Merge branch 'for-linus' of master.kernel.org:/pub/scm/linux/kernel/git/shaggy/jfs-2.6
[linux-2.6] / drivers / scsi / dec_esp.c
1 /*
2  * dec_esp.c: Driver for SCSI chips on IOASIC based TURBOchannel DECstations
3  *            and TURBOchannel PMAZ-A cards
4  *
5  * TURBOchannel changes by Harald Koerfgen
6  * PMAZ-A support by David Airlie
7  *
8  * based on jazz_esp.c:
9  * Copyright (C) 1997 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
10  *
11  * jazz_esp is based on David S. Miller's ESP driver and cyber_esp
12  *
13  * 20000819 - Small PMAZ-AA fixes by Florian Lohoff <flo@rfc822.org>
14  *            Be warned the PMAZ-AA works currently as a single card.
15  *            Dont try to put multiple cards in one machine - They are
16  *            both detected but it may crash under high load garbling your
17  *            data.
18  * 20001005     - Initialization fixes for 2.4.0-test9
19  *                        Florian Lohoff <flo@rfc822.org>
20  *
21  *      Copyright (C) 2002, 2003  Maciej W. Rozycki
22  */
23
24 #include <linux/kernel.h>
25 #include <linux/delay.h>
26 #include <linux/types.h>
27 #include <linux/string.h>
28 #include <linux/slab.h>
29 #include <linux/blkdev.h>
30 #include <linux/proc_fs.h>
31 #include <linux/spinlock.h>
32 #include <linux/stat.h>
33
34 #include <asm/dma.h>
35 #include <asm/irq.h>
36 #include <asm/pgtable.h>
37 #include <asm/system.h>
38
39 #include <asm/dec/interrupts.h>
40 #include <asm/dec/ioasic.h>
41 #include <asm/dec/ioasic_addrs.h>
42 #include <asm/dec/ioasic_ints.h>
43 #include <asm/dec/machtype.h>
44 #include <asm/dec/tc.h>
45
46 #define DEC_SCSI_SREG 0
47 #define DEC_SCSI_DMAREG 0x40000
48 #define DEC_SCSI_SRAM 0x80000
49 #define DEC_SCSI_DIAG 0xC0000
50
51 #include "scsi.h"
52 #include <scsi/scsi_host.h>
53 #include "NCR53C9x.h"
54
55 static int  dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
56 static void dma_drain(struct NCR_ESP *esp);
57 static int  dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd *sp);
58 static void dma_dump_state(struct NCR_ESP *esp);
59 static void dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length);
60 static void dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length);
61 static void dma_ints_off(struct NCR_ESP *esp);
62 static void dma_ints_on(struct NCR_ESP *esp);
63 static int  dma_irq_p(struct NCR_ESP *esp);
64 static int  dma_ports_p(struct NCR_ESP *esp);
65 static void dma_setup(struct NCR_ESP *esp, u32 addr, int count, int write);
66 static void dma_mmu_get_scsi_one(struct NCR_ESP *esp, struct scsi_cmnd * sp);
67 static void dma_mmu_get_scsi_sgl(struct NCR_ESP *esp, struct scsi_cmnd * sp);
68 static void dma_advance_sg(struct scsi_cmnd * sp);
69
70 static void pmaz_dma_drain(struct NCR_ESP *esp);
71 static void pmaz_dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length);
72 static void pmaz_dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length);
73 static void pmaz_dma_ints_off(struct NCR_ESP *esp);
74 static void pmaz_dma_ints_on(struct NCR_ESP *esp);
75 static void pmaz_dma_setup(struct NCR_ESP *esp, u32 addr, int count, int write);
76 static void pmaz_dma_mmu_get_scsi_one(struct NCR_ESP *esp, struct scsi_cmnd * sp);
77
78 #define TC_ESP_RAM_SIZE 0x20000
79 #define ESP_TGT_DMA_SIZE ((TC_ESP_RAM_SIZE/7) & ~(sizeof(int)-1))
80 #define ESP_NCMD 7
81
82 #define TC_ESP_DMAR_MASK  0x1ffff
83 #define TC_ESP_DMAR_WRITE 0x80000000
84 #define TC_ESP_DMA_ADDR(x) ((unsigned)(x) & TC_ESP_DMAR_MASK)
85
86 u32 esp_virt_buffer;
87 int scsi_current_length;
88
89 volatile unsigned char cmd_buffer[16];
90 volatile unsigned char pmaz_cmd_buffer[16];
91                                 /* This is where all commands are put
92                                  * before they are trasfered to the ESP chip
93                                  * via PIO.
