drivers/ide/legacy/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/hdreg.h>
  31 #include <linux/ide.h>
  32 #include <linux/init.h>
  33 #include <asm/system.h>
  34 #include <asm/io.h>
  35
  36 #define DRV_NAME "qd65xx"
  37
  38 #include "qd65xx.h"
  39
  40 /*
  41  * I/O ports are 0x30-0x31 (and 0x32-0x33 for qd6580)
  42  *            or 0xb0-0xb1 (and 0xb2-0xb3 for qd6580)
  43  *      -- qd6500 is a single IDE interface
  44  *      -- qd6580 is a dual IDE interface
  45  *
  46  * More research on qd6580 being done by willmore@cig.mot.com (David)
  47  * More Information given by Petr Soucek (petr@ryston.cz)
  48  * http://www.ryston.cz/petr/vlb
  49  */
  50
  51 /*
  52  * base: Timer1
  53  *
  54  *
  55  * base+0x01: Config (R/O)
  56  *
  57  * bit 0: ide baseport: 1 = 0x1f0 ; 0 = 0x170 (only useful for qd6500)
  58  * bit 1: qd65xx baseport: 1 = 0xb0 ; 0 = 0x30
  59  * bit 2: ID3: bus speed: 1 = <=33MHz ; 0 = >33MHz
  60  * bit 3: qd6500: 1 = disabled, 0 = enabled
  61  *        qd6580: 1
  62  * upper nibble:
  63  *        qd6500: 1100
  64  *        qd6580: either 1010 or 0101
  65  *
  66  *
  67  * base+0x02: Timer2 (qd6580 only)
  68  *
  69  *
  70  * base+0x03: Control (qd6580 only)
  71  *
  72  * bits 0-3 must always be set 1
  73  * bit 4 must be set 1, but is set 0 by dos driver while measuring vlb clock
  74  * bit 0 : 1 = Only primary port enabled : channel 0 for hda, channel 1 for hdb
  75  *         0 = Primary and Secondary ports enabled : channel 0 for hda & hdb
  76  *                                                   channel 1 for hdc & hdd
  77  * bit 1 : 1 = only disks on primary port
  78  *         0 = disks & ATAPI devices on primary port
  79  * bit 2-4 : always 0
  80  * bit 5 : status, but of what ?
  81  * bit 6 : always set 1 by dos driver
  82  * bit 7 : set 1 for non-ATAPI devices on primary port
  83  *      (maybe read-ahead and post-write buffer ?)
  84  */
  85
  86 static int timings[4]={-1,-1,-1,-1}; /* stores current timing for each timer */
  87
  88 /*
  89  * qd65xx_select:
  90  *
  91  * This routine is invoked to prepare for access to a given drive.
  92  */
  93
  94 static void qd65xx_select(ide_drive_t *drive)
  95 {
  96         u8 index = ((   (QD_TIMREG(drive)) & 0x80 ) >> 7) |
  97                         (QD_TIMREG(drive) & 0x02);
  98
  99         if (timings[index] != QD_TIMING(drive))
 100                 outb(timings[index] = QD_TIMING(drive), QD_TIMREG(drive));
 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
 111 static u8 qd6500_compute_timing (ide_hwif_t *hwif, int active_time, int recovery_time)
 112 {
 113         int clk = ide_vlb_clk ? ide_vlb_clk : system_bus_clock();
 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
 133 static u8 qd6580_compute_timing (int active_time, int recovery_time)
 134 {
 135         int clk = ide_vlb_clk ? ide_vlb_clk : system_bus_clock();
 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
 150 static 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_set_timing:
 174  *
 175  * records the timing
 176  */
 177
 178 static void qd_set_timing (ide_drive_t *drive, u8 timing)
 179 {
 180         drive->drive_data &= 0xff00;
 181         drive->drive_data |= timing;
 182
 183         printk(KERN_DEBUG "%s: %#x\n", drive->name, timing);
 184 }
 185
 186 static void qd6500_set_pio_mode(ide_drive_t *drive, const u8 pio)
 187 {
 188         int active_time   = 175;
 189         int recovery_time = 415; /* worst case values from the dos driver */
 190
 191         /*
 192          * FIXME: use "pio" value
 193          */
 194         if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)
 195                 && drive->id->tPIO && (drive->id->field_valid & 0x02)
 196                 && drive->id->eide_pio >= 240) {
 197
 198                 printk(KERN_INFO "%s: PIO mode%d\n", drive->name,
 199                                 drive->id->tPIO);
 200                 active_time = 110;
 201                 recovery_time = drive->id->eide_pio - 120;
 202         }
 203
 204         qd_set_timing(drive, qd6500_compute_timing(HWIF(drive), active_time, recovery_time));
 205 }
 206
