drivers/ide/legacy/ht6560b.c

   1 /*
   2  *  Copyright (C) 1995-2000  Linus Torvalds & author (see below)
   3  */
   4
   5 /*
   6  *
   7  *  Version 0.01        Initial version hacked out of ide.c
   8  *
   9  *  Version 0.02        Added support for PIO modes, auto-tune
  10  *
  11  *  Version 0.03        Some cleanups
  12  *
  13  *  Version 0.05        PIO mode cycle timings auto-tune using bus-speed
  14  *
  15  *  Version 0.06        Prefetch mode now defaults no OFF. To set
  16  *                      prefetch mode OFF/ON use "hdparm -p8/-p9".
  17  *                      Unmask irq is disabled when prefetch mode
  18  *                      is enabled.
  19  *
  20  *  Version 0.07        Trying to fix CD-ROM detection problem.
  21  *                      "Prefetch" mode bit OFF for ide disks and
  22  *                      ON for anything else.
  23  *
  24  *  Version 0.08        Need to force prefetch for CDs and other non-disk
  25  *                      devices. (not sure which devices exactly need
  26  *                      prefetch)
  27  *
  28  *  HT-6560B EIDE-controller support
  29  *  To activate controller support use kernel parameter "ide0=ht6560b".
  30  *  Use hdparm utility to enable PIO mode support.
  31  *
  32  *  Author:    Mikko Ala-Fossi            <maf@iki.fi>
  33  *             Jan Evert van Grootheest   <janevert@caiway.nl>
  34  *
  35  *  Try:  http://www.maf.iki.fi/~maf/ht6560b/
  36  */
  37
  38 #define HT6560B_VERSION "v0.08"
  39
  40 #include <linux/module.h>
  41 #include <linux/types.h>
  42 #include <linux/kernel.h>
  43 #include <linux/delay.h>
  44 #include <linux/timer.h>
  45 #include <linux/mm.h>
  46 #include <linux/ioport.h>
  47 #include <linux/blkdev.h>
  48 #include <linux/hdreg.h>
  49 #include <linux/ide.h>
  50 #include <linux/init.h>
  51
  52 #include <asm/io.h>
  53
  54 /* #define DEBUG */  /* remove comments for DEBUG messages */
  55
  56 /*
  57  * The special i/o-port that HT-6560B uses to configuration:
  58  *    bit0 (0x01): "1" selects secondary interface
  59  *    bit2 (0x04): "1" enables FIFO function
  60  *    bit5 (0x20): "1" enables prefetched data read function  (???)
  61  *
  62  * The special i/o-port that HT-6560A uses to configuration:
  63  *    bit0 (0x01): "1" selects secondary interface
  64  *    bit1 (0x02): "1" enables prefetched data read function
  65  *    bit2 (0x04): "0" enables multi-master system            (?)
  66  *    bit3 (0x08): "1" 3 cycle time, "0" 2 cycle time         (?)
  67  */
  68 #define HT_CONFIG_PORT    0x3e6
  69 #define HT_CONFIG(drivea) (u8)(((drivea)->drive_data & 0xff00) >> 8)
  70 /*
  71  * FIFO + PREFETCH (both a/b-model)
  72  */
  73 #define HT_CONFIG_DEFAULT 0x1c /* no prefetch */
  74 /* #define HT_CONFIG_DEFAULT 0x3c */ /* with prefetch */
  75 #define HT_SECONDARY_IF   0x01
  76 #define HT_PREFETCH_MODE  0x20
  77
  78 /*
  79  * ht6560b Timing values:
  80  *
  81  * I reviewed some assembler source listings of htide drivers and found
  82  * out how they setup those cycle time interfacing values, as they at Holtek
  83  * call them. IDESETUP.COM that is supplied with the drivers figures out
  84  * optimal values and fetches those values to drivers. I found out that
  85  * they use IDE_SELECT_REG to fetch timings to the ide board right after
  86  * interface switching. After that it was quite easy to add code to
  87  * ht6560b.c.
