linux/drivers/ide/qd65xx.c
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   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 * To activate controller support, use "ide0=qd65xx"
  15 */
  16
  17/*
  18 * Rewritten from the work of Colten Edwards <pje120@cs.usask.ca> by
  19 * Samuel Thibault <samuel.thibault@ens-lyon.org>
  20 */
  21
  22#include <linux/module.h>
  23#include <linux/types.h>
  24#include <linux/kernel.h>
  25#include <linux/delay.h>
  26#include <linux/timer.h>
  27#include <linux/mm.h>
  28#include <linux/ioport.h>
  29#include <linux/blkdev.h>
  30#include <linux/ide.h>
  31#include <linux/init.h>
  32#include <asm/io.h>
  33
  34#define DRV_NAME "qd65xx"
  35
  36#include "qd65xx.h"
  37
  38/*
  39 * I/O ports are 0x30-0x31 (and 0x32-0x33 for qd6580)
  40 *            or 0xb0-0xb1 (and 0xb2-0xb3 for qd6580)
  41 *      -- qd6500 is a single IDE interface
  42 *      -- qd6580 is a dual IDE interface
  43 *
  44 * More research on qd6580 being done by willmore@cig.mot.com (David)
  45 * More Information given by Petr Soucek (petr@ryston.cz)
  46 * http://www.ryston.cz/petr/vlb
  47 */
  48
  49/*
  50 * base: Timer1
  51 *
  52 *
  53 * base+0x01: Config (R/O)
  54 *
  55 * bit 0: ide baseport: 1 = 0x1f0 ; 0 = 0x170 (only useful for qd6500)
  56 * bit 1: qd65xx baseport: 1 = 0xb0 ; 0 = 0x30
  57 * bit 2: ID3: bus speed: 1 = <=33MHz ; 0 = >33MHz
  58 * bit 3: qd6500: 1 = disabled, 0 = enabled
  59 *        qd6580: 1
  60 * upper nibble:
  61 *        qd6500: 1100
  62 *        qd6580: either 1010 or 0101
  63 *
  64 *
  65 * base+0x02: Timer2 (qd6580 only)
  66 *
  67 *
  68 * base+0x03: Control (qd6580 only)
  69 *
  70 * bits 0-3 must always be set 1
  71 * bit 4 must be set 1, but is set 0 by dos driver while measuring vlb clock
  72 * bit 0 : 1 = Only primary port enabled : channel 0 for hda, channel 1 for hdb
  73 *         0 = Primary and Secondary ports enabled : channel 0 for hda & hdb
  74 *                                                   channel 1 for hdc & hdd
  75 * bit 1 : 1 = only disks on primary port
  76 *         0 = disks & ATAPI devices on primary port
  77 * bit 2-4 : always 0
  78 * bit 5 : status, but of what ?
  79 * bit 6 : always set 1 by dos driver
  80 * bit 7 : set 1 for non-ATAPI devices on primary port
  81 *      (maybe read-ahead and post-write buffer ?)
  82 */
  83
  84static int timings[4]={-1,-1,-1,-1}; /* stores current timing for each timer */
  85
  86/*
  87 * qd65xx_select:
  88 *
  89 * This routine is invoked to prepare for access to a given drive.
