[linux-2.6-block.git] / drivers / scsi / a2091.c

#include <linux/types.h>
#include <linux/mm.h>
#include <linux/blkdev.h>
#include <linux/sched.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 irqreturn_t a2091_intr (int irq, void *_instance, struct pt_regs *fp)
{
    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 (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 ||
	(!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
    {
	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 */
	    if (cmd->use_sg)
#if 0
		panic ("scsi%ddma: incomplete s/g support",
		       instance->host_no);
#else
		memcpy (HDATA(instance)->dma_bounce_buffer,
			cmd->SCp.ptr, cmd->SCp.this_residual);
#endif
	    else
		memcpy (HDATA(instance)->dma_bounce_buffer,
			cmd->request_buffer, cmd->request_bufflen);
	}
    }

    /* 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, 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 (SCpnt && SCpnt->use_sg) {
#if 0
	    panic ("scsi%d: incomplete s/g support",
		   instance->host_no);
#else
	    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;
	    
#endif
	} 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 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) {
	    release_mem_region(address, 256);
	    continue;
	}
	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);
	wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
	request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED, "A2091 SCSI",
		    instance);
	DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
	num_a2091++;
    }

    return num_a2091;
}

static int a2091_bus_reset(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"

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);
	wd33c93_release();
#endif
	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>
	4	#include <linux/sched.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
	22	#include<linux/stat.h>
	23
	24	#define DMA(ptr) ((a2091_scsiregs *)((ptr)->base))
	25	#define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
	26
	27	static irqreturn_t a2091_intr (int irq, void _instance, struct pt_regs fp)
	28	{
	29	unsigned long flags;
	30	unsigned int status;
	31	struct Scsi_Host instance = (struct Scsi_Host )_instance;
	32
	33	status = DMA(instance)->ISTR;
	34	if (!(status & (ISTR_INT_F\|ISTR_INT_P)) \|\| !(status & ISTR_INTS))
	35	return IRQ_NONE;
	36
	37	spin_lock_irqsave(instance->host_lock, flags);
	38	wd33c93_intr(instance);
	39	spin_unlock_irqrestore(instance->host_lock, flags);
	40	return IRQ_HANDLED;
	41	}
	42
	43	static int dma_setup (Scsi_Cmnd *cmd, int dir_in)
	44	{
	45	unsigned short cntr = CNTR_PDMD \| CNTR_INTEN;
	46	unsigned long addr = virt_to_bus(cmd->SCp.ptr);
	47	struct Scsi_Host *instance = cmd->device->host;
	48
	49	/* don't allow DMA if the physical address is bad */
	50	if (addr & A2091_XFER_MASK \|\|
	51	(!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
	52	{
	53	HDATA(instance)->dma_bounce_len = (cmd->SCp.this_residual + 511)
	54	& ~0x1ff;
	55	HDATA(instance)->dma_bounce_buffer =
	56	kmalloc (HDATA(instance)->dma_bounce_len, GFP_KERNEL);
	57
	58	/* can't allocate memory; use PIO */
	59	if (!HDATA(instance)->dma_bounce_buffer) {
	60	HDATA(instance)->dma_bounce_len = 0;
	61	return 1;
	62	}
	63
	64	/* get the physical address of the bounce buffer */
	65	addr = virt_to_bus(HDATA(instance)->dma_bounce_buffer);
	66
	67	/* the bounce buffer may not be in the first 16M of physmem */
	68	if (addr & A2091_XFER_MASK) {
69	/* we could use chipmem... maybe later */
70	kfree (HDATA(instance)->dma_bounce_buffer);
71	HDATA(instance)->dma_bounce_buffer = NULL;
72	HDATA(instance)->dma_bounce_len = 0;
73	return 1;
74	}
75
76	if (!dir_in) {
77	/* copy to bounce buffer for a write */
78	if (cmd->use_sg)
79	#if 0
80	panic ("scsi%ddma: incomplete s/g support",
81	instance->host_no);
82	#else
83	memcpy (HDATA(instance)->dma_bounce_buffer,
84	cmd->SCp.ptr, cmd->SCp.this_residual);
85	#endif
86	else
87	memcpy (HDATA(instance)->dma_bounce_buffer,
88	cmd->request_buffer, cmd->request_bufflen);
89	}
90	}
91
92	/* setup dma direction */
93	if (!dir_in)
94	cntr \|= CNTR_DDIR;
95
96	/* remember direction */
97	HDATA(cmd->device->host)->dma_dir = dir_in;
98
99	DMA(cmd->device->host)->CNTR = cntr;
100
101	/* setup DMA physical address */
102	DMA(cmd->device->host)->ACR = addr;
103
104	if (dir_in){
105	/* invalidate any cache */
106	cache_clear (addr, cmd->SCp.this_residual);
107	}else{
108	/* push any dirty cache */
