linux/drivers/ide/legacy/qd65xx.c
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   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
  90static int timings[4]={-1,-1,-1,-1}; /* stores current timing for each timer */
  91
  92/*
  93 * qd_select:
  94 *
  95 * This routine is invoked from ide.c to prepare for access to a given drive.
  96 */
  97
  98static void qd_select (ide_drive_t *drive)
  99{
 100        u8 index = ((   (QD_TIMREG(drive)) & 0x80 ) >> 7) |
 101                        (QD_TIMREG(drive) & 0x02);
 102
 103        if (timings[index] != QD_TIMING(drive))
 104                outb(timings[index] = QD_TIMING(drive), QD_TIMREG(drive));
 105}
 106
 107/*
 108 * qd6500_compute_timing
 109 *
 110 * computes the timing value where
 111 *      lower nibble represents active time,   in count of VLB clocks
 112 *      upper nibble represents recovery time, in count of VLB clocks
 113 */
 114
 115static u8 qd6500_compute_timing (ide_hwif_t *hwif, int active_time, int recovery_time)
 116{
 117        u8 active_cycle,recovery_cycle;
 118
 119        if (system_bus_clock()<=33) {
 120                active_cycle =   9  - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 2, 9);
 121                recovery_cycle = 15 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 0, 15);
 122        } else {
 123                active_cycle =   8  - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 1, 8);
 124                recovery_cycle = 18 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 3, 18);
 125        }
 126
 127        return((recovery_cycle<<4) | 0x08 | active_cycle);
 128}
 129
 130/*
 131 * qd6580_compute_timing
 132 *
 133 * idem for qd6580
 134 */
 135
 136static u8 qd6580_compute_timing (int active_time, int recovery_time)
 137{
 138        u8 active_cycle   = 17 - IDE_IN(active_time   * system_bus_clock() / 1000 + 1, 2, 17);
 139        u8 recovery_cycle = 15 - IDE_IN(recovery_time * system_bus_clock() / 1000 + 1, 2, 15);
 140
 141        return((recovery_cycle<<4) | active_cycle);
 142}
 143
 144/*
 145 * qd_find_disk_type
 146 *
 147 * tries to find timing from dos driver's table
 148 */
 149
 150static int qd_find_disk_type (ide_drive_t *drive,
 151                int *active_time, int *recovery_time)
 152{
 153        struct qd65xx_timing_s *p;
 154        char model[40];
 155
 156        if (!*drive->id->model) return 0;
 157
 158        strncpy(model,drive->id->model,40);
 159        ide_fixstring(model,40,1); /* byte-swap */
 160
 161        for (p = qd65xx_timing ; p->offset != -1 ; p++) {
 162                if (!strncmp(p->model, model+p->offset, 4)) {
 163                        printk(KERN_DEBUG "%s: listed !\n", drive->name);
 164                        *active_time = p->active;
 165                        *recovery_time = p->recovery;
 166                        return 1;
 167                }
 168        }
 169        return 0;
 170}
 171
 172/*
 173 * qd_timing_ok:
 174 *
 175 * check whether timings don't conflict
 176 */
 177
 178static int qd_timing_ok (ide_drive_t drives[])
 179{
 180        return (IDE_IMPLY(drives[0].present && drives[1].present,
 181                        IDE_IMPLY(QD_TIMREG(drives) == QD_TIMREG(drives+1),
 182                                  QD_TIMING(drives) == QD_TIMING(drives+1))));
 183        /* if same timing register, must be same timing */
 184}
 185
 186/*
 187 * qd_set_timing:
 188 *
 189 * records the timing, and enables selectproc as needed
 190 */
 191
 192static void qd_set_timing (ide_drive_t *drive, u8 timing)
 193{
 194        ide_hwif_t *hwif = HWIF(drive);
 195
 196        drive->drive_data &= 0xff00;
 197        drive->drive_data |= timing;
 198        if (qd_timing_ok(hwif->drives)) {
 199                qd_select(drive); /* selects once */
 200                hwif->selectproc = NULL;
 201        } else
 202                hwif->selectproc = &qd_select;
 203
 204        printk(KERN_DEBUG "%s: %#x\n", drive->name, timing);
 205}
 206
 207static void qd6500_set_pio_mode(ide_drive_t *drive, const u8 pio)
 208{
 209        int active_time   = 175;
 210        int recovery_time = 415; /* worst case values from the dos driver */
 211
 212        /*
 213         * FIXME: use "pio" value
 214         */
 215        if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)
 216                && drive->id->tPIO && (drive->id->field_valid & 0x02)
 217                && drive->id->eide_pio >= 240) {
 218
 219                printk(KERN_INFO "%s: PIO mode%d\n", drive->name,
 220                                drive->id->tPIO);
 221                active_time = 110;
 222                recovery_time = drive->id->eide_pio - 120;
 223        }
 224
 225        qd_set_timing(drive, qd6500_compute_timing(HWIF(drive), active_time, recovery_time));
 226}
 227
 228static void qd6580_set_pio_mode(ide_drive_t *drive, const u8 pio)
 229{