  88  *
  89  * IDESETUP.COM gave me values 0x24, 0x45, 0xaa, 0xff that worked fine
  90  * for hda and hdc. But hdb needed higher values to work, so I guess
  91  * that sometimes it is necessary to give higher value than IDESETUP
  92  * gives.   [see cmd640.c for an extreme example of this. -ml]
  93  *
  94  * Perhaps I should explain something about these timing values:
  95  * The higher nibble of value is the Recovery Time  (rt) and the lower nibble
  96  * of the value is the Active Time  (at). Minimum value 2 is the fastest and
  97  * the maximum value 15 is the slowest. Default values should be 15 for both.
  98  * So 0x24 means 2 for rt and 4 for at. Each of the drives should have
  99  * both values, and IDESETUP gives automatically rt=15 st=15 for CDROMs or
 100  * similar. If value is too small there will be all sorts of failures.
 101  *
 102  * Timing byte consists of
 103  *      High nibble:  Recovery Cycle Time  (rt)
 104  *           The valid values range from 2 to 15. The default is 15.
 105  *
 106  *      Low nibble:   Active Cycle Time    (at)
 107  *           The valid values range from 2 to 15. The default is 15.
 108  *
 109  * You can obtain optimized timing values by running Holtek IDESETUP.COM
 110  * for DOS. DOS drivers get their timing values from command line, where
 111  * the first value is the Recovery Time and the second value is the
 112  * Active Time for each drive. Smaller value gives higher speed.
 113  * In case of failures you should probably fall back to a higher value.
 114  */
 115 #define HT_TIMING(drivea) (u8)((drivea)->drive_data & 0x00ff)
 116 #define HT_TIMING_DEFAULT 0xff
 117
 118 /*
 119  * This routine handles interface switching for the peculiar hardware design
 120  * on the F.G.I./Holtek HT-6560B VLB IDE interface.
 121  * The HT-6560B can only enable one IDE port at a time, and requires a
 122  * silly sequence (below) whenever we switch between primary and secondary.
 123  */
 124
 125 /*
 126  * This routine is invoked from ide.c to prepare for access to a given drive.
 127  */
 128 static void ht6560b_selectproc (ide_drive_t *drive)
 129 {
 130         unsigned long flags;
 131         static u8 current_select = 0;
 132         static u8 current_timing = 0;
 133         u8 select, timing;
 134
 135         local_irq_save(flags);
 136
 137         select = HT_CONFIG(drive);
 138         timing = HT_TIMING(drive);
 139
 140         /*
 141          * Need to enforce prefetch sometimes because otherwise
 142          * it'll hang (hard).
 143          */
 144         if (drive->media != ide_disk || !drive->present)
 145                 select |= HT_PREFETCH_MODE;
 146
 147         if (select != current_select || timing != current_timing) {
 148                 current_select = select;
 149                 current_timing = timing;
 150                 (void)inb(HT_CONFIG_PORT);
 151                 (void)inb(HT_CONFIG_PORT);
 152                 (void)inb(HT_CONFIG_PORT);
 153                 (void)inb(HT_CONFIG_PORT);
 154                 outb(select, HT_CONFIG_PORT);
 155                 /*
 156                  * Set timing for this drive:
 157                  */
 158                 outb(timing, IDE_SELECT_REG);
 159                 (void)inb(IDE_STATUS_REG);
 160 #ifdef DEBUG
 161                 printk("ht6560b: %s: select=%#x timing=%#x\n",
 162                         drive->name, select, timing);
 163 #endif
 164         }
 165         local_irq_restore(flags);
 166 }
 167
 168 /*
 169  * Autodetection and initialization of ht6560b
 170  */
 171 static int __init try_to_init_ht6560b(void)
 172 {
 173         u8 orig_value;
 174         int i;
