File: /usr/src/linux/drivers/scsi/a2091.c
1 #include <linux/types.h>
2 #include <linux/mm.h>
3 #include <linux/blk.h>
4 #include <linux/sched.h>
5 #include <linux/version.h>
6 #include <linux/init.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 "hosts.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 struct Scsi_Host *first_instance = NULL;
28 static Scsi_Host_Template *a2091_template;
29
30 static void a2091_intr (int irq, void *dummy, struct pt_regs *fp)
31 {
32 unsigned long flags;
33 unsigned int status;
34 struct Scsi_Host *instance;
35 for (instance = first_instance; instance &&
36 instance->hostt == a2091_template; instance = instance->next)
37 {
38 status = DMA(instance)->ISTR;
39 if (!(status & (ISTR_INT_F|ISTR_INT_P)))
40 continue;
41
42 if (status & ISTR_INTS) {
43 spin_lock_irqsave(&io_request_lock, flags);
44 wd33c93_intr (instance);
45 spin_unlock_irqrestore(&io_request_lock, flags);
46 }
47 }
48 }
49
50 static int dma_setup (Scsi_Cmnd *cmd, int dir_in)
51 {
52 unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
53 unsigned long addr = virt_to_bus(cmd->SCp.ptr);
54 struct Scsi_Host *instance = cmd->host;
55
56 /* don't allow DMA if the physical address is bad */
57 if (addr & A2091_XFER_MASK ||
58 (!dir_in && mm_end_of_chunk (addr, cmd->SCp.this_residual)))
59 {
60 HDATA(instance)->dma_bounce_len = (cmd->SCp.this_residual + 511)
61 & ~0x1ff;
62 HDATA(instance)->dma_bounce_buffer =
63 scsi_malloc (HDATA(instance)->dma_bounce_len);
64
65 /* can't allocate memory; use PIO */
66 if (!HDATA(instance)->dma_bounce_buffer) {
67 HDATA(instance)->dma_bounce_len = 0;
68 return 1;
69 }
70
71 /* get the physical address of the bounce buffer */
72 addr = virt_to_bus(HDATA(instance)->dma_bounce_buffer);
73
74 /* the bounce buffer may not be in the first 16M of physmem */
75 if (addr & A2091_XFER_MASK) {
76 /* we could use chipmem... maybe later */
77 scsi_free (HDATA(instance)->dma_bounce_buffer,
78 HDATA(instance)->dma_bounce_len);
79 HDATA(instance)->dma_bounce_buffer = NULL;
80 HDATA(instance)->dma_bounce_len = 0;
81 return 1;
82 }
83
84 if (!dir_in) {
85 /* copy to bounce buffer for a write */
86 if (cmd->use_sg)
87 #if 0
88 panic ("scsi%ddma: incomplete s/g support",
89 instance->host_no);
90 #else
91 memcpy (HDATA(instance)->dma_bounce_buffer,
92 cmd->SCp.ptr, cmd->SCp.this_residual);
93 #endif
94 else
95 memcpy (HDATA(instance)->dma_bounce_buffer,
96 cmd->request_buffer, cmd->request_bufflen);
97 }
98 }
99
100 /* setup dma direction */
101 if (!dir_in)
102 cntr |= CNTR_DDIR;
103
104 /* remember direction */
105 HDATA(cmd->host)->dma_dir = dir_in;
106
107 DMA(cmd->host)->CNTR = cntr;
108
109 /* setup DMA *physical* address */
110 DMA(cmd->host)->ACR = addr;
111
112 if (dir_in){
113 /* invalidate any cache */
114 cache_clear (addr, cmd->SCp.this_residual);
115 }else{
116 /* push any dirty cache */
117 cache_push (addr, cmd->SCp.this_residual);
118 }
119 /* start DMA */
120 DMA(cmd->host)->ST_DMA = 1;
121
122 /* return success */
123 return 0;
124 }
125
126 static void dma_stop (struct Scsi_Host *instance, Scsi_Cmnd *SCpnt,
127 int status)
128 {
129 /* disable SCSI interrupts */
130 unsigned short cntr = CNTR_PDMD;
131
