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 #include <linux/module.h>
  40 #include <linux/types.h>
  41 #include <linux/kernel.h>
  42 #include <linux/delay.h>
  43 #include <linux/timer.h>
  44 #include <linux/mm.h>
  45 #include <linux/ioport.h>
  46 #include <linux/blkdev.h>
  47 #include <linux/hdreg.h>
  48 #include <linux/ide.h>
  49 #include <linux/init.h>
  50
  51 #include <asm/io.h>
  52
  53 /* #define DEBUG */  /* remove comments for DEBUG messages */
  54
  55 /*
  56  * The special i/o-port that HT-6560B uses to configuration:
  57  *    bit0 (0x01): "1" selects secondary interface
  58  *    bit2 (0x04): "1" enables FIFO function
  59  *    bit5 (0x20): "1" enables prefetched data read function  (???)
  60  *
  61  * The special i/o-port that HT-6560A uses to configuration:
  62  *    bit0 (0x01): "1" selects secondary interface
  63  *    bit1 (0x02): "1" enables prefetched data read function
  64  *    bit2 (0x04): "0" enables multi-master system            (?)
  65  *    bit3 (0x08): "1" 3 cycle time, "0" 2 cycle time         (?)
  66  */
  67 #define HT_CONFIG_PORT    0x3e6
  68 #define HT_CONFIG(drivea) (u8)(((drivea)->drive_data & 0xff00) >> 8)
  69 /*
  70  * FIFO + PREFETCH (both a/b-model)
  71  */
  72 #define HT_CONFIG_DEFAULT 0x1c /* no prefetch */
  73 /* #define HT_CONFIG_DEFAULT 0x3c */ /* with prefetch */
  74 #define HT_SECONDARY_IF   0x01
  75 #define HT_PREFETCH_MODE  0x20
  76
  77 /*
  78  * ht6560b Timing values:
  79  *
  80  * I reviewed some assembler source listings of htide drivers and found
  81  * out how they setup those cycle time interfacing values, as they at Holtek
  82  * call them. IDESETUP.COM that is supplied with the drivers figures out
  83  * optimal values and fetches those values to drivers. I found out that
  84  * they use IDE_SELECT_REG to fetch timings to the ide board right after
  85  * interface switching. After that it was quite easy to add code to
  86  * ht6560b.c.
  87  *
  88  * IDESETUP.COM gave me values 0x24, 0x45, 0xaa, 0xff that worked fine
  89  * for hda and hdc. But hdb needed higher values to work, so I guess
  90  * that sometimes it is necessary to give higher value than IDESETUP
  91  * gives.   [see cmd640.c for an extreme example of this. -ml]
  92  *
  93  * Perhaps I should explain something about these timing values:
  94  * The higher nibble of value is the Recovery Time  (rt) and the lower nibble
  95  * of the value is the Active Time  (at). Minimum value 2 is the fastest and
  96  * the maximum value 15 is the slowest. Default values should be 15 for both.
  97  * So 0x24 means 2 for rt and 4 for at. Each of the drives should have
  98  * both values, and IDESETUP gives automatically rt=15 st=15 for CDROMs or
  99  * similar. If value is too small there will be all sorts of failures.
 100  *
 101  * Timing byte consists of
 102  *      High nibble:  Recovery Cycle Time  (rt)
 103  *           The valid values range from 2 to 15. The default is 15.
 104  *
 105  *      Low nibble:   Active Cycle Time    (at)
 106  *           The valid values range from 2 to 15. The default is 15.
 107  *
 108  * You can obtain optimized timing values by running Holtek IDESETUP.COM
 109  * for DOS. DOS drivers get their timing values from command line, where
 110  * the first value is the Recovery Time and the second value is the
 111  * Active Time for each drive. Smaller value gives higher speed.
 112  * In case of failures you should probably fall back to a higher value.
 113  */
 114 #define HT_TIMING(drivea) (u8)((drivea)->drive_data & 0x00ff)
 115 #define HT_TIMING_DEFAULT 0xff
 116
 117 /*
 118  * This routine handles interface switching for the peculiar hardware design
 119  * on the F.G.I./Holtek HT-6560B VLB IDE interface.
 120  * The HT-6560B can only enable one IDE port at a time, and requires a
 121  * silly sequence (below) whenever we switch between primary and secondary.
 122  */
 123
 124 /*
 125  * This routine is invoked from ide.c to prepare for access to a given drive.
