include/asm-xtensa/io.h

   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
  17 #include <linux/types.h>
  18
  19 #define XCHAL_KIO_CACHED_VADDR  0xf0000000
  20 #define XCHAL_KIO_BYPASS_VADDR  0xf8000000
  21 #define XCHAL_KIO_PADDR         0xf0000000
  22 #define XCHAL_KIO_SIZE          0x08000000
  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 static inline unsigned long virt_to_phys(volatile void * address)
  45 {
  46         return __pa(address);
  47 }
  48
  49 static inline void * phys_to_virt(unsigned long address)
  50 {
  51         return __va(address);
  52 }
  53
  54 /*
  55  * virt_to_bus and bus_to_virt are deprecated.
  56  */
  57
  58 #define virt_to_bus(x)  virt_to_phys(x)
  59 #define bus_to_virt(x)  phys_to_virt(x)
  60
  61 /*
  62  * Return the virtual (cached) address for the specified bus memory.
  63  * Note that we currently don't support any address outside the KIO segment.
  64  */
  65
  66 static inline void *ioremap(unsigned long offset, unsigned long size)
  67 {
  68         if (offset >= XCHAL_KIO_PADDR
  69             && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
  70                 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
  71
  72         else
  73                 BUG();
  74 }
  75
  76 static inline void *ioremap_nocache(unsigned long offset, unsigned long size)
  77 {
  78         if (offset >= XCHAL_KIO_PADDR
  79             && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
  80                 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
  81         else
  82                 BUG();
  83 }
  84
  85 static inline void iounmap(void *addr)
  86 {
  87 }
  88
  89 /*
  90  * Generic I/O
  91  */
  92
  93 #define readb(addr) \
  94         ({ unsigned char __v = (*(volatile unsigned char *)(addr)); __v; })
  95 #define readw(addr) \
  96         ({ unsigned short __v = (*(volatile unsigned short *)(addr)); __v; })
  97 #define readl(addr) \
  98         ({ unsigned int __v = (*(volatile unsigned int *)(addr)); __v; })
  99 #define writeb(b, addr) (void)((*(volatile unsigned char *)(addr)) = (b))
 100 #define writew(b, addr) (void)((*(volatile unsigned short *)(addr)) = (b))
 101 #define writel(b, addr) (void)((*(volatile unsigned int *)(addr)) = (b))
 102
 103 static inline __u8 __raw_readb(const volatile void __iomem *addr)
 104 {
 105           return *(__force volatile __u8 *)(addr);
 106 }
 107 static inline __u16 __raw_readw(const volatile void __iomem *addr)
 108 {
 109           return *(__force volatile __u16 *)(addr);
 110 }
 111 static inline __u32 __raw_readl(const volatile void __iomem *addr)
 112 {
 113           return *(__force volatile __u32 *)(addr);
 114 }
 115 static inline void __raw_writeb(__u8 b, volatile void __iomem *addr)
 116 {
 117           *(__force volatile __u8 *)(addr) = b;
 118 }
 119 static inline void __raw_writew(__u16 b, volatile void __iomem *addr)
 120 {
 121           *(__force volatile __u16 *)(addr) = b;
 122 }
 123 static inline void __raw_writel(__u32 b, volatile void __iomem *addr)
 124 {
 125           *(__force volatile __u32 *)(addr) = b;
 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)))
 136 #define outb(val, port)         writeb((val),(u8 *)((unsigned long)(port)))
 137 #define inw(port)               readw((u16 *)((port)))
 138 #define outw(val, port)         writew((val),(u16 *)((unsigned long)(port)))
 139 #define inl(port)               readl((u32 *)((port)))
 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 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 */