drivers/ide/legacy/qd65xx.c

   1 /*
   2  *  Copyright (C) 1996-2001  Linus Torvalds & author (see below)
   3  */
   4
   5 /*
   6  *  Version 0.03        Cleaned auto-tune, added probe
   7  *  Version 0.04        Added second channel tuning
   8  *  Version 0.05        Enhanced tuning ; added qd6500 support
   9  *  Version 0.06        Added dos driver's list
  10  *  Version 0.07        Second channel bug fix
  11  *
  12  * QDI QD6500/QD6580 EIDE controller fast support
  13  *
  14  * Please set local bus speed using kernel parameter idebus
  15  *      for example, "idebus=33" stands for 33Mhz VLbus
  16  * To activate controller support, use "ide0=qd65xx"
  17  * To enable tuning, use "hda=autotune hdb=autotune"
  18  * To enable 2nd channel tuning (qd6580 only), use "hdc=autotune hdd=autotune"
  19  */
  20
  21 /*
  22  * Rewritten from the work of Colten Edwards <pje120@cs.usask.ca> by
  23  * Samuel Thibault <samuel.thibault@fnac.net>
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/types.h>
  28 #include <linux/kernel.h>
  29 #include <linux/delay.h>
  30 #include <linux/timer.h>
  31 #include <linux/mm.h>
  32 #include <linux/ioport.h>
  33 #include <linux/blkdev.h>
  34 #include <linux/hdreg.h>
  35 #include <linux/ide.h>
  36 #include <linux/init.h>
  37 #include <asm/system.h>
  38 #include <asm/io.h>
  39
  40 #include "qd65xx.h"
  41
  42 /*
  43  * I/O ports are 0x30-0x31 (and 0x32-0x33 for qd6580)
  44  *            or 0xb0-0xb1 (and 0xb2-0xb3 for qd6580)
  45  *      -- qd6500 is a single IDE interface
  46  *      -- qd6580 is a dual IDE interface
  47  *
  48  * More research on qd6580 being done by willmore@cig.mot.com (David)
  49  * More Information given by Petr Soucek (petr@ryston.cz)
  50  * http://www.ryston.cz/petr/vlb
  51  */
  52
  53 /*
  54  * base: Timer1
  55  *
  56  *
  57  * base+0x01: Config (R/O)
  58  *
  59  * bit 0: ide baseport: 1 = 0x1f0 ; 0 = 0x170 (only useful for qd6500)
  60  * bit 1: qd65xx baseport: 1 = 0xb0 ; 0 = 0x30
  61  * bit 2: ID3: bus speed: 1 = <=33MHz ; 0 = >33MHz
  62  * bit 3: qd6500: 1 = disabled, 0 = enabled
  63  *        qd6580: 1
  64  * upper nibble:
  65  *        qd6500: 1100
  66  *        qd6580: either 1010 or 0101
  67  *
  68  *
  69  * base+0x02: Timer2 (qd6580 only)
  70  *
  71  *
  72  * base+0x03: Control (qd6580 only)
  73  *
  74  * bits 0-3 must always be set 1
  75  * bit 4 must be set 1, but is set 0 by dos driver while measuring vlb clock
  76  * bit 0 : 1 = Only primary port enabled : channel 0 for hda, channel 1 for hdb
  77  *         0 = Primary and Secondary ports enabled : channel 0 for hda & hdb
  78  *                                                   channel 1 for hdc & hdd
  79  * bit 1 : 1 = only disks on primary port
  80  *         0 = disks & ATAPI devices on primary port
  81  * bit 2-4 : always 0
  82  * bit 5 : status, but of what ?
  83  * bit 6 : always set 1 by dos driver
  84  * bit 7 : set 1 for non-ATAPI devices on primary port
  85  *      (maybe read-ahead and post-write buffer ?)
  86  */
  87
  88 static int timings[4]={-1,-1,-1,-1}; /* stores current timing for each timer */
  89
  90 /*
  91  * qd_select:
  92  *
  93  * This routine is invoked from ide.c to prepare for access to a given drive.
