blob: 7cb4a31453e6e3cb73813ddcec50beb2fa8b82fa [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>
28#include <asm/system.h>
29
30#include <asm/sun3ints.h>
31#include <asm/dvma.h>
32#include <asm/idprom.h>
33#include <asm/machines.h>
34
35#define SUN3_SCSI_VME
36
37#undef SUN3_SCSI_DEBUG
38
39/* dma on! */
40#define REAL_DMA
41
42#include "scsi.h"
Sam Creaseyc39e7ee2006-12-09 10:37:05 +010043#include "initio.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070044#include <scsi/scsi_host.h>
45#include "sun3_scsi.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47extern int sun3_map_test(unsigned long, char *);
48
49#define USE_WRAPPER
50/*#define RESET_BOOT */
51#define DRIVER_SETUP
52
53#define NDEBUG 0
54
55/*
56 * BUG can be used to trigger a strange code-size related hang on 2.1 kernels
57 */
58#ifdef BUG
59#undef RESET_BOOT
60#undef DRIVER_SETUP
61#endif
62
63/* #define SUPPORT_TAGS */
64
65//#define ENABLE_IRQ() enable_irq( SUN3_VEC_VMESCSI0 );
66#define ENABLE_IRQ()
67
68
David Howells7d12e782006-10-05 14:55:46 +010069static irqreturn_t scsi_sun3_intr(int irq, void *dummy);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070static inline unsigned char sun3scsi_read(int reg);
71static inline void sun3scsi_write(int reg, int value);
72
73static int setup_can_queue = -1;
74module_param(setup_can_queue, int, 0);
75static int setup_cmd_per_lun = -1;
76module_param(setup_cmd_per_lun, int, 0);
77static int setup_sg_tablesize = -1;
78module_param(setup_sg_tablesize, int, 0);
79#ifdef SUPPORT_TAGS
80static int setup_use_tagged_queuing = -1;
81module_param(setup_use_tagged_queuing, int, 0);
82#endif
83static int setup_hostid = -1;
84module_param(setup_hostid, int, 0);
85
Henne811c9362006-10-03 19:51:59 +020086static struct scsi_cmnd *sun3_dma_setup_done = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070087
88#define AFTER_RESET_DELAY (HZ/2)
89
90/* ms to wait after hitting dma regs */
91#define SUN3_DMA_DELAY 10
92
93/* dvma buffer to allocate -- 32k should hopefully be more than sufficient */
94#define SUN3_DVMA_BUFSIZE 0xe000
95
96/* minimum number of bytes to do dma on */
97#define SUN3_DMA_MINSIZE 128
98
99static volatile unsigned char *sun3_scsi_regp;
100static volatile struct sun3_dma_regs *dregs;
101#ifdef OLDDMA
102static unsigned char *dmabuf = NULL; /* dma memory buffer */
103#endif
104static unsigned char *sun3_dma_orig_addr = NULL;
105static unsigned long sun3_dma_orig_count = 0;
106static int sun3_dma_active = 0;
107static unsigned long last_residual = 0;
108
109/*
110 * NCR 5380 register access functions
111 */
112
113static inline unsigned char sun3scsi_read(int reg)
114{
115 return( sun3_scsi_regp[reg] );
116}
117
118static inline void sun3scsi_write(int reg, int value)
119{
120 sun3_scsi_regp[reg] = value;
121}
122
123/*
124 * XXX: status debug
125 */
126static struct Scsi_Host *default_instance;
127
128/*
Christoph Hellwigd0be4a7d2005-10-31 18:31:40 +0100129 * Function : int sun3scsi_detect(struct scsi_host_template * tpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 *
131 * Purpose : initializes mac NCR5380 driver based on the
132 * command line / compile time port and irq definitions.
133 *
134 * Inputs : tpnt - template for this SCSI adapter.
135 *
136 * Returns : 1 if a host adapter was found, 0 if not.
