release/src-rt-6.x/linux/linux-2.6/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 static void qd_write_reg (u8 content, unsigned long reg)
  93 {
  94         unsigned long flags;
  95
  96         spin_lock_irqsave(&ide_lock, flags);
  97         outb(content,reg);
  98         spin_unlock_irqrestore(&ide_lock, flags);
  99 }
 100
 101 static u8 __init qd_read_reg (unsigned long reg)
 102 {
 103         unsigned long flags;
 104         u8 read;
 105
 106         spin_lock_irqsave(&ide_lock, flags);
 107         read = inb(reg);
 108         spin_unlock_irqrestore(&ide_lock, flags);
 109         return read;
 110 }
 111
 112 /*
 113  * qd_select:
 114  *
 115  * This routine is invoked from ide.c to prepare for access to a given drive.
 116  */
 117
 118 static void qd_select (ide_drive_t *drive)
 119 {
 120         u8 index = ((   (QD_TIMREG(drive)) & 0x80 ) >> 7) |
 121                         (QD_TIMREG(drive) & 0x02);
 122
 123         if (timings[index] != QD_TIMING(drive))
 124                 qd_write_reg(timings[index] = QD_TIMING(drive), QD_TIMREG(drive));
 125 }
 126
 127 /*
 128  * qd6500_compute_timing
 129  *
 130  * computes the timing value where
 131  *      lower nibble represents active time,   in count of VLB clocks
 132  *      upper nibble represents recovery time, in count of VLB clocks
 133  */
 134
 135 static u8 qd6500_compute_timing (ide_hwif_t *hwif, int active_time, int recovery_time)
 136 {
 137         u8 active_cycle,recovery_cycle;
 138
 139         if (system_bus_clock()<=33) {
 140                 active_cycle =   9  - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 2, 9);
 141                 recovery_cycle = 15 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 0, 15);
 142         } else {
 143                 active_cycle =   8  - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 1, 8);
 144                 recovery_cycle = 18 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 3, 18);
 145         }
 146
 147         return((recovery_cycle<<4) | 0x08 | active_cycle);
 148 }
 149
 150 /*
 151  * qd6580_compute_timing
 152  *
 153  * idem for qd6580
 154  */
 155
 156 static u8 qd6580_compute_timing (int active_time, int recovery_time)
 157 {
 158         u8 active_cycle   = 17 - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 2, 17);
 159         u8 recovery_cycle = 15 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 2, 15);
 160
 161         return((recovery_cycle<<4) | active_cycle);
 162 }
 163
 164 /*
 165  * qd_find_disk_type
 166  *
 167  * tries to find timing from dos driver's table
 168  */
 169
 170 static int qd_find_disk_type (ide_drive_t *drive,
 171                 int *active_time, int *recovery_time)
 172 {
 173         struct qd65xx_timing_s *p;
 174         char model[40];
 175
 176         if (!*drive->id->model) return 0;
 177
 178         strncpy(model,drive->id->model,40);
 179         ide_fixstring(model,40,1); /* byte-swap */
 180
 181         for (p = qd65xx_timing ; p->offset != -1 ; p++) {
 182                 if (!strncmp(p->model, model+p->offset, 4)) {
 183                         printk(KERN_DEBUG "%s: listed !\n", drive->name);
 184                         *active_time = p->active;
 185                         *recovery_time = p->recovery;
 186                         return 1;
 187                 }
 188         }
 189         return 0;
 190 }
 191
 192 /*
 193  * qd_timing_ok:
 194  *
 195  * check whether timings don't conflict
 196  */
 197
 198 static int qd_timing_ok (ide_drive_t drives[])
 199 {
 200         return (IDE_IMPLY(drives[0].present && drives[1].present,
 201                         IDE_IMPLY(QD_TIMREG(drives) == QD_TIMREG(drives+1),
 202                                   QD_TIMING(drives) == QD_TIMING(drives+1))));
 203         /* if same timing register, must be same timing */
 204 }
 205
 206 /*
 207  * qd_set_timing:
 208  *
