blob: 9689494efa24a8673ba39aedb6b9c0bcb8916ad1 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/drivers/ide/pci/cmd640.c Version 1.02 Sep 01, 1996
3 *
4 * Copyright (C) 1995-1996 Linus Torvalds & authors (see below)
5 */
6
7/*
8 * Original authors: abramov@cecmow.enet.dec.com (Igor Abramov)
9 * mlord@pobox.com (Mark Lord)
10 *
11 * See linux/MAINTAINERS for address of current maintainer.
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 * A.Hartgers@stud.tue.nl, JZDQC@CUNYVM.CUNY.edu, abramov@cecmow.enet.dec.com,
25 * bardj@utopia.ppp.sn.no, bart@gaga.tue.nl, bbol001@cs.auckland.ac.nz,
26 * chrisc@dbass.demon.co.uk, dalecki@namu26.Num.Math.Uni-Goettingen.de,
27 * derekn@vw.ece.cmu.edu, florian@btp2x3.phy.uni-bayreuth.de,
28 * flynn@dei.unipd.it, gadio@netvision.net.il, godzilla@futuris.net,
29 * j@pobox.com, jkemp1@mises.uni-paderborn.de, jtoppe@hiwaay.net,
30 * kerouac@ssnet.com, meskes@informatik.rwth-aachen.de, hzoli@cs.elte.hu,
31 * peter@udgaard.isgtec.com, phil@tazenda.demon.co.uk, roadcapw@cfw.com,
32 * s0033las@sun10.vsz.bme.hu, schaffer@tam.cornell.edu, sjd@slip.net,
33 * steve@ei.org, ulrpeg@bigcomm.gun.de, ism@tardis.ed.ac.uk, mack@cray.com
34 * liug@mama.indstate.edu, 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 weird 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 sjd@slip.net
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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101#define CMD640_PREFETCH_MASKS 1
102
103//#define CMD640_DUMP_REGS
104
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105#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 <linux/ide.h>
114#include <linux/init.h>
115
116#include <asm/io.h>
117
118/*
119 * This flag is set in ide.c by the parameter: ide0=cmd640_vlb
120 */
121int cmd640_vlb = 0;
122
123/*
124 * CMD640 specific registers definition.
125 */
126
127#define VID 0x00
128#define DID 0x02
129#define PCMD 0x04
130#define PCMD_ENA 0x01
131#define PSTTS 0x06
132#define REVID 0x08
133#define PROGIF 0x09
134#define SUBCL 0x0a
135#define BASCL 0x0b
136#define BaseA0 0x10
137#define BaseA1 0x14
138#define BaseA2 0x18
139#define BaseA3 0x1c
140#define INTLINE 0x3c
141#define INPINE 0x3d
142
143#define CFR 0x50
144#define CFR_DEVREV 0x03
145#define CFR_IDE01INTR 0x04
146#define CFR_DEVID 0x18
147#define CFR_AT_VESA_078h 0x20
148#define CFR_DSA1 0x40
149#define CFR_DSA0 0x80
150
151#define CNTRL 0x51
152#define CNTRL_DIS_RA0 0x40
153#define CNTRL_DIS_RA1 0x80
154#define CNTRL_ENA_2ND 0x08
155
156#define CMDTIM 0x52
157#define ARTTIM0 0x53
158#define DRWTIM0 0x54
159#define ARTTIM1 0x55
160#define DRWTIM1 0x56
161#define ARTTIM23 0x57
162#define ARTTIM23_DIS_RA2 0x04
163#define ARTTIM23_DIS_RA3 0x08
164#define DRWTIM23 0x58
165#define BRST 0x59
166
167/*
168 * Registers and masks for easy access by drive index:
169 */
170static u8 prefetch_regs[4] = {CNTRL, CNTRL, ARTTIM23, ARTTIM23};
171static u8 prefetch_masks[4] = {CNTRL_DIS_RA0, CNTRL_DIS_RA1, ARTTIM23_DIS_RA2, ARTTIM23_DIS_RA3};
172
173#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
174
175static u8 arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23};
176static u8 drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM23, DRWTIM23};
177
178/*
179 * Current cmd640 timing values for each drive.
180 * The defaults for each are the slowest possible timings.