 126  */
 127 static void ht6560b_selectproc (ide_drive_t *drive)
 128 {
 129         unsigned long flags;
 130         static u8 current_select = 0;
 131         static u8 current_timing = 0;
 132         u8 select, timing;
 133
 134         local_irq_save(flags);
 135
 136         select = HT_CONFIG(drive);
 137         timing = HT_TIMING(drive);
 138
 139         if (select != current_select || timing != current_timing) {
 140                 current_select = select;
 141                 current_timing = timing;
 142                 if (drive->media != ide_disk || !drive->present)
 143                         select |= HT_PREFETCH_MODE;
 144                 (void)inb(HT_CONFIG_PORT);
 145                 (void)inb(HT_CONFIG_PORT);
 146                 (void)inb(HT_CONFIG_PORT);
 147                 (void)inb(HT_CONFIG_PORT);
 148                 outb(select, HT_CONFIG_PORT);
 149                 /*
 150                  * Set timing for this drive:
 151                  */
 152                 outb(timing, IDE_SELECT_REG);
 153                 (void)inb(IDE_STATUS_REG);
 154 #ifdef DEBUG
 155                 printk("ht6560b: %s: select=%#x timing=%#x\n",
 156                         drive->name, select, timing);
 157 #endif
 158         }
 159         local_irq_restore(flags);
 160 }
 161
 162 /*
 163  * Autodetection and initialization of ht6560b
 164  */
 165 static int __init try_to_init_ht6560b(void)
 166 {
 167         u8 orig_value;
 168         int i;
 169
 170         /* Autodetect ht6560b */
 171         if ((orig_value = inb(HT_CONFIG_PORT)) == 0xff)
 172                 return 0;
 173
 174         for (i=3;i>0;i--) {
 175                 outb(0x00, HT_CONFIG_PORT);
 176                 if (!( (~inb(HT_CONFIG_PORT)) & 0x3f )) {
 177                         outb(orig_value, HT_CONFIG_PORT);
 178                         return 0;
 179                 }
 180         }
 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          * Ht6560b autodetected
 188          */
 189         outb(HT_CONFIG_DEFAULT, HT_CONFIG_PORT);
 190         outb(HT_TIMING_DEFAULT, 0x1f6);  /* IDE_SELECT_REG */
 191         (void) inb(0x1f7);               /* IDE_STATUS_REG */
 192
 193         printk("\nht6560b " HT6560B_VERSION
 194                ": chipset detected and initialized"
 195 #ifdef DEBUG
 196                " with debug enabled"
 197 #endif
 198                 );
 199         return 1;
 200 }
 201
 202 static u8 ht_pio2timings(ide_drive_t *drive, const u8 pio)
 203 {
 204         int active_time, recovery_time;
 205         int active_cycles, recovery_cycles;
 206         int bus_speed = system_bus_clock();
 207
 208         if (pio) {
 209                 unsigned int cycle_time;
 210
 211                 cycle_time = ide_pio_cycle_time(drive, pio);
 212
 213                 /*
 214                  *  Just like opti621.c we try to calculate the
 215                  *  actual cycle time for recovery and activity
 216                  *  according system bus speed.
 217                  */
 218                 active_time = ide_pio_timings[pio].active_time;
 219                 recovery_time = cycle_time
 220                         - active_time
 221                         - ide_pio_timings[pio].setup_time;
 222                 /*
 223                  *  Cycle times should be Vesa bus cycles
 224                  */
 225                 active_cycles   = (active_time   * bus_speed + 999) / 1000;
 226                 recovery_cycles = (recovery_time * bus_speed + 999) / 1000;
 227                 /*
 228                  *  Upper and lower limits
 229                  */
 230                 if (active_cycles   < 2)  active_cycles   = 2;
 231                 if (recovery_cycles < 2)  recovery_cycles = 2;
 232                 if (active_cycles   > 15) active_cycles   = 15;
 233                 if (recovery_cycles > 15) recovery_cycles = 0;  /* 0==16 */
 234
 235 #ifdef DEBUG
 236                 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);
 237 #endif
 238
 239                 return (u8)((recovery_cycles << 4) | active_cycles);
 240         } else {
 241
 242 #ifdef DEBUG
 243                 printk("ht6560b: drive %s setting pio=0\n", drive->name);
 244 #endif
 245