94                                  */
95
96 static irqreturn_t scsi_dma_merr_int(int, void *, struct pt_regs *);
97 static irqreturn_t scsi_dma_err_int(int, void *, struct pt_regs *);
98 static irqreturn_t scsi_dma_int(int, void *, struct pt_regs *);
99
100 static int dec_esp_detect(struct scsi_host_template * tpnt);
101
102 static int dec_esp_release(struct Scsi_Host *shost)
103 {
104         if (shost->irq)
105                 free_irq(shost->irq, NULL);
106         if (shost->io_port && shost->n_io_port)
107                 release_region(shost->io_port, shost->n_io_port);
108         scsi_unregister(shost);
109         return 0;
110 }
111
112 static struct scsi_host_template driver_template = {
113         .proc_name              = "dec_esp",
114         .proc_info              = esp_proc_info,
115         .name                   = "NCR53C94",
116         .detect                 = dec_esp_detect,
117         .slave_alloc            = esp_slave_alloc,
118         .slave_destroy          = esp_slave_destroy,
119         .release                = dec_esp_release,
120         .info                   = esp_info,
121         .queuecommand           = esp_queue,
122         .eh_abort_handler       = esp_abort,
123         .eh_bus_reset_handler   = esp_reset,
124         .can_queue              = 7,
125         .this_id                = 7,
126         .sg_tablesize           = SG_ALL,
127         .cmd_per_lun            = 1,
128         .use_clustering         = DISABLE_CLUSTERING,
129 };
130
131
132 #include "scsi_module.c"
133
134 /***************************************************************** Detection */
135 static int dec_esp_detect(Scsi_Host_Template * tpnt)
136 {
137         struct NCR_ESP *esp;
138         struct ConfigDev *esp_dev;
139         int slot;
140         unsigned long mem_start;
141
142         if (IOASIC) {
143                 esp_dev = 0;
144                 esp = esp_allocate(tpnt, (void *) esp_dev);
145
146                 /* Do command transfer with programmed I/O */
147                 esp->do_pio_cmds = 1;
148
149                 /* Required functions */
150                 esp->dma_bytes_sent = &dma_bytes_sent;
151                 esp->dma_can_transfer = &dma_can_transfer;
152                 esp->dma_dump_state = &dma_dump_state;
153                 esp->dma_init_read = &dma_init_read;
154                 esp->dma_init_write = &dma_init_write;
155                 esp->dma_ints_off = &dma_ints_off;
156                 esp->dma_ints_on = &dma_ints_on;
157                 esp->dma_irq_p = &dma_irq_p;
158                 esp->dma_ports_p = &dma_ports_p;
159                 esp->dma_setup = &dma_setup;
160
161                 /* Optional functions */
162                 esp->dma_barrier = 0;
163                 esp->dma_drain = &dma_drain;
164                 esp->dma_invalidate = 0;
165                 esp->dma_irq_entry = 0;
166                 esp->dma_irq_exit = 0;
167                 esp->dma_poll = 0;
168                 esp->dma_reset = 0;
169                 esp->dma_led_off = 0;
170                 esp->dma_led_on = 0;
171
172                 /* virtual DMA functions */
173                 esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one;
174                 esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl;
175                 esp->dma_mmu_release_scsi_one = 0;
176                 esp->dma_mmu_release_scsi_sgl = 0;
