Merge commit 'v2.6.26' into bkl-removal
[linux-2.6] / drivers / ide / pci / cmd640.c
1 /*
2  *  Copyright (C) 1995-1996  Linus Torvalds & authors (see below)
3  */
4
5 /*
6  *  Original authors:   abramov@cecmow.enet.dec.com (Igor Abramov)
7  *                      mlord@pobox.com (Mark Lord)
8  *
9  *  See linux/MAINTAINERS for address of current maintainer.
10  *
11  *  This file provides support for the advanced features and bugs
12  *  of IDE interfaces using the CMD Technologies 0640 IDE interface chip.
13  *
14  *  These chips are basically fucked by design, and getting this driver
15  *  to work on every motherboard design that uses this screwed chip seems
16  *  bloody well impossible.  However, we're still trying.
17  *
18  *  Version 0.97 worked for everybody.
19  *
20  *  User feedback is essential.  Many thanks to the beta test team:
21  *
22  *  A.Hartgers@stud.tue.nl, JZDQC@CUNYVM.CUNY.edu, abramov@cecmow.enet.dec.com,
23  *  bardj@utopia.ppp.sn.no, bart@gaga.tue.nl, bbol001@cs.auckland.ac.nz,
24  *  chrisc@dbass.demon.co.uk, dalecki@namu26.Num.Math.Uni-Goettingen.de,
25  *  derekn@vw.ece.cmu.edu, florian@btp2x3.phy.uni-bayreuth.de,
26  *  flynn@dei.unipd.it, gadio@netvision.net.il, godzilla@futuris.net,
27  *  j@pobox.com, jkemp1@mises.uni-paderborn.de, jtoppe@hiwaay.net,
28  *  kerouac@ssnet.com, meskes@informatik.rwth-aachen.de, hzoli@cs.elte.hu,
29  *  peter@udgaard.isgtec.com, phil@tazenda.demon.co.uk, roadcapw@cfw.com,
30  *  s0033las@sun10.vsz.bme.hu, schaffer@tam.cornell.edu, sjd@slip.net,
31  *  steve@ei.org, ulrpeg@bigcomm.gun.de, ism@tardis.ed.ac.uk, mack@cray.com
32  *  liug@mama.indstate.edu, and others.
33  *
34  *  Version 0.01        Initial version, hacked out of ide.c,
35  *                      and #include'd rather than compiled separately.
36  *                      This will get cleaned up in a subsequent release.
37  *
38  *  Version 0.02        Fixes for vlb initialization code, enable prefetch
39  *                      for versions 'B' and 'C' of chip by default,
40  *                      some code cleanup.
41  *
42  *  Version 0.03        Added reset of secondary interface,
43  *                      and black list for devices which are not compatible
44  *                      with prefetch mode. Separate function for setting
45  *                      prefetch is added, possibly it will be called some
46  *                      day from ioctl processing code.
47  *
48  *  Version 0.04        Now configs/compiles separate from ide.c
49  *
50  *  Version 0.05        Major rewrite of interface timing code.
51  *                      Added new function cmd640_set_mode to set PIO mode
52  *                      from ioctl call. New drives added to black list.
53  *
54  *  Version 0.06        More code cleanup. Prefetch is enabled only for
55  *                      detected hard drives, not included in prefetch
56  *                      black list.
57  *
58  *  Version 0.07        Changed to more conservative drive tuning policy.
59  *                      Unknown drives, which report PIO < 4 are set to
60  *                      (reported_PIO - 1) if it is supported, or to PIO0.
61  *                      List of known drives extended by info provided by
62  *                      CMD at their ftp site.
63  *
64  *  Version 0.08        Added autotune/noautotune support.
65  *
66  *  Version 0.09        Try to be smarter about 2nd port enabling.
67  *  Version 0.10        Be nice and don't reset 2nd port.
68  *  Version 0.11        Try to handle more weird situations.
69  *
70  *  Version 0.12        Lots of bug fixes from Laszlo Peter
71  *                      irq unmasking disabled for reliability.
72  *                      try to be even smarter about the second port.
73  *                      tidy up source code formatting.
