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@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/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(drive->hwif,
 206                                 active_time, recovery_time));
 207 }
 208
 209 static void qd6580_set_pio_mode(ide_drive_t *drive, const u8 pio)
 210 {
 211         ide_hwif_t *hwif = drive->hwif;
 212         struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
 213         unsigned int cycle_time;
 214         int active_time   = 175;
 215         int recovery_time = 415; /* worst case values from the dos driver */
 216         u8 base = (hwif->config_data & 0xff00) >> 8;
 217
 218         if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)) {
 219                 cycle_time = ide_pio_cycle_time(drive, pio);
 220
 221                 switch (pio) {
 222                         case 0: break;
 223                         case 3:
 224                                 if (cycle_time >= 110) {
 225                                         active_time = 86;
 226                                         recovery_time = cycle_time - 102;
 227                                 } else
 228                                         printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
 229                                 break;
 230                         case 4:
 231                                 if (cycle_time >= 69) {
 232                                         active_time = 70;
 233                                         recovery_time = cycle_time - 61;
 234                                 } else
 235                                         printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
 236                                 break;
 237                         default:
 238                                 if (cycle_time >= 180) {
 239                                         active_time = 110;
 240                                         recovery_time = cycle_time - 120;
 241                                 } else {
 242                                         active_time = t->active;
 243                                         recovery_time = cycle_time - active_time;
 244                                 }
 245                 }
 246                 printk(KERN_INFO "%s: PIO mode%d\n", drive->name,pio);
 247         }
 248
 249         if (!hwif->channel && drive->media != ide_disk) {
 250                 outb(0x5f, QD_CONTROL_PORT);
 251                 printk(KERN_WARNING "%s: ATAPI: disabled read-ahead FIFO "
 252                         "and post-write buffer on %s.\n",
 253                         drive->name, hwif->name);
 254         }
 255
 256         qd_set_timing(drive, qd6580_compute_timing(active_time, recovery_time));
 257 }
 258
 259 /*
 260  * qd_testreg
 261  *
 262  * tests if the given port is a register
 263  */
 264
 265 static int __init qd_testreg(int port)
 266 {
 267         unsigned long flags;
 268         u8 savereg, readreg;
 269
 270         local_irq_save(flags);
 271         savereg = inb_p(port);
 272         outb_p(QD_TESTVAL, port);       /* safe value */
 273         readreg = inb_p(port);
 274         outb(savereg, port);
 275         local_irq_restore(flags);
 276
 277         if (savereg == QD_TESTVAL) {
 278                 printk(KERN_ERR "Outch ! the probe for qd65xx isn't reliable !\n");
 279                 printk(KERN_ERR "Please contact maintainers to tell about your hardware\n");
 280                 printk(KERN_ERR "Assuming qd65xx is not present.\n");
 281                 return 1;
 282         }
 283
 284         return (readreg != QD_TESTVAL);
 285 }
 286
 287 static void __init qd6500_init_dev(ide_drive_t *drive)
 288 {
 289         ide_hwif_t *hwif = drive->hwif;
 290         u8 base = (hwif->config_data & 0xff00) >> 8;
 291         u8 config = QD_CONFIG(hwif);
 292
 293         drive->drive_data = QD6500_DEF_DATA;
 294 }
 295
 296 static void __init qd6580_init_dev(ide_drive_t *drive)
 297 {
 298         ide_hwif_t *hwif = drive->hwif;
 299         u16 t1, t2;
 300         u8 base = (hwif->config_data & 0xff00) >> 8;
 301         u8 config = QD_CONFIG(hwif);
 302
 303         if (hwif->host_flags & IDE_HFLAG_SINGLE) {
 304                 t1 = QD6580_DEF_DATA;
 305                 t2 = QD6580_DEF_DATA2;
