This source file includes following definitions.
- read_timer
- hd_setup
- dump_status
- check_status
- controller_busy
- status_ok
- controller_ready
- hd_out
- fixstring
- identify_intr
- set_multmode_intr
- drive_busy
- reset_controller
- reset_hd
- unexpected_hd_interrupt
- bad_rw_intr
- wait_DRQ
- read_intr
- multwrite
- multwrite_intr
- write_intr
- recal_intr
- hd_times_out
- do_special_op
- hd_request
- do_hd_request
- hd_ioctl
- hd_open
- hd_release
- hd_interrupt
- hd_geninit
- hd_init
- revalidate_hddisk
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21
22 #define DEFAULT_MULT_COUNT 0
23 #define DEFAULT_UNMASK_INTR 0
24
25 #include <asm/irq.h>
26 #include <linux/errno.h>
27 #include <linux/signal.h>
28 #include <linux/sched.h>
29 #include <linux/timer.h>
30 #include <linux/fs.h>
31 #include <linux/kernel.h>
32 #include <linux/hdreg.h>
33 #include <linux/genhd.h>
34 #include <linux/malloc.h>
35 #include <linux/string.h>
36 #include <linux/ioport.h>
37 #include <linux/mc146818rtc.h>
38
39 #define REALLY_SLOW_IO
40 #include <asm/system.h>
41 #include <asm/io.h>
42 #include <asm/segment.h>
43
44 #define MAJOR_NR HD_MAJOR
45 #include "blk.h"
46
47 static int revalidate_hddisk(int, int);
48
49 #define HD_DELAY 0
50
51 #define MAX_ERRORS 16
52 #define RESET_FREQ 8
53 #define RECAL_FREQ 4
54 #define MAX_HD 2
55
56 #define STAT_OK (READY_STAT|SEEK_STAT)
57 #define OK_STATUS(s) (((s)&(STAT_OK|(BUSY_STAT|WRERR_STAT|ERR_STAT)))==STAT_OK)
58
59 static void recal_intr(void);
60 static void bad_rw_intr(void);
61
62 static char recalibrate[MAX_HD] = { 0, };
63 static char special_op[MAX_HD] = { 0, };
64 static int access_count[MAX_HD] = {0, };
65 static char busy[MAX_HD] = {0, };
66 static struct wait_queue * busy_wait = NULL;
67
68 static int reset = 0;
69 static int hd_error = 0;
70
71
72
73
74 struct hd_i_struct {
75 unsigned int head,sect,cyl,wpcom,lzone,ctl;
76 };
77 static struct hd_driveid *hd_ident_info[MAX_HD] = {0, };
78
79 #ifdef HD_TYPE
80 static struct hd_i_struct hd_info[] = { HD_TYPE };
81 struct hd_i_struct bios_info[] = { HD_TYPE };
82 static int NR_HD = ((sizeof (hd_info))/(sizeof (struct hd_i_struct)));
83 #else
84 static struct hd_i_struct hd_info[] = { {0,0,0,0,0,0},{0,0,0,0,0,0} };
85 struct hd_i_struct bios_info[] = { {0,0,0,0,0,0},{0,0,0,0,0,0} };
86 static int NR_HD = 0;
87 #endif
88
89 static struct hd_struct hd[MAX_HD<<6]={{0,0},};
90 static int hd_sizes[MAX_HD<<6] = {0, };
91 static int hd_blocksizes[MAX_HD<<6] = {0, };
92
93 #if (HD_DELAY > 0)
94 unsigned long last_req;
95
96 unsigned long read_timer(void)
97 {
98 unsigned long t, flags;
99 int i;
100
101 save_flags(flags);
102 cli();
103 t = jiffies * 11932;
104 outb_p(0, 0x43);
105 i = inb_p(0x40);
106 i |= inb(0x40) << 8;
107 restore_flags(flags);
108 return(t - i);
109 }
110 #endif
111
112 void hd_setup(char *str, int *ints)
113 {
114 int hdind = 0;
115
116 if (ints[0] != 3)
117 return;
118 if (bios_info[0].head != 0)
119 hdind=1;
120 bios_info[hdind].head = hd_info[hdind].head = ints[2];
121 bios_info[hdind].sect = hd_info[hdind].sect = ints[3];
122 bios_info[hdind].cyl = hd_info[hdind].cyl = ints[1];
123 bios_info[hdind].wpcom = hd_info[hdind].wpcom = 0;
124 bios_info[hdind].lzone = hd_info[hdind].lzone = ints[1];
125 bios_info[hdind].ctl = hd_info[hdind].ctl = (ints[2] > 8 ? 8 : 0);
