![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to cmd640.c CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [GnuMach] / Gnu-Mach / linux / src / drivers / block|
Return to cmd640.c CVS log | Up to [GnuMach] / Gnu-Mach / linux / src / drivers / block |
1.1 root 1: /*
2: * linux/drivers/block/cmd640.c Version 1.02 Sep 01, 1996
3: *
4: * Copyright (C) 1995-1996 Linus Torvalds & authors (see below)
5: */
6:
7: /*
8: * Original author: [email protected] (Igor Abramov)
9: *
10: * Maintained by: [email protected] (Mark Lord)
11: * with fanatical support from a legion of hackers!
12: *
13: * This file provides support for the advanced features and bugs
14: * of IDE interfaces using the CMD Technologies 0640 IDE interface chip.
15: *
16: * These chips are basically fucked by design, and getting this driver
17: * to work on every motherboard design that uses this screwed chip seems
18: * bloody well impossible. However, we're still trying.
19: *
20: * Version 0.97 worked for everybody.
21: *
22: * User feedback is essential. Many thanks to the beta test team:
23: *
24: * [email protected], [email protected], [email protected],
25: * [email protected], [email protected], [email protected],
26: * [email protected], [email protected],
27: * [email protected], [email protected],
28: * [email protected], [email protected], [email protected],
29: * [email protected], [email protected], [email protected],
30: * [email protected], [email protected], [email protected],
31: * [email protected], [email protected], [email protected],
32: * [email protected], [email protected], [email protected],
33: * [email protected], [email protected], [email protected], [email protected]
34: * [email protected], and others.
35: *
36: * Version 0.01 Initial version, hacked out of ide.c,
37: * and #include'd rather than compiled separately.
38: * This will get cleaned up in a subsequent release.
39: *
40: * Version 0.02 Fixes for vlb initialization code, enable prefetch
41: * for versions 'B' and 'C' of chip by default,
42: * some code cleanup.
43: *
44: * Version 0.03 Added reset of secondary interface,
45: * and black list for devices which are not compatible
46: * with prefetch mode. Separate function for setting
47: * prefetch is added, possibly it will be called some
48: * day from ioctl processing code.
49: *
50: * Version 0.04 Now configs/compiles separate from ide.c
51: *
52: * Version 0.05 Major rewrite of interface timing code.
53: * Added new function cmd640_set_mode to set PIO mode
54: * from ioctl call. New drives added to black list.
55: *
56: * Version 0.06 More code cleanup. Prefetch is enabled only for
57: * detected hard drives, not included in prefetch
58: * black list.
59: *
60: * Version 0.07 Changed to more conservative drive tuning policy.
61: * Unknown drives, which report PIO < 4 are set to
62: * (reported_PIO - 1) if it is supported, or to PIO0.
63: * List of known drives extended by info provided by
64: * CMD at their ftp site.
65: *
66: * Version 0.08 Added autotune/noautotune support.
67: *
68: * Version 0.09 Try to be smarter about 2nd port enabling.
69: * Version 0.10 Be nice and don't reset 2nd port.
70: * Version 0.11 Try to handle more wierd situations.
71: *
72: * Version 0.12 Lots of bug fixes from Laszlo Peter
73: * irq unmasking disabled for reliability.
74: * try to be even smarter about the second port.
75: * tidy up source code formatting.
76: * Version 0.13 permit irq unmasking again.
77: * Version 0.90 massive code cleanup, some bugs fixed.
78: * defaults all drives to PIO mode0, prefetch off.
79: * autotune is OFF by default, with compile time flag.
80: * prefetch can be turned OFF/ON using "hdparm -p8/-p9"
81: * (requires hdparm-3.1 or newer)
82: * Version 0.91 first release to linux-kernel list.
83: * Version 0.92 move initial reg dump to separate callable function
84: * change "readahead" to "prefetch" to avoid confusion
85: * Version 0.95 respect original BIOS timings unless autotuning.
