io_ec3104.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:2k
- /*
- * linux/arch/sh/kernel/io_ec3104.c
- * EC3104 companion chip support
- *
- * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
- *
- */
- /* EC3104 note:
- * This code was written without any documentation about the EC3104 chip. While
- * I hope I got most of the basic functionality right, the register names I use
- * are most likely completely different from those in the chip documentation.
- *
- * If you have any further information about the EC3104, please tell me
- * (prumpf@tux.org).
- */
- #include <linux/kernel.h>
- #include <linux/types.h>
- #include <asm/io.h>
- #include <asm/page.h>
- #include <asm/ec3104.h>
- /*
- * EC3104 has a real ISA bus which we redirect low port accesses to (the
- * actual device on mine is a ESS 1868, and I don't want to hack the driver
- * more than strictly necessary). I am not going to duplicate the
- * hard coding of PC addresses (for the 16550s aso) here though; it's just
- * too ugly.
- */
- #define low_port(port) ((port) < 0x10000)
- static inline unsigned long port2addr(unsigned long port)
- {
- switch(port >> 16) {
- case 0:
- return EC3104_ISA_BASE + port * 2;
- /* XXX hack. it's unclear what to do about the serial ports */
- case 1:
- return EC3104_BASE + (port&0xffff) * 4;
- default:
- /* XXX PCMCIA */
- return 0;
- }
- }
- unsigned char ec3104_inb(unsigned long port)
- {
- u8 ret;
- ret = *(volatile u8 *)port2addr(port);
- return ret;
- }
- unsigned short ec3104_inw(unsigned long port)
- {
- BUG();
- }
- unsigned long ec3104_inl(unsigned long port)
- {
- BUG();
- }
- void ec3104_outb(unsigned char data, unsigned long port)
- {
- *(volatile u8 *)port2addr(port) = data;
- }
- void ec3104_outw(unsigned short data, unsigned long port)
- {
- BUG();
- }
- void ec3104_outl(unsigned long data, unsigned long port)
- {
- BUG();
- }