drivers/ide/legacy/pc9800.c

   1 /*
   2  *  ide_pc9800.c
   3  *
   4  *  Copyright (C) 1997-2000  Linux/98 project,
   5  *                           Kyoto University Microcomputer Club.
   6  */
   7
   8 #include <linux/config.h>
   9 #include <linux/kernel.h>
  10 #include <linux/ioport.h>
  11 #include <linux/ide.h>
  12 #include <linux/init.h>
  13
  14 #include <asm/io.h>
  15 #include <asm/pc9800.h>
  16
  17 #define PC9800_IDE_BANKSELECT   0x432
  18
  19 #undef PC9800_IDE_DEBUG
  20
  21 static void pc9800_select(ide_drive_t *drive)
  22 {
  23 #ifdef PC9800_IDE_DEBUG
  24         byte old;
  25
  26         /* Too noisy: */
  27         /* printk(KERN_DEBUG "pc9800_select(%s)\n", drive->name); */
  28
  29         outb(0x80, PC9800_IDE_BANKSELECT);
  30         old = inb(PC9800_IDE_BANKSELECT);
  31         if (old != HWIF(drive)->index)
  32                 printk(KERN_DEBUG "ide-pc9800: switching bank #%d -> #%d\n",
  33                         old, HWIF(drive)->index);
  34 #endif
  35         outb(HWIF(drive)->index, PC9800_IDE_BANKSELECT);
  36 }
  37
  38 void __init ide_probe_for_pc9800(void)
  39 {
  40         u8 saved_bank;
  41
  42         if (!PC9800_9821_P() /* || !PC9821_IDEIF_DOUBLE_P() */)
  43                 return;
  44
  45         if (!request_region(PC9800_IDE_BANKSELECT, 1, "ide0/1 bank")) {
  46                 printk(KERN_ERR
  47                         "ide: bank select port (%#x) is already occupied!\n",
  48                         PC9800_IDE_BANKSELECT);
  49                 return;
  50         }
  51
  52         /* Do actual probing. */
  53         if ((saved_bank = inb(PC9800_IDE_BANKSELECT)) == (u8) ~0
  54             || (outb(saved_bank ^ 1, PC9800_IDE_BANKSELECT),
  55                 /* Next outb is dummy for reading status. */
  56                 outb(0x80, PC9800_IDE_BANKSELECT),
  57                 inb(PC9800_IDE_BANKSELECT) != (saved_bank ^ 1))) {
  58                 printk(KERN_INFO
  59                         "ide: pc9800 type bank selecting port not found\n");
  60                 release_region(PC9800_IDE_BANKSELECT, 1);
  61                 return;
  62         }
  63
  64         /* Restore original value, just in case. */
  65         outb(saved_bank, PC9800_IDE_BANKSELECT);
  66
  67         /* These ports are reseved by IDE I/F.  */
  68         if (!request_region(0x430, 1, "ide") ||
  69             !request_region(0x435, 1, "ide")) {
  70                 printk(KERN_WARNING
  71                         "ide: IO port 0x430 and 0x435 are reserved for IDE"
  72                         " the card using these ports may not work\n");
  73         }
  74
  75         if (ide_hwifs[0].io_ports[IDE_DATA_OFFSET] == HD_DATA &&
  76             ide_hwifs[1].io_ports[IDE_DATA_OFFSET] == HD_DATA) {
  77                 ide_hwifs[0].chipset = ide_pc9800;
  78                 ide_hwifs[0].mate = &ide_hwifs[1];
  79                 ide_hwifs[0].selectproc = pc9800_select;
  80                 ide_hwifs[1].chipset = ide_pc9800;
  81                 ide_hwifs[1].mate = &ide_hwifs[0];
  82                 ide_hwifs[1].selectproc = pc9800_select;
  83         }
  84 }