest.h>
1da177e4	26	#include <asm/io.h>
1da177e4	27	#include <asm/macints.h>
cbad48de	28	#include <asm/setup.h>
1da177e4	29
1da177e4	30	#include <scsi/scsi_host.h>
92de3831 FT	31
92de3831 FT	32	/* Definitions for the core NCR5380 driver. */
e744fdea	33
820682b1	34	#define NCR5380_implementation_fields int pdma_residual
92de3831	35
61e1ce58 FT	36	#define NCR5380_read(reg) in_8(hostdata->io + ((reg) << 4))
61e1ce58 FT	37	#define NCR5380_write(reg, value) out_8(hostdata->io + ((reg) << 4), value)
92de3831	38
4a98f896	39	#define NCR5380_dma_xfer_len macscsi_dma_xfer_len
6c4b88ca FT	40	#define NCR5380_dma_recv_setup macscsi_pread
6c4b88ca FT	41	#define NCR5380_dma_send_setup macscsi_pwrite
4a98f896	42	#define NCR5380_dma_residual macscsi_dma_residual
92de3831 FT	43
	44	#define NCR5380_intr macscsi_intr
	45	#define NCR5380_queue_command macscsi_queue_command
	46	#define NCR5380_abort macscsi_abort
12e5fc66	47	#define NCR5380_host_reset macscsi_host_reset
92de3831	48	#define NCR5380_info macscsi_info
92de3831	49
1da177e4 LT	50	#include "NCR5380.h"
1da177e4 LT	51
1da177e4	52	static int setup_can_queue = -1;
6e9ae6d5	53	module_param(setup_can_queue, int, 0);
1da177e4	54	static int setup_cmd_per_lun = -1;
6e9ae6d5	55	module_param(setup_cmd_per_lun, int, 0);
1da177e4	56	static int setup_sg_tablesize = -1;
6e9ae6d5	57	module_param(setup_sg_tablesize, int, 0);
4553b6a5	58	static int setup_use_pdma = 512;
6e9ae6d5	59	module_param(setup_use_pdma, int, 0);
1da177e4	60	static int setup_hostid = -1;
6e9ae6d5	61	module_param(setup_hostid, int, 0);
9c3f0e2b FT	62	static int setup_toshiba_delay = -1;
9c3f0e2b FT	63	module_param(setup_toshiba_delay, int, 0);
1da177e4	64
6e9ae6d5 FT	65	#ifndef MODULE
	66	static int __init mac_scsi_setup(char *str)
	67	{
9c3f0e2b	68	int ints[8];
6e9ae6d5 FT	69
	70	(void)get_options(str, ARRAY_SIZE(ints), ints);
	71
9c3f0e2b FT	72	if (ints[0] < 1) {
9c3f0e2b FT	73	pr_err("Usage: mac5380=<can_queue>[,<cmd_per_lun>[,<sg_tablesize>[,<hostid>[,<use_tags>[,<use_pdma>[,<toshiba_delay>]]]]]]\n");
6e9ae6d5	74	return 0;
1da177e4	75	}
6e9ae6d5 FT	76	if (ints[0] >= 1)
	77	setup_can_queue = ints[1];
	78	if (ints[0] >= 2)
	79	setup_cmd_per_lun = ints[2];
	80	if (ints[0] >= 3)
	81	setup_sg_tablesize = ints[3];
	82	if (ints[0] >= 4)
	83	setup_hostid = ints[4];
c4ec6f92	84	/* ints[5] (use_tagged_queuing) is ignored */
6e9ae6d5	85	if (ints[0] >= 6)
1da177e4	86	setup_use_pdma = ints[6];
9c3f0e2b FT	87	if (ints[0] >= 7)
9c3f0e2b FT	88	setup_toshiba_delay = ints[7];
1da177e4 LT	89	return 1;
	90	}
	91
	92	__setup("mac5380=", mac_scsi_setup);
6e9ae6d5	93	#endif /* !MODULE */
1da177e4	94
71c204ad FT	95	/*
	96	* According to "Inside Macintosh: Devices", Mac OS requires disk drivers to
	97	* specify the number of bytes between the delays expected from a SCSI target.
	98	* This allows the operating system to "prevent bus errors when a target fails
	99	* to deliver the next byte within the processor bus error timeout period."
	100	* Linux SCSI drivers lack knowledge of the timing behaviour of SCSI targets
	101	* so bus errors are unavoidable.