 246                 return HT_TIMING_DEFAULT;    /* default setting */
 247         }
 248 }
 249
 250 /*
 251  *  Enable/Disable so called prefetch mode
 252  */
 253 static void ht_set_prefetch(ide_drive_t *drive, u8 state)
 254 {
 255         unsigned long flags;
 256         int t = HT_PREFETCH_MODE << 8;
 257
 258         spin_lock_irqsave(&ide_lock, flags);
 259
 260         /*
 261          *  Prefetch mode and unmask irq seems to conflict
 262          */
 263         if (state) {
 264                 drive->drive_data |= t;   /* enable prefetch mode */
 265                 drive->no_unmask = 1;
 266                 drive->unmask = 0;
 267         } else {
 268                 drive->drive_data &= ~t;  /* disable prefetch mode */
 269                 drive->no_unmask = 0;
 270         }
 271
 272         spin_unlock_irqrestore(&ide_lock, flags);
 273
 274 #ifdef DEBUG
 275         printk("ht6560b: drive %s prefetch mode %sabled\n", drive->name, (state ? "en" : "dis"));
 276 #endif
 277 }
 278
 279 static void ht6560b_set_pio_mode(ide_drive_t *drive, const u8 pio)
 280 {
 281         unsigned long flags;
 282         u8 timing;
 283
 284         switch (pio) {
 285         case 8:         /* set prefetch off */
 286         case 9:         /* set prefetch on */
 287                 ht_set_prefetch(drive, pio & 1);
 288                 return;
 289         }
 290
 291         timing = ht_pio2timings(drive, pio);
 292
 293         spin_lock_irqsave(&ide_lock, flags);
 294
 295         drive->drive_data &= 0xff00;
 296         drive->drive_data |= timing;
 297
 298         spin_unlock_irqrestore(&ide_lock, flags);
 299
 300 #ifdef DEBUG
 301         printk("ht6560b: drive %s tuned to pio mode %#x timing=%#x\n", drive->name, pio, timing);
 302 #endif
 303 }
 304
 305 int probe_ht6560b = 0;
 306
 307 module_param_named(probe, probe_ht6560b, bool, 0);
 308 MODULE_PARM_DESC(probe, "probe for HT6560B chipset");
 309
 310 /* Can be called directly from ide.c. */
 311 int __init ht6560b_init(void)
 312 {
 313         ide_hwif_t *hwif, *mate;
 314         int t;
 315
 316         if (probe_ht6560b == 0)
 317                 return -ENODEV;
 318
 319         hwif = &ide_hwifs[0];
 320         mate = &ide_hwifs[1];
 321
 322         if (!request_region(HT_CONFIG_PORT, 1, hwif->name)) {
 323                 printk(KERN_NOTICE "%s: HT_CONFIG_PORT not found\n",
 324                         __FUNCTION__);
 325                 return -ENODEV;
 326         }
 327
 328         if (!try_to_init_ht6560b()) {
 329                 printk(KERN_NOTICE "%s: HBA not found\n", __FUNCTION__);
 330                 goto release_region;
 331         }
 332
 333         hwif->chipset = ide_ht6560b;
 334         hwif->selectproc = &ht6560b_selectproc;
 335         hwif->host_flags = IDE_HFLAG_ABUSE_PREFETCH;
 336         hwif->pio_mask = ATA_PIO5;
 337         hwif->set_pio_mode = &ht6560b_set_pio_mode;
 338         hwif->serialized = 1;   /* is this needed? */
 339         hwif->mate = mate;
 340
 341         mate->chipset = ide_ht6560b;
 342         mate->selectproc = &ht6560b_selectproc;
 343         mate->host_flags = IDE_HFLAG_ABUSE_PREFETCH;
 344         mate->pio_mask = ATA_PIO5;
 345         mate->set_pio_mode = &ht6560b_set_pio_mode;
 346         mate->serialized = 1;   /* is this needed? */
 347         mate->mate = hwif;
 348         mate->channel = 1;
 349
 350         /*
 351          * Setting default configurations for drives
 352          */
 353         t = (HT_CONFIG_DEFAULT << 8);
 354         t |= HT_TIMING_DEFAULT;
 355         hwif->drives[0].drive_data = t;
 356         hwif->drives[1].drive_data = t;
 357
 358         t |= (HT_SECONDARY_IF << 8);
 359         mate->drives[0].drive_data = t;
 360         mate->drives[1].drive_data = t;
 361
 362         probe_hwif_init(hwif);
 363         probe_hwif_init(mate);
 364
 365         ide_proc_register_port(hwif);
 366         ide_proc_register_port(mate);
 367
 368         return 0;
 369
 370 release_region:
 371         release_region(HT_CONFIG_PORT, 1);
 372         return -ENODEV;
 373 }
 374
 375 #ifdef MODULE
 376 module_init(ht6560b_init);
 377 #endif
 378
 379 MODULE_AUTHOR("See Local File");
 380 MODULE_DESCRIPTION("HT-6560B EIDE-controller support");
 381 MODULE_LICENSE("GPL");