 207 static void qd6580_set_pio_mode(ide_drive_t *drive, const u8 pio)
 208 {
 209         ide_hwif_t *hwif = drive->hwif;
 210         unsigned int cycle_time;
 211         int active_time   = 175;
 212         int recovery_time = 415; /* worst case values from the dos driver */
 213         u8 base = (hwif->config_data & 0xff00) >> 8;
 214
 215         if (drive->id && !qd_find_disk_type(drive, &active_time, &recovery_time)) {
 216                 cycle_time = ide_pio_cycle_time(drive, pio);
 217
 218                 switch (pio) {
 219                         case 0: break;
 220                         case 3:
 221                                 if (cycle_time >= 110) {
 222                                         active_time = 86;
 223                                         recovery_time = cycle_time - 102;
 224                                 } else
 225                                         printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
 226                                 break;
 227                         case 4:
 228                                 if (cycle_time >= 69) {
 229                                         active_time = 70;
 230                                         recovery_time = cycle_time - 61;
 231                                 } else
 232                                         printk(KERN_WARNING "%s: Strange recovery time !\n",drive->name);
 233                                 break;
 234                         default:
 235                                 if (cycle_time >= 180) {
 236                                         active_time = 110;
 237                                         recovery_time = cycle_time - 120;
 238                                 } else {
 239                                         active_time = ide_pio_timings[pio].active_time;
 240                                         recovery_time = cycle_time - active_time;
 241                                 }
 242                 }
 243                 printk(KERN_INFO "%s: PIO mode%d\n", drive->name,pio);
 244         }
 245
 246         if (!HWIF(drive)->channel && drive->media != ide_disk) {
 247                 outb(0x5f, QD_CONTROL_PORT);
 248                 printk(KERN_WARNING "%s: ATAPI: disabled read-ahead FIFO "
 249                         "and post-write buffer on %s.\n",
 250                         drive->name, HWIF(drive)->name);
 251         }
 252
 253         qd_set_timing(drive, qd6580_compute_timing(active_time, recovery_time));
 254 }
 255
 256 /*
 257  * qd_testreg
 258  *
 259  * tests if the given port is a register
 260  */
 261
 262 static int __init qd_testreg(int port)
 263 {
 264         unsigned long flags;
 265         u8 savereg, readreg;
 266
 267         local_irq_save(flags);
 268         savereg = inb_p(port);
 269         outb_p(QD_TESTVAL, port);       /* safe value */
 270         readreg = inb_p(port);
 271         outb(savereg, port);
 272         local_irq_restore(flags);
 273
 274         if (savereg == QD_TESTVAL) {
 275                 printk(KERN_ERR "Outch ! the probe for qd65xx isn't reliable !\n");
 276                 printk(KERN_ERR "Please contact maintainers to tell about your hardware\n");
 277                 printk(KERN_ERR "Assuming qd65xx is not present.\n");
 278                 return 1;
 279         }
 280
 281         return (readreg != QD_TESTVAL);
 282 }
 283
 284 static void __init qd6500_port_init_devs(ide_hwif_t *hwif)
 285 {
 286         u8 base = (hwif->config_data & 0xff00) >> 8;
 287         u8 config = QD_CONFIG(hwif);
 288
 289         hwif->drives[0].drive_data = QD6500_DEF_DATA;
 290         hwif->drives[1].drive_data = QD6500_DEF_DATA;
 291 }
 292
 293 static void __init qd6580_port_init_devs(ide_hwif_t *hwif)
 294 {
 295         u16 t1, t2;
 296         u8 base = (hwif->config_data & 0xff00) >> 8;
 297         u8 config = QD_CONFIG(hwif);
 298
 299         if (hwif->host_flags & IDE_HFLAG_SINGLE) {
 300                 t1 = QD6580_DEF_DATA;
 301                 t2 = QD6580_DEF_DATA2;
 302         } else
 303                 t2 = t1 = hwif->channel ? QD6580_DEF_DATA2 : QD6580_DEF_DATA;
 304
 305         hwif->drives[0].drive_data = t1;