86: * tons of code cleanup and rearrangement.
87: * added CONFIG_BLK_DEV_CMD640_ENHANCED option
88: * prevent use of unmask when prefetch is on
89: * Version 0.96 prevent use of io_32bit when prefetch is off
90: * Version 0.97 fix VLB secondary interface for [email protected]
91: * other minor tune-ups: 0.96 was very good.
92: * Version 0.98 ignore PCI version when disabled by BIOS
93: * Version 0.99 display setup/active/recovery clocks with PIO mode
94: * Version 1.00 Mmm.. cannot depend on PCMD_ENA in all systems
95: * Version 1.01 slow/fast devsel can be selected with "hdparm -p6/-p7"
96: * ("fast" is necessary for 32bit I/O in some systems)
97: * Version 1.02 fix bug that resulted in slow "setup times"
98: * (patch courtesy of Zoltan Hidvegi)
99: */
100:
101: #undef REALLY_SLOW_IO /* most systems can safely undef this */
102: #define CMD640_PREFETCH_MASKS 1
103:
104: #include <linux/config.h>
105: #include <linux/types.h>
106: #include <linux/kernel.h>
107: #include <linux/delay.h>
108: #include <linux/timer.h>
109: #include <linux/mm.h>
110: #include <linux/ioport.h>
111: #include <linux/blkdev.h>
112: #include <linux/hdreg.h>
113: #include <asm/io.h>
114: #include "ide.h"
115: #include "ide_modes.h"
116:
117: /*
118: * This flag is set in ide.c by the parameter: ide0=cmd640_vlb
119: */
120: int cmd640_vlb = 0;
121:
122: /*
123: * CMD640 specific registers definition.
124: */
125:
126: #define VID 0x00
127: #define DID 0x02
128: #define PCMD 0x04
129: #define PCMD_ENA 0x01
130: #define PSTTS 0x06
131: #define REVID 0x08
132: #define PROGIF 0x09
133: #define SUBCL 0x0a
134: #define BASCL 0x0b
135: #define BaseA0 0x10
136: #define BaseA1 0x14
137: #define BaseA2 0x18
138: #define BaseA3 0x1c
139: #define INTLINE 0x3c
140: #define INPINE 0x3d
141:
142: #define CFR 0x50
143: #define CFR_DEVREV 0x03
144: #define CFR_IDE01INTR 0x04
145: #define CFR_DEVID 0x18
146: #define CFR_AT_VESA_078h 0x20
147: #define CFR_DSA1 0x40
148: #define CFR_DSA0 0x80
149:
150: #define CNTRL 0x51
151: #define CNTRL_DIS_RA0 0x40
152: #define CNTRL_DIS_RA1 0x80
153: #define CNTRL_ENA_2ND 0x08
154:
155: #define CMDTIM 0x52
156: #define ARTTIM0 0x53
157: #define DRWTIM0 0x54
158: #define ARTTIM1 0x55
159: #define DRWTIM1 0x56
160: #define ARTTIM23 0x57
161: #define ARTTIM23_DIS_RA2 0x04
162: #define ARTTIM23_DIS_RA3 0x08
163: #define DRWTIM23 0x58
164: #define BRST 0x59
165:
166: /*
167: * Registers and masks for easy access by drive index:
168: */
169: static byte prefetch_regs[4] = {CNTRL, CNTRL, ARTTIM23, ARTTIM23};
170: static byte prefetch_masks[4] = {CNTRL_DIS_RA0, CNTRL_DIS_RA1, ARTTIM23_DIS_RA2, ARTTIM23_DIS_RA3};
171:
172: #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
173:
174: static byte arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23};
175: static byte drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM23, DRWTIM23};
176:
177: /*
178: * Current cmd640 timing values for each drive.
179: * The defaults for each are the slowest possible timings.
