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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
Geert Uytterhoeven2ba51ea2011-06-13 20:39:21 +020042#define NDEBUG 0
43
44#define NDEBUG_ABORT 0x00100000
45#define NDEBUG_TAGS 0x00200000
46#define NDEBUG_MERGING 0x00400000
47
Linus Torvalds1da177e2005-04-16 15:20:36 -070048#include "scsi.h"
Sam Creaseyc39e7ee2006-12-09 10:37:05 +010049#include "initio.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <scsi/scsi_host.h>
51#include "sun3_scsi.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53extern int sun3_map_test(unsigned long, char *);
54
55#define USE_WRAPPER
56/*#define RESET_BOOT */
57#define DRIVER_SETUP
58
Linus Torvalds1da177e2005-04-16 15:20:36 -070059/*
60 * BUG can be used to trigger a strange code-size related hang on 2.1 kernels
61 */
62#ifdef BUG
63#undef RESET_BOOT
64#undef DRIVER_SETUP
65#endif
66
67/* #define SUPPORT_TAGS */
68
69//#define ENABLE_IRQ() enable_irq( SUN3_VEC_VMESCSI0 );
70#define ENABLE_IRQ()
71
72
David Howells7d12e782006-10-05 14:55:46 +010073static irqreturn_t scsi_sun3_intr(int irq, void *dummy);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074static inline unsigned char sun3scsi_read(int reg);
75static inline void sun3scsi_write(int reg, int value);
76
77static int setup_can_queue = -1;
78module_param(setup_can_queue, int, 0);
79static int setup_cmd_per_lun = -1;
80module_param(setup_cmd_per_lun, int, 0);
81static int setup_sg_tablesize = -1;
82module_param(setup_sg_tablesize, int, 0);
83#ifdef SUPPORT_TAGS
84static int setup_use_tagged_queuing = -1;
85module_param(setup_use_tagged_queuing, int, 0);
86#endif
87static int setup_hostid = -1;
88module_param(setup_hostid, int, 0);
89
Henne811c9362006-10-03 19:51:59 +020090static struct scsi_cmnd *sun3_dma_setup_done = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
92#define AFTER_RESET_DELAY (HZ/2)
93
94/* ms to wait after hitting dma regs */
95#define SUN3_DMA_DELAY 10
96
97/* dvma buffer to allocate -- 32k should hopefully be more than sufficient */
98#define SUN3_DVMA_BUFSIZE 0xe000
99
100/* minimum number of bytes to do dma on */
101#define SUN3_DMA_MINSIZE 128
102
103static volatile unsigned char *sun3_scsi_regp;
104static volatile struct sun3_dma_regs *dregs;
105#ifdef OLDDMA
106static unsigned char *dmabuf = NULL; /* dma memory buffer */
107#endif
108static unsigned char *sun3_dma_orig_addr = NULL;
109static unsigned long sun3_dma_orig_count = 0;
110static int sun3_dma_active = 0;
111static unsigned long last_residual = 0;
112
113/*
114 * NCR 5380 register access functions
115 */
116
117static inline unsigned char sun3scsi_read(int reg)
118{
119 return( sun3_scsi_regp[reg] );
120}
121
122static inline void sun3scsi_write(int reg, int value)
123{
124 sun3_scsi_regp[reg] = value;
125}
126
127/*
128 * XXX: status debug
129 */
130static struct Scsi_Host *default_instance;
131
132/*
Christoph Hellwigd0be4a7d2005-10-31 18:31:40 +0100133 * Function : int sun3scsi_detect(struct scsi_host_template * tpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 *
135 * Purpose : initializes mac NCR5380 driver based on the
136 * command line / compile time port and irq definitions.
137 *
138 * Inputs : tpnt - template for this SCSI adapter.
139 *
140 * Returns : 1 if a host adapter was found, 0 if not.
