[SCSI] lpfc 8.3.25: Adapter Interface fixes and changes
[linux-2.6.git] / drivers / scsi / a2091.c
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
9 #include <asm/page.h>
10 #include <asm/pgtable.h>
11 #include <asm/amigaints.h>
12 #include <asm/amigahw.h>
13
14 #include "scsi.h"
15 #include "wd33c93.h"
16 #include "a2091.h"
17
18
19 struct a2091_hostdata {
20         struct WD33C93_hostdata wh;
21         struct a2091_scsiregs *regs;
22 };
23
24 static irqreturn_t a2091_intr(int irq, void *data)
25 {
26         struct Scsi_Host *instance = data;
27         struct a2091_hostdata *hdata = shost_priv(instance);
28         unsigned int status = hdata->regs->ISTR;
29         unsigned long flags;
30
31         if (!(status & (ISTR_INT_F | ISTR_INT_P)) || !(status & ISTR_INTS))
32                 return IRQ_NONE;
33
34         spin_lock_irqsave(instance->host_lock, flags);
35         wd33c93_intr(instance);
36         spin_unlock_irqrestore(instance->host_lock, flags);
37         return IRQ_HANDLED;
38 }
39
40 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
41 {
42         struct Scsi_Host *instance = cmd->device->host;
43         struct a2091_hostdata *hdata = shost_priv(instance);
44         struct WD33C93_hostdata *wh = &hdata->wh;
45         struct a2091_scsiregs *regs = hdata->regs;
46         unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
47         unsigned long addr = virt_to_bus(cmd->SCp.ptr);
48
49         /* don't allow DMA if the physical address is bad */
50         if (addr & A2091_XFER_MASK) {
51                 wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
52                 wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
53                                                 GFP_KERNEL);
54
55                 /* can't allocate memory; use PIO */
56                 if (!wh->dma_bounce_buffer) {
57                         wh->dma_bounce_len = 0;
58                         return 1;
59                 }
60
61                 /* get the physical address of the bounce buffer */
62                 addr = virt_to_bus(wh->dma_bounce_buffer);
63
64                 /* the bounce buffer may not be in the first 16M of physmem */
65                 if (addr & A2091_XFER_MASK) {
66                         /* we could use chipmem... maybe later */
67                         kfree(wh->dma_bounce_buffer);
68                         wh->dma_bounce_buffer = NULL;
69                         wh->dma_bounce_len = 0;
70                         return 1;
71                 }
72
73                 if (!dir_in) {
74                         /* copy to bounce buffer for a write */
75                         memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr,
76                                cmd->SCp.this_residual);
77                 }
78         }
79
80         /* setup dma direction */
81         if (!dir_in)
82                 cntr |= CNTR_DDIR;
83
84         /* remember direction */
85         wh->dma_dir = dir_in;
86
87         regs->CNTR = cntr;
88
89         /* setup DMA *physical* address */
90         regs->ACR = addr;
91
92         if (dir_in) {
93                 /* invalidate any cache */
94                 cache_clear(addr, cmd->SCp.this_residual);
95         } else {
96                 /* push any dirty cache */
97                 cache_push(addr, cmd->SCp.this_residual);
98         }
99         /* start DMA */
100         regs->ST_DMA = 1;
101
102         /* return success */
103         return 0;
104 }
105
106 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
107                      int status)
108 {
109         struct a2091_hostdata *hdata = shost_priv(instance);
110         struct WD33C93_hostdata *wh = &hdata->wh;
111         struct a2091_scsiregs *regs = hdata->regs;
112
113         /* disable SCSI interrupts */
114         unsigned short cntr = CNTR_PDMD;
115
116         if (!wh->dma_dir)
117                 cntr |= CNTR_DDIR;
118
119         /* disable SCSI interrupts */
120         regs->CNTR = cntr;
121
122         /* flush if we were reading */
123         if (wh->dma_dir) {
124                 regs->FLUSH = 1;
125                 while (!(regs->ISTR & ISTR_FE_FLG))
126                         ;
127         }
128
129         /* clear a possible interrupt */
130         regs->CINT = 1;
131
132         /* stop DMA */
133         regs->SP_DMA = 1;
134
135         /* restore the CONTROL bits (minus the direction flag) */
136         regs->CNTR = CNTR_PDMD | CNTR_INTEN;
137
138         /* copy from a bounce buffer, if necessary */
139         if (status && wh->dma_bounce_buffer) {
140                 if (wh->dma_dir)
141                         memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer,