74  *  Version 0.13        permit irq unmasking again.
75  *  Version 0.90        massive code cleanup, some bugs fixed.
76  *                      defaults all drives to PIO mode0, prefetch off.
77  *                      autotune is OFF by default, with compile time flag.
78  *                      prefetch can be turned OFF/ON using "hdparm -p8/-p9"
79  *                       (requires hdparm-3.1 or newer)
80  *  Version 0.91        first release to linux-kernel list.
81  *  Version 0.92        move initial reg dump to separate callable function
82  *                      change "readahead" to "prefetch" to avoid confusion
83  *  Version 0.95        respect original BIOS timings unless autotuning.
84  *                      tons of code cleanup and rearrangement.
85  *                      added CONFIG_BLK_DEV_CMD640_ENHANCED option
86  *                      prevent use of unmask when prefetch is on
87  *  Version 0.96        prevent use of io_32bit when prefetch is off
88  *  Version 0.97        fix VLB secondary interface for sjd@slip.net
89  *                      other minor tune-ups:  0.96 was very good.
90  *  Version 0.98        ignore PCI version when disabled by BIOS
91  *  Version 0.99        display setup/active/recovery clocks with PIO mode
92  *  Version 1.00        Mmm.. cannot depend on PCMD_ENA in all systems
93  *  Version 1.01        slow/fast devsel can be selected with "hdparm -p6/-p7"
94  *                       ("fast" is necessary for 32bit I/O in some systems)
95  *  Version 1.02        fix bug that resulted in slow "setup times"
96  *                       (patch courtesy of Zoltan Hidvegi)
97  */
98
99 #define CMD640_PREFETCH_MASKS 1
100
101 /*#define CMD640_DUMP_REGS */
102
103 #include <linux/types.h>
104 #include <linux/kernel.h>
105 #include <linux/delay.h>
106 #include <linux/hdreg.h>
107 #include <linux/ide.h>
108 #include <linux/init.h>
109
110 #include <asm/io.h>
111
112 #define DRV_NAME "cmd640"
113
114 static int cmd640_vlb;
115
116 /*
117  * CMD640 specific registers definition.
118  */
119
120 #define VID             0x00
121 #define DID             0x02
122 #define PCMD            0x04
123 #define   PCMD_ENA      0x01
124 #define PSTTS           0x06
125 #define REVID           0x08
126 #define PROGIF          0x09
127 #define SUBCL           0x0a
128 #define BASCL           0x0b
129 #define BaseA0          0x10
130 #define BaseA1          0x14
131 #define BaseA2          0x18
132 #define BaseA3          0x1c
133 #define INTLINE         0x3c
134 #define INPINE          0x3d
135
136 #define CFR             0x50
137 #define   CFR_DEVREV            0x03
138 #define   CFR_IDE01INTR         0x04
139 #define   CFR_DEVID             0x18
140 #define   CFR_AT_VESA_078h      0x20
141 #define   CFR_DSA1              0x40
142 #define   CFR_DSA0              0x80
143
144 #define CNTRL           0x51
145 #define   CNTRL_DIS_RA0         0x40
146 #define   CNTRL_DIS_RA1         0x80
147 #define   CNTRL_ENA_2ND         0x08
148
149 #define CMDTIM          0x52
150 #define ARTTIM0         0x53
151 #define DRWTIM0         0x54
152 #define ARTTIM1         0x55
153 #define DRWTIM1         0x56
154 #define ARTTIM23        0x57
155 #define   ARTTIM23_DIS_RA2      0x04
156 #define   ARTTIM23_DIS_RA3      0x08
157 #define DRWTIM23        0x58
158 #define BRST            0x59
159
160 /*
161  * Registers and masks for easy access by drive index:
162  */
163 static u8 prefetch_regs[4]  = {CNTRL, CNTRL, ARTTIM23, ARTTIM23};
164 static u8 prefetch_masks[4] = {CNTRL_DIS_RA0, CNTRL_DIS_RA1, ARTTIM23_DIS_RA2, ARTTIM23_DIS_RA3};
165
166 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
167
168 static u8 arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23};
169 static u8 drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM23, DRWTIM23};
170
171 /*
172  * Current cmd640 timing values for each drive.
