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 "hda=autotune hdb=autotune"
  20  * To enable 2nd channel tuning (qd6580 only), use "hdc=autotune hdd=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 #include <linux/module.h>
  29 #include <linux/types.h>
  30 #include <linux/kernel.h>
  31 #include <linux/delay.h>
  32 #include <linux/timer.h>
  33 #include <linux/mm.h>
  34 #include <linux/ioport.h>
  35 #include <linux/blkdev.h>
  36 #include <linux/hdreg.h>
  37 #include <linux/ide.h>
  38 #include <linux/init.h>
  39 #include <asm/system.h>
  40 #include <asm/io.h>
  41
  42 #include "qd65xx.h"
  43
  44 /*
  45  * I/O ports are 0x30-0x31 (and 0x32-0x33 for qd6580)
  46  *            or 0xb0-0xb1 (and 0xb2-0xb3 for qd6580)
  47  *      -- qd6500 is a single IDE interface
  48  *      -- qd6580 is a dual IDE interface
  49  *
  50  * More research on qd6580 being done by willmore@cig.mot.com (David)
  51  * More Information given by Petr Soucek (petr@ryston.cz)
  52  * http://www.ryston.cz/petr/vlb
  53  */
  54
  55 /*
  56  * base: Timer1
  57  *
  58  *
  59  * base+0x01: Config (R/O)
  60  *
  61  * bit 0: ide baseport: 1 = 0x1f0 ; 0 = 0x170 (only useful for qd6500)
  62  * bit 1: qd65xx baseport: 1 = 0xb0 ; 0 = 0x30
  63  * bit 2: ID3: bus speed: 1 = <=33MHz ; 0 = >33MHz
  64  * bit 3: qd6500: 1 = disabled, 0 = enabled
  65  *        qd6580: 1
  66  * upper nibble:
  67  *        qd6500: 1100
  68  *        qd6580: either 1010 or 0101
  69  *
  70  *
  71  * base+0x02: Timer2 (qd6580 only)
  72  *
  73  *
  74  * base+0x03: Control (qd6580 only)
  75  *
  76  * bits 0-3 must always be set 1
  77  * bit 4 must be set 1, but is set 0 by dos driver while measuring vlb clock
  78  * bit 0 : 1 = Only primary port enabled : channel 0 for hda, channel 1 for hdb
  79  *         0 = Primary and Secondary ports enabled : channel 0 for hda & hdb
  80  *                                                   channel 1 for hdc & hdd
  81  * bit 1 : 1 = only disks on primary port
  82  *         0 = disks & ATAPI devices on primary port
  83  * bit 2-4 : always 0
  84  * bit 5 : status, but of what ?
  85  * bit 6 : always set 1 by dos driver
  86  * bit 7 : set 1 for non-ATAPI devices on primary port
  87  *      (maybe read-ahead and post-write buffer ?)
  88  */
  89
  90 static int timings[4]={-1,-1,-1,-1}; /* stores current timing for each timer */
  91
  92 /*
  93  * qd_select:
  94  *
  95  * This routine is invoked from ide.c to prepare for access to a given drive.
  96  */
  97
  98 static void qd_select (ide_drive_t *drive)
  99 {
 100         u8 index = ((   (QD_TIMREG(drive)) & 0x80 ) >> 7) |
 101                         (QD_TIMREG(drive) & 0x02);
 102
 103         if (timings[index] != QD_TIMING(drive))
 104                 outb(timings[index] = QD_TIMING(drive), QD_TIMREG(drive));
 105 }
 106
 107 /*
 108  * qd6500_compute_timing
 109  *
 110  * computes the timing value where
 111  *      lower nibble represents active time,   in count of VLB clocks
 112  *      upper nibble represents recovery time, in count of VLB clocks
 113  */
 114
 115 static u8 qd6500_compute_timing (ide_hwif_t *hwif, int active_time, int recovery_time)
 116 {
 117         u8 active_cycle,recovery_cycle;
 118
 119         if (system_bus_clock()<=33) {
 120                 active_cycle =   9  - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 2, 9);
 121                 recovery_cycle = 15 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 0, 15);
 122         } else {
 123                 active_cycle =   8  - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 1, 8);
 124                 recovery_cycle = 18 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 3, 18);
 125         }
 126
 127         return((recovery_cycle<<4) | 0x08 | active_cycle);
 128 }
 129
 130 /*
 131  * qd6580_compute_timing
 132  *
 133  * idem for qd6580
 134  */
 135
 136 static u8 qd6580_compute_timing (int active_time, int recovery_time)
 137 {
 138         u8 active_cycle   = 17 - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 2, 17);
 139         u8 recovery_cycle = 15 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 2, 15);
 140
 141         return((recovery_cycle<<4) | active_cycle);
 142 }
 143
 144 /*
 145  * qd_find_disk_type
 146  *
 147  * tries to find timing from dos driver's table
 148  */
 149
