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 }
574
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