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1 | /* | |
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 | ||
101 | #undef REALLY_SLOW_IO /* most systems can safely undef this */ | |
102 | #define CMD640_PREFETCH_MASKS 1 | |
103 | ||
104 | //#define CMD640_DUMP_REGS | |
105 | ||
106 | #include <linux/config.h> | |
107 | #include <linux/types.h> | |
108 | #include <linux/kernel.h> | |
109 | #include <linux/delay.h> | |
110 | #include <linux/timer.h> | |
111 | #include <linux/mm.h> | |
112 | #include <linux/ioport.h> | |
113 | #include <linux/blkdev.h> | |
114 | #include <linux/hdreg.h> | |
115 | #include <linux/ide.h> | |
116 | #include <linux/init.h> | |
117 | ||
118 | #include <asm/io.h> | |
119 | ||
120 | /* | |
121 | * This flag is set in ide.c by the parameter: ide0=cmd640_vlb | |
122 | */ | |
123 | int cmd640_vlb = 0; | |
124 | ||
125 | /* | |
126 | * CMD640 specific registers definition. | |
127 | */ | |
128 | ||
129 | #define VID 0x00 | |
130 | #define DID 0x02 | |
131 | #define PCMD 0x04 | |
132 | #define PCMD_ENA 0x01 | |
133 | #define PSTTS 0x06 | |
134 | #define REVID 0x08 | |
135 | #define PROGIF 0x09 | |
136 | #define SUBCL 0x0a | |
137 | #define BASCL 0x0b | |
138 | #define BaseA0 0x10 | |
139 | #define BaseA1 0x14 | |
140 | #define BaseA2 0x18 | |
141 | #define BaseA3 0x1c | |
142 | #define INTLINE 0x3c | |
143 | #define INPINE 0x3d | |
144 | ||
145 | #define CFR 0x50 | |
146 | #define CFR_DEVREV 0x03 | |
147 | #define CFR_IDE01INTR 0x04 | |
148 | #define CFR_DEVID 0x18 | |
149 | #define CFR_AT_VESA_078h 0x20 | |
150 | #define CFR_DSA1 0x40 | |
151 | #define CFR_DSA0 0x80 | |
152 | ||
153 | #define CNTRL 0x51 | |
154 | #define CNTRL_DIS_RA0 0x40 | |
155 | #define CNTRL_DIS_RA1 0x80 | |
156 | #define CNTRL_ENA_2ND 0x08 | |
157 | ||
158 | #define CMDTIM 0x52 | |
159 | #define ARTTIM0 0x53 | |
160 | #define DRWTIM0 0x54 | |
161 | #define ARTTIM1 0x55 | |
162 | #define DRWTIM1 0x56 | |
163 | #define ARTTIM23 0x57 | |
164 | #define ARTTIM23_DIS_RA2 0x04 | |
165 | #define ARTTIM23_DIS_RA3 0x08 | |
166 | #define DRWTIM23 0x58 | |
167 | #define BRST 0x59 | |
168 | ||
169 | /* | |
170 | * Registers and masks for easy access by drive index: | |
171 | */ | |
172 | static u8 prefetch_regs[4] = {CNTRL, CNTRL, ARTTIM23, ARTTIM23}; | |
173 | static u8 prefetch_masks[4] = {CNTRL_DIS_RA0, CNTRL_DIS_RA1, ARTTIM23_DIS_RA2, ARTTIM23_DIS_RA3}; | |
174 | ||
175 | #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED | |
176 | ||
177 | static u8 arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23}; | |
178 | static u8 drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM23, DRWTIM23}; | |
179 | ||
180 | /* | |
181 | * Current cmd640 timing values for each drive. | |
182 | * The defaults for each are the slowest possible timings. | |
183 | */ | |
184 | static u8 setup_counts[4] = {4, 4, 4, 4}; /* Address setup count (in clocks) */ | |
185 | static u8 active_counts[4] = {16, 16, 16, 16}; /* Active count (encoded) */ | |
186 | static u8 recovery_counts[4] = {16, 16, 16, 16}; /* Recovery count (encoded) */ | |
187 | ||
188 | #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ | |
189 | ||
190 | /* | |
191 | * These are initialized to point at the devices we control | |
192 | */ | |
193 | static ide_hwif_t *cmd_hwif0, *cmd_hwif1; | |
194 | static ide_drive_t *cmd_drives[4]; | |
195 | ||
196 | /* | |
