[SCSI] wd33c93: Kill empty wd33c93_release()
[linux-2.6.git] / drivers / scsi / gvp11.c
1 #include <linux/types.h>
2 #include <linux/mm.h>
3 #include <linux/slab.h>
4 #include <linux/blkdev.h>
5 #include <linux/init.h>
6 #include <linux/interrupt.h>
7
8 #include <asm/setup.h>
9 #include <asm/page.h>
10 #include <asm/pgtable.h>
11 #include <asm/amigaints.h>
12 #include <asm/amigahw.h>
13 #include <linux/zorro.h>
14 #include <asm/irq.h>
15 #include <linux/spinlock.h>
16
17 #include "scsi.h"
18 #include <scsi/scsi_host.h>
19 #include "wd33c93.h"
20 #include "gvp11.h"
21
22 #include<linux/stat.h>
23
24 #define DMA(ptr) ((gvp11_scsiregs *)((ptr)->base))
25 #define HDATA(ptr) ((struct WD33C93_hostdata *)((ptr)->hostdata))
26
27 static irqreturn_t gvp11_intr (int irq, void *_instance)
28 {
29     unsigned long flags;
30     unsigned int status;
31     struct Scsi_Host *instance = (struct Scsi_Host *)_instance;
32
33     status = DMA(instance)->CNTR;
34     if (!(status & GVP11_DMAC_INT_PENDING))
35         return IRQ_NONE;
36
37     spin_lock_irqsave(instance->host_lock, flags);
38     wd33c93_intr(instance);
39     spin_unlock_irqrestore(instance->host_lock, flags);
40     return IRQ_HANDLED;
41 }
42
43 static int gvp11_xfer_mask = 0;
44
45 void gvp11_setup (char *str, int *ints)
46 {
47     gvp11_xfer_mask = ints[1];
48 }
49
50 static int dma_setup(struct scsi_cmnd *cmd, int dir_in)
51 {
52     unsigned short cntr = GVP11_DMAC_INT_ENABLE;
53     unsigned long addr = virt_to_bus(cmd->SCp.ptr);
54     int bank_mask;
55     static int scsi_alloc_out_of_range = 0;
56
57     /* use bounce buffer if the physical address is bad */
58     if (addr & HDATA(cmd->device->host)->dma_xfer_mask)
59     {
60         HDATA(cmd->device->host)->dma_bounce_len = (cmd->SCp.this_residual + 511)
61             & ~0x1ff;
62
63         if( !scsi_alloc_out_of_range ) {
64             HDATA(cmd->device->host)->dma_bounce_buffer =
65                 kmalloc (HDATA(cmd->device->host)->dma_bounce_len, GFP_KERNEL);
66             HDATA(cmd->device->host)->dma_buffer_pool = BUF_SCSI_ALLOCED;
67         }
68
69         if (scsi_alloc_out_of_range ||
70             !HDATA(cmd->device->host)->dma_bounce_buffer) {
71             HDATA(cmd->device->host)->dma_bounce_buffer =
72                 amiga_chip_alloc(HDATA(cmd->device->host)->dma_bounce_len,
73                                        "GVP II SCSI Bounce Buffer");
74
75             if(!HDATA(cmd->device->host)->dma_bounce_buffer)
76             {
77                 HDATA(cmd->device->host)->dma_bounce_len = 0;
78                 return 1;
79             }
80
81             HDATA(cmd->device->host)->dma_buffer_pool = BUF_CHIP_ALLOCED;
82         }
83
84         /* check if the address of the bounce buffer is OK */
85         addr = virt_to_bus(HDATA(cmd->device->host)->dma_bounce_buffer);
86
87         if (addr & HDATA(cmd->device->host)->dma_xfer_mask) {
88             /* fall back to Chip RAM if address out of range */
89             if( HDATA(cmd->device->host)->dma_buffer_pool == BUF_SCSI_ALLOCED) {
90                 kfree (HDATA(cmd->device->host)->dma_bounce_buffer);
91                 scsi_alloc_out_of_range = 1;
92             } else {
93                 amiga_chip_free (HDATA(cmd->device->host)->dma_bounce_buffer);
94             }
95                 
96             HDATA(cmd->device->host)->dma_bounce_buffer =
97                 amiga_chip_alloc(HDATA(cmd->device->host)->dma_bounce_len,
