drivers/ide/umc8672.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Copyright (C) 1995-1996  Linus Torvalds & author (see below)
   4  */
   5
   6 /*
   7  *  Principal Author/Maintainer:  PODIEN@hml2.atlas.de (Wolfram Podien)
   8  *
   9  *  This file provides support for the advanced features
  10  *  of the UMC 8672 IDE interface.
  11  *
  12  *  Version 0.01        Initial version, hacked out of ide.c,
  13  *                      and #include'd rather than compiled separately.
  14  *                      This will get cleaned up in a subsequent release.
  15  *
  16  *  Version 0.02        now configs/compiles separate from ide.c  -ml
  17  *  Version 0.03        enhanced auto-tune, fix display bug
  18  *  Version 0.05        replace sti() with restore_flags()  -ml
  19  *                      add detection of possible race condition  -ml
  20  */
  21
  22 /*
  23  * VLB Controller Support from
  24  * Wolfram Podien
  25  * Rohoefe 3
  26  * D28832 Achim
  27  * Germany
  28  *
  29  * To enable UMC8672 support there must a lilo line like
  30  * append="ide0=umc8672"...
  31  * To set the speed according to the abilities of the hardware there must be a
  32  * line like
  33  * #define UMC_DRIVE0 11
  34  * in the beginning of the driver, which sets the speed of drive 0 to 11 (there
  35  * are some lines present). 0 - 11 are allowed speed values. These values are
  36  * the results from the DOS speed test program supplied from UMC. 11 is the
  37  * highest speed (about PIO mode 3)
  38  */
  39 #define REALLY_SLOW_IO          /* some systems can safely undef this */
  40
  41 #include <linux/module.h>
  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/ide.h>
  50 #include <linux/init.h>
  51
  52 #include <asm/io.h>
  53
  54 #define DRV_NAME "umc8672"
  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         {0x0f, 0x0b, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x1},
  70         {0x03, 0x02, 0x02, 0x02, 0x02, 0x02, 0x01, 0x01, 0x01, 0x01, 0x01, 0x1},
  71         {0xff, 0xcb, 0xc0, 0x58, 0x36, 0x33, 0x23, 0x22, 0x21, 0x11, 0x10, 0x0}
  72 };
  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 u8 in_umc(char port)
  81 {
  82         outb_p(port, 0x108);
  83         return inb_p(0x109);
  84 }
  85
  86 static void umc_set_speeds(u8 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                 tmp = (tmp << 2) | speedtab[1][speeds[i]];
  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 umc_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 109 {
 110         ide_hwif_t *mate = hwif->mate;
 111         unsigned long uninitialized_var(flags);
 112         const u8 pio = drive->pio_mode - XFER_PIO_0;
 113
 114         printk("%s: setting umc8672 to PIO mode%d (speed %d)\n",
 115                 drive->name, pio, pio_to_umc[pio]);
 116         if (mate)
 117                 spin_lock_irqsave(&mate->lock, flags);
 118         if (mate && mate->handler) {
 119                 printk(KERN_ERR "umc8672: other interface is busy: exiting tune_umc()\n");
 120         } else {
 121                 current_speeds[drive->name[2] - 'a'] = pio_to_umc[pio];
 122                 umc_set_speeds(current_speeds);
 123         }
 124         if (mate)
 125                 spin_unlock_irqrestore(&mate->lock, flags);
 126 }
 127
 128 static const struct ide_port_ops umc8672_port_ops = {
 129         .set_pio_mode           = umc_set_pio_mode,
 130 };
 131
 132 static const struct ide_port_info umc8672_port_info __initconst = {
 133         .name                   = DRV_NAME,
 134         .chipset                = ide_umc8672,
 135         .port_ops               = &umc8672_port_ops,
 136         .host_flags             = IDE_HFLAG_NO_DMA,
 137         .pio_mask               = ATA_PIO4,
 138 };
 139
 140 static int __init umc8672_probe(void)
 141 {
 142         unsigned long flags;
 143
 144         if (!request_region(0x108, 2, "umc8672")) {
 145                 printk(KERN_ERR "umc8672: ports 0x108-0x109 already in use.\n");
 146                 return 1;
 147         }
 148         local_irq_save(flags);
 149         outb_p(0x5A, 0x108); /* enable umc */
 150         if (in_umc (0xd5) != 0xa0) {
 151                 local_irq_restore(flags);
 152                 printk(KERN_ERR "umc8672: not found\n");
 153                 release_region(0x108, 2);
 154                 return 1;
 155         }
 156         outb_p(0xa5, 0x108); /* disable umc */
 157
 158         umc_set_speeds(current_speeds);
 159         local_irq_restore(flags);
 160
 161         return ide_legacy_device_add(&umc8672_port_info, 0);
 162 }
 163
 164 static bool probe_umc8672;
 165
 166 module_param_named(probe, probe_umc8672, bool, 0);
 167 MODULE_PARM_DESC(probe, "probe for UMC8672 chipset");
 168
 169 static int __init umc8672_init(void)
 170 {
 171         if (probe_umc8672 == 0)
 172                 goto out;
 173
 174         if (umc8672_probe() == 0)
 175                 return 0;
 176 out:
 177         return -ENODEV;
 178 }
 179
 180 module_init(umc8672_init);
 181
 182 MODULE_AUTHOR("Wolfram Podien");
 183 MODULE_DESCRIPTION("Support for UMC 8672 IDE chipset");
 184 MODULE_LICENSE("GPL");