[deliverable/linux.git] / drivers / scsi / a2091.c

#include <linux/types.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/init.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 <linux/zorro.h>
#include <asm/irq.h>
#include <linux/spinlock.h>

#include "scsi.h"
#include <scsi/scsi_host.h>
#include "wd33c93.h"
#include "a2091.h"

#include <linux/stat.h>


#define DMA(ptr)	((a2091_scsiregs *)((ptr)->base))
#define HDATA(ptr)	((struct WD33C93_hostdata *)((ptr)->hostdata))

static int a2091_release(struct Scsi_Host *instance);

static irqreturn_t a2091_intr(int irq, void *_instance)
{
	unsigned long flags;
	unsigned int status;
	struct Scsi_Host *instance = (struct Scsi_Host *)_instance;

	status = DMA(instance)->ISTR;
	if (!(status & (ISTR_INT_F | ISTR_INT_P)) || !(status & ISTR_INTS))
		return IRQ_NONE;

	spin_lock_irqsave(instance->host_lock, flags);
	wd33c93_intr(instance);
	spin_unlock_irqrestore(instance->host_lock, flags);
	return IRQ_HANDLED;
}

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);
	struct Scsi_Host *instance = cmd->device->host;

	/* don't allow DMA if the physical address is bad */
	if (addr & A2091_XFER_MASK) {
		HDATA(instance)->dma_bounce_len =
			(cmd->SCp.this_residual + 511) & ~0x1ff;
		HDATA(instance)->dma_bounce_buffer =
			kmalloc(HDATA(instance)->dma_bounce_len, GFP_KERNEL);

		/* can't allocate memory; use PIO */
		if (!HDATA(instance)->dma_bounce_buffer) {
			HDATA(instance)->dma_bounce_len = 0;
			return 1;
		}

		/* get the physical address of the bounce buffer */
		addr = virt_to_bus(HDATA(instance)->dma_bounce_buffer);

		/* the bounce buffer may not be in the first 16M of physmem */
		if (addr & A2091_XFER_MASK) {
			/* we could use chipmem... maybe later */
			kfree(HDATA(instance)->dma_bounce_buffer);
			HDATA(instance)->dma_bounce_buffer = NULL;
			HDATA(instance)->dma_bounce_len = 0;
			return 1;
		}

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

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

	/* remember direction */
	HDATA(cmd->device->host)->dma_dir = dir_in;

	DMA(cmd->device->host)->CNTR = cntr;

	/* setup DMA *physical* address */
	DMA(cmd->device->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 */
	DMA(cmd->device->host)->ST_DMA = 1;

	/* 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;

	/* disable SCSI interrupts */
	DMA(instance)->CNTR = cntr;

	/* flush if we were reading */
	if (HDATA(instance)->dma_dir) {
		DMA(instance)->FLUSH = 1;
		while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
			;
	}

	/* clear a possible interrupt */
	DMA(instance)->CINT = 1;

	/* stop DMA */
	DMA(instance)->SP_DMA = 1;

	/* restore the CONTROL bits (minus the direction flag) */
	DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;

	/* copy from a bounce buffer, if necessary */
	if (status && HDATA(instance)->dma_bounce_buffer) {
		if (HDATA(instance)->dma_dir)
			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;
	}
}

static int __init a2091_detect(struct scsi_host_template *tpnt)
{
	static unsigned char called = 0;
	struct Scsi_Host *instance;
	unsigned long address;
	struct zorro_dev *z = NULL;
	wd33c93_regs regs;
	int num_a2091 = 0;

	if (!MACH_IS_AMIGA || called)
		return 0;
	called = 1;

	tpnt->proc_name = "A2091";
	tpnt->proc_info = &wd33c93_proc_info;

	while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
		if (z->id != ZORRO_PROD_CBM_A590_A2091_1 &&
		    z->id != ZORRO_PROD_CBM_A590_A2091_2)
			continue;
		address = z->resource.start;
		if (!request_mem_region(address, 256, "wd33c93"))
			continue;

