Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
[linux-2.6] / drivers / ide / legacy / qd65xx.c
1 /*
2  *  linux/drivers/ide/legacy/qd65xx.c           Version 0.07    Sep 30, 2001
3  *
4  *  Copyright (C) 1996-2001  Linus Torvalds & author (see below)
5  */
6
7 /*
8  *  Version 0.03        Cleaned auto-tune, added probe
9  *  Version 0.04        Added second channel tuning
10  *  Version 0.05        Enhanced tuning ; added qd6500 support
11  *  Version 0.06        Added dos driver's list
12  *  Version 0.07        Second channel bug fix 
13  *
14  * QDI QD6500/QD6580 EIDE controller fast support
15  *
16  * Please set local bus speed using kernel parameter idebus
17  *      for example, "idebus=33" stands for 33Mhz VLbus
18  * To activate controller support, use "ide0=qd65xx"
19  * To enable tuning, use "ide0=autotune"
20  * To enable second channel tuning (qd6580 only), use "ide1=autotune"
21  */
22
23 /*
24  * Rewritten from the work of Colten Edwards <pje120@cs.usask.ca> by
25  * Samuel Thibault <samuel.thibault@fnac.net>
26  */
27
28 #undef REALLY_SLOW_IO           /* most systems can safely undef this */
29
30 #include <linux/module.h>
31 #include <linux/types.h>
32 #include <linux/kernel.h>
33 #include <linux/delay.h>
34 #include <linux/timer.h>
35 #include <linux/mm.h>
36 #include <linux/ioport.h>
37 #include <linux/blkdev.h>
38 #include <linux/hdreg.h>
39 #include <linux/ide.h>
40 #include <linux/init.h>
41 #include <asm/system.h>
42 #include <asm/io.h>
43
44 #include "qd65xx.h"
45
46 /*
47  * I/O ports are 0x30-0x31 (and 0x32-0x33 for qd6580)
48  *            or 0xb0-0xb1 (and 0xb2-0xb3 for qd6580)
49  *      -- qd6500 is a single IDE interface
50  *      -- qd6580 is a dual IDE interface
51  *
52  * More research on qd6580 being done by willmore@cig.mot.com (David)
53  * More Information given by Petr Soucek (petr@ryston.cz)
54  * http://www.ryston.cz/petr/vlb
55  */
56
57 /*
58  * base: Timer1
59  *
60  *
61  * base+0x01: Config (R/O)
62  *
63  * bit 0: ide baseport: 1 = 0x1f0 ; 0 = 0x170 (only useful for qd6500)
64  * bit 1: qd65xx baseport: 1 = 0xb0 ; 0 = 0x30
65  * bit 2: ID3: bus speed: 1 = <=33MHz ; 0 = >33MHz
66  * bit 3: qd6500: 1 = disabled, 0 = enabled
67  *        qd6580: 1
68  * upper nibble:
69  *        qd6500: 1100
70  *        qd6580: either 1010 or 0101
71  *
72  *
73  * base+0x02: Timer2 (qd6580 only)
74  *
75  *
76  * base+0x03: Control (qd6580 only)
77  *
78  * bits 0-3 must always be set 1
79  * bit 4 must be set 1, but is set 0 by dos driver while measuring vlb clock
80  * bit 0 : 1 = Only primary port enabled : channel 0 for hda, channel 1 for hdb
81  *         0 = Primary and Secondary ports enabled : channel 0 for hda & hdb
82  *                                                   channel 1 for hdc & hdd
83  * bit 1 : 1 = only disks on primary port
84  *         0 = disks & ATAPI devices on primary port
85  * bit 2-4 : always 0
86  * bit 5 : status, but of what ?
87  * bit 6 : always set 1 by dos driver
88  * bit 7 : set 1 for non-ATAPI devices on primary port
89  *      (maybe read-ahead and post-write buffer ?)
90  */
91
92 static int timings[4]={-1,-1,-1,-1}; /* stores current timing for each timer */
93
94 static void qd_write_reg (u8 content, unsigned long reg)
95 {
96         unsigned long flags;
97
98         spin_lock_irqsave(&ide_lock, flags);
99         outb(content,reg);
100         spin_unlock_irqrestore(&ide_lock, flags);
101 }
102
103 static u8 __init qd_read_reg (unsigned long reg)
104 {
105         unsigned long flags;
106         u8 read;
107
108         spin_lock_irqsave(&ide_lock, flags);
109         read = inb(reg);
110         spin_unlock_irqrestore(&ide_lock, flags);
111         return read;
112 }
113
114 /*
115  * qd_select:
116  *
117  * This routine is invoked from ide.c to prepare for access to a given drive.
