1 #include <linux/types.h>
2 #include <linux/init.h>
3 #include <linux/interrupt.h>
4 #include <linux/mm.h>
5 #include <linux/slab.h>
6 #include <linux/spinlock.h>
7 #include <linux/zorro.h>
8 #include <linux/module.h>
9
10 #include <asm/page.h>
11 #include <asm/pgtable.h>
12 #include <asm/amigaints.h>
13 #include <asm/amigahw.h>
14
15 #include "scsi.h"
16 #include "wd33c93.h"
17 #include "a2091.h"
18
19
20 struct a2091_hostdata {
21 struct WD33C93_hostdata wh;
22 struct a2091_scsiregs *regs;
23 };
24
a2091_intr(int irq,void * data)25 static irqreturn_t a2091_intr(int irq, void *data)
26 {
27 struct Scsi_Host *instance = data;
28 struct a2091_hostdata *hdata = shost_priv(instance);
29 unsigned int status = hdata->regs->ISTR;
30 unsigned long flags;
31
32 if (!(status & (ISTR_INT_F | ISTR_INT_P)) || !(status & ISTR_INTS))
33 return IRQ_NONE;
34
35 spin_lock_irqsave(instance->host_lock, flags);
36 wd33c93_intr(instance);
37 spin_unlock_irqrestore(instance->host_lock, flags);
38 return IRQ_HANDLED;
39 }
40
dma_setup(struct scsi_cmnd * cmd,int dir_in)41 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
42 {
43 struct Scsi_Host *instance = cmd->device->host;
44 struct a2091_hostdata *hdata = shost_priv(instance);
45 struct WD33C93_hostdata *wh = &hdata->wh;
46 struct a2091_scsiregs *regs = hdata->regs;
47 unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
48 unsigned long addr = virt_to_bus(cmd->SCp.ptr);
49
50 /* don't allow DMA if the physical address is bad */
51 if (addr & A2091_XFER_MASK) {
52 wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
53 wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
54 GFP_KERNEL);
55
56 /* can't allocate memory; use PIO */
57 if (!wh->dma_bounce_buffer) {
58 wh->dma_bounce_len = 0;
59 return 1;
60 }
61
62 /* get the physical address of the bounce buffer */
63 addr = virt_to_bus(wh->dma_bounce_buffer);
64
65 /* the bounce buffer may not be in the first 16M of physmem */
66 if (addr & A2091_XFER_MASK) {
67 /* we could use chipmem... maybe later */
68 kfree(wh->dma_bounce_buffer);
69 wh->dma_bounce_buffer = NULL;
70 wh->dma_bounce_len = 0;
71 return 1;
72 }
73
74 if (!dir_in) {
75 /* copy to bounce buffer for a write */
76 memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr,
77 cmd->SCp.this_residual);
78 }
79 }
80
81 /* setup dma direction */
82 if (!dir_in)
83 cntr |= CNTR_DDIR;
84
85 /* remember direction */
86 wh->dma_dir = dir_in;
87
88 regs->CNTR = cntr;
89
90 /* setup DMA *physical* address */
91 regs->ACR = addr;
92
93 if (dir_in) {
94 /* invalidate any cache */
95 cache_clear(addr, cmd->SCp.this_residual);
96 } else {
97 /* push any dirty cache */
98 cache_push(addr, cmd->SCp.this_residual);
99 }
100 /* start DMA */
101 regs->ST_DMA = 1;
102
103 /* return success */
104 return 0;
105 }
106
dma_stop(struct Scsi_Host * instance,struct scsi_cmnd * SCpnt,int status)107 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
108 int status)
109 {
110 struct a2091_hostdata *hdata = shost_priv(instance);
111 struct WD33C93_hostdata *wh = &hdata->wh;
112 struct a2091_scsiregs *regs = hdata->regs;
113
114 /* disable SCSI interrupts */
115 unsigned short cntr = CNTR_PDMD;
116
117 if (!wh->dma_dir)
118 cntr |= CNTR_DDIR;
119
120 /* disable SCSI interrupts */
121 regs->CNTR = cntr;
122
123 /* flush if we were reading */
124 if (wh->dma_dir) {
125 regs->FLUSH = 1;
126 while (!(regs->ISTR & ISTR_FE_FLG))
127 ;
128 }
129
130 /* clear a possible interrupt */
131 regs->CINT = 1;
132
133 /* stop DMA */
134 regs->SP_DMA = 1;
135
136 /* restore the CONTROL bits (minus the direction flag) */
137 regs->CNTR = CNTR_PDMD | CNTR_INTEN;
138
139 /* copy from a bounce buffer, if necessary */
140 if (status && wh->dma_bounce_buffer) {
141 if (wh->dma_dir)
142 memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer,
143 SCpnt->SCp.this_residual);