173  * The defaults for each are the slowest possible timings.
174  */
175 static u8 setup_counts[4]    = {4, 4, 4, 4};     /* Address setup count (in clocks) */
176 static u8 active_counts[4]   = {16, 16, 16, 16}; /* Active count   (encoded) */
177 static u8 recovery_counts[4] = {16, 16, 16, 16}; /* Recovery count (encoded) */
178
179 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
180
181 static DEFINE_SPINLOCK(cmd640_lock);
182
183 /*
184  * These are initialized to point at the devices we control
185  */
186 static ide_hwif_t  *cmd_hwif0, *cmd_hwif1;
187
188 /*
189  * Interface to access cmd640x registers
190  */
191 static unsigned int cmd640_key;
192 static void (*__put_cmd640_reg)(u16 reg, u8 val);
193 static u8 (*__get_cmd640_reg)(u16 reg);
194
195 /*
196  * This is read from the CFR reg, and is used in several places.
197  */
198 static unsigned int cmd640_chip_version;
199
200 /*
201  * The CMD640x chip does not support DWORD config write cycles, but some
202  * of the BIOSes use them to implement the config services.
203  * Therefore, we must use direct IO instead.
204  */
205
206 /* PCI method 1 access */
207
208 static void put_cmd640_reg_pci1(u16 reg, u8 val)
209 {
210         outl_p((reg & 0xfc) | cmd640_key, 0xcf8);
211         outb_p(val, (reg & 3) | 0xcfc);
212 }
213
214 static u8 get_cmd640_reg_pci1(u16 reg)
215 {
216         outl_p((reg & 0xfc) | cmd640_key, 0xcf8);
217         return inb_p((reg & 3) | 0xcfc);
218 }
219
220 /* PCI method 2 access (from CMD datasheet) */
221
222 static void put_cmd640_reg_pci2(u16 reg, u8 val)
223 {
224         outb_p(0x10, 0xcf8);
225         outb_p(val, cmd640_key + reg);
226         outb_p(0, 0xcf8);
227 }
228
229 static u8 get_cmd640_reg_pci2(u16 reg)
230 {
231         u8 b;
232
233         outb_p(0x10, 0xcf8);
234         b = inb_p(cmd640_key + reg);
235         outb_p(0, 0xcf8);
236         return b;
237 }
238
239 /* VLB access */
240
241 static void put_cmd640_reg_vlb(u16 reg, u8 val)
242 {
243         outb_p(reg, cmd640_key);
244         outb_p(val, cmd640_key + 4);
245 }
246
247 static u8 get_cmd640_reg_vlb(u16 reg)
248 {
249         outb_p(reg, cmd640_key);
250         return inb_p(cmd640_key + 4);
251 }
252
253 static u8 get_cmd640_reg(u16 reg)
254 {
255         unsigned long flags;
256         u8 b;
257
258         spin_lock_irqsave(&cmd640_lock, flags);
259         b = __get_cmd640_reg(reg);
260         spin_unlock_irqrestore(&cmd640_lock, flags);
261         return b;
262 }
263
264 static void put_cmd640_reg(u16 reg, u8 val)
265 {
266         unsigned long flags;
267
268         spin_lock_irqsave(&cmd640_lock, flags);
269         __put_cmd640_reg(reg, val);
270         spin_unlock_irqrestore(&cmd640_lock, flags);
271 }
272
273 static int __init match_pci_cmd640_device(void)
274 {
275         const u8 ven_dev[4] = {0x95, 0x10, 0x40, 0x06};
276         unsigned int i;
277         for (i = 0; i < 4; i++) {
278                 if (get_cmd640_reg(i) != ven_dev[i])
279                         return 0;
280         }
281 #ifdef STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT
282         if ((get_cmd640_reg(PCMD) & PCMD_ENA) == 0) {
283                 printk("ide: cmd640 on PCI disabled by BIOS\n");
284                 return 0;
285         }
286 #endif /* STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT */
287         return 1; /* success */
288 }
289
290 /*
291  * Probe for CMD640x -- pci method 1
292  */
293 static int __init probe_for_cmd640_pci1(void)
294 {
295         __get_cmd640_reg = get_cmd640_reg_pci1;