109	cache_push (addr, cmd->SCp.this_residual);
110	}
111	/* start DMA */
112	DMA(cmd->device->host)->ST_DMA = 1;
113
114	/* return success */
115	return 0;
116	}
117
118	static void dma_stop (struct Scsi_Host instance, Scsi_Cmnd SCpnt,
119	int status)
120	{
121	/* disable SCSI interrupts */
122	unsigned short cntr = CNTR_PDMD;
123
124	if (!HDATA(instance)->dma_dir)
125	cntr \|= CNTR_DDIR;
126
127	/* disable SCSI interrupts */
128	DMA(instance)->CNTR = cntr;
129
130	/* flush if we were reading */
131	if (HDATA(instance)->dma_dir) {
132	DMA(instance)->FLUSH = 1;
133	while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
134	;
135	}
136
137	/* clear a possible interrupt */
138	DMA(instance)->CINT = 1;
139
140	/* stop DMA */
141	DMA(instance)->SP_DMA = 1;
142
143	/* restore the CONTROL bits (minus the direction flag) */
144	DMA(instance)->CNTR = CNTR_PDMD \| CNTR_INTEN;
145
146	/* copy from a bounce buffer, if necessary */
147	if (status && HDATA(instance)->dma_bounce_buffer) {
148	if (SCpnt && SCpnt->use_sg) {
149	#if 0
150	panic ("scsi%d: incomplete s/g support",
151	instance->host_no);
152	#else
153	if( HDATA(instance)->dma_dir )
154	memcpy (SCpnt->SCp.ptr,
155	HDATA(instance)->dma_bounce_buffer,
156	SCpnt->SCp.this_residual);
157	kfree (HDATA(instance)->dma_bounce_buffer);
158	HDATA(instance)->dma_bounce_buffer = NULL;
159	HDATA(instance)->dma_bounce_len = 0;
160
161	#endif
162	} else {
163	if (HDATA(instance)->dma_dir && SCpnt)
164	memcpy (SCpnt->request_buffer,
165	HDATA(instance)->dma_bounce_buffer,
166	SCpnt->request_bufflen);
167
168	kfree (HDATA(instance)->dma_bounce_buffer);
169	HDATA(instance)->dma_bounce_buffer = NULL;
170	HDATA(instance)->dma_bounce_len = 0;
171	}
172	}
173	}
174
d0be4a7d	175	int __init a2091_detect(struct scsi_host_template *tpnt)
1da177e4 LT	176	{
	177	static unsigned char called = 0;
	178	struct Scsi_Host *instance;
	179	unsigned long address;
	180	struct zorro_dev *z = NULL;
	181	wd33c93_regs regs;
	182	int num_a2091 = 0;
	183
	184	if (!MACH_IS_AMIGA \|\| called)
	185	return 0;
	186	called = 1;
	187
	188	tpnt->proc_name = "A2091";
	189	tpnt->proc_info = &wd33c93_proc_info;
	190
	191	while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
	192	if (z->id != ZORRO_PROD_CBM_A590_A2091_1 &&
	193	z->id != ZORRO_PROD_CBM_A590_A2091_2)
	194	continue;
	195	address = z->resource.start;
	196	if (!request_mem_region(address, 256, "wd33c93"))
	197	continue;
	198
	199	instance = scsi_register (tpnt, sizeof (struct WD33C93_hostdata));
	200	if (instance == NULL) {
	201	release_mem_region(address, 256);
	202	continue;
	203	}
	204	instance->base = ZTWO_VADDR(address);
	205	instance->irq = IRQ_AMIGA_PORTS;
	206	instance->unique_id = z->slotaddr;
	207	DMA(instance)->DAWR = DAWR_A2091;
	208	regs.SASR = &(DMA(instance)->SASR);
	209	regs.SCMD = &(DMA(instance)->SCMD);
	210	wd33c93_init(instance, regs, dma_setup, dma_stop, WD33C93_FS_8_10);
1d6f359a	211	request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED, "A2091 SCSI",
1da177e4 LT	212	instance);
	213	DMA(instance)->CNTR = CNTR_PDMD \| CNTR_INTEN;
	214	num_a2091++;
	215	}
	216
	217	return num_a2091;
	218	}
	219
	220	static int a2091_bus_reset(Scsi_Cmnd *cmd)
	221	{
	222	/* FIXME perform bus-specific reset */
68b3aa7c	223
df0ae249 JG	224	/* FIXME 2: kill this function, and let midlayer fall back
	225	to the same action, calling wd33c93_host_reset() */
	226
68b3aa7c	227	spin_lock_irq(cmd->device->host->host_lock);
1da177e4	228	wd33c93_host_reset(cmd);
68b3aa7c JG	229	spin_unlock_irq(cmd->device->host->host_lock);
68b3aa7c JG	230
1da177e4 LT	231	return SUCCESS;
	232	}
	233
	234	#define HOSTS_C
	235
d0be4a7d	236	static struct scsi_host_template driver_template = {
1da177e4 LT	237	.proc_name = "A2901",
	238	.name = "Commodore A2091/A590 SCSI",
	239	.detect = a2091_detect,
	240	.release = a2091_release,
	241	.queuecommand = wd33c93_queuecommand,
	242	.eh_abort_handler = wd33c93_abort,
	243	.eh_bus_reset_handler = a2091_bus_reset,
	244	.eh_host_reset_handler = wd33c93_host_reset,
	245	.can_queue = CAN_QUEUE,
	246	.this_id = 7,
	247	.sg_tablesize = SG_ALL,
	248	.cmd_per_lun = CMD_PER_LUN,
	249	.use_clustering = DISABLE_CLUSTERING
	250	};
	251
	252
	253	#include "scsi_module.c"
	254
	255	int a2091_release(struct Scsi_Host *instance)
	256	{
	257	#ifdef MODULE
	258	DMA(instance)->CNTR = 0;
	259	release_mem_region(ZTWO_PADDR(instance->base), 256);
	260	free_irq(IRQ_AMIGA_PORTS, instance);
	261	wd33c93_release();
	262	#endif
	263	return 1;
	264	}
	265
	266	MODULE_LICENSE("GPL");