144 kfree(wh->dma_bounce_buffer);
145 wh->dma_bounce_buffer = NULL;
146 wh->dma_bounce_len = 0;
147 }
148 }
149
a2091_bus_reset(struct scsi_cmnd * cmd)150 static int a2091_bus_reset(struct scsi_cmnd *cmd)
151 {
152 struct Scsi_Host *instance = cmd->device->host;
153
154 /* FIXME perform bus-specific reset */
155
156 /* FIXME 2: kill this function, and let midlayer fall back
157 to the same action, calling wd33c93_host_reset() */
158
159 spin_lock_irq(instance->host_lock);
160 wd33c93_host_reset(cmd);
161 spin_unlock_irq(instance->host_lock);
162
163 return SUCCESS;
164 }
165
166 static struct scsi_host_template a2091_scsi_template = {
167 .module = THIS_MODULE,
168 .name = "Commodore A2091/A590 SCSI",
169 .show_info = wd33c93_show_info,
170 .write_info = wd33c93_write_info,
171 .proc_name = "A2901",
172 .queuecommand = wd33c93_queuecommand,
173 .eh_abort_handler = wd33c93_abort,
174 .eh_bus_reset_handler = a2091_bus_reset,
175 .eh_host_reset_handler = wd33c93_host_reset,
176 .can_queue = CAN_QUEUE,
177 .this_id = 7,
178 .sg_tablesize = SG_ALL,
179 .cmd_per_lun = CMD_PER_LUN,
180 .use_clustering = DISABLE_CLUSTERING
181 };
182
a2091_probe(struct zorro_dev * z,const struct zorro_device_id * ent)183 static int a2091_probe(struct zorro_dev *z, const struct zorro_device_id *ent)
184 {
185 struct Scsi_Host *instance;
186 int error;
187 struct a2091_scsiregs *regs;
188 wd33c93_regs wdregs;
189 struct a2091_hostdata *hdata;
190
191 if (!request_mem_region(z->resource.start, 256, "wd33c93"))
192 return -EBUSY;
193
194 instance = scsi_host_alloc(&a2091_scsi_template,
195 sizeof(struct a2091_hostdata));
196 if (!instance) {
197 error = -ENOMEM;
198 goto fail_alloc;
199 }
200
201 instance->irq = IRQ_AMIGA_PORTS;
202 instance->unique_id = z->slotaddr;
203
204 regs = (struct a2091_scsiregs *)ZTWO_VADDR(z->resource.start);
205 regs->DAWR = DAWR_A2091;
206
207 wdregs.SASR = ®s->SASR;
208 wdregs.SCMD = ®s->SCMD;
209
210 hdata = shost_priv(instance);
211 hdata->wh.no_sync = 0xff;
212 hdata->wh.fast = 0;
213 hdata->wh.dma_mode = CTRL_DMA;
214 hdata->regs = regs;
215
216 wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_8_10);
217 error = request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED,
218 "A2091 SCSI", instance);
219 if (error)
220 goto fail_irq;
221
222 regs->CNTR = CNTR_PDMD | CNTR_INTEN;
223
224 error = scsi_add_host(instance, NULL);
225 if (error)
226 goto fail_host;
227
228 zorro_set_drvdata(z, instance);
229
230 scsi_scan_host(instance);
231 return 0;
232
233 fail_host:
234 free_irq(IRQ_AMIGA_PORTS, instance);
235 fail_irq:
236 scsi_host_put(instance);
237 fail_alloc:
238 release_mem_region(z->resource.start, 256);
239 return error;
240 }
241
a2091_remove(struct zorro_dev * z)242 static void a2091_remove(struct zorro_dev *z)
243 {
244 struct Scsi_Host *instance = zorro_get_drvdata(z);
245 struct a2091_hostdata *hdata = shost_priv(instance);
246
247 hdata->regs->CNTR = 0;
248 scsi_remove_host(instance);
249 free_irq(IRQ_AMIGA_PORTS, instance);
250 scsi_host_put(instance);
251 release_mem_region(z->resource.start, 256);
252 }
253
254 static struct zorro_device_id a2091_zorro_tbl[] = {
255 { ZORRO_PROD_CBM_A590_A2091_1 },
256 { ZORRO_PROD_CBM_A590_A2091_2 },
257 { 0 }
258 };
259 MODULE_DEVICE_TABLE(zorro, a2091_zorro_tbl);
260
261 static struct zorro_driver a2091_driver = {
262 .name = "a2091",
263 .id_table = a2091_zorro_tbl,
264 .probe = a2091_probe,
265 .remove = a2091_remove,
266 };
267
a2091_init(void)268 static int __init a2091_init(void)
269 {
270 return zorro_register_driver(&a2091_driver);
271 }
272 module_init(a2091_init);
273
a2091_exit(void)274 static void __exit a2091_exit(void)
275 {
276 zorro_unregister_driver(&a2091_driver);
277 }
278 module_exit(a2091_exit);
279
280 MODULE_DESCRIPTION("Commodore A2091/A590 SCSI");
281 MODULE_LICENSE("GPL");
282