 306         hwif->drives[1].drive_data = t2;
 307 }
 308
 309 static const struct ide_port_ops qd6500_port_ops = {
 310         .port_init_devs         = qd6500_port_init_devs,
 311         .set_pio_mode           = qd6500_set_pio_mode,
 312         .selectproc             = qd65xx_select,
 313 };
 314
 315 static const struct ide_port_ops qd6580_port_ops = {
 316         .port_init_devs         = qd6580_port_init_devs,
 317         .set_pio_mode           = qd6580_set_pio_mode,
 318         .selectproc             = qd65xx_select,
 319 };
 320
 321 static const struct ide_port_info qd65xx_port_info __initdata = {
 322         .name                   = DRV_NAME,
 323         .chipset                = ide_qd65xx,
 324         .host_flags             = IDE_HFLAG_IO_32BIT |
 325                                   IDE_HFLAG_NO_DMA,
 326         .pio_mask               = ATA_PIO4,
 327 };
 328
 329 /*
 330  * qd_probe:
 331  *
 332  * looks at the specified baseport, and if qd found, registers & initialises it
 333  * return 1 if another qd may be probed
 334  */
 335
 336 static int __init qd_probe(int base)
 337 {
 338         int rc;
 339         u8 config, unit, control;
 340         struct ide_port_info d = qd65xx_port_info;
 341
 342         config = inb(QD_CONFIG_PORT);
 343
 344         if (! ((config & QD_CONFIG_BASEPORT) >> 1 == (base == 0xb0)) )
 345                 return -ENODEV;
 346
 347         unit = ! (config & QD_CONFIG_IDE_BASEPORT);
 348
 349         if (unit)
 350                 d.host_flags |= IDE_HFLAG_QD_2ND_PORT;
 351
 352         switch (config & 0xf0) {
 353         case QD_CONFIG_QD6500:
 354                 if (qd_testreg(base))
 355                          return -ENODEV;        /* bad register */
 356
 357                 if (config & QD_CONFIG_DISABLED) {
 358                         printk(KERN_WARNING "qd6500 is disabled !\n");
 359                         return -ENODEV;
 360                 }
 361
 362                 printk(KERN_NOTICE "qd6500 at %#x\n", base);
 363                 printk(KERN_DEBUG "qd6500: config=%#x, ID3=%u\n",
 364                         config, QD_ID3);
 365
 366                 d.port_ops = &qd6500_port_ops;
 367                 d.host_flags |= IDE_HFLAG_SINGLE;
 368                 break;
 369         case QD_CONFIG_QD6580_A:
 370         case QD_CONFIG_QD6580_B:
 371                 if (qd_testreg(base) || qd_testreg(base + 0x02))
 372                         return -ENODEV; /* bad registers */
 373
 374                 control = inb(QD_CONTROL_PORT);
 375
 376                 printk(KERN_NOTICE "qd6580 at %#x\n", base);
 377                 printk(KERN_DEBUG "qd6580: config=%#x, control=%#x, ID3=%u\n",
 378                         config, control, QD_ID3);
 379
 380                 outb(QD_DEF_CONTR, QD_CONTROL_PORT);
 381
 382                 d.port_ops = &qd6580_port_ops;
 383                 if (control & QD_CONTR_SEC_DISABLED)
 384                         d.host_flags |= IDE_HFLAG_SINGLE;
 385
 386                 printk(KERN_INFO "qd6580: %s IDE board\n",
 387                         (control & QD_CONTR_SEC_DISABLED) ? "single" : "dual");
 388                 break;
 389         default:
 390                 return -ENODEV;
 391         }
 392
 393         rc = ide_legacy_device_add(&d, (base << 8) | config);
 394
 395         if (d.host_flags & IDE_HFLAG_SINGLE)
 396                 return (rc == 0) ? 1 : rc;
 397
 398         return rc;
 399 }
 400
 401 static int probe_qd65xx;
 402
 403 module_param_named(probe, probe_qd65xx, bool, 0);
 404 MODULE_PARM_DESC(probe, "probe for QD65xx chipsets");
 405
 406 static int __init qd65xx_init(void)
 407 {
 408         int rc1, rc2 = -ENODEV;
 409
 410         if (probe_qd65xx == 0)
 411                 return -ENODEV;
 412
 413         rc1 = qd_probe(0x30);
 414         if (rc1)
 415                 rc2 = qd_probe(0xb0);
 416
 417         if (rc1 < 0 && rc2 < 0)
 418                 return -ENODEV;
 419
 420         return 0;
 421 }
 422
 423 module_init(qd65xx_init);
 424
 425 MODULE_AUTHOR("Samuel Thibault");
 426 MODULE_DESCRIPTION("support of qd65xx vlb ide chipset");
 427 MODULE_LICENSE("GPL");