  94  */
  95
  96 static void qd_select (ide_drive_t *drive)
  97 {
  98         u8 index = ((   (QD_TIMREG(drive)) & 0x80 ) >> 7) |
  99                         (QD_TIMREG(drive) & 0x02);
 100
 101         if (timings[index] != QD_TIMING(drive))
 102                 outb(timings[index] = QD_TIMING(drive), QD_TIMREG(drive));
 103 }
 104
 105 /*
 106  * qd6500_compute_timing
 107  *
 108  * computes the timing value where
 109  *      lower nibble represents active time,   in count of VLB clocks
 110  *      upper nibble represents recovery time, in count of VLB clocks
 111  */
 112
 113 static u8 qd6500_compute_timing (ide_hwif_t *hwif, int active_time, int recovery_time)
 114 {
 115         u8 active_cycle,recovery_cycle;
 116
 117         if (system_bus_clock()<=33) {
 118                 active_cycle =   9  - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 2, 9);
 119                 recovery_cycle = 15 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 0, 15);
 120         } else {
 121                 active_cycle =   8  - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 1, 8);
 122                 recovery_cycle = 18 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 3, 18);
 123         }
 124
 125         return((recovery_cycle<<4) | 0x08 | active_cycle);
 126 }
 127
 128 /*
 129  * qd6580_compute_timing
 130  *
 131  * idem for qd6580
 132  */
 133
 134 static u8 qd6580_compute_timing (int active_time, int recovery_time)
 135 {
 136         u8 active_cycle   = 17 - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 2, 17);
 137         u8 recovery_cycle = 15 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 2, 15);
 138
 139         return((recovery_cycle<<4) | active_cycle);
 140 }
 141
 142 /*
 143  * qd_find_disk_type
 144  *
 145  * tries to find timing from dos driver's table
 146  */
 147
 148 static int qd_find_disk_type (ide_drive_t *drive,
 149                 int *active_time, int *recovery_time)
 150 {
 151         struct qd65xx_timing_s *p;
 152         char model[40];
 153
 154         if (!*drive->id->model) return 0;
 155
 156         strncpy(model,drive->id->model,40);
 157         ide_fixstring(model,40,1); /* byte-swap */
 158
 159         for (p = qd65xx_timing ; p->offset != -1 ; p++) {
 160                 if (!strncmp(p->model, model+p->offset, 4)) {
 161                         printk(KERN_DEBUG "%s: listed !\n", drive->name);
 162                         *active_time = p->active;
 163                         *recovery_time = p->recovery;
 164                         return 1;
 165                 }
 166         }
 167         return 0;
 168 }
 169
 170 /*
 171  * qd_timing_ok:
 172  *
 173  * check whether timings don't conflict
 174  */
 175
 176 static int qd_timing_ok (ide_drive_t drives[])
 177 {
 178         return (IDE_IMPLY(drives[0].present && drives[1].present,
 179                         IDE_IMPLY(QD_TIMREG(drives) == QD_TIMREG(drives+1),
 180                                   QD_TIMING(drives) == QD_TIMING(drives+1))));
 181         /* if same timing register, must be same timing */
 182 }
 183
 184 /*
 185  * qd_set_timing:
 186  *
 187  * records the timing, and enables selectproc as needed
 188  */
 189
 190 static void qd_set_timing (ide_drive_t *drive, u8 timing)
 191 {
 192         ide_hwif_t *hwif = HWIF(drive);
 193
 194         drive->drive_data &= 0xff00;
 195         drive->drive_data |= timing;
 196         if (qd_timing_ok(hwif->drives)) {
 197                 qd_select(drive); /* selects once */
 198                 hwif->selectproc = NULL;
 199         } else
 200                 hwif->selectproc = &qd_select;
 201
 202         printk(KERN_DEBUG "%s: %#x\n", drive->name, timing);
 203 }
 204
 205 static void qd6500_set_pio_mode(ide_drive_t *drive, const u8 pio)
 206 {
 207         int active_time   = 175;
 208         int recovery_time = 415; /* worst case values from the dos driver */
 209
 210         /*
 211          * FIXME: use "pio" value
 212          */
 213         if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)
 214                 && drive->id->tPIO && (drive->id->field_valid & 0x02)
 215                 && drive->id->eide_pio >= 240) {
 216
 217                 printk(KERN_INFO "%s: PIO mode%d\n", drive->name,
 218                                 drive->id->tPIO);
 219                 active_time = 110;
 220                 recovery_time = drive->id->eide_pio - 120;
 221         }
 222
 223         qd_set_timing(drive, qd6500_compute_timing(HWIF(drive), active_time, recovery_time));
 224 }
 225
 226 static void qd6580_set_pio_mode(ide_drive_t *drive, const u8 pio)
 227 {
 228         int base = HWIF(drive)->select_data;
 229         unsigned int cycle_time;
 230         int active_time   = 175;
 231         int recovery_time = 415; /* worst case values from the dos driver */
 232
 233         if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)) {
