linux/drivers/ide/umc8672.c
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   1/*
   2 *  Copyright (C) 1995-1996  Linus Torvalds & author (see below)
   3 */
   4
   5/*
   6 *  Principal Author/Maintainer:  PODIEN@hml2.atlas.de (Wolfram Podien)
   7 *
   8 *  This file provides support for the advanced features
   9 *  of the UMC 8672 IDE interface.
  10 *
  11 *  Version 0.01        Initial version, hacked out of ide.c,
  12 *                      and #include'd rather than compiled separately.
  13 *                      This will get cleaned up in a subsequent release.
  14 *
  15 *  Version 0.02        now configs/compiles separate from ide.c  -ml
  16 *  Version 0.03        enhanced auto-tune, fix display bug
  17 *  Version 0.05        replace sti() with restore_flags()  -ml
  18 *                      add detection of possible race condition  -ml
  19 */
  20
  21/*
  22 * VLB Controller Support from
  23 * Wolfram Podien
  24 * Rohoefe 3
  25 * D28832 Achim
  26 * Germany
  27 *
  28 * To enable UMC8672 support there must a lilo line like
  29 * append="ide0=umc8672"...
  30 * To set the speed according to the abilities of the hardware there must be a
  31 * line like
  32 * #define UMC_DRIVE0 11
  33 * in the beginning of the driver, which sets the speed of drive 0 to 11 (there
  34 * are some lines present). 0 - 11 are allowed speed values. These values are
  35 * the results from the DOS speed test program supplied from UMC. 11 is the
  36 * highest speed (about PIO mode 3)
  37 */
  38#define REALLY_SLOW_IO          /* some systems can safely undef this */
  39
  40#include <linux/module.h>
  41#include <linux/types.h>
  42#include <linux/kernel.h>
  43#include <linux/delay.h>
  44#include <linux/timer.h>
  45#include <linux/mm.h>
  46#include <linux/ioport.h>
  47#include <linux/blkdev.h>
  48#include <linux/ide.h>
  49#include <linux/init.h>
  50
  51#include <asm/io.h>
  52
  53#define DRV_NAME "umc8672"
  54
  55/*
  56 * Default speeds.  These can be changed with "auto-tune" and/or hdparm.
  57 */
  58#define UMC_DRIVE0      1              /* DOS measured drive speeds */
  59#define UMC_DRIVE1      1              /* 0 to 11 allowed */
  60#define UMC_DRIVE2      1              /* 11 = Fastest Speed */
  61#define UMC_DRIVE3      1              /* In case of crash reduce speed */
  62
  63static u8 current_speeds[4] = {UMC_DRIVE0, UMC_DRIVE1, UMC_DRIVE2, UMC_DRIVE3};
  64static const u8 pio_to_umc [5] = {0, 3, 7, 10, 11};     /* rough guesses */
  65
  66/*       0    1    2    3    4    5    6    7    8    9    10   11      */
  67static const u8 speedtab [3][12] = {
  68        {0x0f, 0x0b, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x1},
  69        {0x03, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x1},
  70        {0xff, 0xcb, 0xc0, 0x58, 0x36, 0x33, 0x23, 0x22, 0x21, 0x11, 0x10, 0x0}
  71};
  72
  73static void out_umc(char port, char wert)
  74{
  75        outb_p(port, 0x108);
  76        outb_p(wert, 0x109);
  77}
  78
  79static inline u8 in_umc(char port)
  80{
  81        outb_p(port, 0x108);
  82        return inb_p(0x109);
  83}
  84
  85static void umc_set_speeds(u8 speeds[])
  86{
  87        int i, tmp;
  88
  89        outb_p(0x5A, 0x108); /* enable umc */
  90
  91        out_umc(0xd7, (speedtab[0][speeds[2]] | (speedtab[0][speeds[3]]<<4)));
  92        out_umc(0xd6, (speedtab[0][speeds[0]] | (speedtab[0][speeds[1]]<<4)));
  93        tmp = 0;
  94        for (i = 3; i >= 0; i--)
  95                tmp = (tmp << 2) | speedtab[1][speeds[i]];
  96        out_umc(0xdc, tmp);
  97        for (i = 0; i < 4; i++) {
  98                out_umc(0xd0 + i, speedtab[2][speeds[i]]);
  99                out_umc(0xd8 + i, speedtab[2][speeds[i]]);
 100        }
 101        outb_p(0xa5, 0x108); /* disable umc */
 102
 103        printk("umc8672: drive speeds [0 to 11]: %d %d %d %d\n",
 104                speeds[0], speeds[1], speeds[2], speeds[3]);
 105}
 106
 107static void umc_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 108{
 109        ide_hwif_t *mate = hwif->mate;
 110        unsigned long uninitialized_var(flags);
 111        const u8 pio = drive->pio_mode - XFER_PIO_0;
 112
 113        printk("%s: setting umc8672 to PIO mode%d (speed %d)\n",
 114                drive->name, pio, pio_to_umc[pio]);
 115        if (mate)
 116                spin_lock_irqsave(&mate->lock, flags);
 117        if (mate && mate->handler) {
 118                printk(KERN_ERR "umc8672: other interface is busy: exiting tune_umc()\n");
 119        } else {
 120                current_speeds[drive->name[2] - 'a'] = pio_to_umc[pio];
 121                umc_set_speeds(current_speeds);
 122        }
 123        if (mate)
 124                spin_unlock_irqrestore(&mate->lock, flags);
 125}
 126
 127static const struct ide_port_ops umc8672_port_ops = {
 128        .set_pio_mode           = umc_set_pio_mode,
 129};
 130
 131static const struct ide_port_info umc8672_port_info __initdata = {
 132        .name                   = DRV_NAME,
 133        .chipset                = ide_umc8672,
 134        .port_ops               = &umc8672_port_ops,
 135        .host_flags             = IDE_HFLAG_NO_DMA,
 136        .pio_mask               = ATA_PIO4,
 137};
 138
 139static int __init umc8672_probe(void)
 140{
 141        unsigned long flags;
 142
 143        if (!request_region(0x108, 2, "umc8672")) {
 144                printk(KERN_ERR "umc8672: ports 0x108-0x109 already in use.\n");
 145                return 1;
 146        }
 147        local_irq_save(flags);
 148        outb_p(0x5A, 0x108); /* enable umc */
 149        if (in_umc (0xd5) != 0xa0) {
 150                local_irq_restore(flags);
 151                printk(KERN_ERR "umc8672: not found\n");
 152                release_region(0x108, 2);
 153                return 1;
 154        }
 155        outb_p(0xa5, 0x108); /* disable umc */
 156
 157        umc_set_speeds(current_speeds);
 158        local_irq_restore(flags);
 159
 160        return ide_legacy_device_add(&umc8672_port_info, 0);
 161}
 162
 163static bool probe_umc8672;
 164
 165module_param_named(probe, probe_umc8672, bool, 0);
 166MODULE_PARM_DESC(probe, "probe for UMC8672 chipset");
 167
 168static int __init umc8672_init(void)
 169{
 170        if (probe_umc8672 == 0)
 171                goto out;
 172
 173        if (umc8672_probe() == 0)
 174                return 0;
 175out:
 176        return -ENODEV;
 177}
 178
 179module_init(umc8672_init);
 180
 181MODULE_AUTHOR("Wolfram Podien");
 182MODULE_DESCRIPTION("Support for UMC 8672 IDE chipset");
 183MODULE_LICENSE("GPL");
 184
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