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 DRV_NAME        "ht6560b"
  39 #define HT6560B_VERSION "v0.08"
  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 Select register 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         ide_hwif_t *hwif = drive->hwif;
 132         unsigned long flags;
 133         static u8 current_select = 0;
 134         static u8 current_timing = 0;
 135         u8 select, timing;
 136
 137         local_irq_save(flags);
 138
 139         select = HT_CONFIG(drive);
 140         timing = HT_TIMING(drive);
 141
 142         /*
 143          * Need to enforce prefetch sometimes because otherwise
 144          * it'll hang (hard).
 145          */
 146         if (drive->media != ide_disk || !drive->present)
 147                 select |= HT_PREFETCH_MODE;
 148
 149         if (select != current_select || timing != current_timing) {
 150                 current_select = select;
 151                 current_timing = timing;
 152                 (void)inb(HT_CONFIG_PORT);
 153                 (void)inb(HT_CONFIG_PORT);
 154                 (void)inb(HT_CONFIG_PORT);
 155                 (void)inb(HT_CONFIG_PORT);
 156                 outb(select, HT_CONFIG_PORT);
 157                 /*
 158                  * Set timing for this drive:
 159                  */
 160                 outb(timing, hwif->io_ports.device_addr);
 161                 (void)inb(hwif->io_ports.status_addr);
 162 #ifdef DEBUG
 163                 printk("ht6560b: %s: select=%#x timing=%#x\n",
 164                         drive->name, select, timing);
 165 #endif
 166         }
 167         local_irq_restore(flags);
 168 }
 169
 170 /*
 171  * Autodetection and initialization of ht6560b
 172  */
 173 static int __init try_to_init_ht6560b(void)
 174 {
 175         u8 orig_value;
 176         int i;
 177
 178         /* Autodetect ht6560b */
 179         if ((orig_value = inb(HT_CONFIG_PORT)) == 0xff)
 180                 return 0;
 181
 182         for (i=3;i>0;i--) {
 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         outb(0x00, HT_CONFIG_PORT);
 190         if ((~inb(HT_CONFIG_PORT))& 0x3f) {
 191                 outb(orig_value, HT_CONFIG_PORT);
 192                 return 0;
 193         }
 194         /*
 195          * Ht6560b autodetected
 196          */
 197         outb(HT_CONFIG_DEFAULT, HT_CONFIG_PORT);
 198         outb(HT_TIMING_DEFAULT, 0x1f6); /* Select register */
 199         (void)inb(0x1f7);               /* Status register */
 200
 201         printk("ht6560b " HT6560B_VERSION
 202                ": chipset detected and initialized"
 203 #ifdef DEBUG
 204                " with debug enabled"
 205 #endif
 206                "\n"
 207                 );
 208         return 1;
 209 }
 210
 211 static u8 ht_pio2timings(ide_drive_t *drive, const u8 pio)
 212 {
 213         int active_time, recovery_time;
 214         int active_cycles, recovery_cycles;
 215         int bus_speed = ide_vlb_clk ? ide_vlb_clk : system_bus_clock();
 216
 217         if (pio) {
 218                 unsigned int cycle_time;
 219
 220                 cycle_time = ide_pio_cycle_time(drive, pio);
 221
 222                 /*
 223                  *  Just like opti621.c we try to calculate the
 224                  *  actual cycle time for recovery and activity
 225                  *  according system bus speed.
