config: tegra3: enable /dev mount with ACL
[linux-2.6.git] / 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
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 "a3000.h"
18
19
20 struct a3000_hostdata {
21         struct WD33C93_hostdata wh;
22         struct a3000_scsiregs *regs;
23 };
24
25 static irqreturn_t a3000_intr(int irq, void *data)
26 {
27         struct Scsi_Host *instance = data;
28         struct a3000_hostdata *hdata = shost_priv(instance);
29         unsigned int status = hdata->regs->ISTR;
30         unsigned long flags;
31
32         if (!(status & ISTR_INT_P))
33                 return IRQ_NONE;
34         if (status & ISTR_INTS) {
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         pr_warning("Non-serviced A3000 SCSI-interrupt? ISTR = %02x\n", status);
41         return IRQ_NONE;
42 }
43
44 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
45 {
46         struct Scsi_Host *instance = cmd->device->host;
47         struct a3000_hostdata *hdata = shost_priv(instance);
48         struct WD33C93_hostdata *wh = &hdata->wh;
49         struct a3000_scsiregs *regs = hdata->regs;
50         unsigned short cntr = CNTR_PDMD | CNTR_INTEN;
51         unsigned long addr = virt_to_bus(cmd->SCp.ptr);
52
53         /*
54          * if the physical address has the wrong alignment, or if
55          * physical address is bad, or if it is a write and at the
56          * end of a physical memory chunk, then allocate a bounce
57          * buffer
58          */
59         if (addr & A3000_XFER_MASK) {
60                 wh->dma_bounce_len = (cmd->SCp.this_residual + 511) & ~0x1ff;
61                 wh->dma_bounce_buffer = kmalloc(wh->dma_bounce_len,
62                                                 GFP_KERNEL);
63
64                 /* can't allocate memory; use PIO */
65                 if (!wh->dma_bounce_buffer) {
66                         wh->dma_bounce_len = 0;
67                         return 1;
68                 }
69
70                 if (!dir_in) {
71                         /* copy to bounce buffer for a write */
72                         memcpy(wh->dma_bounce_buffer, cmd->SCp.ptr,
73                                cmd->SCp.this_residual);
74                 }
75
76                 addr = virt_to_bus(wh->dma_bounce_buffer);
77         }
78
79         /* setup dma direction */
80         if (!dir_in)
81                 cntr |= CNTR_DDIR;
82
83         /* remember direction */
84         wh->dma_dir = dir_in;
85
86         regs->CNTR = cntr;
87
88         /* setup DMA *physical* address */
89         regs->ACR = addr;
90
91         if (dir_in) {
92                 /* invalidate any cache */
93                 cache_clear(addr, cmd->SCp.this_residual);
94         } else {
95                 /* push any dirty cache */
96                 cache_push(addr, cmd->SCp.this_residual);
97         }
98
99         /* start DMA */
100         mb();                   /* make sure setup is completed */
101         regs->ST_DMA = 1;
102         mb();                   /* make sure DMA has started before next IO */
103
104         /* return success */
105         return 0;
106 }
107
108 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
109                      int status)
110 {
111         struct a3000_hostdata *hdata = shost_priv(instance);
112         struct WD33C93_hostdata *wh = &hdata->wh;
113         struct a3000_scsiregs *regs = hdata->regs;
114
115         /* disable SCSI interrupts */
116         unsigned short cntr = CNTR_PDMD;
117
118         if (!wh->dma_dir)
119                 cntr |= CNTR_DDIR;
120
121         regs->CNTR = cntr;
122         mb();                   /* make sure CNTR is updated before next IO */
123
124         /* flush if we were reading */
125         if (wh->dma_dir) {
126                 regs->FLUSH = 1;
127                 mb();           /* don't allow prefetch */
128                 while (!(regs->ISTR & ISTR_FE_FLG))
129                         barrier();
130                 mb();           /* no IO until FLUSH is done */
131         }
132
133         /* clear a possible interrupt */
134         /* I think that this CINT is only necessary if you are
135          * using the terminal count features.   HM 7 Mar 1994
136          */
137         regs->CINT = 1;
138
139         /* stop DMA */
140         regs->SP_DMA = 1;
141         mb();                   /* make sure DMA is stopped before next IO */
142
143         /* restore the CONTROL bits (minus the direction flag) */
144         regs->CNTR = CNTR_PDMD | CNTR_INTEN;
145         mb();                   /* make sure CNTR is updated before next IO */
146
147         /* copy from a bounce buffer, if necessary */
148         if (status && wh->dma_bounce_buffer) {
149                 if (SCpnt) {
150                         if (wh->dma_dir && SCpnt)
151                                 memcpy(SCpnt->SCp.ptr, wh->dma_bounce_buffer,
152                                        SCpnt->SCp.this_residual);
