1/* 2 * include/asm-xtensa/io.h 3 * 4 * This file is subject to the terms and conditions of the GNU General Public 5 * License. See the file "COPYING" in the main directory of this archive 6 * for more details. 7 * 8 * Copyright (C) 2001 - 2005 Tensilica Inc. 9 */ 10 11#ifndef _XTENSA_IO_H 12#define _XTENSA_IO_H 13 14#ifdef __KERNEL__ 15#include <asm/byteorder.h> 16#include <asm/page.h> 17#include <linux/kernel.h> 18 19#include <linux/types.h> 20 21#define XCHAL_KIO_CACHED_VADDR 0xe0000000 22#define XCHAL_KIO_BYPASS_VADDR 0xf0000000 23#define XCHAL_KIO_PADDR 0xf0000000 24#define XCHAL_KIO_SIZE 0x10000000 25 26#define IOADDR(x) (XCHAL_KIO_BYPASS_VADDR + (x)) 27 28/* 29 * swap functions to change byte order from little-endian to big-endian and 30 * vice versa. 31 */ 32 33static inline unsigned short _swapw (unsigned short v) 34{ 35 return (v << 8) | (v >> 8); 36} 37 38static inline unsigned int _swapl (unsigned int v) 39{ 40 return (v << 24) | ((v & 0xff00) << 8) | ((v >> 8) & 0xff00) | (v >> 24); 41} 42 43/* 44 * Change virtual addresses to physical addresses and vv. 45 * These are trivial on the 1:1 Linux/Xtensa mapping 46 */ 47 48static inline unsigned long virt_to_phys(volatile void * address) 49{ 50 return __pa(address); 51} 52 53static inline void * phys_to_virt(unsigned long address) 54{ 55 return __va(address); 56} 57 58/* 59 * virt_to_bus and bus_to_virt are deprecated. 60 */ 61 62#define virt_to_bus(x) virt_to_phys(x) 63#define bus_to_virt(x) phys_to_virt(x) 64 65/* 66 * Return the virtual (cached) address for the specified bus memory. 67 * Note that we currently don't support any address outside the KIO segment. 68 */ 69 70static inline void *ioremap(unsigned long offset, unsigned long size) 71{ 72#ifdef CONFIG_MMU 73 if (offset >= XCHAL_KIO_PADDR 74 && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE) 75 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR); 76 else 77 BUG(); 78#else 79 return (void *)offset; 80#endif 81} 82 83static inline void *ioremap_nocache(unsigned long offset, unsigned long size) 84{ 85#ifdef CONFIG_MMU 86 if (offset >= XCHAL_KIO_PADDR 87 && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE) 88 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR); 89 else 90 BUG(); 91#else 92 return (void *)offset; 93#endif 94} 95 96static inline void iounmap(void *addr) 97{ 98} 99 100/* 101 * Generic I/O 102 */ 103 104#define readb(addr) \ 105 ({ unsigned char __v = (*(volatile unsigned char *)(addr)); __v; }) 106#define readw(addr) \ 107 ({ unsigned short __v = (*(volatile unsigned short *)(addr)); __v; }) 108#define readl(addr) \ 109 ({ unsigned int __v = (*(volatile unsigned int *)(addr)); __v; }) 110#define writeb(b, addr) (void)((*(volatile unsigned char *)(addr)) = (b)) 111#define writew(b, addr) (void)((*(volatile unsigned short *)(addr)) = (b)) 112#define writel(b, addr) (void)((*(volatile unsigned int *)(addr)) = (b)) 113 114static inline __u8 __raw_readb(const volatile void __iomem *addr) 115{ 116 return *(__force volatile __u8 *)(addr); 117} 118static inline __u16 __raw_readw(const volatile void __iomem *addr) 119{ 120 return *(__force volatile __u16 *)(addr); 121} 122static inline __u32 __raw_readl(const volatile void __iomem *addr) 123{ 124 return *(__force volatile __u32 *)(addr); 125} 126static inline void __raw_writeb(__u8 b, volatile void __iomem *addr) 127{ 128 *(__force volatile __u8 *)(addr) = b; 129} 130static inline void __raw_writew(__u16 b, volatile void __iomem *addr) 131{ 132 *(__force volatile __u16 *)(addr) = b; 133} 134static inline void __raw_writel(__u32 b, volatile void __iomem *addr) 135{ 136 *(__force volatile __u32 *)(addr) = b; 137} 138 139/* These are the definitions for the x86 IO instructions 140 * inb/inw/inl/outb/outw/outl, the "string" versions 141 * insb/insw/insl/outsb/outsw/outsl, and the "pausing" versions 142 * inb_p/inw_p/... 143 * The macros don't do byte-swapping. 144 */ 145 146#define inb(port) readb((u8 *)((port))) 147#define outb(val, port) writeb((val),(u8 *)((unsigned long)(port))) 148#define inw(port) readw((u16 *)((port))) 149#define outw(val, port) writew((val),(u16 *)((unsigned long)(port))) 150#define inl(port) readl((u32 *)((port))) 151#define outl(val, port) writel((val),(u32 *)((unsigned long)(port))) 152 153#define inb_p(port) inb((port)) 154#define outb_p(val, port) outb((val), (port)) 155#define inw_p(port) inw((port)) 156#define outw_p(val, port) outw((val), (port)) 157#define inl_p(port) inl((port)) 158#define outl_p(val, port) outl((val), (port)) 159 160extern void insb (unsigned long port, void *dst, unsigned long count); 161extern void insw (unsigned long port, void *dst, unsigned long count); 162extern void insl (unsigned long port, void *dst, unsigned long count); 163extern void outsb (unsigned long port, const void *src, unsigned long count); 164extern void outsw (unsigned long port, const void *src, unsigned long count); 165extern void outsl (unsigned long port, const void *src, unsigned long count); 166 167#define IO_SPACE_LIMIT ~0 168 169#define memset_io(a,b,c) memset((void *)(a),(b),(c)) 170#define memcpy_fromio(a,b,c) memcpy((a),(void *)(b),(c)) 171#define memcpy_toio(a,b,c) memcpy((void *)(a),(b),(c)) 172 173/* At this point the Xtensa doesn't provide byte swap instructions */ 174 175#ifdef __XTENSA_EB__ 176# define in_8(addr) (*(u8*)(addr)) 177# define in_le16(addr) _swapw(*(u16*)(addr)) 178# define in_le32(addr) _swapl(*(u32*)(addr)) 179# define out_8(b, addr) *(u8*)(addr) = (b) 180# define out_le16(b, addr) *(u16*)(addr) = _swapw(b) 181# define out_le32(b, addr) *(u32*)(addr) = _swapl(b) 182#elif defined(__XTENSA_EL__) 183# define in_8(addr) (*(u8*)(addr)) 184# define in_le16(addr) (*(u16*)(addr)) 185# define in_le32(addr) (*(u32*)(addr)) 186# define out_8(b, addr) *(u8*)(addr) = (b) 187# define out_le16(b, addr) *(u16*)(addr) = (b) 188# define out_le32(b, addr) *(u32*)(addr) = (b) 189#else 190# error processor byte order undefined! 191#endif 192 193 194/* 195 * Convert a physical pointer to a virtual kernel pointer for /dev/mem access 196 */ 197#define xlate_dev_mem_ptr(p) __va(p) 198 199/* 200 * Convert a virtual cached pointer to an uncached pointer 201 */ 202#define xlate_dev_kmem_ptr(p) p 203 204 205#endif /* __KERNEL__ */ 206 207#endif /* _XTENSA_IO_H */ 208