drivers/block/qd6580.c

   1 /*
   2  *  linux/drivers/block/qd6580.c       Version 0.02  Feb 09, 1996
   3  *
   4  *  Copyright (C) 1996  Linus Torvalds & author (see below)
   5  */
   6
   7 /*
   8  * QDI QD6580 EIDE controller fast support by Colten Edwards.
   9  * No net access, but (maybe) can be reached at pje120@cs.usask.ca
  10  */
  11
  12 #undef REALLY_SLOW_IO           /* most systems can safely undef this */
  13
  14 #include <linux/types.h>
  15 #include <linux/kernel.h>
  16 #include <linux/delay.h>
  17 #include <linux/timer.h>
  18 #include <linux/mm.h>
  19 #include <linux/ioport.h>
  20 #include <linux/blkdev.h>
  21 #include <linux/hdreg.h>
  22 #include <linux/ide.h>
  23
  24 #include <asm/io.h>
  25
  26 #include "ide_modes.h"
  27
  28 /*
  29  * Register 0xb3 looks like:
  30  *      0x4f is fast            mode3 ?
  31  *      0x3f is medium          mode2 ?
  32  *      0x2f is slower          mode1 ?
  33  *      0x1f is slower yet      mode0 ?
  34  *      0x0f ???                ???
  35  *
  36  * Don't know whether this sets BOTH drives, or just the first drive.
  37  * Don't know if there is a separate setting for the second drive.
  38  *
  39  * Feel free to patch this if you have one of these beasts
  40  * and can work out the answers!
  41  *
  42  * I/O ports are 0xb0 0xb2 and 0xb3
  43  *
  44  * More research on qd6580 being done by willmore@cig.mot.com (David)
  45  *      -- this is apparently a *dual* IDE interface
  46  */
  47
  48 static void tune_qd6580 (ide_drive_t *drive, byte pio)
  49 {
  50         unsigned long flags;
  51
  52         pio = ide_get_best_pio_mode(drive, pio, 3, NULL);
  53
  54         save_flags(flags);      /* all CPUs */
  55         cli();                  /* all CPUs */
  56         outb_p(0x8d,0xb0);
  57         outb_p(0x0 ,0xb2);
  58         outb_p(((pio+1)<<4)|0x0f,0xb3);
  59         inb(0x3f6);
  60         restore_flags(flags);   /* all CPUs */
  61 }
  62
  63 void init_qd6580 (void)
  64 {
  65         ide_hwifs[0].chipset = ide_qd6580;
  66         ide_hwifs[1].chipset = ide_qd6580;
  67         ide_hwifs[0].tuneproc = &tune_qd6580;
  68         ide_hwifs[0].mate = &ide_hwifs[1];
  69         ide_hwifs[1].mate = &ide_hwifs[0];
  70         ide_hwifs[1].channel = 1;
  71 }