  90 */
  91
  92static void qd65xx_dev_select(ide_drive_t *drive)
  93{
  94        u8 index = ((   (QD_TIMREG(drive)) & 0x80 ) >> 7) |
  95                        (QD_TIMREG(drive) & 0x02);
  96
  97        if (timings[index] != QD_TIMING(drive))
  98                outb(timings[index] = QD_TIMING(drive), QD_TIMREG(drive));
  99
 100        outb(drive->select | ATA_DEVICE_OBS, drive->hwif->io_ports.device_addr);
 101}
 102
 103/*
 104 * qd6500_compute_timing
 105 *
 106 * computes the timing value where
 107 *      lower nibble represents active time,   in count of VLB clocks
 108 *      upper nibble represents recovery time, in count of VLB clocks
 109 */
 110
 111static u8 qd6500_compute_timing (ide_hwif_t *hwif, int active_time, int recovery_time)
 112{
 113        int clk = ide_vlb_clk ? ide_vlb_clk : 50;
 114        u8 act_cyc, rec_cyc;
 115
 116        if (clk <= 33) {
 117                act_cyc =  9 - IDE_IN(active_time   * clk / 1000 + 1, 2,  9);
 118                rec_cyc = 15 - IDE_IN(recovery_time * clk / 1000 + 1, 0, 15);
 119        } else {
 120                act_cyc =  8 - IDE_IN(active_time   * clk / 1000 + 1, 1,  8);
 121                rec_cyc = 18 - IDE_IN(recovery_time * clk / 1000 + 1, 3, 18);
 122        }
 123
 124        return (rec_cyc << 4) | 0x08 | act_cyc;
 125}
 126
 127/*
 128 * qd6580_compute_timing
 129 *
 130 * idem for qd6580
 131 */
 132
 133static u8 qd6580_compute_timing (int active_time, int recovery_time)
 134{
 135        int clk = ide_vlb_clk ? ide_vlb_clk : 50;
 136        u8 act_cyc, rec_cyc;
 137
 138        act_cyc = 17 - IDE_IN(active_time   * clk / 1000 + 1, 2, 17);
 139        rec_cyc = 15 - IDE_IN(recovery_time * clk / 1000 + 1, 2, 15);
 140
 141        return (rec_cyc << 4) | act_cyc;
 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 *m = (char *)&drive->id[ATA_ID_PROD];
 155        char model[ATA_ID_PROD_LEN];
 156
 157        if (*m == 0)
 158                return 0;
 159
 160        strncpy(model, m, ATA_ID_PROD_LEN);
 161        ide_fixstring(model, ATA_ID_PROD_LEN, 1); /* byte-swap */
 162
 163        for (p = qd65xx_timing ; p->offset != -1 ; p++) {
 164                if (!strncmp(p->model, model+p->offset, 4)) {
 165                        printk(KERN_DEBUG "%s: listed !\n", drive->name);
 166                        *active_time = p->active;
 167                        *recovery_time = p->recovery;
 168                        return 1;
 169                }
 170        }
 171        return 0;
 172}
 173
 174/*
 175 * qd_set_timing:
 176 *
 177 * records the timing
 178 */
 179
 180static void qd_set_timing (ide_drive_t *drive, u8 timing)
 181{
 182        unsigned long data = (unsigned long)ide_get_drivedata(drive);
 183
 184        data &= 0xff00;
 185        data |= timing;
 186        ide_set_drivedata(drive, (void *)data);
 187
 188        printk(KERN_DEBUG "%s: %#x\n", drive->name, timing);
 189}
 190
 191static void qd6500_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 192{
 193        u16 *id = drive->id;
 194        int active_time   = 175;
 195        int recovery_time = 415; /* worst case values from the dos driver */
 196
 197        /* FIXME: use drive->pio_mode value */
 198        if (!qd_find_disk_type(drive, &active_time, &recovery_time) &&
 199            (id[ATA_ID_OLD_PIO_MODES] & 0xff) && (id[ATA_ID_FIELD_VALID] & 2) &&
 200            id[ATA_ID_EIDE_PIO] >= 240) {
 201                printk(KERN_INFO "%s: PIO mode%d\n", drive->name,
 202                        id[ATA_ID_OLD_PIO_MODES] & 0xff);
 203                active_time = 110;
 204                recovery_time = drive->id[ATA_ID_EIDE_PIO] - 120;
 205        }
 206
 207        qd_set_timing(drive, qd6500_compute_timing(drive->hwif,
 208                                active_time, recovery_time));
 209}
 210
 211static void qd6580_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 212{
 213        const u8 pio = drive->pio_mode - XFER_PIO_0;
 214        struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
 215        unsigned int cycle_time;
 216        int active_time   = 175;
 217        int recovery_time = 415; /* worst case values from the dos driver */
