drivers/ide/legacy/dtc2278.c

   1 /*
   2  *  linux/drivers/ide/legacy/dtc2278.c          Version 0.02    Feb 10, 1996
   3  *
   4  *  Copyright (C) 1996  Linus Torvalds & author (see below)
   5  */
   6
   7 #undef REALLY_SLOW_IO           /* most systems can safely undef this */
   8
   9 #include <linux/module.h>
  10 #include <linux/types.h>
  11 #include <linux/kernel.h>
  12 #include <linux/delay.h>
  13 #include <linux/timer.h>
  14 #include <linux/mm.h>
  15 #include <linux/ioport.h>
  16 #include <linux/blkdev.h>
  17 #include <linux/hdreg.h>
  18 #include <linux/ide.h>
  19 #include <linux/init.h>
  20
  21 #include <asm/io.h>
  22
  23 /*
  24  * Changing this #undef to #define may solve start up problems in some systems.
  25  */
  26 #undef ALWAYS_SET_DTC2278_PIO_MODE
  27
  28 /*
  29  * From: andy@cercle.cts.com (Dyan Wile)
  30  *
  31  * Below is a patch for DTC-2278 - alike software-programmable controllers
  32  * The code enables the secondary IDE controller and the PIO4 (3?) timings on
  33  * the primary (EIDE). You may probably have to enable the 32-bit support to
  34  * get the full speed. You better get the disk interrupts disabled ( hdparm -u0
  35  * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my
  36  * filesystem  corrupted with -u1, but under heavy disk load only :-)
  37  *
  38  * This card is now forced to use the "serialize" feature,
  39  * and irq-unmasking is disallowed.  If io_32bit is enabled,
  40  * it must be done for BOTH drives on each interface.
  41  *
  42  * This code was written for the DTC2278E, but might work with any of these:
  43  *
  44  * DTC2278S has only a single IDE interface.
  45  * DTC2278D has two IDE interfaces and is otherwise identical to the S version.
  46  * DTC2278E also has serial ports and a printer port
  47  * DTC2278EB: has onboard BIOS, and "works like a charm" -- Kent Bradford <kent@theory.caltech.edu>
  48  *
  49  * There may be a fourth controller type. The S and D versions use the
  50  * Winbond chip, and I think the E version does also.
  51  *
  52  */
  53
  54 static void sub22 (char b, char c)
  55 {
  56         int i;
  57
  58         for(i = 0; i < 3; ++i) {
  59                 inb(0x3f6);
  60                 outb_p(b,0xb0);
  61                 inb(0x3f6);
  62                 outb_p(c,0xb4);
  63                 inb(0x3f6);
  64                 if(inb(0xb4) == c) {
  65                         outb_p(7,0xb0);
  66                         inb(0x3f6);
  67                         return; /* success */
  68                 }
  69         }
  70 }
  71
  72 static void tune_dtc2278 (ide_drive_t *drive, u8 pio)
  73 {
  74         unsigned long flags;
  75
  76         pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
  77
  78         if (pio >= 3) {
  79                 spin_lock_irqsave(&ide_lock, flags);
  80                 /*
  81                  * This enables PIO mode4 (3?) on the first interface
  82                  */
  83                 sub22(1,0xc3);
  84                 sub22(0,0xa0);
  85                 spin_unlock_irqrestore(&ide_lock, flags);
  86         } else {
  87                 /* we don't know how to set it back again.. */
  88         }
  89
  90         /*
  91          * 32bit I/O has to be enabled for *both* drives at the same time.
  92          */
  93         drive->io_32bit = 1;
  94         HWIF(drive)->drives[!drive->select.b.unit].io_32bit = 1;
  95 }
  96
  97 static int __init probe_dtc2278(void)
  98 {
  99         unsigned long flags;
 100         ide_hwif_t *hwif, *mate;
 101
 102         hwif = &ide_hwifs[0];
 103         mate = &ide_hwifs[1];
 104
 105         if (hwif->chipset != ide_unknown || mate->chipset != ide_unknown)
 106                 return 1;
 107
 108         local_irq_save(flags);
 109         /*
 110          * This enables the second interface
 111          */
 112         outb_p(4,0xb0);
 113         inb(0x3f6);
 114         outb_p(0x20,0xb4);
 115         inb(0x3f6);
 116 #ifdef ALWAYS_SET_DTC2278_PIO_MODE
 117         /*
 118          * This enables PIO mode4 (3?) on the first interface
 119          * and may solve start-up problems for some people.
 120          */
 121         sub22(1,0xc3);
 122         sub22(0,0xa0);
 123 #endif
 124         local_irq_restore(flags);
 125
 126         hwif->serialized = 1;
 127         hwif->chipset = ide_dtc2278;
 128         hwif->tuneproc = &tune_dtc2278;
 129         hwif->drives[0].no_unmask = 1;
 130         hwif->drives[1].no_unmask = 1;
 131         hwif->mate = mate;
 132
 133         mate->serialized = 1;
 134         mate->chipset = ide_dtc2278;
 135         mate->drives[0].no_unmask = 1;
 136         mate->drives[1].no_unmask = 1;
 137         mate->mate = hwif;
 138         mate->channel = 1;
 139
 140         probe_hwif_init(hwif);
 141         probe_hwif_init(mate);
 142
 143         create_proc_ide_interfaces();
 144
 145         return 0;
 146 }
 147
 148 /* Can be called directly from ide.c. */
 149 int __init dtc2278_init(void)
 150 {
 151         if (probe_dtc2278()) {
 152                 printk(KERN_ERR "dtc2278: ide interfaces already in use!\n");
 153                 return -EBUSY;
 154         }
 155         return 0;
 156 }
 157
 158 #ifdef MODULE
 159 module_init(dtc2278_init);
 160 #endif
 161
 162 MODULE_AUTHOR("See Local File");
 163 MODULE_DESCRIPTION("support of DTC-2278 VLB IDE chipsets");
 164 MODULE_LICENSE("GPL");