config: tegra3: enable /dev mount with ACL
[linux-2.6.git] / drivers / scsi / sun3_scsi.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  * Adapted from mac_scsinew.c:
7  */
8 /*
9  * Generic Macintosh NCR5380 driver
10  *
11  * Copyright 1998, Michael Schmitz <mschmitz@lbl.gov>
12  *
13  * derived in part from:
14  */
15 /*
16  * Generic Generic NCR5380 driver
17  *
18  * Copyright 1995, Russell King
19  *
20  * ALPHA RELEASE 1.
21  *
22  * For more information, please consult
23  *
24  * NCR 5380 Family
25  * SCSI Protocol Controller
26  * Databook
27  *
28  * NCR Microelectronics
29  * 1635 Aeroplaza Drive
30  * Colorado Springs, CO 80916
31  * 1+ (719) 578-3400
32  * 1+ (800) 334-5454
33  */
34
35
36 /*
37  * This is from mac_scsi.h, but hey, maybe this is useful for Sun3 too! :)
38  *
39  * Options :
40  *
41  * PARITY - enable parity checking.  Not supported.
42  *
43  * SCSI2 - enable support for SCSI-II tagged queueing.  Untested.
44  *
45  * USLEEP - enable support for devices that don't disconnect.  Untested.
46  */
47
48 /*
49  * $Log: sun3_NCR5380.c,v $
50  */
51
52 #define AUTOSENSE
53
54 #include <linux/types.h>
55 #include <linux/stddef.h>
56 #include <linux/ctype.h>
57 #include <linux/delay.h>
58
59 #include <linux/module.h>
60 #include <linux/signal.h>
61 #include <linux/ioport.h>
62 #include <linux/init.h>
63 #include <linux/blkdev.h>
64
65 #include <asm/io.h>
66 #include <asm/system.h>
67
68 #include <asm/sun3ints.h>
69 #include <asm/dvma.h>
70 #include <asm/idprom.h>
71 #include <asm/machines.h>
72
73 #define NDEBUG 0
74
75 #define NDEBUG_ABORT            0x00100000
76 #define NDEBUG_TAGS             0x00200000
77 #define NDEBUG_MERGING          0x00400000
78
79 /* dma on! */
80 #define REAL_DMA
81
82 #include "scsi.h"
83 #include "initio.h"
84 #include <scsi/scsi_host.h>
85 #include "sun3_scsi.h"
86
87 static void NCR5380_print(struct Scsi_Host *instance);
88
89 /* #define OLDDMA */
90
91 #define USE_WRAPPER
92 /*#define RESET_BOOT */
93 #define DRIVER_SETUP
94
95 /*
96  * BUG can be used to trigger a strange code-size related hang on 2.1 kernels
97  */
98 #ifdef BUG
99 #undef RESET_BOOT
100 #undef DRIVER_SETUP
101 #endif
102
103 /* #define SUPPORT_TAGS */
104
105 #define ENABLE_IRQ()    enable_irq( IRQ_SUN3_SCSI ); 
106
107
108 static irqreturn_t scsi_sun3_intr(int irq, void *dummy);
109 static inline unsigned char sun3scsi_read(int reg);
110 static inline void sun3scsi_write(int reg, int value);
111
112 static int setup_can_queue = -1;
113 module_param(setup_can_queue, int, 0);
114 static int setup_cmd_per_lun = -1;
115 module_param(setup_cmd_per_lun, int, 0);
116 static int setup_sg_tablesize = -1;
117 module_param(setup_sg_tablesize, int, 0);
118 #ifdef SUPPORT_TAGS
119 static int setup_use_tagged_queuing = -1;
120 module_param(setup_use_tagged_queuing, int, 0);
121 #endif
122 static int setup_hostid = -1;
123 module_param(setup_hostid, int, 0);
124
125 static struct scsi_cmnd *sun3_dma_setup_done = NULL;
126
127 #define AFTER_RESET_DELAY       (HZ/2)
128
129 /* ms to wait after hitting dma regs */
130 #define SUN3_DMA_DELAY 10
131
132 /* dvma buffer to allocate -- 32k should hopefully be more than sufficient */
133 #define SUN3_DVMA_BUFSIZE 0xe000
134
135 /* minimum number of bytes to do dma on */
136 #define SUN3_DMA_MINSIZE 128
137
138 static volatile unsigned char *sun3_scsi_regp;
139 static volatile struct sun3_dma_regs *dregs;
140 #ifdef OLDDMA
141 static unsigned char *dmabuf = NULL; /* dma memory buffer */
142 #endif
143 static struct sun3_udc_regs *udc_regs = NULL;
144 static unsigned char *sun3_dma_orig_addr = NULL;
145 static unsigned long sun3_dma_orig_count = 0;
146 static int sun3_dma_active = 0;
147 static unsigned long last_residual = 0;
148
149 /*
150  * NCR 5380 register access functions
151  */
152
153 static inline unsigned char sun3scsi_read(int reg)
154 {
155         return( sun3_scsi_regp[reg] );
156 }
157
158 static inline void sun3scsi_write(int reg, int value)
