You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
232 lines
6.2 KiB
232 lines
6.2 KiB
/*
|
|
* Implement the default iomap interfaces
|
|
*
|
|
* (C) Copyright 2004 Linus Torvalds
|
|
*/
|
|
#include <linux/pci.h>
|
|
#include <linux/module.h>
|
|
#include <asm/io.h>
|
|
|
|
/*
|
|
* Read/write from/to an (offsettable) iomem cookie. It might be a PIO
|
|
* access or a MMIO access, these functions don't care. The info is
|
|
* encoded in the hardware mapping set up by the mapping functions
|
|
* (or the cookie itself, depending on implementation and hw).
|
|
*
|
|
* The generic routines don't assume any hardware mappings, and just
|
|
* encode the PIO/MMIO as part of the cookie. They coldly assume that
|
|
* the MMIO IO mappings are not in the low address range.
|
|
*
|
|
* Architectures for which this is not true can't use this generic
|
|
* implementation and should do their own copy.
|
|
*/
|
|
|
|
#ifndef HAVE_ARCH_PIO_SIZE
|
|
/*
|
|
* We encode the physical PIO addresses (0-0xffff) into the
|
|
* pointer by offsetting them with a constant (0x10000) and
|
|
* assuming that all the low addresses are always PIO. That means
|
|
* we can do some sanity checks on the low bits, and don't
|
|
* need to just take things for granted.
|
|
*/
|
|
#define PIO_OFFSET 0x10000UL
|
|
#define PIO_MASK 0x0ffffUL
|
|
#define PIO_RESERVED 0x40000UL
|
|
#endif
|
|
|
|
/*
|
|
* Ugly macros are a way of life.
|
|
*/
|
|
#define VERIFY_PIO(port) BUG_ON((port & ~PIO_MASK) != PIO_OFFSET)
|
|
|
|
#define IO_COND(addr, is_pio, is_mmio) do { \
|
|
unsigned long port = (unsigned long __force)addr; \
|
|
if (port < PIO_RESERVED) { \
|
|
VERIFY_PIO(port); \
|
|
port &= PIO_MASK; \
|
|
is_pio; \
|
|
} else { \
|
|
is_mmio; \
|
|
} \
|
|
} while (0)
|
|
|
|
unsigned int fastcall ioread8(void __iomem *addr)
|
|
{
|
|
IO_COND(addr, return inb(port), return readb(addr));
|
|
}
|
|
unsigned int fastcall ioread16(void __iomem *addr)
|
|
{
|
|
IO_COND(addr, return inw(port), return readw(addr));
|
|
}
|
|
unsigned int fastcall ioread16be(void __iomem *addr)
|
|
{
|
|
IO_COND(addr, return inw(port), return be16_to_cpu(__raw_readw(addr)));
|
|
}
|
|
unsigned int fastcall ioread32(void __iomem *addr)
|
|
{
|
|
IO_COND(addr, return inl(port), return readl(addr));
|
|
}
|
|
unsigned int fastcall ioread32be(void __iomem *addr)
|
|
{
|
|
IO_COND(addr, return inl(port), return be32_to_cpu(__raw_readl(addr)));
|
|
}
|
|
EXPORT_SYMBOL(ioread8);
|
|
EXPORT_SYMBOL(ioread16);
|
|
EXPORT_SYMBOL(ioread16be);
|
|
EXPORT_SYMBOL(ioread32);
|
|
EXPORT_SYMBOL(ioread32be);
|
|
|
|
void fastcall iowrite8(u8 val, void __iomem *addr)
|
|
{
|
|
IO_COND(addr, outb(val,port), writeb(val, addr));
|
|
}
|
|
void fastcall iowrite16(u16 val, void __iomem *addr)
|
|
{
|
|
IO_COND(addr, outw(val,port), writew(val, addr));
|
|
}
|
|
void fastcall iowrite16be(u16 val, void __iomem *addr)
|
|
{
|
|
IO_COND(addr, outw(val,port), __raw_writew(cpu_to_be16(val), addr));
|
|
}
|
|
void fastcall iowrite32(u32 val, void __iomem *addr)
|
|
{
|
|
IO_COND(addr, outl(val,port), writel(val, addr));
|
|
}
|
|
void fastcall iowrite32be(u32 val, void __iomem *addr)
|
|
{
|
|
IO_COND(addr, outl(val,port), __raw_writel(cpu_to_be32(val), addr));
|
|
}
|
|
EXPORT_SYMBOL(iowrite8);
|
|
EXPORT_SYMBOL(iowrite16);
|
|
EXPORT_SYMBOL(iowrite16be);
|
|
EXPORT_SYMBOL(iowrite32);
|
|
EXPORT_SYMBOL(iowrite32be);
|
|
|
|
/*
|
|
* These are the "repeat MMIO read/write" functions.
|
|
* Note the "__raw" accesses, since we don't want to
|
|
* convert to CPU byte order. We write in "IO byte
|
|
* order" (we also don't have IO barriers).
