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");