118  */
119
120 static void qd_select (ide_drive_t *drive)
121 {
122         u8 index = ((   (QD_TIMREG(drive)) & 0x80 ) >> 7) |
123                         (QD_TIMREG(drive) & 0x02);
124
125         if (timings[index] != QD_TIMING(drive))
126                 qd_write_reg(timings[index] = QD_TIMING(drive), QD_TIMREG(drive));
127 }
128
129 /*
130  * qd6500_compute_timing
131  *
132  * computes the timing value where
133  *      lower nibble represents active time,   in count of VLB clocks
134  *      upper nibble represents recovery time, in count of VLB clocks
135  */
136
137 static u8 qd6500_compute_timing (ide_hwif_t *hwif, int active_time, int recovery_time)
138 {
139         u8 active_cycle,recovery_cycle;
140
141         if (system_bus_clock()<=33) {
142                 active_cycle =   9  - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 2, 9);
143                 recovery_cycle = 15 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 0, 15);
144         } else {
145                 active_cycle =   8  - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 1, 8);
146                 recovery_cycle = 18 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 3, 18);
147         }
148
149         return((recovery_cycle<<4) | 0x08 | active_cycle);
150 }
151
152 /*
153  * qd6580_compute_timing
154  *
155  * idem for qd6580
156  */
157
158 static u8 qd6580_compute_timing (int active_time, int recovery_time)
159 {
160         u8 active_cycle   = 17 - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 2, 17);
161         u8 recovery_cycle = 15 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 2, 15);
162
163         return((recovery_cycle<<4) | active_cycle);
164 }
165
166 /*
167  * qd_find_disk_type
168  *
169  * tries to find timing from dos driver's table
170  */
171
172 static int qd_find_disk_type (ide_drive_t *drive,
173                 int *active_time, int *recovery_time)
174 {
175         struct qd65xx_timing_s *p;
176         char model[40];
177
178         if (!*drive->id->model) return 0;
179
180         strncpy(model,drive->id->model,40);
181         ide_fixstring(model,40,1); /* byte-swap */
182
183         for (p = qd65xx_timing ; p->offset != -1 ; p++) {
184                 if (!strncmp(p->model, model+p->offset, 4)) {
185                         printk(KERN_DEBUG "%s: listed !\n", drive->name);
186                         *active_time = p->active;
187                         *recovery_time = p->recovery;
188                         return 1;
189                 }
190         }
191         return 0;
192 }
193
194 /*
195  * qd_timing_ok:
196  *
197  * check whether timings don't conflict
198  */
199
200 static int qd_timing_ok (ide_drive_t drives[])
201 {
202         return (IDE_IMPLY(drives[0].present && drives[1].present,
203                         IDE_IMPLY(QD_TIMREG(drives) == QD_TIMREG(drives+1),
204                                   QD_TIMING(drives) == QD_TIMING(drives+1))));
205         /* if same timing register, must be same timing */
206 }
207
208 /*
209  * qd_set_timing:
210  *
211  * records the timing, and enables selectproc as needed
212  */
213
214 static void qd_set_timing (ide_drive_t *drive, u8 timing)
215 {
216         ide_hwif_t *hwif = HWIF(drive);
217
218         drive->drive_data &= 0xff00;
219         drive->drive_data |= timing;
220         if (qd_timing_ok(hwif->drives)) {
221                 qd_select(drive); /* selects once */
222                 hwif->selectproc = NULL;
223         } else
224                 hwif->selectproc = &qd_select;
225
226         printk(KERN_DEBUG "%s: %#x\n", drive->name, timing);
227 }
228
229 /*
230  * qd6500_tune_drive
231  */
232
233 static void qd6500_tune_drive (ide_drive_t *drive, u8 pio)
234 {
235         int active_time   = 175;
236         int recovery_time = 415; /* worst case values from the dos driver */
237
238         if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)
239                 && drive->id->tPIO && (drive->id->field_valid & 0x02)
240                 && drive->id->eide_pio >= 240) {
241
242                 printk(KERN_INFO "%s: PIO mode%d\n", drive->name,
243                                 drive->id->tPIO);
244                 active_time = 110;
245                 recovery_time = drive->id->eide_pio - 120;
246         }
247
248         qd_set_timing(drive, qd6500_compute_timing(HWIF(drive), active_time, recovery_time));
249 }
250
251 /*
252  * qd6580_tune_drive
253  */
254
255 static void qd6580_tune_drive (ide_drive_t *drive, u8 pio)
256 {
257         ide_pio_data_t d;
258         int base = HWIF(drive)->select_data;
259         int active_time   = 175;
260         int recovery_time = 415; /* worst case values from the dos driver */
261
262         if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)) {