		instance = scsi_register(tpnt, sizeof(struct WD33C93_hostdata));
		if (instance == NULL)
			goto release;
		instance->base = ZTWO_VADDR(address);
		instance->irq = IRQ_AMIGA_PORTS;
		instance->unique_id = z->slotaddr;
		DMA(instance)->DAWR = DAWR_A2091;
		regs.SASR = &(DMA(instance)->SASR);
		regs.SCMD = &(DMA(instance)->SCMD);
		HDATA(instance)->no_sync = 0xff;
		HDATA(instance)->fast = 0;
		HDATA(instance)->dma_mode = CTRL_DMA;
		wd33c93_init(instance, regs, dma_setup, dma_stop,
			     WD33C93_FS_8_10);
		if (request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED,
				"A2091 SCSI", instance))
			goto unregister;
		DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
		num_a2091++;
		continue;

unregister:
		scsi_unregister(instance);
release:
		release_mem_region(address, 256);
	}

	return num_a2091;
}

static int a2091_bus_reset(struct scsi_cmnd *cmd)
{
	/* FIXME perform bus-specific reset */

	/* FIXME 2: kill this function, and let midlayer fall back
	   to the same action, calling wd33c93_host_reset() */

	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		= "A2901",
	.name			= "Commodore A2091/A590 SCSI",
	.detect			= a2091_detect,
	.release		= a2091_release,
	.queuecommand		= wd33c93_queuecommand,
	.eh_abort_handler	= wd33c93_abort,
	.eh_bus_reset_handler	= a2091_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		= DISABLE_CLUSTERING
};


#include "scsi_module.c"