296         __put_cmd640_reg = put_cmd640_reg_pci1;
297         for (cmd640_key = 0x80000000;
298              cmd640_key <= 0x8000f800;
299              cmd640_key += 0x800) {
300                 if (match_pci_cmd640_device())
301                         return 1; /* success */
302         }
303         return 0;
304 }
305
306 /*
307  * Probe for CMD640x -- pci method 2
308  */
309 static int __init probe_for_cmd640_pci2(void)
310 {
311         __get_cmd640_reg = get_cmd640_reg_pci2;
312         __put_cmd640_reg = put_cmd640_reg_pci2;
313         for (cmd640_key = 0xc000; cmd640_key <= 0xcf00; cmd640_key += 0x100) {
314                 if (match_pci_cmd640_device())
315                         return 1; /* success */
316         }
317         return 0;
318 }
319
320 /*
321  * Probe for CMD640x -- vlb
322  */
323 static int __init probe_for_cmd640_vlb(void)
324 {
325         u8 b;
326
327         __get_cmd640_reg = get_cmd640_reg_vlb;
328         __put_cmd640_reg = put_cmd640_reg_vlb;
329         cmd640_key = 0x178;
330         b = get_cmd640_reg(CFR);
331         if (b == 0xff || b == 0x00 || (b & CFR_AT_VESA_078h)) {
332                 cmd640_key = 0x78;
333                 b = get_cmd640_reg(CFR);
334                 if (b == 0xff || b == 0x00 || !(b & CFR_AT_VESA_078h))
335                         return 0;
336         }
337         return 1; /* success */
338 }
339
340 /*
341  *  Returns 1 if an IDE interface/drive exists at 0x170,
342  *  Returns 0 otherwise.
343  */
344 static int __init secondary_port_responding(void)
345 {
346         unsigned long flags;
347
348         spin_lock_irqsave(&cmd640_lock, flags);
349
350         outb_p(0x0a, 0x176);    /* select drive0 */
351         udelay(100);
352         if ((inb_p(0x176) & 0x1f) != 0x0a) {
353                 outb_p(0x1a, 0x176); /* select drive1 */
354                 udelay(100);
355                 if ((inb_p(0x176) & 0x1f) != 0x1a) {
356                         spin_unlock_irqrestore(&cmd640_lock, flags);
357                         return 0; /* nothing responded */
358                 }
359         }
360         spin_unlock_irqrestore(&cmd640_lock, flags);
361         return 1; /* success */
362 }
363
364 #ifdef CMD640_DUMP_REGS
365 /*
366  * Dump out all cmd640 registers.  May be called from ide.c
367  */
368 static void cmd640_dump_regs(void)
369 {
370         unsigned int reg = cmd640_vlb ? 0x50 : 0x00;
371
372         /* Dump current state of chip registers */
373         printk("ide: cmd640 internal register dump:");
374         for (; reg <= 0x59; reg++) {
375                 if (!(reg & 0x0f))
376                         printk("\n%04x:", reg);
377                 printk(" %02x", get_cmd640_reg(reg));
378         }
379         printk("\n");
380 }
381 #endif
382
383 #ifndef CONFIG_BLK_DEV_CMD640_ENHANCED
384 /*
385  * Check whether prefetch is on for a drive,
386  * and initialize the unmask flags for safe operation.
387  */
388 static void __init check_prefetch(ide_drive_t *drive, unsigned int index)
389 {
390         u8 b = get_cmd640_reg(prefetch_regs[index]);
391
392         if (b & prefetch_masks[index]) {        /* is prefetch off? */
393                 drive->no_unmask = 0;
394                 drive->no_io_32bit = 1;
395                 drive->io_32bit = 0;
396         } else {
397 #if CMD640_PREFETCH_MASKS
398                 drive->no_unmask = 1;
399                 drive->unmask = 0;
400 #endif
401                 drive->no_io_32bit = 0;
402         }
403 }
404 #else
405 /*
406  * Sets prefetch mode for a drive.