126 NR_HD = hdind+1;
127 }
128
129 static void dump_status (const char *msg, unsigned int stat)
130 {
131 unsigned long flags;
132 char devc;
133
134 devc = CURRENT ? 'a' + DEVICE_NR(CURRENT->dev) : '?';
135 save_flags (flags);
136 sti();
137 printk("hd%c: %s: status=0x%02x { ", devc, msg, stat & 0xff);
138 if (stat & BUSY_STAT) printk("Busy ");
139 if (stat & READY_STAT) printk("DriveReady ");
140 if (stat & WRERR_STAT) printk("WriteFault ");
141 if (stat & SEEK_STAT) printk("SeekComplete ");
142 if (stat & DRQ_STAT) printk("DataRequest ");
143 if (stat & ECC_STAT) printk("CorrectedError ");
144 if (stat & INDEX_STAT) printk("Index ");
145 if (stat & ERR_STAT) printk("Error ");
146 printk("}\n");
147 if ((stat & ERR_STAT) == 0) {
148 hd_error = 0;
149 } else {
150 hd_error = inb(HD_ERROR);
151 printk("hd%c: %s: error=0x%02x { ", devc, msg, hd_error & 0xff);
152 if (hd_error & BBD_ERR) printk("BadSector ");
153 if (hd_error & ECC_ERR) printk("UncorrectableError ");
154 if (hd_error & ID_ERR) printk("SectorIdNotFound ");
155 if (hd_error & ABRT_ERR) printk("DriveStatusError ");
156 if (hd_error & TRK0_ERR) printk("TrackZeroNotFound ");
157 if (hd_error & MARK_ERR) printk("AddrMarkNotFound ");
158 printk("}");
159 if (hd_error & (BBD_ERR|ECC_ERR|ID_ERR|MARK_ERR)) {
160 printk(", CHS=%d/%d/%d", (inb(HD_HCYL)<<8) + inb(HD_LCYL),
161 inb(HD_CURRENT) & 0xf, inb(HD_SECTOR));
162 if (CURRENT)
163 printk(", sector=%ld", CURRENT->sector);
164 }
165 printk("\n");
166 }
167 restore_flags (flags);
168 }
169
170 void check_status(void)
171 {
172 int i = inb_p(HD_STATUS);
173
174 if (!OK_STATUS(i)) {
175 dump_status("check_status", i);
176 bad_rw_intr();
177 }
178 }
179
180 static int controller_busy(void)
181 {
182 int retries = 100000;
183 unsigned char status;
184
185 do {
186 status = inb_p(HD_STATUS);
187 } while ((status & BUSY_STAT) && --retries);
188 return status;
189 }
190
191 static int status_ok(void)
192 {
193 unsigned char status = inb_p(HD_STATUS);
194
195 if (status & BUSY_STAT)
196 return 1;
197 if (status & WRERR_STAT)
198 return 0;
199 if (!(status & READY_STAT))
200 return 0;
201 if (!(status & SEEK_STAT))
202 return 0;
203 return 1;
204 }
205
206 static int controller_ready(unsigned int drive, unsigned int head)
207 {
208 int retry = 100;
209
210 do {
211 if (controller_busy() & BUSY_STAT)
212 return 0;
213 outb_p(0xA0 | (drive<<4) | head, HD_CURRENT);
214 if (status_ok())
215 return 1;
216 } while (--retry);
217 return 0;
218 }
219
220 static void hd_out(unsigned int drive,unsigned int nsect,unsigned int sect,
221 unsigned int head,unsigned int cyl,unsigned int cmd,
222 void (*intr_addr)(void))
223 {
224 unsigned short port;
225
226 #if (HD_DELAY > 0)
227 while (read_timer() - last_req < HD_DELAY)
228 ;
229 #endif
230 if (reset)
231 return;
232 if (!controller_ready(drive, head)) {
233 reset = 1;
234 return;
235 }
236 SET_INTR(intr_addr);
237 outb_p(hd_info[drive].ctl,HD_CMD);
238 port=HD_DATA;
239 outb_p(hd_info[drive].wpcom>>2,++port);
240 outb_p(nsect,++port);
241 outb_p(sect,++port);
242 outb_p(cyl,++port);
243 outb_p(cyl>>8,++port);
244 outb_p(0xA0|(drive<<4)|head,++port);
245 outb_p(cmd,++port);
246 }
247
248 static void hd_request (void);
249 static unsigned int identified [MAX_HD] = {0,};
250 static unsigned int unmask_intr [MAX_HD] = {0,};