98                                        "GVP II SCSI Bounce Buffer");
99
100             if(!HDATA(cmd->device->host)->dma_bounce_buffer)
101             {
102                 HDATA(cmd->device->host)->dma_bounce_len = 0;
103                 return 1;
104             }
105
106             addr = virt_to_bus(HDATA(cmd->device->host)->dma_bounce_buffer);
107             HDATA(cmd->device->host)->dma_buffer_pool = BUF_CHIP_ALLOCED;
108         }
109             
110         if (!dir_in) {
111             /* copy to bounce buffer for a write */
112             memcpy (HDATA(cmd->device->host)->dma_bounce_buffer,
113                     cmd->SCp.ptr, cmd->SCp.this_residual);
114         }
115     }
116
117     /* setup dma direction */
118     if (!dir_in)
119         cntr |= GVP11_DMAC_DIR_WRITE;
120
121     HDATA(cmd->device->host)->dma_dir = dir_in;
122     DMA(cmd->device->host)->CNTR = cntr;
123
124     /* setup DMA *physical* address */
125     DMA(cmd->device->host)->ACR = addr;
126
127     if (dir_in)
128         /* invalidate any cache */
129         cache_clear (addr, cmd->SCp.this_residual);
130     else
131         /* push any dirty cache */
132         cache_push (addr, cmd->SCp.this_residual);
133
134     if ((bank_mask = (~HDATA(cmd->device->host)->dma_xfer_mask >> 18) & 0x01c0))
135             DMA(cmd->device->host)->BANK = bank_mask & (addr >> 18);
136
137     /* start DMA */
138     DMA(cmd->device->host)->ST_DMA = 1;
139
140     /* return success */
141     return 0;
142 }
143
144 static void dma_stop(struct Scsi_Host *instance, struct scsi_cmnd *SCpnt,
145                      int status)
146 {
147     /* stop DMA */
148     DMA(instance)->SP_DMA = 1;
149     /* remove write bit from CONTROL bits */
150     DMA(instance)->CNTR = GVP11_DMAC_INT_ENABLE;
151
152     /* copy from a bounce buffer, if necessary */
153     if (status && HDATA(instance)->dma_bounce_buffer) {
154         if (HDATA(instance)->dma_dir && SCpnt)
155             memcpy (SCpnt->SCp.ptr, 
156                     HDATA(instance)->dma_bounce_buffer,
157                     SCpnt->SCp.this_residual);
158         
159         if (HDATA(instance)->dma_buffer_pool == BUF_SCSI_ALLOCED)
160             kfree (HDATA(instance)->dma_bounce_buffer);
161         else
162             amiga_chip_free(HDATA(instance)->dma_bounce_buffer);
163         
164         HDATA(instance)->dma_bounce_buffer = NULL;
165         HDATA(instance)->dma_bounce_len = 0;
166     }
167 }
168
169 #define CHECK_WD33C93
170
171 int __init gvp11_detect(struct scsi_host_template *tpnt)
172 {
173     static unsigned char called = 0;
174     struct Scsi_Host *instance;
175     unsigned long address;
176     unsigned int epc;
177     struct zorro_dev *z = NULL;
178     unsigned int default_dma_xfer_mask;
179     wd33c93_regs regs;
180     int num_gvp11 = 0;
181 #ifdef CHECK_WD33C93
182     volatile unsigned char *sasr_3393, *scmd_3393;
183     unsigned char save_sasr;
184     unsigned char q, qq;
185 #endif
186
187     if (!MACH_IS_AMIGA || called)
188         return 0;
189     called = 1;
190
191     tpnt->proc_name = "GVP11";
192     tpnt->proc_info = &wd33c93_proc_info;
193
194     while ((z = zorro_find_device(ZORRO_WILDCARD, z))) {
195         /* 
196          * This should (hopefully) be the correct way to identify
197          * all the different GVP SCSI controllers (except for the
198          * SERIES I though).