static int a2091_release(struct Scsi_Host *instance)
{
#ifdef MODULE
	DMA(instance)->CNTR = 0;
	release_mem_region(ZTWO_PADDR(instance->base), 256);
	free_irq(IRQ_AMIGA_PORTS, instance);
#endif
	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/init.h>
	6	#include <linux/interrupt.h>
	7
	8	#include <asm/setup.h>
	9	#include <asm/page.h>
	10	#include <asm/pgtable.h>
	11	#include <asm/amigaints.h>
	12	#include <asm/amigahw.h>
	13	#include <linux/zorro.h>
	14	#include <asm/irq.h>
	15	#include <linux/spinlock.h>
	16
	17	#include "scsi.h"
	18	#include <scsi/scsi_host.h>
	19	#include "wd33c93.h"
	20	#include "a2091.h"
	21
09bc85b0	22	#include <linux/stat.h>
1da177e4	23
09bc85b0 GU	24
	25	#define DMA(ptr) ((a2091_scsiregs *)((ptr)->base))
	26	#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
1da177e4	27
5880f486 AB	28	static int a2091_release(struct Scsi_Host *instance);
5880f486 AB	29
09bc85b0	30	static irqreturn_t a2091_intr(int irq, void *_instance)
1da177e4	31	{
09bc85b0 GU	32	unsigned long flags;
	33	unsigned int status;
	34	struct Scsi_Host instance = (struct Scsi_Host )_instance;
	35
	36	status = DMA(instance)->ISTR;
	37	if (!(status & (ISTR_INT_F \| ISTR_INT_P)) \|\| !(status & ISTR_INTS))
	38	return IRQ_NONE;
	39
	40	spin_lock_irqsave(instance->host_lock, flags);
	41	wd33c93_intr(instance);
	42	spin_unlock_irqrestore(instance->host_lock, flags);
	43	return IRQ_HANDLED;
1da177e4 LT	44	}
1da177e4 LT	45
65396410	46	static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
1da177e4	47	{
09bc85b0 GU	48	unsigned short cntr = CNTR_PDMD \| CNTR_INTEN;
	49	unsigned long addr = virt_to_bus(cmd->SCp.ptr);
	50	struct Scsi_Host *instance = cmd->device->host;
1da177e4	51
09bc85b0	52	/* don't allow DMA if the physical address is bad */
1da177e4	53	if (addr & A2091_XFER_MASK) {
09bc85b0 GU	54	HDATA(instance)->dma_bounce_len =
	55	(cmd->SCp.this_residual + 511) & ~0x1ff;
	56	HDATA(instance)->dma_bounce_buffer =
	57	kmalloc(HDATA(instance)->dma_bounce_len, GFP_KERNEL);
	58
	59	/* can't allocate memory; use PIO */
	60	if (!HDATA(instance)->dma_bounce_buffer) {
	61	HDATA(instance)->dma_bounce_len = 0;
	62	return 1;
	63	}
	64
	65	/* get the physical address of the bounce buffer */
	66	addr = virt_to_bus(HDATA(instance)->dma_bounce_buffer);
	67
	68	/* the bounce buffer may not be in the first 16M of physmem */
	69	if (addr & A2091_XFER_MASK) {
	70	/* we could use chipmem... maybe later */
	71	kfree(HDATA(instance)->dma_bounce_buffer);
	72	HDATA(instance)->dma_bounce_buffer = NULL;
	73	HDATA(instance)->dma_bounce_len = 0;
	74	return 1;
	75	}
	76
	77	if (!dir_in) {
	78	/* copy to bounce buffer for a write */
	79	memcpy(HDATA(instance)->dma_bounce_buffer,
	80	cmd->SCp.ptr, cmd->SCp.this_residual);
	81	}
1da177e4	82	}
1da177e4	83
09bc85b0 GU	84	/* setup dma direction */
	85	if (!dir_in)
	86	cntr \|= CNTR_DDIR;
1da177e4	87
09bc85b0 GU	88	/* remember direction */
09bc85b0 GU	89	HDATA(cmd->device->host)->dma_dir = dir_in;
1da177e4	90
09bc85b0	91	DMA(cmd->device->host)->CNTR = cntr;
1da177e4	92
09bc85b0 GU	93	/* setup DMA physical address */
09bc85b0 GU	94	DMA(cmd->device->host)->ACR = addr;
1da177e4	95
09bc85b0 GU	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	DMA(cmd->device->host)->ST_DMA = 1;
1da177e4	105
09bc85b0 GU	106	/* return success */
09bc85b0 GU	107	return 0;
1da177e4 LT	108	}
1da177e4 LT	109
65396410	110	static void dma_stop(struct Scsi_Host instance, struct scsi_cmnd SCpnt,
09bc85b0	111	int status)
1da177e4	112	{
09bc85b0 GU	113	/* disable SCSI interrupts */
	114	unsigned short cntr = CNTR_PDMD;
	115
	116	if (!HDATA(instance)->dma_dir)
	117	cntr \|= CNTR_DDIR;
	118
	119	/* disable SCSI interrupts */
	120	DMA(instance)->CNTR = cntr;
	121
	122	/* flush if we were reading */
	123	if (HDATA(instance)->dma_dir) {
	124	DMA(instance)->FLUSH = 1;
	125	while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
