drivers/ide/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  * 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@fnac.net>
  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/system.h>
  33 #include <asm/io.h>
  34
  35 #define DRV_NAME "qd65xx"
  36
  37 #include "qd65xx.h"
  38
  39 /*
  40  * I/O ports are 0x30-0x31 (and 0x32-0x33 for qd6580)
  41  *            or 0xb0-0xb1 (and 0xb2-0xb3 for qd6580)
  42  *      -- qd6500 is a single IDE interface
  43  *      -- qd6580 is a dual IDE interface
  44  *
  45  * More research on qd6580 being done by willmore@cig.mot.com (David)
  46  * More Information given by Petr Soucek (petr@ryston.cz)
  47  * http://www.ryston.cz/petr/vlb
  48  */
  49
  50 /*
  51  * base: Timer1
  52  *
  53  *
  54  * base+0x01: Config (R/O)
  55  *
  56  * bit 0: ide baseport: 1 = 0x1f0 ; 0 = 0x170 (only useful for qd6500)
  57  * bit 1: qd65xx baseport: 1 = 0xb0 ; 0 = 0x30
  58  * bit 2: ID3: bus speed: 1 = <=33MHz ; 0 = >33MHz
  59  * bit 3: qd6500: 1 = disabled, 0 = enabled
  60  *        qd6580: 1
  61  * upper nibble:
  62  *        qd6500: 1100
  63  *        qd6580: either 1010 or 0101
  64  *
  65  *
  66  * base+0x02: Timer2 (qd6580 only)
  67  *
  68  *
  69  * base+0x03: Control (qd6580 only)
  70  *
  71  * bits 0-3 must always be set 1
  72  * bit 4 must be set 1, but is set 0 by dos driver while measuring vlb clock
  73  * bit 0 : 1 = Only primary port enabled : channel 0 for hda, channel 1 for hdb
  74  *         0 = Primary and Secondary ports enabled : channel 0 for hda & hdb
  75  *                                                   channel 1 for hdc & hdd
  76  * bit 1 : 1 = only disks on primary port
  77  *         0 = disks & ATAPI devices on primary port
  78  * bit 2-4 : always 0
  79  * bit 5 : status, but of what ?
  80  * bit 6 : always set 1 by dos driver
  81  * bit 7 : set 1 for non-ATAPI devices on primary port
  82  *      (maybe read-ahead and post-write buffer ?)
  83  */
  84
  85 static int timings[4]={-1,-1,-1,-1}; /* stores current timing for each timer */
  86
  87 /*
  88  * qd65xx_select:
  89  *
  90  * This routine is invoked to prepare for access to a given drive.
  91  */
  92
  93 static void qd65xx_select(ide_drive_t *drive)
  94 {
  95         u8 index = ((   (QD_TIMREG(drive)) & 0x80 ) >> 7) |
  96                         (QD_TIMREG(drive) & 0x02);
  97
  98         if (timings[index] != QD_TIMING(drive))
  99                 outb(timings[index] = QD_TIMING(drive), QD_TIMREG(drive));
 100 }
 101
 102 /*
 103  * qd6500_compute_timing
 104  *
 105  * computes the timing value where
 106  *      lower nibble represents active time,   in count of VLB clocks
 107  *      upper nibble represents recovery time, in count of VLB clocks
 108  */
 109
 110 static u8 qd6500_compute_timing (ide_hwif_t *hwif, int active_time, int recovery_time)
 111 {
 112         int clk = ide_vlb_clk ? ide_vlb_clk : 50;
 113         u8 act_cyc, rec_cyc;
 114
 115         if (clk <= 33) {
 116                 act_cyc =  9 - IDE_IN(active_time   * clk / 1000 + 1, 2,  9);
 117                 rec_cyc = 15 - IDE_IN(recovery_time * clk / 1000 + 1, 0, 15);
 118         } else {
 119                 act_cyc =  8 - IDE_IN(active_time   * clk / 1000 + 1, 1,  8);
 120                 rec_cyc = 18 - IDE_IN(recovery_time * clk / 1000 + 1, 3, 18);
 121         }
 122
 123         return (rec_cyc << 4) | 0x08 | act_cyc;
 124 }
 125
 126 /*
 127  * qd6580_compute_timing
 128  *
 129  * idem for qd6580
 130  */
 131
 132 static u8 qd6580_compute_timing (int active_time, int recovery_time)
 133 {
