Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 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

Linux/drivers/scsi/a3000.c

  1 #include <linux/types.h>
  2 #include <linux/mm.h>
  3 #include <linux/ioport.h>
  4 #include <linux/init.h>
  5 #include <linux/slab.h>
  6 #include <linux/spinlock.h>
  7 #include <linux/interrupt.h>
  8 #include <linux/platform_device.h>
  9 #include <linux/module.h>
 10 
 11 #include <asm/page.h>
 12 #include <asm/pgtable.h>
 13 #include <asm/amigaints.h>
 14 #include <asm/amigahw.h>
 15 
 16 #include "scsi.h"
 17 #include "wd33c93.h"
 18 #include "a3000.h"
 19 
 20 
 21 struct a3000_hostdata {
 22         struct WD33C93_hostdata wh;
 23         struct a3000_scsiregs *regs;
 24 };
 25 
 26 static irqreturn_t a3000_intr(int irq, void *data)
 27 {
 28         struct Scsi_Host *instance = data;
 29         struct a3000_hostdata *hdata = shost_priv(instance);
 30         unsigned int status = hdata->regs->ISTR;
 31         unsigned long flags;
 32 
 33         if (!(status & ISTR_INT_P))
 34                 return IRQ_NONE;
 35         if (status & ISTR_INTS) {
 36                 spin_lock_irqsave(instance->host_lock, flags);
 37                 wd33c93_intr(instance);
 38                 spin_unlock_irqrestore(instance->host_lock, flags);
 39                 return IRQ_HANDLED;
 40         }
 41         pr_warning("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
 42         return IRQ_NONE;
 43 }
 44 
 45 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
 46 {
 47         struct Scsi_Host *instance = cmd->device->host;
 48         struct a3000_hostdata *hdata = shost_priv(instance);
 49         struct WD33C93_hostdata *wh = &hdata->wh;
 50         struct a3000_scsiregs *regs = hdata->regs;
 51         unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
 52         unsigned long addr = virt_to_bus(cmd->SCp.ptr);
 53 
 54         /*
 55          * if the physical address has the wrong alignment, or if
 56          * physical address is bad, or if it is a write and at the
 57          * end of a physical memory chunk, then allocate a bounce
 58          * buffer
 59          */
 60         if (addr & A3000_XFER_MASK) {
 61                 wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
 62                 wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
 63                                                 GFP_KERNEL);
 64 
 65                 /* can't allocate memory; use PIO */
 66                 if (!wh->dma_bounce_buffer) {
 67                         wh->dma_bounce_len = 0;
 68                         return 1;
 69                 }
 70 
 71                 if (!dir_in) {
 72                         /* copy to bounce buffer for a write */
 73                         memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr,
 74                                cmd->SCp.this_residual);
 75                 }
 76 
 77                 addr = virt_to_bus(wh->dma_bounce_buffer);
 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 
100         /* start DMA */
101         mb();                   /* make sure setup is completed */
102         regs->ST_DMA = 1;
103         mb();                   /* make sure DMA has started before next IO */
104 
105         /* return success */
106         return 0;
107 }
108 
109 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
110                      int status)
111 {
112         struct a3000_hostdata *hdata = shost_priv(instance);
113         struct WD33C93_hostdata *wh = &hdata->wh;
114         struct a3000_scsiregs *regs = hdata->regs;
115 
116         /* disable SCSI interrupts */
117         unsigned short cntr = CNTR_PDMD;
118 
119         if (!wh->dma_dir)
120                 cntr |= CNTR_DDIR;
121 
122         regs->CNTR = cntr;
123         mb();                   /* make sure CNTR is updated before next IO */
124 
125         /* flush if we were reading */
126         if (wh->dma_dir) {
127                 regs->FLUSH = 1;
128                 mb();           /* don't allow prefetch */
129                 while (!(regs->ISTR & ISTR_FE_FLG))
130                         barrier();
131                 mb();           /* no IO until FLUSH is done */
132         }
133 
134         /* clear a possible interrupt */
135         /* I think that this CINT is only necessary if you are
136          * using the terminal count features.   HM 7 Mar 1994
137          */
138         regs->CINT = 1;
139 
140         /* stop DMA */
141         regs->SP_DMA = 1;
142         mb();                   /* make sure DMA is stopped before next IO */
143 
144         /* restore the CONTROL bits (minus the direction flag) */
145         regs->CNTR = CNTR_PDMD | CNTR_INTEN;
146         mb();                   /* make sure CNTR is updated before next IO */
147 
148         /* copy from a bounce buffer, if necessary */
149         if (status && wh->dma_bounce_buffer) {
150                 if (SCpnt) {
151                         if (wh->dma_dir && SCpnt)
