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linux/arch/alpha/kernel/io.c
Linus Torvalds 1da177e4c3 Linux-2.6.12-rc2 
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!
2005-04-16 15:20:36 -07:00

630 lines
12 KiB
C
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/*
* Alpha IO and memory functions.
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/module.h>
#include <asm/io.h>
/* Out-of-line versions of the i/o routines that redirect into the
platform-specific version. Note that "platform-specific" may mean
"generic", which bumps through the machine vector. */
unsigned int
ioread8(void __iomem *addr)
{
unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread8)(addr);
mb();
return ret;
}
unsigned int ioread16(void __iomem *addr)
{
unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread16)(addr);
mb();
return ret;
}
unsigned int ioread32(void __iomem *addr)
{
unsigned int ret = IO_CONCAT(__IO_PREFIX,ioread32)(addr);
mb();
return ret;
}
void iowrite8(u8 b, void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,iowrite8)(b, addr);
mb();
}
void iowrite16(u16 b, void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,iowrite16)(b, addr);
mb();
}
void iowrite32(u32 b, void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,iowrite32)(b, addr);
mb();
}
EXPORT_SYMBOL(ioread8);
EXPORT_SYMBOL(ioread16);
EXPORT_SYMBOL(ioread32);
EXPORT_SYMBOL(iowrite8);
EXPORT_SYMBOL(iowrite16);
EXPORT_SYMBOL(iowrite32);
u8 inb(unsigned long port)
{
return ioread8(ioport_map(port, 1));
}
u16 inw(unsigned long port)
{
return ioread16(ioport_map(port, 2));
}
u32 inl(unsigned long port)
{
return ioread32(ioport_map(port, 4));
}
void outb(u8 b, unsigned long port)
{
iowrite8(b, ioport_map(port, 1));
}
void outw(u16 b, unsigned long port)
{
iowrite16(b, ioport_map(port, 2));
}
void outl(u32 b, unsigned long port)
{
iowrite32(b, ioport_map(port, 4));
}
EXPORT_SYMBOL(inb);
EXPORT_SYMBOL(inw);
EXPORT_SYMBOL(inl);
EXPORT_SYMBOL(outb);
EXPORT_SYMBOL(outw);
EXPORT_SYMBOL(outl);
u8 __raw_readb(const volatile void __iomem *addr)
{
return IO_CONCAT(__IO_PREFIX,readb)(addr);
}
u16 __raw_readw(const volatile void __iomem *addr)
{
return IO_CONCAT(__IO_PREFIX,readw)(addr);
}
u32 __raw_readl(const volatile void __iomem *addr)
{
return IO_CONCAT(__IO_PREFIX,readl)(addr);
}
u64 __raw_readq(const volatile void __iomem *addr)
{
return IO_CONCAT(__IO_PREFIX,readq)(addr);
}
void __raw_writeb(u8 b, volatile void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,writeb)(b, addr);
}
void __raw_writew(u16 b, volatile void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,writew)(b, addr);
}
void __raw_writel(u32 b, volatile void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,writel)(b, addr);
}
void __raw_writeq(u64 b, volatile void __iomem *addr)
{
IO_CONCAT(__IO_PREFIX,writeq)(b, addr);
}
EXPORT_SYMBOL(__raw_readb);
EXPORT_SYMBOL(__raw_readw);
EXPORT_SYMBOL(__raw_readl);
EXPORT_SYMBOL(__raw_readq);
EXPORT_SYMBOL(__raw_writeb);
EXPORT_SYMBOL(__raw_writew);
EXPORT_SYMBOL(__raw_writel);
EXPORT_SYMBOL(__raw_writeq);
u8 readb(const volatile void __iomem *addr)
{
u8 ret = __raw_readb(addr);
mb();
return ret;
}
u16 readw(const volatile void __iomem *addr)
{
u16 ret = __raw_readw(addr);
mb();
return ret;
}
u32 readl(const volatile void __iomem *addr)
{
u32 ret = __raw_readl(addr);
mb();
return ret;
}
u64 readq(const volatile void __iomem *addr)
{
u64 ret = __raw_readq(addr);
mb();
return ret;
}
void writeb(u8 b, volatile void __iomem *addr)
{
__raw_writeb(b, addr);
mb();
}
void writew(u16 b, volatile void __iomem *addr)
{
__raw_writew(b, addr);
mb();
}
void writel(u32 b, volatile void __iomem *addr)
{
__raw_writel(b, addr);
mb();
}
void writeq(u64 b, volatile void __iomem *addr)
{
__raw_writeq(b, addr);
mb();
}
EXPORT_SYMBOL(readb);
EXPORT_SYMBOL(readw);
EXPORT_SYMBOL(readl);
EXPORT_SYMBOL(readq);
EXPORT_SYMBOL(writeb);
EXPORT_SYMBOL(writew);
EXPORT_SYMBOL(writel);
EXPORT_SYMBOL(writeq);
/*
* Read COUNT 8-bit bytes from port PORT into memory starting at SRC.
