2 * arch/sh/boards/renesas/edosk7705/io.c
4 * Copyright (C) 2001 Ian da Silva, Jeremy Siegel
5 * Based largely on io_se.c.
7 * I/O routines for Hitachi EDOSK7705 board.
11 #include <linux/kernel.h>
12 #include <linux/types.h>
14 #include <mach/edosk7705.h>
15 #include <asm/addrspace.h>
17 #define SMC_IOADDR 0xA2000000
19 /* Map the Ethernet addresses as if it is at 0x300 - 0x320 */
20 static unsigned long sh_edosk7705_isa_port2addr(unsigned long port)
23 * SMC91C96 registers are 4 byte aligned rather than the
26 if (port >= 0x300 && port < 0x320)
27 return SMC_IOADDR + ((port - 0x300) * 2);
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
39 unsigned char sh_edosk7705_inb(unsigned long port)
41 if (port >= 0x300 && port < 0x320 && port & 0x01)
42 return __raw_readw(port - 1) >> 8;
44 return __raw_readb(sh_edosk7705_isa_port2addr(port));
47 void sh_edosk7705_outb(unsigned char value, unsigned long port)
49 if (port >= 0x300 && port < 0x320 && port & 0x01) {
50 __raw_writew(((unsigned short)value << 8), port - 1);
54 __raw_writeb(value, sh_edosk7705_isa_port2addr(port));
57 void sh_edosk7705_insb(unsigned long port, void *addr, unsigned long count)
59 unsigned char *p = addr;
62 *p++ = sh_edosk7705_inb(port);
65 void sh_edosk7705_outsb(unsigned long port, const void *addr, unsigned long count)
67 unsigned char *p = (unsigned char *)addr;
70 sh_edosk7705_outb(*p++, port);