drivers/ide/legacy/ht6560b.c

   1 /*
   2  *  linux/drivers/ide/legacy/ht6560b.c          Version 0.07    Feb  1, 2000
   3  *
   4  *  Copyright (C) 1995-2000  Linus Torvalds & author (see below)
   5  */
   6
   7 /*
   8  *
   9  *  Version 0.01        Initial version hacked out of ide.c
  10  *
  11  *  Version 0.02        Added support for PIO modes, auto-tune
  12  *
  13  *  Version 0.03        Some cleanups
  14  *
  15  *  Version 0.05        PIO mode cycle timings auto-tune using bus-speed
  16  *
  17  *  Version 0.06        Prefetch mode now defaults no OFF. To set
  18  *                      prefetch mode OFF/ON use "hdparm -p8/-p9".
  19  *                      Unmask irq is disabled when prefetch mode
  20  *                      is enabled.
  21  *
  22  *  Version 0.07        Trying to fix CD-ROM detection problem.
  23  *                      "Prefetch" mode bit OFF for ide disks and
  24  *                      ON for anything else.
  25  *
  26  *
  27  *  HT-6560B EIDE-controller support
  28  *  To activate controller support use kernel parameter "ide0=ht6560b".
  29  *  Use hdparm utility to enable PIO mode support.
  30  *
  31  *  Author:    Mikko Ala-Fossi            <maf@iki.fi>
  32  *             Jan Evert van Grootheest   <janevert@iae.nl>
  33  *
  34  *  Try:  http://www.maf.iki.fi/~maf/ht6560b/
  35  */
  36
  37 #define HT6560B_VERSION "v0.07"
  38
  39 #undef REALLY_SLOW_IO           /* most systems can safely undef this */
  40
  41 #include <linux/module.h>
  42 #include <linux/types.h>
  43 #include <linux/kernel.h>
  44 #include <linux/delay.h>
  45 #include <linux/timer.h>
  46 #include <linux/mm.h>
  47 #include <linux/ioport.h>
  48 #include <linux/blkdev.h>
  49 #include <linux/hdreg.h>
  50 #include <linux/ide.h>
  51 #include <linux/init.h>
  52
  53 #include <asm/io.h>
  54
  55 /* #define DEBUG */  /* remove comments for DEBUG messages */
  56
  57 /*
  58  * The special i/o-port that HT-6560B uses to configuration:
  59  *    bit0 (0x01): "1" selects secondary interface
  60  *    bit2 (0x04): "1" enables FIFO function
  61  *    bit5 (0x20): "1" enables prefetched data read function  (???)
  62  *
  63  * The special i/o-port that HT-6560A uses to configuration:
  64  *    bit0 (0x01): "1" selects secondary interface
  65  *    bit1 (0x02): "1" enables prefetched data read function
  66  *    bit2 (0x04): "0" enables multi-master system            (?)
  67  *    bit3 (0x08): "1" 3 cycle time, "0" 2 cycle time         (?)
  68  */
  69 #define HT_CONFIG_PORT    0x3e6
  70 #define HT_CONFIG(drivea) (u8)(((drivea)->drive_data & 0xff00) >> 8)
  71 /*
  72  * FIFO + PREFETCH (both a/b-model)
  73  */
  74 #define HT_CONFIG_DEFAULT 0x1c /* no prefetch */
  75 /* #define HT_CONFIG_DEFAULT 0x3c */ /* with prefetch */
  76 #define HT_SECONDARY_IF   0x01
  77 #define HT_PREFETCH_MODE  0x20
  78
  79 /*
  80  * ht6560b Timing values:
  81  *
  82  * I reviewed some assembler source listings of htide drivers and found
  83  * out how they setup those cycle time interfacing values, as they at Holtek
  84  * call them. IDESETUP.COM that is supplied with the drivers figures out
  85  * optimal values and fetches those values to drivers. I found out that
  86  * they use IDE_SELECT_REG to fetch timings to the ide board right after
  87  * interface switching. After that it was quite easy to add code to
  88  * ht6560b.c.
  89  *
  90  * IDESETUP.COM gave me values 0x24, 0x45, 0xaa, 0xff that worked fine
  91  * for hda and hdc. But hdb needed higher values to work, so I guess
  92  * that sometimes it is necessary to give higher value than IDESETUP
  93  * gives.   [see cmd640.c for an extreme example of this. -ml]
  94  *
  95  * Perhaps I should explain something about these timing values:
  96  * The higher nibble of value is the Recovery Time  (rt) and the lower nibble
  97  * of the value is the Active Time  (at). Minimum value 2 is the fastest and
  98  * the maximum value 15 is the slowest. Default values should be 15 for both.
  99  * So 0x24 means 2 for rt and 4 for at. Each of the drives should have
 100  * both values, and IDESETUP gives automatically rt=15 st=15 for CDROMs or
 101  * similar. If value is too small there will be all sorts of failures.
 102  *
 103  * Timing byte consists of
 104  *      High nibble:  Recovery Cycle Time  (rt)
 105  *           The valid values range from 2 to 15. The default is 15.