	102	*
	103	* If a MOVE.B instruction faults, we assume that zero bytes were transferred
	104	* and simply retry. That assumption probably depends on target behaviour but
	105	* seems to hold up okay. The NOP provides synchronization: without it the
	106	* fault can sometimes occur after the program counter has moved past the
	107	* offending instruction. Post-increment addressing can't be used.
	108	*/
	109
	110	#define MOVE_BYTE(operands) \
	111	asm volatile ( \
	112	"1: moveb " operands " \n" \
	113	"11: nop \n" \
	114	" addq #1,%0 \n" \
	115	" subq #1,%1 \n" \
	116	"40: \n" \
	117	" \n" \
	118	".section .fixup,\"ax\" \n" \
	119	".even \n" \
	120	"90: movel #1, %2 \n" \
	121	" jra 40b \n" \
	122	".previous \n" \
	123	" \n" \
	124	".section __ex_table,\"a\" \n" \
	125	".align 4 \n" \
	126	".long 1b,90b \n" \
	127	".long 11b,90b \n" \
	128	".previous \n" \
	129	: "+a" (addr), "+r" (n), "+r" (result) : "a" (io))
	130
	131	/*
	132	* If a MOVE.W (or MOVE.L) instruction faults, it cannot be retried because
	133	* the residual byte count would be uncertain. In that situation the MOVE_WORD
	134	* macro clears n in the fixup section to abort the transfer.
	135	*/
	136
	137	#define MOVE_WORD(operands) \
	138	asm volatile ( \
	139	"1: movew " operands " \n" \
	140	"11: nop \n" \
	141	" subq #2,%1 \n" \
	142	"40: \n" \
	143	" \n" \
	144	".section .fixup,\"ax\" \n" \
	145	".even \n" \
	146	"90: movel #0, %1 \n" \
	147	" movel #2, %2 \n" \
	148	" jra 40b \n" \
	149	".previous \n" \
	150	" \n" \
	151	".section __ex_table,\"a\" \n" \
	152	".align 4 \n" \
	153	".long 1b,90b \n" \
	154	".long 11b,90b \n" \
	155	".previous \n" \
	156	: "+a" (addr), "+r" (n), "+r" (result) : "a" (io))
	157
	158	#define MOVE_16_WORDS(operands) \
159	asm volatile ( \
160	"1: movew " operands " \n" \
161	"2: movew " operands " \n" \
162	"3: movew " operands " \n" \
163	"4: movew " operands " \n" \
164	"5: movew " operands " \n" \
165	"6: movew " operands " \n" \
166	"7: movew " operands " \n" \
167	"8: movew " operands " \n" \
168	"9: movew " operands " \n" \
169	"10: movew " operands " \n" \
170	"11: movew " operands " \n" \
171	"12: movew " operands " \n" \
172	"13: movew " operands " \n" \
173	"14: movew " operands " \n" \
174	"15: movew " operands " \n" \
175	"16: movew " operands " \n" \
176	"17: nop \n" \
177	" subl #32,%1 \n" \
178	"40: \n" \
179	" \n" \
180	".section .fixup,\"ax\" \n" \
181	".even \n" \
182	"90: movel #0, %1 \n" \
183	" movel #2, %2 \n" \
184	" jra 40b \n" \
185	".previous \n" \
186	" \n" \
187	".section __ex_table,\"a\" \n" \
188	".align 4 \n" \
189	".long 1b,90b \n" \
190	".long 2b,90b \n" \
191	".long 3b,90b \n" \
192	".long 4b,90b \n" \
193	".long 5b,90b \n" \
194	".long 6b,90b \n" \
195	".long 7b,90b \n" \
196	".long 8b,90b \n" \
197	".long 9b,90b \n" \
198	".long 10b,90b \n" \
199	".long 11b,90b \n" \
200	".long 12b,90b \n" \
201	".long 13b,90b \n" \
202	".long 14b,90b \n" \
203	".long 15b,90b \n" \
204	".long 16b,90b \n" \
205	".long 17b,90b \n" \
206	".previous \n" \
207	: "+a" (addr), "+r" (n), "+r" (result) : "a" (io))
208
209	#define MAC_PDMA_DELAY 32
210
211	static inline int mac_pdma_recv(void __iomem io, unsigned char start, int n)