159 {
160         sun3_scsi_regp[reg] = value;
161 }
162
163 /* dma controller register access functions */
164
165 static inline unsigned short sun3_udc_read(unsigned char reg)
166 {
167         unsigned short ret;
168
169         dregs->udc_addr = UDC_CSR;
170         udelay(SUN3_DMA_DELAY);
171         ret = dregs->udc_data;
172         udelay(SUN3_DMA_DELAY);
173         
174         return ret;
175 }
176
177 static inline void sun3_udc_write(unsigned short val, unsigned char reg)
178 {
179         dregs->udc_addr = reg;
180         udelay(SUN3_DMA_DELAY);
181         dregs->udc_data = val;
182         udelay(SUN3_DMA_DELAY);
183 }
184
185 /*
186  * XXX: status debug
187  */
188 static struct Scsi_Host *default_instance;
189
190 /*
191  * Function : int sun3scsi_detect(struct scsi_host_template * tpnt)
192  *
193  * Purpose : initializes mac NCR5380 driver based on the
194  *      command line / compile time port and irq definitions.
195  *
196  * Inputs : tpnt - template for this SCSI adapter.
197  *
198  * Returns : 1 if a host adapter was found, 0 if not.
199  *
200  */
201  
202 int __init sun3scsi_detect(struct scsi_host_template * tpnt)
203 {
204         unsigned long ioaddr;
205         static int called = 0;
206         struct Scsi_Host *instance;
207
208         /* check that this machine has an onboard 5380 */
209         switch(idprom->id_machtype) {
210         case SM_SUN3|SM_3_50:
211         case SM_SUN3|SM_3_60:
212                 break;
213
214         default:
215                 return 0;
216         }
217
218         if(called)
219                 return 0;
220
221         tpnt->proc_name = "Sun3 5380 SCSI";
222
223         /* setup variables */
224         tpnt->can_queue =
225                 (setup_can_queue > 0) ? setup_can_queue : CAN_QUEUE;
226         tpnt->cmd_per_lun =
227                 (setup_cmd_per_lun > 0) ? setup_cmd_per_lun : CMD_PER_LUN;
228         tpnt->sg_tablesize = 
229                 (setup_sg_tablesize >= 0) ? setup_sg_tablesize : SG_TABLESIZE;
230
231         if (setup_hostid >= 0)
232                 tpnt->this_id = setup_hostid;
233         else {
234                 /* use 7 as default */
235                 tpnt->this_id = 7;
236         }
237
238         ioaddr = (unsigned long)ioremap(IOBASE_SUN3_SCSI, PAGE_SIZE);
239         sun3_scsi_regp = (unsigned char *)ioaddr;
240
241         dregs = (struct sun3_dma_regs *)(((unsigned char *)ioaddr) + 8);
242
243         if((udc_regs = dvma_malloc(sizeof(struct sun3_udc_regs)))
244            == NULL) {
245              printk("SUN3 Scsi couldn't allocate DVMA memory!\n");
246              return 0;
247         }
248 #ifdef OLDDMA
249         if((dmabuf = dvma_malloc_align(SUN3_DVMA_BUFSIZE, 0x10000)) == NULL) {
250              printk("SUN3 Scsi couldn't allocate DVMA memory!\n");
251              return 0;
252         }
253 #endif
254 #ifdef SUPPORT_TAGS
255         if (setup_use_tagged_queuing < 0)
256                 setup_use_tagged_queuing = USE_TAGGED_QUEUING;
257 #endif
258
259         instance = scsi_register (tpnt, sizeof(struct NCR5380_hostdata));
260         if(instance == NULL)
261                 return 0;
262                 
263         default_instance = instance;
264
265         instance->io_port = (unsigned long) ioaddr;
266         instance->irq = IRQ_SUN3_SCSI;
267
268         NCR5380_init(instance, 0);
269
270         instance->n_io_port = 32;
271
272         ((struct NCR5380_hostdata *)instance->hostdata)->ctrl = 0;
273
274         if (request_irq(instance->irq, scsi_sun3_intr,
275                              0, "Sun3SCSI-5380", instance)) {
276 #ifndef REAL_DMA
277                 printk("scsi%d: IRQ%d not free, interrupts disabled\n",
278                        instance->host_no, instance->irq);
279                 instance->irq = SCSI_IRQ_NONE;
280 #else
281                 printk("scsi%d: IRQ%d not free, bailing out\n",
