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