 234                 cycle_time = ide_pio_cycle_time(drive, pio);
 235
 236                 switch (pio) {
 237                         case 0: break;
 238                         case 3:
 239                                 if (cycle_time >= 110) {
 240                                         active_time = 86;
 241                                         recovery_time = cycle_time - 102;
 242                                 } else
 243                                         printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
 244                                 break;
 245                         case 4:
 246                                 if (cycle_time >= 69) {
 247                                         active_time = 70;
 248                                         recovery_time = cycle_time - 61;
 249                                 } else
 250                                         printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
 251                                 break;
 252                         default:
 253                                 if (cycle_time >= 180) {
 254                                         active_time = 110;
 255                                         recovery_time = cycle_time - 120;
 256                                 } else {
 257                                         active_time = ide_pio_timings[pio].active_time;
 258                                         recovery_time = cycle_time - active_time;
 259                                 }
 260                 }
 261                 printk(KERN_INFO "%s: PIO mode%d\n", drive->name,pio);
 262         }
 263
 264         if (!HWIF(drive)->channel && drive->media != ide_disk) {
 265                 outb(0x5f, QD_CONTROL_PORT);
 266                 printk(KERN_WARNING "%s: ATAPI: disabled read-ahead FIFO "
 267                         "and post-write buffer on %s.\n",
 268                         drive->name, HWIF(drive)->name);
 269         }
 270
 271         qd_set_timing(drive, qd6580_compute_timing(active_time, recovery_time));
 272 }
 273
 274 /*
 275  * qd_testreg
 276  *
 277  * tests if the given port is a register
 278  */
 279
 280 static int __init qd_testreg(int port)
 281 {
 282         unsigned long flags;
 283         u8 savereg, readreg;
 284
 285         local_irq_save(flags);
 286         savereg = inb_p(port);
 287         outb_p(QD_TESTVAL, port);       /* safe value */
 288         readreg = inb_p(port);
 289         outb(savereg, port);
 290         local_irq_restore(flags);
 291
 292         if (savereg == QD_TESTVAL) {
 293                 printk(KERN_ERR "Outch ! the probe for qd65xx isn't reliable !\n");
 294                 printk(KERN_ERR "Please contact maintainers to tell about your hardware\n");
 295                 printk(KERN_ERR "Assuming qd65xx is not present.\n");
 296                 return 1;
 297         }
 298
 299         return (readreg != QD_TESTVAL);
 300 }
 301
 302 /*
 303  * qd_setup:
 304  *
 305  * called to setup an ata channel : adjusts attributes & links for tuning
 306  */
 307
 308 static void __init qd_setup(ide_hwif_t *hwif, int base, int config,
 309                             unsigned int data0, unsigned int data1)
 310 {
 311         hwif->select_data = base;
 312         hwif->config_data = config;
 313         hwif->drives[0].drive_data = data0;
 314         hwif->drives[1].drive_data = data1;
 315 }
 316
 317 /*
 318  * qd_unsetup:
 319  *
 320  * called to unsetup an ata channel : back to default values, unlinks tuning
 321  */
 322 /*
 323 static void __exit qd_unsetup(ide_hwif_t *hwif)
 324 {
 325         u8 config = hwif->config_data;
 326         int base = hwif->select_data;
 327         void *set_pio_mode = (void *)hwif->set_pio_mode;
 328
 329         if (hwif->chipset != ide_qd65xx)
 330                 return;
 331
 332         printk(KERN_NOTICE "%s: back to defaults\n", hwif->name);
 333
 334         hwif->selectproc = NULL;
 335         hwif->set_pio_mode = NULL;
 336
 337         if (set_pio_mode == (void *)qd6500_set_pio_mode) {
 338                 // will do it for both
 339                 outb(QD6500_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
 340         } else if (set_pio_mode == (void *)qd6580_set_pio_mode) {
 341                 if (QD_CONTROL(hwif) & QD_CONTR_SEC_DISABLED) {
 342                         outb(QD6580_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
 343                         outb(QD6580_DEF_DATA2, QD_TIMREG(&hwif->drives[1]));
 344                 } else {
 345                         outb(hwif->channel ? QD6580_DEF_DATA2 : QD6580_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
 346                 }
 347         } else {
 348                 printk(KERN_WARNING "Unknown qd65xx tuning fonction !\n");
 349                 printk(KERN_WARNING "keeping settings !\n");
 350         }
 351 }
 352 */
 353