177                 esp->dma_advance_sg = &dma_advance_sg;
178
179
180                 /* SCSI chip speed */
181                 esp->cfreq = 25000000;
182
183                 esp->dregs = 0;
184
185                 /* ESP register base */
186                 esp->eregs = (struct ESP_regs *) (system_base + IOASIC_SCSI);
187
188                 /* Set the command buffer */
189                 esp->esp_command = (volatile unsigned char *) cmd_buffer;
190
191                 /* get virtual dma address for command buffer */
192                 esp->esp_command_dvma = virt_to_phys(cmd_buffer);
193
194                 esp->irq = dec_interrupt[DEC_IRQ_ASC];
195
196                 esp->scsi_id = 7;
197
198                 /* Check for differential SCSI-bus */
199                 esp->diff = 0;
200
201                 esp_initialize(esp);
202
203                 if (request_irq(esp->irq, esp_intr, SA_INTERRUPT,
204                                 "ncr53c94", esp->ehost))
205                         goto err_dealloc;
206                 if (request_irq(dec_interrupt[DEC_IRQ_ASC_MERR],
207                                 scsi_dma_merr_int, SA_INTERRUPT,
208                                 "ncr53c94 error", esp->ehost))
209                         goto err_free_irq;
210                 if (request_irq(dec_interrupt[DEC_IRQ_ASC_ERR],
211                                 scsi_dma_err_int, SA_INTERRUPT,
212                                 "ncr53c94 overrun", esp->ehost))
213                         goto err_free_irq_merr;
214                 if (request_irq(dec_interrupt[DEC_IRQ_ASC_DMA],
215                                 scsi_dma_int, SA_INTERRUPT,
216                                 "ncr53c94 dma", esp->ehost))
217                         goto err_free_irq_err;
218
219         }
220
221         if (TURBOCHANNEL) {
222                 while ((slot = search_tc_card("PMAZ-AA")) >= 0) {
223                         claim_tc_card(slot);
224
225                         esp_dev = 0;
226                         esp = esp_allocate(tpnt, (void *) esp_dev);
227
228                         mem_start = get_tc_base_addr(slot);
229
230                         /* Store base addr into esp struct */
231                         esp->slot = PHYSADDR(mem_start);
232
233                         esp->dregs = 0;
234                         esp->eregs = (struct ESP_regs *) (mem_start + DEC_SCSI_SREG);
235                         esp->do_pio_cmds = 1;
236
237                         /* Set the command buffer */
238                         esp->esp_command = (volatile unsigned char *) pmaz_cmd_buffer;
239
240                         /* get virtual dma address for command buffer */
241                         esp->esp_command_dvma = virt_to_phys(pmaz_cmd_buffer);
242
243                         esp->cfreq = get_tc_speed();
244
245                         esp->irq = get_tc_irq_nr(slot);
246
247                         /* Required functions */
248                         esp->dma_bytes_sent = &dma_bytes_sent;
249                         esp->dma_can_transfer = &dma_can_transfer;
250                         esp->dma_dump_state = &dma_dump_state;
251                         esp->dma_init_read = &pmaz_dma_init_read;
252                         esp->dma_init_write = &pmaz_dma_init_write;
253                         esp->dma_ints_off = &pmaz_dma_ints_off;
254                         esp->dma_ints_on = &pmaz_dma_ints_on;