263                 pio = ide_get_best_pio_mode(drive, pio, 255, &d);
264                 pio = min_t(u8, pio, 4);
265
266                 switch (pio) {
267                         case 0: break;
268                         case 3:
269                                 if (d.cycle_time >= 110) {
270                                         active_time = 86;
271                                         recovery_time = d.cycle_time - 102;
272                                 } else
273                                         printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
274                                 break;
275                         case 4:
276                                 if (d.cycle_time >= 69) {
277                                         active_time = 70;
278                                         recovery_time = d.cycle_time - 61;
279                                 } else
280                                         printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
281                                 break;
282                         default:
283                                 if (d.cycle_time >= 180) {
284                                         active_time = 110;
285                                         recovery_time = d.cycle_time - 120;
286                                 } else {
287                                         active_time = ide_pio_timings[pio].active_time;
288                                         recovery_time = d.cycle_time
289                                                         -active_time;
290                                 }
291                 }
292                 printk(KERN_INFO "%s: PIO mode%d\n", drive->name,pio);
293         }
294
295         if (!HWIF(drive)->channel && drive->media != ide_disk) {
296                 qd_write_reg(0x5f, QD_CONTROL_PORT);
297                 printk(KERN_WARNING "%s: ATAPI: disabled read-ahead FIFO "
298                         "and post-write buffer on %s.\n",
299                         drive->name, HWIF(drive)->name);
300         }
301
302         qd_set_timing(drive, qd6580_compute_timing(active_time, recovery_time));
303 }
304
305 /*
306  * qd_testreg
307  *
308  * tests if the given port is a register
309  */
310
311 static int __init qd_testreg(int port)
312 {
313         u8 savereg;
314         u8 readreg;
315         unsigned long flags;
316
317         spin_lock_irqsave(&ide_lock, flags);
318         savereg = inb_p(port);
319         outb_p(QD_TESTVAL, port);       /* safe value */
320         readreg = inb_p(port);
321         outb(savereg, port);
322         spin_unlock_irqrestore(&ide_lock, flags);
323
324         if (savereg == QD_TESTVAL) {
325                 printk(KERN_ERR "Outch ! the probe for qd65xx isn't reliable !\n");
326                 printk(KERN_ERR "Please contact maintainers to tell about your hardware\n");
327                 printk(KERN_ERR "Assuming qd65xx is not present.\n");
328                 return 1;
329         }
330
331         return (readreg != QD_TESTVAL);
332 }
333
334 /*
335  * qd_setup:
336  *
337  * called to setup an ata channel : adjusts attributes & links for tuning
338  */
339
340 static void __init qd_setup(ide_hwif_t *hwif, int base, int config,
341                             unsigned int data0, unsigned int data1,
342                             void (*tuneproc) (ide_drive_t *, u8 pio))
343 {
344         hwif->chipset = ide_qd65xx;
345         hwif->channel = hwif->index;
346         hwif->select_data = base;
347         hwif->config_data = config;
348         hwif->drives[0].drive_data = data0;
349         hwif->drives[1].drive_data = data1;
350         hwif->drives[0].io_32bit =
351         hwif->drives[1].io_32bit = 1;
352         hwif->tuneproc = tuneproc;
353         probe_hwif_init(hwif);
354 }
355
356 /*
357  * qd_unsetup:
358  *
359  * called to unsetup an ata channel : back to default values, unlinks tuning
360  */
361 /*
362 static void __exit qd_unsetup(ide_hwif_t *hwif)
363 {
364         u8 config = hwif->config_data;
365         int base = hwif->select_data;
366         void *tuneproc = (void *) hwif->tuneproc;
367
368         if (hwif->chipset != ide_qd65xx)
369                 return;
370
371         printk(KERN_NOTICE "%s: back to defaults\n", hwif->name);
372
373         hwif->selectproc = NULL;
374         hwif->tuneproc = NULL;
375
376         if (tuneproc == (void *) qd6500_tune_drive) {
377                 // will do it for both
378                 qd_write_reg(QD6500_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
379         } else if (tuneproc == (void *) qd6580_tune_drive) {
380                 if (QD_CONTROL(hwif) & QD_CONTR_SEC_DISABLED) {
381                         qd_write_reg(QD6580_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
