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1da177e4 LT |
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 | ||
1da177e4 LT |
101 | #define CMD640_PREFETCH_MASKS 1 |
102 | ||
103 | //#define CMD640_DUMP_REGS | |
104 | ||
1da177e4 LT |
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 <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 | */ | |
121 | int 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 | */ | |
170 | static u8 prefetch_regs[4] = {CNTRL, CNTRL, ARTTIM23, ARTTIM23}; | |
171 | static 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 | ||
175 | static u8 arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23}; | |
176 | static 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 | */ | |
182 | static u8 setup_counts[4] = {4, 4, 4, 4}; /* Address setup count (in clocks) */ | |
183 | static u8 active_counts[4] = {16, 16, 16, 16}; /* Active count (encoded) */ | |
184 | static 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 | */ | |
191 | static ide_hwif_t *cmd_hwif0, *cmd_hwif1; | |
192 | static ide_drive_t *cmd_drives[4]; | |
193 | ||
194 | /* | |
195 | * Interface to access cmd640x registers | |
196 | */ | |
197 | static unsigned int cmd640_key; | |
198 | static void (*__put_cmd640_reg)(u16 reg, u8 val); | |
199 | static u8 (*__get_cmd640_reg)(u16 reg); | |
200 | ||
201 | /* | |
202 | * This is read from the CFR reg, and is used in several places. | |
203 | */ | |
204 | static 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 | ||
214 | static 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 | ||
220 | static 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 | ||
228 | static 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 | ||
235 | static 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 | ||
247 | static 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 | ||
253 | static u8 get_cmd640_reg_vlb (u16 reg) | |
254 | { | |
255 | outb_p(reg, cmd640_key); | |
256 | return inb_p(cmd640_key + 4); | |
257 | } | |
258 | ||
259 | static 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 | ||
270 | static 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 | ||
279 | static 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 | */ | |
299 | static 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 | */ | |
315 | static 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 | */ | |
329 | static 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 | */ | |
350 | static 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 | */ | |
374 | static 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 | */ | |
393 | static 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 | */ | |
414 | static 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 | */ | |
440 | static 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 | */ | |
469 | static 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 | */ | |
77933d72 | 488 | static inline u8 pack_nibbles (u8 upper, u8 lower) |
1da177e4 LT |
489 | { |
490 | return ((upper & 0x0f) << 4) | (lower & 0x0f); | |
491 | } | |
492 | ||
493 | /* | |
494 | * This routine retrieves the initial drive timings from the chipset. | |
495 | */ | |
496 | static 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 | */ | |
525 | static 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 | */ | |
579 | static 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 | */ | |
634 | static void cmd640_tune_drive (ide_drive_t *drive, u8 mode_wanted) | |
635 | { | |
7dd00083 | 636 | unsigned int index = 0, cycle_time; |
1da177e4 | 637 | u8 b; |
1da177e4 LT |
638 | |
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 | ||
2134758d | 664 | mode_wanted = ide_get_best_pio_mode(drive, mode_wanted, 5); |
7dd00083 BZ |
665 | cycle_time = ide_pio_cycle_time(drive, mode_wanted); |
666 | cmd640_set_mode(index, mode_wanted, cycle_time); | |
1da177e4 | 667 | |
342cdb6d | 668 | printk("%s: selected cmd640 PIO mode%d (%dns)", |
7dd00083 | 669 | drive->name, mode_wanted, cycle_time); |
342cdb6d | 670 | |
1da177e4 | 671 | display_clocks(index); |
1da177e4 LT |
672 | } |
673 | ||
674 | #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ | |
675 | ||
