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