drivers/ide/legacy/umc8672.c

   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
  64 static u8 current_speeds[4] = {UMC_DRIVE0, UMC_DRIVE1, UMC_DRIVE2, UMC_DRIVE3};
  65 static 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      */
  68 static 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
  73 static void out_umc (char port,char wert)
  74 {
  75         outb_p(port,0x108);
  76         outb_p(wert,0x109);
  77 }
  78
  79 static inline u8 in_umc (char port)
  80 {
  81         outb_p(port,0x108);
  82         return inb_p(0x109);
  83 }
  84
  85 static 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
 108 static void tune_umc (ide_drive_t *drive, u8 pio)
 109 {
 110         unsigned long flags;
 111         ide_hwgroup_t *hwgroup = ide_hwifs[HWIF(drive)->index^1].hwgroup;
 112
 113         pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
 114         printk("%s: setting umc8672 to PIO mode%d (speed %d)\n",
 115                 drive->name, pio, pio_to_umc[pio]);
 116         spin_lock_irqsave(&ide_lock, flags);
 117         if (hwgroup && hwgroup->handler != NULL) {
 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         spin_unlock_irqrestore(&ide_lock, flags);
 124 }
 125
 126 static int __init umc8672_probe(void)
 127 {
 128         unsigned long flags;
 129         ide_hwif_t *hwif, *mate;
 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->tuneproc = &tune_umc;
 153         hwif->mate = mate;
 154
 155         mate->chipset = ide_umc8672;
 156         mate->tuneproc = &tune_umc;
 157         mate->mate = hwif;
 158         mate->channel = 1;
 159
 160         probe_hwif_init(hwif);
 161         probe_hwif_init(mate);
 162
 163         create_proc_ide_interfaces();
 164
 165         return 0;
 166 }
 167
 168 /* Can be called directly from ide.c. */
 169 int __init umc8672_init(void)
 170 {
 171         if (umc8672_probe())
 172                 return -ENODEV;
 173         return 0;
 174 }
 175
 176 #ifdef MODULE
 177 module_init(umc8672_init);
 178 #endif
 179
 180 MODULE_AUTHOR("Wolfram Podien");
 181 MODULE_DESCRIPTION("Support for UMC 8672 IDE chipset");
 182 MODULE_LICENSE("GPL");