/* Generic I/O port emulation, based on MN10300 code
*
* Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#ifndef __ASM_GENERIC_IO_H
#define __ASM_GENERIC_IO_H
#include <asm/page.h> /* I/O is all done through memory accesses */
#include <asm/cacheflush.h>
#include <linux/types.h>
#ifdef CONFIG_GENERIC_IOMAP
#include <asm-generic/iomap.h>
#endif
#define mmiowb() do {} while (0)
/*****************************************************************************/
/*
* readX/writeX() are used to access memory mapped devices. On some
* architectures the memory mapped IO stuff needs to be accessed
* differently. On the simple architectures, we just read/write the
* memory location directly.
*/
static inline u8 __raw_readb(const volatile void __iomem *addr)
{
return *(const volatile u8 __force *) addr;
}
static inline u16 __raw_readw(const volatile void __iomem *addr)
{
return *(const volatile u16 __force *) addr;
}
static inline u32 __raw_readl(const volatile void __iomem *addr)
{
return *(const volatile u32 __force *) addr;
}
#define readb __raw_readb
#define readw(addr) __le16_to_cpu(__raw_readw(addr))
#define readl(addr) __le32_to_cpu(__raw_readl(addr))
static inline void __raw_writeb(u8 b, volatile void __iomem *addr)
{
*(volatile u8 __force *) addr = b;
}
static inline void __raw_writew(u16 b, volatile void __iomem *addr)
{
*(volatile u16 __force *) addr = b;
}
static inline void __raw_writel(u32 b, volatile void __iomem *addr)
{
*(volatile u32 __force *) addr = b;
}
#define writeb __raw_writeb
#define writew(b,addr) __raw_writew(__cpu_to_le16(b),addr)
#define writel(b,addr) __raw_writel(__cpu_to_le32(b),addr)
#ifdef CONFIG_64BIT
static inline u64 __raw_readq(const volatile void __iomem *addr)
{
return *(const volatile u64 __force *) addr;
}
#define readq(addr) __le64_to_cpu(__raw_readq(addr))
static inline void __raw_writeq(u64 b, volatile void __iomem *addr)
{
*(volatile u64 __force *) addr = b;
}
#define writeq(b,addr) __raw_writeq(__cpu_to_le64(b),addr)
#endif
/*****************************************************************************/
/*
* traditional input/output functions
*/
static inline u8 inb(unsigned long addr)
{
return readb((volatile void __iomem *) addr);
}
static inline u16 inw(unsigned long addr)
{
return readw((volatile void __iomem *) addr);
}
static inline u32 inl(unsigned long addr)
{
return readl((volatile void __iomem *) addr);
}
static inline void outb(u8 b, unsigned long addr)
{
writeb(b, (volatile void __iomem *) addr);
}
static inline void outw(u16 b, unsigned long addr)
{
writew(b, (volatile void __iomem *) addr);
}
static inline void outl(u32 b, unsigned long addr)
{
writel(b, (volatile void __iomem *) addr);
}
#define inb_p(addr) inb(addr)
#define inw_p(addr) inw(addr)
#define inl_p(addr) inl(addr)
#define outb_p(x, addr) outb((x), (addr))
#define outw_p(x, addr) outw((x), (addr))
#define outl_p(x, addr) outl((x), (addr))
static inline void insb(unsigned long addr, void *buffer, int count)
{
if (count) {
u8 *buf = buffer;
do {
u8 x = inb(addr);
*buf++ = x;
} while (--count);
}
}
static inline void insw(unsigned long addr, void *buffer, int count)
{
if (count) {
u16 *buf = buffer;
do {
u16 x = inw(addr);
*buf++ = x;
} while (--count);
}
}
static inline void insl(unsigned long addr, void *buffer, int count)
{
if (count) {
u32 *buf = buffer;
do {
u32 x = inl(addr);
*buf++ = x;
} while (--count);
}
}
static inline void outsb(unsigned long addr, const void *buffer, int count)
{
if (count) {
const u8 *buf = buffer;
do {
outb(*buf++, addr);
} while (--count);
}
}
static inline void outsw(unsigned long addr, const void *buffer, int count)
{
if (count) {
const u16 *buf = buffer;
do {
outw(*buf++, addr);
} while (--count);
}
}
static inline void outsl(unsigned long addr, const void *buffer, int count)
{
if (count) {
const u32 *buf = buffer;
do {
outl(*buf++, addr);
} while (--count);
}
}
#ifndef CONFIG_GENERIC_IOMAP
#define ioread8(addr) readb(addr)
#define ioread16(addr) readw(addr)
#define ioread32(addr) readl(addr)
#define iowrite8(v, addr) writeb((v), (addr))
#define iowrite16(v, addr) writew((v), (addr))
#define iowrite32(v, addr) writel((v), (addr))
#define ioread8_rep(p, dst, count) \
insb((unsigned long) (p), (dst), (count))
#define ioread16_rep(p, dst, count) \
insw((unsigned long) (p), (dst), (count))
#define ioread32_rep(p, dst, count) \
insl((unsigned long) (p), (dst), (count))
#define iowrite8_rep(p, src, count) \
outsb((unsigned long) (p), (src), (count))
#define iowrite16_rep(p, src, count) \
outsw((unsigned long) (p), (src), (count))
#define iowrite32_rep(p, src, count) \
outsl((unsigned long) (p), (src), (count))
#endif /* CONFIG_GENERIC_IOMAP */
#define IO_SPACE_LIMIT 0xffffffff
#ifdef __KERNEL__
#include <linux/vmalloc.h>
#define __io_virt(x) ((void __force *) (x))
#ifndef CONFIG_GENERIC_IOMAP
/* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
struct pci_dev;
extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
{
}
#endif /* CONFIG_GENERIC_IOMAP */
/*
* Change virtual addresses to physical addresses and vv.
* These are pretty trivial
*/
static inline unsigned long virt_to_phys(volatile void *address)
{
return __pa((unsigned long)address);
}
static inline void *phys_to_virt(unsigned long address)
{
return __va(address);
}
/*
* Change "struct page" to physical address.
*/
static inline void __iomem *ioremap(phys_addr_t offset, unsigned long size)
{
return (void __iomem*) (unsigned long)offset;
}
#define __ioremap(offset, size, flags) ioremap(offset, size)
#ifndef ioremap_nocache
#define ioremap_nocache ioremap
#endif
#ifndef ioremap_wc
#define ioremap_wc ioremap_nocache
#endif
static inline void iounmap(void *addr)
{
}
#ifndef CONFIG_GENERIC_IOMAP
static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
{
return (void __iomem *) port;
}
static inline void ioport_unmap(void __iomem *p)
{
}
#else /* CONFIG_GENERIC_IOMAP */
extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
extern void ioport_unmap(void __iomem *p);
#endif /* CONFIG_GENERIC_IOMAP */
#define xlate_dev_kmem_ptr(p) p
#define xlate_dev_mem_ptr(p) ((void *) (p))
#ifndef virt_to_bus
static inline unsigned long virt_to_bus(volatile void *address)
{
return ((unsigned long) address);
}
static inline void *bus_to_virt(unsigned long address)
{
return (void *) address;
}
#endif
#define memset_io(a, b, c) memset(__io_virt(a), (b), (c))
#define memcpy_fromio(a, b, c) memcpy((a), __io_virt(b), (c))
#define memcpy_toio(a, b, c) memcpy(__io_virt(a), (b), (c))
#endif /* __KERNEL__ */
#endif /* __ASM_GENERIC_IO_H */