197 | * Interface to access cmd640x registers | |
198 | */ | |
199 | static unsigned int cmd640_key; | |
200 | static void (*__put_cmd640_reg)(u16 reg, u8 val); | |
201 | static u8 (*__get_cmd640_reg)(u16 reg); | |
202 | ||
203 | /* | |
204 | * This is read from the CFR reg, and is used in several places. | |
205 | */ | |
206 | static unsigned int cmd640_chip_version; | |
207 | ||
208 | /* | |
209 | * The CMD640x chip does not support DWORD config write cycles, but some | |
210 | * of the BIOSes use them to implement the config services. | |
211 | * Therefore, we must use direct IO instead. | |
212 | */ | |
213 | ||
214 | /* PCI method 1 access */ | |
215 | ||
216 | static void put_cmd640_reg_pci1 (u16 reg, u8 val) | |
217 | { | |
218 | outl_p((reg & 0xfc) | cmd640_key, 0xcf8); | |
219 | outb_p(val, (reg & 3) | 0xcfc); | |
220 | } | |
221 | ||
222 | static u8 get_cmd640_reg_pci1 (u16 reg) | |
223 | { | |
224 | outl_p((reg & 0xfc) | cmd640_key, 0xcf8); | |
225 | return inb_p((reg & 3) | 0xcfc); | |
226 | } | |
227 | ||
228 | /* PCI method 2 access (from CMD datasheet) */ | |
229 | ||
230 | static void put_cmd640_reg_pci2 (u16 reg, u8 val) | |
231 | { | |
232 | outb_p(0x10, 0xcf8); | |
233 | outb_p(val, cmd640_key + reg); | |
234 | outb_p(0, 0xcf8); | |
235 | } | |
236 | ||
237 | static u8 get_cmd640_reg_pci2 (u16 reg) | |
238 | { | |
239 | u8 b; | |
240 | ||
241 | outb_p(0x10, 0xcf8); | |
242 | b = inb_p(cmd640_key + reg); | |
243 | outb_p(0, 0xcf8); | |
244 | return b; | |
245 | } | |
246 | ||
247 | /* VLB access */ | |
248 | ||
249 | static void put_cmd640_reg_vlb (u16 reg, u8 val) | |
250 | { | |
251 | outb_p(reg, cmd640_key); | |
252 | outb_p(val, cmd640_key + 4); | |
253 | } | |
254 | ||
255 | static u8 get_cmd640_reg_vlb (u16 reg) | |
256 | { | |
257 | outb_p(reg, cmd640_key); | |
258 | return inb_p(cmd640_key + 4); | |
259 | } | |
260 | ||
261 | static u8 get_cmd640_reg(u16 reg) | |
262 | { | |
263 | u8 b; | |
264 | unsigned long flags; | |
265 | ||
266 | spin_lock_irqsave(&ide_lock, flags); | |
267 | b = __get_cmd640_reg(reg); | |
268 | spin_unlock_irqrestore(&ide_lock, flags); | |
269 | return b; | |
270 | } | |
271 | ||
272 | static void put_cmd640_reg(u16 reg, u8 val) | |
273 | { | |
274 | unsigned long flags; | |
275 | ||
276 | spin_lock_irqsave(&ide_lock, flags); | |
277 | __put_cmd640_reg(reg,val); | |
278 | spin_unlock_irqrestore(&ide_lock, flags); | |
279 | } | |
280 | ||
281 | static int __init match_pci_cmd640_device (void) | |
282 | { | |
283 | const u8 ven_dev[4] = {0x95, 0x10, 0x40, 0x06}; | |
284 | unsigned int i; | |
285 | for (i = 0; i < 4; i++) { | |
286 | if (get_cmd640_reg(i) != ven_dev[i]) | |
287 | return 0; | |
288 | } | |
289 | #ifdef STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT | |
290 | if ((get_cmd640_reg(PCMD) & PCMD_ENA) == 0) { | |
291 | printk("ide: cmd640 on PCI disabled by BIOS\n"); | |
292 | return 0; | |
293 | } | |
294 | #endif /* STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT */ | |
295 | return 1; /* success */ | |
296 | } | |
297 | ||
298 | /* | |
299 | * Probe for CMD640x -- pci method 1 | |
300 | */ | |
301 | static int __init probe_for_cmd640_pci1 (void) | |
302 | { | |
303 | __get_cmd640_reg = get_cmd640_reg_pci1; | |
304 | __put_cmd640_reg = put_cmd640_reg_pci1; | |
305 | for (cmd640_key = 0x80000000; | |
306 | cmd640_key <= 0x8000f800; | |
