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