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Viewing changes to drivers/scsi/sun3_scsi_vme.c

  • Committer: Package Import Robot
  • Author(s): Alessio Igor Bogani
  • Date: 2011-10-26 11:13:05 UTC
  • Revision ID: package-import@ubuntu.com-20111026111305-tz023xykf0i6eosh
Tags: upstream-3.2.0
Import upstream version 3.2.0

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drivers/scsi/sun3_scsi_vme.c
 
1
 /*
 
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>
 
23
#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
#define NDEBUG 0
 
43
 
 
44
#define NDEBUG_ABORT            0x00100000
 
45
#define NDEBUG_TAGS             0x00200000
 
46
#define NDEBUG_MERGING          0x00400000
 
47
 
 
48
#include "scsi.h"
 
49
#include "initio.h"
 
50
#include <scsi/scsi_host.h>
 
51
#include "sun3_scsi.h"
 
52
 
 
53
extern int sun3_map_test(unsigned long, char *);
 
54
 
 
55
#define USE_WRAPPER
 
56
/*#define RESET_BOOT */
 
57
#define DRIVER_SETUP
 
58
 
 
59
/*
 
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
 
 
73
static irqreturn_t scsi_sun3_intr(int irq, void *dummy);
 
74
static inline unsigned char sun3scsi_read(int reg);
 
75
static inline void sun3scsi_write(int reg, int value);
 
76
 
 
77
static int setup_can_queue = -1;
 
78
module_param(setup_can_queue, int, 0);
 
79
static int setup_cmd_per_lun = -1;
 
80
module_param(setup_cmd_per_lun, int, 0);
 
81
static int setup_sg_tablesize = -1;
 
82
module_param(setup_sg_tablesize, int, 0);
 
83
#ifdef SUPPORT_TAGS
 
84
static int setup_use_tagged_queuing = -1;
 
85
module_param(setup_use_tagged_queuing, int, 0);
 
86
#endif
 
87
static int setup_hostid = -1;
 
88
module_param(setup_hostid, int, 0);
 
89
 
 
90
static struct scsi_cmnd *sun3_dma_setup_done = NULL;
 
91
 
 
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
 
 
103
static volatile unsigned char *sun3_scsi_regp;
 
104
static volatile struct sun3_dma_regs *dregs;
 
105
#ifdef OLDDMA
 
106
static unsigned char *dmabuf = NULL; /* dma memory buffer */
 
107
#endif
 
108
static unsigned char *sun3_dma_orig_addr = NULL;
 
109
static unsigned long sun3_dma_orig_count = 0;
 
110
static int sun3_dma_active = 0;
 
111
static unsigned long last_residual = 0;
 
112
 
 
113
/*
 
114
 * NCR 5380 register access functions
 
115
 */
 
116
 
 
117
static inline unsigned char sun3scsi_read(int reg)
 
118
{
 
119
        return( sun3_scsi_regp[reg] );
 
120
}
 
121
 
 
122
static inline void sun3scsi_write(int reg, int value)
 
123
{
 
124
        sun3_scsi_regp[reg] = value;
 
125
}
 
126
 
 
127
/*
 
128
 * XXX: status debug
 
129
 */
 
130
static struct Scsi_Host *default_instance;
 
131
 
 
132
/*
 
133
 * Function : int sun3scsi_detect(struct scsi_host_template * tpnt)
 
134
 *
 
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
 
 
144
static int __init sun3scsi_detect(struct scsi_host_template * tpnt)
 
145
{
 
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,
 
237
                        0, "Sun3SCSI-5380VME", instance)) {
 
238
#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
 
 
283
int sun3scsi_release (struct Scsi_Host *shpnt)
 
284
{
 
285
        if (shpnt->irq != SCSI_IRQ_NONE)
 
286
                free_irq(shpnt->irq, shpnt);
 
287
 
 
288
        iounmap((void *)sun3_scsi_regp);
 
289
 
 
290
        NCR5380_exit(shpnt);
 
291
        return 0;
 
292
}
 
293
 
 
294
#ifdef RESET_BOOT
 
295
/*
 
296
 * Our 'bus reset on boot' function
 
297
 */
 
298
 
 
299
static 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
 
 
340
static const char * sun3scsi_info (struct Scsi_Host *spnt) {
 
341
    return "";
 
342
}
 
343
 
 
344
// safe bits for the CSR
 
345
#define CSR_GOOD 0x060f
 
346
 
 
347
static irqreturn_t scsi_sun3_intr(int irq, void *dummy)
 
348
{
 
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)) {
 
378
                NCR5380_intr(irq, dummy);
 
379
                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
 
392
void 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 */
 
407
static 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
 
 
457
static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance)
 
458
{
 
459
        return last_residual;
 
460
}
 
461
 
 
462
static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted,
 
463
                                                  struct scsi_cmnd *cmd,
 
464
                                                  int write_flag)
 
465
{
 
466
        if (cmd->request->cmd_type == REQ_TYPE_FS)
 
467
                return wanted;
 
468
        else
 
469
                return 0;
 
470
}
 
471
 
 
472
static 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 */
 
495
static 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
 
 
572
static struct scsi_host_template driver_template = {
 
573
        .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
 
 
590
MODULE_LICENSE("GPL");