307 | cmd640_key += 0x800) { | |
308 | if (match_pci_cmd640_device()) | |
309 | return 1; /* success */ | |
310 | } | |
311 | return 0; | |
312 | } | |
313 | ||
314 | /* | |
315 | * Probe for CMD640x -- pci method 2 | |
316 | */ | |
317 | static int __init probe_for_cmd640_pci2 (void) | |
318 | { | |
319 | __get_cmd640_reg = get_cmd640_reg_pci2; | |
320 | __put_cmd640_reg = put_cmd640_reg_pci2; | |
321 | for (cmd640_key = 0xc000; cmd640_key <= 0xcf00; cmd640_key += 0x100) { | |
322 | if (match_pci_cmd640_device()) | |
323 | return 1; /* success */ | |
324 | } | |
325 | return 0; | |
326 | } | |
327 | ||
328 | /* | |
329 | * Probe for CMD640x -- vlb | |
330 | */ | |
331 | static int __init probe_for_cmd640_vlb (void) | |
332 | { | |
333 | u8 b; | |
334 | ||
335 | __get_cmd640_reg = get_cmd640_reg_vlb; | |
336 | __put_cmd640_reg = put_cmd640_reg_vlb; | |
337 | cmd640_key = 0x178; | |
338 | b = get_cmd640_reg(CFR); | |
339 | if (b == 0xff || b == 0x00 || (b & CFR_AT_VESA_078h)) { | |
340 | cmd640_key = 0x78; | |
341 | b = get_cmd640_reg(CFR); | |
342 | if (b == 0xff || b == 0x00 || !(b & CFR_AT_VESA_078h)) | |
343 | return 0; | |
344 | } | |
345 | return 1; /* success */ | |
346 | } | |
347 | ||
348 | /* | |
349 | * Returns 1 if an IDE interface/drive exists at 0x170, | |
350 | * Returns 0 otherwise. | |
351 | */ | |
352 | static int __init secondary_port_responding (void) | |
353 | { | |
354 | unsigned long flags; | |
355 | ||
356 | spin_lock_irqsave(&ide_lock, flags); | |
357 | ||
358 | outb_p(0x0a, 0x170 + IDE_SELECT_OFFSET); /* select drive0 */ | |
359 | udelay(100); | |
360 | if ((inb_p(0x170 + IDE_SELECT_OFFSET) & 0x1f) != 0x0a) { | |
361 | outb_p(0x1a, 0x170 + IDE_SELECT_OFFSET); /* select drive1 */ | |
362 | udelay(100); | |
363 | if ((inb_p(0x170 + IDE_SELECT_OFFSET) & 0x1f) != 0x1a) { | |
364 | spin_unlock_irqrestore(&ide_lock, flags); | |
365 | return 0; /* nothing responded */ | |
366 | } | |
367 | } | |
368 | spin_unlock_irqrestore(&ide_lock, flags); | |
369 | return 1; /* success */ | |
370 | } | |
371 | ||
372 | #ifdef CMD640_DUMP_REGS | |
373 | /* | |
374 | * Dump out all cmd640 registers. May be called from ide.c | |
375 | */ | |
376 | static void cmd640_dump_regs (void) | |
377 | { | |
378 | unsigned int reg = cmd640_vlb ? 0x50 : 0x00; | |
379 | ||
380 | /* Dump current state of chip registers */ | |
381 | printk("ide: cmd640 internal register dump:"); | |
382 | for (; reg <= 0x59; reg++) { | |
383 | if (!(reg & 0x0f)) | |
384 | printk("\n%04x:", reg); | |
385 | printk(" %02x", get_cmd640_reg(reg)); | |
386 | } | |
387 | printk("\n"); | |
388 | } | |
389 | #endif | |
390 | ||
391 | /* | |
392 | * Check whether prefetch is on for a drive, | |
393 | * and initialize the unmask flags for safe operation. | |
394 | */ | |
395 | static void __init check_prefetch (unsigned int index) | |
396 | { | |
397 | ide_drive_t *drive = cmd_drives[index]; | |
398 | u8 b = get_cmd640_reg(prefetch_regs[index]); | |
399 | ||
400 | if (b & prefetch_masks[index]) { /* is prefetch off? */ | |
401 | drive->no_unmask = 0; | |
402 | drive->no_io_32bit = 1; | |
403 | drive->io_32bit = 0; | |
404 | } else { | |
405 | #if CMD640_PREFETCH_MASKS | |
406 | drive->no_unmask = 1; | |
407 | drive->unmask = 0; | |
408 | #endif | |
409 | drive->no_io_32bit = 0; | |
410 | } | |
411 | } | |
412 | ||
413 | /* | |
414 | * Figure out which devices we control | |