141 *
142 */
143
Geert Uytterhoevend559c492011-06-13 20:39:18 +0200144static int __init sun3scsi_detect(struct scsi_host_template * tpnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145{
146 unsigned long ioaddr, irq = 0;
147 static int called = 0;
148 struct Scsi_Host *instance;
149 int i;
150 unsigned long addrs[3] = { IOBASE_SUN3_VMESCSI,
151 IOBASE_SUN3_VMESCSI + 0x4000,
152 0 };
153 unsigned long vecs[3] = { SUN3_VEC_VMESCSI0,
154 SUN3_VEC_VMESCSI1,
155 0 };
156 /* check that this machine has an onboard 5380 */
157 switch(idprom->id_machtype) {
158 case SM_SUN3|SM_3_160:
159 case SM_SUN3|SM_3_260:
160 break;
161
162 default:
163 return 0;
164 }
165
166 if(called)
167 return 0;
168
169 tpnt->proc_name = "Sun3 5380 VME SCSI";
170
171 /* setup variables */
172 tpnt->can_queue =
173 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
174 tpnt->cmd_per_lun =
175 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
176 tpnt->sg_tablesize =
177 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
178
179 if (setup_hostid >= 0)
180 tpnt->this_id = setup_hostid;
181 else {
182 /* use 7 as default */
183 tpnt->this_id = 7;
184 }
185
186 ioaddr = 0;
187 for(i = 0; addrs[i] != 0; i++) {
188 unsigned char x;
189
190 ioaddr = (unsigned long)sun3_ioremap(addrs[i], PAGE_SIZE,
191 SUN3_PAGE_TYPE_VME16);
192 irq = vecs[i];
193 sun3_scsi_regp = (unsigned char *)ioaddr;
194
195 dregs = (struct sun3_dma_regs *)(((unsigned char *)ioaddr) + 8);
196
197 if(sun3_map_test((unsigned long)dregs, &x)) {
198 unsigned short oldcsr;
199
200 oldcsr = dregs->csr;
201 dregs->csr = 0;
202 udelay(SUN3_DMA_DELAY);
203 if(dregs->csr == 0x1400)
204 break;
205
206 dregs->csr = oldcsr;
207 }
208
209 iounmap((void *)ioaddr);
210 ioaddr = 0;
211 }
212
213 if(!ioaddr)
214 return 0;
215
216#ifdef SUPPORT_TAGS
217 if (setup_use_tagged_queuing < 0)
218 setup_use_tagged_queuing = USE_TAGGED_QUEUING;
219#endif
220
221 instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
222 if(instance == NULL)
223 return 0;
224
225 default_instance = instance;
226
227 instance->io_port = (unsigned long) ioaddr;
228 instance->irq = irq;
229
230 NCR5380_init(instance, 0);
231
232 instance->n_io_port = 32;
233
234 ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
235
236 if (request_irq(instance->irq, scsi_sun3_intr,
Jeff Garzik1e641662007-11-11 19:52:05 -0500237 0, "Sun3SCSI-5380VME", instance)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238#ifndef REAL_DMA
239 printk("scsi%d: IRQ%d not free, interrupts disabled\n",
240 instance->host_no, instance->irq);
241 instance->irq = SCSI_IRQ_NONE;
242#else
243 printk("scsi%d: IRQ%d not free, bailing out\n",
244 instance->host_no, instance->irq);
245 return 0;
246#endif
247 }
248
249 printk("scsi%d: Sun3 5380 VME at port %lX irq", instance->host_no, instance->io_port);
250 if (instance->irq == SCSI_IRQ_NONE)
251 printk ("s disabled");
252 else
253 printk (" %d", instance->irq);
254 printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
255 instance->can_queue, instance->cmd_per_lun,
256 SUN3SCSI_PUBLIC_RELEASE);
257 printk("\nscsi%d:", instance->host_no);
258 NCR5380_print_options(instance);
259 printk("\n");
260
261 dregs->csr = 0;
262 udelay(SUN3_DMA_DELAY);
263 dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR;
264 udelay(SUN3_DMA_DELAY);
265 dregs->fifo_count = 0;
266 dregs->fifo_count_hi = 0;
267 dregs->dma_addr_hi = 0;
268 dregs->dma_addr_lo = 0;
269 dregs->dma_count_hi = 0;
270 dregs->dma_count_lo = 0;
271
272 dregs->ivect = VME_DATA24 | (instance->irq & 0xff);
273
274 called = 1;
275
276#ifdef RESET_BOOT
277 sun3_scsi_reset_boot(instance);
278#endif
279
280 return 1;
281}
282
283int sun3scsi_release (struct Scsi_Host *shpnt)
284{
285 if (shpnt->irq != SCSI_IRQ_NONE)
Jeff Garzik1e641662007-11-11 19:52:05 -0500286 free_irq(shpnt->irq, shpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287
288 iounmap((void *)sun3_scsi_regp);
289
Geert Uytterhoeven19b6c512011-06-13 20:39:19 +0200290 NCR5380_exit(shpnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 return 0;
292}
293
294#ifdef RESET_BOOT
295/*
296 * Our 'bus reset on boot' function
297 */
298
299static void sun3_scsi_reset_boot(struct Scsi_Host *instance)
300{
301 unsigned long end;
302
303 NCR5380_local_declare();
304 NCR5380_setup(instance);
305
306 /*
307 * Do a SCSI reset to clean up the bus during initialization. No
308 * messing with the queues, interrupts, or locks necessary here.
