drivers/ide/dtc2278.c

   1 /*
   2  *  linux/drivers/ide/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/types.h>
  10 #include <linux/kernel.h>
  11 #include <linux/delay.h>
  12 #include <linux/timer.h>
  13 #include <linux/mm.h>
  14 #include <linux/ioport.h>
  15 #include <linux/blkdev.h>
  16 #include <linux/hdreg.h>
  17 #include <linux/ide.h>
  18 #include <linux/init.h>
  19
  20 #include <asm/io.h>
  21
  22 #include "ide_modes.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, byte pio)
  74 {
  75         unsigned long flags;
  76
  77         pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
  78
  79         if (pio >= 3) {
  80                 save_flags(flags);      /* all CPUs */
  81                 cli();                  /* all CPUs */
  82                 /*
  83                  * This enables PIO mode4 (3?) on the first interface
  84                  */
  85                 sub22(1,0xc3);
  86                 sub22(0,0xa0);
  87                 restore_flags(flags);   /* all CPUs */
  88         } else {
  89                 /* we don't know how to set it back again.. */
  90         }
  91
  92         /*
  93          * 32bit I/O has to be enabled for *both* drives at the same time.
  94          */
  95         drive->io_32bit = 1;
  96         HWIF(drive)->drives[!drive->select.b.unit].io_32bit = 1;
  97 }
  98
  99 void __init init_dtc2278 (void)
 100 {
 101         unsigned long flags;
 102
 103         __save_flags(flags);    /* local CPU only */
 104         __cli();                /* local CPU only */
 105         /*
 106          * This enables the second interface
 107          */
 108         outb_p(4,0xb0);
 109         inb(0x3f6);
 110         outb_p(0x20,0xb4);
 111         inb(0x3f6);
 112 #ifdef ALWAYS_SET_DTC2278_PIO_MODE
 113         /*
 114          * This enables PIO mode4 (3?) on the first interface
 115          * and may solve start-up problems for some people.
 116          */
 117         sub22(1,0xc3);
 118         sub22(0,0xa0);
 119 #endif
 120         __restore_flags(flags); /* local CPU only */
 121
 122         ide_hwifs[0].serialized = 1;
 123         ide_hwifs[1].serialized = 1;
 124         ide_hwifs[0].chipset = ide_dtc2278;
 125         ide_hwifs[1].chipset = ide_dtc2278;
 126         ide_hwifs[0].tuneproc = &tune_dtc2278;
 127         ide_hwifs[0].drives[0].no_unmask = 1;
 128         ide_hwifs[0].drives[1].no_unmask = 1;
 129         ide_hwifs[1].drives[0].no_unmask = 1;
 130         ide_hwifs[1].drives[1].no_unmask = 1;
 131         ide_hwifs[0].mate = &ide_hwifs[1];
 132         ide_hwifs[1].mate = &ide_hwifs[0];
 133         ide_hwifs[1].channel = 1;
 134 }