 354 static const struct ide_port_info qd65xx_port_info __initdata = {
 355         .chipset                = ide_qd65xx,
 356         .host_flags             = IDE_HFLAG_IO_32BIT |
 357                                   IDE_HFLAG_NO_DMA |
 358                                   IDE_HFLAG_NO_AUTOTUNE,
 359         .pio_mask               = ATA_PIO4,
 360 };
 361
 362 /*
 363  * qd_probe:
 364  *
 365  * looks at the specified baseport, and if qd found, registers & initialises it
 366  * return 1 if another qd may be probed
 367  */
 368
 369 static int __init qd_probe(int base)
 370 {
 371         ide_hwif_t *hwif;
 372         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 373         u8 config;
 374         u8 unit;
 375
 376         config = inb(QD_CONFIG_PORT);
 377
 378         if (! ((config & QD_CONFIG_BASEPORT) >> 1 == (base == 0xb0)) )
 379                 return 1;
 380
 381         unit = ! (config & QD_CONFIG_IDE_BASEPORT);
 382
 383         if ((config & 0xf0) == QD_CONFIG_QD6500) {
 384
 385                 if (qd_testreg(base)) return 1;         /* bad register */
 386
 387                 /* qd6500 found */
 388
 389                 hwif = &ide_hwifs[unit];
 390                 printk(KERN_NOTICE "%s: qd6500 at %#x\n", hwif->name, base);
 391                 printk(KERN_DEBUG "qd6500: config=%#x, ID3=%u\n",
 392                         config, QD_ID3);
 393
 394                 if (config & QD_CONFIG_DISABLED) {
 395                         printk(KERN_WARNING "qd6500 is disabled !\n");
 396                         return 1;
 397                 }
 398
 399                 qd_setup(hwif, base, config, QD6500_DEF_DATA, QD6500_DEF_DATA);
 400
 401                 hwif->set_pio_mode = &qd6500_set_pio_mode;
 402
 403                 idx[unit] = unit;
 404
 405                 ide_device_add(idx, &qd65xx_port_info);
 406
 407                 return 1;
 408         }
 409
 410         if (((config & 0xf0) == QD_CONFIG_QD6580_A) ||
 411             ((config & 0xf0) == QD_CONFIG_QD6580_B)) {
 412
 413                 u8 control;
 414
 415                 if (qd_testreg(base) || qd_testreg(base+0x02)) return 1;
 416                         /* bad registers */
 417
 418                 /* qd6580 found */
 419
 420                 control = inb(QD_CONTROL_PORT);
 421
 422                 printk(KERN_NOTICE "qd6580 at %#x\n", base);
 423                 printk(KERN_DEBUG "qd6580: config=%#x, control=%#x, ID3=%u\n",
 424                         config, control, QD_ID3);
 425
 426                 if (control & QD_CONTR_SEC_DISABLED) {
 427                         /* secondary disabled */
 428
 429                         hwif = &ide_hwifs[unit];
 430                         printk(KERN_INFO "%s: qd6580: single IDE board\n",
 431                                          hwif->name);
 432                         qd_setup(hwif, base, config | (control << 8),
 433                                  QD6580_DEF_DATA, QD6580_DEF_DATA2);
 434
 435                         hwif->set_pio_mode = &qd6580_set_pio_mode;
 436
 437                         idx[unit] = unit;
 438
 439                         ide_device_add(idx, &qd65xx_port_info);
 440
 441                         outb(QD_DEF_CONTR, QD_CONTROL_PORT);
 442
 443                         return 1;
 444                 } else {
 445                         ide_hwif_t *mate;
 446
 447                         hwif = &ide_hwifs[0];
 448                         mate = &ide_hwifs[1];
 449                         /* secondary enabled */
 450                         printk(KERN_INFO "%s&%s: qd6580: dual IDE board\n",
 451                                         hwif->name, mate->name);
 452
 453                         qd_setup(hwif, base, config | (control << 8),
 454                                  QD6580_DEF_DATA, QD6580_DEF_DATA);
 455
 456                         hwif->set_pio_mode = &qd6580_set_pio_mode;
 457
 458                         qd_setup(mate, base, config | (control << 8),
 459                                  QD6580_DEF_DATA2, QD6580_DEF_DATA2);
 460
 461                         mate->set_pio_mode = &qd6580_set_pio_mode;
 462
 463                         idx[0] = 0;
 464                         idx[1] = 1;
 465
 466                         ide_device_add(idx, &qd65xx_port_info);
 467
 468                         outb(QD_DEF_CONTR, QD_CONTROL_PORT);
 469
 470                         return 0; /* no other qd65xx possible */
 471                 }
 472         }
 473         /* no qd65xx found */
 474         return 1;
 475 }
 476
 477 int probe_qd65xx = 0;
 478
 479 module_param_named(probe, probe_qd65xx, bool, 0);
 480 MODULE_PARM_DESC(probe, "probe for QD65xx chipsets");
 481
 482 static 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 module_init(qd65xx_init);
 496
 497 MODULE_AUTHOR("Samuel Thibault");
 498 MODULE_DESCRIPTION("support of qd65xx vlb ide chipset");
 499 MODULE_LICENSE("GPL");