255                         esp->dma_irq_p = &dma_irq_p;
256                         esp->dma_ports_p = &dma_ports_p;
257                         esp->dma_setup = &pmaz_dma_setup;
258
259                         /* Optional functions */
260                         esp->dma_barrier = 0;
261                         esp->dma_drain = &pmaz_dma_drain;
262                         esp->dma_invalidate = 0;
263                         esp->dma_irq_entry = 0;
264                         esp->dma_irq_exit = 0;
265                         esp->dma_poll = 0;
266                         esp->dma_reset = 0;
267                         esp->dma_led_off = 0;
268                         esp->dma_led_on = 0;
269
270                         esp->dma_mmu_get_scsi_one = pmaz_dma_mmu_get_scsi_one;
271                         esp->dma_mmu_get_scsi_sgl = 0;
272                         esp->dma_mmu_release_scsi_one = 0;
273                         esp->dma_mmu_release_scsi_sgl = 0;
274                         esp->dma_advance_sg = 0;
275
276                         if (request_irq(esp->irq, esp_intr, SA_INTERRUPT,
277                                          "PMAZ_AA", esp->ehost)) {
278                                 esp_deallocate(esp);
279                                 release_tc_card(slot);
280                                 continue;
281                         }
282                         esp->scsi_id = 7;
283                         esp->diff = 0;
284                         esp_initialize(esp);
285                 }
286         }
287
288         if(nesps) {
289                 printk("ESP: Total of %d ESP hosts found, %d actually in use.\n", nesps, esps_in_use);
290                 esps_running = esps_in_use;
291                 return esps_in_use;
292         }
293         return 0;
294
295 err_free_irq_err:
296         free_irq(dec_interrupt[DEC_IRQ_ASC_ERR], scsi_dma_err_int);
297 err_free_irq_merr:
298         free_irq(dec_interrupt[DEC_IRQ_ASC_MERR], scsi_dma_merr_int);
299 err_free_irq:
300         free_irq(esp->irq, esp_intr);
301 err_dealloc:
302         esp_deallocate(esp);
303         return 0;
304 }
305
306 /************************************************************* DMA Functions */
307 static irqreturn_t scsi_dma_merr_int(int irq, void *dev_id, struct pt_regs *regs)
308 {
309         printk("Got unexpected SCSI DMA Interrupt! < ");
310         printk("SCSI_DMA_MEMRDERR ");
311         printk(">\n");
312
313         return IRQ_HANDLED;
314 }
315
316 static irqreturn_t scsi_dma_err_int(int irq, void *dev_id, struct pt_regs *regs)
317 {
318         /* empty */
319
320         return IRQ_HANDLED;
321 }
322
323 static irqreturn_t scsi_dma_int(int irq, void *dev_id, struct pt_regs *regs)
324 {
325         u32 scsi_next_ptr;
326
327         scsi_next_ptr = ioasic_read(IO_REG_SCSI_DMA_P);
328
329         /* next page */
330         scsi_next_ptr = (((scsi_next_ptr >> 3) + PAGE_SIZE) & PAGE_MASK) << 3;
331         ioasic_write(IO_REG_SCSI_DMA_BP, scsi_next_ptr);
332         fast_iob();
333
334         return IRQ_HANDLED;
335 }
336
337 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
338 {
339         return fifo_count;
340 }
341
342 static void dma_drain(struct NCR_ESP *esp)
343 {
344         u32 nw, data0, data1, scsi_data_ptr;
345         u16 *p;
346
347         nw = ioasic_read(IO_REG_SCSI_SCR);
348
349         /*
350          * Is there something in the dma buffers left?