 226                  */
 227                 active_time = ide_pio_timings[pio].active_time;
 228                 recovery_time = cycle_time
 229                         - active_time
 230                         - ide_pio_timings[pio].setup_time;
 231                 /*
 232                  *  Cycle times should be Vesa bus cycles
 233                  */
 234                 active_cycles   = (active_time   * bus_speed + 999) / 1000;
 235                 recovery_cycles = (recovery_time * bus_speed + 999) / 1000;
 236                 /*
 237                  *  Upper and lower limits
 238                  */
 239                 if (active_cycles   < 2)  active_cycles   = 2;
 240                 if (recovery_cycles < 2)  recovery_cycles = 2;
 241                 if (active_cycles   > 15) active_cycles   = 15;
 242                 if (recovery_cycles > 15) recovery_cycles = 0;  /* 0==16 */
 243
 244 #ifdef DEBUG
 245                 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);
 246 #endif
 247
 248                 return (u8)((recovery_cycles << 4) | active_cycles);
 249         } else {
 250
 251 #ifdef DEBUG
 252                 printk("ht6560b: drive %s setting pio=0\n", drive->name);
 253 #endif
 254
 255                 return HT_TIMING_DEFAULT;    /* default setting */
 256         }
 257 }
 258
 259 static DEFINE_SPINLOCK(ht6560b_lock);
 260
 261 /*
 262  *  Enable/Disable so called prefetch mode
 263  */
 264 static void ht_set_prefetch(ide_drive_t *drive, u8 state)
 265 {
 266         unsigned long flags;
 267         int t = HT_PREFETCH_MODE << 8;
 268
 269         spin_lock_irqsave(&ht6560b_lock, flags);
 270
 271         /*
 272          *  Prefetch mode and unmask irq seems to conflict
 273          */
 274         if (state) {
 275                 drive->drive_data |= t;   /* enable prefetch mode */
 276                 drive->no_unmask = 1;
 277                 drive->unmask = 0;
 278         } else {
 279                 drive->drive_data &= ~t;  /* disable prefetch mode */
 280                 drive->no_unmask = 0;
 281         }
 282
 283         spin_unlock_irqrestore(&ht6560b_lock, flags);
 284
 285 #ifdef DEBUG
 286         printk("ht6560b: drive %s prefetch mode %sabled\n", drive->name, (state ? "en" : "dis"));
 287 #endif
 288 }
 289
 290 static void ht6560b_set_pio_mode(ide_drive_t *drive, const u8 pio)
 291 {
 292         unsigned long flags;
 293         u8 timing;
 294
 295         switch (pio) {
 296         case 8:         /* set prefetch off */
 297         case 9:         /* set prefetch on */
 298                 ht_set_prefetch(drive, pio & 1);
 299                 return;
 300         }
 301
 302         timing = ht_pio2timings(drive, pio);
 303
 304         spin_lock_irqsave(&ht6560b_lock, flags);
 305         drive->drive_data &= 0xff00;
 306         drive->drive_data |= timing;
 307         spin_unlock_irqrestore(&ht6560b_lock, flags);
 308
 309 #ifdef DEBUG
 310         printk("ht6560b: drive %s tuned to pio mode %#x timing=%#x\n", drive->name, pio, timing);
 311 #endif
 312 }
 313
 314 static void __init ht6560b_port_init_devs(ide_hwif_t *hwif)
 315 {
 316         /* Setting default configurations for drives. */
 317         int t = (HT_CONFIG_DEFAULT << 8) | HT_TIMING_DEFAULT;
 318
 319         if (hwif->channel)
 320                 t |= (HT_SECONDARY_IF << 8);
 321
 322         hwif->drives[0].drive_data = t;
 323         hwif->drives[1].drive_data = t;
 324 }
 325
 326 static int probe_ht6560b;
 327
 328 module_param_named(probe, probe_ht6560b, bool, 0);
 329 MODULE_PARM_DESC(probe, "probe for HT6560B chipset");
 330
 331 static const struct ide_port_ops ht6560b_port_ops = {
 332         .port_init_devs         = ht6560b_port_init_devs,
 333         .set_pio_mode           = ht6560b_set_pio_mode,
 334         .selectproc             = ht6560b_selectproc,
 335 };
 336
 337 static const struct ide_port_info ht6560b_port_info __initdata = {
 338         .name                   = DRV_NAME,
 339         .chipset                = ide_ht6560b,
 340         .port_ops               = &ht6560b_port_ops,
 341         .host_flags             = IDE_HFLAG_SERIALIZE | /* is this needed? */
 342                                   IDE_HFLAG_NO_DMA |
 343                                   IDE_HFLAG_ABUSE_PREFETCH,
 344         .pio_mask               = ATA_PIO4,
 345 };
 346
 347 static int __init ht6560b_init(void)
 348 {
 349         if (probe_ht6560b == 0)
 350                 return -ENODEV;
 351
 352         if (!request_region(HT_CONFIG_PORT, 1, DRV_NAME)) {
 353                 printk(KERN_NOTICE "%s: HT_CONFIG_PORT not found\n",
 354                         __func__);
 355                 return -ENODEV;
 356         }
 357
 358         if (!try_to_init_ht6560b()) {
 359                 printk(KERN_NOTICE "%s: HBA not found\n", __func__);
 360                 goto release_region;
 361         }
 362
 363         return ide_legacy_device_add(&ht6560b_port_info, 0);
 364
 365 release_region:
 366         release_region(HT_CONFIG_PORT, 1);
 367         return -ENODEV;
 368 }
 369
 370 module_init(ht6560b_init);
 371
 372 MODULE_AUTHOR("See Local File");
 373 MODULE_DESCRIPTION("HT-6560B EIDE-controller support");
 374 MODULE_LICENSE("GPL");