blob: a3dd55d1d2fdb3d3a4294707614ef033f9d9831b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001 /*
2 * Sun3 SCSI stuff by Erik Verbruggen (erik@bigmama.xtdnet.nl)
3 *
4 * Sun3 DMA routines added by Sam Creasey (sammy@sammy.net)
5 *
6 * VME support added by Sam Creasey
7 *
8 * Adapted from sun3_scsi.c -- see there for other headers
9 *
10 * TODO: modify this driver to support multiple Sun3 SCSI VME boards
11 *
12 */
13
14#define AUTOSENSE
15
16#include <linux/types.h>
17#include <linux/stddef.h>
18#include <linux/ctype.h>
19#include <linux/delay.h>
20
21#include <linux/module.h>
22#include <linux/signal.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/ioport.h>
24#include <linux/init.h>
25#include <linux/blkdev.h>
26
27#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29#include <asm/sun3ints.h>
30#include <asm/dvma.h>
31#include <asm/idprom.h>
32#include <asm/machines.h>
33
34#define SUN3_SCSI_VME
35
36#undef SUN3_SCSI_DEBUG
37
38/* dma on! */
39#define REAL_DMA
40
Geert Uytterhoeven2ba51ea2011-06-13 20:39:21 +020041#define NDEBUG 0
42
43#define NDEBUG_ABORT 0x00100000
44#define NDEBUG_TAGS 0x00200000
45#define NDEBUG_MERGING 0x00400000
46
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include "scsi.h"
Sam Creaseyc39e7ee2006-12-09 10:37:05 +010048#include "initio.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070049#include <scsi/scsi_host.h>
50#include "sun3_scsi.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52extern int sun3_map_test(unsigned long, char *);
53
54#define USE_WRAPPER
55/*#define RESET_BOOT */
56#define DRIVER_SETUP
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058/*
59 * BUG can be used to trigger a strange code-size related hang on 2.1 kernels
60 */
61#ifdef BUG
62#undef RESET_BOOT
63#undef DRIVER_SETUP
64#endif
65
66/* #define SUPPORT_TAGS */
67
68//#define ENABLE_IRQ() enable_irq( SUN3_VEC_VMESCSI0 );
69#define ENABLE_IRQ()
70
71
David Howells7d12e782006-10-05 14:55:46 +010072static irqreturn_t scsi_sun3_intr(int irq, void *dummy);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073static inline unsigned char sun3scsi_read(int reg);
74static inline void sun3scsi_write(int reg, int value);
75
76static int setup_can_queue = -1;
77module_param(setup_can_queue, int, 0);
78static int setup_cmd_per_lun = -1;
79module_param(setup_cmd_per_lun, int, 0);
80static int setup_sg_tablesize = -1;
81module_param(setup_sg_tablesize, int, 0);
82#ifdef SUPPORT_TAGS
83static int setup_use_tagged_queuing = -1;
84module_param(setup_use_tagged_queuing, int, 0);
85#endif
86static int setup_hostid = -1;
87module_param(setup_hostid, int, 0);
88
Henne811c9362006-10-03 19:51:59 +020089static struct scsi_cmnd *sun3_dma_setup_done = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
91#define AFTER_RESET_DELAY (HZ/2)
92
93/* ms to wait after hitting dma regs */
94#define SUN3_DMA_DELAY 10
95
96/* dvma buffer to allocate -- 32k should hopefully be more than sufficient */
97#define SUN3_DVMA_BUFSIZE 0xe000
98
99/* minimum number of bytes to do dma on */
100#define SUN3_DMA_MINSIZE 128
101
102static volatile unsigned char *sun3_scsi_regp;
103static volatile struct sun3_dma_regs *dregs;
104#ifdef OLDDMA
105static unsigned char *dmabuf = NULL; /* dma memory buffer */
106#endif
107static unsigned char *sun3_dma_orig_addr = NULL;
108static unsigned long sun3_dma_orig_count = 0;
109static int sun3_dma_active = 0;
110static unsigned long last_residual = 0;
111
112/*
113 * NCR 5380 register access functions
114 */
115
116static inline unsigned char sun3scsi_read(int reg)
117{
118 return( sun3_scsi_regp[reg] );
119}
120
121static inline void sun3scsi_write(int reg, int value)
122{
123 sun3_scsi_regp[reg] = value;
124}
125
126/*
127 * XXX: status debug
128 */
129static struct Scsi_Host *default_instance;
130
131/*
Christoph Hellwigd0be4a7d2005-10-31 18:31:40 +0100132 * Function : int sun3scsi_detect(struct scsi_host_template * tpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 *
134 * Purpose : initializes mac NCR5380 driver based on the
135 * command line / compile time port and irq definitions.