 134         int clk = ide_vlb_clk ? ide_vlb_clk : 50;
 135         u8 act_cyc, rec_cyc;
 136
 137         act_cyc = 17 - IDE_IN(active_time   * clk / 1000 + 1, 2, 17);
 138         rec_cyc = 15 - IDE_IN(recovery_time * clk / 1000 + 1, 2, 15);
 139
 140         return (rec_cyc << 4) | act_cyc;
 141 }
 142
 143 /*
 144  * qd_find_disk_type
 145  *
 146  * tries to find timing from dos driver's table
 147  */
 148
 149 static int qd_find_disk_type (ide_drive_t *drive,
 150                 int *active_time, int *recovery_time)
 151 {
 152         struct qd65xx_timing_s *p;
 153         char *m = (char *)&drive->id[ATA_ID_PROD];
 154         char model[ATA_ID_PROD_LEN];
 155
 156         if (*m == 0)
 157                 return 0;
 158
 159         strncpy(model, m, ATA_ID_PROD_LEN);
 160         ide_fixstring(model, ATA_ID_PROD_LEN, 1); /* byte-swap */
 161
 162         for (p = qd65xx_timing ; p->offset != -1 ; p++) {
 163                 if (!strncmp(p->model, model+p->offset, 4)) {
 164                         printk(KERN_DEBUG "%s: listed !\n", drive->name);
 165                         *active_time = p->active;
 166                         *recovery_time = p->recovery;
 167                         return 1;
 168                 }
 169         }
 170         return 0;
 171 }
 172
 173 /*
 174  * qd_set_timing:
 175  *
 176  * records the timing
 177  */
 178
 179 static void qd_set_timing (ide_drive_t *drive, u8 timing)
 180 {
 181         drive->drive_data &= 0xff00;
 182         drive->drive_data |= timing;
 183
 184         printk(KERN_DEBUG "%s: %#x\n", drive->name, timing);
 185 }
 186
 187 static void qd6500_set_pio_mode(ide_drive_t *drive, const u8 pio)
 188 {
 189         u16 *id = drive->id;
 190         int active_time   = 175;
 191         int recovery_time = 415; /* worst case values from the dos driver */
 192
 193         /*
 194          * FIXME: use "pio" value
 195          */
 196         if (!qd_find_disk_type(drive, &active_time, &recovery_time) &&
 197             (id[ATA_ID_OLD_PIO_MODES] & 0xff) && (id[ATA_ID_FIELD_VALID] & 2) &&
 198             id[ATA_ID_EIDE_PIO] >= 240) {
 199                 printk(KERN_INFO "%s: PIO mode%d\n", drive->name,
 200                         id[ATA_ID_OLD_PIO_MODES] & 0xff);
 201                 active_time = 110;
 202                 recovery_time = drive->id[ATA_ID_EIDE_PIO] - 120;
 203         }
 204
 205         qd_set_timing(drive, qd6500_compute_timing(HWIF(drive), active_time, recovery_time));
 206 }
 207
 208 static void qd6580_set_pio_mode(ide_drive_t *drive, const u8 pio)
 209 {
 210         ide_hwif_t *hwif = drive->hwif;
 211         struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
 212         unsigned int cycle_time;
 213         int active_time   = 175;
 214         int recovery_time = 415; /* worst case values from the dos driver */
 215         u8 base = (hwif->config_data & 0xff00) >> 8;
 216
 217         if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)) {
 218                 cycle_time = ide_pio_cycle_time(drive, pio);
 219
 220                 switch (pio) {
 221                         case 0: break;
 222                         case 3:
 223                                 if (cycle_time >= 110) {
 224                                         active_time = 86;
 225                                         recovery_time = cycle_time - 102;
 226                                 } else
 227                                         printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
 228                                 break;
 229                         case 4:
