[linux.git] / drivers / scsi / a3000.c

#include <linux/types.h>
#include <linux/mm.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 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 ||
	(!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
    {
	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 */
	    if (cmd->use_sg) {
		memcpy (HDATA(a3000_host)->dma_bounce_buffer,
			cmd->SCp.ptr, cmd->SCp.this_residual);
	    } else
		memcpy (HDATA(a3000_host)->dma_bounce_buffer,
			cmd->request_buffer, cmd->request_bufflen);
	}

	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 && SCpnt->use_sg) {
	    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 {
	    if (HDATA(instance)->dma_dir && SCpnt)
		memcpy (SCpnt->request_buffer,
			HDATA(instance)->dma_bounce_buffer,
			SCpnt->request_bufflen);

	    kfree (HDATA(instance)->dma_bounce_buffer);
	    HDATA(instance)->dma_bounce_buffer = NULL;
	    HDATA(instance)->dma_bounce_len = 0;
	}
    }
}

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);
    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"

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>
	2	#include <linux/mm.h>
	3	#include <linux/blkdev.h>
1da177e4 LT	4	#include <linux/ioport.h>
	5	#include <linux/init.h>
	6	#include <linux/spinlock.h>
	7	#include <linux/interrupt.h>
	8
	9	#include <asm/setup.h>
	10	#include <asm/page.h>
	11	#include <asm/pgtable.h>
	12	#include <asm/amigaints.h>
	13	#include <asm/amigahw.h>
	14	#include <asm/irq.h>
	15
	16	#include "scsi.h"
	17	#include <scsi/scsi_host.h>
	18	#include "wd33c93.h"
	19	#include "a3000.h"
	20
	21	#include<linux/stat.h>
	22
	23	#define DMA(ptr) ((a3000_scsiregs *)((ptr)->base))
	24	#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
	25
	26	static struct Scsi_Host *a3000_host = NULL;
	27
7d12e780	28	static irqreturn_t a3000_intr (int irq, void *dummy)
1da177e4 LT	29	{
	30	unsigned long flags;
	31	unsigned int status = DMA(a3000_host)->ISTR;
	32
	33	if (!(status & ISTR_INT_P))
	34	return IRQ_NONE;
	35	if (status & ISTR_INTS)
	36	{
	37	spin_lock_irqsave(a3000_host->host_lock, flags);
	38	wd33c93_intr (a3000_host);
	39	spin_unlock_irqrestore(a3000_host->host_lock, flags);
	40	return IRQ_HANDLED;
	41	}
	42	printk("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
	43	return IRQ_NONE;
	44	}
	45
65396410	46	static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
1da177e4 LT	47	{
	48	unsigned short cntr = CNTR_PDMD \| CNTR_INTEN;
	49	unsigned long addr = virt_to_bus(cmd->SCp.ptr);
	50
	51	/*
	52	* if the physical address has the wrong alignment, or if
	53	* physical address is bad, or if it is a write and at the
	54	* end of a physical memory chunk, then allocate a bounce
	55	* buffer
	56	*/
	57	if (addr & A3000_XFER_MASK \|\|
	58	(!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
	59	{
	60	HDATA(a3000_host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
	61	& ~0x1ff;
	62	HDATA(a3000_host)->dma_bounce_buffer =
	63	kmalloc (HDATA(a3000_host)->dma_bounce_len, GFP_KERNEL);
	64
	65	/* can't allocate memory; use PIO */
	66	if (!HDATA(a3000_host)->dma_bounce_buffer) {
	67	HDATA(a3000_host)->dma_bounce_len = 0;
	68	return 1;
	69	}
	70
	71	if (!dir_in) {
	72	/* copy to bounce buffer for a write */
	73	if (cmd->use_sg) {
	74	memcpy (HDATA(a3000_host)->dma_bounce_buffer,
	75	cmd->SCp.ptr, cmd->SCp.this_residual);
	76	} else
	77	memcpy (HDATA(a3000_host)->dma_bounce_buffer,
	78	cmd->request_buffer, cmd->request_bufflen);
	79	}
	80
	81	addr = virt_to_bus(HDATA(a3000_host)->dma_bounce_buffer);
	82	}
	83
	84	/* setup dma direction */
	85	if (!dir_in)
	86	cntr \|= CNTR_DDIR;
	87
	88	/* remember direction */
	89	HDATA(a3000_host)->dma_dir = dir_in;
	90
	91	DMA(a3000_host)->CNTR = cntr;
	92
	93	/* setup DMA physical address */
	94	DMA(a3000_host)->ACR = addr;
	95
	96	if (dir_in)
	97	/* invalidate any cache */
	98	cache_clear (addr, cmd->SCp.this_residual);
	99	else
	100	/* push any dirty cache */
	101	cache_push (addr, cmd->SCp.this_residual);
	102
	103	/* start DMA */
	104	mb(); /* make sure setup is completed */
	105	DMA(a3000_host)->ST_DMA = 1;
	106	mb(); /* make sure DMA has started before next IO */
	107
	108	/* return success */
	109	return 0;
	110	}
111
65396410 HK	112	static void dma_stop(struct Scsi_Host instance, struct scsi_cmnd SCpnt,