137 *
138 */
139
Christoph Hellwigd0be4a7d2005-10-31 18:31:40 +0100140static int sun3scsi_detect(struct scsi_host_template * tpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141{
142 unsigned long ioaddr, irq = 0;
143 static int called = 0;
144 struct Scsi_Host *instance;
145 int i;
146 unsigned long addrs[3] = { IOBASE_SUN3_VMESCSI,
147 IOBASE_SUN3_VMESCSI + 0x4000,
148 0 };
149 unsigned long vecs[3] = { SUN3_VEC_VMESCSI0,
150 SUN3_VEC_VMESCSI1,
151 0 };
152 /* check that this machine has an onboard 5380 */
153 switch(idprom->id_machtype) {
154 case SM_SUN3|SM_3_160:
155 case SM_SUN3|SM_3_260:
156 break;
157
158 default:
159 return 0;
160 }
161
162 if(called)
163 return 0;
164
165 tpnt->proc_name = "Sun3 5380 VME SCSI";
166
167 /* setup variables */
168 tpnt->can_queue =
169 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
170 tpnt->cmd_per_lun =
171 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
172 tpnt->sg_tablesize =
173 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
174
175 if (setup_hostid >= 0)
176 tpnt->this_id = setup_hostid;
177 else {
178 /* use 7 as default */
179 tpnt->this_id = 7;
180 }
181
182 ioaddr = 0;
183 for(i = 0; addrs[i] != 0; i++) {
184 unsigned char x;
185
186 ioaddr = (unsigned long)sun3_ioremap(addrs[i], PAGE_SIZE,
187 SUN3_PAGE_TYPE_VME16);
188 irq = vecs[i];
189 sun3_scsi_regp = (unsigned char *)ioaddr;
190
191 dregs = (struct sun3_dma_regs *)(((unsigned char *)ioaddr) + 8);
192
193 if(sun3_map_test((unsigned long)dregs, &x)) {
194 unsigned short oldcsr;
195
196 oldcsr = dregs->csr;
197 dregs->csr = 0;
198 udelay(SUN3_DMA_DELAY);
199 if(dregs->csr == 0x1400)
200 break;
201
202 dregs->csr = oldcsr;
203 }
204
205 iounmap((void *)ioaddr);
206 ioaddr = 0;
207 }
208
209 if(!ioaddr)
210 return 0;
211
212#ifdef SUPPORT_TAGS
213 if (setup_use_tagged_queuing < 0)
214 setup_use_tagged_queuing = USE_TAGGED_QUEUING;
215#endif
216
217 instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
218 if(instance == NULL)
219 return 0;
220
221 default_instance = instance;
222
223 instance->io_port = (unsigned long) ioaddr;
224 instance->irq = irq;
225
226 NCR5380_init(instance, 0);
227
228 instance->n_io_port = 32;
229
230 ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
231
232 if (request_irq(instance->irq, scsi_sun3_intr,
233 0, "Sun3SCSI-5380VME", NULL)) {
234#ifndef REAL_DMA
235 printk("scsi%d: IRQ%d not free, interrupts disabled\n",
236 instance->host_no, instance->irq);
237 instance->irq = SCSI_IRQ_NONE;
238#else
239 printk("scsi%d: IRQ%d not free, bailing out\n",
240 instance->host_no, instance->irq);
241 return 0;
242#endif
243 }
244
245 printk("scsi%d: Sun3 5380 VME at port %lX irq", instance->host_no, instance->io_port);
246 if (instance->irq == SCSI_IRQ_NONE)
247 printk ("s disabled");
248 else
249 printk (" %d", instance->irq);
250 printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
251 instance->can_queue, instance->cmd_per_lun,
252 SUN3SCSI_PUBLIC_RELEASE);
253 printk("\nscsi%d:", instance->host_no);
254 NCR5380_print_options(instance);
255 printk("\n");
256
257 dregs->csr = 0;
258 udelay(SUN3_DMA_DELAY);
259 dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR;
260 udelay(SUN3_DMA_DELAY);
261 dregs->fifo_count = 0;
262 dregs->fifo_count_hi = 0;
263 dregs->dma_addr_hi = 0;
264 dregs->dma_addr_lo = 0;
265 dregs->dma_count_hi = 0;
266 dregs->dma_count_lo = 0;
267
268 dregs->ivect = VME_DATA24 | (instance->irq & 0xff);
269
270 called = 1;
271
272#ifdef RESET_BOOT
273 sun3_scsi_reset_boot(instance);
274#endif
275
276 return 1;
277}
278
279int sun3scsi_release (struct Scsi_Host *shpnt)
280{
281 if (shpnt->irq != SCSI_IRQ_NONE)
282 free_irq (shpnt->irq, NULL);
283
284 iounmap((void *)sun3_scsi_regp);
285
286 return 0;
287}
288
289#ifdef RESET_BOOT
290/*
291 * Our 'bus reset on boot' function
292 */
293
294static void sun3_scsi_reset_boot(struct Scsi_Host *instance)
295{
296 unsigned long end;
297
298 NCR5380_local_declare();
299 NCR5380_setup(instance);
300
301 /*
302 * Do a SCSI reset to clean up the bus during initialization. No
303 * messing with the queues, interrupts, or locks necessary here.