152                                 memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer,
153                                        SCpnt->SCp.this_residual);
154                         kfree(wh->dma_bounce_buffer);
155                         wh->dma_bounce_buffer = NULL;
156                         wh->dma_bounce_len = 0;
157                 } else {
158                         kfree(wh->dma_bounce_buffer);
159                         wh->dma_bounce_buffer = NULL;
160                         wh->dma_bounce_len = 0;
161                 }
162         }
163 }
164 
165 static int a3000_bus_reset(struct scsi_cmnd *cmd)
166 {
167         struct Scsi_Host *instance = cmd->device->host;
168 
169         /* FIXME perform bus-specific reset */
170 
171         /* FIXME 2: kill this entire function, which should
172            cause mid-layer to call wd33c93_host_reset anyway? */
173 
174         spin_lock_irq(instance->host_lock);
175         wd33c93_host_reset(cmd);
176         spin_unlock_irq(instance->host_lock);
177 
178         return SUCCESS;
179 }
180 
181 static struct scsi_host_template amiga_a3000_scsi_template = {
182         .module                 = THIS_MODULE,
183         .name                   = "Amiga 3000 built-in SCSI",
184         .show_info              = wd33c93_show_info,
185         .write_info             = wd33c93_write_info,
186         .proc_name              = "A3000",
187         .queuecommand           = wd33c93_queuecommand,
188         .eh_abort_handler       = wd33c93_abort,
189         .eh_bus_reset_handler   = a3000_bus_reset,
190         .eh_host_reset_handler  = wd33c93_host_reset,
191         .can_queue              = CAN_QUEUE,
192         .this_id                = 7,
193         .sg_tablesize           = SG_ALL,
194         .cmd_per_lun            = CMD_PER_LUN,
195         .use_clustering         = ENABLE_CLUSTERING
196 };
197 
198 static int __init amiga_a3000_scsi_probe(struct platform_device *pdev)
199 {
200         struct resource *res;
201         struct Scsi_Host *instance;
202         int error;
203         struct a3000_scsiregs *regs;
204         wd33c93_regs wdregs;
205         struct a3000_hostdata *hdata;
206 
207         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
208         if (!res)
209                 return -ENODEV;
210 
211         if (!request_mem_region(res->start, resource_size(res), "wd33c93"))
212                 return -EBUSY;
213 
214         instance = scsi_host_alloc(&amiga_a3000_scsi_template,
215                                    sizeof(struct a3000_hostdata));
216         if (!instance) {
217                 error = -ENOMEM;
218                 goto fail_alloc;
219         }
220 
221         instance->irq = IRQ_AMIGA_PORTS;
222 
223         regs = ZTWO_VADDR(res->start);
224         regs->DAWR = DAWR_A3000;
225 
226         wdregs.SASR = &regs->SASR;
227         wdregs.SCMD = &regs->SCMD;
228 
229         hdata = shost_priv(instance);
230         hdata->wh.no_sync = 0xff;
231         hdata->wh.fast = 0;
232         hdata->wh.dma_mode = CTRL_DMA;
233         hdata->regs = regs;
234 
235         wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_12_15);
236         error = request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED,
237                             "A3000 SCSI", instance);
238         if (error)
239                 goto fail_irq;
240 
241         regs->CNTR = CNTR_PDMD | CNTR_INTEN;
242 
243         error = scsi_add_host(instance, NULL);
244         if (error)
245                 goto fail_host;
246 
247         platform_set_drvdata(pdev, instance);
248 
249         scsi_scan_host(instance);
250         return 0;
251 
252 fail_host:
253         free_irq(IRQ_AMIGA_PORTS, instance);
254 fail_irq:
255         scsi_host_put(instance);
256 fail_alloc:
257         release_mem_region(res->start, resource_size(res));
258         return error;
259 }
260 
261 static int __exit amiga_a3000_scsi_remove(struct platform_device *pdev)
262 {
263         struct Scsi_Host *instance = platform_get_drvdata(pdev);
264         struct a3000_hostdata *hdata = shost_priv(instance);
265         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
266 
267         hdata->regs->CNTR = 0;
268         scsi_remove_host(instance);
269         free_irq(IRQ_AMIGA_PORTS, instance);
270         scsi_host_put(instance);
271         release_mem_region(res->start, resource_size(res));
272         return 0;
273 }
274 
275 static struct platform_driver amiga_a3000_scsi_driver = {
276         .remove = __exit_p(amiga_a3000_scsi_remove),
277         .driver   = {
278                 .name   = "amiga-a3000-scsi",
279                 .owner  = THIS_MODULE,
280         },
281 };
282 
283 module_platform_driver_probe(amiga_a3000_scsi_driver, amiga_a3000_scsi_probe);
284 
285 MODULE_DESCRIPTION("Amiga 3000 built-in SCSI");
286 MODULE_LICENSE("GPL");
287 MODULE_ALIAS("platform:amiga-a3000-scsi");
288 

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