 306         } else
 307                 t2 = t1 = hwif->channel ? QD6580_DEF_DATA2 : QD6580_DEF_DATA;
 308
 309         drive->drive_data = (drive->dn & 1) ? t2 : t1;
 310 }
 311
 312 static const struct ide_port_ops qd6500_port_ops = {
 313         .init_dev               = qd6500_init_dev,
 314         .set_pio_mode           = qd6500_set_pio_mode,
 315         .selectproc             = qd65xx_select,
 316 };
 317
 318 static const struct ide_port_ops qd6580_port_ops = {
 319         .init_dev               = qd6580_init_dev,
 320         .set_pio_mode           = qd6580_set_pio_mode,
 321         .selectproc             = qd65xx_select,
 322 };
 323
 324 static const struct ide_port_info qd65xx_port_info __initdata = {
 325         .name                   = DRV_NAME,
 326         .chipset                = ide_qd65xx,
 327         .host_flags             = IDE_HFLAG_IO_32BIT |
 328                                   IDE_HFLAG_NO_DMA,
 329         .pio_mask               = ATA_PIO4,
 330 };
 331
 332 /*
 333  * qd_probe:
 334  *
 335  * looks at the specified baseport, and if qd found, registers & initialises it
 336  * return 1 if another qd may be probed
 337  */
 338
 339 static int __init qd_probe(int base)
 340 {
 341         int rc;
 342         u8 config, unit, control;
 343         struct ide_port_info d = qd65xx_port_info;
 344
 345         config = inb(QD_CONFIG_PORT);
 346
 347         if (! ((config & QD_CONFIG_BASEPORT) >> 1 == (base == 0xb0)) )
 348                 return -ENODEV;
 349
 350         unit = ! (config & QD_CONFIG_IDE_BASEPORT);
 351
 352         if (unit)
 353                 d.host_flags |= IDE_HFLAG_QD_2ND_PORT;
 354
 355         switch (config & 0xf0) {
 356         case QD_CONFIG_QD6500:
 357                 if (qd_testreg(base))
 358                          return -ENODEV;        /* bad register */
 359
 360                 if (config & QD_CONFIG_DISABLED) {
 361                         printk(KERN_WARNING "qd6500 is disabled !\n");
 362                         return -ENODEV;
 363                 }
 364
 365                 printk(KERN_NOTICE "qd6500 at %#x\n", base);
 366                 printk(KERN_DEBUG "qd6500: config=%#x, ID3=%u\n",
 367                         config, QD_ID3);
 368
 369                 d.port_ops = &qd6500_port_ops;
 370                 d.host_flags |= IDE_HFLAG_SINGLE;
 371                 break;
 372         case QD_CONFIG_QD6580_A:
 373         case QD_CONFIG_QD6580_B:
 374                 if (qd_testreg(base) || qd_testreg(base + 0x02))
 375                         return -ENODEV; /* bad registers */
 376
 377                 control = inb(QD_CONTROL_PORT);
 378
 379                 printk(KERN_NOTICE "qd6580 at %#x\n", base);
 380                 printk(KERN_DEBUG "qd6580: config=%#x, control=%#x, ID3=%u\n",
 381                         config, control, QD_ID3);
 382
 383                 outb(QD_DEF_CONTR, QD_CONTROL_PORT);
 384
 385                 d.port_ops = &qd6580_port_ops;
 386                 if (control & QD_CONTR_SEC_DISABLED)
 387                         d.host_flags |= IDE_HFLAG_SINGLE;
 388
 389                 printk(KERN_INFO "qd6580: %s IDE board\n",
 390                         (control & QD_CONTR_SEC_DISABLED) ? "single" : "dual");
 391                 break;
 392         default:
 393                 return -ENODEV;
 394         }
 395
 396         rc = ide_legacy_device_add(&d, (base << 8) | config);
 397
 398         if (d.host_flags & IDE_HFLAG_SINGLE)
 399                 return (rc == 0) ? 1 : rc;
 400
 401         return rc;
 402 }
 403
 404 static int probe_qd65xx;
 405
 406 module_param_named(probe, probe_qd65xx, bool, 0);
 407 MODULE_PARM_DESC(probe, "probe for QD65xx chipsets");
 408
 409 static int __init qd65xx_init(void)
 410 {
 411         int rc1, rc2 = -ENODEV;
 412
 413         if (probe_qd65xx == 0)
 414                 return -ENODEV;
 415
 416         rc1 = qd_probe(0x30);
 417         if (rc1)
 418                 rc2 = qd_probe(0xb0);
 419
 420         if (rc1 < 0 && rc2 < 0)
 421                 return -ENODEV;
 422
 423         return 0;
 424 }
 425
 426 module_init(qd65xx_init);
 427
 428 MODULE_AUTHOR("Samuel Thibault");
 429 MODULE_DESCRIPTION("support of qd65xx vlb ide chipset");
 430 MODULE_LICENSE("GPL");