415 | */ | |
416 | static void __init setup_device_ptrs (void) | |
417 | { | |
418 | unsigned int i; | |
419 | ||
420 | cmd_hwif0 = &ide_hwifs[0]; /* default, if not found below */ | |
421 | cmd_hwif1 = &ide_hwifs[1]; /* default, if not found below */ | |
422 | for (i = 0; i < MAX_HWIFS; i++) { | |
423 | ide_hwif_t *hwif = &ide_hwifs[i]; | |
424 | if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced) { | |
425 | if (hwif->io_ports[IDE_DATA_OFFSET] == 0x1f0) | |
426 | cmd_hwif0 = hwif; | |
427 | else if (hwif->io_ports[IDE_DATA_OFFSET] == 0x170) | |
428 | cmd_hwif1 = hwif; | |
429 | } | |
430 | } | |
431 | cmd_drives[0] = &cmd_hwif0->drives[0]; | |
432 | cmd_drives[1] = &cmd_hwif0->drives[1]; | |
433 | cmd_drives[2] = &cmd_hwif1->drives[0]; | |
434 | cmd_drives[3] = &cmd_hwif1->drives[1]; | |
435 | } | |
436 | ||
437 | #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED | |
438 | ||
439 | /* | |
440 | * Sets prefetch mode for a drive. | |
441 | */ | |
442 | static void set_prefetch_mode (unsigned int index, int mode) | |
443 | { | |
444 | ide_drive_t *drive = cmd_drives[index]; | |
445 | int reg = prefetch_regs[index]; | |
446 | u8 b; | |
447 | unsigned long flags; | |
448 | ||
449 | spin_lock_irqsave(&ide_lock, flags); | |
450 | b = __get_cmd640_reg(reg); | |
451 | if (mode) { /* want prefetch on? */ | |
452 | #if CMD640_PREFETCH_MASKS | |
453 | drive->no_unmask = 1; | |
454 | drive->unmask = 0; | |
455 | #endif | |
456 | drive->no_io_32bit = 0; | |
457 | b &= ~prefetch_masks[index]; /* enable prefetch */ | |
458 | } else { | |
459 | drive->no_unmask = 0; | |
460 | drive->no_io_32bit = 1; | |
461 | drive->io_32bit = 0; | |
462 | b |= prefetch_masks[index]; /* disable prefetch */ | |
463 | } | |
464 | __put_cmd640_reg(reg, b); | |
465 | spin_unlock_irqrestore(&ide_lock, flags); | |
466 | } | |
467 | ||
468 | /* | |
469 | * Dump out current drive clocks settings | |
470 | */ | |
471 | static void display_clocks (unsigned int index) | |
472 | { | |
473 | u8 active_count, recovery_count; | |
474 | ||
475 | active_count = active_counts[index]; | |
476 | if (active_count == 1) | |
477 | ++active_count; | |
478 | recovery_count = recovery_counts[index]; | |
479 | if (active_count > 3 && recovery_count == 1) | |
480 | ++recovery_count; | |
481 | if (cmd640_chip_version > 1) | |
482 | recovery_count += 1; /* cmd640b uses (count + 1)*/ | |
483 | printk(", clocks=%d/%d/%d\n", setup_counts[index], active_count, recovery_count); | |
484 | } | |
485 | ||
486 | /* | |
487 | * Pack active and recovery counts into single byte representation | |
488 | * used by controller | |
489 | */ | |
490 | static inline u8 pack_nibbles (u8 upper, u8 lower) | |
491 | { | |
492 | return ((upper & 0x0f) << 4) | (lower & 0x0f); | |
493 | } | |
494 | ||
495 | /* | |
496 | * This routine retrieves the initial drive timings from the chipset. | |
497 | */ | |
498 | static void __init retrieve_drive_counts (unsigned int index) | |
499 | { | |
500 | u8 b; | |
501 | ||
502 | /* | |
503 | * Get the internal setup timing, and convert to clock count | |
504 | */ | |
505 | b = get_cmd640_reg(arttim_regs[index]) & ~0x3f; | |
506 | switch (b) { | |
507 | case 0x00: b = 4; break; | |
508 | case 0x80: b = 3; break; | |
509 | case 0x40: b = 2; break; | |
510 | default: b = 5; break; | |
511 | } | |
512 | setup_counts[index] = b; | |