251 static unsigned int max_mult [MAX_HD] = {0,};
252 static unsigned int mult_req [MAX_HD] = {0,};
253 static unsigned int mult_count [MAX_HD] = {0,};
254 static struct request WCURRENT;
255
256 static void fixstring (unsigned char *s, int bytecount)
257 {
258 unsigned char *p, *end = &s[bytecount &= ~1];
259
260
261 for (p = end ; p != s;) {
262 unsigned short *pp = (unsigned short *) (p -= 2);
263 *pp = (*pp >> 8) | (*pp << 8);
264 }
265
266
267 while (s != end && *s == ' ')
268 ++s;
269
270
271 while (s != end && *s) {
272 if (*s++ != ' ' || (s != end && *s && *s != ' '))
273 *p++ = *(s-1);
274 }
275
276
277 while (p != end)
278 *p++ = '\0';
279 }
280
281 static void identify_intr(void)
282 {
283 unsigned int dev = DEVICE_NR(CURRENT->dev);
284 unsigned short stat = inb_p(HD_STATUS);
285 struct hd_driveid *id = hd_ident_info[dev];
286
287 if (unmask_intr[dev])
288 sti();
289 if (stat & (BUSY_STAT|ERR_STAT)) {
290 printk (" hd%c: non-IDE device, %dMB, CHS=%d/%d/%d\n", dev+'a',
291 hd_info[dev].cyl*hd_info[dev].head*hd_info[dev].sect / 2048,
292 hd_info[dev].cyl, hd_info[dev].head, hd_info[dev].sect);
293 if (id != NULL) {
294 hd_ident_info[dev] = NULL;
295 kfree_s (id, 512);
296 }
297 } else {
298 insw(HD_DATA, id, 256);
299 max_mult[dev] = id->max_multsect;
300 if ((id->field_valid&1) && id->cur_cyls && id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
301
302
303
304
305
306
307
308 hd_info[dev].cyl = id->cur_cyls;
309 hd_info[dev].head = id->cur_heads;
310 hd_info[dev].sect = id->cur_sectors;
311 }
312 fixstring (id->serial_no, sizeof(id->serial_no));
313 fixstring (id->fw_rev, sizeof(id->fw_rev));
314 fixstring (id->model, sizeof(id->model));
315 printk (" hd%c: %.40s, %dMB w/%dKB Cache, CHS=%d/%d/%d, MaxMult=%d\n",
316 dev+'a', id->model, id->cyls*id->heads*id->sectors/2048,
317 id->buf_size/2, bios_info[dev].cyl, bios_info[dev].head,
318 bios_info[dev].sect, id->max_multsect);
319
320
321
322
323
324 if (!strncmp(id->model, "QUANTUM", 7))
325 special_op[dev] = recalibrate[dev] = 1;
326 }
327 #if (HD_DELAY > 0)
328 last_req = read_timer();
329 #endif
330 hd_request();
331 return;
332 }
333
334 static void set_multmode_intr(void)
335 {
336 unsigned int dev = DEVICE_NR(CURRENT->dev), stat = inb_p(HD_STATUS);
337
338 if (unmask_intr[dev])
339 sti();
340 if (stat & (BUSY_STAT|ERR_STAT)) {
341 mult_req[dev] = mult_count[dev] = 0;
342 dump_status("set multmode failed", stat);
343 } else {
344 if ((mult_count[dev] = mult_req[dev]))
345 printk (" hd%c: enabled %d-sector multiple mode\n",
346 dev+'a', mult_count[dev]);
347 else
348 printk (" hd%c: disabled multiple mode\n", dev+'a');
349 }
350 #if (HD_DELAY > 0)
351 last_req = read_timer();
352 #endif
353 hd_request();
354 return;
355 }
356
357 static int drive_busy(void)
358 {
359 unsigned int i;
360 unsigned char c;
361
362 for (i = 0; i < 500000 ; i++) {
363 c = inb_p(HD_STATUS);
364 if ((c & (BUSY_STAT | READY_STAT | SEEK_STAT)) == STAT_OK)
365 return 0;
366 }
367 dump_status("reset timed out", c);
368 return 1;
369 }
370
371 static void reset_controller(void)
372 {
373 int i;
374
375 outb_p(4,HD_CMD);
376 for(i = 0; i < 1000; i++) barrier();
377 outb_p(hd_info[0].ctl & 0x0f,HD_CMD);
378 for(i = 0; i < 1000; i++) barrier();
379 if (drive_busy())
380 printk("hd: controller still busy\n");