181 */
182static u8 setup_counts[4] = {4, 4, 4, 4}; /* Address setup count (in clocks) */
183static u8 active_counts[4] = {16, 16, 16, 16}; /* Active count (encoded) */
184static u8 recovery_counts[4] = {16, 16, 16, 16}; /* Recovery count (encoded) */
185
186#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
187
188/*
189 * These are initialized to point at the devices we control
190 */
191static ide_hwif_t *cmd_hwif0, *cmd_hwif1;
192static ide_drive_t *cmd_drives[4];
193
194/*
195 * Interface to access cmd640x registers
196 */
197static unsigned int cmd640_key;
198static void (*__put_cmd640_reg)(u16 reg, u8 val);
199static u8 (*__get_cmd640_reg)(u16 reg);
200
201/*
202 * This is read from the CFR reg, and is used in several places.
203 */
204static unsigned int cmd640_chip_version;
205
206/*
207 * The CMD640x chip does not support DWORD config write cycles, but some
208 * of the BIOSes use them to implement the config services.
209 * Therefore, we must use direct IO instead.
210 */
211
212/* PCI method 1 access */
213
214static void put_cmd640_reg_pci1 (u16 reg, u8 val)
215{
216 outl_p((reg & 0xfc) | cmd640_key, 0xcf8);
217 outb_p(val, (reg & 3) | 0xcfc);
218}
219
220static u8 get_cmd640_reg_pci1 (u16 reg)
221{
222 outl_p((reg & 0xfc) | cmd640_key, 0xcf8);
223 return inb_p((reg & 3) | 0xcfc);
224}
225
226/* PCI method 2 access (from CMD datasheet) */
227
228static void put_cmd640_reg_pci2 (u16 reg, u8 val)
229{
230 outb_p(0x10, 0xcf8);
231 outb_p(val, cmd640_key + reg);
232 outb_p(0, 0xcf8);
233}
234
235static u8 get_cmd640_reg_pci2 (u16 reg)
236{
237 u8 b;
238
239 outb_p(0x10, 0xcf8);
240 b = inb_p(cmd640_key + reg);
241 outb_p(0, 0xcf8);
242 return b;
243}
244
245/* VLB access */
246
247static void put_cmd640_reg_vlb (u16 reg, u8 val)
248{
249 outb_p(reg, cmd640_key);
250 outb_p(val, cmd640_key + 4);
251}
252
253static u8 get_cmd640_reg_vlb (u16 reg)
254{
255 outb_p(reg, cmd640_key);
256 return inb_p(cmd640_key + 4);
257}
258
259static u8 get_cmd640_reg(u16 reg)
260{
261 u8 b;
262 unsigned long flags;
263
264 spin_lock_irqsave(&ide_lock, flags);
265 b = __get_cmd640_reg(reg);
266 spin_unlock_irqrestore(&ide_lock, flags);
267 return b;
268}
269
270static void put_cmd640_reg(u16 reg, u8 val)
271{
272 unsigned long flags;
273
274 spin_lock_irqsave(&ide_lock, flags);
275 __put_cmd640_reg(reg,val);
276 spin_unlock_irqrestore(&ide_lock, flags);
277}
278
279static int __init match_pci_cmd640_device (void)
280{
281 const u8 ven_dev[4] = {0x95, 0x10, 0x40, 0x06};
282 unsigned int i;
283 for (i = 0; i < 4; i++) {
284 if (get_cmd640_reg(i) != ven_dev[i])
285 return 0;
286 }
287#ifdef STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT
288 if ((get_cmd640_reg(PCMD) & PCMD_ENA) == 0) {
289 printk("ide: cmd640 on PCI disabled by BIOS\n");
290 return 0;
291 }
292#endif /* STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT */
293 return 1; /* success */
294}
295
296/*
297 * Probe for CMD640x -- pci method 1
298 */
299static int __init probe_for_cmd640_pci1 (void)
300{
301 __get_cmd640_reg = get_cmd640_reg_pci1;
302 __put_cmd640_reg = put_cmd640_reg_pci1;
303 for (cmd640_key = 0x80000000;
304 cmd640_key <= 0x8000f800;
305 cmd640_key += 0x800) {
306 if (match_pci_cmd640_device())
307 return 1; /* success */
308 }
309 return 0;
310}
311
312/*
313 * Probe for CMD640x -- pci method 2
314 */