407  */
408 static void set_prefetch_mode(ide_drive_t *drive, unsigned int index, int mode)
409 {
410         unsigned long flags;
411         int reg = prefetch_regs[index];
412         u8 b;
413
414         spin_lock_irqsave(&cmd640_lock, flags);
415         b = __get_cmd640_reg(reg);
416         if (mode) {     /* want prefetch on? */
417 #if CMD640_PREFETCH_MASKS
418                 drive->no_unmask = 1;
419                 drive->unmask = 0;
420 #endif
421                 drive->no_io_32bit = 0;
422                 b &= ~prefetch_masks[index];    /* enable prefetch */
423         } else {
424                 drive->no_unmask = 0;
425                 drive->no_io_32bit = 1;
426                 drive->io_32bit = 0;
427                 b |= prefetch_masks[index];     /* disable prefetch */
428         }
429         __put_cmd640_reg(reg, b);
430         spin_unlock_irqrestore(&cmd640_lock, flags);
431 }
432
433 /*
434  * Dump out current drive clocks settings
435  */
436 static void display_clocks(unsigned int index)
437 {
438         u8 active_count, recovery_count;
439
440         active_count = active_counts[index];
441         if (active_count == 1)
442                 ++active_count;
443         recovery_count = recovery_counts[index];
444         if (active_count > 3 && recovery_count == 1)
445                 ++recovery_count;
446         if (cmd640_chip_version > 1)
447                 recovery_count += 1;  /* cmd640b uses (count + 1)*/
448         printk(", clocks=%d/%d/%d\n", setup_counts[index], active_count, recovery_count);
449 }
450
451 /*
452  * Pack active and recovery counts into single byte representation
453  * used by controller
454  */
455 static inline u8 pack_nibbles(u8 upper, u8 lower)
456 {
457         return ((upper & 0x0f) << 4) | (lower & 0x0f);
458 }
459
460 /*
461  * This routine writes the prepared setup/active/recovery counts
462  * for a drive into the cmd640 chipset registers to active them.
463  */
464 static void program_drive_counts(ide_drive_t *drive, unsigned int index)
465 {
466         unsigned long flags;
467         u8 setup_count    = setup_counts[index];
468         u8 active_count   = active_counts[index];
469         u8 recovery_count = recovery_counts[index];
470
471         /*
472          * Set up address setup count and drive read/write timing registers.
473          * Primary interface has individual count/timing registers for
474          * each drive.  Secondary interface has one common set of registers,
475          * so we merge the timings, using the slowest value for each timing.
476          */
477         if (index > 1) {
478                 ide_hwif_t *hwif = drive->hwif;
479                 ide_drive_t *peer = &hwif->drives[!drive->select.b.unit];
480                 unsigned int mate = index ^ 1;
481
482                 if (peer->present) {
483                         if (setup_count < setup_counts[mate])
484                                 setup_count = setup_counts[mate];
485                         if (active_count < active_counts[mate])
486                                 active_count = active_counts[mate];
487                         if (recovery_count < recovery_counts[mate])
488                                 recovery_count = recovery_counts[mate];
489                 }
490         }
491
492         /*
493          * Convert setup_count to internal chipset representation
494          */
495         switch (setup_count) {
496         case 4:  setup_count = 0x00; break;
497         case 3:  setup_count = 0x80; break;
498         case 1:
499         case 2:  setup_count = 0x40; break;
500         default: setup_count = 0xc0; /* case 5 */
501         }
502
503         /*
504          * Now that everything is ready, program the new timings
505          */
506         spin_lock_irqsave(&cmd640_lock, flags);
507         /*
508          * Program the address_setup clocks into ARTTIM reg,
509          * and then the active/recovery counts into the DRWTIM reg
510          * (this converts counts of 16 into counts of zero -- okay).