136 *
137 * Inputs : tpnt - template for this SCSI adapter.
138 *
139 * Returns : 1 if a host adapter was found, 0 if not.
140 *
141 */
142
Geert Uytterhoevend559c492011-06-13 20:39:18 +0200143static int __init sun3scsi_detect(struct scsi_host_template * tpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144{
145 unsigned long ioaddr, irq = 0;
146 static int called = 0;
147 struct Scsi_Host *instance;
148 int i;
149 unsigned long addrs[3] = { IOBASE_SUN3_VMESCSI,
150 IOBASE_SUN3_VMESCSI + 0x4000,
151 0 };
152 unsigned long vecs[3] = { SUN3_VEC_VMESCSI0,
153 SUN3_VEC_VMESCSI1,
154 0 };
155 /* check that this machine has an onboard 5380 */
156 switch(idprom->id_machtype) {
157 case SM_SUN3|SM_3_160:
158 case SM_SUN3|SM_3_260:
159 break;
160
161 default:
162 return 0;
163 }
164
165 if(called)
166 return 0;
167
168 tpnt->proc_name = "Sun3 5380 VME SCSI";
169
170 /* setup variables */
171 tpnt->can_queue =
172 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
173 tpnt->cmd_per_lun =
174 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
175 tpnt->sg_tablesize =
176 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
177
178 if (setup_hostid >= 0)
179 tpnt->this_id = setup_hostid;
180 else {
181 /* use 7 as default */
182 tpnt->this_id = 7;
183 }
184
185 ioaddr = 0;
186 for(i = 0; addrs[i] != 0; i++) {
187 unsigned char x;
188
189 ioaddr = (unsigned long)sun3_ioremap(addrs[i], PAGE_SIZE,
190 SUN3_PAGE_TYPE_VME16);
191 irq = vecs[i];
192 sun3_scsi_regp = (unsigned char *)ioaddr;
193
194 dregs = (struct sun3_dma_regs *)(((unsigned char *)ioaddr) + 8);
195
196 if(sun3_map_test((unsigned long)dregs, &x)) {
197 unsigned short oldcsr;
198
199 oldcsr = dregs->csr;
200 dregs->csr = 0;
201 udelay(SUN3_DMA_DELAY);
202 if(dregs->csr == 0x1400)
203 break;
204
205 dregs->csr = oldcsr;
206 }
207
208 iounmap((void *)ioaddr);
209 ioaddr = 0;
210 }
211
212 if(!ioaddr)
213 return 0;
214
215#ifdef SUPPORT_TAGS
216 if (setup_use_tagged_queuing < 0)
217 setup_use_tagged_queuing = USE_TAGGED_QUEUING;
218#endif
219
220 instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
221 if(instance == NULL)
222 return 0;
223
224 default_instance = instance;
225
226 instance->io_port = (unsigned long) ioaddr;
227 instance->irq = irq;
228
229 NCR5380_init(instance, 0);
230
231 instance->n_io_port = 32;
232
233 ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
234
235 if (request_irq(instance->irq, scsi_sun3_intr,
Jeff Garzik1e641662007-11-11 19:52:05 -0500236 0, "Sun3SCSI-5380VME", instance)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237#ifndef REAL_DMA
238 printk("scsi%d: IRQ%d not free, interrupts disabled\n",
239 instance->host_no, instance->irq);
240 instance->irq = SCSI_IRQ_NONE;
241#else
242 printk("scsi%d: IRQ%d not free, bailing out\n",
243 instance->host_no, instance->irq);
244 return 0;
245#endif
246 }
247
248 printk("scsi%d: Sun3 5380 VME at port %lX irq", instance->host_no, instance->io_port);
