linux/drivers/ide/legacy/umc8672.c
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   1/*
   2 *  linux/drivers/ide/legacy/umc8672.c          Version 0.05    Jul 31, 1996
   3 *
   4 *  Copyright (C) 1995-1996  Linus Torvalds & author (see below)
   5 */
   6
   7/*
   8 *  Principal Author/Maintainer:  PODIEN@hml2.atlas.de (Wolfram Podien)
   9 *
  10 *  This file provides support for the advanced features
  11 *  of the UMC 8672 IDE interface.
  12 *
  13 *  Version 0.01        Initial version, hacked out of ide.c,
  14 *                      and #include'd rather than compiled separately.
  15 *                      This will get cleaned up in a subsequent release.
  16 *
  17 *  Version 0.02        now configs/compiles separate from ide.c  -ml
  18 *  Version 0.03        enhanced auto-tune, fix display bug
  19 *  Version 0.05        replace sti() with restore_flags()  -ml
  20 *                      add detection of possible race condition  -ml
  21 */
  22
  23/*
  24 * VLB Controller Support from 
  25 * Wolfram Podien
  26 * Rohoefe 3
  27 * D28832 Achim
  28 * Germany
  29 *
  30 * To enable UMC8672 support there must a lilo line like
  31 * append="ide0=umc8672"...
  32 * To set the speed according to the abilities of the hardware there must be a
  33 * line like
  34 * #define UMC_DRIVE0 11
  35 * in the beginning of the driver, which sets the speed of drive 0 to 11 (there
  36 * are some lines present). 0 - 11 are allowed speed values. These values are
  37 * the results from the DOS speed test program supplied from UMC. 11 is the 
  38 * highest speed (about PIO mode 3)
  39 */
  40#define REALLY_SLOW_IO          /* some systems can safely undef this */
  41
  42#include <linux/module.h>
  43#include <linux/types.h>
  44#include <linux/kernel.h>
  45#include <linux/delay.h>
  46#include <linux/timer.h>
  47#include <linux/mm.h>
  48#include <linux/ioport.h>
  49#include <linux/blkdev.h>
  50#include <linux/hdreg.h>
  51#include <linux/ide.h>
  52#include <linux/init.h>
  53
  54#include <asm/io.h>
  55
  56/*
  57 * Default speeds.  These can be changed with "auto-tune" and/or hdparm.
  58 */
  59#define UMC_DRIVE0      1              /* DOS measured drive speeds */
  60#define UMC_DRIVE1      1              /* 0 to 11 allowed */
  61#define UMC_DRIVE2      1              /* 11 = Fastest Speed */
  62#define UMC_DRIVE3      1              /* In case of crash reduce speed */
  63
  64static u8 current_speeds[4] = {UMC_DRIVE0, UMC_DRIVE1, UMC_DRIVE2, UMC_DRIVE3};
  65static const u8 pio_to_umc [5] = {0,3,7,10,11}; /* rough guesses */
  66
  67/*       0    1    2    3    4    5    6    7    8    9    10   11      */
  68static const u8 speedtab [3][12] = {
  69        {0xf, 0xb, 0x2, 0x2, 0x2, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1 },
  70        {0x3, 0x2, 0x2, 0x2, 0x2, 0x2, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1 },
  71        {0xff,0xcb,0xc0,0x58,0x36,0x33,0x23,0x22,0x21,0x11,0x10,0x0}};
  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        }
  97        out_umc (0xdc,tmp);
  98        for (i = 0;i < 4; i++) {
  99                out_umc (0xd0+i,speedtab[2][speeds[i]]);
 100                out_umc (0xd8+i,speedtab[2][speeds[i]]);
 101        }
 102        outb_p(0xa5,0x108); /* disable umc */
 103
 104        printk ("umc8672: drive speeds [0 to 11]: %d %d %d %d\n",
 105                speeds[0], speeds[1], speeds[2], speeds[3]);
 106}
 107
 108static void umc_set_pio_mode(ide_drive_t *drive, const u8 pio)
 109{
 110        unsigned long flags;
 111        ide_hwgroup_t *hwgroup = ide_hwifs[HWIF(drive)->index^1].hwgroup;
 112
 113        printk("%s: setting umc8672 to PIO mode%d (speed %d)\n",
 114                drive->name, pio, pio_to_umc[pio]);
 115        spin_lock_irqsave(&ide_lock, flags);
 116        if (hwgroup && hwgroup->handler != NULL) {
 117                printk(KERN_ERR "umc8672: other interface is busy: exiting tune_umc()\n");
 118        } else {
 119                current_speeds[drive->name[2] - 'a'] = pio_to_umc[pio];
 120                umc_set_speeds (current_speeds);
 121        }
 122        spin_unlock_irqrestore(&ide_lock, flags);
 123}
 124
 125static int __init umc8672_probe(void)
 126{
 127        ide_hwif_t *hwif, *mate;
 128        unsigned long flags;
 129        static u8 idx[4] = { 0, 1, 0xff, 0xff };
 130
 131        if (!request_region(0x108, 2, "umc8672")) {
 132                printk(KERN_ERR "umc8672: ports 0x108-0x109 already in use.\n");
 133                return 1;
 134        }
 135        local_irq_save(flags);
 136        outb_p(0x5A,0x108); /* enable umc */
 137        if (in_umc (0xd5) != 0xa0) {
 138                local_irq_restore(flags);
 139                printk(KERN_ERR "umc8672: not found\n");
 140                release_region(0x108, 2);
 141                return 1;  
 142        }
 143        outb_p(0xa5,0x108); /* disable umc */
 144
 145        umc_set_speeds (current_speeds);
 146        local_irq_restore(flags);
 147
 148        hwif = &ide_hwifs[0];
 149        mate = &ide_hwifs[1];
 150
 151        hwif->chipset = ide_umc8672;
 152        hwif->pio_mask = ATA_PIO4;
 153        hwif->set_pio_mode = &umc_set_pio_mode;
 154        hwif->mate = mate;
 155
 156        mate->chipset = ide_umc8672;
 157        mate->pio_mask = ATA_PIO4;
 158        mate->set_pio_mode = &umc_set_pio_mode;
 159        mate->mate = hwif;
 160        mate->channel = 1;
 161
 162        ide_device_add(idx);
 163
 164        return 0;
 165}
 166
 167int probe_umc8672 = 0;
 168
 169module_param_named(probe, probe_umc8672, bool, 0);
 170MODULE_PARM_DESC(probe, "probe for UMC8672 chipset");
 171
 172/* Can be called directly from ide.c. */
 173int __init umc8672_init(void)
 174{
 175        if (probe_umc8672 == 0)
 176                goto out;
 177
 178        if (umc8672_probe() == 0)
 179                return 0;;
 180out:
 181        return -ENODEV;;
 182}
 183
 184#ifdef MODULE
 185module_init(umc8672_init);
 186#endif
 187
 188MODULE_AUTHOR("Wolfram Podien");
 189MODULE_DESCRIPTION("Support for UMC 8672 IDE chipset");
 190MODULE_LICENSE("GPL");
 191
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