513 | ||
514 | /* | |
515 | * Get the active/recovery counts | |
516 | */ | |
517 | b = get_cmd640_reg(drwtim_regs[index]); | |
518 | active_counts[index] = (b >> 4) ? (b >> 4) : 0x10; | |
519 | recovery_counts[index] = (b & 0x0f) ? (b & 0x0f) : 0x10; | |
520 | } | |
521 | ||
522 | ||
523 | /* | |
524 | * This routine writes the prepared setup/active/recovery counts | |
525 | * for a drive into the cmd640 chipset registers to active them. | |
526 | */ | |
527 | static void program_drive_counts (unsigned int index) | |
528 | { | |
529 | unsigned long flags; | |
530 | u8 setup_count = setup_counts[index]; | |
531 | u8 active_count = active_counts[index]; | |
532 | u8 recovery_count = recovery_counts[index]; | |
533 | ||
534 | /* | |
535 | * Set up address setup count and drive read/write timing registers. | |
536 | * Primary interface has individual count/timing registers for | |
537 | * each drive. Secondary interface has one common set of registers, | |
538 | * so we merge the timings, using the slowest value for each timing. | |
539 | */ | |
540 | if (index > 1) { | |
541 | unsigned int mate; | |
542 | if (cmd_drives[mate = index ^ 1]->present) { | |
543 | if (setup_count < setup_counts[mate]) | |
544 | setup_count = setup_counts[mate]; | |
545 | if (active_count < active_counts[mate]) | |
546 | active_count = active_counts[mate]; | |
547 | if (recovery_count < recovery_counts[mate]) | |
548 | recovery_count = recovery_counts[mate]; | |
549 | } | |
550 | } | |
551 | ||
552 | /* | |
553 | * Convert setup_count to internal chipset representation | |
554 | */ | |
555 | switch (setup_count) { | |
556 | case 4: setup_count = 0x00; break; | |
557 | case 3: setup_count = 0x80; break; | |
558 | case 1: | |
559 | case 2: setup_count = 0x40; break; | |
560 | default: setup_count = 0xc0; /* case 5 */ | |
561 | } | |
562 | ||
563 | /* | |
564 | * Now that everything is ready, program the new timings | |
565 | */ | |
566 | spin_lock_irqsave(&ide_lock, flags); | |
567 | /* | |
568 | * Program the address_setup clocks into ARTTIM reg, | |
569 | * and then the active/recovery counts into the DRWTIM reg | |
570 | * (this converts counts of 16 into counts of zero -- okay). | |
571 | */ | |
572 | setup_count |= __get_cmd640_reg(arttim_regs[index]) & 0x3f; | |
573 | __put_cmd640_reg(arttim_regs[index], setup_count); | |
574 | __put_cmd640_reg(drwtim_regs[index], pack_nibbles(active_count, recovery_count)); | |
575 | spin_unlock_irqrestore(&ide_lock, flags); | |
576 | } | |
577 | ||
578 | /* | |
579 | * Set a specific pio_mode for a drive | |
580 | */ | |
581 | static void cmd640_set_mode (unsigned int index, u8 pio_mode, unsigned int cycle_time) | |
582 | { | |
583 | int setup_time, active_time, recovery_time, clock_time; | |
584 | u8 setup_count, active_count, recovery_count, recovery_count2, cycle_count; | |
585 | int bus_speed = system_bus_clock(); | |
586 | ||
587 | if (pio_mode > 5) | |
588 | pio_mode = 5; | |
589 | setup_time = ide_pio_timings[pio_mode].setup_time; | |
590 | active_time = ide_pio_timings[pio_mode].active_time; | |
591 | recovery_time = cycle_time - (setup_time + active_time); | |
592 | clock_time = 1000 / bus_speed; | |
593 | cycle_count = (cycle_time + clock_time - 1) / clock_time; | |
594 | ||
595 | setup_count = (setup_time + clock_time - 1) / clock_time; | |
596 | ||