212	{
213	unsigned char *addr = start;
214	int result = 0;
215
216	if (n >= 1) {
217	MOVE_BYTE("%3@,%0@");
218	if (result)
219	goto out;
220	}
221	if (n >= 1 && ((unsigned long)addr & 1)) {
222	MOVE_BYTE("%3@,%0@");
223	if (result)
224	goto out;
225	}
226	while (n >= 32)
227	MOVE_16_WORDS("%3@,%0@+");
228	while (n >= 2)
229	MOVE_WORD("%3@,%0@+");
230	if (result)
231	return start - addr; /* Negated to indicate uncertain length */
232	if (n == 1)
233	MOVE_BYTE("%3@,%0@");
234	out:
235	return addr - start;
236	}
237
238	static inline int mac_pdma_send(unsigned char start, void __iomem io, int n)
239	{
240	unsigned char *addr = start;
241	int result = 0;
242
243	if (n >= 1) {
244	MOVE_BYTE("%0@,%3@");
245	if (result)
246	goto out;
247	}
248	if (n >= 1 && ((unsigned long)addr & 1)) {
249	MOVE_BYTE("%0@,%3@");
250	if (result)
251	goto out;
252	}
253	while (n >= 32)
254	MOVE_16_WORDS("%0@+,%3@");
255	while (n >= 2)
256	MOVE_WORD("%0@+,%3@");
257	if (result)
258	return start - addr; /* Negated to indicate uncertain length */
259	if (n == 1)
260	MOVE_BYTE("%0@,%3@");
261	out:
262	return addr - start;
263	}
1da177e4	264
4a98f896 FT	265	static inline int macscsi_pread(struct NCR5380_hostdata *hostdata,
4a98f896 FT	266	unsigned char *dst, int len)
1da177e4	267	{
4ab2a787	268	u8 __iomem *s = hostdata->pdma_io + (INPUT_DATA_REG << 4);
3a0f64bf	269	unsigned char *d = dst;
71c204ad FT	270
71c204ad FT	271	hostdata->pdma_residual = len;
3a0f64bf	272
d5d37a0a	273	while (!NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG,
3a0f64bf FT	274	BASR_DRQ \| BASR_PHASE_MATCH,
3a0f64bf FT	275	BASR_DRQ \| BASR_PHASE_MATCH, HZ / 64)) {
71c204ad	276	int bytes;
3a0f64bf	277
71c204ad	278	bytes = mac_pdma_recv(s, d, min(hostdata->pdma_residual, 512));
3a0f64bf	279
71c204ad FT	280	if (bytes > 0) {
	281	d += bytes;
	282	hostdata->pdma_residual -= bytes;
	283	}
	284
	285	if (hostdata->pdma_residual == 0)
3a0f64bf FT	286	return 0;
3a0f64bf FT	287
d5d37a0a	288	if (NCR5380_poll_politely2(hostdata, STATUS_REG, SR_REQ, SR_REQ,
71c204ad FT	289	BUS_AND_STATUS_REG, BASR_ACK,
	290	BASR_ACK, HZ / 64) < 0)
	291	scmd_printk(KERN_DEBUG, hostdata->connected,
3a0f64bf FT	292	"%s: !REQ and !ACK\n", __func__);
	293	if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH))
	294	return 0;
	295
71c204ad FT	296	if (bytes == 0)
	297	udelay(MAC_PDMA_DELAY);
	298
	299	if (bytes >= 0)
	300	continue;
	301
4a98f896	302	dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host,
71c204ad	303	"%s: bus error (%d/%d)\n", __func__, d - dst, len);
4a98f896	304	NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
71c204ad	305	return -1;
ffdede67 FT	306	}
ffdede67 FT	307
3a0f64bf FT	308	scmd_printk(KERN_ERR, hostdata->connected,
3a0f64bf FT	309	"%s: phase mismatch or !DRQ\n", __func__);
4a98f896	310	NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
3a0f64bf	311	return -1;
1da177e4 LT	312	}
1da177e4 LT	313
4a98f896 FT	314	static inline int macscsi_pwrite(struct NCR5380_hostdata *hostdata,
4a98f896 FT	315	unsigned char *src, int len)
1da177e4	316	{
3a0f64bf	317	unsigned char *s = src;
4ab2a787	318	u8 __iomem *d = hostdata->pdma_io + (OUTPUT_DATA_REG << 4);