199          */
200
201         if (z->id == ZORRO_PROD_GVP_COMBO_030_R3_SCSI ||
202             z->id == ZORRO_PROD_GVP_SERIES_II)
203             default_dma_xfer_mask = ~0x00ffffff;
204         else if (z->id == ZORRO_PROD_GVP_GFORCE_030_SCSI ||
205                  z->id == ZORRO_PROD_GVP_A530_SCSI ||
206                  z->id == ZORRO_PROD_GVP_COMBO_030_R4_SCSI)
207             default_dma_xfer_mask = ~0x01ffffff;
208         else if (z->id == ZORRO_PROD_GVP_A1291 ||
209                  z->id == ZORRO_PROD_GVP_GFORCE_040_SCSI_1)
210             default_dma_xfer_mask = ~0x07ffffff;
211         else
212             continue;
213
214         /*
215          * Rumors state that some GVP ram boards use the same product
216          * code as the SCSI controllers. Therefore if the board-size
217          * is not 64KB we asume it is a ram board and bail out.
218          */
219         if (z->resource.end-z->resource.start != 0xffff)
220                 continue;
221
222         address = z->resource.start;
223         if (!request_mem_region(address, 256, "wd33c93"))
224             continue;
225
226 #ifdef CHECK_WD33C93
227
228         /*
229          * These darn GVP boards are a problem - it can be tough to tell
230          * whether or not they include a SCSI controller. This is the
231          * ultimate Yet-Another-GVP-Detection-Hack in that it actually
232          * probes for a WD33c93 chip: If we find one, it's extremely
233          * likely that this card supports SCSI, regardless of Product_
234          * Code, Board_Size, etc. 
235          */
236
237     /* Get pointers to the presumed register locations and save contents */
238
239         sasr_3393 = &(((gvp11_scsiregs *)(ZTWO_VADDR(address)))->SASR);
240         scmd_3393 = &(((gvp11_scsiregs *)(ZTWO_VADDR(address)))->SCMD);
241         save_sasr = *sasr_3393;
242
243     /* First test the AuxStatus Reg */
244
245         q = *sasr_3393;         /* read it */
246         if (q & 0x08)           /* bit 3 should always be clear */
247                 goto release;
248         *sasr_3393 = WD_AUXILIARY_STATUS;        /* setup indirect address */
249         if (*sasr_3393 == WD_AUXILIARY_STATUS) { /* shouldn't retain the write */
250                 *sasr_3393 = save_sasr; /* Oops - restore this byte */
251                 goto release;
252                 }
253         if (*sasr_3393 != q) {  /* should still read the same */
254                 *sasr_3393 = save_sasr; /* Oops - restore this byte */
255                 goto release;
256                 }
257         if (*scmd_3393 != q)    /* and so should the image at 0x1f */
258                 goto release;
259
260
261     /* Ok, we probably have a wd33c93, but let's check a few other places
262      * for good measure. Make sure that this works for both 'A and 'B    
263      * chip versions.