315static int __init probe_for_cmd640_pci2 (void)
316{
317 __get_cmd640_reg = get_cmd640_reg_pci2;
318 __put_cmd640_reg = put_cmd640_reg_pci2;
319 for (cmd640_key = 0xc000; cmd640_key <= 0xcf00; cmd640_key += 0x100) {
320 if (match_pci_cmd640_device())
321 return 1; /* success */
322 }
323 return 0;
324}
325
326/*
327 * Probe for CMD640x -- vlb
328 */
329static int __init probe_for_cmd640_vlb (void)
330{
331 u8 b;
332
333 __get_cmd640_reg = get_cmd640_reg_vlb;
334 __put_cmd640_reg = put_cmd640_reg_vlb;
335 cmd640_key = 0x178;
336 b = get_cmd640_reg(CFR);
337 if (b == 0xff || b == 0x00 || (b & CFR_AT_VESA_078h)) {
338 cmd640_key = 0x78;
339 b = get_cmd640_reg(CFR);
340 if (b == 0xff || b == 0x00 || !(b & CFR_AT_VESA_078h))
341 return 0;
342 }
343 return 1; /* success */
344}
345
346/*
347 * Returns 1 if an IDE interface/drive exists at 0x170,
348 * Returns 0 otherwise.
349 */
350static int __init secondary_port_responding (void)
351{
352 unsigned long flags;
353
354 spin_lock_irqsave(&ide_lock, flags);
355
356 outb_p(0x0a, 0x170 + IDE_SELECT_OFFSET); /* select drive0 */
357 udelay(100);
358 if ((inb_p(0x170 + IDE_SELECT_OFFSET) & 0x1f) != 0x0a) {
359 outb_p(0x1a, 0x170 + IDE_SELECT_OFFSET); /* select drive1 */
360 udelay(100);
361 if ((inb_p(0x170 + IDE_SELECT_OFFSET) & 0x1f) != 0x1a) {
362 spin_unlock_irqrestore(&ide_lock, flags);
363 return 0; /* nothing responded */
364 }
365 }
366 spin_unlock_irqrestore(&ide_lock, flags);
367 return 1; /* success */
368}
369
370#ifdef CMD640_DUMP_REGS
371/*
372 * Dump out all cmd640 registers. May be called from ide.c
373 */
374static void cmd640_dump_regs (void)
375{
376 unsigned int reg = cmd640_vlb ? 0x50 : 0x00;
377
378 /* Dump current state of chip registers */
379 printk("ide: cmd640 internal register dump:");
380 for (; reg <= 0x59; reg++) {
381 if (!(reg & 0x0f))
382 printk("\n%04x:", reg);
383 printk(" %02x", get_cmd640_reg(reg));
384 }
385 printk("\n");
386}
387#endif
388
389/*
390 * Check whether prefetch is on for a drive,
391 * and initialize the unmask flags for safe operation.
392 */
393static void __init check_prefetch (unsigned int index)
394{
395 ide_drive_t *drive = cmd_drives[index];
396 u8 b = get_cmd640_reg(prefetch_regs[index]);
397
398 if (b & prefetch_masks[index]) { /* is prefetch off? */
399 drive->no_unmask = 0;
400 drive->no_io_32bit = 1;
401 drive->io_32bit = 0;
402 } else {
403#if CMD640_PREFETCH_MASKS
404 drive->no_unmask = 1;
405 drive->unmask = 0;
406#endif
407 drive->no_io_32bit = 0;
408 }
409}
410
411/*
412 * Figure out which devices we control
413 */
414static void __init setup_device_ptrs (void)
415{
416 unsigned int i;
417
418 cmd_hwif0 = &ide_hwifs[0]; /* default, if not found below */
419 cmd_hwif1 = &ide_hwifs[1]; /* default, if not found below */
420 for (i = 0; i < MAX_HWIFS; i++) {
421 ide_hwif_t *hwif = &ide_hwifs[i];
422 if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced) {
423 if (hwif->io_ports[IDE_DATA_OFFSET] == 0x1f0)
424 cmd_hwif0 = hwif;
425 else if (hwif->io_ports[IDE_DATA_OFFSET] == 0x170)
426 cmd_hwif1 = hwif;
427 }
428 }
429 cmd_drives[0] = &cmd_hwif0->drives[0];
430 cmd_drives[1] = &cmd_hwif0->drives[1];
431 cmd_drives[2] = &cmd_hwif1->drives[0];
432 cmd_drives[3] = &cmd_hwif1->drives[1];
433}
434
435#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
436
437/*
438 * Sets prefetch mode for a drive.
