drivers/ide/ht6560b.c

   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
  47 static 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  */
  97 static 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  */
 114 static 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  */
 161 static 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
 199 static 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
 246 static DEFINE_SPINLOCK(ht6560b_lock);
 247
 248 /*
 249  *  Enable/Disable so called prefetch mode
 250  */
 251 static 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
 281 static 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
 308 static 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
 320 static int probe_ht6560b;
 321
 322 module_param_named(probe, probe_ht6560b, bool, 0);
 323 MODULE_PARM_DESC(probe, "probe for HT6560B chipset");
 324
 325 static 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
 339 static const struct ide_port_ops ht6560b_port_ops = {
 340         .init_dev               = ht6560b_init_dev,
 341         .set_pio_mode           = ht6560b_set_pio_mode,
 342 };
 343
 344 static 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
 355 static 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
 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");