drivers/ide/legacy/umc8672.c

   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/hdreg.h>
  49 #include <linux/ide.h>
  50 #include <linux/init.h>
  51
  52 #include <asm/io.h>
  53
  54 /*
  55  * Default speeds.  These can be changed with "auto-tune" and/or hdparm.
  56  */
  57 #define UMC_DRIVE0      1              /* DOS measured drive speeds */
  58 #define UMC_DRIVE1      1              /* 0 to 11 allowed */
  59 #define UMC_DRIVE2      1              /* 11 = Fastest Speed */
  60 #define UMC_DRIVE3      1              /* In case of crash reduce speed */
  61
  62 static u8 current_speeds[4] = {UMC_DRIVE0, UMC_DRIVE1, UMC_DRIVE2, UMC_DRIVE3};
  63 static const u8 pio_to_umc [5] = {0,3,7,10,11}; /* rough guesses */
  64
  65 /*       0    1    2    3    4    5    6    7    8    9    10   11      */
  66 static const u8 speedtab [3][12] = {
  67         {0xf, 0xb, 0x2, 0x2, 0x2, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1 },
  68         {0x3, 0x2, 0x2, 0x2, 0x2, 0x2, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1 },
  69         {0xff,0xcb,0xc0,0x58,0x36,0x33,0x23,0x22,0x21,0x11,0x10,0x0}};
  70
  71 static void out_umc (char port,char wert)
  72 {
  73         outb_p(port,0x108);
  74         outb_p(wert,0x109);
  75 }
  76
  77 static inline u8 in_umc (char port)
  78 {
  79         outb_p(port,0x108);
  80         return inb_p(0x109);
  81 }
  82
  83 static void umc_set_speeds (u8 speeds[])
  84 {
  85         int i, tmp;
  86
  87         outb_p(0x5A,0x108); /* enable umc */
  88
  89         out_umc (0xd7,(speedtab[0][speeds[2]] | (speedtab[0][speeds[3]]<<4)));
  90         out_umc (0xd6,(speedtab[0][speeds[0]] | (speedtab[0][speeds[1]]<<4)));
  91         tmp = 0;
  92         for (i = 3; i >= 0; i--) {
  93                 tmp = (tmp << 2) | speedtab[1][speeds[i]];
  94         }
  95         out_umc (0xdc,tmp);
  96         for (i = 0;i < 4; i++) {
  97                 out_umc (0xd0+i,speedtab[2][speeds[i]]);
  98                 out_umc (0xd8+i,speedtab[2][speeds[i]]);
  99         }
 100         outb_p(0xa5,0x108); /* disable umc */
 101
 102         printk ("umc8672: drive speeds [0 to 11]: %d %d %d %d\n",
 103                 speeds[0], speeds[1], speeds[2], speeds[3]);
 104 }
 105
 106 static void umc_set_pio_mode(ide_drive_t *drive, const u8 pio)
 107 {
 108         unsigned long flags;
 109         ide_hwgroup_t *hwgroup = ide_hwifs[HWIF(drive)->index^1].hwgroup;
 110
 111         printk("%s: setting umc8672 to PIO mode%d (speed %d)\n",
 112                 drive->name, pio, pio_to_umc[pio]);
 113         spin_lock_irqsave(&ide_lock, flags);
 114         if (hwgroup && hwgroup->handler != NULL) {
 115                 printk(KERN_ERR "umc8672: other interface is busy: exiting tune_umc()\n");
 116         } else {
 117                 current_speeds[drive->name[2] - 'a'] = pio_to_umc[pio];
 118                 umc_set_speeds (current_speeds);
 119         }
 120         spin_unlock_irqrestore(&ide_lock, flags);
 121 }
 122
 123 static const struct ide_port_info umc8672_port_info __initdata = {
 124         .chipset                = ide_umc8672,
 125         .host_flags             = IDE_HFLAG_NO_DMA | IDE_HFLAG_NO_AUTOTUNE,
 126         .pio_mask               = ATA_PIO4,
 127 };
 128
 129 static int __init umc8672_probe(void)
 130 {
 131         unsigned long flags;
 132         static u8 idx[4] = { 0, 1, 0xff, 0xff };
 133
 134         if (!request_region(0x108, 2, "umc8672")) {
 135                 printk(KERN_ERR "umc8672: ports 0x108-0x109 already in use.\n");
 136                 return 1;
 137         }
 138         local_irq_save(flags);
 139         outb_p(0x5A,0x108); /* enable umc */
 140         if (in_umc (0xd5) != 0xa0) {
 141                 local_irq_restore(flags);
 142                 printk(KERN_ERR "umc8672: not found\n");
 143                 release_region(0x108, 2);
 144                 return 1;
 145         }
 146         outb_p(0xa5,0x108); /* disable umc */
 147
 148         umc_set_speeds (current_speeds);
 149         local_irq_restore(flags);
 150
 151         ide_hwifs[0].set_pio_mode = &umc_set_pio_mode;
 152         ide_hwifs[1].set_pio_mode = &umc_set_pio_mode;
 153
 154         ide_device_add(idx, &umc8672_port_info);
 155
 156         return 0;
 157 }
 158
 159 int probe_umc8672 = 0;
 160
 161 module_param_named(probe, probe_umc8672, bool, 0);
 162 MODULE_PARM_DESC(probe, "probe for UMC8672 chipset");
 163
 164 static int __init umc8672_init(void)
 165 {
 166         if (probe_umc8672 == 0)
 167                 goto out;
 168
 169         if (umc8672_probe() == 0)
 170                 return 0;;
 171 out:
 172         return -ENODEV;;
 173 }
 174
 175 module_init(umc8672_init);
 176
 177 MODULE_AUTHOR("Wolfram Podien");
 178 MODULE_DESCRIPTION("Support for UMC 8672 IDE chipset");
 179 MODULE_LICENSE("GPL");