	126	;
	127	}
	128
	129	/* clear a possible interrupt */
	130	DMA(instance)->CINT = 1;
	131
	132	/* stop DMA */
	133	DMA(instance)->SP_DMA = 1;
	134
	135	/* restore the CONTROL bits (minus the direction flag) */
	136	DMA(instance)->CNTR = CNTR_PDMD \| CNTR_INTEN;
	137
	138	/* copy from a bounce buffer, if necessary */
	139	if (status && HDATA(instance)->dma_bounce_buffer) {
	140	if (HDATA(instance)->dma_dir)
	141	memcpy(SCpnt->SCp.ptr,
	142	HDATA(instance)->dma_bounce_buffer,
	143	SCpnt->SCp.this_residual);
	144	kfree(HDATA(instance)->dma_bounce_buffer);
	145	HDATA(instance)->dma_bounce_buffer = NULL;
	146	HDATA(instance)->dma_bounce_len = 0;
	147	}
1da177e4 LT	148	}
1da177e4 LT	149
5880f486	150	static int __init a2091_detect(struct scsi_host_template *tpnt)
1da177e4	151	{
09bc85b0 GU	152	static unsigned char called = 0;
	153	struct Scsi_Host *instance;
	154	unsigned long address;
	155	struct zorro_dev *z = NULL;
	156	wd33c93_regs regs;
	157	int num_a2091 = 0;
	158
	159	if (!MACH_IS_AMIGA \|\| called)
	160	return 0;
	161	called = 1;
	162
	163	tpnt->proc_name = "A2091";
	164	tpnt->proc_info = &wd33c93_proc_info;
	165
	166	while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
	167	if (z->id != ZORRO_PROD_CBM_A590_A2091_1 &&
	168	z->id != ZORRO_PROD_CBM_A590_A2091_2)
	169	continue;
	170	address = z->resource.start;
	171	if (!request_mem_region(address, 256, "wd33c93"))
	172	continue;
	173
	174	instance = scsi_register(tpnt, sizeof(struct WD33C93_hostdata));
	175	if (instance == NULL)
	176	goto release;
	177	instance->base = ZTWO_VADDR(address);
	178	instance->irq = IRQ_AMIGA_PORTS;
	179	instance->unique_id = z->slotaddr;
	180	DMA(instance)->DAWR = DAWR_A2091;
	181	regs.SASR = &(DMA(instance)->SASR);
	182	regs.SCMD = &(DMA(instance)->SCMD);
	183	HDATA(instance)->no_sync = 0xff;
	184	HDATA(instance)->fast = 0;
	185	HDATA(instance)->dma_mode = CTRL_DMA;
	186	wd33c93_init(instance, regs, dma_setup, dma_stop,
	187	WD33C93_FS_8_10);
	188	if (request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED,
	189	"A2091 SCSI", instance))
	190	goto unregister;
	191	DMA(instance)->CNTR = CNTR_PDMD \| CNTR_INTEN;
	192	num_a2091++;
	193	continue;
d38f47a9 GU	194
d38f47a9 GU	195	unregister:
09bc85b0	196	scsi_unregister(instance);
d38f47a9	197	release:
09bc85b0 GU	198	release_mem_region(address, 256);
09bc85b0 GU	199	}
1da177e4	200
09bc85b0	201	return num_a2091;
1da177e4 LT	202	}
1da177e4 LT	203
65396410	204	static int a2091_bus_reset(struct scsi_cmnd *cmd)
1da177e4 LT	205	{
1da177e4 LT	206	/* FIXME perform bus-specific reset */
68b3aa7c	207
df0ae249 JG	208	/* FIXME 2: kill this function, and let midlayer fall back
	209	to the same action, calling wd33c93_host_reset() */
	210
68b3aa7c	211	spin_lock_irq(cmd->device->host->host_lock);
1da177e4	212	wd33c93_host_reset(cmd);
68b3aa7c JG	213	spin_unlock_irq(cmd->device->host->host_lock);
68b3aa7c JG	214
1da177e4 LT	215	return SUCCESS;
	216	}
	217
	218	#define HOSTS_C
	219
d0be4a7d	220	static struct scsi_host_template driver_template = {
1da177e4 LT	221	.proc_name = "A2901",
	222	.name = "Commodore A2091/A590 SCSI",
	223	.detect = a2091_detect,
	224	.release = a2091_release,
	225	.queuecommand = wd33c93_queuecommand,
	226	.eh_abort_handler = wd33c93_abort,
	227	.eh_bus_reset_handler = a2091_bus_reset,
	228	.eh_host_reset_handler = wd33c93_host_reset,
	229	.can_queue = CAN_QUEUE,
	230	.this_id = 7,
	231	.sg_tablesize = SG_ALL,
	232	.cmd_per_lun = CMD_PER_LUN,
	233	.use_clustering = DISABLE_CLUSTERING
	234	};
	235
	236
	237	#include "scsi_module.c"
	238
5880f486	239	static int a2091_release(struct Scsi_Host *instance)
1da177e4 LT	240	{
	241	#ifdef MODULE
	242	DMA(instance)->CNTR = 0;
	243	release_mem_region(ZTWO_PADDR(instance->base), 256);
	244	free_irq(IRQ_AMIGA_PORTS, instance);
1da177e4 LT	245	#endif
	246	return 1;
	247	}
	248
	249	MODULE_LICENSE("GPL");