381 else if ((hd_error = inb(HD_ERROR)) != 1)
382 printk("hd: controller reset failed: %02x\n",hd_error);
383 }
384
385 static void reset_hd(void)
386 {
387 static int i;
388
389 repeat:
390 if (reset) {
391 reset = 0;
392 i = -1;
393 reset_controller();
394 } else {
395 check_status();
396 if (reset)
397 goto repeat;
398 }
399 if (++i < NR_HD) {
400 special_op[i] = recalibrate[i] = 1;
401 if (unmask_intr[i]) {
402 unmask_intr[i] = DEFAULT_UNMASK_INTR;
403 printk("hd%c: reset irq-unmasking to %d\n",i+'a',
404 DEFAULT_UNMASK_INTR);
405 }
406 if (mult_req[i] || mult_count[i]) {
407 mult_count[i] = 0;
408 mult_req[i] = DEFAULT_MULT_COUNT;
409 printk("hd%c: reset multiple mode to %d\n",i+'a',
410 DEFAULT_MULT_COUNT);
411 }
412 hd_out(i,hd_info[i].sect,hd_info[i].sect,hd_info[i].head-1,
413 hd_info[i].cyl,WIN_SPECIFY,&reset_hd);
414 if (reset)
415 goto repeat;
416 } else
417 hd_request();
418 }
419
420
421
422
423
424
425
426
427
428
429 void unexpected_hd_interrupt(void)
430 {
431 unsigned int stat = inb_p(HD_STATUS);
432
433 if (stat & (BUSY_STAT|DRQ_STAT|ECC_STAT|ERR_STAT)) {
434 dump_status ("unexpected interrupt", stat);
435 SET_TIMER;
436 }
437 }
438
439
440
441
442
443
444 static void bad_rw_intr(void)
445 {
446 int dev;
447
448 if (!CURRENT)
449 return;
450 dev = DEVICE_NR(CURRENT->dev);
451 if (++CURRENT->errors >= MAX_ERRORS || (hd_error & BBD_ERR)) {
452 end_request(0);
453 special_op[dev] = recalibrate[dev] = 1;
454 } else if (CURRENT->errors % RESET_FREQ == 0)
455 reset = 1;
456 else if ((hd_error & TRK0_ERR) || CURRENT->errors % RECAL_FREQ == 0)
457 special_op[dev] = recalibrate[dev] = 1;
458
459 }
460
461 static inline int wait_DRQ(void)
462 {
463 int retries = 100000, stat;
464
465 while (--retries > 0)
466 if ((stat = inb_p(HD_STATUS)) & DRQ_STAT)
467 return 0;
468 dump_status("wait_DRQ", stat);
469 return -1;
470 }
471
472 static void read_intr(void)
473 {
474 unsigned int dev = DEVICE_NR(CURRENT->dev);
475 int i, retries = 100000, msect = mult_count[dev], nsect;
476
477 if (unmask_intr[dev])
478 sti();
479 do {
480 i = (unsigned) inb_p(HD_STATUS);
481 if (i & BUSY_STAT)
482 continue;
483 if (!OK_STATUS(i))
484 break;
485 if (i & DRQ_STAT)
486 goto ok_to_read;
487 } while (--retries > 0);
488 dump_status("read_intr", i);
489 bad_rw_intr();
490 hd_request();
491 return;
492 ok_to_read:
493 if (msect) {
494 if ((nsect = CURRENT->current_nr_sectors) > msect)
495 nsect = msect;
496 msect -= nsect;
497 } else
498 nsect = 1;
499 insw(HD_DATA,CURRENT->buffer,nsect<<8);
500 CURRENT->sector += nsect;
501 CURRENT->buffer += nsect<<9;
502 CURRENT->errors = 0;
503 i = (CURRENT->nr_sectors -= nsect);
504
505 #ifdef DEBUG
506 printk("hd%c: read: sectors(%ld-%ld), remaining=%ld, buffer=0x%08lx\n",
507 dev+'a', CURRENT->sector, CURRENT->sector+nsect,
508 CURRENT->nr_sectors, (unsigned long) CURRENT->buffer+(nsect<<9));
509 #endif
510 if ((CURRENT->current_nr_sectors -= nsect) <= 0)
511 end_request(1);
512 if (i > 0) {
513 if (msect)
514 goto ok_to_read;
515 SET_INTR(&read_intr);
516 return;
517 }
518 (void) inb_p(HD_STATUS);
519 #if (HD_DELAY > 0)
520 last_req = read_timer();
521 #endif
522 if (CURRENT)
523 hd_request();
524 return;
525 }
526
527 static inline void multwrite (unsigned int dev)
528 {
529 unsigned int mcount = mult_count[dev];
530
531 while (mcount--) {
