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