439 */
440static void set_prefetch_mode (unsigned int index, int mode)
441{
442 ide_drive_t *drive = cmd_drives[index];
443 int reg = prefetch_regs[index];
444 u8 b;
445 unsigned long flags;
446
447 spin_lock_irqsave(&ide_lock, flags);
448 b = __get_cmd640_reg(reg);
449 if (mode) { /* want prefetch on? */
450#if CMD640_PREFETCH_MASKS
451 drive->no_unmask = 1;
452 drive->unmask = 0;
453#endif
454 drive->no_io_32bit = 0;
455 b &= ~prefetch_masks[index]; /* enable prefetch */
456 } else {
457 drive->no_unmask = 0;
458 drive->no_io_32bit = 1;
459 drive->io_32bit = 0;
460 b |= prefetch_masks[index]; /* disable prefetch */
461 }
462 __put_cmd640_reg(reg, b);
463 spin_unlock_irqrestore(&ide_lock, flags);
464}
465
466/*
467 * Dump out current drive clocks settings
468 */
469static void display_clocks (unsigned int index)
470{
471 u8 active_count, recovery_count;
472
473 active_count = active_counts[index];
474 if (active_count == 1)
475 ++active_count;
476 recovery_count = recovery_counts[index];
477 if (active_count > 3 && recovery_count == 1)
478 ++recovery_count;
479 if (cmd640_chip_version > 1)
480 recovery_count += 1; /* cmd640b uses (count + 1)*/
481 printk(", clocks=%d/%d/%d\n", setup_counts[index], active_count, recovery_count);
482}
483
484/*
485 * Pack active and recovery counts into single byte representation
486 * used by controller
487 */
Jesper Juhl77933d72005-07-27 11:46:09 -0700488static inline u8 pack_nibbles (u8 upper, u8 lower)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489{
490 return ((upper & 0x0f) << 4) | (lower & 0x0f);
491}
492
493/*
494 * This routine retrieves the initial drive timings from the chipset.
495 */
496static void __init retrieve_drive_counts (unsigned int index)
497{
498 u8 b;
499
500 /*
501 * Get the internal setup timing, and convert to clock count
502 */
503 b = get_cmd640_reg(arttim_regs[index]) & ~0x3f;
504 switch (b) {
505 case 0x00: b = 4; break;
506 case 0x80: b = 3; break;
507 case 0x40: b = 2; break;
508 default: b = 5; break;
509 }
510 setup_counts[index] = b;
511
512 /*
513 * Get the active/recovery counts
514 */
515 b = get_cmd640_reg(drwtim_regs[index]);
516 active_counts[index] = (b >> 4) ? (b >> 4) : 0x10;
517 recovery_counts[index] = (b & 0x0f) ? (b & 0x0f) : 0x10;
518}
519
520
521/*
522 * This routine writes the prepared setup/active/recovery counts
523 * for a drive into the cmd640 chipset registers to active them.
524 */
525static void program_drive_counts (unsigned int index)
526{
527 unsigned long flags;
528 u8 setup_count = setup_counts[index];
529 u8 active_count = active_counts[index];
530 u8 recovery_count = recovery_counts[index];
531
532 /*
533 * Set up address setup count and drive read/write timing registers.
534 * Primary interface has individual count/timing registers for
535 * each drive. Secondary interface has one common set of registers,
536 * so we merge the timings, using the slowest value for each timing.
