forked from Minki/linux
065834ab39
A number of new drivers require io{read,write}{8,16,32}{be,} family of io
operations. These are provided for the AVR32 by this patch in the form of
a series of macros.
Access to the (memory mapped) io space through these macros is defined to
be little endian only as little endian devices (such as PCI) are the main
consumer of IO access. If high speed access is required,
io{read,write}{16,32}be macros are supplied to perform native big endian
access to this io space.
Signed-off-by: Ben Nizette <ben@mallochdigital.com>
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
287 lines
7.9 KiB
C
287 lines
7.9 KiB
C
#ifndef __ASM_AVR32_IO_H
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#define __ASM_AVR32_IO_H
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#include <linux/string.h>
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#ifdef __KERNEL__
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#include <asm/addrspace.h>
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#include <asm/byteorder.h>
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/* virt_to_phys will only work when address is in P1 or P2 */
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static __inline__ unsigned long virt_to_phys(volatile void *address)
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{
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return PHYSADDR(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 (void *)P1SEGADDR(address);
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}
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#define cached_to_phys(addr) ((unsigned long)PHYSADDR(addr))
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#define uncached_to_phys(addr) ((unsigned long)PHYSADDR(addr))
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#define phys_to_cached(addr) ((void *)P1SEGADDR(addr))
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#define phys_to_uncached(addr) ((void *)P2SEGADDR(addr))
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/*
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* Generic IO read/write. These perform native-endian accesses. Note
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* that some architectures will want to re-define __raw_{read,write}w.
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*/
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extern void __raw_writesb(unsigned int addr, const void *data, int bytelen);
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extern void __raw_writesw(unsigned int addr, const void *data, int wordlen);
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extern void __raw_writesl(unsigned int addr, const void *data, int longlen);
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extern void __raw_readsb(unsigned int addr, void *data, int bytelen);
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extern void __raw_readsw(unsigned int addr, void *data, int wordlen);
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extern void __raw_readsl(unsigned int addr, void *data, int longlen);
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static inline void writeb(unsigned char b, volatile void __iomem *addr)
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{
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*(volatile unsigned char __force *)addr = b;
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}
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static inline void writew(unsigned short b, volatile void __iomem *addr)
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{
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*(volatile unsigned short __force *)addr = b;
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}
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static inline void writel(unsigned int b, volatile void __iomem *addr)
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{
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*(volatile unsigned int __force *)addr = b;
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}
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#define __raw_writeb writeb
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#define __raw_writew writew
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#define __raw_writel writel
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static inline unsigned char readb(const volatile void __iomem *addr)
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{
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return *(const volatile unsigned char __force *)addr;
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}
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static inline unsigned short readw(const volatile void __iomem *addr)
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{
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return *(const volatile unsigned short __force *)addr;
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}
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static inline unsigned int readl(const volatile void __iomem *addr)
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{
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return *(const volatile unsigned int __force *)addr;
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}
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#define __raw_readb readb
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#define __raw_readw readw
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#define __raw_readl readl
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#define writesb(p, d, l) __raw_writesb((unsigned int)p, d, l)
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#define writesw(p, d, l) __raw_writesw((unsigned int)p, d, l)
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#define writesl(p, d, l) __raw_writesl((unsigned int)p, d, l)
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#define readsb(p, d, l) __raw_readsb((unsigned int)p, d, l)
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#define readsw(p, d, l) __raw_readsw((unsigned int)p, d, l)
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#define readsl(p, d, l) __raw_readsl((unsigned int)p, d, l)
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/*
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* io{read,write}{8,16,32} macros in both le (for PCI style consumers) and native be
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*/
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#ifndef ioread8
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#define ioread8(p) ({ unsigned int __v = __raw_readb(p); __v; })
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#define ioread16(p) ({ unsigned int __v = le16_to_cpu(__raw_readw(p)); __v; })
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#define ioread16be(p) ({ unsigned int __v = be16_to_cpu(__raw_readw(p)); __v; })
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#define ioread32(p) ({ unsigned int __v = le32_to_cpu(__raw_readl(p)); __v; })
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#define ioread32be(p) ({ unsigned int __v = be32_to_cpu(__raw_readl(p)); __v; })
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#define iowrite8(v,p) __raw_writeb(v, p)
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#define iowrite16(v,p) __raw_writew(cpu_to_le16(v), p)
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#define iowrite16be(v,p) __raw_writew(cpu_to_be16(v), p)
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#define iowrite32(v,p) __raw_writel(cpu_to_le32(v), p)
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#define iowrite32be(v,p) __raw_writel(cpu_to_be32(v), p)
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#define ioread8_rep(p,d,c) __raw_readsb(p,d,c)
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#define ioread16_rep(p,d,c) __raw_readsw(p,d,c)
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#define ioread32_rep(p,d,c) __raw_readsl(p,d,c)
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#define iowrite8_rep(p,s,c) __raw_writesb(p,s,c)
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#define iowrite16_rep(p,s,c) __raw_writesw(p,s,c)
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#define iowrite32_rep(p,s,c) __raw_writesl(p,s,c)
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#endif
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/*
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* These two are only here because ALSA _thinks_ it needs them...