532 outsw(HD_DATA,WCURRENT.buffer,256);
533 if (!--WCURRENT.nr_sectors)
534 return;
535 WCURRENT.buffer += 512;
536 if (!--WCURRENT.current_nr_sectors) {
537 WCURRENT.bh = WCURRENT.bh->b_reqnext;
538 if (WCURRENT.bh == NULL)
539 panic("buffer list corrupted\n");
540 WCURRENT.current_nr_sectors = WCURRENT.bh->b_size>>9;
541 WCURRENT.buffer = WCURRENT.bh->b_data;
542 }
543 }
544 }
545
546 static void multwrite_intr(void)
547 {
548 int i;
549 unsigned int dev = DEVICE_NR(WCURRENT.dev);
550
551 if (unmask_intr[dev])
552 sti();
553 if (OK_STATUS(i=inb_p(HD_STATUS))) {
554 if (i & DRQ_STAT) {
555 if (WCURRENT.nr_sectors) {
556 multwrite(dev);
557 SET_INTR(&multwrite_intr);
558 return;
559 }
560 } else {
561 if (!WCURRENT.nr_sectors) {
562 for (i = CURRENT->nr_sectors; i > 0;){
563 i -= CURRENT->current_nr_sectors;
564 end_request(1);
565 }
566 #if (HD_DELAY > 0)
567 last_req = read_timer();
568 #endif
569 if (CURRENT)
570 hd_request();
571 return;
572 }
573 }
574 }
575 dump_status("multwrite_intr", i);
576 bad_rw_intr();
577 hd_request();
578 }
579
580 static void write_intr(void)
581 {
582 int i;
583 int retries = 100000;
584
585 if (unmask_intr[DEVICE_NR(WCURRENT.dev)])
586 sti();
587 do {
588 i = (unsigned) inb_p(HD_STATUS);
589 if (i & BUSY_STAT)
590 continue;
591 if (!OK_STATUS(i))
592 break;
593 if ((CURRENT->nr_sectors <= 1) || (i & DRQ_STAT))
594 goto ok_to_write;
595 } while (--retries > 0);
596 dump_status("write_intr", i);
597 bad_rw_intr();
598 hd_request();
599 return;
600 ok_to_write:
601 CURRENT->sector++;
602 i = --CURRENT->nr_sectors;
603 --CURRENT->current_nr_sectors;
604 CURRENT->buffer += 512;
605 if (!i || (CURRENT->bh && !SUBSECTOR(i)))
606 end_request(1);
607 if (i > 0) {
608 SET_INTR(&write_intr);
609 outsw(HD_DATA,CURRENT->buffer,256);
610 sti();
611 } else {
612 #if (HD_DELAY > 0)
613 last_req = read_timer();
614 #endif
615 hd_request();
616 }
617 return;
618 }
619
620 static void recal_intr(void)
621 {
622 check_status();
623 #if (HD_DELAY > 0)
624 last_req = read_timer();
625 #endif
626 hd_request();
627 }
628
629
630
631
632
633 static void hd_times_out(void)
634 {
635 unsigned int dev;
636
637 DEVICE_INTR = NULL;
638 if (!CURRENT)
639 return;
640 disable_irq(HD_IRQ);
641 sti();
642 reset = 1;
643 dev = DEVICE_NR(CURRENT->dev);
644 printk("hd%c: timeout\n", dev+'a');
645 if (++CURRENT->errors >= MAX_ERRORS) {
646 #ifdef DEBUG
647 printk("hd%c: too many errors\n", dev+'a');
648 #endif
649 end_request(0);
650 }
651 cli();
652 hd_request();
653 enable_irq(HD_IRQ);
654 }
655
656 int do_special_op (unsigned int dev)
657 {
658 if (recalibrate[dev]) {
659 recalibrate[dev] = 0;
660 hd_out(dev,hd_info[dev].sect,0,0,0,WIN_RESTORE,&recal_intr);
661 return reset;
662 }
663 if (!identified[dev]) {
664 identified[dev] = 1;
665 unmask_intr[dev] = DEFAULT_UNMASK_INTR;
666 mult_req[dev] = DEFAULT_MULT_COUNT;
667 hd_out(dev,0,0,0,0,WIN_IDENTIFY,&identify_intr);
668 return reset;
669 }
670 if (mult_req[dev] != mult_count[dev]) {
671 hd_out(dev,mult_req[dev],0,0,0,WIN_SETMULT,&set_multmode_intr);
672 return reset;
673 }
674 if (hd_info[dev].head > 16) {
675 printk ("hd%c: cannot handle device with more than 16 heads - giving up\n", dev+'a');
676 end_request(0);
677 }
678 special_op[dev] = 0;
679 return 1;
680 }
681
682
683
684
685
686
687
688
689
690
691