537 */
538 if (index > 1) {
539 unsigned int mate;
540 if (cmd_drives[mate = index ^ 1]->present) {
541 if (setup_count < setup_counts[mate])
542 setup_count = setup_counts[mate];
543 if (active_count < active_counts[mate])
544 active_count = active_counts[mate];
545 if (recovery_count < recovery_counts[mate])
546 recovery_count = recovery_counts[mate];
547 }
548 }
549
550 /*
551 * Convert setup_count to internal chipset representation
552 */
553 switch (setup_count) {
554 case 4: setup_count = 0x00; break;
555 case 3: setup_count = 0x80; break;
556 case 1:
557 case 2: setup_count = 0x40; break;
558 default: setup_count = 0xc0; /* case 5 */
559 }
560
561 /*
562 * Now that everything is ready, program the new timings
563 */
564 spin_lock_irqsave(&ide_lock, flags);
565 /*
566 * Program the address_setup clocks into ARTTIM reg,
567 * and then the active/recovery counts into the DRWTIM reg
568 * (this converts counts of 16 into counts of zero -- okay).
569 */
570 setup_count |= __get_cmd640_reg(arttim_regs[index]) & 0x3f;
571 __put_cmd640_reg(arttim_regs[index], setup_count);
572 __put_cmd640_reg(drwtim_regs[index], pack_nibbles(active_count, recovery_count));
573 spin_unlock_irqrestore(&ide_lock, flags);
574}
575
576/*
577 * Set a specific pio_mode for a drive
578 */
579static void cmd640_set_mode (unsigned int index, u8 pio_mode, unsigned int cycle_time)
580{
581 int setup_time, active_time, recovery_time, clock_time;
582 u8 setup_count, active_count, recovery_count, recovery_count2, cycle_count;
583 int bus_speed = system_bus_clock();
584
585 if (pio_mode > 5)
586 pio_mode = 5;
587 setup_time = ide_pio_timings[pio_mode].setup_time;
588 active_time = ide_pio_timings[pio_mode].active_time;
589 recovery_time = cycle_time - (setup_time + active_time);
590 clock_time = 1000 / bus_speed;
591 cycle_count = (cycle_time + clock_time - 1) / clock_time;
592
593 setup_count = (setup_time + clock_time - 1) / clock_time;
594
595 active_count = (active_time + clock_time - 1) / clock_time;
596 if (active_count < 2)
597 active_count = 2; /* minimum allowed by cmd640 */
598
599 recovery_count = (recovery_time + clock_time - 1) / clock_time;
600 recovery_count2 = cycle_count - (setup_count + active_count);
601 if (recovery_count2 > recovery_count)
602 recovery_count = recovery_count2;
603 if (recovery_count < 2)
604 recovery_count = 2; /* minimum allowed by cmd640 */
605 if (recovery_count > 17) {
606 active_count += recovery_count - 17;
607 recovery_count = 17;
608 }
609 if (active_count > 16)
610 active_count = 16; /* maximum allowed by cmd640 */
611 if (cmd640_chip_version > 1)
612 recovery_count -= 1; /* cmd640b uses (count + 1)*/
613 if (recovery_count > 16)
614 recovery_count = 16; /* maximum allowed by cmd640 */
615
616 setup_counts[index] = setup_count;
617 active_counts[index] = active_count;
618 recovery_counts[index] = recovery_count;
619
620 /*
621 * In a perfect world, we might set the drive pio mode here
622 * (using WIN_SETFEATURE) before continuing.
623 *
624 * But we do not, because:
625 * 1) this is the wrong place to do it (proper is do_special() in ide.c)
626 * 2) in practice this is rarely, if ever, necessary
627 */
628 program_drive_counts (index);
629}
630
631/*
632 * Drive PIO mode selection:
633 */
634static void cmd640_tune_drive (ide_drive_t *drive, u8 mode_wanted)
635{
Bartlomiej Zolnierkiewicz7dd00082007-07-20 01:11:56 +0200636 unsigned int index = 0, cycle_time;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 u8 b;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638
639 while (drive != cmd_drives[index]) {
640 if (++index > 3) {
641 printk("%s: bad news in cmd640_tune_drive\n", drive->name);
642 return;
643 }
644 }
645 switch (mode_wanted) {
646 case 6: /* set fast-devsel off */
647 case 7: /* set fast-devsel on */
648 mode_wanted &= 1;
649 b = get_cmd640_reg(CNTRL) & ~0x27;
650 if (mode_wanted)
651 b |= 0x27;
652 put_cmd640_reg(CNTRL, b);
653 printk("%s: %sabled cmd640 fast host timing (devsel)\n", drive->name, mode_wanted ? "en" : "dis");
