linux/drivers/ide/ht6560b.c
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   1/*
   2 *  Copyright (C) 1995-2000  Linus Torvalds & author (see below)
   3 */
   4
   5/*
   6 *  HT-6560B EIDE-controller support
   7 *  To activate controller support use kernel parameter "ide0=ht6560b".
   8 *  Use hdparm utility to enable PIO mode support.
   9 *
  10 *  Author:    Mikko Ala-Fossi            <maf@iki.fi>
  11 *             Jan Evert van Grootheest   <j.e.van.grootheest@caiway.nl>
  12 *
  13 */
  14
  15#define DRV_NAME        "ht6560b"
  16#define HT6560B_VERSION "v0.08"
  17
  18#include <linux/module.h>
  19#include <linux/types.h>
  20#include <linux/kernel.h>
  21#include <linux/delay.h>
  22#include <linux/timer.h>
  23#include <linux/mm.h>
  24#include <linux/ioport.h>
  25#include <linux/blkdev.h>
  26#include <linux/ide.h>
  27#include <linux/init.h>
  28
  29#include <asm/io.h>
  30
  31/* #define DEBUG */  /* remove comments for DEBUG messages */
  32
  33/*
  34 * The special i/o-port that HT-6560B uses to configuration:
  35 *    bit0 (0x01): "1" selects secondary interface
  36 *    bit2 (0x04): "1" enables FIFO function
  37 *    bit5 (0x20): "1" enables prefetched data read function  (???)
  38 *
  39 * The special i/o-port that HT-6560A uses to configuration:
  40 *    bit0 (0x01): "1" selects secondary interface
  41 *    bit1 (0x02): "1" enables prefetched data read function
  42 *    bit2 (0x04): "0" enables multi-master system            (?)
  43 *    bit3 (0x08): "1" 3 cycle time, "0" 2 cycle time         (?)
  44 */
  45#define HT_CONFIG_PORT    0x3e6
  46
  47static inline u8 HT_CONFIG(ide_drive_t *drive)
  48{
  49        return ((unsigned long)ide_get_drivedata(drive) & 0xff00) >> 8;
  50}
  51
  52/*
  53 * FIFO + PREFETCH (both a/b-model)
  54 */
  55#define HT_CONFIG_DEFAULT 0x1c /* no prefetch */
  56/* #define HT_CONFIG_DEFAULT 0x3c */ /* with prefetch */
  57#define HT_SECONDARY_IF   0x01
  58#define HT_PREFETCH_MODE  0x20
  59
  60/*
  61 * ht6560b Timing values:
  62 *
  63 * I reviewed some assembler source listings of htide drivers and found
  64 * out how they setup those cycle time interfacing values, as they at Holtek
  65 * call them. IDESETUP.COM that is supplied with the drivers figures out
  66 * optimal values and fetches those values to drivers. I found out that
  67 * they use Select register to fetch timings to the ide board right after
  68 * interface switching. After that it was quite easy to add code to
  69 * ht6560b.c.
  70 *
  71 * IDESETUP.COM gave me values 0x24, 0x45, 0xaa, 0xff that worked fine
  72 * for hda and hdc. But hdb needed higher values to work, so I guess
  73 * that sometimes it is necessary to give higher value than IDESETUP
  74 * gives.   [see cmd640.c for an extreme example of this. -ml]
  75 *
  76 * Perhaps I should explain something about these timing values:
  77 * The higher nibble of value is the Recovery Time  (rt) and the lower nibble
  78 * of the value is the Active Time  (at). Minimum value 2 is the fastest and
  79 * the maximum value 15 is the slowest. Default values should be 15 for both.
  80 * So 0x24 means 2 for rt and 4 for at. Each of the drives should have
  81 * both values, and IDESETUP gives automatically rt=15 st=15 for CDROMs or
  82 * similar. If value is too small there will be all sorts of failures.
  83 *
  84 * Timing byte consists of
  85 *      High nibble:  Recovery Cycle Time  (rt)
  86 *           The valid values range from 2 to 15. The default is 15.
  87 *
  88 *      Low nibble:   Active Cycle Time    (at)
  89 *           The valid values range from 2 to 15. The default is 15.
  90 *
  91 * You can obtain optimized timing values by running Holtek IDESETUP.COM
  92 * for DOS. DOS drivers get their timing values from command line, where
  93 * the first value is the Recovery Time and the second value is the
  94 * Active Time for each drive. Smaller value gives higher speed.
  95 * In case of failures you should probably fall back to a higher value.
  96 */
  97static inline u8 HT_TIMING(ide_drive_t *drive)
  98{
  99        return (unsigned long)ide_get_drivedata(drive) & 0x00ff;
 100}
 101
 102#define HT_TIMING_DEFAULT 0xff
 103
 104/*
 105 * This routine handles interface switching for the peculiar hardware design
 106 * on the F.G.I./Holtek HT-6560B VLB IDE interface.
 107 * The HT-6560B can only enable one IDE port at a time, and requires a
 108 * silly sequence (below) whenever we switch between primary and secondary.
