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
|
#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))
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)
{
struct WD33C93_hostdata *hdata = shost_priv(a3000_host);
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->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
hdata->dma_bounce_buffer = kmalloc(hdata->dma_bounce_len,
GFP_KERNEL);
/* can't allocate memory; use PIO */
if (!hdata->dma_bounce_buffer) {
hdata->dma_bounce_len = 0;
return 1;
}
if (!dir_in) {
/* copy to bounce buffer for a write */
memcpy(hdata->dma_bounce_buffer, cmd->SCp.ptr,
cmd->SCp.this_residual);
}
addr = virt_to_bus(hdata->dma_bounce_buffer);
}
/* setup dma direction */
if (!dir_in)
cntr |= CNTR_DDIR;
/* remember direction */
hdata->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)
{
struct WD33C93_hostdata *hdata = shost_priv(instance);
/* disable SCSI interrupts */
unsigned short cntr = CNTR_PDMD;
if (!hdata->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->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->dma_bounce_buffer) {
if (SCpnt) {
if (hdata->dma_dir && SCpnt)
memcpy(SCpnt->SCp.ptr,
hdata->dma_bounce_buffer,
SCpnt->SCp.this_residual);
kfree(hdata->dma_bounce_buffer);
hdata->dma_bounce_buffer = NULL;
hdata->dma_bounce_len = 0;
} else {
kfree(hdata->dma_bounce_buffer);
hdata->dma_bounce_buffer = NULL;
hdata->dma_bounce_len = 0;
}
}
}
static int __init a3000_detect(struct scsi_host_template *tpnt)
{
wd33c93_regs regs;
struct WD33C93_hostdata *hdata;
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 = shost_priv(a3000_host);
hdata->no_sync = 0xff;
hdata->fast = 0;
hdata->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:
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)
{
DMA(instance)->CNTR = 0;
release_mem_region(0xDD0000, 256);
free_irq(IRQ_AMIGA_PORTS, a3000_intr);
return 1;
}
MODULE_LICENSE("GPL");
|