180: */
181: static byte setup_counts[4] = {4, 4, 4, 4}; /* Address setup count (in clocks) */
182: static byte active_counts[4] = {16, 16, 16, 16}; /* Active count (encoded) */
183: static byte recovery_counts[4] = {16, 16, 16, 16}; /* Recovery count (encoded) */
184:
185: #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
186:
187: /*
188: * These are initialized to point at the devices we control
189: */
190: static ide_hwif_t *cmd_hwif0, *cmd_hwif1;
191: static ide_drive_t *cmd_drives[4];
192:
193: /*
194: * Interface to access cmd640x registers
195: */
196: static unsigned int cmd640_key;
197: static void (*put_cmd640_reg)(unsigned short reg, byte val);
198: static byte (*get_cmd640_reg)(unsigned short reg);
199:
200: /*
201: * This is read from the CFR reg, and is used in several places.
202: */
203: static unsigned int cmd640_chip_version;
204:
205: /*
206: * The CMD640x chip does not support DWORD config write cycles, but some
207: * of the BIOSes use them to implement the config services.
208: * Therefore, we must use direct IO instead.
209: */
210:
211: /* PCI method 1 access */
212:
213: static void put_cmd640_reg_pci1 (unsigned short reg, byte val)
214: {
215: unsigned long flags;
216:
217: save_flags(flags);
218: cli();
219: outl_p((reg & 0xfc) | cmd640_key, 0xcf8);
220: outb_p(val, (reg & 3) | 0xcfc);
221: restore_flags(flags);
222: }
223:
224: static byte get_cmd640_reg_pci1 (unsigned short reg)
225: {
226: byte b;
227: unsigned long flags;
228:
229: save_flags(flags);
230: cli();
231: outl_p((reg & 0xfc) | cmd640_key, 0xcf8);
232: b = inb_p((reg & 3) | 0xcfc);
233: restore_flags(flags);
234: return b;
235: }
236:
237: /* PCI method 2 access (from CMD datasheet) */
238:
239: static void put_cmd640_reg_pci2 (unsigned short reg, byte val)
240: {
241: unsigned long flags;
242:
243: save_flags(flags);
244: cli();
245: outb_p(0x10, 0xcf8);
246: outb_p(val, cmd640_key + reg);
247: outb_p(0, 0xcf8);
248: restore_flags(flags);
249: }
250:
251: static byte get_cmd640_reg_pci2 (unsigned short reg)
252: {
253: byte b;
254: unsigned long flags;
255:
256: save_flags(flags);
257: cli();
258: outb_p(0x10, 0xcf8);
259: b = inb_p(cmd640_key + reg);
260: outb_p(0, 0xcf8);
261: restore_flags(flags);
262: return b;
263: }
264:
265: /* VLB access */
266:
267: static void put_cmd640_reg_vlb (unsigned short reg, byte val)
268: {
269: unsigned long flags;
270:
271: save_flags(flags);
272: cli();
273: outb_p(reg, cmd640_key);
274: outb_p(val, cmd640_key + 4);
275: restore_flags(flags);
276: }
277:
278: static byte get_cmd640_reg_vlb (unsigned short reg)
279: {
280: byte b;
281: unsigned long flags;
282:
283: save_flags(flags);
284: cli();
285: outb_p(reg, cmd640_key);
286: b = inb_p(cmd640_key + 4);
287: restore_flags(flags);
288: return b;
289: }
290:
291: static int match_pci_cmd640_device (void)
292: {
293: const byte ven_dev[4] = {0x95, 0x10, 0x40, 0x06};
294: unsigned int i;
