include/asm-xtensa/io.h

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