 175
 176         /* Autodetect ht6560b */
 177         if ((orig_value = inb(HT_CONFIG_PORT)) == 0xff)
 178                 return 0;
 179
 180         for (i=3;i>0;i--) {
 181                 outb(0x00, HT_CONFIG_PORT);
 182                 if (!( (~inb(HT_CONFIG_PORT)) & 0x3f )) {
 183                         outb(orig_value, HT_CONFIG_PORT);
 184                         return 0;
 185                 }
 186         }
 187         outb(0x00, HT_CONFIG_PORT);
 188         if ((~inb(HT_CONFIG_PORT))& 0x3f) {
 189                 outb(orig_value, HT_CONFIG_PORT);
 190                 return 0;
 191         }
 192         /*
 193          * Ht6560b autodetected
 194          */
 195         outb(HT_CONFIG_DEFAULT, HT_CONFIG_PORT);
 196         outb(HT_TIMING_DEFAULT, 0x1f6);  /* IDE_SELECT_REG */
 197         (void) inb(0x1f7);               /* IDE_STATUS_REG */
 198
 199         printk("ht6560b " HT6560B_VERSION
 200                ": chipset detected and initialized"
 201 #ifdef DEBUG
 202                " with debug enabled"
 203 #endif
 204                "\n"
 205                 );
 206         return 1;
 207 }
 208
 209 static u8 ht_pio2timings(ide_drive_t *drive, const u8 pio)
 210 {
 211         int active_time, recovery_time;
 212         int active_cycles, recovery_cycles;
 213         int bus_speed = system_bus_clock();
 214
 215         if (pio) {
 216                 unsigned int cycle_time;
 217
 218                 cycle_time = ide_pio_cycle_time(drive, pio);
 219
 220                 /*
 221                  *  Just like opti621.c we try to calculate the
 222                  *  actual cycle time for recovery and activity
 223                  *  according system bus speed.
 224                  */
 225                 active_time = ide_pio_timings[pio].active_time;
 226                 recovery_time = cycle_time
 227                         - active_time
 228                         - ide_pio_timings[pio].setup_time;
 229                 /*
 230                  *  Cycle times should be Vesa bus cycles
 231                  */
 232                 active_cycles   = (active_time   * bus_speed + 999) / 1000;
 233                 recovery_cycles = (recovery_time * bus_speed + 999) / 1000;
 234                 /*
 235                  *  Upper and lower limits
 236                  */
 237                 if (active_cycles   < 2)  active_cycles   = 2;
 238                 if (recovery_cycles < 2)  recovery_cycles = 2;
 239                 if (active_cycles   > 15) active_cycles   = 15;
 240                 if (recovery_cycles > 15) recovery_cycles = 0;  /* 0==16 */
 241
 242 #ifdef DEBUG
 243                 printk("ht6560b: drive %s setting pio=%d recovery=%d (%dns) active=%d (%dns)\n", drive->name, pio, recovery_cycles, recovery_time, active_cycles, active_time);
 244 #endif
 245
 246                 return (u8)((recovery_cycles << 4) | active_cycles);
 247         } else {
 248
 249 #ifdef DEBUG
 250                 printk("ht6560b: drive %s setting pio=0\n", drive->name);
 251 #endif
 252
 253                 return HT_TIMING_DEFAULT;    /* default setting */
 254         }
 255 }
 256
 257 static DEFINE_SPINLOCK(ht6560b_lock);
 258
 259 /*
 260  *  Enable/Disable so called prefetch mode
 261  */
 262 static void ht_set_prefetch(ide_drive_t *drive, u8 state)
 263 {
 264         unsigned long flags;
 265         int t = HT_PREFETCH_MODE << 8;
 266
 267         spin_lock_irqsave(&ht6560b_lock, flags);
 268
 269         /*
 270          *  Prefetch mode and unmask irq seems to conflict
 271          */
 272         if (state) {
 273                 drive->drive_data |= t;   /* enable prefetch mode */