511          */
512         setup_count |= __get_cmd640_reg(arttim_regs[index]) & 0x3f;
513         __put_cmd640_reg(arttim_regs[index], setup_count);
514         __put_cmd640_reg(drwtim_regs[index], pack_nibbles(active_count, recovery_count));
515         spin_unlock_irqrestore(&cmd640_lock, flags);
516 }
517
518 /*
519  * Set a specific pio_mode for a drive
520  */
521 static void cmd640_set_mode(ide_drive_t *drive, unsigned int index,
522                             u8 pio_mode, unsigned int cycle_time)
523 {
524         int setup_time, active_time, recovery_time, clock_time;
525         u8 setup_count, active_count, recovery_count, recovery_count2, cycle_count;
526         int bus_speed;
527
528         if (cmd640_vlb && ide_vlb_clk)
529                 bus_speed = ide_vlb_clk;
530         else if (!cmd640_vlb && ide_pci_clk)
531                 bus_speed = ide_pci_clk;
532         else
533                 bus_speed = system_bus_clock();
534
535         if (pio_mode > 5)
536                 pio_mode = 5;
537         setup_time  = ide_pio_timings[pio_mode].setup_time;
538         active_time = ide_pio_timings[pio_mode].active_time;
539         recovery_time = cycle_time - (setup_time + active_time);
540         clock_time = 1000 / bus_speed;
541         cycle_count = DIV_ROUND_UP(cycle_time, clock_time);
542
543         setup_count = DIV_ROUND_UP(setup_time, clock_time);
544
545         active_count = DIV_ROUND_UP(active_time, clock_time);
546         if (active_count < 2)
547                 active_count = 2; /* minimum allowed by cmd640 */
548
549         recovery_count = DIV_ROUND_UP(recovery_time, clock_time);
550         recovery_count2 = cycle_count - (setup_count + active_count);
551         if (recovery_count2 > recovery_count)
552                 recovery_count = recovery_count2;
553         if (recovery_count < 2)
554                 recovery_count = 2; /* minimum allowed by cmd640 */
555         if (recovery_count > 17) {
556                 active_count += recovery_count - 17;
557                 recovery_count = 17;
558         }
559         if (active_count > 16)
560                 active_count = 16; /* maximum allowed by cmd640 */
561         if (cmd640_chip_version > 1)
562                 recovery_count -= 1;  /* cmd640b uses (count + 1)*/
563         if (recovery_count > 16)
564                 recovery_count = 16; /* maximum allowed by cmd640 */
565
566         setup_counts[index]    = setup_count;
567         active_counts[index]   = active_count;
568         recovery_counts[index] = recovery_count;
569
570         /*
571          * In a perfect world, we might set the drive pio mode here
572          * (using WIN_SETFEATURE) before continuing.
573          *
574          * But we do not, because:
575          *      1) this is the wrong place to do it (proper is do_special() in ide.c)
576          *      2) in practice this is rarely, if ever, necessary
577          */
578         program_drive_counts(drive, index);
579 }
580
581 static void cmd640_set_pio_mode(ide_drive_t *drive, const u8 pio)
582 {
583         unsigned int index = 0, cycle_time;
584         u8 b;
585
586         switch (pio) {
587         case 6: /* set fast-devsel off */
588         case 7: /* set fast-devsel on */
589                 b = get_cmd640_reg(CNTRL) & ~0x27;
590                 if (pio & 1)
591                         b |= 0x27;
592                 put_cmd640_reg(CNTRL, b);
593                 printk("%s: %sabled cmd640 fast host timing (devsel)\n",
594                         drive->name, (pio & 1) ? "en" : "dis");
595                 return;
596         case 8: /* set prefetch off */
597         case 9: /* set prefetch on */
598                 set_prefetch_mode(drive, index, pio & 1);
599                 printk("%s: %sabled cmd640 prefetch\n",
600                         drive->name, (pio & 1) ? "en" : "dis");
601                 return;
602         }
603
604         cycle_time = ide_pio_cycle_time(drive, pio);
605         cmd640_set_mode(drive, index, pio, cycle_time);
606
607         printk("%s: selected cmd640 PIO mode%d (%dns)",
608                 drive->name, pio, cycle_time);
609
610         display_clocks(index);
611 }
612