 109 */
 110
 111/*
 112 * This routine is invoked from ide.c to prepare for access to a given drive.
 113 */
 114static void ht6560b_dev_select(ide_drive_t *drive)
 115{
 116        ide_hwif_t *hwif = drive->hwif;
 117        unsigned long flags;
 118        static u8 current_select = 0;
 119        static u8 current_timing = 0;
 120        u8 select, timing;
 121        
 122        local_irq_save(flags);
 123
 124        select = HT_CONFIG(drive);
 125        timing = HT_TIMING(drive);
 126
 127        /*
 128         * Need to enforce prefetch sometimes because otherwise
 129         * it'll hang (hard).
 130         */
 131        if (drive->media != ide_disk ||
 132            (drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 133                select |= HT_PREFETCH_MODE;
 134
 135        if (select != current_select || timing != current_timing) {
 136                current_select = select;
 137                current_timing = timing;
 138                (void)inb(HT_CONFIG_PORT);
 139                (void)inb(HT_CONFIG_PORT);
 140                (void)inb(HT_CONFIG_PORT);
 141                (void)inb(HT_CONFIG_PORT);
 142                outb(select, HT_CONFIG_PORT);
 143                /*
 144                 * Set timing for this drive:
 145                 */
 146                outb(timing, hwif->io_ports.device_addr);
 147                (void)inb(hwif->io_ports.status_addr);
 148#ifdef DEBUG
 149                printk("ht6560b: %s: select=%#x timing=%#x\n",
 150                        drive->name, select, timing);
 151#endif
 152        }
 153        local_irq_restore(flags);
 154
 155        outb(drive->select | ATA_DEVICE_OBS, hwif->io_ports.device_addr);
 156}
 157
 158/*
 159 * Autodetection and initialization of ht6560b
 160 */
 161static int __init try_to_init_ht6560b(void)
 162{
 163        u8 orig_value;
 164        int i;
 165        
 166        /* Autodetect ht6560b */
 167        if ((orig_value = inb(HT_CONFIG_PORT)) == 0xff)
 168                return 0;
 169        
 170        for (i=3;i>0;i--) {
 171                outb(0x00, HT_CONFIG_PORT);
 172                if (!( (~inb(HT_CONFIG_PORT)) & 0x3f )) {
 173                        outb(orig_value, HT_CONFIG_PORT);
 174                        return 0;
 175                }
 176        }
 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         * Ht6560b autodetected
 184         */
 185        outb(HT_CONFIG_DEFAULT, HT_CONFIG_PORT);
 186        outb(HT_TIMING_DEFAULT, 0x1f6); /* Select register */
 187        (void)inb(0x1f7);               /* Status register */
 188
 189        printk("ht6560b " HT6560B_VERSION
 190               ": chipset detected and initialized"
 191#ifdef DEBUG
 192               " with debug enabled"
 193#endif
 194               "\n"
 195                );
 196        return 1;
 197}
 198
 199static u8 ht_pio2timings(ide_drive_t *drive, const u8 pio)
 200{
 201        int active_time, recovery_time;
 202        int active_cycles, recovery_cycles;
 203        int bus_speed = ide_vlb_clk ? ide_vlb_clk : 50;
 204
 205        if (pio) {
 206                unsigned int cycle_time;
 207                struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
 208
 209                cycle_time = ide_pio_cycle_time(drive, pio);
 210
 211                /*
 212                 *  Just like opti621.c we try to calculate the
 213                 *  actual cycle time for recovery and activity
 214                 *  according system bus speed.
