[net-next-2.6.git] / drivers / scsi / a3000.c

#include <linux/types.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>

#include <asm/setup.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/amigaints.h>
#include <asm/amigahw.h>
#include <asm/irq.h>

#include "scsi.h"
#include <scsi/scsi_host.h>
#include "wd33c93.h"
#include "a3000.h"

#include<linux/stat.h>

#define DMA(ptr) ((a3000_scsiregs *)((ptr)->base))
#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))

static struct Scsi_Host *a3000_host = NULL;

static int a3000_release(struct Scsi_Host *instance);

static irqreturn_t a3000_intr (int irq, void *dummy)
{
	unsigned long flags;
	unsigned int status = DMA(a3000_host)->ISTR;

	if (!(status & ISTR_INT_P))
		return IRQ_NONE;
	if (status & ISTR_INTS)
	{
		spin_lock_irqsave(a3000_host->host_lock, flags);
		wd33c93_intr (a3000_host);
		spin_unlock_irqrestore(a3000_host->host_lock, flags);
		return IRQ_HANDLED;
	}
	printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
	return IRQ_NONE;
}

static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
{
    unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
    unsigned long addr = virt_to_bus(cmd->SCp.ptr);

    /*
     * if the physical address has the wrong alignment, or if
     * physical address is bad, or if it is a write and at the
     * end of a physical memory chunk, then allocate a bounce
     * buffer
     */
    if (addr & A3000_XFER_MASK)
    {
	HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
	    & ~0x1ff;
	HDATA(a3000_host)->dma_bounce_buffer =
	    kmalloc (HDATA(a3000_host)->dma_bounce_len, GFP_KERNEL);
	
	/* can't allocate memory; use PIO */
	if (!HDATA(a3000_host)->dma_bounce_buffer) {
	    HDATA(a3000_host)->dma_bounce_len = 0;
	    return 1;
	}

	if (!dir_in) {
	    /* copy to bounce buffer for a write */
	    memcpy (HDATA(a3000_host)->dma_bounce_buffer,
		cmd->SCp.ptr, cmd->SCp.this_residual);
	}

	addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
    }

    /* setup dma direction */
    if (!dir_in)
	cntr |= CNTR_DDIR;

    /* remember direction */
    HDATA(a3000_host)->dma_dir = dir_in;

    DMA(a3000_host)->CNTR = cntr;

    /* setup DMA *physical* address */
    DMA(a3000_host)->ACR = addr;

    if (dir_in)
  	/* invalidate any cache */
	cache_clear (addr, cmd->SCp.this_residual);
    else
	/* push any dirty cache */
	cache_push (addr, cmd->SCp.this_residual);

    /* start DMA */
    mb();			/* make sure setup is completed */
    DMA(a3000_host)->ST_DMA = 1;
    mb();			/* make sure DMA has started before next IO */

    /* return success */
    return 0;
}

static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
		     int status)
{
    /* disable SCSI interrupts */
    unsigned short cntr = CNTR_PDMD;

    if (!HDATA(instance)->dma_dir)
	cntr |= CNTR_DDIR;

    DMA(instance)->CNTR = cntr;
    mb();			/* make sure CNTR is updated before next IO */

    /* flush if we were reading */
    if (HDATA(instance)->dma_dir) {
	DMA(instance)->FLUSH = 1;
	mb();			/* don't allow prefetch */
	while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
	    barrier();
	mb();			/* no IO until FLUSH is done */
    }

    /* clear a possible interrupt */
    /* I think that this CINT is only necessary if you are
     * using the terminal count features.   HM 7 Mar 1994
     */
    DMA(instance)->CINT = 1;

    /* stop DMA */
    DMA(instance)->SP_DMA = 1;
    mb();			/* make sure DMA is stopped before next IO */

    /* restore the CONTROL bits (minus the direction flag) */
    DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
    mb();			/* make sure CNTR is updated before next IO */