613 static const struct ide_port_ops cmd640_port_ops = {
614         .set_pio_mode           = cmd640_set_pio_mode,
615 };
616 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
617
618 static int pci_conf1(void)
619 {
620         unsigned long flags;
621         u32 tmp;
622
623         spin_lock_irqsave(&cmd640_lock, flags);
624         outb(0x01, 0xCFB);
625         tmp = inl(0xCF8);
626         outl(0x80000000, 0xCF8);
627         if (inl(0xCF8) == 0x80000000) {
628                 outl(tmp, 0xCF8);
629                 spin_unlock_irqrestore(&cmd640_lock, flags);
630                 return 1;
631         }
632         outl(tmp, 0xCF8);
633         spin_unlock_irqrestore(&cmd640_lock, flags);
634         return 0;
635 }
636
637 static int pci_conf2(void)
638 {
639         unsigned long flags;
640
641         spin_lock_irqsave(&cmd640_lock, flags);
642         outb(0x00, 0xCFB);
643         outb(0x00, 0xCF8);
644         outb(0x00, 0xCFA);
645         if (inb(0xCF8) == 0x00 && inb(0xCF8) == 0x00) {
646                 spin_unlock_irqrestore(&cmd640_lock, flags);
647                 return 1;
648         }
649         spin_unlock_irqrestore(&cmd640_lock, flags);
650         return 0;
651 }
652
653 static const struct ide_port_info cmd640_port_info __initdata = {
654         .chipset                = ide_cmd640,
655         .host_flags             = IDE_HFLAG_SERIALIZE |
656                                   IDE_HFLAG_NO_DMA |
657                                   IDE_HFLAG_ABUSE_PREFETCH |
658                                   IDE_HFLAG_ABUSE_FAST_DEVSEL,
659 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
660         .port_ops               = &cmd640_port_ops,
661         .pio_mask               = ATA_PIO5,
662 #endif
663 };
664
665 static int cmd640x_init_one(unsigned long base, unsigned long ctl)
666 {
667         if (!request_region(base, 8, DRV_NAME)) {
668                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
669                                 DRV_NAME, base, base + 7);
670                 return -EBUSY;
671         }
672
673         if (!request_region(ctl, 1, DRV_NAME)) {
674                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
675                                 DRV_NAME, ctl);
676                 release_region(base, 8);
677                 return -EBUSY;
678         }
679
680         return 0;
681 }
682
683 /*
684  * Probe for a cmd640 chipset, and initialize it if found.
685  */
686 static int __init cmd640x_init(void)
687 {
688 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
689         int second_port_toggled = 0;
690 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
691         int second_port_cmd640 = 0, rc;
692         const char *bus_type, *port2;
693         unsigned int index;
694         u8 b, cfr;
695         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
696         hw_regs_t hw[2];
697
698         if (cmd640_vlb && probe_for_cmd640_vlb()) {
699                 bus_type = "VLB";
700         } else {
701                 cmd640_vlb = 0;
702                 /* Find out what kind of PCI probing is supported otherwise
703                    Justin Gibbs will sulk.. */
704                 if (pci_conf1() && probe_for_cmd640_pci1())
705                         bus_type = "PCI (type1)";
706                 else if (pci_conf2() && probe_for_cmd640_pci2())
707                         bus_type = "PCI (type2)";
708                 else
709                         return 0;
710         }
711         /*
712          * Undocumented magic (there is no 0x5b reg in specs)
713          */
714         put_cmd640_reg(0x5b, 0xbd);
715         if (get_cmd640_reg(0x5b) != 0xbd) {
716                 printk(KERN_ERR "ide: cmd640 init failed: wrong value in reg 0x5b\n");
717                 return 0;
718         }
719         put_cmd640_reg(0x5b, 0);
720
721 #ifdef CMD640_DUMP_REGS
722         cmd640_dump_regs();
723 #endif
724
725         /*
726          * Documented magic begins here
727          */
728         cfr = get_cmd640_reg(CFR);
729         cmd640_chip_version = cfr & CFR_DEVREV;
730         if (cmd640_chip_version == 0) {
731                 printk("ide: bad cmd640 revision: %d\n", cmd640_chip_version);
732                 return 0;