|
|
*/
|
|
static inline void mmio_insb(void __iomem *addr, u8 *dst, int count)
|
|
{
|
|
while (--count >= 0) {
|
|
u8 data = __raw_readb(addr);
|
|
*dst = data;
|
|
dst++;
|
|
}
|
|
}
|
|
static inline void mmio_insw(void __iomem *addr, u16 *dst, int count)
|
|
{
|
|
while (--count >= 0) {
|
|
u16 data = __raw_readw(addr);
|
|
*dst = data;
|
|
dst++;
|
|
}
|
|
}
|
|
static inline void mmio_insl(void __iomem *addr, u32 *dst, int count)
|
|
{
|
|
while (--count >= 0) {
|
|
u32 data = __raw_readl(addr);
|
|
*dst = data;
|
|
dst++;
|
|
}
|
|
}
|
|
|
|
static inline void mmio_outsb(void __iomem *addr, const u8 *src, int count)
|
|
{
|
|
while (--count >= 0) {
|
|
__raw_writeb(*src, addr);
|
|
src++;
|
|
}
|
|
}
|
|
static inline void mmio_outsw(void __iomem *addr, const u16 *src, int count)
|
|
{
|
|
while (--count >= 0) {
|
|
__raw_writew(*src, addr);
|
|
src++;
|
|
}
|
|
}
|
|
static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count)
|
|
{
|
|
while (--count >= 0) {
|
|
__raw_writel(*src, addr);
|
|
src++;
|
|
}
|
|
}
|
|
|
|
void fastcall ioread8_rep(void __iomem *addr, void *dst, unsigned long count)
|
|
{
|
|
IO_COND(addr, insb(port,dst,count), mmio_insb(addr, dst, count));
|
|
}
|
|
void fastcall ioread16_rep(void __iomem *addr, void *dst, unsigned long count)
|
|
{
|
|
IO_COND(addr, insw(port,dst,count), mmio_insw(addr, dst, count));
|
|
}
|
|
void fastcall ioread32_rep(void __iomem *addr, void *dst, unsigned long count)
|
|
{
|
|
IO_COND(addr, insl(port,dst,count), mmio_insl(addr, dst, count));
|
|
}
|
|
EXPORT_SYMBOL(ioread8_rep);
|
|
EXPORT_SYMBOL(ioread16_rep);
|
|
EXPORT_SYMBOL(ioread32_rep);
|
|
|
|
void fastcall iowrite8_rep(void __iomem *addr, const void *src, unsigned long count)
|
|
{
|
|
IO_COND(addr, outsb(port, src, count), mmio_outsb(addr, src, count));
|
|
}
|
|
void fastcall iowrite16_rep(void __iomem *addr, const void *src, unsigned long count)
|
|
{
|
|
IO_COND(addr, outsw(port, src, count), mmio_outsw(addr, src, count));
|
|
}
|
|
void fastcall iowrite32_rep(void __iomem *addr, const void *src, unsigned long count)
|
|
{
|
|
IO_COND(addr, outsl(port, src,count), mmio_outsl(addr, src, count));
|
|
}
|
|
EXPORT_SYMBOL(iowrite8_rep);
|
|
EXPORT_SYMBOL(iowrite16_rep);
|
|
EXPORT_SYMBOL(iowrite32_rep);
|
|
|
|
/* Create a virtual mapping cookie for an IO port range */
|
|
void __iomem *ioport_map(unsigned long port, unsigned int nr)
|
|
{
|
|
if (port > PIO_MASK)
|
|
return NULL;
|
|
return (void __iomem *) (unsigned long) (port + PIO_OFFSET);
|
|
}
|
|
|
|
void ioport_unmap(void __iomem *addr)
|
|
{
|
|
/* Nothing to do */
|
|
}
|
|
EXPORT_SYMBOL(ioport_map);
|
|
EXPORT_SYMBOL(ioport_unmap);
|
|
|
|
/* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
|
|
void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
|
|
{
|
|
unsigned long start = pci_resource_start(dev, bar);
|
|
unsigned long len = pci_resource_len(dev, bar);
|
|
unsigned long flags = pci_resource_flags(dev, bar);
|
|
|
|
if (!len || !start)
|
|
return NULL;
|
|
if (maxlen && len > maxlen)
|
|
len = maxlen;
|
|
if (flags & IORESOURCE_IO)
|
|
return ioport_map(start, len);
|
|
if (flags & IORESOURCE_MEM) {
|
|
if (flags & IORESOURCE_CACHEABLE)
|
|
return ioremap(start, len);
|
|
return ioremap_nocache(start, len);
|
|
}
|
|
/* What? */
|
|
return NULL;
|
|
}
|
|
|
|
void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
|
|
{
|
|
IO_COND(addr, /* nothing */, iounmap(addr));
|
|
}
|
|
EXPORT_SYMBOL(pci_iomap);
|
|
EXPORT_SYMBOL(pci_iounmap);
|
|
|