    /* copy from a bounce buffer, if necessary */
    if (status && HDATA(instance)->dma_bounce_buffer) {
	if (SCpnt) {
	    if (HDATA(instance)->dma_dir && SCpnt)
		memcpy (SCpnt->SCp.ptr,
			HDATA(instance)->dma_bounce_buffer,
			SCpnt->SCp.this_residual);
	    kfree (HDATA(instance)->dma_bounce_buffer);
	    HDATA(instance)->dma_bounce_buffer = NULL;
	    HDATA(instance)->dma_bounce_len = 0;
	} else {
	    kfree (HDATA(instance)->dma_bounce_buffer);
	    HDATA(instance)->dma_bounce_buffer = NULL;
	    HDATA(instance)->dma_bounce_len = 0;
	}
    }
}

static int __init a3000_detect(struct scsi_host_template *tpnt)
{
    wd33c93_regs regs;

    if  (!MACH_IS_AMIGA || !AMIGAHW_PRESENT(A3000_SCSI))
	return 0;
    if (!request_mem_region(0xDD0000, 256, "wd33c93"))
	return 0;

    tpnt->proc_name = "A3000";
    tpnt->proc_info = &wd33c93_proc_info;

    a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
    if (a3000_host == NULL)
	goto fail_register;

    a3000_host->base = ZTWO_VADDR(0xDD0000);
    a3000_host->irq = IRQ_AMIGA_PORTS;
    DMA(a3000_host)->DAWR = DAWR_A3000;
    regs.SASR = &(DMA(a3000_host)->SASR);
    regs.SCMD = &(DMA(a3000_host)->SCMD);
    HDATA(a3000_host)->no_sync = 0xff;
    HDATA(a3000_host)->fast = 0;
    HDATA(a3000_host)->dma_mode = CTRL_DMA;
    wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
    if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI",
		    a3000_intr))
        goto fail_irq;
    DMA(a3000_host)->CNTR = CNTR_PDMD | CNTR_INTEN;

    return 1;

fail_irq:
    wd33c93_release();
    scsi_unregister(a3000_host);
fail_register:
    release_mem_region(0xDD0000, 256);
    return 0;
}

static int a3000_bus_reset(struct scsi_cmnd *cmd)
{
	/* FIXME perform bus-specific reset */
	
	/* FIXME 2: kill this entire function, which should
	   cause mid-layer to call wd33c93_host_reset anyway? */

	spin_lock_irq(cmd->device->host->host_lock);
	wd33c93_host_reset(cmd);
	spin_unlock_irq(cmd->device->host->host_lock);

	return SUCCESS;
}

#define HOSTS_C

static struct scsi_host_template driver_template = {
	.proc_name		= "A3000",
	.name			= "Amiga 3000 built-in SCSI",
	.detect			= a3000_detect,
	.release		= a3000_release,
	.queuecommand		= wd33c93_queuecommand,
	.eh_abort_handler	= wd33c93_abort,
	.eh_bus_reset_handler	= a3000_bus_reset,
	.eh_host_reset_handler	= wd33c93_host_reset,
	.can_queue		= CAN_QUEUE,
	.this_id		= 7,
	.sg_tablesize		= SG_ALL,
	.cmd_per_lun		= CMD_PER_LUN,
	.use_clustering		= ENABLE_CLUSTERING
};


#include "scsi_module.c"

static int a3000_release(struct Scsi_Host *instance)
{
    wd33c93_release();
    DMA(instance)->CNTR = 0;
    release_mem_region(0xDD0000, 256);
    free_irq(IRQ_AMIGA_PORTS, a3000_intr);
    return 1;
}

MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	#include <linux/types.h>
1da177e4 LT	2	#include <linux/mm.h>
5a0e3ad6	3	#include <linux/slab.h>
1da177e4	4	#include <linux/blkdev.h>
1da177e4 LT	5	#include <linux/ioport.h>
	6	#include <linux/init.h>
	7	#include <linux/spinlock.h>
	8	#include <linux/interrupt.h>
	9
	10	#include <asm/setup.h>
	11	#include <asm/page.h>
	12	#include <asm/pgtable.h>
	13	#include <asm/amigaints.h>
	14	#include <asm/amigahw.h>
	15	#include <asm/irq.h>
	16
	17	#include "scsi.h"
	18	#include <scsi/scsi_host.h>
	19	#include "wd33c93.h"
	20	#include "a3000.h"
	21
	22	#include<linux/stat.h>
	23
	24	#define DMA(ptr) ((a3000_scsiregs *)((ptr)->base))
	25	#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
	26
	27	static struct Scsi_Host *a3000_host = NULL;
	28
9387edbe AB	29	static int a3000_release(struct Scsi_Host *instance);
9387edbe AB	30
7d12e780	31	static irqreturn_t a3000_intr (int irq, void *dummy)
1da177e4 LT	32	{
	33	unsigned long flags;
	34	unsigned int status = DMA(a3000_host)->ISTR;
	35
	36	if (!(status & ISTR_INT_P))
	37	return IRQ_NONE;
	38	if (status & ISTR_INTS)
	39	{
	40	spin_lock_irqsave(a3000_host->host_lock, flags);
	41	wd33c93_intr (a3000_host);
	42	spin_unlock_irqrestore(a3000_host->host_lock, flags);
	43	return IRQ_HANDLED;
	44	}
	45	printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
	46	return IRQ_NONE;
	47	}
	48
65396410	49	static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
1da177e4 LT	50	{
	51	unsigned short cntr = CNTR_PDMD \| CNTR_INTEN;
	52	unsigned long addr = virt_to_bus(cmd->SCp.ptr);
	53
	54	/*
	55	* if the physical address has the wrong alignment, or if
	56	* physical address is bad, or if it is a write and at the
	57	* end of a physical memory chunk, then allocate a bounce
	58	* buffer
	59	*/
7b892806	60	if (addr & A3000_XFER_MASK)
1da177e4 LT	61	{
	62	HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
	63	& ~0x1ff;
	64	HDATA(a3000_host)->dma_bounce_buffer =
	65	kmalloc (HDATA(a3000_host)->dma_bounce_len, GFP_KERNEL);
	66
	67	/* can't allocate memory; use PIO */
	68	if (!HDATA(a3000_host)->dma_bounce_buffer) {
	69	HDATA(a3000_host)->dma_bounce_len = 0;
	70	return 1;
	71	}
	72
	73	if (!dir_in) {
	74	/* copy to bounce buffer for a write */
cc0455fa BH	75	memcpy (HDATA(a3000_host)->dma_bounce_buffer,
cc0455fa BH	76	cmd->SCp.ptr, cmd->SCp.this_residual);
1da177e4 LT	77	}
	78
	79	addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
	80	}
	81
	82	/* setup dma direction */
	83	if (!dir_in)
	84	cntr \|= CNTR_DDIR;
	85
	86	/* remember direction */
	87	HDATA(a3000_host)->dma_dir = dir_in;
	88
	89	DMA(a3000_host)->CNTR = cntr;
	90
	91	/* setup DMA physical address */
	92	DMA(a3000_host)->ACR = addr;
	93
	94	if (dir_in)
	95	/* invalidate any cache */
	96	cache_clear (addr, cmd->SCp.this_residual);
	97	else
	98	/* push any dirty cache */
	99	cache_push (addr, cmd->SCp.this_residual);
	100
	101	/* start DMA */
	102	mb(); /* make sure setup is completed */
	103	DMA(a3000_host)->ST_DMA = 1;
	104	mb(); /* make sure DMA has started before next IO */
	105
	106	/* return success */
	107	return 0;
	108	}
	109
65396410 HK	110	static void dma_stop(struct Scsi_Host instance, struct scsi_cmnd SCpnt,
65396410 HK	111	int status)
1da177e4 LT	112	{
	113	/* disable SCSI interrupts */
	114	unsigned short cntr = CNTR_PDMD;
	115
	116	if (!HDATA(instance)->dma_dir)
	117	cntr \|= CNTR_DDIR;
	118
	119	DMA(instance)->CNTR = cntr;
	120	mb(); /* make sure CNTR is updated before next IO */
	121
	122	/* flush if we were reading */
	123	if (HDATA(instance)->dma_dir) {
	124	DMA(instance)->FLUSH = 1;
	125	mb(); /* don't allow prefetch */
	126	while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
	127	barrier();
	128	mb(); /* no IO until FLUSH is done */
