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 {
 310         hwif->select_data = base;
 311         hwif->config_data = config;
 312 }
 313
 314 static void __init qd6500_port_init_devs(ide_hwif_t *hwif)
 315 {
 316         u8 base = hwif->select_data, config = QD_CONFIG(hwif);
 317
 318         hwif->drives[0].drive_data = QD6500_DEF_DATA;
 319         hwif->drives[1].drive_data = QD6500_DEF_DATA;
 320 }
 321
 322 static void __init qd6580_port_init_devs(ide_hwif_t *hwif)
 323 {
 324         u16 t1, t2;
 325         u8 base = hwif->select_data, config = QD_CONFIG(hwif);
 326
 327         if (QD_CONTROL(hwif) & QD_CONTR_SEC_DISABLED) {
 328                 t1 = QD6580_DEF_DATA;
 329                 t2 = QD6580_DEF_DATA2;
 330         } else
 331                 t2 = t1 = hwif->channel ? QD6580_DEF_DATA2 : QD6580_DEF_DATA;
 332
 333         hwif->drives[0].drive_data = t1;
 334         hwif->drives[1].drive_data = t2;
 335 }
 336
 337 static const struct ide_port_info qd65xx_port_info __initdata = {
 338         .chipset                = ide_qd65xx,
 339         .host_flags             = IDE_HFLAG_IO_32BIT |
 340                                   IDE_HFLAG_NO_DMA |
 341                                   IDE_HFLAG_NO_AUTOTUNE,
 342         .pio_mask               = ATA_PIO4,
 343 };
 344
 345 /*
 346  * qd_probe:
 347  *
 348  * looks at the specified baseport, and if qd found, registers & initialises it
 349  * return 1 if another qd may be probed
 350  */
 351
 352 static int __init qd_probe(int base)
 353 {
 354         ide_hwif_t *hwif;
 355         u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 356         u8 config;
 357         u8 unit;
 358
 359         config = inb(QD_CONFIG_PORT);
 360
 361         if (! ((config & QD_CONFIG_BASEPORT) >> 1 == (base == 0xb0)) )
 362                 return 1;
 363
 364         unit = ! (config & QD_CONFIG_IDE_BASEPORT);
 365
 366         if ((config & 0xf0) == QD_CONFIG_QD6500) {
 367
 368                 if (qd_testreg(base)) return 1;         /* bad register */
 369
 370                 /* qd6500 found */
 371
 372                 hwif = &ide_hwifs[unit];
 373                 printk(KERN_NOTICE "%s: qd6500 at %#x\n", hwif->name, base);
 374                 printk(KERN_DEBUG "qd6500: config=%#x, ID3=%u\n",
 375                         config, QD_ID3);
 376
 377                 if (config & QD_CONFIG_DISABLED) {
 378                         printk(KERN_WARNING "qd6500 is disabled !\n");
 379                         return 1;
 380                 }
 381
 382                 qd_setup(hwif, base, config);
 383
 384                 hwif->port_init_devs = qd6500_port_init_devs;
 385                 hwif->set_pio_mode = &qd6500_set_pio_mode;
 386
 387                 idx[unit] = unit;
 388
 389                 ide_device_add(idx, &qd65xx_port_info);
 390
 391                 return 1;
 392         }
 393
 394         if (((config & 0xf0) == QD_CONFIG_QD6580_A) ||
 395             ((config & 0xf0) == QD_CONFIG_QD6580_B)) {
 396
 397                 u8 control;
 398
 399                 if (qd_testreg(base) || qd_testreg(base+0x02)) return 1;
 400                         /* bad registers */
 401
 402                 /* qd6580 found */
 403
 404                 control = inb(QD_CONTROL_PORT);
 405
 406                 printk(KERN_NOTICE "qd6580 at %#x\n", base);
 407                 printk(KERN_DEBUG "qd6580: config=%#x, control=%#x, ID3=%u\n",
 408                         config, control, QD_ID3);
 409
 410                 outb(QD_DEF_CONTR, QD_CONTROL_PORT);
 411
 412                 if (control & QD_CONTR_SEC_DISABLED) {
 413                         /* secondary disabled */
 414
 415                         hwif = &ide_hwifs[unit];
 416                         printk(KERN_INFO "%s: qd6580: single IDE board\n",
 417                                          hwif->name);
 418
 419                         qd_setup(hwif, base, config | (control << 8));
 420
 421                         hwif->port_init_devs = qd6580_port_init_devs;
 422                         hwif->set_pio_mode = &qd6580_set_pio_mode;
 423
 424                         idx[unit] = unit;
 425
 426                         ide_device_add(idx, &qd65xx_port_info);
 427
 428                         return 1;
 429                 } else {
 430                         ide_hwif_t *mate;
 431
 432                         hwif = &ide_hwifs[0];
 433                         mate = &ide_hwifs[1];
 434                         /* secondary enabled */
 435                         printk(KERN_INFO "%s&%s: qd6580: dual IDE board\n",
 436                                         hwif->name, mate->name);
 437
 438                         qd_setup(hwif, base, config | (control << 8));
 439
 440                         hwif->port_init_devs = qd6580_port_init_devs;
 441                         hwif->set_pio_mode = &qd6580_set_pio_mode;
 442
 443                         qd_setup(mate, base, config | (control << 8));
 444
 445                         mate->port_init_devs = qd6580_port_init_devs;
 446                         mate->set_pio_mode = &qd6580_set_pio_mode;
 447
 448                         idx[0] = 0;
 449                         idx[1] = 1;
 450
 451                         ide_device_add(idx, &qd65xx_port_info);
 452
 453                         return 0; /* no other qd65xx possible */
 454                 }
 455         }
 456         /* no qd65xx found */
 457         return 1;
 458 }
 459
 460 int probe_qd65xx = 0;
 461
 462 module_param_named(probe, probe_qd65xx, bool, 0);
 463 MODULE_PARM_DESC(probe, "probe for QD65xx chipsets");
 464
 465 static int __init qd65xx_init(void)
 466 {
 467         if (probe_qd65xx == 0)
 468                 return -ENODEV;
 469
 470         if (qd_probe(0x30))
 471                 qd_probe(0xb0);
 472         if (ide_hwifs[0].chipset != ide_qd65xx &&
 473             ide_hwifs[1].chipset != ide_qd65xx)
 474                 return -ENODEV;
 475         return 0;
 476 }
 477
 478 module_init(qd65xx_init);
 479
 480 MODULE_AUTHOR("Samuel Thibault");
 481 MODULE_DESCRIPTION("support of qd65xx vlb ide chipset");
 482 MODULE_LICENSE("GPL");