249 if (instance->irq == SCSI_IRQ_NONE)
250 printk ("s disabled");
251 else
252 printk (" %d", instance->irq);
253 printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
254 instance->can_queue, instance->cmd_per_lun,
255 SUN3SCSI_PUBLIC_RELEASE);
256 printk("\nscsi%d:", instance->host_no);
257 NCR5380_print_options(instance);
258 printk("\n");
259
260 dregs->csr = 0;
261 udelay(SUN3_DMA_DELAY);
262 dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR;
263 udelay(SUN3_DMA_DELAY);
264 dregs->fifo_count = 0;
265 dregs->fifo_count_hi = 0;
266 dregs->dma_addr_hi = 0;
267 dregs->dma_addr_lo = 0;
268 dregs->dma_count_hi = 0;
269 dregs->dma_count_lo = 0;
270
271 dregs->ivect = VME_DATA24 | (instance->irq & 0xff);
272
273 called = 1;
274
275#ifdef RESET_BOOT
276 sun3_scsi_reset_boot(instance);
277#endif
278
279 return 1;
280}
281
282int sun3scsi_release (struct Scsi_Host *shpnt)
283{
284 if (shpnt->irq != SCSI_IRQ_NONE)
Jeff Garzik1e641662007-11-11 19:52:05 -0500285 free_irq(shpnt->irq, shpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286
287 iounmap((void *)sun3_scsi_regp);
288
Geert Uytterhoeven19b6c512011-06-13 20:39:19 +0200289 NCR5380_exit(shpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 return 0;
291}
292
293#ifdef RESET_BOOT
294/*
295 * Our 'bus reset on boot' function
296 */
297
298static void sun3_scsi_reset_boot(struct Scsi_Host *instance)
299{
300 unsigned long end;
301
302 NCR5380_local_declare();
303 NCR5380_setup(instance);
304
305 /*
306 * Do a SCSI reset to clean up the bus during initialization. No
307 * messing with the queues, interrupts, or locks necessary here.
308 */
309
310 printk( "Sun3 SCSI: resetting the SCSI bus..." );
311
312 /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
313// sun3_disable_irq( IRQ_SUN3_SCSI );
314
315 /* get in phase */
316 NCR5380_write( TARGET_COMMAND_REG,
317 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
318
319 /* assert RST */
320 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
321
322 /* The min. reset hold time is 25us, so 40us should be enough */
323 udelay( 50 );
324
325 /* reset RST and interrupt */
326 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
327 NCR5380_read( RESET_PARITY_INTERRUPT_REG );
328
329 for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
330 barrier();
331
332 /* switch on SCSI IRQ again */
333// sun3_enable_irq( IRQ_SUN3_SCSI );
334
335 printk( " done\n" );
336}
337#endif
338
339static const char * sun3scsi_info (struct Scsi_Host *spnt) {
340 return "";
341}
342
343// safe bits for the CSR
344#define CSR_GOOD 0x060f
345
David Howells7d12e782006-10-05 14:55:46 +0100346static irqreturn_t scsi_sun3_intr(int irq, void *dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347{
348 unsigned short csr = dregs->csr;
349 int handled = 0;
350
351 dregs->csr &= ~CSR_DMA_ENABLE;
352
353
354#ifdef SUN3_SCSI_DEBUG
355 printk("scsi_intr csr %x\n", csr);
356#endif
357
358 if(csr & ~CSR_GOOD) {