 215                 */
 216                active_time = t->active;
 217                recovery_time = cycle_time - active_time - t->setup;
 218                /*
 219                 *  Cycle times should be Vesa bus cycles
 220                 */
 221                active_cycles   = (active_time   * bus_speed + 999) / 1000;
 222                recovery_cycles = (recovery_time * bus_speed + 999) / 1000;
 223                /*
 224                 *  Upper and lower limits
 225                 */
 226                if (active_cycles   < 2)  active_cycles   = 2;
 227                if (recovery_cycles < 2)  recovery_cycles = 2;
 228                if (active_cycles   > 15) active_cycles   = 15;
 229                if (recovery_cycles > 15) recovery_cycles = 0;  /* 0==16 */
 230                
 231#ifdef DEBUG
 232                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);
 233#endif
 234                
 235                return (u8)((recovery_cycles << 4) | active_cycles);
 236        } else {
 237                
 238#ifdef DEBUG
 239                printk("ht6560b: drive %s setting pio=0\n", drive->name);
 240#endif
 241                
 242                return HT_TIMING_DEFAULT;    /* default setting */
 243        }
 244}
 245
 246static DEFINE_SPINLOCK(ht6560b_lock);
 247
 248/*
 249 *  Enable/Disable so called prefetch mode
 250 */
 251static void ht_set_prefetch(ide_drive_t *drive, u8 state)
 252{
 253        unsigned long flags, config;
 254        int t = HT_PREFETCH_MODE << 8;
 255
 256        spin_lock_irqsave(&ht6560b_lock, flags);
 257
 258        config = (unsigned long)ide_get_drivedata(drive);
 259
 260        /*
 261         *  Prefetch mode and unmask irq seems to conflict
 262         */
 263        if (state) {
 264                config |= t;   /* enable prefetch mode */
 265                drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
 266                drive->dev_flags &= ~IDE_DFLAG_UNMASK;
 267        } else {
 268                config &= ~t;  /* disable prefetch mode */
 269                drive->dev_flags &= ~IDE_DFLAG_NO_UNMASK;
 270        }
 271
 272        ide_set_drivedata(drive, (void *)config);
 273
 274        spin_unlock_irqrestore(&ht6560b_lock, flags);
 275
 276#ifdef DEBUG
 277        printk("ht6560b: drive %s prefetch mode %sabled\n", drive->name, (state ? "en" : "dis"));
 278#endif
 279}
 280
 281static void ht6560b_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 282{
 283        unsigned long flags, config;
 284        const u8 pio = drive->pio_mode - XFER_PIO_0;
 285        u8 timing;
 286        
 287        switch (pio) {
 288        case 8:         /* set prefetch off */
 289        case 9:         /* set prefetch on */
 290                ht_set_prefetch(drive, pio & 1);
 291                return;
 292        }
 293
 294        timing = ht_pio2timings(drive, pio);
 295
 296        spin_lock_irqsave(&ht6560b_lock, flags);
 297        config = (unsigned long)ide_get_drivedata(drive);
 298        config &= 0xff00;
 299        config |= timing;
 300        ide_set_drivedata(drive, (void *)config);
 301        spin_unlock_irqrestore(&ht6560b_lock, flags);
 302
 303#ifdef DEBUG
 304        printk("ht6560b: drive %s tuned to pio mode %#x timing=%#x\n", drive->name, pio, timing);
 305#endif
 306}
 307
 308static void __init ht6560b_init_dev(ide_drive_t *drive)
 309{
 310        ide_hwif_t *hwif = drive->hwif;
 311        /* Setting default configurations for drives. */
 312        int t = (HT_CONFIG_DEFAULT << 8) | HT_TIMING_DEFAULT;
 313
 314        if (hwif->channel)
 315                t |= (HT_SECONDARY_IF << 8);
 316
 317        ide_set_drivedata(drive, (void *)t);
 318}
 319
 320static bool probe_ht6560b;
 321
 322module_param_named(probe, probe_ht6560b, bool, 0);
 323MODULE_PARM_DESC(probe, "probe for HT6560B chipset");
 324
 325static const struct ide_tp_ops ht6560b_tp_ops = {
 326        .exec_command           = ide_exec_command,
 327        .read_status            = ide_read_status,
 328        .read_altstatus         = ide_read_altstatus,
 329        .write_devctl           = ide_write_devctl,
 330
 331        .dev_select             = ht6560b_dev_select,
 332        .tf_load                = ide_tf_load,
 333        .tf_read                = ide_tf_read,
 334
 335        .input_data             = ide_input_data,
 336        .output_data            = ide_output_data,
 337};
 338
 339static const struct ide_port_ops ht6560b_port_ops = {
 340        .init_dev               = ht6560b_init_dev,
 341        .set_pio_mode           = ht6560b_set_pio_mode,
 342};
 343
 344static const struct ide_port_info ht6560b_port_info __initdata = {
 345        .name                   = DRV_NAME,
 346        .chipset                = ide_ht6560b,
 347        .tp_ops                 = &ht6560b_tp_ops,
 348        .port_ops               = &ht6560b_port_ops,
 349        .host_flags             = IDE_HFLAG_SERIALIZE | /* is this needed? */
 350                                  IDE_HFLAG_NO_DMA |
 351                                  IDE_HFLAG_ABUSE_PREFETCH,
 352        .pio_mask               = ATA_PIO4,
 353};
 354
 355static int __init ht6560b_init(void)
 356{
 357        if (probe_ht6560b == 0)
 358                return -ENODEV;
 359
 360        if (!request_region(HT_CONFIG_PORT, 1, DRV_NAME)) {
 361                printk(KERN_NOTICE "%s: HT_CONFIG_PORT not found\n",
 362                        __func__);
 363                return -ENODEV;
 364        }
 365
 366        if (!try_to_init_ht6560b()) {
 367                printk(KERN_NOTICE "%s: HBA not found\n", __func__);
 368                goto release_region;
 369        }
 370
 371        return ide_legacy_device_add(&ht6560b_port_info, 0);
 372
 373release_region:
 374        release_region(HT_CONFIG_PORT, 1);
 375        return -ENODEV;
 376}
 377
 378module_init(ht6560b_init);
 379
 380MODULE_AUTHOR("See Local File");
 381MODULE_DESCRIPTION("HT-6560B EIDE-controller support");
 382MODULE_LICENSE("GPL");
 383
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