597 | active_count = (active_time + clock_time - 1) / clock_time; | |
598 | if (active_count < 2) | |
599 | active_count = 2; /* minimum allowed by cmd640 */ | |
600 | ||
601 | recovery_count = (recovery_time + clock_time - 1) / clock_time; | |
602 | recovery_count2 = cycle_count - (setup_count + active_count); | |
603 | if (recovery_count2 > recovery_count) | |
604 | recovery_count = recovery_count2; | |
605 | if (recovery_count < 2) | |
606 | recovery_count = 2; /* minimum allowed by cmd640 */ | |
607 | if (recovery_count > 17) { | |
608 | active_count += recovery_count - 17; | |
609 | recovery_count = 17; | |
610 | } | |
611 | if (active_count > 16) | |
612 | active_count = 16; /* maximum allowed by cmd640 */ | |
613 | if (cmd640_chip_version > 1) | |
614 | recovery_count -= 1; /* cmd640b uses (count + 1)*/ | |
615 | if (recovery_count > 16) | |
616 | recovery_count = 16; /* maximum allowed by cmd640 */ | |
617 | ||
618 | setup_counts[index] = setup_count; | |
619 | active_counts[index] = active_count; | |
620 | recovery_counts[index] = recovery_count; | |
621 | ||
622 | /* | |
623 | * In a perfect world, we might set the drive pio mode here | |
624 | * (using WIN_SETFEATURE) before continuing. | |
625 | * | |
626 | * But we do not, because: | |
627 | * 1) this is the wrong place to do it (proper is do_special() in ide.c) | |
628 | * 2) in practice this is rarely, if ever, necessary | |
629 | */ | |
630 | program_drive_counts (index); | |
631 | } | |
632 | ||
633 | /* | |
634 | * Drive PIO mode selection: | |
635 | */ | |
636 | static void cmd640_tune_drive (ide_drive_t *drive, u8 mode_wanted) | |
637 | { | |
638 | u8 b; | |
639 | ide_pio_data_t d; | |
640 | unsigned int index = 0; | |
641 | ||
642 | while (drive != cmd_drives[index]) { | |
643 | if (++index > 3) { | |
644 | printk("%s: bad news in cmd640_tune_drive\n", drive->name); | |
645 | return; | |
646 | } | |
647 | } | |
648 | switch (mode_wanted) { | |
649 | case 6: /* set fast-devsel off */ | |
650 | case 7: /* set fast-devsel on */ | |
651 | mode_wanted &= 1; | |
652 | b = get_cmd640_reg(CNTRL) & ~0x27; | |
653 | if (mode_wanted) | |
654 | b |= 0x27; | |
655 | put_cmd640_reg(CNTRL, b); | |
656 | printk("%s: %sabled cmd640 fast host timing (devsel)\n", drive->name, mode_wanted ? "en" : "dis"); | |
657 | return; | |
658 | ||
659 | case 8: /* set prefetch off */ | |
660 | case 9: /* set prefetch on */ | |
661 | mode_wanted &= 1; | |
662 | set_prefetch_mode(index, mode_wanted); | |
663 | printk("%s: %sabled cmd640 prefetch\n", drive->name, mode_wanted ? "en" : "dis"); | |
664 | return; | |
665 | } | |
666 | ||
667 | (void) ide_get_best_pio_mode (drive, mode_wanted, 5, &d); | |
668 | cmd640_set_mode (index, d.pio_mode, d.cycle_time); | |
669 | ||
670 | printk ("%s: selected cmd640 PIO mode%d (%dns)%s", | |
671 | drive->name, | |
672 | d.pio_mode, | |
673 | d.cycle_time, | |
674 | d.overridden ? " (overriding vendor mode)" : ""); | |
675 | display_clocks(index); | |
676 | return; | |
677 | } | |
678 | ||
679 | #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ | |
680 | ||
681 | static int pci_conf1(void) | |
682 | { | |
683 | u32 tmp; | |
684 | unsigned long flags; | |
685 | ||
686 | spin_lock_irqsave(&ide_lock, flags); | |
687 | outb(0x01, 0xCFB); | |
688 | tmp = inl(0xCF8); | |
689 | outl(0x80000000, 0xCF8); | |
690 | if (inl(0xCF8) == 0x80000000) { | |
691 | outl(tmp, 0xCF8); | |
