drivers/block/dtc2278.c

/* */
This source file includes following definitions.
sub22
tune_dtc2278
init_dtc2278
   1 /*
   2  *  linux/drivers/block/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 <asm/io.h>
  18 #include "ide.h"
  19 #include "ide_modes.h"
  20 
  21 /*
  22  * Changing this #undef to #define may solve start up problems in some systems.
  23  */
  24 #undef ALWAYS_SET_DTC2278_PIO_MODE
  25 
  26 /*
  27  * From: andy@cercle.cts.com (Dyan Wile)
  28  *
  29  * Below is a patch for DTC-2278 - alike software-programmable controllers
  30  * The code enables the secondary IDE controller and the PIO4 (3?) timings on
  31  * the primary (EIDE). You may probably have to enable the 32-bit support to
  32  * get the full speed. You better get the disk interrupts disabled ( hdparm -u0
  33  * /dev/hd.. ) for the drives connected to the EIDE interface. (I get my
  34  * filesystem  corrupted with -u1, but under heavy disk load only :-)
  35  *
  36  * This chipset is now forced to use the "serialize" feature,
  37  * and irq-unmasking is disallowed.  If io_32bit is enabled,
  38  * it must be done for BOTH drives on each interface.
  39  */
  40 
  41 static void sub22 (char b, char c)
     /*  */
  42 {
  43         int i;
  44 
  45         for(i = 0; i < 3; ++i) {
  46                 inb(0x3f6);
  47                 outb_p(b,0xb0);
  48                 inb(0x3f6);
  49                 outb_p(c,0xb4);
  50                 inb(0x3f6);
  51                 if(inb(0xb4) == c) {
  52                         outb_p(7,0xb0);
  53                         inb(0x3f6);
  54                         return; /* success */
  55                 }
  56         }
  57 }
  58 
  59 static void tune_dtc2278 (ide_drive_t *drive, byte pio)
     /*  */
  60 {
  61         unsigned long flags;
  62 
  63         if (pio == 255)
  64                 pio = ide_get_best_pio_mode(drive);
  65 
  66         if (pio >= 3) {
  67                 save_flags(flags);
  68                 cli();
  69                 /*
  70                  * This enables PIO mode4 (3?) on the first interface
  71                  */
  72                 sub22(1,0xc3);
  73                 sub22(0,0xa0);
  74                 restore_flags(flags);
  75         } else {
  76                 /* we don't know how to set it back again.. */
  77         }
  78 
  79         /*
  80          * 32bit I/O has to be enabled for *both* drives at the same time.
  81          */
  82         drive->io_32bit = 1;
  83         HWIF(drive)->drives[!drive->select.b.unit].io_32bit = 1;
  84 }
  85 
  86 void init_dtc2278 (void)
     /*  */
  87 {
  88         unsigned long flags;
  89 
  90         save_flags(flags);
  91         cli();
  92         /*
  93          * This enables the second interface
  94          */
  95         outb_p(4,0xb0);
  96         inb(0x3f6);
  97         outb_p(0x20,0xb4);
  98         inb(0x3f6);
  99 #ifdef ALWAYS_SET_DTC2278_PIO_MODE
 100         /*
 101          * This enables PIO mode4 (3?) on the first interface
 102          * and may solve start-up problems for some people.
 103          */
 104         sub22(1,0xc3);
 105         sub22(0,0xa0);
 106 #endif
 107         restore_flags(flags);
 108 
 109         ide_hwifs[0].serialized = 1;
 110         ide_hwifs[0].chipset = ide_dtc2278;
 111         ide_hwifs[1].chipset = ide_dtc2278;
 112         ide_hwifs[0].tuneproc = &tune_dtc2278;
 113         ide_hwifs[0].no_unmask = 1;
 114         ide_hwifs[1].no_unmask = 1;
 115 }
/* */
root/drivers/block/dtc2278.c

DEFINITIONS