654 return;
655
656 case 8: /* set prefetch off */
657 case 9: /* set prefetch on */
658 mode_wanted &= 1;
659 set_prefetch_mode(index, mode_wanted);
660 printk("%s: %sabled cmd640 prefetch\n", drive->name, mode_wanted ? "en" : "dis");
661 return;
662 }
663
Bartlomiej Zolnierkiewicz21347582007-07-20 01:11:58 +0200664 mode_wanted = ide_get_best_pio_mode(drive, mode_wanted, 5);
Bartlomiej Zolnierkiewicz7dd00082007-07-20 01:11:56 +0200665 cycle_time = ide_pio_cycle_time(drive, mode_wanted);
666 cmd640_set_mode(index, mode_wanted, cycle_time);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
Bartlomiej Zolnierkiewicz342cdb62007-07-20 01:11:55 +0200668 printk("%s: selected cmd640 PIO mode%d (%dns)",
Bartlomiej Zolnierkiewicz7dd00082007-07-20 01:11:56 +0200669 drive->name, mode_wanted, cycle_time);
Bartlomiej Zolnierkiewicz342cdb62007-07-20 01:11:55 +0200670
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671 display_clocks(index);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672}
673
674#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
675
676static int pci_conf1(void)
677{
678 u32 tmp;
679 unsigned long flags;
680
681 spin_lock_irqsave(&ide_lock, flags);
682 outb(0x01, 0xCFB);
683 tmp = inl(0xCF8);
684 outl(0x80000000, 0xCF8);
685 if (inl(0xCF8) == 0x80000000) {
686 outl(tmp, 0xCF8);
687 spin_unlock_irqrestore(&ide_lock, flags);
688 return 1;
689 }
690 outl(tmp, 0xCF8);
691 spin_unlock_irqrestore(&ide_lock, flags);
692 return 0;
693}
694
695static int pci_conf2(void)
696{
697 unsigned long flags;
698
699 spin_lock_irqsave(&ide_lock, flags);
700 outb(0x00, 0xCFB);
701 outb(0x00, 0xCF8);
702 outb(0x00, 0xCFA);
703 if (inb(0xCF8) == 0x00 && inb(0xCF8) == 0x00) {
704 spin_unlock_irqrestore(&ide_lock, flags);
705 return 1;
706 }
707 spin_unlock_irqrestore(&ide_lock, flags);
708 return 0;
709}
710
711/*
712 * Probe for a cmd640 chipset, and initialize it if found. Called from ide.c
713 */
714int __init ide_probe_for_cmd640x (void)
715{
716#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
717 int second_port_toggled = 0;
718#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
719 int second_port_cmd640 = 0;
720 const char *bus_type, *port2;
721 unsigned int index;
722 u8 b, cfr;
723
724 if (cmd640_vlb && probe_for_cmd640_vlb()) {
725 bus_type = "VLB";
726 } else {
727 cmd640_vlb = 0;
728 /* Find out what kind of PCI probing is supported otherwise
729 Justin Gibbs will sulk.. */
730 if (pci_conf1() && probe_for_cmd640_pci1())
731 bus_type = "PCI (type1)";
732 else if (pci_conf2() && probe_for_cmd640_pci2())
733 bus_type = "PCI (type2)";
734 else
735 return 0;
736 }
737 /*
738 * Undocumented magic (there is no 0x5b reg in specs)
739 */
740 put_cmd640_reg(0x5b, 0xbd);
741 if (get_cmd640_reg(0x5b) != 0xbd) {
742 printk(KERN_ERR "ide: cmd640 init failed: wrong value in reg 0x5b\n");
743 return 0;
744 }
745 put_cmd640_reg(0x5b, 0);
746
747#ifdef CMD640_DUMP_REGS
748 cmd640_dump_regs();
749#endif
750
751 /*
752 * Documented magic begins here
753 */
754 cfr = get_cmd640_reg(CFR);
755 cmd640_chip_version = cfr & CFR_DEVREV;
756 if (cmd640_chip_version == 0) {
757 printk ("ide: bad cmd640 revision: %d\n", cmd640_chip_version);
758 return 0;
759 }
760
761 /*
762 * Initialize data for primary port
763 */
764 setup_device_ptrs ();
765 printk("%s: buggy cmd640%c interface on %s, config=0x%02x\n",
766 cmd_hwif0->name, 'a' + cmd640_chip_version - 1, bus_type, cfr);
767 cmd_hwif0->chipset = ide_cmd640;
768#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
Bartlomiej Zolnierkiewicz4099d142007-07-20 01:11:59 +0200769 cmd_hwif0->pio_mask = ATA_PIO5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 cmd_hwif0->tuneproc = &cmd640_tune_drive;
771#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
772
773 /*
774 * Ensure compatibility by always using the slowest timings
775 * for access to the drive's command register block,
776 * and reset the prefetch burstsize to default (512 bytes).