351          */
352         if (nw) {
353                 scsi_data_ptr = ioasic_read(IO_REG_SCSI_DMA_P) >> 3;
354                 p = phys_to_virt(scsi_data_ptr);
355                 switch (nw) {
356                 case 1:
357                         data0 = ioasic_read(IO_REG_SCSI_SDR0);
358                         p[0] = data0 & 0xffff;
359                         break;
360                 case 2:
361                         data0 = ioasic_read(IO_REG_SCSI_SDR0);
362                         p[0] = data0 & 0xffff;
363                         p[1] = (data0 >> 16) & 0xffff;
364                         break;
365                 case 3:
366                         data0 = ioasic_read(IO_REG_SCSI_SDR0);
367                         data1 = ioasic_read(IO_REG_SCSI_SDR1);
368                         p[0] = data0 & 0xffff;
369                         p[1] = (data0 >> 16) & 0xffff;
370                         p[2] = data1 & 0xffff;
371                         break;
372                 default:
373                         printk("Strange: %d words in dma buffer left\n", nw);
374                         break;
375                 }
376         }
377 }
378
379 static int dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd * sp)
380 {
381         return sp->SCp.this_residual;
382 }
383
384 static void dma_dump_state(struct NCR_ESP *esp)
385 {
386 }
387
388 static void dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length)
389 {
390         u32 scsi_next_ptr, ioasic_ssr;
391         unsigned long flags;
392
393         if (vaddress & 3)
394                 panic("dec_esp.c: unable to handle partial word transfers, yet...");
395
396         dma_cache_wback_inv((unsigned long) phys_to_virt(vaddress), length);
397
398         spin_lock_irqsave(&ioasic_ssr_lock, flags);
399
400         fast_mb();
401         ioasic_ssr = ioasic_read(IO_REG_SSR);
402
403         ioasic_ssr &= ~IO_SSR_SCSI_DMA_EN;
404         ioasic_write(IO_REG_SSR, ioasic_ssr);
405
406         fast_wmb();
407         ioasic_write(IO_REG_SCSI_SCR, 0);
408         ioasic_write(IO_REG_SCSI_DMA_P, vaddress << 3);
409
410         /* prepare for next page */
411         scsi_next_ptr = ((vaddress + PAGE_SIZE) & PAGE_MASK) << 3;
412         ioasic_write(IO_REG_SCSI_DMA_BP, scsi_next_ptr);
413
414         ioasic_ssr |= (IO_SSR_SCSI_DMA_DIR | IO_SSR_SCSI_DMA_EN);
415         fast_wmb();
416         ioasic_write(IO_REG_SSR, ioasic_ssr);
417
418         fast_iob();
419         spin_unlock_irqrestore(&ioasic_ssr_lock, flags);
420 }
421
422 static void dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length)
423 {
424         u32 scsi_next_ptr, ioasic_ssr;
425         unsigned long flags;
426
427         if (vaddress & 3)
428                 panic("dec_esp.c: unable to handle partial word transfers, yet...");
429
430         dma_cache_wback_inv((unsigned long) phys_to_virt(vaddress), length);
431
432         spin_lock_irqsave(&ioasic_ssr_lock, flags);
433
434         fast_mb();
435         ioasic_ssr = ioasic_read(IO_REG_SSR);
436
437         ioasic_ssr &= ~(IO_SSR_SCSI_DMA_DIR | IO_SSR_SCSI_DMA_EN);
438         ioasic_write(IO_REG_SSR, ioasic_ssr);
439
440         fast_wmb();
441         ioasic_write(IO_REG_SCSI_SCR, 0);
442         ioasic_write(IO_REG_SCSI_DMA_P, vaddress << 3);
443
444         /* prepare for next page */
445         scsi_next_ptr = ((vaddress + PAGE_SIZE) & PAGE_MASK) << 3;
446         ioasic_write(IO_REG_SCSI_DMA_BP, scsi_next_ptr);
447
448         ioasic_ssr |= IO_SSR_SCSI_DMA_EN;
449         fast_wmb();
450         ioasic_write(IO_REG_SSR, ioasic_ssr);
451
452         fast_iob();
453         spin_unlock_irqrestore(&ioasic_ssr_lock, flags);
454 }
455
456 static void dma_ints_off(struct NCR_ESP *esp)
457 {
458         disable_irq(dec_interrupt[DEC_IRQ_ASC_DMA]);
459 }
460
461 static void dma_ints_on(struct NCR_ESP *esp)
462 {
463         enable_irq(dec_interrupt[DEC_IRQ_ASC_DMA]);
464 }
465
466 static int dma_irq_p(struct NCR_ESP *esp)
467 {
468         return (esp->eregs->esp_status & ESP_STAT_INTR);
469 }
470
471 static int dma_ports_p(struct NCR_ESP *esp)
472 {
473         /*
474          * FIXME: what's this good for?