 150 static int qd_find_disk_type (ide_drive_t *drive,
 151                 int *active_time, int *recovery_time)
 152 {
 153         struct qd65xx_timing_s *p;
 154         char model[40];
 155
 156         if (!*drive->id->model) return 0;
 157
 158         strncpy(model,drive->id->model,40);
 159         ide_fixstring(model,40,1); /* byte-swap */
 160
 161         for (p = qd65xx_timing ; p->offset != -1 ; p++) {
 162                 if (!strncmp(p->model, model+p->offset, 4)) {
 163                         printk(KERN_DEBUG "%s: listed !\n", drive->name);
 164                         *active_time = p->active;
 165                         *recovery_time = p->recovery;
 166                         return 1;
 167                 }
 168         }
 169         return 0;
 170 }
 171
 172 /*
 173  * qd_timing_ok:
 174  *
 175  * check whether timings don't conflict
 176  */
 177
 178 static int qd_timing_ok (ide_drive_t drives[])
 179 {
 180         return (IDE_IMPLY(drives[0].present && drives[1].present,
 181                         IDE_IMPLY(QD_TIMREG(drives) == QD_TIMREG(drives+1),
 182                                   QD_TIMING(drives) == QD_TIMING(drives+1))));
 183         /* if same timing register, must be same timing */
 184 }
 185
 186 /*
 187  * qd_set_timing:
 188  *
 189  * records the timing, and enables selectproc as needed
 190  */
 191
 192 static void qd_set_timing (ide_drive_t *drive, u8 timing)
 193 {
 194         ide_hwif_t *hwif = HWIF(drive);
 195
 196         drive->drive_data &= 0xff00;
 197         drive->drive_data |= timing;
 198         if (qd_timing_ok(hwif->drives)) {
 199                 qd_select(drive); /* selects once */
 200                 hwif->selectproc = NULL;
 201         } else
 202                 hwif->selectproc = &qd_select;
 203
 204         printk(KERN_DEBUG "%s: %#x\n", drive->name, timing);
 205 }
 206
 207 static void qd6500_set_pio_mode(ide_drive_t *drive, const u8 pio)
 208 {
 209         int active_time   = 175;
 210         int recovery_time = 415; /* worst case values from the dos driver */
 211
 212         /*
 213          * FIXME: use "pio" value
 214          */
 215         if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)
 216                 && drive->id->tPIO && (drive->id->field_valid & 0x02)
 217                 && drive->id->eide_pio >= 240) {
 218
 219                 printk(KERN_INFO "%s: PIO mode%d\n", drive->name,
 220                                 drive->id->tPIO);
 221                 active_time = 110;
 222                 recovery_time = drive->id->eide_pio - 120;
 223         }
 224
 225         qd_set_timing(drive, qd6500_compute_timing(HWIF(drive), active_time, recovery_time));
 226 }
 227
 228 static void qd6580_set_pio_mode(ide_drive_t *drive, const u8 pio)
 229 {
 230         int base = HWIF(drive)->select_data;
 231         unsigned int cycle_time;
 232         int active_time   = 175;
 233         int recovery_time = 415; /* worst case values from the dos driver */
 234
 235         if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)) {
 236                 cycle_time = ide_pio_cycle_time(drive, pio);
 237
 238                 switch (pio) {
 239                         case 0: break;
 240                         case 3:
 241                                 if (cycle_time >= 110) {
 242                                         active_time = 86;
 243                                         recovery_time = cycle_time - 102;
 244                                 } else
 245                                         printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
 246                                 break;
 247                         case 4:
 248                                 if (cycle_time >= 69) {
 249                                         active_time = 70;
 250                                         recovery_time = cycle_time - 61;
 251                                 } else
 252                                         printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
 253                                 break;
 254                         default:
 255                                 if (cycle_time >= 180) {
 256                                         active_time = 110;
 257                                         recovery_time = cycle_time - 120;
 258                                 } else {