 230        int base = HWIF(drive)->select_data;
 231        unsigned int cycle_time;
 232        int active_time   = 175;
 233        int recovery_time = 415; /* worst case values from the dos driver */
 234
 235        if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)) {
 236                cycle_time = ide_pio_cycle_time(drive, pio);
 237
 238                switch (pio) {
 239                        case 0: break;
 240                        case 3:
 241                                if (cycle_time >= 110) {
 242                                        active_time = 86;
 243                                        recovery_time = cycle_time - 102;
 244                                } else
 245                                        printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
 246                                break;
 247                        case 4:
 248                                if (cycle_time >= 69) {
 249                                        active_time = 70;
 250                                        recovery_time = cycle_time - 61;
 251                                } else
 252                                        printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
 253                                break;
 254                        default:
 255                                if (cycle_time >= 180) {
 256                                        active_time = 110;
 257                                        recovery_time = cycle_time - 120;
 258                                } else {
 259                                        active_time = ide_pio_timings[pio].active_time;
 260                                        recovery_time = cycle_time - active_time;
 261                                }
 262                }
 263                printk(KERN_INFO "%s: PIO mode%d\n", drive->name,pio);
 264        }
 265
 266        if (!HWIF(drive)->channel && drive->media != ide_disk) {
 267                outb(0x5f, QD_CONTROL_PORT);
 268                printk(KERN_WARNING "%s: ATAPI: disabled read-ahead FIFO "
 269                        "and post-write buffer on %s.\n",
 270                        drive->name, HWIF(drive)->name);
 271        }
 272
 273        qd_set_timing(drive, qd6580_compute_timing(active_time, recovery_time));
 274}
 275
 276/*
 277 * qd_testreg
 278 *
 279 * tests if the given port is a register
 280 */
 281
 282static int __init qd_testreg(int port)
 283{
 284        unsigned long flags;
 285        u8 savereg, readreg;
 286
 287        local_irq_save(flags);
 288        savereg = inb_p(port);
 289        outb_p(QD_TESTVAL, port);       /* safe value */
 290        readreg = inb_p(port);
 291        outb(savereg, port);
 292        local_irq_restore(flags);
 293
 294        if (savereg == QD_TESTVAL) {
 295                printk(KERN_ERR "Outch ! the probe for qd65xx isn't reliable !\n");
 296                printk(KERN_ERR "Please contact maintainers to tell about your hardware\n");
 297                printk(KERN_ERR "Assuming qd65xx is not present.\n");
 298                return 1;
 299        }
 300
 301        return (readreg != QD_TESTVAL);
 302}
 303
 304/*
 305 * qd_setup:
 306 *
 307 * called to setup an ata channel : adjusts attributes & links for tuning
 308 */
 309
 310static void __init qd_setup(ide_hwif_t *hwif, int base, int config,
 311                            unsigned int data0, unsigned int data1)
 312{
 313        hwif->chipset = ide_qd65xx;
 314        hwif->channel = hwif->index;
 315        hwif->select_data = base;
 316        hwif->config_data = config;
 317        hwif->drives[0].drive_data = data0;
 318        hwif->drives[1].drive_data = data1;
 319        hwif->drives[0].io_32bit =
 320        hwif->drives[1].io_32bit = 1;
 321        hwif->pio_mask = ATA_PIO4;
 322}
 323
 324/*
 325 * qd_unsetup:
 326 *
 327 * called to unsetup an ata channel : back to default values, unlinks tuning
 328 */
 329/*
 330static void __exit qd_unsetup(ide_hwif_t *hwif)
 331{
 332        u8 config = hwif->config_data;
 333        int base = hwif->select_data;
 334        void *set_pio_mode = (void *)hwif->set_pio_mode;
 335
 336        if (hwif->chipset != ide_qd65xx)
 337                return;
 338
 339        printk(KERN_NOTICE "%s: back to defaults\n", hwif->name);
 340
 341        hwif->selectproc = NULL;
 342        hwif->set_pio_mode = NULL;
 343
 344        if (set_pio_mode == (void *)qd6500_set_pio_mode) {
 345                // will do it for both
 346                outb(QD6500_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
 347        } else if (set_pio_mode == (void *)qd6580_set_pio_mode) {
 348                if (QD_CONTROL(hwif) & QD_CONTR_SEC_DISABLED) {
 349                        outb(QD6580_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
 350                        outb(QD6580_DEF_DATA2, QD_TIMREG(&hwif->drives[1]));
 351                } else {