 209  * records the timing, and enables selectproc as needed
 210  */
 211
 212 static void qd_set_timing (ide_drive_t *drive, u8 timing)
 213 {
 214         ide_hwif_t *hwif = HWIF(drive);
 215
 216         drive->drive_data &= 0xff00;
 217         drive->drive_data |= timing;
 218         if (qd_timing_ok(hwif->drives)) {
 219                 qd_select(drive); /* selects once */
 220                 hwif->selectproc = NULL;
 221         } else
 222                 hwif->selectproc = &qd_select;
 223
 224         printk(KERN_DEBUG "%s: %#x\n", drive->name, timing);
 225 }
 226
 227 /*
 228  * qd6500_tune_drive
 229  */
 230
 231 static void qd6500_tune_drive (ide_drive_t *drive, u8 pio)
 232 {
 233         int active_time   = 175;
 234         int recovery_time = 415; /* worst case values from the dos driver */
 235
 236         if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)
 237                 && drive->id->tPIO && (drive->id->field_valid & 0x02)
 238                 && drive->id->eide_pio >= 240) {
 239
 240                 printk(KERN_INFO "%s: PIO mode%d\n", drive->name,
 241                                 drive->id->tPIO);
 242                 active_time = 110;
 243                 recovery_time = drive->id->eide_pio - 120;
 244         }
 245
 246         qd_set_timing(drive, qd6500_compute_timing(HWIF(drive), active_time, recovery_time));
 247 }
 248
 249 /*
 250  * qd6580_tune_drive
 251  */
 252
 253 static void qd6580_tune_drive (ide_drive_t *drive, u8 pio)
 254 {
 255         ide_pio_data_t d;
 256         int base = HWIF(drive)->select_data;
 257         int active_time   = 175;
 258         int recovery_time = 415; /* worst case values from the dos driver */
 259
 260         if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)) {
 261                 pio = ide_get_best_pio_mode(drive, pio, 4, &d);
 262
 263                 switch (pio) {
 264                         case 0: break;
 265                         case 3:
 266                                 if (d.cycle_time >= 110) {
 267                                         active_time = 86;
 268                                         recovery_time = d.cycle_time - 102;
 269                                 } else
 270                                         printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
 271                                 break;
 272                         case 4:
 273                                 if (d.cycle_time >= 69) {
 274                                         active_time = 70;
 275                                         recovery_time = d.cycle_time - 61;
 276                                 } else
 277                                         printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
 278                                 break;
 279                         default:
 280                                 if (d.cycle_time >= 180) {
 281                                         active_time = 110;
 282                                         recovery_time = d.cycle_time - 120;
 283                                 } else {
 284                                         active_time = ide_pio_timings[pio].active_time;
 285                                         recovery_time = d.cycle_time
 286                                                         -active_time;
 287                                 }
 288                 }
 289                 printk(KERN_INFO "%s: PIO mode%d\n", drive->name,pio);
 290         }
 291
 292         if (!HWIF(drive)->channel && drive->media != ide_disk) {
 293                 qd_write_reg(0x5f, QD_CONTROL_PORT);
 294                 printk(KERN_WARNING "%s: ATAPI: disabled read-ahead FIFO "
 295                         "and post-write buffer on %s.\n",
 296                         drive->name, HWIF(drive)->name);
 297         }
 298
 299         qd_set_timing(drive, qd6580_compute_timing(active_time, recovery_time));
 300 }
 301
 302 /*