 230                                 if (cycle_time >= 69) {
 231                                         active_time = 70;
 232                                         recovery_time = cycle_time - 61;
 233                                 } else
 234                                         printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
 235                                 break;
 236                         default:
 237                                 if (cycle_time >= 180) {
 238                                         active_time = 110;
 239                                         recovery_time = cycle_time - 120;
 240                                 } else {
 241                                         active_time = t->active;
 242                                         recovery_time = cycle_time - active_time;
 243                                 }
 244                 }
 245                 printk(KERN_INFO "%s: PIO mode%d\n", drive->name,pio);
 246         }
 247
 248         if (!HWIF(drive)->channel && drive->media != ide_disk) {
 249                 outb(0x5f, QD_CONTROL_PORT);
 250                 printk(KERN_WARNING "%s: ATAPI: disabled read-ahead FIFO "
 251                         "and post-write buffer on %s.\n",
 252                         drive->name, HWIF(drive)->name);
 253         }
 254
 255         qd_set_timing(drive, qd6580_compute_timing(active_time, recovery_time));
 256 }
 257
 258 /*
 259  * qd_testreg
 260  *
 261  * tests if the given port is a register
 262  */
 263
 264 static int __init qd_testreg(int port)
 265 {
 266         unsigned long flags;
 267         u8 savereg, readreg;
 268
 269         local_irq_save(flags);
 270         savereg = inb_p(port);
 271         outb_p(QD_TESTVAL, port);       /* safe value */
 272         readreg = inb_p(port);
 273         outb(savereg, port);
 274         local_irq_restore(flags);
 275
 276         if (savereg == QD_TESTVAL) {
 277                 printk(KERN_ERR "Outch ! the probe for qd65xx isn't reliable !\n");
 278                 printk(KERN_ERR "Please contact maintainers to tell about your hardware\n");
 279                 printk(KERN_ERR "Assuming qd65xx is not present.\n");
 280                 return 1;
 281         }
 282
 283         return (readreg != QD_TESTVAL);
 284 }
 285
 286 static void __init qd6500_init_dev(ide_drive_t *drive)
 287 {
 288         ide_hwif_t *hwif = drive->hwif;
 289         u8 base = (hwif->config_data & 0xff00) >> 8;
 290         u8 config = QD_CONFIG(hwif);
 291
 292         drive->drive_data = QD6500_DEF_DATA;
 293 }
 294
 295 static void __init qd6580_init_dev(ide_drive_t *drive)
 296 {
 297         ide_hwif_t *hwif = drive->hwif;
 298         u16 t1, t2;
 299         u8 base = (hwif->config_data & 0xff00) >> 8;
 300         u8 config = QD_CONFIG(hwif);
 301
 302         if (hwif->host_flags & IDE_HFLAG_SINGLE) {
 303                 t1 = QD6580_DEF_DATA;
 304                 t2 = QD6580_DEF_DATA2;
 305         } else
 306                 t2 = t1 = hwif->channel ? QD6580_DEF_DATA2 : QD6580_DEF_DATA;
 307
 308         drive->drive_data = (drive->dn & 1) ? t2 : t1;
 309 }
 310
 311 static const struct ide_port_ops qd6500_port_ops = {
 312         .init_dev               = qd6500_init_dev,
 313         .set_pio_mode           = qd6500_set_pio_mode,
 314         .selectproc             = qd65xx_select,
 315 };
 316
 317 static const struct ide_port_ops qd6580_port_ops = {
 318         .init_dev               = qd6580_init_dev,
 319         .set_pio_mode           = qd6580_set_pio_mode,
 320         .selectproc             = qd65xx_select,
 321 };
 322