282                        instance->host_no, instance->irq);
283                 return 0;
284 #endif
285         }
286         
287         printk("scsi%d: Sun3 5380 at port %lX irq", instance->host_no, instance->io_port);
288         if (instance->irq == SCSI_IRQ_NONE)
289                 printk ("s disabled");
290         else
291                 printk (" %d", instance->irq);
292         printk(" options CAN_QUEUE=%d CMD_PER_LUN=%d release=%d",
293                instance->can_queue, instance->cmd_per_lun,
294                SUN3SCSI_PUBLIC_RELEASE);
295         printk("\nscsi%d:", instance->host_no);
296         NCR5380_print_options(instance);
297         printk("\n");
298
299         dregs->csr = 0;
300         udelay(SUN3_DMA_DELAY);
301         dregs->csr = CSR_SCSI | CSR_FIFO | CSR_INTR;
302         udelay(SUN3_DMA_DELAY);
303         dregs->fifo_count = 0;
304
305         called = 1;
306
307 #ifdef RESET_BOOT
308         sun3_scsi_reset_boot(instance);
309 #endif
310
311         return 1;
312 }
313
314 int sun3scsi_release (struct Scsi_Host *shpnt)
315 {
316         if (shpnt->irq != SCSI_IRQ_NONE)
317                 free_irq(shpnt->irq, shpnt);
318
319         iounmap((void *)sun3_scsi_regp);
320
321         NCR5380_exit(shpnt);
322         return 0;
323 }
324
325 #ifdef RESET_BOOT
326 /*
327  * Our 'bus reset on boot' function
328  */
329
330 static void sun3_scsi_reset_boot(struct Scsi_Host *instance)
331 {
332         unsigned long end;
333
334         NCR5380_local_declare();
335         NCR5380_setup(instance);
336         
337         /*
338          * Do a SCSI reset to clean up the bus during initialization. No
339          * messing with the queues, interrupts, or locks necessary here.
340          */
341
342         printk( "Sun3 SCSI: resetting the SCSI bus..." );
343
344         /* switch off SCSI IRQ - catch an interrupt without IRQ bit set else */
345 //              sun3_disable_irq( IRQ_SUN3_SCSI );
346
347         /* get in phase */
348         NCR5380_write( TARGET_COMMAND_REG,
349                       PHASE_SR_TO_TCR( NCR5380_read(STATUS_REG) ));
350
351         /* assert RST */
352         NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE | ICR_ASSERT_RST );
353
354         /* The min. reset hold time is 25us, so 40us should be enough */
355         udelay( 50 );
356
357         /* reset RST and interrupt */
358         NCR5380_write( INITIATOR_COMMAND_REG, ICR_BASE );
359         NCR5380_read( RESET_PARITY_INTERRUPT_REG );
360
361         for( end = jiffies + AFTER_RESET_DELAY; time_before(jiffies, end); )
362                 barrier();
363
364         /* switch on SCSI IRQ again */
365 //              sun3_enable_irq( IRQ_SUN3_SCSI );
366
367         printk( " done\n" );
368 }
369 #endif
370
371 const char * sun3scsi_info (struct Scsi_Host *spnt) {
372     return "";
373 }
374
375 // safe bits for the CSR
376 #define CSR_GOOD 0x060f
377
378 static irqreturn_t scsi_sun3_intr(int irq, void *dummy)
379 {
380         unsigned short csr = dregs->csr;
381         int handled = 0;
382
383         if(csr & ~CSR_GOOD) {
384                 if(csr & CSR_DMA_BUSERR) {
385                         printk("scsi%d: bus error in dma\n", default_instance->host_no);
386                 }
387
388                 if(csr & CSR_DMA_CONFLICT) {
389                         printk("scsi%d: dma conflict\n", default_instance->host_no);
390                 }
391                 handled = 1;
392         }
393
394         if(csr & (CSR_SDB_INT | CSR_DMA_INT)) {
395                 NCR5380_intr(irq, dummy);
396                 handled = 1;
397         }
398
399         return IRQ_RETVAL(handled);
400 }
401
402 /*
403  * Debug stuff - to be called on NMI, or sysrq key. Use at your own risk; 
404  * reentering NCR5380_print_status seems to have ugly side effects
405  */
406
407 /* this doesn't seem to get used at all -- sam */
408 #if 0
409 void sun3_sun3_debug (void)
410 {
411         unsigned long flags;