309 */
310
311 printk( "Sun3 SCSI: resetting the SCSI bus..." );
312
313 /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
314// sun3_disable_irq( IRQ_SUN3_SCSI );
315
316 /* get in phase */
317 NCR5380_write( TARGET_COMMAND_REG,
318 PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
319
320 /* assert RST */
321 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
322
323 /* The min. reset hold time is 25us, so 40us should be enough */
324 udelay( 50 );
325
326 /* reset RST and interrupt */
327 NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
328 NCR5380_read( RESET_PARITY_INTERRUPT_REG );
329
330 for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
331 barrier();
332
333 /* switch on SCSI IRQ again */
334// sun3_enable_irq( IRQ_SUN3_SCSI );
335
336 printk( " done\n" );
337}
338#endif
339
340static const char * sun3scsi_info (struct Scsi_Host *spnt) {
341 return "";
342}
343
344// safe bits for the CSR
345#define CSR_GOOD 0x060f
346
David Howells7d12e782006-10-05 14:55:46 +0100347static irqreturn_t scsi_sun3_intr(int irq, void *dummy)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348{
349 unsigned short csr = dregs->csr;
350 int handled = 0;
351
352 dregs->csr &= ~CSR_DMA_ENABLE;
353
354
355#ifdef SUN3_SCSI_DEBUG
356 printk("scsi_intr csr %x\n", csr);
357#endif
358
359 if(csr & ~CSR_GOOD) {
360 if(csr & CSR_DMA_BUSERR) {
361 printk("scsi%d: bus error in dma\n", default_instance->host_no);
362#ifdef SUN3_SCSI_DEBUG
363 printk("scsi: residual %x count %x addr %p dmaaddr %x\n",
364 dregs->fifo_count,
365 dregs->dma_count_lo | (dregs->dma_count_hi << 16),
366 sun3_dma_orig_addr,
367 dregs->dma_addr_lo | (dregs->dma_addr_hi << 16));
368#endif
369 }
370
371 if(csr & CSR_DMA_CONFLICT) {
372 printk("scsi%d: dma conflict\n", default_instance->host_no);
373 }
374 handled = 1;
375 }
376
377 if(csr & (CSR_SDB_INT | CSR_DMA_INT)) {
David Howells7d12e782006-10-05 14:55:46 +0100378 NCR5380_intr(irq, dummy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 handled = 1;
380 }
381
382 return IRQ_RETVAL(handled);
383}
384
385/*
386 * Debug stuff - to be called on NMI, or sysrq key. Use at your own risk;
387 * reentering NCR5380_print_status seems to have ugly side effects
388 */
389
390/* this doesn't seem to get used at all -- sam */
391#if 0
392void sun3_sun3_debug (void)
393{
394 unsigned long flags;
395 NCR5380_local_declare();
396
397 if (default_instance) {
398 local_irq_save(flags);
399 NCR5380_print_status(default_instance);
400 local_irq_restore(flags);
401 }
402}
403#endif
404
405
406/* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */
407static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag)
408{
409 void *addr;
410
411 if(sun3_dma_orig_addr != NULL)
412 dvma_unmap(sun3_dma_orig_addr);
413
414// addr = sun3_dvma_page((unsigned long)data, (unsigned long)dmabuf);
415 addr = (void *)dvma_map_vme((unsigned long) data, count);
416
417 sun3_dma_orig_addr = addr;
418 sun3_dma_orig_count = count;
419
420#ifdef SUN3_SCSI_DEBUG
421 printk("scsi: dma_setup addr %p count %x\n", addr, count);
422#endif
423
424// dregs->fifo_count = 0;
425#if 0
426 /* reset fifo */
427 dregs->csr &= ~CSR_FIFO;
428 dregs->csr |= CSR_FIFO;
429#endif
430 /* set direction */
431 if(write_flag)
432 dregs->csr |= CSR_SEND;
433 else
434 dregs->csr &= ~CSR_SEND;
435
436 /* reset fifo */
437// dregs->csr &= ~CSR_FIFO;
438// dregs->csr |= CSR_FIFO;
439
440 dregs->csr |= CSR_PACK_ENABLE;
441
442 dregs->dma_addr_hi = ((unsigned long)addr >> 16);
443 dregs->dma_addr_lo = ((unsigned long)addr & 0xffff);
444
445 dregs->dma_count_hi = 0;
446 dregs->dma_count_lo = 0;