 274                 drive->no_unmask = 1;
 275                 drive->unmask = 0;
 276         } else {
 277                 drive->drive_data &= ~t;  /* disable prefetch mode */
 278                 drive->no_unmask = 0;
 279         }
 280
 281         spin_unlock_irqrestore(&ht6560b_lock, flags);
 282
 283 #ifdef DEBUG
 284         printk("ht6560b: drive %s prefetch mode %sabled\n", drive->name, (state ? "en" : "dis"));
 285 #endif
 286 }
 287
 288 static void ht6560b_set_pio_mode(ide_drive_t *drive, const u8 pio)
 289 {
 290         unsigned long flags;
 291         u8 timing;
 292
 293         switch (pio) {
 294         case 8:         /* set prefetch off */
 295         case 9:         /* set prefetch on */
 296                 ht_set_prefetch(drive, pio & 1);
 297                 return;
 298         }
 299
 300         timing = ht_pio2timings(drive, pio);
 301
 302         spin_lock_irqsave(&ht6560b_lock, flags);
 303         drive->drive_data &= 0xff00;
 304         drive->drive_data |= timing;
 305         spin_unlock_irqrestore(&ht6560b_lock, flags);
 306
 307 #ifdef DEBUG
 308         printk("ht6560b: drive %s tuned to pio mode %#x timing=%#x\n", drive->name, pio, timing);
 309 #endif
 310 }
 311
 312 static void __init ht6560b_port_init_devs(ide_hwif_t *hwif)
 313 {
 314         /* Setting default configurations for drives. */
 315         int t = (HT_CONFIG_DEFAULT << 8) | HT_TIMING_DEFAULT;
 316
 317         if (hwif->channel)
 318                 t |= (HT_SECONDARY_IF << 8);
 319
 320         hwif->drives[0].drive_data = t;
 321         hwif->drives[1].drive_data = t;
 322 }
 323
 324 int probe_ht6560b = 0;
 325
 326 module_param_named(probe, probe_ht6560b, bool, 0);
 327 MODULE_PARM_DESC(probe, "probe for HT6560B chipset");
 328
 329 static const struct ide_port_info ht6560b_port_info __initdata = {
 330         .chipset                = ide_ht6560b,
 331         .host_flags             = IDE_HFLAG_SERIALIZE | /* is this needed? */
 332                                   IDE_HFLAG_NO_DMA |
 333                                   IDE_HFLAG_NO_AUTOTUNE |
 334                                   IDE_HFLAG_ABUSE_PREFETCH,
 335         .pio_mask               = ATA_PIO4,
 336 };
 337
 338 static int __init ht6560b_init(void)
 339 {
 340         ide_hwif_t *hwif, *mate;
 341         static u8 idx[4] = { 0, 1, 0xff, 0xff };
 342
 343         if (probe_ht6560b == 0)
 344                 return -ENODEV;
 345
 346         hwif = &ide_hwifs[0];
 347         mate = &ide_hwifs[1];
 348
 349         if (!request_region(HT_CONFIG_PORT, 1, hwif->name)) {
 350                 printk(KERN_NOTICE "%s: HT_CONFIG_PORT not found\n",
 351                         __FUNCTION__);
 352                 return -ENODEV;
 353         }
 354
 355         if (!try_to_init_ht6560b()) {
 356                 printk(KERN_NOTICE "%s: HBA not found\n", __FUNCTION__);
 357                 goto release_region;
 358         }
 359
 360         hwif->selectproc = &ht6560b_selectproc;
 361         hwif->set_pio_mode = &ht6560b_set_pio_mode;
 362
 363         mate->selectproc = &ht6560b_selectproc;
 364         mate->set_pio_mode = &ht6560b_set_pio_mode;
 365
 366         hwif->port_init_devs = ht6560b_port_init_devs;
 367         mate->port_init_devs = ht6560b_port_init_devs;
 368
 369         ide_device_add(idx, &ht6560b_port_info);
 370
 371         return 0;
 372
 373 release_region:
 374         release_region(HT_CONFIG_PORT, 1);
 375         return -ENODEV;
 376 }
 377
 378 module_init(ht6560b_init);
 379
 380 MODULE_AUTHOR("See Local File");
 381 MODULE_DESCRIPTION("HT-6560B EIDE-controller support");
 382 MODULE_LICENSE("GPL");