412         NCR5380_local_declare();
413
414         if (default_instance) {
415                         local_irq_save(flags);
416                         NCR5380_print_status(default_instance);
417                         local_irq_restore(flags);
418         }
419 }
420 #endif
421
422
423 /* sun3scsi_dma_setup() -- initialize the dma controller for a read/write */
424 static unsigned long sun3scsi_dma_setup(void *data, unsigned long count, int write_flag)
425 {
426 #ifdef OLDDMA
427         if(write_flag) 
428                 memcpy(dmabuf, data, count);
429         else {
430                 sun3_dma_orig_addr = data;
431                 sun3_dma_orig_count = count;
432         }
433 #else
434         void *addr;
435
436         if(sun3_dma_orig_addr != NULL)
437                 dvma_unmap(sun3_dma_orig_addr);
438
439 //      addr = sun3_dvma_page((unsigned long)data, (unsigned long)dmabuf);
440         addr = (void *)dvma_map((unsigned long) data, count);
441                 
442         sun3_dma_orig_addr = addr;
443         sun3_dma_orig_count = count;
444 #endif
445         dregs->fifo_count = 0;
446         sun3_udc_write(UDC_RESET, UDC_CSR);
447         
448         /* reset fifo */
449         dregs->csr &= ~CSR_FIFO;
450         dregs->csr |= CSR_FIFO;
451         
452         /* set direction */
453         if(write_flag)
454                 dregs->csr |= CSR_SEND;
455         else
456                 dregs->csr &= ~CSR_SEND;
457         
458         /* byte count for fifo */
459         dregs->fifo_count = count;
460
461         sun3_udc_write(UDC_RESET, UDC_CSR);
462         
463         /* reset fifo */
464         dregs->csr &= ~CSR_FIFO;
465         dregs->csr |= CSR_FIFO;
466         
467         if(dregs->fifo_count != count) { 
468                 printk("scsi%d: fifo_mismatch %04x not %04x\n",
469                        default_instance->host_no, dregs->fifo_count,
470                        (unsigned int) count);
471                 NCR5380_print(default_instance);
472         }
473
474         /* setup udc */
475 #ifdef OLDDMA
476         udc_regs->addr_hi = ((dvma_vtob(dmabuf) & 0xff0000) >> 8);
477         udc_regs->addr_lo = (dvma_vtob(dmabuf) & 0xffff);
478 #else
479         udc_regs->addr_hi = (((unsigned long)(addr) & 0xff0000) >> 8);
480         udc_regs->addr_lo = ((unsigned long)(addr) & 0xffff);
481 #endif
482         udc_regs->count = count/2; /* count in words */
483         udc_regs->mode_hi = UDC_MODE_HIWORD;
484         if(write_flag) {
485                 if(count & 1)
486                         udc_regs->count++;
487                 udc_regs->mode_lo = UDC_MODE_LSEND;
488                 udc_regs->rsel = UDC_RSEL_SEND;
489         } else {
490                 udc_regs->mode_lo = UDC_MODE_LRECV;
491                 udc_regs->rsel = UDC_RSEL_RECV;
492         }
493         
494         /* announce location of regs block */
495         sun3_udc_write(((dvma_vtob(udc_regs) & 0xff0000) >> 8),
496                        UDC_CHN_HI); 
497
498         sun3_udc_write((dvma_vtob(udc_regs) & 0xffff), UDC_CHN_LO);
499
500         /* set dma master on */
501         sun3_udc_write(0xd, UDC_MODE);
502
503         /* interrupt enable */
504         sun3_udc_write(UDC_INT_ENABLE, UDC_CSR);
505         
506         return count;
507
508 }
509
510 static inline unsigned long sun3scsi_dma_count(struct Scsi_Host *instance)
511 {
512         unsigned short resid;
513
514         dregs->udc_addr = 0x32; 
515         udelay(SUN3_DMA_DELAY);
516         resid = dregs->udc_data;
517         udelay(SUN3_DMA_DELAY);
518         resid *= 2;
519
520         return (unsigned long) resid;
521 }
522
523 static inline unsigned long sun3scsi_dma_residual(struct Scsi_Host *instance)
524 {
525         return last_residual;
526 }
527
528 static inline unsigned long sun3scsi_dma_xfer_len(unsigned long wanted,
529                                                   struct scsi_cmnd *cmd,