359 if(csr & CSR_DMA_BUSERR) {
360 printk("scsi%d: bus error in dma\n", default_instance->host_no);
361#ifdef SUN3_SCSI_DEBUG
362 printk("scsi: residual %x count %x addr %p dmaaddr %x\n",
363 dregs->fifo_count,
364 dregs->dma_count_lo | (dregs->dma_count_hi << 16),
365 sun3_dma_orig_addr,
366 dregs->dma_addr_lo | (dregs->dma_addr_hi << 16));
367#endif
368 }
369
370 if(csr & CSR_DMA_CONFLICT) {
371 printk("scsi%d: dma conflict\n", default_instance->host_no);
372 }
373 handled = 1;
374 }
375
376 if(csr & (CSR_SDB_INT | CSR_DMA_INT)) {
David Howells7d12e782006-10-05 14:55:46 +0100377 NCR5380_intr(irq, dummy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 handled = 1;
379 }
380
381 return IRQ_RETVAL(handled);
382}
383
384/*
385 * Debug stuff - to be called on NMI, or sysrq key. Use at your own risk;
386 * reentering NCR5380_print_status seems to have ugly side effects
387 */
388
389/* this doesn't seem to get used at all -- sam */
390#if 0
391void sun3_sun3_debug (void)
392{
393 unsigned long flags;
394 NCR5380_local_declare();
395
396 if (default_instance) {
397 local_irq_save(flags);
398 NCR5380_print_status(default_instance);
399 local_irq_restore(flags);
400 }
401}
402#endif
403
404
405/* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */
406static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag)
407{
408 void *addr;
409
410 if(sun3_dma_orig_addr != NULL)
411 dvma_unmap(sun3_dma_orig_addr);
412
413// addr = sun3_dvma_page((unsigned long)data, (unsigned long)dmabuf);
414 addr = (void *)dvma_map_vme((unsigned long) data, count);
415
416 sun3_dma_orig_addr = addr;
417 sun3_dma_orig_count = count;
418
419#ifdef SUN3_SCSI_DEBUG
420 printk("scsi: dma_setup addr %p count %x\n", addr, count);
421#endif
422
423// dregs->fifo_count = 0;
424#if 0
425 /* reset fifo */
426 dregs->csr &= ~CSR_FIFO;
427 dregs->csr |= CSR_FIFO;
428#endif
429 /* set direction */
430 if(write_flag)
431 dregs->csr |= CSR_SEND;
432 else
433 dregs->csr &= ~CSR_SEND;
434
435 /* reset fifo */
436// dregs->csr &= ~CSR_FIFO;
437// dregs->csr |= CSR_FIFO;
438
439 dregs->csr |= CSR_PACK_ENABLE;
440
441 dregs->dma_addr_hi = ((unsigned long)addr >> 16);
442 dregs->dma_addr_lo = ((unsigned long)addr & 0xffff);
443
444 dregs->dma_count_hi = 0;
445 dregs->dma_count_lo = 0;
446 dregs->fifo_count_hi = 0;
447 dregs->fifo_count = 0;
448
449#ifdef SUN3_SCSI_DEBUG
450 printk("scsi: dma_setup done csr %x\n", dregs->csr);
451#endif
452 return count;
453
454}
455
456static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance)
457{
458 return last_residual;
459}
460
Henne811c9362006-10-03 19:51:59 +0200461static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted,
462 struct scsi_cmnd *cmd,
463 int write_flag)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464{
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200465 if (cmd->request->cmd_type == REQ_TYPE_FS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 return wanted;