132 if (!HDATA(instance)->dma_dir)
133 cntr |= CNTR_DDIR;
134
135 /* disable SCSI interrupts */
136 DMA(instance)->CNTR = cntr;
137
138 /* flush if we were reading */
139 if (HDATA(instance)->dma_dir) {
140 DMA(instance)->FLUSH = 1;
141 while (!(DMA(instance)->ISTR & ISTR_FE_FLG))
142 ;
143 }
144
145 /* clear a possible interrupt */
146 DMA(instance)->CINT = 1;
147
148 /* stop DMA */
149 DMA(instance)->SP_DMA = 1;
150
151 /* restore the CONTROL bits (minus the direction flag) */
152 DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
153
154 /* copy from a bounce buffer, if necessary */
155 if (status && HDATA(instance)->dma_bounce_buffer) {
156 if (SCpnt && SCpnt->use_sg) {
157 #if 0
158 panic ("scsi%d: incomplete s/g support",
159 instance->host_no);
160 #else
161 if( HDATA(instance)->dma_dir )
162 memcpy (SCpnt->SCp.ptr,
163 HDATA(instance)->dma_bounce_buffer,
164 SCpnt->SCp.this_residual);
165 scsi_free (HDATA(instance)->dma_bounce_buffer,
166 HDATA(instance)->dma_bounce_len);
167 HDATA(instance)->dma_bounce_buffer = NULL;
168 HDATA(instance)->dma_bounce_len = 0;
169
170 #endif
171 } else {
172 if (HDATA(instance)->dma_dir && SCpnt)
173 memcpy (SCpnt->request_buffer,
174 HDATA(instance)->dma_bounce_buffer,
175 SCpnt->request_bufflen);
176
177 scsi_free (HDATA(instance)->dma_bounce_buffer,
178 HDATA(instance)->dma_bounce_len);
179 HDATA(instance)->dma_bounce_buffer = NULL;
180 HDATA(instance)->dma_bounce_len = 0;
181 }
182 }
183 }
184
185 static int num_a2091 = 0;
186
187 int __init a2091_detect(Scsi_Host_Template *tpnt)
188 {
189 static unsigned char called = 0;
190 struct Scsi_Host *instance;
191 unsigned long address;
192 struct zorro_dev *z = NULL;
193
194 if (!MACH_IS_AMIGA || called)
195 return 0;
196 called = 1;
197
198 tpnt->proc_name = "A2091";
199 tpnt->proc_info = &wd33c93_proc_info;
200
201 while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
202 if (z->id != ZORRO_PROD_CBM_A590_A2091_1 &&
203 z->id != ZORRO_PROD_CBM_A590_A2091_2)
204 continue;
205 address = z->resource.start;
206 if (!request_mem_region(address, 256, "wd33c93"))
207 continue;
208
209 instance = scsi_register (tpnt, sizeof (struct WD33C93_hostdata));
210 if (instance == NULL) {
211 release_mem_region(address, 256);
212 continue;
213 }
214 instance->base = ZTWO_VADDR(address);
215 instance->irq = IRQ_AMIGA_PORTS;
216 instance->unique_id = z->slotaddr;
217 DMA(instance)->DAWR = DAWR_A2091;
218 wd33c93_init(instance, (wd33c93_regs *)&(DMA(instance)->SASR),
219 dma_setup, dma_stop, WD33C93_FS_8_10);
220 if (num_a2091++ == 0) {
221 first_instance = instance;
222 a2091_template = instance->hostt;
223 request_irq(IRQ_AMIGA_PORTS, a2091_intr, SA_SHIRQ, "A2091 SCSI",
224 a2091_intr);
225 }
226 DMA(instance)->CNTR = CNTR_PDMD | CNTR_INTEN;
227 }
228
229 return num_a2091;
230 }
231
232 #define HOSTS_C
233
234 static Scsi_Host_Template driver_template = A2091_SCSI;
235
236 #include "scsi_module.c"
237
238 int a2091_release(struct Scsi_Host *instance)
239 {
240 #ifdef MODULE
241 DMA(instance)->CNTR = 0;
242 release_mem_region(ZTWO_PADDR(instance->base), 256);
243 if (--num_a2091 == 0)
244 free_irq(IRQ_AMIGA_PORTS, a2091_intr);
245 wd33c93_release();
246 #endif
247 return 1;
248 }
249