 106  *
 107  *      Low nibble:   Active Cycle Time    (at)
 108  *           The valid values range from 2 to 15. The default is 15.
 109  *
 110  * You can obtain optimized timing values by running Holtek IDESETUP.COM
 111  * for DOS. DOS drivers get their timing values from command line, where
 112  * the first value is the Recovery Time and the second value is the
 113  * Active Time for each drive. Smaller value gives higher speed.
 114  * In case of failures you should probably fall back to a higher value.
 115  */
 116 #define HT_TIMING(drivea) (u8)((drivea)->drive_data & 0x00ff)
 117 #define HT_TIMING_DEFAULT 0xff
 118
 119 /*
 120  * This routine handles interface switching for the peculiar hardware design
 121  * on the F.G.I./Holtek HT-6560B VLB IDE interface.
 122  * The HT-6560B can only enable one IDE port at a time, and requires a
 123  * silly sequence (below) whenever we switch between primary and secondary.
 124  */
 125
 126 /*
 127  * This routine is invoked from ide.c to prepare for access to a given drive.
 128  */
 129 static void ht6560b_selectproc (ide_drive_t *drive)
 130 {
 131         unsigned long flags;
 132         static u8 current_select = 0;
 133         static u8 current_timing = 0;
 134         u8 select, timing;
 135
 136         local_irq_save(flags);
 137
 138         select = HT_CONFIG(drive);
 139         timing = HT_TIMING(drive);
 140
 141         if (select != current_select || timing != current_timing) {
 142                 current_select = select;
 143                 current_timing = timing;
 144                 if (drive->media != ide_disk || !drive->present)
 145                         select |= HT_PREFETCH_MODE;
 146                 (void)inb(HT_CONFIG_PORT);
 147                 (void)inb(HT_CONFIG_PORT);
 148                 (void)inb(HT_CONFIG_PORT);
 149                 (void)inb(HT_CONFIG_PORT);
 150                 outb(select, HT_CONFIG_PORT);
 151                 /*
 152                  * Set timing for this drive:
 153                  */
 154                 outb(timing, IDE_SELECT_REG);
 155                 (void)inb(IDE_STATUS_REG);
 156 #ifdef DEBUG
 157                 printk("ht6560b: %s: select=%#x timing=%#x\n",
 158                         drive->name, select, timing);
 159 #endif
 160         }
 161         local_irq_restore(flags);
 162 }
 163
 164 /*
 165  * Autodetection and initialization of ht6560b
 166  */
 167 static int __init try_to_init_ht6560b(void)
 168 {
 169         u8 orig_value;
 170         int i;
 171
 172         /* Autodetect ht6560b */
 173         if ((orig_value = inb(HT_CONFIG_PORT)) == 0xff)
 174                 return 0;
 175
 176         for (i=3;i>0;i--) {
 177                 outb(0x00, HT_CONFIG_PORT);
 178                 if (!( (~inb(HT_CONFIG_PORT)) & 0x3f )) {
 179                         outb(orig_value, HT_CONFIG_PORT);
 180                         return 0;
 181                 }
 182         }
 183         outb(0x00, HT_CONFIG_PORT);
 184         if ((~inb(HT_CONFIG_PORT))& 0x3f) {
 185                 outb(orig_value, HT_CONFIG_PORT);
 186                 return 0;
 187         }
 188         /*
 189          * Ht6560b autodetected
 190          */
 191         outb(HT_CONFIG_DEFAULT, HT_CONFIG_PORT);
 192         outb(HT_TIMING_DEFAULT, 0x1f6);  /* IDE_SELECT_REG */
 193         (void) inb(0x1f7);               /* IDE_STATUS_REG */
 194
 195         printk("\nht6560b " HT6560B_VERSION
 196                ": chipset detected and initialized"
 197 #ifdef DEBUG
 198                " with debug enabled"
 199 #endif
 200                 );
 201         return 1;
 202 }
 203
 204 static u8 ht_pio2timings(ide_drive_t *drive, u8 pio)
 205 {
 206         int active_time, recovery_time;
 207         int active_cycles, recovery_cycles;
 208         ide_pio_data_t d;
 209         int bus_speed = system_bus_clock();
 210
 211         if (pio) {
 212                 pio = ide_get_best_pio_mode(drive, pio, 5, &d);
 213
 214                 /*
 215                  *  Just like opti621.c we try to calculate the
 216                  *  actual cycle time for recovery and activity
 217                  *  according system bus speed.