530                                                   int write_flag)
531 {
532         if (cmd->request->cmd_type == REQ_TYPE_FS)
533                 return wanted;
534         else
535                 return 0;
536 }
537
538 static inline int sun3scsi_dma_start(unsigned long count, unsigned char *data)
539 {
540
541     sun3_udc_write(UDC_CHN_START, UDC_CSR);
542     
543     return 0;
544 }
545
546 /* clean up after our dma is done */
547 static int sun3scsi_dma_finish(int write_flag)
548 {
549         unsigned short count;
550         unsigned short fifo;
551         int ret = 0;
552         
553         sun3_dma_active = 0;
554 #if 1
555         // check to empty the fifo on a read
556         if(!write_flag) {
557                 int tmo = 20000; /* .2 sec */
558                 
559                 while(1) {
560                         if(dregs->csr & CSR_FIFO_EMPTY)
561                                 break;
562
563                         if(--tmo <= 0) {
564                                 printk("sun3scsi: fifo failed to empty!\n");
565                                 return 1;
566                         }
567                         udelay(10);
568                 }
569         }
570                 
571 #endif
572
573         count = sun3scsi_dma_count(default_instance);
574 #ifdef OLDDMA
575
576         /* if we've finished a read, copy out the data we read */
577         if(sun3_dma_orig_addr) {
578                 /* check for residual bytes after dma end */
579                 if(count && (NCR5380_read(BUS_AND_STATUS_REG) &
580                              (BASR_PHASE_MATCH | BASR_ACK))) {
581                         printk("scsi%d: sun3_scsi_finish: read overrun baby... ", default_instance->host_no);
582                         printk("basr now %02x\n", NCR5380_read(BUS_AND_STATUS_REG));
583                         ret = count;
584                 }
585                 
586                 /* copy in what we dma'd no matter what */
587                 memcpy(sun3_dma_orig_addr, dmabuf, sun3_dma_orig_count);
588                 sun3_dma_orig_addr = NULL;
589
590         }
591 #else
592
593         fifo = dregs->fifo_count;
594         last_residual = fifo;
595
596         /* empty bytes from the fifo which didn't make it */
597         if((!write_flag) && (count - fifo) == 2) {
598                 unsigned short data;
599                 unsigned char *vaddr;
600
601                 data = dregs->fifo_data;
602                 vaddr = (unsigned char *)dvma_btov(sun3_dma_orig_addr);
603                 
604                 vaddr += (sun3_dma_orig_count - fifo);
605
606                 vaddr[-2] = (data & 0xff00) >> 8;
607                 vaddr[-1] = (data & 0xff);
608         }
609
610         dvma_unmap(sun3_dma_orig_addr);
611         sun3_dma_orig_addr = NULL;
612 #endif
613         sun3_udc_write(UDC_RESET, UDC_CSR);
614         dregs->fifo_count = 0;
615         dregs->csr &= ~CSR_SEND;
616
617         /* reset fifo */
618         dregs->csr &= ~CSR_FIFO;
619         dregs->csr |= CSR_FIFO;
620         
621         sun3_dma_setup_done = NULL;
622
623         return ret;
624
625 }
626         
627 #include "sun3_NCR5380.c"
628
629 static struct scsi_host_template driver_template = {
630         .name                   = SUN3_SCSI_NAME,
631         .detect                 = sun3scsi_detect,
632         .release                = sun3scsi_release,
633         .info                   = sun3scsi_info,
634         .queuecommand           = sun3scsi_queue_command,
635         .eh_abort_handler       = sun3scsi_abort,
636         .eh_bus_reset_handler   = sun3scsi_bus_reset,
637         .can_queue              = CAN_QUEUE,
638         .this_id                = 7,
639         .sg_tablesize           = SG_TABLESIZE,
640         .cmd_per_lun            = CMD_PER_LUN,
641         .use_clustering         = DISABLE_CLUSTERING
642 };
643
644
645 #include "scsi_module.c"
646
647 MODULE_LICENSE("GPL");