71c204ad FT	319
71c204ad FT	320	hostdata->pdma_residual = len;
3a0f64bf	321
d5d37a0a	322	while (!NCR5380_poll_politely(hostdata, BUS_AND_STATUS_REG,
3a0f64bf FT	323	BASR_DRQ \| BASR_PHASE_MATCH,
3a0f64bf FT	324	BASR_DRQ \| BASR_PHASE_MATCH, HZ / 64)) {
71c204ad	325	int bytes;
3a0f64bf	326
71c204ad	327	bytes = mac_pdma_send(s, d, min(hostdata->pdma_residual, 512));
3a0f64bf	328
71c204ad FT	329	if (bytes > 0) {
	330	s += bytes;
	331	hostdata->pdma_residual -= bytes;
	332	}
3a0f64bf	333
71c204ad	334	if (hostdata->pdma_residual == 0) {
d5d37a0a	335	if (NCR5380_poll_politely(hostdata, TARGET_COMMAND_REG,
3a0f64bf FT	336	TCR_LAST_BYTE_SENT,
	337	TCR_LAST_BYTE_SENT, HZ / 64) < 0)
	338	scmd_printk(KERN_ERR, hostdata->connected,
	339	"%s: Last Byte Sent timeout\n", __func__);
	340	return 0;
	341	}
	342
71c204ad FT	343	if (NCR5380_poll_politely2(hostdata, STATUS_REG, SR_REQ, SR_REQ,
	344	BUS_AND_STATUS_REG, BASR_ACK,
	345	BASR_ACK, HZ / 64) < 0)
	346	scmd_printk(KERN_DEBUG, hostdata->connected,
	347	"%s: !REQ and !ACK\n", __func__);
	348	if (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH))
	349	return 0;
	350
	351	if (bytes == 0)
	352	udelay(MAC_PDMA_DELAY);
	353
	354	if (bytes >= 0)
	355	continue;
	356
4a98f896	357	dsprintk(NDEBUG_PSEUDO_DMA, hostdata->host,
71c204ad	358	"%s: bus error (%d/%d)\n", __func__, s - src, len);
4a98f896	359	NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
71c204ad	360	return -1;
ffdede67 FT	361	}
ffdede67 FT	362
3a0f64bf FT	363	scmd_printk(KERN_ERR, hostdata->connected,
3a0f64bf FT	364	"%s: phase mismatch or !DRQ\n", __func__);
4a98f896	365	NCR5380_dprint(NDEBUG_PSEUDO_DMA, hostdata->host);
3a0f64bf	366	return -1;
ffdede67	367	}
1da177e4	368
4a98f896	369	static int macscsi_dma_xfer_len(struct NCR5380_hostdata *hostdata,
7e9ec8d9 FT	370	struct scsi_cmnd *cmd)
7e9ec8d9 FT	371	{
3a0f64bf	372	if (hostdata->flags & FLAG_NO_PSEUDO_DMA \|\|
4553b6a5	373	cmd->SCp.this_residual < setup_use_pdma)
7e9ec8d9 FT	374	return 0;
7e9ec8d9 FT	375
3a0f64bf	376	return cmd->SCp.this_residual;
7e9ec8d9 FT	377	}
7e9ec8d9 FT	378
4a98f896 FT	379	static int macscsi_dma_residual(struct NCR5380_hostdata *hostdata)
	380	{
	381	return hostdata->pdma_residual;
	382	}
	383
1da177e4 LT	384	#include "NCR5380.c"
1da177e4 LT	385
cbad48de FT	386	#define DRV_MODULE_NAME "mac_scsi"
	387	#define PFX DRV_MODULE_NAME ": "
	388
	389	static struct scsi_host_template mac_scsi_template = {
aa2e2cb1 FT	390	.module = THIS_MODULE,
aa2e2cb1 FT	391	.proc_name = DRV_MODULE_NAME,
aa2e2cb1 FT	392	.name = "Macintosh NCR5380 SCSI",
	393	.info = macscsi_info,
	394	.queuecommand = macscsi_queue_command,
	395	.eh_abort_handler = macscsi_abort,
12e5fc66	396	.eh_host_reset_handler = macscsi_host_reset,
aa2e2cb1 FT	397	.can_queue = 16,
aa2e2cb1 FT	398	.this_id = 7,
3a0f64bf	399	.sg_tablesize = 1,
aa2e2cb1 FT	400	.cmd_per_lun = 2,
aa2e2cb1 FT	401	.use_clustering = DISABLE_CLUSTERING,
32b26a10	402	.cmd_size = NCR5380_CMD_SIZE,
0a4e3612	403	.max_sectors = 128,
1da177e4 LT	404	};
1da177e4 LT	405
cbad48de FT	406	static int __init mac_scsi_probe(struct platform_device *pdev)
	407	{
	408	struct Scsi_Host *instance;