 323 static const struct ide_port_info qd65xx_port_info __initdata = {
 324         .name                   = DRV_NAME,
 325         .chipset                = ide_qd65xx,
 326         .host_flags             = IDE_HFLAG_IO_32BIT |
 327                                   IDE_HFLAG_NO_DMA,
 328         .pio_mask               = ATA_PIO4,
 329 };
 330
 331 /*
 332  * qd_probe:
 333  *
 334  * looks at the specified baseport, and if qd found, registers & initialises it
 335  * return 1 if another qd may be probed
 336  */
 337
 338 static int __init qd_probe(int base)
 339 {
 340         int rc;
 341         u8 config, unit, control;
 342         struct ide_port_info d = qd65xx_port_info;
 343
 344         config = inb(QD_CONFIG_PORT);
 345
 346         if (! ((config & QD_CONFIG_BASEPORT) >> 1 == (base == 0xb0)) )
 347                 return -ENODEV;
 348
 349         unit = ! (config & QD_CONFIG_IDE_BASEPORT);
 350
 351         if (unit)
 352                 d.host_flags |= IDE_HFLAG_QD_2ND_PORT;
 353
 354         switch (config & 0xf0) {
 355         case QD_CONFIG_QD6500:
 356                 if (qd_testreg(base))
 357                          return -ENODEV;        /* bad register */
 358
 359                 if (config & QD_CONFIG_DISABLED) {
 360                         printk(KERN_WARNING "qd6500 is disabled !\n");
 361                         return -ENODEV;
 362                 }
 363
 364                 printk(KERN_NOTICE "qd6500 at %#x\n", base);
 365                 printk(KERN_DEBUG "qd6500: config=%#x, ID3=%u\n",
 366                         config, QD_ID3);
 367
 368                 d.port_ops = &qd6500_port_ops;
 369                 d.host_flags |= IDE_HFLAG_SINGLE;
 370                 break;
 371         case QD_CONFIG_QD6580_A:
 372         case QD_CONFIG_QD6580_B:
 373                 if (qd_testreg(base) || qd_testreg(base + 0x02))
 374                         return -ENODEV; /* bad registers */
 375
 376                 control = inb(QD_CONTROL_PORT);
 377
 378                 printk(KERN_NOTICE "qd6580 at %#x\n", base);
 379                 printk(KERN_DEBUG "qd6580: config=%#x, control=%#x, ID3=%u\n",
 380                         config, control, QD_ID3);
 381
 382                 outb(QD_DEF_CONTR, QD_CONTROL_PORT);
 383
 384                 d.port_ops = &qd6580_port_ops;
 385                 if (control & QD_CONTR_SEC_DISABLED)
 386                         d.host_flags |= IDE_HFLAG_SINGLE;
 387
 388                 printk(KERN_INFO "qd6580: %s IDE board\n",
 389                         (control & QD_CONTR_SEC_DISABLED) ? "single" : "dual");
 390                 break;
 391         default:
 392                 return -ENODEV;
 393         }
 394
 395         rc = ide_legacy_device_add(&d, (base << 8) | config);
 396
 397         if (d.host_flags & IDE_HFLAG_SINGLE)
 398                 return (rc == 0) ? 1 : rc;
 399
 400         return rc;
 401 }
 402
 403 static int probe_qd65xx;
 404
 405 module_param_named(probe, probe_qd65xx, bool, 0);
 406 MODULE_PARM_DESC(probe, "probe for QD65xx chipsets");
 407
 408 static int __init qd65xx_init(void)
 409 {
 410         int rc1, rc2 = -ENODEV;
 411
 412         if (probe_qd65xx == 0)
 413                 return -ENODEV;
 414
 415         rc1 = qd_probe(0x30);
 416         if (rc1)
 417                 rc2 = qd_probe(0xb0);
 418
 419         if (rc1 < 0 && rc2 < 0)
 420                 return -ENODEV;
 421
 422         return 0;
 423 }
 424
 425 module_init(qd65xx_init);
 426
 427 MODULE_AUTHOR("Samuel Thibault");
 428 MODULE_DESCRIPTION("support of qd65xx vlb ide chipset");
 429 MODULE_LICENSE("GPL");