*/
void ioread8_rep(void __iomem *port, void *dst, unsigned long count)
{
while ((unsigned long)dst & 0x3) {
if (!count)
return;
count--;
*(unsigned char *)dst = ioread8(port);
dst += 1;
}
while (count >= 4) {
unsigned int w;
count -= 4;
w = ioread8(port);
w |= ioread8(port) << 8;
w |= ioread8(port) << 16;
w |= ioread8(port) << 24;
*(unsigned int *)dst = w;
dst += 4;
}
while (count) {
--count;
*(unsigned char *)dst = ioread8(port);
dst += 1;
}
}
void insb(unsigned long port, void *dst, unsigned long count)
{
ioread8_rep(ioport_map(port, 1), dst, count);
}
EXPORT_SYMBOL(ioread8_rep);
EXPORT_SYMBOL(insb);
/*
* Read COUNT 16-bit words from port PORT into memory starting at
* SRC. SRC must be at least short aligned. This is used by the
* IDE driver to read disk sectors. Performance is important, but
* the interfaces seems to be slow: just using the inlined version
* of the inw() breaks things.
*/
void ioread16_rep(void __iomem *port, void *dst, unsigned long count)
{
if (unlikely((unsigned long)dst & 0x3)) {
if (!count)
return;
BUG_ON((unsigned long)dst & 0x1);
count--;
*(unsigned short *)dst = ioread16(port);
dst += 2;
}
while (count >= 2) {
unsigned int w;
count -= 2;
w = ioread16(port);
w |= ioread16(port) << 16;
*(unsigned int *)dst = w;
dst += 4;
}
if (count) {
*(unsigned short*)dst = ioread16(port);
}
}
void insw(unsigned long port, void *dst, unsigned long count)
{
ioread16_rep(ioport_map(port, 2), dst, count);
}
EXPORT_SYMBOL(ioread16_rep);
EXPORT_SYMBOL(insw);
/*
* Read COUNT 32-bit words from port PORT into memory starting at
* SRC. Now works with any alignment in SRC. Performance is important,
* but the interfaces seems to be slow: just using the inlined version
* of the inl() breaks things.
*/
void ioread32_rep(void __iomem *port, void *dst, unsigned long count)
{
if (unlikely((unsigned long)dst & 0x3)) {
while (count--) {
struct S { int x __attribute__((packed)); };
((struct S *)dst)->x = ioread32(port);
dst += 4;
}
} else {
/* Buffer 32-bit aligned. */
while (count--) {
*(unsigned int *)dst = ioread32(port);
dst += 4;
}
}
}
void insl(unsigned long port, void *dst, unsigned long count)
{
ioread32_rep(ioport_map(port, 4), dst, count);
}
EXPORT_SYMBOL(ioread32_rep);
EXPORT_SYMBOL(insl);
/*
* Like insb but in the opposite direction.
* Don't worry as much about doing aligned memory transfers:
* doing byte reads the "slow" way isn't nearly as slow as
* doing byte writes the slow way (no r-m-w cycle).
*/
void iowrite8_rep(void __iomem *port, const void *xsrc, unsigned long count)
{
const unsigned char *src = xsrc;
while (count--)
iowrite8(*src++, port);
}
void outsb(unsigned long port, const void *src, unsigned long count)
{
iowrite8_rep(ioport_map(port, 1), src, count);
}
EXPORT_SYMBOL(iowrite8_rep);
EXPORT_SYMBOL(outsb);
/*
* Like insw but in the opposite direction. This is used by the IDE
* driver to write disk sectors. Performance is important, but the
* interfaces seems to be slow: just using the inlined version of the
* outw() breaks things.
*/
void iowrite16_rep(void __iomem *port, const void *src, unsigned long count)
{
if (unlikely((unsigned long)src & 0x3)) {
if (!count)
return;
BUG_ON((unsigned long)src & 0x1);
iowrite16(*(unsigned short *)src, port);
src += 2;
--count;
}
while (count >= 2) {
unsigned int w;
count -= 2;
w = *(unsigned int *)src;
src += 4;
iowrite16(w >> 0, port);
iowrite16(w >> 16, port);
}
if (count) {
iowrite16(*(unsigned short *)src, port);
}
}
void outsw(unsigned long port, const void *src, unsigned long count)
{
iowrite16_rep(ioport_map(port, 2), src, count);
}
EXPORT_SYMBOL(iowrite16_rep);
EXPORT_SYMBOL(outsw);
/*
* Like insl but in the opposite direction. This is used by the IDE
* driver to write disk sectors. Works with any alignment in SRC.
* Performance is important, but the interfaces seems to be slow:
* just using the inlined version of the outl() breaks things.
*/
void iowrite32_rep(void __iomem *port, const void *src, unsigned long count)
{
if (unlikely((unsigned long)src & 0x3)) {
while (count--) {
struct S { int x __attribute__((packed)); };
iowrite32(((struct S *)src)->x, port);
src += 4;
}
} else {
/* Buffer 32-bit aligned. */
while (count--) {
iowrite32(*(unsigned int *)src, port);
src += 4;
}
}
}
void outsl(unsigned long port, const void *src, unsigned long count)
{
iowrite32_rep(ioport_map(port, 4), src, count);
}
EXPORT_SYMBOL(iowrite32_rep);
EXPORT_SYMBOL(outsl);
/*
* Copy data from IO memory space to "real" memory space.
