arch/sh/boards/mach-edosk7705/io.c

   1 /*
   2  * arch/sh/boards/renesas/edosk7705/io.c
   3  *
   4  * Copyright (C) 2001  Ian da Silva, Jeremy Siegel
   5  * Based largely on io_se.c.
   6  *
   7  * I/O routines for Hitachi EDOSK7705 board.
   8  *
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/types.h>
  13 #include <linux/io.h>
  14 #include <mach/edosk7705.h>
  15 #include <asm/addrspace.h>
  16
  17 #define SMC_IOADDR      0xA2000000
  18
  19 /* Map the Ethernet addresses as if it is at 0x300 - 0x320 */
  20 static unsigned long sh_edosk7705_isa_port2addr(unsigned long port)
  21 {
  22         /*
  23          * SMC91C96 registers are 4 byte aligned rather than the
  24          * usual 2 byte!
  25          */
  26         if (port >= 0x300 && port < 0x320)
  27                 return SMC_IOADDR + ((port - 0x300) * 2);
  28
  29         maybebadio(port);
  30         return port;
  31 }
  32
  33 /* Trying to read / write bytes on odd-byte boundaries to the Ethernet
  34  * registers causes problems. So we bit-shift the value and read / write
  35  * in 2 byte chunks. Setting the low byte to 0 does not cause problems
  36  * now as odd byte writes are only made on the bit mask / interrupt
  37  * register. This may not be the case in future Mar-2003 SJD
  38  */
  39 unsigned char sh_edosk7705_inb(unsigned long port)
  40 {
  41         if (port >= 0x300 && port < 0x320 && port & 0x01)
  42                 return __raw_readw(port - 1) >> 8;
  43
  44         return __raw_readb(sh_edosk7705_isa_port2addr(port));
  45 }
  46
  47 void sh_edosk7705_outb(unsigned char value, unsigned long port)
  48 {
  49         if (port >= 0x300 && port < 0x320 && port & 0x01) {
  50                 __raw_writew(((unsigned short)value << 8), port - 1);
  51                 return;
  52         }
  53
  54         __raw_writeb(value, sh_edosk7705_isa_port2addr(port));
  55 }
  56
  57 void sh_edosk7705_insb(unsigned long port, void *addr, unsigned long count)
  58 {
  59         unsigned char *p = addr;
  60
  61         while (count--)
  62                 *p++ = sh_edosk7705_inb(port);
  63 }
  64
  65 void sh_edosk7705_outsb(unsigned long port, const void *addr, unsigned long count)
  66 {
  67         unsigned char *p = (unsigned char *)addr;
  68
  69         while (count--)
  70                 sh_edosk7705_outb(*p++, port);
  71 }