Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/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 #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 
 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 
 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 
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 
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 
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 = ZTWO_VADDR(z->resource.start);
205         regs->DAWR = DAWR_A2091;
206 
207         wdregs.SASR = &regs->SASR;
208         wdregs.SCMD = &regs->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 
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 
268 static int __init a2091_init(void)
269 {
270         return zorro_register_driver(&a2091_driver);
271 }
272 module_init(a2091_init);
273 
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 

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