* This needs to be optimized.
*/
void memcpy_fromio(void *to, const volatile void __iomem *from, long count)
{
/* Optimize co-aligned transfers. Everything else gets handled
a byte at a time. */
if (count >= 8 && ((u64)to & 7) == ((u64)from & 7)) {
count -= 8;
do {
*(u64 *)to = __raw_readq(from);
count -= 8;
to += 8;
from += 8;
} while (count >= 0);
count += 8;
}
if (count >= 4 && ((u64)to & 3) == ((u64)from & 3)) {
count -= 4;
do {
*(u32 *)to = __raw_readl(from);
count -= 4;
to += 4;
from += 4;
} while (count >= 0);
count += 4;
}
if (count >= 2 && ((u64)to & 1) == ((u64)from & 1)) {
count -= 2;
do {
*(u16 *)to = __raw_readw(from);
count -= 2;
to += 2;
from += 2;
} while (count >= 0);
count += 2;
}
while (count > 0) {
*(u8 *) to = __raw_readb(from);
count--;
to++;
from++;
}
mb();
}
EXPORT_SYMBOL(memcpy_fromio);
/*
* Copy data from "real" memory space to IO memory space.
* This needs to be optimized.
*/
void memcpy_toio(volatile void __iomem *to, const void *from, long count)
{
/* Optimize co-aligned transfers. Everything else gets handled
a byte at a time. */
/* FIXME -- align FROM. */
if (count >= 8 && ((u64)to & 7) == ((u64)from & 7)) {
count -= 8;
do {
__raw_writeq(*(const u64 *)from, to);
count -= 8;
to += 8;
from += 8;
} while (count >= 0);
count += 8;
}
if (count >= 4 && ((u64)to & 3) == ((u64)from & 3)) {
count -= 4;
do {
__raw_writel(*(const u32 *)from, to);
count -= 4;
to += 4;
from += 4;
} while (count >= 0);
count += 4;
}
if (count >= 2 && ((u64)to & 1) == ((u64)from & 1)) {
count -= 2;
do {
__raw_writew(*(const u16 *)from, to);
count -= 2;
to += 2;
from += 2;
} while (count >= 0);
count += 2;
}
while (count > 0) {
__raw_writeb(*(const u8 *) from, to);
count--;
to++;
from++;
}
mb();
}
EXPORT_SYMBOL(memcpy_toio);
/*
* "memset" on IO memory space.
*/
void _memset_c_io(volatile void __iomem *to, unsigned long c, long count)
{
/* Handle any initial odd byte */
if (count > 0 && ((u64)to & 1)) {
__raw_writeb(c, to);
to++;
count--;
}
/* Handle any initial odd halfword */
if (count >= 2 && ((u64)to & 2)) {
__raw_writew(c, to);
to += 2;
count -= 2;
}
/* Handle any initial odd word */
if (count >= 4 && ((u64)to & 4)) {
__raw_writel(c, to);
to += 4;
count -= 4;
}
/* Handle all full-sized quadwords: we're aligned
(or have a small count) */
count -= 8;
if (count >= 0) {
do {
__raw_writeq(c, to);
to += 8;
count -= 8;
} while (count >= 0);
}
count += 8;
/* The tail is word-aligned if we still have count >= 4 */
if (count >= 4) {
__raw_writel(c, to);
to += 4;
count -= 4;
}
/* The tail is half-word aligned if we have count >= 2 */
if (count >= 2) {
__raw_writew(c, to);
to += 2;
count -= 2;
}
/* And finally, one last byte.. */
if (count) {
__raw_writeb(c, to);
}
mb();
}
EXPORT_SYMBOL(_memset_c_io);
/* A version of memcpy used by the vga console routines to move data around
arbitrarily between screen and main memory. */
void
scr_memcpyw(u16 *d, const u16 *s, unsigned int count)
{
const u16 __iomem *ios = (const u16 __iomem *) s;
u16 __iomem *iod = (u16 __iomem *) d;
int s_isio = __is_ioaddr(s);
int d_isio = __is_ioaddr(d);
if (s_isio) {
if (d_isio) {
/* FIXME: Should handle unaligned ops and
operation widening. */
count /= 2;
while (count--) {
u16 tmp = __raw_readw(ios++);
__raw_writew(tmp, iod++);
}
}
else
memcpy_fromio(d, ios, count);
} else {
if (d_isio)
memcpy_toio(iod, s, count);
else
memcpy(d, s, count);
}
}
EXPORT_SYMBOL(scr_memcpyw);
void __iomem *ioport_map(unsigned long port, unsigned int size)
{
return IO_CONCAT(__IO_PREFIX,ioportmap) (port);
}
void ioport_unmap(void __iomem *addr)
{
}
EXPORT_SYMBOL(ioport_map);
EXPORT_SYMBOL(ioport_unmap);
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