475          */
476         return 1;
477 }
478
479 static void dma_setup(struct NCR_ESP *esp, u32 addr, int count, int write)
480 {
481         /*
482          * DMA_ST_WRITE means "move data from device to memory"
483          * so when (write) is true, it actually means READ!
484          */
485         if (write)
486                 dma_init_read(esp, addr, count);
487         else
488                 dma_init_write(esp, addr, count);
489 }
490
491 static void dma_mmu_get_scsi_one(struct NCR_ESP *esp, struct scsi_cmnd * sp)
492 {
493         sp->SCp.ptr = (char *)virt_to_phys(sp->request_buffer);
494 }
495
496 static void dma_mmu_get_scsi_sgl(struct NCR_ESP *esp, struct scsi_cmnd * sp)
497 {
498         int sz = sp->SCp.buffers_residual;
499         struct scatterlist *sg = sp->SCp.buffer;
500
501         while (sz >= 0) {
502                 sg[sz].dma_address = page_to_phys(sg[sz].page) + sg[sz].offset;
503                 sz--;
504         }
505         sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address);
506 }
507
508 static void dma_advance_sg(struct scsi_cmnd * sp)
509 {
510         sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address);
511 }
512
513 static void pmaz_dma_drain(struct NCR_ESP *esp)
514 {
515         memcpy(phys_to_virt(esp_virt_buffer),
516                 (void *)KSEG1ADDR(esp->slot + DEC_SCSI_SRAM + ESP_TGT_DMA_SIZE),
517                 scsi_current_length);
518 }
519
520 static void pmaz_dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length)
521 {
522         volatile u32 *dmareg =
523                 (volatile u32 *)KSEG1ADDR(esp->slot + DEC_SCSI_DMAREG);
524
525         if (length > ESP_TGT_DMA_SIZE)
526                 length = ESP_TGT_DMA_SIZE;
527
528         *dmareg = TC_ESP_DMA_ADDR(ESP_TGT_DMA_SIZE);
529
530         iob();
531
532         esp_virt_buffer = vaddress;
533         scsi_current_length = length;
534 }
535
536 static void pmaz_dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length)
537 {
538         volatile u32 *dmareg =
539                 (volatile u32 *)KSEG1ADDR(esp->slot + DEC_SCSI_DMAREG);
540
541         memcpy((void *)KSEG1ADDR(esp->slot + DEC_SCSI_SRAM + ESP_TGT_DMA_SIZE),
542                phys_to_virt(vaddress), length);
543
544         wmb();
545         *dmareg = TC_ESP_DMAR_WRITE | TC_ESP_DMA_ADDR(ESP_TGT_DMA_SIZE);
546
547         iob();
548 }
549
550 static void pmaz_dma_ints_off(struct NCR_ESP *esp)
551 {
552 }
553
554 static void pmaz_dma_ints_on(struct NCR_ESP *esp)
555 {
556 }
557
558 static void pmaz_dma_setup(struct NCR_ESP *esp, u32 addr, int count, int write)
559 {
560         /*
561          * DMA_ST_WRITE means "move data from device to memory"
562          * so when (write) is true, it actually means READ!
563          */
564         if (write)
565                 pmaz_dma_init_read(esp, addr, count);
566         else
567                 pmaz_dma_init_write(esp, addr, count);
568 }
569
570 static void pmaz_dma_mmu_get_scsi_one(struct NCR_ESP *esp, struct scsi_cmnd * sp)
571 {
572         sp->SCp.ptr = (char *)virt_to_phys(sp->request_buffer);
573 }