733         }
734
735         rc = cmd640x_init_one(0x1f0, 0x3f6);
736         if (rc)
737                 return rc;
738
739         rc = cmd640x_init_one(0x170, 0x376);
740         if (rc) {
741                 release_region(0x3f6, 1);
742                 release_region(0x1f0, 8);
743                 return rc;
744         }
745
746         memset(&hw, 0, sizeof(hw));
747
748         ide_std_init_ports(&hw[0], 0x1f0, 0x3f6);
749         hw[0].irq = 14;
750         hw[0].chipset = ide_cmd640;
751
752         ide_std_init_ports(&hw[1], 0x170, 0x376);
753         hw[1].irq = 15;
754         hw[1].chipset = ide_cmd640;
755
756         printk(KERN_INFO "cmd640: buggy cmd640%c interface on %s, config=0x%02x"
757                          "\n", 'a' + cmd640_chip_version - 1, bus_type, cfr);
758
759         cmd_hwif0 = ide_find_port();
760
761         /*
762          * Initialize data for primary port
763          */
764         if (cmd_hwif0) {
765                 ide_init_port_hw(cmd_hwif0, &hw[0]);
766                 idx[0] = cmd_hwif0->index;
767         }
768
769         /*
770          * Ensure compatibility by always using the slowest timings
771          * for access to the drive's command register block,
772          * and reset the prefetch burstsize to default (512 bytes).
773          *
774          * Maybe we need a way to NOT do these on *some* systems?
775          */
776         put_cmd640_reg(CMDTIM, 0);
777         put_cmd640_reg(BRST, 0x40);
778
779         cmd_hwif1 = ide_find_port();
780
781         /*
782          * Try to enable the secondary interface, if not already enabled
783          */
784         if (cmd_hwif1 &&
785             cmd_hwif1->drives[0].noprobe && cmd_hwif1->drives[1].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 && cmd_hwif1) {
817                 ide_init_port_hw(cmd_hwif1, &hw[1]);
818                 idx[1] = cmd_hwif1->index;
819         }
820         printk(KERN_INFO "cmd640: %sserialized, secondary interface %s\n",
821                          second_port_cmd640 ? "" : "not ", port2);
822
823         /*
824          * Establish initial timings/prefetch for all drives.
825          * Do not unnecessarily disturb any prior BIOS setup of these.
826          */
827         for (index = 0; index < (2 + (second_port_cmd640 << 1)); index++) {
828                 ide_drive_t *drive;
829
830                 if (index > 1) {
831                         if (cmd_hwif1 == NULL)
832                                 continue;
833                         drive = &cmd_hwif1->drives[index & 1];
834                 } else  {
835                         if (cmd_hwif0 == NULL)
836                                 continue;
837                         drive = &cmd_hwif0->drives[index & 1];
838                 }
839
840 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
841                 /*
842                  * Reset timing to the slowest speed and turn off prefetch.
843                  * This way, the drive identify code has a better chance.
844                  */
845                 setup_counts    [index] = 4;    /* max possible */
846                 active_counts   [index] = 16;   /* max possible */
847                 recovery_counts [index] = 16;   /* max possible */
848                 program_drive_counts(drive, index);
849                 set_prefetch_mode(drive, index, 0);
850                 printk("cmd640: drive%d timings/prefetch cleared\n", index);
851 #else
852                 /*
853                  * Set the drive unmask flags to match the prefetch setting
854                  */
855                 check_prefetch(drive, index);
856                 printk("cmd640: drive%d timings/prefetch(%s) preserved\n",
857                         index, drive->no_io_32bit ? "off" : "on");
858 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
859         }
860
861 #ifdef CMD640_DUMP_REGS
862         cmd640_dump_regs();
863 #endif
864
865         ide_device_add(idx, &cmd640_port_info);
866
867         return 1;
868 }
869
870 module_param_named(probe_vlb, cmd640_vlb, bool, 0);
871 MODULE_PARM_DESC(probe_vlb, "probe for VLB version of CMD640 chipset");
872
873 module_init(cmd640x_init);
874
875 MODULE_LICENSE("GPL");