	129	}
	130
	131	/* clear a possible interrupt */
	132	/* I think that this CINT is only necessary if you are
	133	* using the terminal count features. HM 7 Mar 1994
	134	*/
	135	DMA(instance)->CINT = 1;
	136
	137	/* stop DMA */
	138	DMA(instance)->SP_DMA = 1;
	139	mb(); /* make sure DMA is stopped before next IO */
	140
	141	/* restore the CONTROL bits (minus the direction flag) */
	142	DMA(instance)->CNTR = CNTR_PDMD \| CNTR_INTEN;
	143	mb(); /* make sure CNTR is updated before next IO */
	144
	145	/* copy from a bounce buffer, if necessary */
	146	if (status && HDATA(instance)->dma_bounce_buffer) {
cc0455fa	147	if (SCpnt) {
1da177e4 LT	148	if (HDATA(instance)->dma_dir && SCpnt)
	149	memcpy (SCpnt->SCp.ptr,
	150	HDATA(instance)->dma_bounce_buffer,
	151	SCpnt->SCp.this_residual);
	152	kfree (HDATA(instance)->dma_bounce_buffer);
	153	HDATA(instance)->dma_bounce_buffer = NULL;
	154	HDATA(instance)->dma_bounce_len = 0;
	155	} else {
1da177e4 LT	156	kfree (HDATA(instance)->dma_bounce_buffer);
	157	HDATA(instance)->dma_bounce_buffer = NULL;
	158	HDATA(instance)->dma_bounce_len = 0;
	159	}
	160	}
	161	}
	162
9387edbe	163	static int __init a3000_detect(struct scsi_host_template *tpnt)
1da177e4 LT	164	{
	165	wd33c93_regs regs;
	166
	167	if (!MACH_IS_AMIGA \|\| !AMIGAHW_PRESENT(A3000_SCSI))
	168	return 0;
	169	if (!request_mem_region(0xDD0000, 256, "wd33c93"))
	170	return 0;
	171
	172	tpnt->proc_name = "A3000";
	173	tpnt->proc_info = &wd33c93_proc_info;
	174
	175	a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
	176	if (a3000_host == NULL)
	177	goto fail_register;
	178
	179	a3000_host->base = ZTWO_VADDR(0xDD0000);
	180	a3000_host->irq = IRQ_AMIGA_PORTS;
	181	DMA(a3000_host)->DAWR = DAWR_A3000;
	182	regs.SASR = &(DMA(a3000_host)->SASR);
	183	regs.SCMD = &(DMA(a3000_host)->SCMD);
be3cb3d8 TB	184	HDATA(a3000_host)->no_sync = 0xff;
	185	HDATA(a3000_host)->fast = 0;
	186	HDATA(a3000_host)->dma_mode = CTRL_DMA;
1da177e4	187	wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
1d6f359a	188	if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI",
1da177e4 LT	189	a3000_intr))
	190	goto fail_irq;
	191	DMA(a3000_host)->CNTR = CNTR_PDMD \| CNTR_INTEN;
	192
	193	return 1;
	194
	195	fail_irq:
	196	wd33c93_release();
	197	scsi_unregister(a3000_host);
	198	fail_register:
	199	release_mem_region(0xDD0000, 256);
	200	return 0;
	201	}
	202
65396410	203	static int a3000_bus_reset(struct scsi_cmnd *cmd)
1da177e4 LT	204	{
1da177e4 LT	205	/* FIXME perform bus-specific reset */
df0ae249 JG	206
	207	/* FIXME 2: kill this entire function, which should
	208	cause mid-layer to call wd33c93_host_reset anyway? */
68b3aa7c JG	209
68b3aa7c JG	210	spin_lock_irq(cmd->device->host->host_lock);
1da177e4	211	wd33c93_host_reset(cmd);
68b3aa7c JG	212	spin_unlock_irq(cmd->device->host->host_lock);
68b3aa7c JG	213
1da177e4 LT	214	return SUCCESS;
	215	}
	216
	217	#define HOSTS_C
	218
d0be4a7d	219	static struct scsi_host_template driver_template = {
1da177e4 LT	220	.proc_name = "A3000",
	221	.name = "Amiga 3000 built-in SCSI",
	222	.detect = a3000_detect,
	223	.release = a3000_release,
	224	.queuecommand = wd33c93_queuecommand,
	225	.eh_abort_handler = wd33c93_abort,
	226	.eh_bus_reset_handler = a3000_bus_reset,
	227	.eh_host_reset_handler = wd33c93_host_reset,
	228	.can_queue = CAN_QUEUE,
	229	.this_id = 7,
	230	.sg_tablesize = SG_ALL,
	231	.cmd_per_lun = CMD_PER_LUN,
	232	.use_clustering = ENABLE_CLUSTERING
	233	};
	234
	235
	236	#include "scsi_module.c"
	237
9387edbe	238	static int a3000_release(struct Scsi_Host *instance)
1da177e4 LT	239	{
	240	wd33c93_release();
	241	DMA(instance)->CNTR = 0;
	242	release_mem_region(0xDD0000, 256);
	243	free_irq(IRQ_AMIGA_PORTS, a3000_intr);
	244	return 1;
	245	}
	246
	247	MODULE_LICENSE("GPL");