447 dregs->fifo_count_hi = 0;
448 dregs->fifo_count = 0;
449
450#ifdef SUN3_SCSI_DEBUG
451 printk("scsi: dma_setup done csr %x\n", dregs->csr);
452#endif
453 return count;
454
455}
456
457static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance)
458{
459 return last_residual;
460}
461
Henne811c9362006-10-03 19:51:59 +0200462static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted,
463 struct scsi_cmnd *cmd,
464 int write_flag)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465{
Christoph Hellwig33659eb2010-08-07 18:17:56 +0200466 if (cmd->request->cmd_type == REQ_TYPE_FS)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467 return wanted;
468 else
469 return 0;
470}
471
472static int sun3scsi_dma_start(unsigned long count, char *data)
473{
474
475 unsigned short csr;
476
477 csr = dregs->csr;
478#ifdef SUN3_SCSI_DEBUG
479 printk("scsi: dma_start data %p count %x csr %x fifo %x\n", data, count, csr, dregs->fifo_count);
480#endif
481
482 dregs->dma_count_hi = (sun3_dma_orig_count >> 16);
483 dregs->dma_count_lo = (sun3_dma_orig_count & 0xffff);
484
485 dregs->fifo_count_hi = (sun3_dma_orig_count >> 16);
486 dregs->fifo_count = (sun3_dma_orig_count & 0xffff);
487
488// if(!(csr & CSR_DMA_ENABLE))
489// dregs->csr |= CSR_DMA_ENABLE;
490
491 return 0;
492}
493
494/* clean up after our dma is done */
495static int sun3scsi_dma_finish(int write_flag)
496{
497 unsigned short fifo;
498 int ret = 0;
499
500 sun3_dma_active = 0;
501
502 dregs->csr &= ~CSR_DMA_ENABLE;
503
504 fifo = dregs->fifo_count;
505 if(write_flag) {
506 if((fifo > 0) && (fifo < sun3_dma_orig_count))
507 fifo++;
508 }
509
510 last_residual = fifo;
511#ifdef SUN3_SCSI_DEBUG
512 printk("scsi: residual %x total %x\n", fifo, sun3_dma_orig_count);
513#endif
514 /* empty bytes from the fifo which didn't make it */
515 if((!write_flag) && (dregs->csr & CSR_LEFT)) {
516 unsigned char *vaddr;
517
518#ifdef SUN3_SCSI_DEBUG
519 printk("scsi: got left over bytes\n");
520#endif
521
522 vaddr = (unsigned char *)dvma_vmetov(sun3_dma_orig_addr);
523
524 vaddr += (sun3_dma_orig_count - fifo);
525 vaddr--;
526
527 switch(dregs->csr & CSR_LEFT) {
528 case CSR_LEFT_3:
529 *vaddr = (dregs->bpack_lo & 0xff00) >> 8;
530 vaddr--;
531
532 case CSR_LEFT_2:
533 *vaddr = (dregs->bpack_hi & 0x00ff);
534 vaddr--;
535
536 case CSR_LEFT_1:
537 *vaddr = (dregs->bpack_hi & 0xff00) >> 8;
538 break;
539 }
540
541
542 }
543
544 dvma_unmap(sun3_dma_orig_addr);
545 sun3_dma_orig_addr = NULL;
546
547 dregs->dma_addr_hi = 0;
548 dregs->dma_addr_lo = 0;
549 dregs->dma_count_hi = 0;
550 dregs->dma_count_lo = 0;
551
552 dregs->fifo_count = 0;
553 dregs->fifo_count_hi = 0;
554
555 dregs->csr &= ~CSR_SEND;
556
557// dregs->csr |= CSR_DMA_ENABLE;
558
559#if 0
560 /* reset fifo */
561 dregs->csr &= ~CSR_FIFO;
562 dregs->csr |= CSR_FIFO;
563#endif
564 sun3_dma_setup_done = NULL;
565
566 return ret;
567
568}
569
570#include "sun3_NCR5380.c"
571
Christoph Hellwigd0be4a7d2005-10-31 18:31:40 +0100572static struct scsi_host_template driver_template = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 .name = SUN3_SCSI_NAME,
574 .detect = sun3scsi_detect,
575 .release = sun3scsi_release,
576 .info = sun3scsi_info,
577 .queuecommand = sun3scsi_queue_command,
578 .eh_abort_handler = sun3scsi_abort,
579 .eh_bus_reset_handler = sun3scsi_bus_reset,
580 .can_queue = CAN_QUEUE,
581 .this_id = 7,
582 .sg_tablesize = SG_TABLESIZE,
583 .cmd_per_lun = CMD_PER_LUN,
584 .use_clustering = DISABLE_CLUSTERING
585};
586
587
588#include "scsi_module.c"
589
Adrian Bunk582df152008-04-14 17:17:26 +0300590MODULE_LICENSE("GPL");