777 *
778 * Maybe we need a way to NOT do these on *some* systems?
779 */
780 put_cmd640_reg(CMDTIM, 0);
781 put_cmd640_reg(BRST, 0x40);
782
783 /*
784 * Try to enable the secondary interface, if not already enabled
785 */
786 if (cmd_hwif1->noprobe) {
787 port2 = "not probed";
788 } else {
789 b = get_cmd640_reg(CNTRL);
790 if (secondary_port_responding()) {
791 if ((b & CNTRL_ENA_2ND)) {
792 second_port_cmd640 = 1;
793 port2 = "okay";
794 } else if (cmd640_vlb) {
795 second_port_cmd640 = 1;
796 port2 = "alive";
797 } else
798 port2 = "not cmd640";
799 } else {
800 put_cmd640_reg(CNTRL, b ^ CNTRL_ENA_2ND); /* toggle the bit */
801 if (secondary_port_responding()) {
802 second_port_cmd640 = 1;
803#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
804 second_port_toggled = 1;
805#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
806 port2 = "enabled";
807 } else {
808 put_cmd640_reg(CNTRL, b); /* restore original setting */
809 port2 = "not responding";
810 }
811 }
812 }
813
814 /*
815 * Initialize data for secondary cmd640 port, if enabled
816 */
817 if (second_port_cmd640) {
818 cmd_hwif0->serialized = 1;
819 cmd_hwif1->serialized = 1;
820 cmd_hwif1->chipset = ide_cmd640;
821 cmd_hwif0->mate = cmd_hwif1;
822 cmd_hwif1->mate = cmd_hwif0;
823 cmd_hwif1->channel = 1;
824#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
Bartlomiej Zolnierkiewicz4099d142007-07-20 01:11:59 +0200825 cmd_hwif1->pio_mask = ATA_PIO5;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 cmd_hwif1->tuneproc = &cmd640_tune_drive;
827#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
828 }
829 printk(KERN_INFO "%s: %sserialized, secondary interface %s\n", cmd_hwif1->name,
830 cmd_hwif0->serialized ? "" : "not ", port2);
831
832 /*
833 * Establish initial timings/prefetch for all drives.
834 * Do not unnecessarily disturb any prior BIOS setup of these.
835 */
836 for (index = 0; index < (2 + (second_port_cmd640 << 1)); index++) {
837 ide_drive_t *drive = cmd_drives[index];
838#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
839 if (drive->autotune || ((index > 1) && second_port_toggled)) {
840 /*
841 * Reset timing to the slowest speed and turn off prefetch.
842 * This way, the drive identify code has a better chance.
843 */
844 setup_counts [index] = 4; /* max possible */
845 active_counts [index] = 16; /* max possible */
846 recovery_counts [index] = 16; /* max possible */
847 program_drive_counts (index);
848 set_prefetch_mode (index, 0);
849 printk("cmd640: drive%d timings/prefetch cleared\n", index);
850 } else {
851 /*
852 * Record timings/prefetch without changing them.
853 * This preserves any prior BIOS setup.
854 */
855 retrieve_drive_counts (index);
856 check_prefetch (index);
857 printk("cmd640: drive%d timings/prefetch(%s) preserved",
858 index, drive->no_io_32bit ? "off" : "on");
859 display_clocks(index);
860 }
861#else
862 /*
863 * Set the drive unmask flags to match the prefetch setting
864 */
865 check_prefetch (index);
866 printk("cmd640: drive%d timings/prefetch(%s) preserved\n",
867 index, drive->no_io_32bit ? "off" : "on");
868#endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
869 }
870
871#ifdef CMD640_DUMP_REGS
872 cmd640_dump_regs();
873#endif
874 return 1;
875}
876