382                         qd_write_reg(QD6580_DEF_DATA2, QD_TIMREG(&hwif->drives[1]));
383                 } else {
384                         qd_write_reg(hwif->channel ? QD6580_DEF_DATA2 : QD6580_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
385                 }
386         } else {
387                 printk(KERN_WARNING "Unknown qd65xx tuning fonction !\n");
388                 printk(KERN_WARNING "keeping settings !\n");
389         }
390 }
391 */
392
393 /*
394  * qd_probe:
395  *
396  * looks at the specified baseport, and if qd found, registers & initialises it
397  * return 1 if another qd may be probed
398  */
399
400 static int __init qd_probe(int base)
401 {
402         ide_hwif_t *hwif;
403         u8 config;
404         u8 unit;
405
406         config = qd_read_reg(QD_CONFIG_PORT);
407
408         if (! ((config & QD_CONFIG_BASEPORT) >> 1 == (base == 0xb0)) )
409                 return 1;
410
411         unit = ! (config & QD_CONFIG_IDE_BASEPORT);
412
413         if ((config & 0xf0) == QD_CONFIG_QD6500) {
414
415                 if (qd_testreg(base)) return 1;         /* bad register */
416
417                 /* qd6500 found */
418
419                 hwif = &ide_hwifs[unit];
420                 printk(KERN_NOTICE "%s: qd6500 at %#x\n", hwif->name, base);
421                 printk(KERN_DEBUG "qd6500: config=%#x, ID3=%u\n",
422                         config, QD_ID3);
423                 
424                 if (config & QD_CONFIG_DISABLED) {
425                         printk(KERN_WARNING "qd6500 is disabled !\n");
426                         return 1;
427                 }
428
429                 qd_setup(hwif, base, config, QD6500_DEF_DATA, QD6500_DEF_DATA,
430                          &qd6500_tune_drive);
431
432                 create_proc_ide_interfaces();
433
434                 return 1;
435         }
436
437         if (((config & 0xf0) == QD_CONFIG_QD6580_A) ||
438             ((config & 0xf0) == QD_CONFIG_QD6580_B)) {
439
440                 u8 control;
441
442                 if (qd_testreg(base) || qd_testreg(base+0x02)) return 1;
443                         /* bad registers */
444
445                 /* qd6580 found */
446
447                 control = qd_read_reg(QD_CONTROL_PORT);
448
449                 printk(KERN_NOTICE "qd6580 at %#x\n", base);
450                 printk(KERN_DEBUG "qd6580: config=%#x, control=%#x, ID3=%u\n",
451                         config, control, QD_ID3);
452
453                 if (control & QD_CONTR_SEC_DISABLED) {
454                         /* secondary disabled */
455
456                         hwif = &ide_hwifs[unit];
457                         printk(KERN_INFO "%s: qd6580: single IDE board\n",
458                                          hwif->name);
459                         qd_setup(hwif, base, config | (control << 8),
460                                  QD6580_DEF_DATA, QD6580_DEF_DATA2,
461                                  &qd6580_tune_drive);
462                         qd_write_reg(QD_DEF_CONTR,QD_CONTROL_PORT);
463
464                         create_proc_ide_interfaces();
465
466                         return 1;
467                 } else {
468                         ide_hwif_t *mate;
469
470                         hwif = &ide_hwifs[0];
471                         mate = &ide_hwifs[1];
472                         /* secondary enabled */
473                         printk(KERN_INFO "%s&%s: qd6580: dual IDE board\n",
474                                         hwif->name, mate->name);
475
476                         qd_setup(hwif, base, config | (control << 8),
477                                  QD6580_DEF_DATA, QD6580_DEF_DATA,
478                                  &qd6580_tune_drive);
479                         qd_setup(mate, base, config | (control << 8),
480                                  QD6580_DEF_DATA2, QD6580_DEF_DATA2,
481                                  &qd6580_tune_drive);
482                         qd_write_reg(QD_DEF_CONTR,QD_CONTROL_PORT);
483
484                         create_proc_ide_interfaces();
485
486                         return 0; /* no other qd65xx possible */
487                 }
488         }
489         /* no qd65xx found */
490         return 1;
491 }
492
493 /* Can be called directly from ide.c. */
494 int __init qd65xx_init(void)
495 {
496         if (qd_probe(0x30))
497                 qd_probe(0xb0);
498         if (ide_hwifs[0].chipset != ide_qd65xx &&
499             ide_hwifs[1].chipset != ide_qd65xx)
500                 return -ENODEV;
501         return 0;
502 }
503
504 #ifdef MODULE
505 module_init(qd65xx_init);
506 #endif
507
508 MODULE_AUTHOR("Samuel Thibault");
509 MODULE_DESCRIPTION("support of qd65xx vlb ide chipset");
510 MODULE_LICENSE("GPL");