 218        u8 base = (hwif->config_data & 0xff00) >> 8;
 219
 220        if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)) {
 221                cycle_time = ide_pio_cycle_time(drive, pio);
 222
 223                switch (pio) {
 224                        case 0: break;
 225                        case 3:
 226                                if (cycle_time >= 110) {
 227                                        active_time = 86;
 228                                        recovery_time = cycle_time - 102;
 229                                } else
 230                                        printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
 231                                break;
 232                        case 4:
 233                                if (cycle_time >= 69) {
 234                                        active_time = 70;
 235                                        recovery_time = cycle_time - 61;
 236                                } else
 237                                        printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
 238                                break;
 239                        default:
 240                                if (cycle_time >= 180) {
 241                                        active_time = 110;
 242                                        recovery_time = cycle_time - 120;
 243                                } else {
 244                                        active_time = t->active;
 245                                        recovery_time = cycle_time - active_time;
 246                                }
 247                }
 248                printk(KERN_INFO "%s: PIO mode%d\n", drive->name,pio);
 249        }
 250
 251        if (!hwif->channel && drive->media != ide_disk) {
 252                outb(0x5f, QD_CONTROL_PORT);
 253                printk(KERN_WARNING "%s: ATAPI: disabled read-ahead FIFO "
 254                        "and post-write buffer on %s.\n",
 255                        drive->name, hwif->name);
 256        }
 257
 258        qd_set_timing(drive, qd6580_compute_timing(active_time, recovery_time));
 259}
 260
 261/*
 262 * qd_testreg
 263 *
 264 * tests if the given port is a register
 265 */
 266
 267static int __init qd_testreg(int port)
 268{
 269        unsigned long flags;
 270        u8 savereg, readreg;
 271
 272        local_irq_save(flags);
 273        savereg = inb_p(port);
 274        outb_p(QD_TESTVAL, port);       /* safe value */
 275        readreg = inb_p(port);
 276        outb(savereg, port);
 277        local_irq_restore(flags);
 278
 279        if (savereg == QD_TESTVAL) {
 280                printk(KERN_ERR "Outch ! the probe for qd65xx isn't reliable !\n");
 281                printk(KERN_ERR "Please contact maintainers to tell about your hardware\n");
 282                printk(KERN_ERR "Assuming qd65xx is not present.\n");
 283                return 1;
 284        }
 285
 286        return (readreg != QD_TESTVAL);
 287}
 288
 289static void __init qd6500_init_dev(ide_drive_t *drive)
 290{
 291        ide_hwif_t *hwif = drive->hwif;
 292        u8 base = (hwif->config_data & 0xff00) >> 8;
 293        u8 config = QD_CONFIG(hwif);
 294
 295        ide_set_drivedata(drive, (void *)QD6500_DEF_DATA);
 296}
 297
 298static void __init qd6580_init_dev(ide_drive_t *drive)
 299{
 300        ide_hwif_t *hwif = drive->hwif;
 301        u16 t1, t2;
 302        u8 base = (hwif->config_data & 0xff00) >> 8;
 303        u8 config = QD_CONFIG(hwif);
 304
 305        if (hwif->host_flags & IDE_HFLAG_SINGLE) {
 306                t1 = QD6580_DEF_DATA;
 307                t2 = QD6580_DEF_DATA2;
 308        } else
 309                t2 = t1 = hwif->channel ? QD6580_DEF_DATA2 : QD6580_DEF_DATA;
 310
 311        ide_set_drivedata(drive, (void *)((drive->dn & 1) ? t2 : t1));
 312}
 313
 314static const struct ide_tp_ops qd65xx_tp_ops = {
 315        .exec_command           = ide_exec_command,
 316        .read_status            = ide_read_status,
 317        .read_altstatus         = ide_read_altstatus,
 318        .write_devctl           = ide_write_devctl,
 319
 320        .dev_select             = qd65xx_dev_select,
 321        .tf_load                = ide_tf_load,