153                         kfree(wh->dma_bounce_buffer);
154                         wh->dma_bounce_buffer = NULL;
155                         wh->dma_bounce_len = 0;
156                 } else {
157                         kfree(wh->dma_bounce_buffer);
158                         wh->dma_bounce_buffer = NULL;
159                         wh->dma_bounce_len = 0;
160                 }
161         }
162 }
163
164 static int a3000_bus_reset(struct scsi_cmnd *cmd)
165 {
166         struct Scsi_Host *instance = cmd->device->host;
167
168         /* FIXME perform bus-specific reset */
169
170         /* FIXME 2: kill this entire function, which should
171            cause mid-layer to call wd33c93_host_reset anyway? */
172
173         spin_lock_irq(instance->host_lock);
174         wd33c93_host_reset(cmd);
175         spin_unlock_irq(instance->host_lock);
176
177         return SUCCESS;
178 }
179
180 static struct scsi_host_template amiga_a3000_scsi_template = {
181         .module                 = THIS_MODULE,
182         .name                   = "Amiga 3000 built-in SCSI",
183         .proc_info              = wd33c93_proc_info,
184         .proc_name              = "A3000",
185         .queuecommand           = wd33c93_queuecommand,
186         .eh_abort_handler       = wd33c93_abort,
187         .eh_bus_reset_handler   = a3000_bus_reset,
188         .eh_host_reset_handler  = wd33c93_host_reset,
189         .can_queue              = CAN_QUEUE,
190         .this_id                = 7,
191         .sg_tablesize           = SG_ALL,
192         .cmd_per_lun            = CMD_PER_LUN,
193         .use_clustering         = ENABLE_CLUSTERING
194 };
195
196 static int __init amiga_a3000_scsi_probe(struct platform_device *pdev)
197 {
198         struct resource *res;
199         struct Scsi_Host *instance;
200         int error;
201         struct a3000_scsiregs *regs;
202         wd33c93_regs wdregs;
203         struct a3000_hostdata *hdata;
204
205         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
206         if (!res)
207                 return -ENODEV;
208
209         if (!request_mem_region(res->start, resource_size(res), "wd33c93"))
210                 return -EBUSY;
211
212         instance = scsi_host_alloc(&amiga_a3000_scsi_template,
213                                    sizeof(struct a3000_hostdata));
214         if (!instance) {
215                 error = -ENOMEM;
216                 goto fail_alloc;
217         }
218
219         instance->irq = IRQ_AMIGA_PORTS;
220
221         regs = (struct a3000_scsiregs *)ZTWO_VADDR(res->start);
222         regs->DAWR = DAWR_A3000;
223
224         wdregs.SASR = &regs->SASR;
225         wdregs.SCMD = &regs->SCMD;
226
227         hdata = shost_priv(instance);
228         hdata->wh.no_sync = 0xff;
229         hdata->wh.fast = 0;
230         hdata->wh.dma_mode = CTRL_DMA;
231         hdata->regs = regs;
232
233         wd33c93_init(instance, wdregs, dma_setup, dma_stop, WD33C93_FS_12_15);
234         error = request_irq(IRQ_AMIGA_PORTS, a3000_intr, IRQF_SHARED,
235                             "A3000 SCSI", instance);
236         if (error)
237                 goto fail_irq;
238
239         regs->CNTR = CNTR_PDMD | CNTR_INTEN;
240
241         error = scsi_add_host(instance, NULL);
242         if (error)
243                 goto fail_host;
244
245         platform_set_drvdata(pdev, instance);
246
247         scsi_scan_host(instance);
248         return 0;
249
250 fail_host:
251         free_irq(IRQ_AMIGA_PORTS, instance);
252 fail_irq:
253         scsi_host_put(instance);
254 fail_alloc:
255         release_mem_region(res->start, resource_size(res));
256         return error;
257 }
258
259 static int __exit amiga_a3000_scsi_remove(struct platform_device *pdev)
260 {
261         struct Scsi_Host *instance = platform_get_drvdata(pdev);
262         struct a3000_hostdata *hdata = shost_priv(instance);
263         struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
264
265         hdata->regs->CNTR = 0;
266         scsi_remove_host(instance);
267         free_irq(IRQ_AMIGA_PORTS, instance);
268         scsi_host_put(instance);
269         release_mem_region(res->start, resource_size(res));
270         return 0;
271 }
272
273 static struct platform_driver amiga_a3000_scsi_driver = {
274         .remove = __exit_p(amiga_a3000_scsi_remove),
275         .driver   = {
276                 .name   = "amiga-a3000-scsi",
277                 .owner  = THIS_MODULE,
278         },
279 };
280
281 static int __init amiga_a3000_scsi_init(void)
282 {
283         return platform_driver_probe(&amiga_a3000_scsi_driver,
284                                      amiga_a3000_scsi_probe);
285 }
286 module_init(amiga_a3000_scsi_init);
287
288 static void __exit amiga_a3000_scsi_exit(void)
289 {
290         platform_driver_unregister(&amiga_a3000_scsi_driver);
291 }
292 module_exit(amiga_a3000_scsi_exit);
293
294 MODULE_DESCRIPTION("Amiga 3000 built-in SCSI");
295 MODULE_LICENSE("GPL");
296 MODULE_ALIAS("platform:amiga-a3000-scsi");