 303  * qd_testreg
 304  *
 305  * tests if the given port is a register
 306  */
 307
 308 static int __init qd_testreg(int port)
 309 {
 310         u8 savereg;
 311         u8 readreg;
 312         unsigned long flags;
 313
 314         spin_lock_irqsave(&ide_lock, flags);
 315         savereg = inb_p(port);
 316         outb_p(QD_TESTVAL, port);       /* safe value */
 317         readreg = inb_p(port);
 318         outb(savereg, port);
 319         spin_unlock_irqrestore(&ide_lock, flags);
 320
 321         if (savereg == QD_TESTVAL) {
 322                 printk(KERN_ERR "Outch ! the probe for qd65xx isn't reliable !\n");
 323                 printk(KERN_ERR "Please contact maintainers to tell about your hardware\n");
 324                 printk(KERN_ERR "Assuming qd65xx is not present.\n");
 325                 return 1;
 326         }
 327
 328         return (readreg != QD_TESTVAL);
 329 }
 330
 331 /*
 332  * qd_setup:
 333  *
 334  * called to setup an ata channel : adjusts attributes & links for tuning
 335  */
 336
 337 static void __init qd_setup(ide_hwif_t *hwif, int base, int config,
 338                             unsigned int data0, unsigned int data1,
 339                             void (*tuneproc) (ide_drive_t *, u8 pio))
 340 {
 341         hwif->chipset = ide_qd65xx;
 342         hwif->channel = hwif->index;
 343         hwif->select_data = base;
 344         hwif->config_data = config;
 345         hwif->drives[0].drive_data = data0;
 346         hwif->drives[1].drive_data = data1;
 347         hwif->drives[0].io_32bit =
 348         hwif->drives[1].io_32bit = 1;
 349         hwif->tuneproc = tuneproc;
 350         probe_hwif_init(hwif);
 351 }
 352
 353 /*
 354  * qd_unsetup:
 355  *
 356  * called to unsetup an ata channel : back to default values, unlinks tuning
 357  */
 358 /*
 359 static void __exit qd_unsetup(ide_hwif_t *hwif)
 360 {
 361         u8 config = hwif->config_data;
 362         int base = hwif->select_data;
 363         void *tuneproc = (void *) hwif->tuneproc;
 364
 365         if (hwif->chipset != ide_qd65xx)
 366                 return;
 367
 368         printk(KERN_NOTICE "%s: back to defaults\n", hwif->name);
 369
 370         hwif->selectproc = NULL;
 371         hwif->tuneproc = NULL;
 372
 373         if (tuneproc == (void *) qd6500_tune_drive) {
 374                 // will do it for both
 375                 qd_write_reg(QD6500_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
 376         } else if (tuneproc == (void *) qd6580_tune_drive) {
 377                 if (QD_CONTROL(hwif) & QD_CONTR_SEC_DISABLED) {
 378                         qd_write_reg(QD6580_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
 379                         qd_write_reg(QD6580_DEF_DATA2, QD_TIMREG(&hwif->drives[1]));
 380                 } else {
 381                         qd_write_reg(hwif->channel ? QD6580_DEF_DATA2 : QD6580_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
 382                 }
 383         } else {
 384                 printk(KERN_WARNING "Unknown qd65xx tuning fonction !\n");
 385                 printk(KERN_WARNING "keeping settings !\n");
 386         }
 387 }
 388 */
 389
 390 /*
 391  * qd_probe:
 392  *
 393  * looks at the specified baseport, and if qd found, registers & initialises it
 394  * return 1 if another qd may be probed
 395  */
 396
 397 static int __init qd_probe(int base)
 398 {
 399         ide_hwif_t *hwif;
 400         u8 config;
 401         u8 unit;
 402
 403         config = qd_read_reg(QD_CONFIG_PORT);
 404
 405         if (! ((config & QD_CONFIG_BASEPORT) >> 1 == (base == 0xb0)) )
 406                 return 1;
 407
 408         unit = ! (config & QD_CONFIG_IDE_BASEPORT);
 409
 410         if ((config & 0xf0) == QD_CONFIG_QD6500) {
 411
 412                 if (qd_testreg(base)) return 1;         /* bad register */
 413
 414                 /* qd6500 found */
 415