65396410 HK	113	int status)
1da177e4 LT	114	{
	115	/* disable SCSI interrupts */
	116	unsigned short cntr = CNTR_PDMD;
	117
	118	if (!HDATA(instance)->dma_dir)
	119	cntr \|= CNTR_DDIR;
	120
	121	DMA(instance)->CNTR = cntr;
	122	mb(); /* make sure CNTR is updated before next IO */
	123
	124	/* flush if we were reading */
	125	if (HDATA(instance)->dma_dir) {
	126	DMA(instance)->FLUSH = 1;
	127	mb(); /* don't allow prefetch */
	128	while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
	129	barrier();
	130	mb(); /* no IO until FLUSH is done */
	131	}
	132
	133	/* clear a possible interrupt */
	134	/* I think that this CINT is only necessary if you are
	135	* using the terminal count features. HM 7 Mar 1994
	136	*/
	137	DMA(instance)->CINT = 1;
	138
	139	/* stop DMA */
	140	DMA(instance)->SP_DMA = 1;
	141	mb(); /* make sure DMA is stopped before next IO */
	142
	143	/* restore the CONTROL bits (minus the direction flag) */
	144	DMA(instance)->CNTR = CNTR_PDMD \| CNTR_INTEN;
	145	mb(); /* make sure CNTR is updated before next IO */
	146
	147	/* copy from a bounce buffer, if necessary */
	148	if (status && HDATA(instance)->dma_bounce_buffer) {
	149	if (SCpnt && SCpnt->use_sg) {
	150	if (HDATA(instance)->dma_dir && SCpnt)
	151	memcpy (SCpnt->SCp.ptr,
	152	HDATA(instance)->dma_bounce_buffer,
	153	SCpnt->SCp.this_residual);
	154	kfree (HDATA(instance)->dma_bounce_buffer);
	155	HDATA(instance)->dma_bounce_buffer = NULL;
	156	HDATA(instance)->dma_bounce_len = 0;
	157	} else {
	158	if (HDATA(instance)->dma_dir && SCpnt)
	159	memcpy (SCpnt->request_buffer,
	160	HDATA(instance)->dma_bounce_buffer,
	161	SCpnt->request_bufflen);
	162
	163	kfree (HDATA(instance)->dma_bounce_buffer);
	164	HDATA(instance)->dma_bounce_buffer = NULL;
	165	HDATA(instance)->dma_bounce_len = 0;
	166	}
	167	}
	168	}
	169
d0be4a7d	170	int __init a3000_detect(struct scsi_host_template *tpnt)
1da177e4 LT	171	{
	172	wd33c93_regs regs;
	173
	174	if (!MACH_IS_AMIGA \|\| !AMIGAHW_PRESENT(A3000_SCSI))
	175	return 0;
	176	if (!request_mem_region(0xDD0000, 256, "wd33c93"))
	177	return 0;
	178
	179	tpnt->proc_name = "A3000";
	180	tpnt->proc_info = &wd33c93_proc_info;
	181
	182	a3000_host = scsi_register (tpnt, sizeof(struct WD33C93_hostdata));
	183	if (a3000_host == NULL)
	184	goto fail_register;
	185
	186	a3000_host->base = ZTWO_VADDR(0xDD0000);
	187	a3000_host->irq = IRQ_AMIGA_PORTS;
	188	DMA(a3000_host)->DAWR = DAWR_A3000;
	189	regs.SASR = &(DMA(a3000_host)->SASR);
	190	regs.SCMD = &(DMA(a3000_host)->SCMD);
	191	wd33c93_init(a3000_host, regs, dma_setup, dma_stop, WD33C93_FS_12_15);
1d6f359a	192	if (request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED, "A3000 SCSI",
1da177e4 LT	193	a3000_intr))
	194	goto fail_irq;
	195	DMA(a3000_host)->CNTR = CNTR_PDMD \| CNTR_INTEN;
	196
	197	return 1;
	198
	199	fail_irq:
	200	wd33c93_release();
	201	scsi_unregister(a3000_host);
	202	fail_register:
	203	release_mem_region(0xDD0000, 256);
	204	return 0;
	205	}
	206
65396410	207	static int a3000_bus_reset(struct scsi_cmnd *cmd)
1da177e4 LT	208	{
1da177e4 LT	209	/* FIXME perform bus-specific reset */
df0ae249 JG	210
	211	/* FIXME 2: kill this entire function, which should
	212	cause mid-layer to call wd33c93_host_reset anyway? */
68b3aa7c JG	213
68b3aa7c JG	214	spin_lock_irq(cmd->device->host->host_lock);
1da177e4	215	wd33c93_host_reset(cmd);
68b3aa7c JG	216	spin_unlock_irq(cmd->device->host->host_lock);
68b3aa7c JG	217
1da177e4 LT	218	return SUCCESS;
	219	}
	220
	221	#define HOSTS_C
	222
d0be4a7d	223	static struct scsi_host_template driver_template = {
1da177e4 LT	224	.proc_name = "A3000",
	225	.name = "Amiga 3000 built-in SCSI",
	226	.detect = a3000_detect,
	227	.release = a3000_release,
	228	.queuecommand = wd33c93_queuecommand,
	229	.eh_abort_handler = wd33c93_abort,
	230	.eh_bus_reset_handler = a3000_bus_reset,
	231	.eh_host_reset_handler = wd33c93_host_reset,
	232	.can_queue = CAN_QUEUE,
	233	.this_id = 7,
	234	.sg_tablesize = SG_ALL,
	235	.cmd_per_lun = CMD_PER_LUN,
	236	.use_clustering = ENABLE_CLUSTERING
	237	};
	238
	239
	240	#include "scsi_module.c"
	241
	242	int a3000_release(struct Scsi_Host *instance)
	243	{
	244	wd33c93_release();
	245	DMA(instance)->CNTR = 0;
	246	release_mem_region(0xDD0000, 256);
	247	free_irq(IRQ_AMIGA_PORTS, a3000_intr);
	248	return 1;
	249	}
	250
	251	MODULE_LICENSE("GPL");