142                                SCpnt->SCp.this_residual);
143                 kfree(wh->dma_bounce_buffer);
144                 wh->dma_bounce_buffer = NULL;
145                 wh->dma_bounce_len = 0;
146         }
147 }
148
149 static int a2091_bus_reset(struct scsi_cmnd *cmd)
150 {
151         struct Scsi_Host *instance = cmd->device->host;
152
153         /* FIXME perform bus-specific reset */
154
155         /* FIXME 2: kill this function, and let midlayer fall back
156            to the same action, calling wd33c93_host_reset() */
157
158         spin_lock_irq(instance->host_lock);
159         wd33c93_host_reset(cmd);
160         spin_unlock_irq(instance->host_lock);
161
162         return SUCCESS;
163 }
164
165 static struct scsi_host_template a2091_scsi_template = {
166         .module                 = THIS_MODULE,
167         .name                   = "Commodore A2091/A590 SCSI",
168         .proc_info              = wd33c93_proc_info,
169         .proc_name              = "A2901",
170         .queuecommand           = wd33c93_queuecommand,
171         .eh_abort_handler       = wd33c93_abort,
172         .eh_bus_reset_handler   = a2091_bus_reset,
173         .eh_host_reset_handler  = wd33c93_host_reset,
174         .can_queue              = CAN_QUEUE,
175         .this_id                = 7,
176         .sg_tablesize           = SG_ALL,
177         .cmd_per_lun            = CMD_PER_LUN,
178         .use_clustering         = DISABLE_CLUSTERING
179 };
180
181 static int __devinit a2091_probe(struct zorro_dev *z,
182                                  const struct zorro_device_id *ent)
183 {
184         struct Scsi_Host *instance;
185         int error;
186         struct a2091_scsiregs *regs;
187         wd33c93_regs wdregs;
188         struct a2091_hostdata *hdata;
189
190         if (!request_mem_region(z->resource.start, 256, "wd33c93"))
191                 return -EBUSY;
192
193         instance = scsi_host_alloc(&a2091_scsi_template,
194                                    sizeof(struct a2091_hostdata));
195         if (!instance) {
196                 error = -ENOMEM;
197                 goto fail_alloc;
198         }
199
200         instance->irq = IRQ_AMIGA_PORTS;
201         instance->unique_id = z->slotaddr;
202
203         regs = (struct a2091_scsiregs *)ZTWO_VADDR(z->resource.start);
204         regs->DAWR = DAWR_A2091;
205
206         wdregs.SASR = &regs->SASR;
207         wdregs.SCMD = &regs->SCMD;
208
209         hdata = shost_priv(instance);
210         hdata->wh.no_sync = 0xff;
211         hdata->wh.fast = 0;
212         hdata->wh.dma_mode = CTRL_DMA;
213         hdata->regs = regs;
214
215         wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_8_10);
216         error = request_irq(IRQ_AMIGA_PORTS, a2091_intr, IRQF_SHARED,
217                             "A2091 SCSI", instance);
218         if (error)
219                 goto fail_irq;
220
221         regs->CNTR = CNTR_PDMD | CNTR_INTEN;
222
223         error = scsi_add_host(instance, NULL);
224         if (error)
225                 goto fail_host;
226
227         zorro_set_drvdata(z, instance);
228
229         scsi_scan_host(instance);
230         return 0;
231
232 fail_host:
233         free_irq(IRQ_AMIGA_PORTS, instance);
234 fail_irq:
235         scsi_host_put(instance);
236 fail_alloc:
237         release_mem_region(z->resource.start, 256);
238         return error;
239 }
240
241 static void __devexit a2091_remove(struct zorro_dev *z)
242 {
243         struct Scsi_Host *instance = zorro_get_drvdata(z);
244         struct a2091_hostdata *hdata = shost_priv(instance);
245
246         hdata->regs->CNTR = 0;
247         scsi_remove_host(instance);
248         free_irq(IRQ_AMIGA_PORTS, instance);
249         scsi_host_put(instance);
250         release_mem_region(z->resource.start, 256);
251 }
252
253 static struct zorro_device_id a2091_zorro_tbl[] __devinitdata = {
254         { ZORRO_PROD_CBM_A590_A2091_1 },
255         { ZORRO_PROD_CBM_A590_A2091_2 },
256         { 0 }
257 };
258 MODULE_DEVICE_TABLE(zorro, a2091_zorro_tbl);
259
260 static struct zorro_driver a2091_driver = {
261         .name           = "a2091",
262         .id_table       = a2091_zorro_tbl,
263         .probe          = a2091_probe,
264         .remove         = __devexit_p(a2091_remove),
265 };
266
267 static int __init a2091_init(void)
268 {
269         return zorro_register_driver(&a2091_driver);
270 }
271 module_init(a2091_init);
272
273 static void __exit a2091_exit(void)
274 {
275         zorro_unregister_driver(&a2091_driver);
276 }
277 module_exit(a2091_exit);
278
279 MODULE_DESCRIPTION("Commodore A2091/A590 SCSI");
280 MODULE_LICENSE("GPL");