io.c

来自「linux 内核源代码」· C语言 代码 · 共 129 行

/*
 * Copyright (C) 2000 David J. Mckay ([e-mail])
 *
 * May be copied or modified under the terms of the GNU General Public
 * License.  See linux/COPYING for more information.
 *
 * This file contains the I/O routines for use on the overdrive board
 *
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <asm/system.h>
#include <asm/processor.h>
#include <asm/io.h>

/*  Now for the string version of these functions */
void outsb(unsigned long port, const void *addr, unsigned long count)
{
	int i;
	unsigned char *p = (unsigned char *) addr;

	for (i = 0; i < count; i++, p++) {
		outb(*p, port);
	}
}
EXPORT_SYMBOL(outsb);

void insb(unsigned long port, void *addr, unsigned long count)
{
	int i;
	unsigned char *p = (unsigned char *) addr;

	for (i = 0; i < count; i++, p++) {
		*p = inb(port);
	}
}
EXPORT_SYMBOL(insb);

/* For the 16 and 32 bit string functions, we have to worry about alignment.
 * The SH does not do unaligned accesses, so we have to read as bytes and
 * then write as a word or dword.
 * This can be optimised a lot more, especially in the case where the data
 * is aligned
 */

void outsw(unsigned long port, const void *addr, unsigned long count)
{
	int i;
	unsigned short tmp;
	unsigned char *p = (unsigned char *) addr;

	for (i = 0; i < count; i++, p += 2) {
		tmp = (*p) | ((*(p + 1)) << 8);
		outw(tmp, port);
	}
}
EXPORT_SYMBOL(outsw);

void insw(unsigned long port, void *addr, unsigned long count)
{
	int i;
	unsigned short tmp;
	unsigned char *p = (unsigned char *) addr;

	for (i = 0; i < count; i++, p += 2) {
		tmp = inw(port);
		p[0] = tmp & 0xff;
		p[1] = (tmp >> 8) & 0xff;
	}
}
EXPORT_SYMBOL(insw);

void outsl(unsigned long port, const void *addr, unsigned long count)
{
	int i;
	unsigned tmp;
	unsigned char *p = (unsigned char *) addr;

	for (i = 0; i < count; i++, p += 4) {
		tmp = (*p) | ((*(p + 1)) << 8) | ((*(p + 2)) << 16) |
		    ((*(p + 3)) << 24);
		outl(tmp, port);
	}
}
EXPORT_SYMBOL(outsl);

void insl(unsigned long port, void *addr, unsigned long count)
{
	int i;
	unsigned tmp;
	unsigned char *p = (unsigned char *) addr;

	for (i = 0; i < count; i++, p += 4) {
		tmp = inl(port);
		p[0] = tmp & 0xff;
		p[1] = (tmp >> 8) & 0xff;
		p[2] = (tmp >> 16) & 0xff;
		p[3] = (tmp >> 24) & 0xff;

	}
}
EXPORT_SYMBOL(insl);

void memcpy_toio(void __iomem *to, const void *from, long count)
{
	unsigned char *p = (unsigned char *) from;

	while (count) {
		count--;
		writeb(*p++, to++);
	}
}
EXPORT_SYMBOL(memcpy_toio);

void memcpy_fromio(void *to, void __iomem *from, long count)
{
	int i;
	unsigned char *p = (unsigned char *) to;

	for (i = 0; i < count; i++) {
		p[i] = readb(from);
		from++;
	}
}
EXPORT_SYMBOL(memcpy_fromio);