295: for (i = 0; i < 4; i++) {
296: if (get_cmd640_reg(i) != ven_dev[i])
297: return 0;
298: }
299: #ifdef STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT
300: if ((get_cmd640_reg(PCMD) & PCMD_ENA) == 0) {
301: printk("ide: cmd640 on PCI disabled by BIOS\n");
302: return 0;
303: }
304: #endif /* STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT */
305: return 1; /* success */
306: }
307:
308: /*
309: * Probe for CMD640x -- pci method 1
310: */
311: static int probe_for_cmd640_pci1 (void)
312: {
313: get_cmd640_reg = get_cmd640_reg_pci1;
314: put_cmd640_reg = put_cmd640_reg_pci1;
315: for (cmd640_key = 0x80000000; cmd640_key <= 0x8000f800; cmd640_key += 0x800) {
316: if (match_pci_cmd640_device())
317: return 1; /* success */
318: }
319: return 0;
320: }
321:
322: /*
323: * Probe for CMD640x -- pci method 2
324: */
325: static int probe_for_cmd640_pci2 (void)
326: {
327: get_cmd640_reg = get_cmd640_reg_pci2;
328: put_cmd640_reg = put_cmd640_reg_pci2;
329: for (cmd640_key = 0xc000; cmd640_key <= 0xcf00; cmd640_key += 0x100) {
330: if (match_pci_cmd640_device())
331: return 1; /* success */
332: }
333: return 0;
334: }
335:
336: /*
337: * Probe for CMD640x -- vlb
338: */
339: static int probe_for_cmd640_vlb (void)
340: {
341: byte b;
342:
343: get_cmd640_reg = get_cmd640_reg_vlb;
344: put_cmd640_reg = put_cmd640_reg_vlb;
345: cmd640_key = 0x178;
346: b = get_cmd640_reg(CFR);
347: if (b == 0xff || b == 0x00 || (b & CFR_AT_VESA_078h)) {
348: cmd640_key = 0x78;
349: b = get_cmd640_reg(CFR);
350: if (b == 0xff || b == 0x00 || !(b & CFR_AT_VESA_078h))
351: return 0;
352: }
353: return 1; /* success */
354: }
355:
356: /*
357: * Returns 1 if an IDE interface/drive exists at 0x170,
358: * Returns 0 otherwise.
359: */
360: static int secondary_port_responding (void)
361: {
362: unsigned long flags;
363:
364: save_flags(flags);
365: cli();
366:
367: outb_p(0x0a, 0x170 + IDE_SELECT_OFFSET); /* select drive0 */
368: udelay(100);
369: if ((inb_p(0x170 + IDE_SELECT_OFFSET) & 0x1f) != 0x0a) {
370: outb_p(0x1a, 0x170 + IDE_SELECT_OFFSET); /* select drive1 */
371: udelay(100);
372: if ((inb_p(0x170 + IDE_SELECT_OFFSET) & 0x1f) != 0x1a) {
373: restore_flags(flags);
374: return 0; /* nothing responded */
375: }
376: }
377: restore_flags(flags);
378: return 1; /* success */
379: }
380:
381: #ifdef CMD640_DUMP_REGS
382: /*
383: * Dump out all cmd640 registers. May be called from ide.c
384: */
385: void cmd640_dump_regs (void)
386: {
387: unsigned int reg = cmd640_vlb ? 0x50 : 0x00;
388:
389: /* Dump current state of chip registers */
390: printk("ide: cmd640 internal register dump:");
391: for (; reg <= 0x59; reg++) {
392: if (!(reg & 0x0f))
393: printk("\n%04x:", reg);
394: printk(" %02x", get_cmd640_reg(reg));
395: }
396: printk("\n");
397: }
398: #endif
399:
400: /*
401: * Check whether prefetch is on for a drive,
402: * and initialize the unmask flags for safe operation.