820682b1	409	struct NCR5380_hostdata *hostdata;
cbad48de FT	410	int error;
	411	int host_flags = 0;
	412	struct resource irq, pio_mem, *pdma_mem = NULL;
	413
	414	pio_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	415	if (!pio_mem)
	416	return -ENODEV;
	417
cbad48de	418	pdma_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
cbad48de FT	419
	420	irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
	421
	422	if (!hwreg_present((unsigned char *)pio_mem->start +
	423	(STATUS_REG << 4))) {
	424	pr_info(PFX "no device detected at %pap\n", &pio_mem->start);
	425	return -ENODEV;
	426	}
	427
	428	if (setup_can_queue > 0)
	429	mac_scsi_template.can_queue = setup_can_queue;
	430	if (setup_cmd_per_lun > 0)
	431	mac_scsi_template.cmd_per_lun = setup_cmd_per_lun;
	432	if (setup_sg_tablesize >= 0)
	433	mac_scsi_template.sg_tablesize = setup_sg_tablesize;
	434	if (setup_hostid >= 0)
	435	mac_scsi_template.this_id = setup_hostid & 7;
cbad48de FT	436
	437	instance = scsi_host_alloc(&mac_scsi_template,
	438	sizeof(struct NCR5380_hostdata));
	439	if (!instance)
	440	return -ENOMEM;
	441
cbad48de FT	442	if (irq)
	443	instance->irq = irq->start;
	444	else
	445	instance->irq = NO_IRQ;
	446
820682b1 FT	447	hostdata = shost_priv(instance);
820682b1 FT	448	hostdata->base = pio_mem->start;
4ab2a787	449	hostdata->io = (u8 __iomem *)pio_mem->start;
cbad48de	450
820682b1	451	if (pdma_mem && setup_use_pdma)
4ab2a787	452	hostdata->pdma_io = (u8 __iomem *)pdma_mem->start;
820682b1	453	else
cbad48de FT	454	host_flags \|= FLAG_NO_PSEUDO_DMA;
cbad48de FT	455
9c3f0e2b	456	host_flags \|= setup_toshiba_delay > 0 ? FLAG_TOSHIBA_DELAY : 0;
ca513fc9	457
8053b0ee	458	error = NCR5380_init(instance, host_flags \| FLAG_LATE_DMA_SETUP);
0ad0eff9 FT	459	if (error)
0ad0eff9 FT	460	goto fail_init;
cbad48de FT	461
	462	if (instance->irq != NO_IRQ) {
	463	error = request_irq(instance->irq, macscsi_intr, IRQF_SHARED,
	464	"NCR5380", instance);
	465	if (error)
	466	goto fail_irq;
	467	}
	468
9c3f0e2b FT	469	NCR5380_maybe_reset_bus(instance);
9c3f0e2b FT	470
cbad48de FT	471	error = scsi_add_host(instance, NULL);
	472	if (error)
	473	goto fail_host;
	474
	475	platform_set_drvdata(pdev, instance);
	476
	477	scsi_scan_host(instance);
	478	return 0;
	479
	480	fail_host:
	481	if (instance->irq != NO_IRQ)
	482	free_irq(instance->irq, instance);
	483	fail_irq:
	484	NCR5380_exit(instance);
0ad0eff9	485	fail_init:
cbad48de FT	486	scsi_host_put(instance);
	487	return error;
	488	}
	489
	490	static int __exit mac_scsi_remove(struct platform_device *pdev)
	491	{
	492	struct Scsi_Host *instance = platform_get_drvdata(pdev);
	493
	494	scsi_remove_host(instance);
	495	if (instance->irq != NO_IRQ)
	496	free_irq(instance->irq, instance);
	497	NCR5380_exit(instance);
	498	scsi_host_put(instance);
	499	return 0;
	500	}
	501
	502	static struct platform_driver mac_scsi_driver = {
	503	.remove = __exit_p(mac_scsi_remove),
	504	.driver = {
	505	.name = DRV_MODULE_NAME,
cbad48de FT	506	},
cbad48de FT	507	};
1da177e4	508
cbad48de	509	module_platform_driver_probe(mac_scsi_driver, mac_scsi_probe);
6e9ae6d5	510
cbad48de	511	MODULE_ALIAS("platform:" DRV_MODULE_NAME);
6e9ae6d5	512	MODULE_LICENSE("GPL");