 218                  */
 219                 active_time = ide_pio_timings[pio].active_time;
 220                 recovery_time = d.cycle_time
 221                         - active_time
 222                         - ide_pio_timings[pio].setup_time;
 223                 /*
 224                  *  Cycle times should be Vesa bus cycles
 225                  */
 226                 active_cycles   = (active_time   * bus_speed + 999) / 1000;
 227                 recovery_cycles = (recovery_time * bus_speed + 999) / 1000;
 228                 /*
 229                  *  Upper and lower limits
 230                  */
 231                 if (active_cycles   < 2)  active_cycles   = 2;
 232                 if (recovery_cycles < 2)  recovery_cycles = 2;
 233                 if (active_cycles   > 15) active_cycles   = 15;
 234                 if (recovery_cycles > 15) recovery_cycles = 0;  /* 0==16 */
 235
 236 #ifdef DEBUG
 237                 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);
 238 #endif
 239
 240                 return (u8)((recovery_cycles << 4) | active_cycles);
 241         } else {
 242
 243 #ifdef DEBUG
 244                 printk("ht6560b: drive %s setting pio=0\n", drive->name);
 245 #endif
 246
 247                 return HT_TIMING_DEFAULT;    /* default setting */
 248         }
 249 }
 250
 251 /*
 252  *  Enable/Disable so called prefetch mode
 253  */
 254 static void ht_set_prefetch(ide_drive_t *drive, u8 state)
 255 {
 256         unsigned long flags;
 257         int t = HT_PREFETCH_MODE << 8;
 258
 259         spin_lock_irqsave(&ide_lock, flags);
 260
 261         /*
 262          *  Prefetch mode and unmask irq seems to conflict
 263          */
 264         if (state) {
 265                 drive->drive_data |= t;   /* enable prefetch mode */
 266                 drive->no_unmask = 1;
 267                 drive->unmask = 0;
 268         } else {
 269                 drive->drive_data &= ~t;  /* disable prefetch mode */
 270                 drive->no_unmask = 0;
 271         }
 272
 273         spin_unlock_irqrestore(&ide_lock, flags);
 274
 275 #ifdef DEBUG
 276         printk("ht6560b: drive %s prefetch mode %sabled\n", drive->name, (state ? "en" : "dis"));
 277 #endif
 278 }
 279
 280 static void tune_ht6560b (ide_drive_t *drive, u8 pio)
 281 {
 282         unsigned long flags;
 283         u8 timing;
 284
 285         switch (pio) {
 286         case 8:         /* set prefetch off */
 287         case 9:         /* set prefetch on */
 288                 ht_set_prefetch(drive, pio & 1);
 289                 return;
 290         }
 291
 292         timing = ht_pio2timings(drive, pio);
 293
 294         spin_lock_irqsave(&ide_lock, flags);
 295
 296         drive->drive_data &= 0xff00;
 297         drive->drive_data |= timing;
 298
 299         spin_unlock_irqrestore(&ide_lock, flags);
 300
 301 #ifdef DEBUG
 302         printk("ht6560b: drive %s tuned to pio mode %#x timing=%#x\n", drive->name, pio, timing);
 303 #endif
 304 }
 305
 306 /* Can be called directly from ide.c. */
 307 int __init ht6560b_init(void)
 308 {
 309         ide_hwif_t *hwif, *mate;
 310         int t;
 311
 312         hwif = &ide_hwifs[0];
 313         mate = &ide_hwifs[1];
 314
 315         if (!request_region(HT_CONFIG_PORT, 1, hwif->name)) {
 316                 printk(KERN_NOTICE "%s: HT_CONFIG_PORT not found\n",
 317                         __FUNCTION__);
 318                 return -ENODEV;
 319         }
 320
 321         if (!try_to_init_ht6560b()) {
 322                 printk(KERN_NOTICE "%s: HBA not found\n", __FUNCTION__);
 323                 goto release_region;
 324         }
 325
 326         hwif->chipset = ide_ht6560b;
 327         hwif->selectproc = &ht6560b_selectproc;
 328         hwif->tuneproc = &tune_ht6560b;
 329         hwif->serialized = 1;   /* is this needed? */
 330         hwif->mate = mate;
 331
 332         mate->chipset = ide_ht6560b;
 333         mate->selectproc = &ht6560b_selectproc;
 334         mate->tuneproc = &tune_ht6560b;
 335         mate->serialized = 1;   /* is this needed? */
 336         mate->mate = hwif;
 337         mate->channel = 1;
 338
 339         /*
 340          * Setting default configurations for drives
 341          */
 342         t = (HT_CONFIG_DEFAULT << 8);
 343         t |= HT_TIMING_DEFAULT;
 344         hwif->drives[0].drive_data = t;
 345         hwif->drives[1].drive_data = t;
 346
 347         t |= (HT_SECONDARY_IF << 8);
 348         mate->drives[0].drive_data = t;
 349         mate->drives[1].drive_data = t;
 350
 351         probe_hwif_init(hwif);
 352         probe_hwif_init(mate);
 353
 354         create_proc_ide_interfaces();
 355
 356         return 0;
 357
 358 release_region:
 359         release_region(HT_CONFIG_PORT, 1);
 360         return -ENODEV;
 361 }
 362
 363 #ifdef MODULE
 364 module_init(ht6560b_init);
 365 #endif
 366
 367 MODULE_AUTHOR("See Local File");
 368 MODULE_DESCRIPTION("HT-6560B EIDE-controller support");
 369 MODULE_LICENSE("GPL");