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*/
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static inline void memcpy_fromio(void * to, const volatile void __iomem *from,
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unsigned long count)
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{
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char *p = to;
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while (count) {
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count--;
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*p = readb(from);
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p++;
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from++;
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}
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}
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static inline void memcpy_toio(volatile void __iomem *to, const void * from,
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unsigned long count)
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{
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const char *p = from;
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while (count) {
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count--;
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writeb(*p, to);
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p++;
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to++;
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}
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}
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static inline void memset_io(volatile void __iomem *addr, unsigned char val,
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unsigned long count)
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{
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memset((void __force *)addr, val, count);
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}
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/*
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* Bad read/write accesses...
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*/
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extern void __readwrite_bug(const char *fn);
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#define IO_SPACE_LIMIT 0xffffffff
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/* Convert I/O port address to virtual address */
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#define __io(p) ((void __iomem *)phys_to_uncached(p))
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/*
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* IO port access primitives
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* -------------------------
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*
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* The AVR32 doesn't have special IO access instructions; all IO is memory
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* mapped. Note that these are defined to perform little endian accesses
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* only. Their primary purpose is to access PCI and ISA peripherals.
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*
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* Note that for a big endian machine, this implies that the following
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* big endian mode connectivity is in place.
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*
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* The machine specific io.h include defines __io to translate an "IO"
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* address to a memory address.
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*
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* Note that we prevent GCC re-ordering or caching values in expressions
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* by introducing sequence points into the in*() definitions. Note that
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* __raw_* do not guarantee this behaviour.
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*
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* The {in,out}[bwl] macros are for emulating x86-style PCI/ISA IO space.
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*/
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#define outb(v, p) __raw_writeb(v, __io(p))
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#define outw(v, p) __raw_writew(cpu_to_le16(v), __io(p))
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#define outl(v, p) __raw_writel(cpu_to_le32(v), __io(p))
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#define inb(p) __raw_readb(__io(p))
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#define inw(p) le16_to_cpu(__raw_readw(__io(p)))
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#define inl(p) le32_to_cpu(__raw_readl(__io(p)))
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static inline void __outsb(unsigned long port, void *addr, unsigned int count)
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{
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while (count--) {
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outb(*(u8 *)addr, port);
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addr++;
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}
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}
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static inline void __insb(unsigned long port, void *addr, unsigned int count)
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{
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while (count--) {
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*(u8 *)addr = inb(port);
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addr++;
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}
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}
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static inline void __outsw(unsigned long port, void *addr, unsigned int count)
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{
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while (count--) {
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outw(*(u16 *)addr, port);
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addr += 2;
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}
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}
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static inline void __insw(unsigned long port, void *addr, unsigned int count)
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{
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while (count--) {
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*(u16 *)addr = inw(port);
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addr += 2;
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}
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}
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static inline void __outsl(unsigned long port, void *addr, unsigned int count)
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{
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while (count--) {
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outl(*(u32 *)addr, port);
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addr += 4;
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}
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}
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static inline void __insl(unsigned long port, void *addr, unsigned int count)
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{
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while (count--) {
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*(u32 *)addr = inl(port);
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addr += 4;
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}
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}
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#define outsb(port, addr, count) __outsb(port, addr, count)
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#define insb(port, addr, count) __insb(port, addr, count)
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#define outsw(port, addr, count) __outsw(port, addr, count)
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#define insw(port, addr, count) __insw(port, addr, count)
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#define outsl(port, addr, count) __outsl(port, addr, count)
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#define insl(port, addr, count) __insl(port, addr, count)
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extern void __iomem *__ioremap(unsigned long offset, size_t size,
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unsigned long flags);
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extern void __iounmap(void __iomem *addr);
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/*
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* ioremap - map bus memory into CPU space
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* @offset bus address of the memory
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* @size size of the resource to map
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*
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* ioremap performs a platform specific sequence of operations to make
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* bus memory CPU accessible via the readb/.../writel functions and
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* the other mmio helpers. The returned address is not guaranteed to
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* be usable directly as a virtual address.
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*/
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#define ioremap(offset, size) \
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__ioremap((offset), (size), 0)
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#define iounmap(addr) \
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__iounmap(addr)
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#define cached(addr) P1SEGADDR(addr)
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#define uncached(addr) P2SEGADDR(addr)
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#define virt_to_bus virt_to_phys
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#define bus_to_virt phys_to_virt
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#define page_to_bus page_to_phys
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#define bus_to_page phys_to_page
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#define dma_cache_wback_inv(_start, _size) \
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flush_dcache_region(_start, _size)
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#define dma_cache_inv(_start, _size) \
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invalidate_dcache_region(_start, _size)
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#define dma_cache_wback(_start, _size) \
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clean_dcache_region(_start, _size)
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/*
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* Convert a physical pointer to a virtual kernel pointer for /dev/mem
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* access
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*/
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#define xlate_dev_mem_ptr(p) __va(p)
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/*
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* Convert a virtual cached pointer to an uncached pointer
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*/
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#define xlate_dev_kmem_ptr(p) p
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#endif /* __KERNEL__ */
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#endif /* __ASM_AVR32_IO_H */
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