arch/sh/boards/ec3104/io.c

   1 /*
   2  * linux/arch/sh/kernel/io_ec3104.c
   3  *  EC3104 companion chip support
   4  *
   5  * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
   6  *
   7  */
   8 /* EC3104 note:
   9  * This code was written without any documentation about the EC3104 chip.  While
  10  * I hope I got most of the basic functionality right, the register names I use
  11  * are most likely completely different from those in the chip documentation.
  12  *
  13  * If you have any further information about the EC3104, please tell me
  14  * (prumpf@tux.org).
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/types.h>
  19 #include <asm/io.h>
  20 #include <asm/page.h>
  21 #include <asm/ec3104/ec3104.h>
  22
  23 /*
  24  * EC3104 has a real ISA bus which we redirect low port accesses to (the
  25  * actual device on mine is a ESS 1868, and I don't want to hack the driver
  26  * more than strictly necessary).  I am not going to duplicate the
  27  * hard coding of PC addresses (for the 16550s aso) here though;  it's just
  28  * too ugly.
  29  */
  30
  31 #define low_port(port) ((port) < 0x10000)
  32
  33 static inline unsigned long port2addr(unsigned long port)
  34 {
  35         switch(port >> 16) {
  36         case 0:
  37                 return EC3104_ISA_BASE + port * 2;
  38
  39                 /* XXX hack. it's unclear what to do about the serial ports */
  40         case 1:
  41                 return EC3104_BASE + (port&0xffff) * 4;
  42
  43         default:
  44                 /* XXX PCMCIA */
  45                 return 0;
  46         }
  47 }
  48
  49 unsigned char ec3104_inb(unsigned long port)
  50 {
  51         u8 ret;
  52
  53         ret = *(volatile u8 *)port2addr(port);
  54
  55         return ret;
  56 }
  57
  58 unsigned short ec3104_inw(unsigned long port)
  59 {
  60         BUG();
  61 }
  62
  63 unsigned long ec3104_inl(unsigned long port)
  64 {
  65         BUG();
  66 }
  67
  68 void ec3104_outb(unsigned char data, unsigned long port)
  69 {
  70         *(volatile u8 *)port2addr(port) = data;
  71 }
  72
  73 void ec3104_outw(unsigned short data, unsigned long port)
  74 {
  75         BUG();
  76 }
  77
  78 void ec3104_outl(unsigned long data, unsigned long port)
  79 {
  80         BUG();
  81 }