403: */
404: static void check_prefetch (unsigned int index)
405: {
406: ide_drive_t *drive = cmd_drives[index];
407: byte b = get_cmd640_reg(prefetch_regs[index]);
408:
409: if (b & prefetch_masks[index]) { /* is prefetch off? */
410: drive->no_unmask = 0;
411: drive->no_io_32bit = 1;
412: drive->io_32bit = 0;
413: } else {
414: #if CMD640_PREFETCH_MASKS
415: drive->no_unmask = 1;
416: drive->unmask = 0;
417: #endif
418: drive->no_io_32bit = 0;
419: }
420: }
421:
422: /*
423: * Figure out which devices we control
424: */
425: static void setup_device_ptrs (void)
426: {
427: unsigned int i;
428:
429: cmd_hwif0 = &ide_hwifs[0]; /* default, if not found below */
430: cmd_hwif1 = &ide_hwifs[1]; /* default, if not found below */
431: for (i = 0; i < MAX_HWIFS; i++) {
432: ide_hwif_t *hwif = &ide_hwifs[i];
433: if (hwif->chipset == ide_unknown || hwif->chipset == ide_generic) {
434: if (hwif->io_base == 0x1f0)
435: cmd_hwif0 = hwif;
436: else if (hwif->io_base == 0x170)
437: cmd_hwif1 = hwif;
438: }
439: }
440: cmd_drives[0] = &cmd_hwif0->drives[0];
441: cmd_drives[1] = &cmd_hwif0->drives[1];
442: cmd_drives[2] = &cmd_hwif1->drives[0];
443: cmd_drives[3] = &cmd_hwif1->drives[1];
444: }
445:
446: #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
447:
448: /*
449: * Sets prefetch mode for a drive.
450: */
451: static void set_prefetch_mode (unsigned int index, int mode)
452: {
453: ide_drive_t *drive = cmd_drives[index];
454: int reg = prefetch_regs[index];
455: byte b;
456: unsigned long flags;
457:
458: save_flags(flags);
459: cli();
460: b = get_cmd640_reg(reg);
461: if (mode) { /* want prefetch on? */
462: #if CMD640_PREFETCH_MASKS
463: drive->no_unmask = 1;
464: drive->unmask = 0;
465: #endif
466: drive->no_io_32bit = 0;
467: b &= ~prefetch_masks[index]; /* enable prefetch */
468: } else {
469: drive->no_unmask = 0;
470: drive->no_io_32bit = 1;
471: drive->io_32bit = 0;
472: b |= prefetch_masks[index]; /* disable prefetch */
473: }
474: put_cmd640_reg(reg, b);
475: restore_flags(flags);
476: }
477:
478: /*
479: * Dump out current drive clocks settings
480: */
481: static void display_clocks (unsigned int index)
482: {
483: byte active_count, recovery_count;
484:
485: active_count = active_counts[index];
486: if (active_count == 1)
487: ++active_count;
488: recovery_count = recovery_counts[index];
489: if (active_count > 3 && recovery_count == 1)
490: ++recovery_count;
491: if (cmd640_chip_version > 1)
492: recovery_count += 1; /* cmd640b uses (count + 1)*/
493: printk(", clocks=%d/%d/%d\n", setup_counts[index], active_count, recovery_count);
494: }
495:
496: /*
497: * Pack active and recovery counts into single byte representation
498: * used by controller
499: */
500: inline static byte pack_nibbles (byte upper, byte lower)
501: {
502: return ((upper & 0x0f) << 4) | (lower & 0x0f);
503: }
504:
505: /*
506: * This routine retrieves the initial drive timings from the chipset.
507: */
508: static void retrieve_drive_counts (unsigned int index)
509: {
510: byte b;
511:
512: /*
513: * Get the internal setup timing, and convert to clock count
514: */
515: b = get_cmd640_reg(arttim_regs[index]) & ~0x3f;
516: switch (b) {
517: case 0x00: b = 4; break;
518: case 0x80: b = 3; break;
519: case 0x40: b = 2; break;
520: default: b = 5; break;
521: }
522: setup_counts[index] = b;
523:
524: /*
525: * Get the active/recovery counts
526: */
527: b = get_cmd640_reg(drwtim_regs[index]);
528: active_counts[index] = (b >> 4) ? (b >> 4) : 0x10;
529: recovery_counts[index] = (b & 0x0f) ? (b & 0x0f) : 0x10;
530: }
531:
532:
533: /*
534: * This routine writes the prepared setup/active/recovery counts
535: * for a drive into the cmd640 chipset registers to active them.