692
693
694 static void hd_request(void)
695 {
696 unsigned int dev, block, nsect, sec, track, head, cyl;
697
698 if (CURRENT && CURRENT->dev < 0) return;
699 if (DEVICE_INTR)
700 return;
701 repeat:
702 timer_active &= ~(1<<HD_TIMER);
703 sti();
704 INIT_REQUEST;
705 if (reset) {
706 cli();
707 reset_hd();
708 return;
709 }
710 dev = MINOR(CURRENT->dev);
711 block = CURRENT->sector;
712 nsect = CURRENT->nr_sectors;
713 if (dev >= (NR_HD<<6) || block >= hd[dev].nr_sects || ((block+nsect) > hd[dev].nr_sects)) {
714 #ifdef DEBUG
715 if (dev >= (NR_HD<<6))
716 printk("hd: bad minor number: device=0x%04x\n", CURRENT->dev);
717 else
718 printk("hd%c: bad access: block=%d, count=%d\n",
719 (CURRENT->dev>>6)+'a', block, nsect);
720 #endif
721 end_request(0);
722 goto repeat;
723 }
724 block += hd[dev].start_sect;
725 dev >>= 6;
726 if (special_op[dev]) {
727 if (do_special_op(dev))
728 goto repeat;
729 return;
730 }
731 sec = block % hd_info[dev].sect + 1;
732 track = block / hd_info[dev].sect;
733 head = track % hd_info[dev].head;
734 cyl = track / hd_info[dev].head;
735 #ifdef DEBUG
736 printk("hd%c: %sing: CHS=%d/%d/%d, sectors=%d, buffer=0x%08lx\n",
737 dev+'a', (CURRENT->cmd == READ)?"read":"writ",
738 cyl, head, sec, nsect, (unsigned long) CURRENT->buffer);
739 #endif
740 if (!unmask_intr[dev])
741 cli();
742 if (CURRENT->cmd == READ) {
743 unsigned int cmd = mult_count[dev] > 1 ? WIN_MULTREAD : WIN_READ;
744 hd_out(dev,nsect,sec,head,cyl,cmd,&read_intr);
745 if (reset)
746 goto repeat;
747 return;
748 }
749 if (CURRENT->cmd == WRITE) {
750 if (mult_count[dev])
751 hd_out(dev,nsect,sec,head,cyl,WIN_MULTWRITE,&multwrite_intr);
752 else
753 hd_out(dev,nsect,sec,head,cyl,WIN_WRITE,&write_intr);
754 if (reset)
755 goto repeat;
756 if (wait_DRQ()) {
757 bad_rw_intr();
758 goto repeat;
759 }
760 if (mult_count[dev]) {
761 WCURRENT = *CURRENT;
762 multwrite(dev);
763 } else
764 outsw(HD_DATA,CURRENT->buffer,256);
765 return;
766 }
767 panic("unknown hd-command");
768 }
769
770 static void do_hd_request (void)
771 {
772 disable_irq(HD_IRQ);
773 hd_request();
774 enable_irq(HD_IRQ);
775 }
776
777 static int hd_ioctl(struct inode * inode, struct file * file,
778 unsigned int cmd, unsigned long arg)
779 {
780 struct hd_geometry *loc = (struct hd_geometry *) arg;
781 int dev, err;
782 unsigned long flags;
783
784 if ((!inode) || (!inode->i_rdev))
785 return -EINVAL;
786 dev = DEVICE_NR(inode->i_rdev);
787 if (dev >= NR_HD)
788 return -EINVAL;
789 switch (cmd) {
790 case HDIO_GETGEO:
791 if (!loc) return -EINVAL;
792 err = verify_area(VERIFY_WRITE, loc, sizeof(*loc));
793 if (err)
794 return err;
795 put_user(bios_info[dev].head,
796 (char *) &loc->heads);
797 put_user(bios_info[dev].sect,
798 (char *) &loc->sectors);
799 put_user(bios_info[dev].cyl,
800 (short *) &loc->cylinders);
801 put_user(hd[MINOR(inode->i_rdev)].start_sect,
802 (long *) &loc->start);
803 return 0;
804 case BLKRASET:
805 if(!suser()) return -EACCES;
806 if(arg > 0xff) return -EINVAL;
807 read_ahead[MAJOR(inode->i_rdev)] = arg;
808 return 0;
809 case BLKRAGET:
810 if (!arg) return -EINVAL;
811 err = verify_area(VERIFY_WRITE, (long *) arg, sizeof(long));
812 if (err)
813 return err;
814 put_user(read_ahead[MAJOR(inode->i_rdev)],(long *) arg);
815 return 0;
816 case BLKGETSIZE:
817 if (!arg) return -EINVAL;