304 */
305
306 printk( "Sun3 SCSI: resetting the SCSI bus..." );
307
308 /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
309// sun3_disable_irq( IRQ_SUN3_SCSI );
310
311 /* get in phase */
312 NCR5380_write( TARGET_COMMAND_REG,
313 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
314
315 /* assert RST */
316 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
317
318 /* The min. reset hold time is 25us, so 40us should be enough */
319 udelay( 50 );
320
321 /* reset RST and interrupt */
322 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
323 NCR5380_read( RESET_PARITY_INTERRUPT_REG );
324
325 for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
326 barrier();
327
328 /* switch on SCSI IRQ again */
329// sun3_enable_irq( IRQ_SUN3_SCSI );
330
331 printk( " done\n" );
332}
333#endif
334
335static const char * sun3scsi_info (struct Scsi_Host *spnt) {
336 return "";
337}
338
339// safe bits for the CSR
340#define CSR_GOOD 0x060f
341
David Howells7d12e782006-10-05 14:55:46 +0100342static irqreturn_t scsi_sun3_intr(int irq, void *dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343{
344 unsigned short csr = dregs->csr;
345 int handled = 0;
346
347 dregs->csr &= ~CSR_DMA_ENABLE;
348
349
350#ifdef SUN3_SCSI_DEBUG
351 printk("scsi_intr csr %x\n", csr);
352#endif
353
354 if(csr & ~CSR_GOOD) {
355 if(csr & CSR_DMA_BUSERR) {
356 printk("scsi%d: bus error in dma\n", default_instance->host_no);
357#ifdef SUN3_SCSI_DEBUG
358 printk("scsi: residual %x count %x addr %p dmaaddr %x\n",
359 dregs->fifo_count,
360 dregs->dma_count_lo | (dregs->dma_count_hi << 16),
361 sun3_dma_orig_addr,
362 dregs->dma_addr_lo | (dregs->dma_addr_hi << 16));
363#endif
364 }
365
366 if(csr & CSR_DMA_CONFLICT) {
367 printk("scsi%d: dma conflict\n", default_instance->host_no);
368 }
369 handled = 1;
370 }
371
372 if(csr & (CSR_SDB_INT | CSR_DMA_INT)) {
David Howells7d12e782006-10-05 14:55:46 +0100373 NCR5380_intr(irq, dummy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 handled = 1;
375 }
376
377 return IRQ_RETVAL(handled);
378}
379
380/*
381 * Debug stuff - to be called on NMI, or sysrq key. Use at your own risk;
382 * reentering NCR5380_print_status seems to have ugly side effects
383 */
384
385/* this doesn't seem to get used at all -- sam */
386#if 0
387void sun3_sun3_debug (void)
388{
389 unsigned long flags;
390 NCR5380_local_declare();
391
392 if (default_instance) {
393 local_irq_save(flags);
394 NCR5380_print_status(default_instance);
395 local_irq_restore(flags);
396 }
397}
398#endif
399
400
401/* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */
402static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag)
403{
404 void *addr;
405
406 if(sun3_dma_orig_addr != NULL)
407 dvma_unmap(sun3_dma_orig_addr);
408
409// addr = sun3_dvma_page((unsigned long)data, (unsigned long)dmabuf);
410 addr = (void *)dvma_map_vme((unsigned long) data, count);
411
412 sun3_dma_orig_addr = addr;
413 sun3_dma_orig_count = count;
414
415#ifdef SUN3_SCSI_DEBUG
416 printk("scsi: dma_setup addr %p count %x\n", addr, count);
417#endif
418
419// dregs->fifo_count = 0;
420#if 0
421 /* reset fifo */
422 dregs->csr &= ~CSR_FIFO;
423 dregs->csr |= CSR_FIFO;
424#endif
425 /* set direction */
426 if(write_flag)
427 dregs->csr |= CSR_SEND;
428 else
429 dregs->csr &= ~CSR_SEND;
430
431 /* reset fifo */
432// dregs->csr &= ~CSR_FIFO;
433// dregs->csr |= CSR_FIFO;
434
435 dregs->csr |= CSR_PACK_ENABLE;
436
437 dregs->dma_addr_hi = ((unsigned long)addr >> 16);
438 dregs->dma_addr_lo = ((unsigned long)addr & 0xffff);
439