467 else
468 return 0;
469}
470
471static int sun3scsi_dma_start(unsigned long count, char *data)
472{
473
474 unsigned short csr;
475
476 csr = dregs->csr;
477#ifdef SUN3_SCSI_DEBUG
478 printk("scsi: dma_start data %p count %x csr %x fifo %x\n", data, count, csr, dregs->fifo_count);
479#endif
480
481 dregs->dma_count_hi = (sun3_dma_orig_count >> 16);
482 dregs->dma_count_lo = (sun3_dma_orig_count & 0xffff);
483
484 dregs->fifo_count_hi = (sun3_dma_orig_count >> 16);
485 dregs->fifo_count = (sun3_dma_orig_count & 0xffff);
486
487// if(!(csr & CSR_DMA_ENABLE))
488// dregs->csr |= CSR_DMA_ENABLE;
489
490 return 0;
491}
492
493/* clean up after our dma is done */
494static int sun3scsi_dma_finish(int write_flag)
495{
496 unsigned short fifo;
497 int ret = 0;
498
499 sun3_dma_active = 0;
500
501 dregs->csr &= ~CSR_DMA_ENABLE;
502
503 fifo = dregs->fifo_count;
504 if(write_flag) {
505 if((fifo > 0) && (fifo < sun3_dma_orig_count))
506 fifo++;
507 }
508
509 last_residual = fifo;
510#ifdef SUN3_SCSI_DEBUG
511 printk("scsi: residual %x total %x\n", fifo, sun3_dma_orig_count);
512#endif
513 /* empty bytes from the fifo which didn't make it */
514 if((!write_flag) && (dregs->csr & CSR_LEFT)) {
515 unsigned char *vaddr;
516
517#ifdef SUN3_SCSI_DEBUG
518 printk("scsi: got left over bytes\n");
519#endif
520
521 vaddr = (unsigned char *)dvma_vmetov(sun3_dma_orig_addr);
522
523 vaddr += (sun3_dma_orig_count - fifo);
524 vaddr--;
525
526 switch(dregs->csr & CSR_LEFT) {
527 case CSR_LEFT_3:
528 *vaddr = (dregs->bpack_lo & 0xff00) >> 8;
529 vaddr--;
530
531 case CSR_LEFT_2:
532 *vaddr = (dregs->bpack_hi & 0x00ff);
533 vaddr--;
534
535 case CSR_LEFT_1:
536 *vaddr = (dregs->bpack_hi & 0xff00) >> 8;
537 break;
538 }
539
540
541 }
542
543 dvma_unmap(sun3_dma_orig_addr);
544 sun3_dma_orig_addr = NULL;
545
546 dregs->dma_addr_hi = 0;
547 dregs->dma_addr_lo = 0;
548 dregs->dma_count_hi = 0;
549 dregs->dma_count_lo = 0;
550
551 dregs->fifo_count = 0;
552 dregs->fifo_count_hi = 0;
553
554 dregs->csr &= ~CSR_SEND;
555
556// dregs->csr |= CSR_DMA_ENABLE;
557
558#if 0
559 /* reset fifo */
560 dregs->csr &= ~CSR_FIFO;
561 dregs->csr |= CSR_FIFO;
562#endif
563 sun3_dma_setup_done = NULL;
564
565 return ret;
566
567}
568
569#include "sun3_NCR5380.c"
570
Christoph Hellwigd0be4a7d2005-10-31 18:31:40 +0100571static struct scsi_host_template driver_template = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 .name = SUN3_SCSI_NAME,
573 .detect = sun3scsi_detect,
574 .release = sun3scsi_release,
575 .info = sun3scsi_info,
576 .queuecommand = sun3scsi_queue_command,
577 .eh_abort_handler = sun3scsi_abort,
578 .eh_bus_reset_handler = sun3scsi_bus_reset,
579 .can_queue = CAN_QUEUE,
580 .this_id = 7,
581 .sg_tablesize = SG_TABLESIZE,
582 .cmd_per_lun = CMD_PER_LUN,
583 .use_clustering = DISABLE_CLUSTERING
584};
585
586
587#include "scsi_module.c"
588
Adrian Bunk582df152008-04-14 17:17:26 +0300589MODULE_LICENSE("GPL");