818 err = verify_area(VERIFY_WRITE, (long *) arg, sizeof(long));
819 if (err)
820 return err;
821 put_user(hd[MINOR(inode->i_rdev)].nr_sects, (long *) arg);
822 return 0;
823 case BLKFLSBUF:
824 if(!suser()) return -EACCES;
825 fsync_dev(inode->i_rdev);
826 invalidate_buffers(inode->i_rdev);
827 return 0;
828
829 case BLKRRPART:
830 return revalidate_hddisk(inode->i_rdev, 1);
831
832 case HDIO_SET_UNMASKINTR:
833 if (!suser()) return -EACCES;
834 if ((arg > 1) || (MINOR(inode->i_rdev) & 0x3F))
835 return -EINVAL;
836 unmask_intr[dev] = arg;
837 return 0;
838
839 case HDIO_GET_UNMASKINTR:
840 if (!arg) return -EINVAL;
841 err = verify_area(VERIFY_WRITE, (long *) arg, sizeof(long));
842 if (err)
843 return err;
844 put_user(unmask_intr[dev], (long *) arg);
845 return 0;
846
847 case HDIO_GET_MULTCOUNT:
848 if (!arg) return -EINVAL;
849 err = verify_area(VERIFY_WRITE, (long *) arg, sizeof(long));
850 if (err)
851 return err;
852 put_user(mult_count[dev], (long *) arg);
853 return 0;
854
855 case HDIO_SET_MULTCOUNT:
856 if (!suser()) return -EACCES;
857 if (MINOR(inode->i_rdev) & 0x3F) return -EINVAL;
858 save_flags(flags);
859 cli();
860 if (arg > max_mult[dev])
861 err = -EINVAL;
862 else if (mult_req[dev] != mult_count[dev]) {
863 special_op[dev] = 1;
864 err = -EBUSY;
865 } else {
866 mult_req[dev] = arg;
867 special_op[dev] = 1;
868 err = 0;
869 }
870 restore_flags(flags);
871 return err;
872
873 case HDIO_GET_IDENTITY:
874 if (!arg) return -EINVAL;
875 if (MINOR(inode->i_rdev) & 0x3F) return -EINVAL;
876 if (hd_ident_info[dev] == NULL) return -ENOMSG;
877 err = verify_area(VERIFY_WRITE, (char *) arg, sizeof(struct hd_driveid));
878 if (err)
879 return err;
880 memcpy_tofs((char *)arg, (char *) hd_ident_info[dev], sizeof(struct hd_driveid));
881 return 0;
882
883 RO_IOCTLS(inode->i_rdev,arg);
884 default:
885 return -EINVAL;
886 }
887 }
888
889 static int hd_open(struct inode * inode, struct file * filp)
890 {
891 int target;
892 target = DEVICE_NR(inode->i_rdev);
893
894 if (target >= NR_HD)
895 return -ENODEV;
896 while (busy[target])
897 sleep_on(&busy_wait);
898 access_count[target]++;
899 return 0;
900 }
901
902
903
904
905
906 static void hd_release(struct inode * inode, struct file * file)
907 {
908 int target;
909 sync_dev(inode->i_rdev);
910
911 target = DEVICE_NR(inode->i_rdev);
912 access_count[target]--;
913
914 }
915
916 static void hd_geninit(struct gendisk *);
917
918 static struct gendisk hd_gendisk = {
919 MAJOR_NR,
920 "hd",
921 6,
922 1 << 6,
923 MAX_HD,
924 hd_geninit,
925 hd,
926 hd_sizes,
927 0,
928 (void *) bios_info,
929 NULL
930 };
931
932 static void hd_interrupt(int irq, struct pt_regs *regs)
933 {
934 void (*handler)(void) = DEVICE_INTR;
935
936 DEVICE_INTR = NULL;
937 timer_active &= ~(1<<HD_TIMER);
938 if (!handler)
939 handler = unexpected_hd_interrupt;
940 handler();
941 sti();
942 }
943
944
945
946
947
948
949
950
951
952
953 static void hd_geninit(struct gendisk *ignored)
954 {
955 int i;
956
957 #ifdef __i386__
958 if (!NR_HD) {
959 extern struct drive_info drive_info;
960 unsigned char *BIOS = (unsigned char *) &drive_info;
961 int cmos_disks, drive;
962
963 for (drive=0 ; drive<2 ; drive++) {
964 bios_info[drive].cyl = hd_info[drive].cyl = *(unsigned short *) BIOS;
965 bios_info[drive].head = hd_info[drive].head = *(2+BIOS);
