489 lines
9.7 KiB
C
489 lines
9.7 KiB
C
/*
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* arch/parisc/lib/io.c
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*
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* Copyright (c) Matthew Wilcox 2001 for Hewlett-Packard
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* Copyright (c) Randolph Chung 2001 <tausq@debian.org>
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*
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* IO accessing functions which shouldn't be inlined because they're too big
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <asm/io.h>
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/* Copies a block of memory to a device in an efficient manner.
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* Assumes the device can cope with 32-bit transfers. If it can't,
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* don't use this function.
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*/
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void memcpy_toio(volatile void __iomem *dst, const void *src, int count)
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{
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if (((unsigned long)dst & 3) != ((unsigned long)src & 3))
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goto bytecopy;
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while ((unsigned long)dst & 3) {
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writeb(*(char *)src, dst++);
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src++;
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count--;
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}
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while (count > 3) {
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__raw_writel(*(u32 *)src, dst);
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src += 4;
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dst += 4;
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count -= 4;
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}
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bytecopy:
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while (count--) {
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writeb(*(char *)src, dst++);
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src++;
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}
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}
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/*
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** Copies a block of memory from a device in an efficient manner.
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** Assumes the device can cope with 32-bit transfers. If it can't,
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** don't use this function.
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**
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** CR16 counts on C3000 reading 256 bytes from Symbios 896 RAM:
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** 27341/64 = 427 cyc per int
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** 61311/128 = 478 cyc per short
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** 122637/256 = 479 cyc per byte
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** Ergo bus latencies dominant (not transfer size).
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** Minimize total number of transfers at cost of CPU cycles.
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** TODO: only look at src alignment and adjust the stores to dest.
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*/
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void memcpy_fromio(void *dst, const volatile void __iomem *src, int count)
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{
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/* first compare alignment of src/dst */
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if ( (((unsigned long)dst ^ (unsigned long)src) & 1) || (count < 2) )
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goto bytecopy;
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if ( (((unsigned long)dst ^ (unsigned long)src) & 2) || (count < 4) )
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goto shortcopy;
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/* Then check for misaligned start address */
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if ((unsigned long)src & 1) {
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*(u8 *)dst = readb(src);
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src++;
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dst++;
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count--;
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if (count < 2) goto bytecopy;
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}
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if ((unsigned long)src & 2) {
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*(u16 *)dst = __raw_readw(src);
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src += 2;
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dst += 2;
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count -= 2;
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}
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while (count > 3) {
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*(u32 *)dst = __raw_readl(src);
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dst += 4;
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src += 4;
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count -= 4;
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}
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shortcopy:
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while (count > 1) {
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*(u16 *)dst = __raw_readw(src);
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src += 2;
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dst += 2;
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count -= 2;
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}
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bytecopy:
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while (count--) {
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*(char *)dst = readb(src);
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src++;
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dst++;
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}
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}
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/* Sets a block of memory on a device to a given value.
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* Assumes the device can cope with 32-bit transfers. If it can't,
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* don't use this function.
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*/
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void memset_io(volatile void __iomem *addr, unsigned char val, int count)
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{
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u32 val32 = (val << 24) | (val << 16) | (val << 8) | val;
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while ((unsigned long)addr & 3) {
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writeb(val, addr++);
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count--;
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}
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while (count > 3) {
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__raw_writel(val32, addr);
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addr += 4;
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count -= 4;
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}
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while (count--) {
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writeb(val, addr++);
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}
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}
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/*
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* Read COUNT 8-bit bytes from port PORT into memory starting at
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* SRC.
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*/
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void insb (unsigned long port, void *dst, unsigned long count)
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{
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unsigned char *p;
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p = (unsigned char *)dst;
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while (((unsigned long)p) & 0x3) {
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if (!count)
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return;
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count--;
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*p = inb(port);
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p++;
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}
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while (count >= 4) {
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unsigned int w;
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count -= 4;
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w = inb(port) << 24;
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w |= inb(port) << 16;
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w |= inb(port) << 8;
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w |= inb(port);
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*(unsigned int *) p = w;
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p += 4;
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}
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while (count) {
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--count;
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*p = inb(port);
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p++;
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}
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}
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/*
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* Read COUNT 16-bit words from port PORT into memory starting at
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* SRC. SRC must be at least short aligned. This is used by the
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* IDE driver to read disk sectors. Performance is important, but
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* the interfaces seems to be slow: just using the inlined version
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* of the inw() breaks things.