536: */
537: static void program_drive_counts (unsigned int index)
538: {
539: unsigned long flags;
540: byte setup_count = setup_counts[index];
541: byte active_count = active_counts[index];
542: byte recovery_count = recovery_counts[index];
543:
544: /*
545: * Set up address setup count and drive read/write timing registers.
546: * Primary interface has individual count/timing registers for
547: * each drive. Secondary interface has one common set of registers,
548: * so we merge the timings, using the slowest value for each timing.
549: */
550: if (index > 1) {
551: unsigned int mate;
552: if (cmd_drives[mate = index ^ 1]->present) {
553: if (setup_count < setup_counts[mate])
554: setup_count = setup_counts[mate];
555: if (active_count < active_counts[mate])
556: active_count = active_counts[mate];
557: if (recovery_count < recovery_counts[mate])
558: recovery_count = recovery_counts[mate];
559: }
560: }
561:
562: /*
563: * Convert setup_count to internal chipset representation
564: */
565: switch (setup_count) {
566: case 4: setup_count = 0x00; break;
567: case 3: setup_count = 0x80; break;
568: case 1:
569: case 2: setup_count = 0x40; break;
570: default: setup_count = 0xc0; /* case 5 */
571: }
572:
573: /*
574: * Now that everything is ready, program the new timings
575: */
576: save_flags (flags);
577: cli();
578: /*
579: * Program the address_setup clocks into ARTTIM reg,
580: * and then the active/recovery counts into the DRWTIM reg
581: * (this converts counts of 16 into counts of zero -- okay).
582: */
583: setup_count |= get_cmd640_reg(arttim_regs[index]) & 0x3f;
584: put_cmd640_reg(arttim_regs[index], setup_count);
585: put_cmd640_reg(drwtim_regs[index], pack_nibbles(active_count, recovery_count));
586: restore_flags(flags);
587: }
588:
589: /*
590: * Set a specific pio_mode for a drive
591: */
592: static void cmd640_set_mode (unsigned int index, byte pio_mode, unsigned int cycle_time)
593: {
594: int setup_time, active_time, recovery_time, clock_time;
595: byte setup_count, active_count, recovery_count, recovery_count2, cycle_count;
596: int bus_speed = ide_system_bus_speed();
597:
598: if (pio_mode > 5)
599: pio_mode = 5;
600: setup_time = ide_pio_timings[pio_mode].setup_time;
601: active_time = ide_pio_timings[pio_mode].active_time;
602: recovery_time = cycle_time - (setup_time + active_time);
603: clock_time = 1000 / bus_speed;
604: cycle_count = (cycle_time + clock_time - 1) / clock_time;
605:
606: setup_count = (setup_time + clock_time - 1) / clock_time;
607:
608: active_count = (active_time + clock_time - 1) / clock_time;
609: if (active_count < 2)
610: active_count = 2; /* minimum allowed by cmd640 */
611:
612: recovery_count = (recovery_time + clock_time - 1) / clock_time;
613: recovery_count2 = cycle_count - (setup_count + active_count);
614: if (recovery_count2 > recovery_count)
615: recovery_count = recovery_count2;
616: if (recovery_count < 2)
617: recovery_count = 2; /* minimum allowed by cmd640 */
618: if (recovery_count > 17) {
619: active_count += recovery_count - 17;
620: recovery_count = 17;
621: }
622: if (active_count > 16)
623: active_count = 16; /* maximum allowed by cmd640 */
624: if (cmd640_chip_version > 1)
625: recovery_count -= 1; /* cmd640b uses (count + 1)*/
626: if (recovery_count > 16)
627: recovery_count = 16; /* maximum allowed by cmd640 */
628:
629: setup_counts[index] = setup_count;
630: active_counts[index] = active_count;
631: recovery_counts[index] = recovery_count;
632:
633: /*
634: * In a perfect world, we might set the drive pio mode here
635: * (using WIN_SETFEATURE) before continuing.