692 | spin_unlock_irqrestore(&ide_lock, flags); | |
693 | return 1; | |
694 | } | |
695 | outl(tmp, 0xCF8); | |
696 | spin_unlock_irqrestore(&ide_lock, flags); | |
697 | return 0; | |
698 | } | |
699 | ||
700 | static int pci_conf2(void) | |
701 | { | |
702 | unsigned long flags; | |
703 | ||
704 | spin_lock_irqsave(&ide_lock, flags); | |
705 | outb(0x00, 0xCFB); | |
706 | outb(0x00, 0xCF8); | |
707 | outb(0x00, 0xCFA); | |
708 | if (inb(0xCF8) == 0x00 && inb(0xCF8) == 0x00) { | |
709 | spin_unlock_irqrestore(&ide_lock, flags); | |
710 | return 1; | |
711 | } | |
712 | spin_unlock_irqrestore(&ide_lock, flags); | |
713 | return 0; | |
714 | } | |
715 | ||
716 | /* | |
717 | * Probe for a cmd640 chipset, and initialize it if found. Called from ide.c | |
718 | */ | |
719 | int __init ide_probe_for_cmd640x (void) | |
720 | { | |
721 | #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED | |
722 | int second_port_toggled = 0; | |
723 | #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ | |
724 | int second_port_cmd640 = 0; | |
725 | const char *bus_type, *port2; | |
726 | unsigned int index; | |
727 | u8 b, cfr; | |
728 | ||
729 | if (cmd640_vlb && probe_for_cmd640_vlb()) { | |
730 | bus_type = "VLB"; | |
731 | } else { | |
732 | cmd640_vlb = 0; | |
733 | /* Find out what kind of PCI probing is supported otherwise | |
734 | Justin Gibbs will sulk.. */ | |
735 | if (pci_conf1() && probe_for_cmd640_pci1()) | |
736 | bus_type = "PCI (type1)"; | |
737 | else if (pci_conf2() && probe_for_cmd640_pci2()) | |
738 | bus_type = "PCI (type2)"; | |
739 | else | |
740 | return 0; | |
741 | } | |
742 | /* | |
743 | * Undocumented magic (there is no 0x5b reg in specs) | |
744 | */ | |
745 | put_cmd640_reg(0x5b, 0xbd); | |
746 | if (get_cmd640_reg(0x5b) != 0xbd) { | |
747 | printk(KERN_ERR "ide: cmd640 init failed: wrong value in reg 0x5b\n"); | |
748 | return 0; | |
749 | } | |
750 | put_cmd640_reg(0x5b, 0); | |
751 | ||
752 | #ifdef CMD640_DUMP_REGS | |
753 | cmd640_dump_regs(); | |
754 | #endif | |
755 | ||
756 | /* | |
757 | * Documented magic begins here | |
758 | */ | |
759 | cfr = get_cmd640_reg(CFR); | |
760 | cmd640_chip_version = cfr & CFR_DEVREV; | |
761 | if (cmd640_chip_version == 0) { | |
762 | printk ("ide: bad cmd640 revision: %d\n", cmd640_chip_version); | |
763 | return 0; | |
764 | } | |
765 | ||
766 | /* | |
767 | * Initialize data for primary port | |
768 | */ | |
769 | setup_device_ptrs (); | |
770 | printk("%s: buggy cmd640%c interface on %s, config=0x%02x\n", | |
771 | cmd_hwif0->name, 'a' + cmd640_chip_version - 1, bus_type, cfr); | |
772 | cmd_hwif0->chipset = ide_cmd640; | |
773 | #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED | |
774 | cmd_hwif0->tuneproc = &cmd640_tune_drive; | |
775 | #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ | |
776 | ||
777 | /* | |
778 | * Ensure compatibility by always using the slowest timings | |
779 | * for access to the drive's command register block, | |
780 | * and reset the prefetch burstsize to default (512 bytes). | |
781 | * | |
782 | * Maybe we need a way to NOT do these on *some* systems? | |
783 | */ | |
784 | put_cmd640_reg(CMDTIM, 0); | |
785 | put_cmd640_reg(BRST, 0x40); | |
786 | ||
787 | /* | |
788 | * Try to enable the secondary interface, if not already enabled | |
789 | */ | |
790 | if (cmd_hwif1->noprobe) { | |
791 | port2 = "not probed"; | |