 352                        outb(hwif->channel ? QD6580_DEF_DATA2 : QD6580_DEF_DATA, QD_TIMREG(&hwif->drives[0]));
 353                }
 354        } else {
 355                printk(KERN_WARNING "Unknown qd65xx tuning fonction !\n");
 356                printk(KERN_WARNING "keeping settings !\n");
 357        }
 358}
 359*/
 360
 361/*
 362 * qd_probe:
 363 *
 364 * looks at the specified baseport, and if qd found, registers & initialises it
 365 * return 1 if another qd may be probed
 366 */
 367
 368static int __init qd_probe(int base)
 369{
 370        ide_hwif_t *hwif;
 371        u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
 372        u8 config;
 373        u8 unit;
 374
 375        config = inb(QD_CONFIG_PORT);
 376
 377        if (! ((config & QD_CONFIG_BASEPORT) >> 1 == (base == 0xb0)) )
 378                return 1;
 379
 380        unit = ! (config & QD_CONFIG_IDE_BASEPORT);
 381
 382        if ((config & 0xf0) == QD_CONFIG_QD6500) {
 383
 384                if (qd_testreg(base)) return 1;         /* bad register */
 385
 386                /* qd6500 found */
 387
 388                hwif = &ide_hwifs[unit];
 389                printk(KERN_NOTICE "%s: qd6500 at %#x\n", hwif->name, base);
 390                printk(KERN_DEBUG "qd6500: config=%#x, ID3=%u\n",
 391                        config, QD_ID3);
 392                
 393                if (config & QD_CONFIG_DISABLED) {
 394                        printk(KERN_WARNING "qd6500 is disabled !\n");
 395                        return 1;
 396                }
 397
 398                qd_setup(hwif, base, config, QD6500_DEF_DATA, QD6500_DEF_DATA);
 399
 400                hwif->set_pio_mode = &qd6500_set_pio_mode;
 401
 402                idx[0] = unit;
 403
 404                ide_device_add(idx);
 405
 406                return 1;
 407        }
 408
 409        if (((config & 0xf0) == QD_CONFIG_QD6580_A) ||
 410            ((config & 0xf0) == QD_CONFIG_QD6580_B)) {
 411
 412                u8 control;
 413
 414                if (qd_testreg(base) || qd_testreg(base+0x02)) return 1;
 415                        /* bad registers */
 416
 417                /* qd6580 found */
 418
 419                control = inb(QD_CONTROL_PORT);
 420
 421                printk(KERN_NOTICE "qd6580 at %#x\n", base);
 422                printk(KERN_DEBUG "qd6580: config=%#x, control=%#x, ID3=%u\n",
 423                        config, control, QD_ID3);
 424
 425                if (control & QD_CONTR_SEC_DISABLED) {
 426                        /* secondary disabled */
 427
 428                        hwif = &ide_hwifs[unit];
 429                        printk(KERN_INFO "%s: qd6580: single IDE board\n",
 430                                         hwif->name);
 431                        qd_setup(hwif, base, config | (control << 8),
 432                                 QD6580_DEF_DATA, QD6580_DEF_DATA2);
 433
 434                        hwif->set_pio_mode = &qd6580_set_pio_mode;
 435
 436                        idx[0] = unit;
 437
 438                        ide_device_add(idx);
 439
 440                        outb(QD_DEF_CONTR, QD_CONTROL_PORT);
 441
 442                        return 1;
 443                } else {
 444                        ide_hwif_t *mate;
 445
 446                        hwif = &ide_hwifs[0];
 447                        mate = &ide_hwifs[1];
 448                        /* secondary enabled */
 449                        printk(KERN_INFO "%s&%s: qd6580: dual IDE board\n",
 450                                        hwif->name, mate->name);
 451
 452                        qd_setup(hwif, base, config | (control << 8),
 453                                 QD6580_DEF_DATA, QD6580_DEF_DATA);
 454
 455                        hwif->set_pio_mode = &qd6580_set_pio_mode;
 456
 457                        qd_setup(mate, base, config | (control << 8),
 458                                 QD6580_DEF_DATA2, QD6580_DEF_DATA2);
 459
 460                        mate->set_pio_mode = &qd6580_set_pio_mode;
 461
 462                        idx[0] = 0;
 463                        idx[1] = 1;
 464
 465                        ide_device_add(idx);
 466
 467                        outb(QD_DEF_CONTR, QD_CONTROL_PORT);
 468
 469                        return 0; /* no other qd65xx possible */
 470                }
 471        }
 472        /* no qd65xx found */
 473        return 1;
 474}
 475
 476int probe_qd65xx = 0;
 477
 478module_param_named(probe, probe_qd65xx, bool, 0);
 479MODULE_PARM_DESC(probe, "probe for QD65xx chipsets");
 480
 481/* Can be called directly from ide.c. */
 482int __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#ifdef MODULE
 496module_init(qd65xx_init);
 497#endif
 498
 499MODULE_AUTHOR("Samuel Thibault");
 500MODULE_DESCRIPTION("support of qd65xx vlb ide chipset");
 501MODULE_LICENSE("GPL");
 502
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