636: *
637: * But we do not, because:
638: * 1) this is the wrong place to do it (proper is do_special() in ide.c)
639: * 2) in practice this is rarely, if ever, necessary
640: */
641: program_drive_counts (index);
642: }
643:
644: /*
645: * Drive PIO mode selection:
646: */
647: static void cmd640_tune_drive (ide_drive_t *drive, byte mode_wanted)
648: {
649: byte b;
650: ide_pio_data_t d;
651: unsigned int index = 0;
652:
653: while (drive != cmd_drives[index]) {
654: if (++index > 3) {
655: printk("%s: bad news in cmd640_tune_drive\n", drive->name);
656: return;
657: }
658: }
659: switch (mode_wanted) {
660: case 6: /* set fast-devsel off */
661: case 7: /* set fast-devsel on */
662: mode_wanted &= 1;
663: b = get_cmd640_reg(CNTRL) & ~0x27;
664: if (mode_wanted)
665: b |= 0x27;
666: put_cmd640_reg(CNTRL, b);
667: printk("%s: %sabled cmd640 fast host timing (devsel)\n", drive->name, mode_wanted ? "en" : "dis");
668: return;
669:
670: case 8: /* set prefetch off */
671: case 9: /* set prefetch on */
672: mode_wanted &= 1;
673: set_prefetch_mode(index, mode_wanted);
674: printk("%s: %sabled cmd640 prefetch\n", drive->name, mode_wanted ? "en" : "dis");
675: return;
676: }
677:
678: (void) ide_get_best_pio_mode (drive, mode_wanted, 5, &d);
679: cmd640_set_mode (index, d.pio_mode, d.cycle_time);
680:
681: printk ("%s: selected cmd640 PIO mode%d (%dns) %s/IORDY%s",
682: drive->name,
683: d.pio_mode,
684: d.cycle_time,
685: d.use_iordy ? "w" : "wo",
686: d.overridden ? " (overriding vendor mode)" : "");
687: display_clocks(index);
688: }
689:
690: #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
691:
692: /*
693: * Probe for a cmd640 chipset, and initialize it if found. Called from ide.c
694: */
695: int ide_probe_for_cmd640x (void)
696: {
697: #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
698: int second_port_toggled = 0;
699: #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
700: int second_port_cmd640 = 0;
701: const char *bus_type, *port2;
702: unsigned int index;
703: byte b, cfr;
704:
705: if (cmd640_vlb && probe_for_cmd640_vlb()) {
706: bus_type = "VLB";
707: } else {
708: cmd640_vlb = 0;
709: if (probe_for_cmd640_pci1())
710: bus_type = "PCI (type1)";
711: else if (probe_for_cmd640_pci2())
712: bus_type = "PCI (type2)";
713: else
714: return 0;
715: }
716: /*
717: * Undocumented magic (there is no 0x5b reg in specs)
718: */
719: put_cmd640_reg(0x5b, 0xbd);
720: if (get_cmd640_reg(0x5b) != 0xbd) {
721: printk("ide: cmd640 init failed: wrong value in reg 0x5b\n");
722: return 0;
723: }
724: put_cmd640_reg(0x5b, 0);
725:
726: #ifdef CMD640_DUMP_REGS
727: CMD640_DUMP_REGS;
728: #endif
729:
730: /*
731: * Documented magic begins here
732: */
733: cfr = get_cmd640_reg(CFR);
734: cmd640_chip_version = cfr & CFR_DEVREV;
735: if (cmd640_chip_version == 0) {
736: printk ("ide: bad cmd640 revision: %d\n", cmd640_chip_version);
737: return 0;
738: }
739:
740: /*
741: * Initialize data for primary port
742: */
743: setup_device_ptrs ();
744: printk("%s: buggy cmd640%c interface on %s, config=0x%02x\n",
745: cmd_hwif0->name, 'a' + cmd640_chip_version - 1, bus_type, cfr);
746: cmd_hwif0->chipset = ide_cmd640;
747: #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
748: cmd_hwif0->tuneproc = &cmd640_tune_drive;
749: #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
750:
751: /*
752: * Ensure compatibility by always using the slowest timings
753: * for access to the drive's command register block,
754: * and reset the prefetch burstsize to default (512 bytes).