 322        .tf_read                = ide_tf_read,
 323
 324        .input_data             = ide_input_data,
 325        .output_data            = ide_output_data,
 326};
 327
 328static const struct ide_port_ops qd6500_port_ops = {
 329        .init_dev               = qd6500_init_dev,
 330        .set_pio_mode           = qd6500_set_pio_mode,
 331};
 332
 333static const struct ide_port_ops qd6580_port_ops = {
 334        .init_dev               = qd6580_init_dev,
 335        .set_pio_mode           = qd6580_set_pio_mode,
 336};
 337
 338static const struct ide_port_info qd65xx_port_info __initconst = {
 339        .name                   = DRV_NAME,
 340        .tp_ops                 = &qd65xx_tp_ops,
 341        .chipset                = ide_qd65xx,
 342        .host_flags             = IDE_HFLAG_IO_32BIT |
 343                                  IDE_HFLAG_NO_DMA,
 344        .pio_mask               = ATA_PIO4,
 345};
 346
 347/*
 348 * qd_probe:
 349 *
 350 * looks at the specified baseport, and if qd found, registers & initialises it
 351 * return 1 if another qd may be probed
 352 */
 353
 354static int __init qd_probe(int base)
 355{
 356        int rc;
 357        u8 config, unit, control;
 358        struct ide_port_info d = qd65xx_port_info;
 359
 360        config = inb(QD_CONFIG_PORT);
 361
 362        if (! ((config & QD_CONFIG_BASEPORT) >> 1 == (base == 0xb0)) )
 363                return -ENODEV;
 364
 365        unit = ! (config & QD_CONFIG_IDE_BASEPORT);
 366
 367        if (unit)
 368                d.host_flags |= IDE_HFLAG_QD_2ND_PORT;
 369
 370        switch (config & 0xf0) {
 371        case QD_CONFIG_QD6500:
 372                if (qd_testreg(base))
 373                         return -ENODEV;        /* bad register */
 374
 375                if (config & QD_CONFIG_DISABLED) {
 376                        printk(KERN_WARNING "qd6500 is disabled !\n");
 377                        return -ENODEV;
 378                }
 379
 380                printk(KERN_NOTICE "qd6500 at %#x\n", base);
 381                printk(KERN_DEBUG "qd6500: config=%#x, ID3=%u\n",
 382                        config, QD_ID3);
 383
 384                d.port_ops = &qd6500_port_ops;
 385                d.host_flags |= IDE_HFLAG_SINGLE;
 386                break;
 387        case QD_CONFIG_QD6580_A:
 388        case QD_CONFIG_QD6580_B:
 389                if (qd_testreg(base) || qd_testreg(base + 0x02))
 390                        return -ENODEV; /* bad registers */
 391
 392                control = inb(QD_CONTROL_PORT);
 393
 394                printk(KERN_NOTICE "qd6580 at %#x\n", base);
 395                printk(KERN_DEBUG "qd6580: config=%#x, control=%#x, ID3=%u\n",
 396                        config, control, QD_ID3);
 397
 398                outb(QD_DEF_CONTR, QD_CONTROL_PORT);
 399
 400                d.port_ops = &qd6580_port_ops;
 401                if (control & QD_CONTR_SEC_DISABLED)
 402                        d.host_flags |= IDE_HFLAG_SINGLE;
 403
 404                printk(KERN_INFO "qd6580: %s IDE board\n",
 405                        (control & QD_CONTR_SEC_DISABLED) ? "single" : "dual");
 406                break;
 407        default:
 408                return -ENODEV;
 409        }
 410
 411        rc = ide_legacy_device_add(&d, (base << 8) | config);
 412
 413        if (d.host_flags & IDE_HFLAG_SINGLE)
 414                return (rc == 0) ? 1 : rc;
 415
 416        return rc;
 417}
 418
 419static bool probe_qd65xx;
 420
 421module_param_named(probe, probe_qd65xx, bool, 0);
 422MODULE_PARM_DESC(probe, "probe for QD65xx chipsets");
 423
 424static int __init qd65xx_init(void)
 425{
 426        int rc1, rc2 = -ENODEV;
 427
 428        if (probe_qd65xx == 0)
 429                return -ENODEV;
 430
 431        rc1 = qd_probe(0x30);
 432        if (rc1)
 433                rc2 = qd_probe(0xb0);
 434
 435        if (rc1 < 0 && rc2 < 0)
 436                return -ENODEV;
 437
 438        return 0;
 439}
 440
 441module_init(qd65xx_init);
 442
 443MODULE_AUTHOR("Samuel Thibault");
 444MODULE_DESCRIPTION("support of qd65xx vlb ide chipset");
 445MODULE_LICENSE("GPL");
 446
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