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*/
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void insw (unsigned long port, void *dst, unsigned long count)
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{
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unsigned int l = 0, l2;
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unsigned char *p;
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p = (unsigned char *)dst;
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if (!count)
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return;
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switch (((unsigned long)p) & 0x3)
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{
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case 0x00: /* Buffer 32-bit aligned */
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while (count>=2) {
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count -= 2;
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l = cpu_to_le16(inw(port)) << 16;
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l |= cpu_to_le16(inw(port));
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*(unsigned int *)p = l;
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p += 4;
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}
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if (count) {
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*(unsigned short *)p = cpu_to_le16(inw(port));
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}
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break;
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case 0x02: /* Buffer 16-bit aligned */
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*(unsigned short *)p = cpu_to_le16(inw(port));
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p += 2;
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count--;
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while (count>=2) {
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count -= 2;
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l = cpu_to_le16(inw(port)) << 16;
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l |= cpu_to_le16(inw(port));
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*(unsigned int *)p = l;
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p += 4;
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}
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if (count) {
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*(unsigned short *)p = cpu_to_le16(inw(port));
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}
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break;
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case 0x01: /* Buffer 8-bit aligned */
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case 0x03:
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/* I don't bother with 32bit transfers
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* in this case, 16bit will have to do -- DE */
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--count;
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l = cpu_to_le16(inw(port));
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*p = l >> 8;
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p++;
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while (count--)
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{
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l2 = cpu_to_le16(inw(port));
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*(unsigned short *)p = (l & 0xff) << 8 | (l2 >> 8);
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p += 2;
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l = l2;
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}
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*p = l & 0xff;
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break;
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}
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}
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/*
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* Read COUNT 32-bit words from port PORT into memory starting at
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* SRC. Now works with any alignment in SRC. Performance is important,
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* but the interfaces seems to be slow: just using the inlined version
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* of the inl() breaks things.
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*/
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void insl (unsigned long port, void *dst, unsigned long count)
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{
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unsigned int l = 0, l2;
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unsigned char *p;
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p = (unsigned char *)dst;
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if (!count)
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return;
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switch (((unsigned long) dst) & 0x3)
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{
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case 0x00: /* Buffer 32-bit aligned */
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while (count--)
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{
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*(unsigned int *)p = cpu_to_le32(inl(port));
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p += 4;
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}
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break;
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case 0x02: /* Buffer 16-bit aligned */
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--count;
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l = cpu_to_le32(inl(port));
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*(unsigned short *)p = l >> 16;
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p += 2;
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while (count--)
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{
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l2 = cpu_to_le32(inl(port));
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*(unsigned int *)p = (l & 0xffff) << 16 | (l2 >> 16);
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p += 4;
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l = l2;
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}
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*(unsigned short *)p = l & 0xffff;
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break;
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case 0x01: /* Buffer 8-bit aligned */
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--count;
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l = cpu_to_le32(inl(port));
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*(unsigned char *)p = l >> 24;
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p++;
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*(unsigned short *)p = (l >> 8) & 0xffff;
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p += 2;
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while (count--)
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{
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l2 = cpu_to_le32(inl(port));
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*(unsigned int *)p = (l & 0xff) << 24 | (l2 >> 8);
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p += 4;
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l = l2;
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}
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*p = l & 0xff;
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break;
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case 0x03: /* Buffer 8-bit aligned */
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--count;
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l = cpu_to_le32(inl(port));
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*p = l >> 24;
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p++;
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while (count--)
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{
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l2 = cpu_to_le32(inl(port));
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*(unsigned int *)p = (l & 0xffffff) << 8 | l2 >> 24;
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p += 4;
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l = l2;
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}
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*(unsigned short *)p = (l >> 8) & 0xffff;
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p += 2;
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*p = l & 0xff;
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break;
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}
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}
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/*
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* Like insb but in the opposite direction.
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* Don't worry as much about doing aligned memory transfers:
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* doing byte reads the "slow" way isn't nearly as slow as
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* doing byte writes the slow way (no r-m-w cycle).
