drivers/ide/umc8672.c

   1 /*
   2  *  linux/drivers/ide/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/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 #include "ide_modes.h"
  56
  57 /*
  58  * Default speeds.  These can be changed with "auto-tune" and/or hdparm.
  59  */
  60 #define UMC_DRIVE0      1              /* DOS measured drive speeds */
  61 #define UMC_DRIVE1      1              /* 0 to 11 allowed */
  62 #define UMC_DRIVE2      1              /* 11 = Fastest Speed */
  63 #define UMC_DRIVE3      1              /* In case of crash reduce speed */
  64
  65 static byte current_speeds[4] = {UMC_DRIVE0, UMC_DRIVE1, UMC_DRIVE2, UMC_DRIVE3};
  66 static const byte pio_to_umc [5] = {0,3,7,10,11};       /* rough guesses */
  67
  68 /*       0    1    2    3    4    5    6    7    8    9    10   11      */
  69 static const byte speedtab [3][12] = {
  70         {0xf, 0xb, 0x2, 0x2, 0x2, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1 },
  71         {0x3, 0x2, 0x2, 0x2, 0x2, 0x2, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1 },
  72         {0xff,0xcb,0xc0,0x58,0x36,0x33,0x23,0x22,0x21,0x11,0x10,0x0}};
  73
  74 static void out_umc (char port,char wert)
  75 {
  76         outb_p (port,0x108);
  77         outb_p (wert,0x109);
  78 }
  79
  80 static inline byte in_umc (char port)
  81 {
  82         outb_p (port,0x108);
  83         return inb_p (0x109);
  84 }
  85
  86 static void umc_set_speeds (byte speeds[])
  87 {
  88         int i, tmp;
  89
  90         outb_p (0x5A,0x108); /* enable umc */
  91
  92         out_umc (0xd7,(speedtab[0][speeds[2]] | (speedtab[0][speeds[3]]<<4)));
  93         out_umc (0xd6,(speedtab[0][speeds[0]] | (speedtab[0][speeds[1]]<<4)));
  94         tmp = 0;
  95         for (i = 3; i >= 0; i--)
  96         {
  97                 tmp = (tmp << 2) | speedtab[1][speeds[i]];
  98         }
  99         out_umc (0xdc,tmp);
 100         for (i = 0;i < 4; i++)
 101         {
 102                 out_umc (0xd0+i,speedtab[2][speeds[i]]);
 103                 out_umc (0xd8+i,speedtab[2][speeds[i]]);
 104         }
 105         outb_p (0xa5,0x108); /* disable umc */
 106
 107         printk ("umc8672: drive speeds [0 to 11]: %d %d %d %d\n",
 108                 speeds[0], speeds[1], speeds[2], speeds[3]);
 109 }
 110
 111 static void tune_umc (ide_drive_t *drive, byte pio)
 112 {
 113         unsigned long flags;
 114         ide_hwgroup_t *hwgroup = ide_hwifs[HWIF(drive)->index^1].hwgroup;
 115
 116         pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
 117         printk("%s: setting umc8672 to PIO mode%d (speed %d)\n", drive->name, pio, pio_to_umc[pio]);
 118         save_flags(flags);      /* all CPUs */
 119         cli();                  /* all CPUs */
 120         if (hwgroup && hwgroup->handler != NULL) {
 121                 printk("umc8672: other interface is busy: exiting tune_umc()\n");
 122         } else {
 123                 current_speeds[drive->name[2] - 'a'] = pio_to_umc[pio];
 124                 umc_set_speeds (current_speeds);
 125         }
 126         restore_flags(flags);   /* all CPUs */
 127 }
 128
 129 void __init init_umc8672 (void) /* called from ide.c */
 130 {
 131         unsigned long flags;
 132
 133         __save_flags(flags);    /* local CPU only */
 134         __cli();                /* local CPU only */
 135         if (check_region(0x108, 2)) {
 136                 __restore_flags(flags);
 137                 printk("\numc8672: PORTS 0x108-0x109 ALREADY IN USE\n");
 138                 return;
 139         }
 140         outb_p (0x5A,0x108); /* enable umc */
 141         if (in_umc (0xd5) != 0xa0)
 142         {
 143                 __restore_flags(flags); /* local CPU only */
 144                 printk ("umc8672: not found\n");
 145                 return;
 146         }
 147         outb_p (0xa5,0x108); /* disable umc */
 148
 149         umc_set_speeds (current_speeds);
 150         __restore_flags(flags); /* local CPU only */
 151
 152         request_region(0x108, 2, "umc8672");
 153         ide_hwifs[0].chipset = ide_umc8672;
 154         ide_hwifs[1].chipset = ide_umc8672;
 155         ide_hwifs[0].tuneproc = &tune_umc;
 156         ide_hwifs[1].tuneproc = &tune_umc;
 157         ide_hwifs[0].mate = &ide_hwifs[1];
 158         ide_hwifs[1].mate = &ide_hwifs[0];
 159         ide_hwifs[1].channel = 1;
 160 }