966 bios_info[drive].wpcom = hd_info[drive].wpcom = *(unsigned short *) (5+BIOS);
967 bios_info[drive].ctl = hd_info[drive].ctl = *(8+BIOS);
968 bios_info[drive].lzone = hd_info[drive].lzone = *(unsigned short *) (12+BIOS);
969 bios_info[drive].sect = hd_info[drive].sect = *(14+BIOS);
970 #ifdef does_not_work_for_everybody_with_scsi_but_helps_ibm_vp
971 if (hd_info[drive].cyl && NR_HD == drive)
972 NR_HD++;
973 #endif
974 BIOS += 16;
975 }
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999 if ((cmos_disks = CMOS_READ(0x12)) & 0xf0)
1000 if (cmos_disks & 0x0f)
1001 NR_HD = 2;
1002 else
1003 NR_HD = 1;
1004 }
1005 #endif
1006 i = NR_HD;
1007 while (i-- > 0) {
1008
1009
1010
1011
1012
1013
1014
1015
1016 hd[i<<6].nr_sects = bios_info[i].head *
1017 bios_info[i].sect * bios_info[i].cyl;
1018 hd_ident_info[i] = (struct hd_driveid *) kmalloc(512,GFP_KERNEL);
1019 special_op[i] = 1;
1020 }
1021 if (NR_HD) {
1022 if (request_irq(HD_IRQ, hd_interrupt, SA_INTERRUPT, "hd")) {
1023 printk("hd: unable to get IRQ%d for the harddisk driver\n",HD_IRQ);
1024 NR_HD = 0;
1025 } else {
1026 request_region(HD_DATA, 8, "hd");
1027 request_region(HD_CMD, 1, "hd(cmd)");
1028 }
1029 }
1030 hd_gendisk.nr_real = NR_HD;
1031
1032 for(i=0;i<(MAX_HD << 6);i++) hd_blocksizes[i] = 1024;
1033 blksize_size[MAJOR_NR] = hd_blocksizes;
1034 }
1035
1036 static struct file_operations hd_fops = {
1037 NULL,
1038 block_read,
1039 block_write,
1040 NULL,
1041 NULL,
1042 hd_ioctl,
1043 NULL,
1044 hd_open,
1045 hd_release,
1046 block_fsync
1047 };
1048
1049 unsigned long hd_init(unsigned long mem_start, unsigned long mem_end)
1050 {
1051 if (register_blkdev(MAJOR_NR,"hd",&hd_fops)) {
1052 printk("hd: unable to get major %d for harddisk\n",MAJOR_NR);
1053 return mem_start;
1054 }
1055 blk_dev[MAJOR_NR].request_fn = DEVICE_REQUEST;
1056 read_ahead[MAJOR_NR] = 8;
1057 hd_gendisk.next = gendisk_head;
1058 gendisk_head = &hd_gendisk;
1059 timer_table[HD_TIMER].fn = hd_times_out;
1060 return mem_start;
1061 }
1062
1063 #define DEVICE_BUSY busy[target]
1064 #define USAGE access_count[target]
1065 #define CAPACITY (bios_info[target].head*bios_info[target].sect*bios_info[target].cyl)
1066
1067
1068 #undef MAYBE_REINIT
1069 #define GENDISK_STRUCT hd_gendisk
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079 static int revalidate_hddisk(int dev, int maxusage)
1080 {
1081 int target, major;
1082 struct gendisk * gdev;
1083 int max_p;
1084 int start;
1085 int i;
1086 long flags;
1087
1088 target = DEVICE_NR(dev);
1089 gdev = &GENDISK_STRUCT;
1090
1091 save_flags(flags);
1092 cli();
1093 if (DEVICE_BUSY || USAGE > maxusage) {
1094 restore_flags(flags);
1095 return -EBUSY;
1096 };
1097 DEVICE_BUSY = 1;
1098 restore_flags(flags);
1099
1100 max_p = gdev->max_p;
1101 start = target << gdev->minor_shift;
1102 major = MAJOR_NR << 8;
1103
1104 for (i=max_p - 1; i >=0 ; i--) {
1105 sync_dev(major | start | i);
1106 invalidate_inodes(major | start | i);
1107 invalidate_buffers(major | start | i);
1108 gdev->part[start+i].start_sect = 0;
1109 gdev->part[start+i].nr_sects = 0;
1110 };
1111
1112 #ifdef MAYBE_REINIT
1113 MAYBE_REINIT;
1114 #endif
1115
1116 gdev->part[start].nr_sects = CAPACITY;
1117 resetup_one_dev(gdev, target);
1118
1119 DEVICE_BUSY = 0;
1120 wake_up(&busy_wait);
1121 return 0;
1122 }
1123