440 dregs->dma_count_hi = 0;
441 dregs->dma_count_lo = 0;
442 dregs->fifo_count_hi = 0;
443 dregs->fifo_count = 0;
444
445#ifdef SUN3_SCSI_DEBUG
446 printk("scsi: dma_setup done csr %x\n", dregs->csr);
447#endif
448 return count;
449
450}
451
452static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance)
453{
454 return last_residual;
455}
456
Henne811c9362006-10-03 19:51:59 +0200457static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted,
458 struct scsi_cmnd *cmd,
459 int write_flag)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460{
Jens Axboe4aff5e22006-08-10 08:44:47 +0200461 if(blk_fs_request(cmd->request))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 return wanted;
463 else
464 return 0;
465}
466
467static int sun3scsi_dma_start(unsigned long count, char *data)
468{
469
470 unsigned short csr;
471
472 csr = dregs->csr;
473#ifdef SUN3_SCSI_DEBUG
474 printk("scsi: dma_start data %p count %x csr %x fifo %x\n", data, count, csr, dregs->fifo_count);
475#endif
476
477 dregs->dma_count_hi = (sun3_dma_orig_count >> 16);
478 dregs->dma_count_lo = (sun3_dma_orig_count & 0xffff);
479
480 dregs->fifo_count_hi = (sun3_dma_orig_count >> 16);
481 dregs->fifo_count = (sun3_dma_orig_count & 0xffff);
482
483// if(!(csr & CSR_DMA_ENABLE))
484// dregs->csr |= CSR_DMA_ENABLE;
485
486 return 0;
487}
488
489/* clean up after our dma is done */
490static int sun3scsi_dma_finish(int write_flag)
491{
492 unsigned short fifo;
493 int ret = 0;
494
495 sun3_dma_active = 0;
496
497 dregs->csr &= ~CSR_DMA_ENABLE;
498
499 fifo = dregs->fifo_count;
500 if(write_flag) {
501 if((fifo > 0) && (fifo < sun3_dma_orig_count))
502 fifo++;
503 }
504
505 last_residual = fifo;
506#ifdef SUN3_SCSI_DEBUG
507 printk("scsi: residual %x total %x\n", fifo, sun3_dma_orig_count);
508#endif
509 /* empty bytes from the fifo which didn't make it */
510 if((!write_flag) && (dregs->csr & CSR_LEFT)) {
511 unsigned char *vaddr;
512
513#ifdef SUN3_SCSI_DEBUG
514 printk("scsi: got left over bytes\n");
515#endif
516
517 vaddr = (unsigned char *)dvma_vmetov(sun3_dma_orig_addr);
518
519 vaddr += (sun3_dma_orig_count - fifo);
520 vaddr--;
521
522 switch(dregs->csr & CSR_LEFT) {
523 case CSR_LEFT_3:
524 *vaddr = (dregs->bpack_lo & 0xff00) >> 8;
525 vaddr--;
526
527 case CSR_LEFT_2:
528 *vaddr = (dregs->bpack_hi & 0x00ff);
529 vaddr--;
530
531 case CSR_LEFT_1:
532 *vaddr = (dregs->bpack_hi & 0xff00) >> 8;
533 break;
534 }
535
536
537 }
538
539 dvma_unmap(sun3_dma_orig_addr);
540 sun3_dma_orig_addr = NULL;
541
542 dregs->dma_addr_hi = 0;
543 dregs->dma_addr_lo = 0;
544 dregs->dma_count_hi = 0;
545 dregs->dma_count_lo = 0;
546
547 dregs->fifo_count = 0;
548 dregs->fifo_count_hi = 0;
549
550 dregs->csr &= ~CSR_SEND;
551
552// dregs->csr |= CSR_DMA_ENABLE;
553
554#if 0
555 /* reset fifo */
556 dregs->csr &= ~CSR_FIFO;
557 dregs->csr |= CSR_FIFO;
558#endif
559 sun3_dma_setup_done = NULL;
560
561 return ret;
562
563}
564
565#include "sun3_NCR5380.c"
566
Christoph Hellwigd0be4a7d2005-10-31 18:31:40 +0100567static struct scsi_host_template driver_template = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 .name = SUN3_SCSI_NAME,
569 .detect = sun3scsi_detect,
570 .release = sun3scsi_release,
571 .info = sun3scsi_info,
572 .queuecommand = sun3scsi_queue_command,
573 .eh_abort_handler = sun3scsi_abort,
574 .eh_bus_reset_handler = sun3scsi_bus_reset,
575 .can_queue = CAN_QUEUE,
576 .this_id = 7,
577 .sg_tablesize = SG_TABLESIZE,
578 .cmd_per_lun = CMD_PER_LUN,
579 .use_clustering = DISABLE_CLUSTERING
580};
581
582
583#include "scsi_module.c"
584