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*/
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void outsb(unsigned long port, const void * src, unsigned long count)
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{
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const unsigned char *p;
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p = (const unsigned char *)src;
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while (count) {
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count--;
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outb(*p, port);
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p++;
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}
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}
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/*
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* Like insw but in the opposite direction. This is used by the IDE
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* driver to write disk sectors. Performance is important, but the
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* interfaces seems to be slow: just using the inlined version of the
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* outw() breaks things.
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*/
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void outsw (unsigned long port, const void *src, unsigned long count)
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{
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unsigned int l = 0, l2;
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const unsigned char *p;
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p = (const unsigned char *)src;
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if (!count)
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return;
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switch (((unsigned long)p) & 0x3)
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{
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case 0x00: /* Buffer 32-bit aligned */
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while (count>=2) {
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count -= 2;
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l = *(unsigned int *)p;
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p += 4;
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outw(le16_to_cpu(l >> 16), port);
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outw(le16_to_cpu(l & 0xffff), port);
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}
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if (count) {
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outw(le16_to_cpu(*(unsigned short*)p), port);
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}
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break;
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case 0x02: /* Buffer 16-bit aligned */
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outw(le16_to_cpu(*(unsigned short*)p), port);
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p += 2;
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count--;
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while (count>=2) {
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count -= 2;
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l = *(unsigned int *)p;
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p += 4;
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outw(le16_to_cpu(l >> 16), port);
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outw(le16_to_cpu(l & 0xffff), port);
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}
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if (count) {
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outw(le16_to_cpu(*(unsigned short *)p), port);
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}
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break;
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case 0x01: /* Buffer 8-bit aligned */
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/* I don't bother with 32bit transfers
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* in this case, 16bit will have to do -- DE */
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l = *p << 8;
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p++;
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count--;
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while (count)
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{
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count--;
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l2 = *(unsigned short *)p;
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p += 2;
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outw(le16_to_cpu(l | l2 >> 8), port);
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l = l2 << 8;
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}
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l2 = *(unsigned char *)p;
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outw (le16_to_cpu(l | l2>>8), port);
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break;
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}
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}
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/*
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* Like insl but in the opposite direction. This is used by the IDE
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* driver to write disk sectors. Works with any alignment in SRC.
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* Performance is important, but the interfaces seems to be slow:
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* just using the inlined version of the outl() breaks things.
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*/
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void outsl (unsigned long port, const void *src, unsigned long count)
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{
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unsigned int l = 0, l2;
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const unsigned char *p;
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p = (const unsigned char *)src;
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if (!count)
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return;
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switch (((unsigned long)p) & 0x3)
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{
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case 0x00: /* Buffer 32-bit aligned */
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while (count--)
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{
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outl(le32_to_cpu(*(unsigned int *)p), port);
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p += 4;
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}
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break;
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case 0x02: /* Buffer 16-bit aligned */
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--count;
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l = *(unsigned short *)p;
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p += 2;
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while (count--)
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{
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l2 = *(unsigned int *)p;
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p += 4;
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outl (le32_to_cpu(l << 16 | l2 >> 16), port);
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l = l2;
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}
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l2 = *(unsigned short *)p;
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outl (le32_to_cpu(l << 16 | l2), port);
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break;
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case 0x01: /* Buffer 8-bit aligned */
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--count;
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l = *p << 24;
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p++;
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l |= *(unsigned short *)p << 8;
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p += 2;
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while (count--)
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{
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l2 = *(unsigned int *)p;
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p += 4;
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outl (le32_to_cpu(l | l2 >> 24), port);
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l = l2 << 8;
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}
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l2 = *p;
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outl (le32_to_cpu(l | l2), port);
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break;
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case 0x03: /* Buffer 8-bit aligned */
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--count;
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l = *p << 24;
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p++;
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while (count--)
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{
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l2 = *(unsigned int *)p;
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p += 4;
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outl (le32_to_cpu(l | l2 >> 8), port);
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l = l2 << 24;
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}
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l2 = *(unsigned short *)p << 16;
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p += 2;
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l2 |= *p;
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outl (le32_to_cpu(l | l2), port);
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break;
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}
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}
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EXPORT_SYMBOL(insb);
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EXPORT_SYMBOL(insw);
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EXPORT_SYMBOL(insl);
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EXPORT_SYMBOL(outsb);
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EXPORT_SYMBOL(outsw);
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EXPORT_SYMBOL(outsl);
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