264      */
265
266         *sasr_3393 = WD_SCSI_STATUS;
267         q = *scmd_3393;
268         *sasr_3393 = WD_SCSI_STATUS;
269         *scmd_3393 = ~q;
270         *sasr_3393 = WD_SCSI_STATUS;
271         qq = *scmd_3393;
272         *sasr_3393 = WD_SCSI_STATUS;
273         *scmd_3393 = q;
274         if (qq != q)                    /* should be read only */
275                 goto release;
276         *sasr_3393 = 0x1e;      /* this register is unimplemented */
277         q = *scmd_3393;
278         *sasr_3393 = 0x1e;
279         *scmd_3393 = ~q;
280         *sasr_3393 = 0x1e;
281         qq = *scmd_3393;
282         *sasr_3393 = 0x1e;
283         *scmd_3393 = q;
284         if (qq != q || qq != 0xff)      /* should be read only, all 1's */
285                 goto release;
286         *sasr_3393 = WD_TIMEOUT_PERIOD;
287         q = *scmd_3393;
288         *sasr_3393 = WD_TIMEOUT_PERIOD;
289         *scmd_3393 = ~q;
290         *sasr_3393 = WD_TIMEOUT_PERIOD;
291         qq = *scmd_3393;
292         *sasr_3393 = WD_TIMEOUT_PERIOD;
293         *scmd_3393 = q;
294         if (qq != (~q & 0xff))          /* should be read/write */
295                 goto release;
296 #endif
297
298         instance = scsi_register (tpnt, sizeof (struct WD33C93_hostdata));
299         if(instance == NULL)
300                 goto release;
301         instance->base = ZTWO_VADDR(address);
302         instance->irq = IRQ_AMIGA_PORTS;
303         instance->unique_id = z->slotaddr;
304
305         if (gvp11_xfer_mask)
306                 HDATA(instance)->dma_xfer_mask = gvp11_xfer_mask;
307         else
308                 HDATA(instance)->dma_xfer_mask = default_dma_xfer_mask;
309
310
311         DMA(instance)->secret2 = 1;
312         DMA(instance)->secret1 = 0;
313         DMA(instance)->secret3 = 15;
314         while (DMA(instance)->CNTR & GVP11_DMAC_BUSY) ;
315         DMA(instance)->CNTR = 0;
316
317         DMA(instance)->BANK = 0;
318
319         epc = *(unsigned short *)(ZTWO_VADDR(address) + 0x8000);
320
321         /*
322          * Check for 14MHz SCSI clock
323          */
324         regs.SASR = &(DMA(instance)->SASR);
325         regs.SCMD = &(DMA(instance)->SCMD);
326         HDATA(instance)->no_sync = 0xff;
327         HDATA(instance)->fast = 0;
328         HDATA(instance)->dma_mode = CTRL_DMA;
329         wd33c93_init(instance, regs, dma_setup, dma_stop,
330                      (epc & GVP_SCSICLKMASK) ? WD33C93_FS_8_10
331                                              : WD33C93_FS_12_15);
332
333         if (request_irq(IRQ_AMIGA_PORTS, gvp11_intr, IRQF_SHARED, "GVP11 SCSI",
334                         instance))
335                 goto unregister;
336         DMA(instance)->CNTR = GVP11_DMAC_INT_ENABLE;
337         num_gvp11++;
338         continue;
339
340 unregister:
341         scsi_unregister(instance);
342 release:
343         release_mem_region(address, 256);
344     }
345
346     return num_gvp11;
347 }
348
349 static int gvp11_bus_reset(struct scsi_cmnd *cmd)
350 {
351         /* FIXME perform bus-specific reset */
352
353         /* FIXME 2: shouldn't we no-op this function (return
354            FAILED), and fall back to host reset function,
355            wd33c93_host_reset ? */
356
357         spin_lock_irq(cmd->device->host->host_lock);
358         wd33c93_host_reset(cmd);
359         spin_unlock_irq(cmd->device->host->host_lock);
360
361         return SUCCESS;
362 }
363
364
365 #define HOSTS_C
366
367 #include "gvp11.h"
368
369 static struct scsi_host_template driver_template = {
370         .proc_name              = "GVP11",
371         .name                   = "GVP Series II SCSI",
372         .detect                 = gvp11_detect,
373         .release                = gvp11_release,
374         .queuecommand           = wd33c93_queuecommand,
375         .eh_abort_handler       = wd33c93_abort,
376         .eh_bus_reset_handler   = gvp11_bus_reset,
377         .eh_host_reset_handler  = wd33c93_host_reset,
378         .can_queue              = CAN_QUEUE,
379         .this_id                = 7,
380         .sg_tablesize           = SG_ALL,
381         .cmd_per_lun            = CMD_PER_LUN,
382         .use_clustering         = DISABLE_CLUSTERING
383 };
384
385
386 #include "scsi_module.c"
387
388 int gvp11_release(struct Scsi_Host *instance)
389 {
390 #ifdef MODULE
391     DMA(instance)->CNTR = 0;
392     release_mem_region(ZTWO_PADDR(instance->base), 256);
393     free_irq(IRQ_AMIGA_PORTS, instance);
394 #endif
395     return 1;
396 }
397
398 MODULE_LICENSE("GPL");