71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
/*
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* arch/sh/boards/renesas/edosk7705/io.c
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*
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* Copyright (C) 2001 Ian da Silva, Jeremy Siegel
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* Based largely on io_se.c.
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*
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* I/O routines for Hitachi EDOSK7705 board.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/io.h>
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#include <mach/edosk7705.h>
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#include <asm/addrspace.h>
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#define SMC_IOADDR 0xA2000000
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/* Map the Ethernet addresses as if it is at 0x300 - 0x320 */
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static unsigned long sh_edosk7705_isa_port2addr(unsigned long port)
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{
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/*
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* SMC91C96 registers are 4 byte aligned rather than the
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* usual 2 byte!
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*/
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if (port >= 0x300 && port < 0x320)
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return SMC_IOADDR + ((port - 0x300) * 2);
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maybebadio(port);
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return port;
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}
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/* Trying to read / write bytes on odd-byte boundaries to the Ethernet
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* registers causes problems. So we bit-shift the value and read / write
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* in 2 byte chunks. Setting the low byte to 0 does not cause problems
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* now as odd byte writes are only made on the bit mask / interrupt
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* register. This may not be the case in future Mar-2003 SJD
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*/
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unsigned char sh_edosk7705_inb(unsigned long port)
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{
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if (port >= 0x300 && port < 0x320 && port & 0x01)
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return __raw_readw(port - 1) >> 8;
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return __raw_readb(sh_edosk7705_isa_port2addr(port));
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}
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void sh_edosk7705_outb(unsigned char value, unsigned long port)
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{
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if (port >= 0x300 && port < 0x320 && port & 0x01) {
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__raw_writew(((unsigned short)value << 8), port - 1);
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return;
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}
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__raw_writeb(value, sh_edosk7705_isa_port2addr(port));
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}
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void sh_edosk7705_insb(unsigned long port, void *addr, unsigned long count)
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{
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unsigned char *p = addr;
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while (count--)
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*p++ = sh_edosk7705_inb(port);
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}
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void sh_edosk7705_outsb(unsigned long port, const void *addr, unsigned long count)
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{
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unsigned char *p = (unsigned char *)addr;
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while (count--)
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sh_edosk7705_outb(*p++, port);
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}
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