 416                 hwif = &ide_hwifs[unit];
 417                 printk(KERN_NOTICE "%s: qd6500 at %#x\n", hwif->name, base);
 418                 printk(KERN_DEBUG "qd6500: config=%#x, ID3=%u\n",
 419                         config, QD_ID3);
 420
 421                 if (config & QD_CONFIG_DISABLED) {
 422                         printk(KERN_WARNING "qd6500 is disabled !\n");
 423                         return 1;
 424                 }
 425
 426                 qd_setup(hwif, base, config, QD6500_DEF_DATA, QD6500_DEF_DATA,
 427                          &qd6500_tune_drive);
 428
 429                 ide_proc_register_port(hwif);
 430
 431                 return 1;
 432         }
 433
 434         if (((config & 0xf0) == QD_CONFIG_QD6580_A) ||
 435             ((config & 0xf0) == QD_CONFIG_QD6580_B)) {
 436
 437                 u8 control;
 438
 439                 if (qd_testreg(base) || qd_testreg(base+0x02)) return 1;
 440                         /* bad registers */
 441
 442                 /* qd6580 found */
 443
 444                 control = qd_read_reg(QD_CONTROL_PORT);
 445
 446                 printk(KERN_NOTICE "qd6580 at %#x\n", base);
 447                 printk(KERN_DEBUG "qd6580: config=%#x, control=%#x, ID3=%u\n",
 448                         config, control, QD_ID3);
 449
 450                 if (control & QD_CONTR_SEC_DISABLED) {
 451                         /* secondary disabled */
 452
 453                         hwif = &ide_hwifs[unit];
 454                         printk(KERN_INFO "%s: qd6580: single IDE board\n",
 455                                          hwif->name);
 456                         qd_setup(hwif, base, config | (control << 8),
 457                                  QD6580_DEF_DATA, QD6580_DEF_DATA2,
 458                                  &qd6580_tune_drive);
 459                         qd_write_reg(QD_DEF_CONTR,QD_CONTROL_PORT);
 460
 461                         ide_proc_register_port(hwif);
 462
 463                         return 1;
 464                 } else {
 465                         ide_hwif_t *mate;
 466
 467                         hwif = &ide_hwifs[0];
 468                         mate = &ide_hwifs[1];
 469                         /* secondary enabled */
 470                         printk(KERN_INFO "%s&%s: qd6580: dual IDE board\n",
 471                                         hwif->name, mate->name);
 472
 473                         qd_setup(hwif, base, config | (control << 8),
 474                                  QD6580_DEF_DATA, QD6580_DEF_DATA,
 475                                  &qd6580_tune_drive);
 476                         qd_setup(mate, base, config | (control << 8),
 477                                  QD6580_DEF_DATA2, QD6580_DEF_DATA2,
 478                                  &qd6580_tune_drive);
 479                         qd_write_reg(QD_DEF_CONTR,QD_CONTROL_PORT);
 480
 481                         ide_proc_register_port(hwif);
 482                         ide_proc_register_port(mate);
 483
 484                         return 0; /* no other qd65xx possible */
 485                 }
 486         }
 487         /* no qd65xx found */
 488         return 1;
 489 }
 490
 491 int probe_qd65xx = 0;
 492
 493 module_param_named(probe, probe_qd65xx, bool, 0);
 494 MODULE_PARM_DESC(probe, "probe for QD65xx chipsets");
 495
 496 /* Can be called directly from ide.c. */
 497 int __init qd65xx_init(void)
 498 {
 499         if (probe_qd65xx == 0)
 500                 return -ENODEV;
 501
 502         if (qd_probe(0x30))
 503                 qd_probe(0xb0);
 504         if (ide_hwifs[0].chipset != ide_qd65xx &&
 505             ide_hwifs[1].chipset != ide_qd65xx)
 506                 return -ENODEV;
 507         return 0;
 508 }
 509
 510 #ifdef MODULE
 511 module_init(qd65xx_init);
 512 #endif
 513
 514 MODULE_AUTHOR("Samuel Thibault");
 515 MODULE_DESCRIPTION("support of qd65xx vlb ide chipset");
 516 MODULE_LICENSE("GPL");