summaryrefslogtreecommitdiff
path: root/drivers/scsi/a2091.c
blob: ce3c37610c5c26b7b582cc5402ce178e32432250 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/blkdev.h>
#include <linux/sched.h>
#include <linux/version.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(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, SA_SHIRQ, "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 */

	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 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");