676 | static 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 | ||
695 | static 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 | */ | |
714 | int __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 | |
769 | cmd_hwif0->tuneproc = &cmd640_tune_drive; | |
770 | #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ | |
771 | ||
772 | /* | |
773 | * Ensure compatibility by always using the slowest timings | |
774 | * for access to the drive's command register block, | |
775 | * and reset the prefetch burstsize to default (512 bytes). | |
776 | * | |
777 | * Maybe we need a way to NOT do these on *some* systems? | |
778 | */ | |
779 | put_cmd640_reg(CMDTIM, 0); | |
780 | put_cmd640_reg(BRST, 0x40); | |
781 | ||
782 | /* | |
783 | * Try to enable the secondary interface, if not already enabled | |
784 | */ | |
785 | if (cmd_hwif1->noprobe) { | |
786 | port2 = "not probed"; | |
787 | } else { | |
788 | b = get_cmd640_reg(CNTRL); | |
789 | if (secondary_port_responding()) { | |
790 | if ((b & CNTRL_ENA_2ND)) { | |
791 | second_port_cmd640 = 1; | |
792 | port2 = "okay"; | |
793 | } else if (cmd640_vlb) { | |
794 | second_port_cmd640 = 1; | |
795 | port2 = "alive"; | |
796 | } else | |
797 | port2 = "not cmd640"; | |
798 | } else { | |
799 | put_cmd640_reg(CNTRL, b ^ CNTRL_ENA_2ND); /* toggle the bit */ | |
800 | if (secondary_port_responding()) { | |
801 | second_port_cmd640 = 1; | |
802 | #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED | |
803 | second_port_toggled = 1; | |
804 | #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ | |
805 | port2 = "enabled"; | |
806 | } else { | |
807 | put_cmd640_reg(CNTRL, b); /* restore original setting */ | |
808 | port2 = "not responding"; | |
809 | } | |
810 | } | |
811 | } | |
812 | ||
813 | /* | |
814 | * Initialize data for secondary cmd640 port, if enabled | |
815 | */ | |
816 | if (second_port_cmd640) { | |
817 | cmd_hwif0->serialized = 1; | |
818 | cmd_hwif1->serialized = 1; | |
819 | cmd_hwif1->chipset = ide_cmd640; | |
820 | cmd_hwif0->mate = cmd_hwif1; | |
821 | cmd_hwif1->mate = cmd_hwif0; | |
822 | cmd_hwif1->channel = 1; | |
823 | #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED | |
824 | cmd_hwif1->tuneproc = &cmd640_tune_drive; | |
825 | #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ | |
826 | } | |
827 | printk(KERN_INFO "%s: %sserialized, secondary interface %s\n", cmd_hwif1->name, | |
828 | cmd_hwif0->serialized ? "" : "not ", port2); | |
829 | ||
830 | /* | |
831 | * Establish initial timings/prefetch for all drives. | |
832 | * Do not unnecessarily disturb any prior BIOS setup of these. | |
833 | */ | |
834 | for (index = 0; index < (2 + (second_port_cmd640 << 1)); index++) { | |
835 | ide_drive_t *drive = cmd_drives[index]; | |
836 | #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED | |
837 | if (drive->autotune || ((index > 1) && second_port_toggled)) { | |
838 | /* | |
839 | * Reset timing to the slowest speed and turn off prefetch. | |
840 | * This way, the drive identify code has a better chance. | |
841 | */ | |
842 | setup_counts [index] = 4; /* max possible */ | |
843 | active_counts [index] = 16; /* max possible */ | |
844 | recovery_counts [index] = 16; /* max possible */ | |
845 | program_drive_counts (index); | |
846 | set_prefetch_mode (index, 0); | |
847 | printk("cmd640: drive%d timings/prefetch cleared\n", index); | |
848 | } else { | |
849 | /* | |
850 | * Record timings/prefetch without changing them. | |
851 | * This preserves any prior BIOS setup. | |
852 | */ | |
853 | retrieve_drive_counts (index); | |
854 | check_prefetch (index); | |
855 | printk("cmd640: drive%d timings/prefetch(%s) preserved", | |
856 | index, drive->no_io_32bit ? "off" : "on"); | |
857 | display_clocks(index); | |
858 | } | |
859 | #else | |
860 | /* | |
861 | * Set the drive unmask flags to match the prefetch setting | |
862 | */ | |
863 | check_prefetch (index); | |
864 | printk("cmd640: drive%d timings/prefetch(%s) preserved\n", | |
865 | index, drive->no_io_32bit ? "off" : "on"); | |
866 | #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */ | |
867 | } | |
868 | ||
869 | #ifdef CMD640_DUMP_REGS | |
870 | cmd640_dump_regs(); | |
871 | #endif | |
872 | return 1; | |
873 | } | |
874 |