792 | } else { | |
793 | b = get_cmd640_reg(CNTRL); | |
794 | if (secondary_port_responding()) { | |
795 | if ((b & CNTRL_ENA_2ND)) { | |
796 | second_port_cmd640 = 1; | |
797 | port2 = "okay"; | |
798 | } else if (cmd640_vlb) { | |
799 | second_port_cmd640 = 1; | |
800 | port2 = "alive"; | |
801 | } else | |
802 | port2 = "not cmd640"; | |
803 | } else { | |
804 | put_cmd640_reg(CNTRL, b ^ CNTRL_ENA_2ND); /* toggle the bit */ | |
805 | if (secondary_port_responding()) { | |
806 | second_port_cmd640 = 1; | |
807 | #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED | |
808 | second_port_toggled = 1; | |
809 | #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ | |
810 | port2 = "enabled"; | |
811 | } else { | |
812 | put_cmd640_reg(CNTRL, b); /* restore original setting */ | |
813 | port2 = "not responding"; | |
814 | } | |
815 | } | |
816 | } | |
817 | ||
818 | /* | |
819 | * Initialize data for secondary cmd640 port, if enabled | |
820 | */ | |
821 | if (second_port_cmd640) { | |
822 | cmd_hwif0->serialized = 1; | |
823 | cmd_hwif1->serialized = 1; | |
824 | cmd_hwif1->chipset = ide_cmd640; | |
825 | cmd_hwif0->mate = cmd_hwif1; | |
826 | cmd_hwif1->mate = cmd_hwif0; | |
827 | cmd_hwif1->channel = 1; | |
828 | #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED | |
829 | cmd_hwif1->tuneproc = &cmd640_tune_drive; | |
830 | #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ | |
831 | } | |
832 | printk(KERN_INFO "%s: %sserialized, secondary interface %s\n", cmd_hwif1->name, | |
833 | cmd_hwif0->serialized ? "" : "not ", port2); | |
834 | ||
835 | /* | |
836 | * Establish initial timings/prefetch for all drives. | |
837 | * Do not unnecessarily disturb any prior BIOS setup of these. | |
838 | */ | |
839 | for (index = 0; index < (2 + (second_port_cmd640 << 1)); index++) { | |
840 | ide_drive_t *drive = cmd_drives[index]; | |
841 | #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED | |
842 | if (drive->autotune || ((index > 1) && second_port_toggled)) { | |
843 | /* | |
844 | * Reset timing to the slowest speed and turn off prefetch. | |
845 | * This way, the drive identify code has a better chance. | |
846 | */ | |
847 | setup_counts [index] = 4; /* max possible */ | |
848 | active_counts [index] = 16; /* max possible */ | |
849 | recovery_counts [index] = 16; /* max possible */ | |
850 | program_drive_counts (index); | |
851 | set_prefetch_mode (index, 0); | |
852 | printk("cmd640: drive%d timings/prefetch cleared\n", index); | |
853 | } else { | |
854 | /* | |
855 | * Record timings/prefetch without changing them. | |
856 | * This preserves any prior BIOS setup. | |
857 | */ | |
858 | retrieve_drive_counts (index); | |
859 | check_prefetch (index); | |
860 | printk("cmd640: drive%d timings/prefetch(%s) preserved", | |
861 | index, drive->no_io_32bit ? "off" : "on"); | |
862 | display_clocks(index); | |
863 | } | |
864 | #else | |
865 | /* | |
866 | * Set the drive unmask flags to match the prefetch setting | |
867 | */ | |
868 | check_prefetch (index); | |
869 | printk("cmd640: drive%d timings/prefetch(%s) preserved\n", | |
870 | index, drive->no_io_32bit ? "off" : "on"); | |
871 | #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ | |
872 | } | |
873 | ||
874 | #ifdef CMD640_DUMP_REGS | |
875 | cmd640_dump_regs(); | |
876 | #endif | |
877 | return 1; | |
878 | } | |
879 |