755: *
756: * Maybe we need a way to NOT do these on *some* systems?
757: */
758: put_cmd640_reg(CMDTIM, 0);
759: put_cmd640_reg(BRST, 0x40);
760:
761: /*
762: * Try to enable the secondary interface, if not already enabled
763: */
764: if (cmd_hwif1->noprobe) {
765: port2 = "not probed";
766: } else {
767: b = get_cmd640_reg(CNTRL);
768: if (secondary_port_responding()) {
769: if ((b & CNTRL_ENA_2ND)) {
770: second_port_cmd640 = 1;
771: port2 = "okay";
772: } else if (cmd640_vlb) {
773: second_port_cmd640 = 1;
774: port2 = "alive";
775: } else
776: port2 = "not cmd640";
777: } else {
778: put_cmd640_reg(CNTRL, b ^ CNTRL_ENA_2ND); /* toggle the bit */
779: if (secondary_port_responding()) {
780: second_port_cmd640 = 1;
781: #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
782: second_port_toggled = 1;
783: #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
784: port2 = "enabled";
785: } else {
786: put_cmd640_reg(CNTRL, b); /* restore original setting */
787: port2 = "not responding";
788: }
789: }
790: }
791:
792: /*
793: * Initialize data for secondary cmd640 port, if enabled
794: */
795: if (second_port_cmd640) {
796: cmd_hwif0->serialized = 1;
797: cmd_hwif1->serialized = 1;
798: cmd_hwif1->chipset = ide_cmd640;
799: #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
800: cmd_hwif1->tuneproc = &cmd640_tune_drive;
801: #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
802: }
803: printk("%s: %sserialized, secondary interface %s\n", cmd_hwif1->name,
804: cmd_hwif0->serialized ? "" : "not ", port2);
805:
806: /*
807: * Establish initial timings/prefetch for all drives.
808: * Do not unnecessarily disturb any prior BIOS setup of these.
809: */
810: for (index = 0; index < (2 + (second_port_cmd640 << 1)); index++) {
811: ide_drive_t *drive = cmd_drives[index];
812: #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
813: if (drive->autotune || ((index > 1) && second_port_toggled)) {
814: /*
815: * Reset timing to the slowest speed and turn off prefetch.
816: * This way, the drive identify code has a better chance.
817: */
818: setup_counts [index] = 4; /* max possible */
819: active_counts [index] = 16; /* max possible */
820: recovery_counts [index] = 16; /* max possible */
821: program_drive_counts (index);
822: set_prefetch_mode (index, 0);
823: printk("cmd640: drive%d timings/prefetch cleared\n", index);
824: } else {
825: /*
826: * Record timings/prefetch without changing them.
827: * This preserves any prior BIOS setup.
828: */
829: retrieve_drive_counts (index);
830: check_prefetch (index);
831: printk("cmd640: drive%d timings/prefetch(%s) preserved",
832: index, drive->no_io_32bit ? "off" : "on");
833: display_clocks(index);
834: }
835: #else
836: /*
837: * Set the drive unmask flags to match the prefetch setting
838: */
839: check_prefetch (index);
840: printk("cmd640: drive%d timings/prefetch(%s) preserved\n",
841: index, drive->no_io_32bit ? "off" : "on");
842: #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
843: }
844:
845: #ifdef CMD640_DUMP_REGS
846: CMD640_DUMP_REGS;
847: #endif
848: return 1;
849: }
850:
This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.