 259                                         active_time = ide_pio_timings[pio].active_time;
 260                                         recovery_time = cycle_time - active_time;
 261                                 }
 262                 }
 263                 printk(KERN_INFO "%s: PIO mode%d\n", drive->name,pio);
 264         }
 265
 266         if (!HWIF(drive)->channel && drive->media != ide_disk) {
 267                 outb(0x5f, QD_CONTROL_PORT);
 268                 printk(KERN_WARNING "%s: ATAPI: disabled read-ahead FIFO "
 269                         "and post-write buffer on %s.\n",
 270                         drive->name, HWIF(drive)->name);
 271         }
 272
 273         qd_set_timing(drive, qd6580_compute_timing(active_time, recovery_time));
 274 }
 275
 276 /*
 277  * qd_testreg
 278  *
 279  * tests if the given port is a register
 280  */
 281
 282 static int __init qd_testreg(int port)
 283 {
 284         unsigned long flags;
 285         u8 savereg, readreg;
 286
 287         local_irq_save(flags);
 288         savereg = inb_p(port);
 289         outb_p(QD_TESTVAL, port);       /* safe value */
 290         readreg = inb_p(port);
 291         outb(savereg, port);
 292         local_irq_restore(flags);
 293
 294         if (savereg == QD_TESTVAL) {
 295                 printk(KERN_ERR "Outch ! the probe for qd65xx isn't reliable !\n");
 296                 printk(KERN_ERR "Please contact maintainers to tell about your hardware\n");
 297                 printk(KERN_ERR "Assuming qd65xx is not present.\n");
 298                 return 1;
 299         }
 300
 301         return (readreg != QD_TESTVAL);
 302 }
 303
 304 /*
 305  * qd_setup:
 306  *
 307  * called to setup an ata channel : adjusts attributes & links for tuning
 308  */
 309
 310 static void __init qd_setup(ide_hwif_t *hwif, int base, int config,
 311                             unsigned int data0, unsigned int data1)
 312 {
 313         hwif->chipset = ide_qd65xx;
 314         hwif->channel = hwif->index;
 315         hwif->select_data = base;
 316         hwif->config_data = config;
 317         hwif->drives[0].drive_data = data0;
 318         hwif->drives[1].drive_data = data1;
 319         hwif->drives[0].io_32bit =
 320         hwif->drives[1].io_32bit = 1;
 321         hwif->pio_mask = ATA_PIO4;
 322 }
 323
 324 /*
 325  * qd_unsetup:
 326  *
 327  * called to unsetup an ata channel : back to default values, unlinks tuning
 328  */
 329 /*
 330 static void __exit qd_unsetup(ide_hwif_t *hwif)
 331 {
 332         u8 config = hwif->config_data;
 333         int base = hwif->select_data;
 334         void *set_pio_mode = (void *)hwif->set_pio_mode;
 335
 336         if (hwif->chipset != ide_qd65xx)
 337                 return;
 338
 339         printk(KERN_NOTICE "%s: back to defaults\n", hwif->name);
 340
 341         hwif->selectproc = NULL;
 342         hwif->set_pio_mode = NULL;
 343
 344         if (set_pio_mode == (void *)qd6500_set_pio_mode) {
 345                 // will do it for both
 346                 outb(QD6500_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
 347         } else if (set_pio_mode == (void *)qd6580_set_pio_mode) {
 348                 if (QD_CONTROL(hwif) & QD_CONTR_SEC_DISABLED) {
 349                         outb(QD6580_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
 350                         outb(QD6580_DEF_DATA2, QD_TIMREG(&hwif->drives[1]));
 351                 } else {
 352                         outb(hwif->channel ? QD6580_DEF_DATA2 : QD6580_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
 353                 }
 354         } else {
 355                 printk(KERN_WARNING "Unknown qd65xx tuning fonction !\n");
 356                 printk(KERN_WARNING "keeping settings !\n");
 357         }
 358 }
 359 */
 360
 361 /*
 362  * qd_probe:
 363  *
 364  * looks at the specified baseport, and if qd found, registers & initialises it
 365  * return 1 if another qd may be probed
 366  */
 367
 368 static int __init qd_probe(int base)
 369 {
 370         ide_hwif_t *hwif;
 371         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 372         u8 config;
 373         u8 unit;
 374
 375         config = inb(QD_CONFIG_PORT);
 376
 377         if (! ((config & QD_CONFIG_BASEPORT) >> 1 == (base == 0xb0)) )
 378                 return 1;
 379
