140 строки
3.2 KiB
C
140 строки
3.2 KiB
C
/*
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* Copyright (C) 2000 David J. Mckay (david.mckay@st.com)
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*
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* May be copied or modified under the terms of the GNU General Public
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* License. See linux/COPYING for more information.
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*
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* This file contains the I/O routines for use on the overdrive 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/delay.h>
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#include <asm/system.h>
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#include <asm/processor.h>
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#include <asm/io.h>
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/*
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* readX/writeX() are used to access memory mapped devices. On some
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* architectures the memory mapped IO stuff needs to be accessed
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* differently. On the SuperH architecture, we just read/write the
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* memory location directly.
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*/
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/* This is horrible at the moment - needs more work to do something sensible */
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#define IO_DELAY()
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#define OUT_DELAY(x,type) \
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void out##x##_p(unsigned type value,unsigned long port){out##x(value,port);IO_DELAY();}
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#define IN_DELAY(x,type) \
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unsigned type in##x##_p(unsigned long port) {unsigned type tmp=in##x(port);IO_DELAY();return tmp;}
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#if 1
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OUT_DELAY(b, long) OUT_DELAY(w, long) OUT_DELAY(l, long)
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IN_DELAY(b, long) IN_DELAY(w, long) IN_DELAY(l, long)
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#endif
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/* Now for the string version of these functions */
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void outsb(unsigned long port, const void *addr, unsigned long count)
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{
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int i;
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unsigned char *p = (unsigned char *) addr;
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for (i = 0; i < count; i++, p++) {
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outb(*p, port);
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}
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}
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void insb(unsigned long port, void *addr, unsigned long count)
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{
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int i;
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unsigned char *p = (unsigned char *) addr;
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for (i = 0; i < count; i++, p++) {
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*p = inb(port);
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}
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}
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/* For the 16 and 32 bit string functions, we have to worry about alignment.
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* The SH does not do unaligned accesses, so we have to read as bytes and
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* then write as a word or dword.
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* This can be optimised a lot more, especially in the case where the data
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* is aligned
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*/
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void outsw(unsigned long port, const void *addr, unsigned long count)
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{
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int i;
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unsigned short tmp;
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unsigned char *p = (unsigned char *) addr;
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for (i = 0; i < count; i++, p += 2) {
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tmp = (*p) | ((*(p + 1)) << 8);
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outw(tmp, port);
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}
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}
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void insw(unsigned long port, void *addr, unsigned long count)
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{
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int i;
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unsigned short tmp;
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unsigned char *p = (unsigned char *) addr;
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for (i = 0; i < count; i++, p += 2) {
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tmp = inw(port);
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p[0] = tmp & 0xff;
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p[1] = (tmp >> 8) & 0xff;
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}
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}
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void outsl(unsigned long port, const void *addr, unsigned long count)
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{
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int i;
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unsigned tmp;
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unsigned char *p = (unsigned char *) addr;
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for (i = 0; i < count; i++, p += 4) {
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tmp = (*p) | ((*(p + 1)) << 8) | ((*(p + 2)) << 16) |
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((*(p + 3)) << 24);
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outl(tmp, port);
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}
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}
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void insl(unsigned long port, void *addr, unsigned long count)
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{
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int i;
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unsigned tmp;
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unsigned char *p = (unsigned char *) addr;
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for (i = 0; i < count; i++, p += 4) {
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tmp = inl(port);
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p[0] = tmp & 0xff;
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p[1] = (tmp >> 8) & 0xff;
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p[2] = (tmp >> 16) & 0xff;
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p[3] = (tmp >> 24) & 0xff;
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}
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}
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void memcpy_toio(void __iomem *to, const void *from, long count)
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{
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unsigned char *p = (unsigned char *) from;
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while (count) {
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count--;
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writeb(*p++, to++);
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}
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}
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void memcpy_fromio(void *to, void __iomem *from, long count)
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{
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int i;
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unsigned char *p = (unsigned char *) to;
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for (i = 0; i < count; i++) {
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p[i] = readb(from);
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from++;
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}
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}
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