 380         unit = ! (config & QD_CONFIG_IDE_BASEPORT);
 381
 382         if ((config & 0xf0) == QD_CONFIG_QD6500) {
 383
 384                 if (qd_testreg(base)) return 1;         /* bad register */
 385
 386                 /* qd6500 found */
 387
 388                 hwif = &ide_hwifs[unit];
 389                 printk(KERN_NOTICE "%s: qd6500 at %#x\n", hwif->name, base);
 390                 printk(KERN_DEBUG "qd6500: config=%#x, ID3=%u\n",
 391                         config, QD_ID3);
 392
 393                 if (config & QD_CONFIG_DISABLED) {
 394                         printk(KERN_WARNING "qd6500 is disabled !\n");
 395                         return 1;
 396                 }
 397
 398                 qd_setup(hwif, base, config, QD6500_DEF_DATA, QD6500_DEF_DATA);
 399
 400                 hwif->set_pio_mode = &qd6500_set_pio_mode;
 401
 402                 idx[0] = unit;
 403
 404                 ide_device_add(idx);
 405
 406                 return 1;
 407         }
 408
 409         if (((config & 0xf0) == QD_CONFIG_QD6580_A) ||
 410             ((config & 0xf0) == QD_CONFIG_QD6580_B)) {
 411
 412                 u8 control;
 413
 414                 if (qd_testreg(base) || qd_testreg(base+0x02)) return 1;
 415                         /* bad registers */
 416
 417                 /* qd6580 found */
 418
 419                 control = inb(QD_CONTROL_PORT);
 420
 421                 printk(KERN_NOTICE "qd6580 at %#x\n", base);
 422                 printk(KERN_DEBUG "qd6580: config=%#x, control=%#x, ID3=%u\n",
 423                         config, control, QD_ID3);
 424
 425                 if (control & QD_CONTR_SEC_DISABLED) {
 426                         /* secondary disabled */
 427
 428                         hwif = &ide_hwifs[unit];
 429                         printk(KERN_INFO "%s: qd6580: single IDE board\n",
 430                                          hwif->name);
 431                         qd_setup(hwif, base, config | (control << 8),
 432                                  QD6580_DEF_DATA, QD6580_DEF_DATA2);
 433
 434                         hwif->set_pio_mode = &qd6580_set_pio_mode;
 435
 436                         idx[0] = unit;
 437
 438                         ide_device_add(idx);
 439
 440                         outb(QD_DEF_CONTR, QD_CONTROL_PORT);
 441
 442                         return 1;
 443                 } else {
 444                         ide_hwif_t *mate;
 445
 446                         hwif = &ide_hwifs[0];
 447                         mate = &ide_hwifs[1];
 448                         /* secondary enabled */
 449                         printk(KERN_INFO "%s&%s: qd6580: dual IDE board\n",
 450                                         hwif->name, mate->name);
 451
 452                         qd_setup(hwif, base, config | (control << 8),
 453                                  QD6580_DEF_DATA, QD6580_DEF_DATA);
 454
 455                         hwif->set_pio_mode = &qd6580_set_pio_mode;
 456
 457                         qd_setup(mate, base, config | (control << 8),
 458                                  QD6580_DEF_DATA2, QD6580_DEF_DATA2);
 459
 460                         mate->set_pio_mode = &qd6580_set_pio_mode;
 461
 462                         idx[0] = 0;
 463                         idx[1] = 1;
 464
 465                         ide_device_add(idx);
 466
 467                         outb(QD_DEF_CONTR, QD_CONTROL_PORT);
 468
 469                         return 0; /* no other qd65xx possible */
 470                 }
 471         }
 472         /* no qd65xx found */
 473         return 1;
 474 }
 475
 476 int probe_qd65xx = 0;
 477
 478 module_param_named(probe, probe_qd65xx, bool, 0);
 479 MODULE_PARM_DESC(probe, "probe for QD65xx chipsets");
 480
 481 /* Can be called directly from ide.c. */
 482 int __init qd65xx_init(void)
 483 {
 484         if (probe_qd65xx == 0)
 485                 return -ENODEV;
 486
 487         if (qd_probe(0x30))
 488                 qd_probe(0xb0);
 489         if (ide_hwifs[0].chipset != ide_qd65xx &&
 490             ide_hwifs[1].chipset != ide_qd65xx)
 491                 return -ENODEV;
 492         return 0;
 493 }
 494
 495 #ifdef MODULE
 496 module_init(qd65xx_init);
 497 #endif
 498
 499 MODULE_AUTHOR("Samuel Thibault");
 500 MODULE_DESCRIPTION("support of qd65xx vlb ide chipset");
 501 MODULE_LICENSE("GPL");