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 #include <asm/page.h>
  17
  18 #include <linux/types.h>
  19
  20 #define XCHAL_KIO_CACHED_VADDR  0xf0000000
  21 #define XCHAL_KIO_BYPASS_VADDR  0xf8000000
  22 #define XCHAL_KIO_PADDR         0xf0000000
  23 #define XCHAL_KIO_SIZE          0x08000000
  24
  25 /*
  26  * swap functions to change byte order from little-endian to big-endian and
  27  * vice versa.
  28  */
  29
  30 static inline unsigned short _swapw (unsigned short v)
  31 {
  32         return (v << 8) | (v >> 8);
  33 }
  34
  35 static inline unsigned int _swapl (unsigned int v)
  36 {
  37         return (v << 24) | ((v & 0xff00) << 8) | ((v >> 8) & 0xff00) | (v >> 24);
  38 }
  39
  40 /*
  41  * Change virtual addresses to physical addresses and vv.
  42  * These are trivial on the 1:1 Linux/Xtensa mapping
  43  */
  44
  45 static inline unsigned long virt_to_phys(volatile void * address)
  46 {
  47         return __pa(address);
  48 }
  49
  50 static inline void * phys_to_virt(unsigned long address)
  51 {
  52         return __va(address);
  53 }
  54
  55 /*
  56  * virt_to_bus and bus_to_virt are deprecated.
  57  */
  58
  59 #define virt_to_bus(x)  virt_to_phys(x)
  60 #define bus_to_virt(x)  phys_to_virt(x)
  61
  62 /*
  63  * Return the virtual (cached) address for the specified bus memory.
  64  * Note that we currently don't support any address outside the KIO segment.
  65  */
  66
  67 static inline void *ioremap(unsigned long offset, unsigned long size)
  68 {
  69         if (offset >= XCHAL_KIO_PADDR
  70             && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
  71                 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
  72
  73         else
  74                 BUG();
  75 }
  76
  77 static inline void *ioremap_nocache(unsigned long offset, unsigned long size)
  78 {
  79         if (offset >= XCHAL_KIO_PADDR
  80             && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
  81                 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
  82         else
  83                 BUG();
  84 }
  85
  86 static inline void iounmap(void *addr)
  87 {
  88 }
  89
  90 /*
  91  * Generic I/O
  92  */
  93
  94 #define readb(addr) \
  95         ({ unsigned char __v = (*(volatile unsigned char *)(addr)); __v; })
  96 #define readw(addr) \
  97         ({ unsigned short __v = (*(volatile unsigned short *)(addr)); __v; })
  98 #define readl(addr) \
  99         ({ unsigned int __v = (*(volatile unsigned int *)(addr)); __v; })
 100 #define writeb(b, addr) (void)((*(volatile unsigned char *)(addr)) = (b))
 101 #define writew(b, addr) (void)((*(volatile unsigned short *)(addr)) = (b))
 102 #define writel(b, addr) (void)((*(volatile unsigned int *)(addr)) = (b))
 103
 104 static inline __u8 __raw_readb(const volatile void __iomem *addr)
 105 {
 106           return *(__force volatile __u8 *)(addr);
 107 }
 108 static inline __u16 __raw_readw(const volatile void __iomem *addr)
 109 {
 110           return *(__force volatile __u16 *)(addr);
 111 }
 112 static inline __u32 __raw_readl(const volatile void __iomem *addr)
 113 {
 114           return *(__force volatile __u32 *)(addr);
 115 }
 116 static inline void __raw_writeb(__u8 b, volatile void __iomem *addr)
 117 {
 118           *(__force volatile __u8 *)(addr) = b;
 119 }
 120 static inline void __raw_writew(__u16 b, volatile void __iomem *addr)
 121 {
 122           *(__force volatile __u16 *)(addr) = b;
 123 }
 124 static inline void __raw_writel(__u32 b, volatile void __iomem *addr)
 125 {
 126           *(__force volatile __u32 *)(addr) = b;
 127 }
 128
 129 /* These are the definitions for the x86 IO instructions
 130  * inb/inw/inl/outb/outw/outl, the "string" versions
 131  * insb/insw/insl/outsb/outsw/outsl, and the "pausing" versions
 132  * inb_p/inw_p/...
 133  * The macros don't do byte-swapping.
 134  */
 135
 136 #define inb(port)               readb((u8 *)((port)))
 137 #define outb(val, port)         writeb((val),(u8 *)((unsigned long)(port)))
 138 #define inw(port)               readw((u16 *)((port)))
 139 #define outw(val, port)         writew((val),(u16 *)((unsigned long)(port)))
 140 #define inl(port)               readl((u32 *)((port)))
 141 #define outl(val, port)         writel((val),(u32 *)((unsigned long)(port)))
 142
 143 #define inb_p(port)             inb((port))
 144 #define outb_p(val, port)       outb((val), (port))
 145 #define inw_p(port)             inw((port))
 146 #define outw_p(val, port)       outw((val), (port))
 147 #define inl_p(port)             inl((port))
 148 #define outl_p(val, port)       outl((val), (port))
 149
 150 extern void insb (unsigned long port, void *dst, unsigned long count);
 151 extern void insw (unsigned long port, void *dst, unsigned long count);
 152 extern void insl (unsigned long port, void *dst, unsigned long count);
 153 extern void outsb (unsigned long port, const void *src, unsigned long count);
 154 extern void outsw (unsigned long port, const void *src, unsigned long count);
 155 extern void outsl (unsigned long port, const void *src, unsigned long count);
 156
 157 #define IO_SPACE_LIMIT ~0
 158
 159 #define memset_io(a,b,c)       memset((void *)(a),(b),(c))
 160 #define memcpy_fromio(a,b,c)   memcpy((a),(void *)(b),(c))
 161 #define memcpy_toio(a,b,c)      memcpy((void *)(a),(b),(c))
 162
 163 /* At this point the Xtensa doesn't provide byte swap instructions */
 164
 165 #ifdef __XTENSA_EB__
 166 # define in_8(addr) (*(u8*)(addr))
 167 # define in_le16(addr) _swapw(*(u16*)(addr))
 168 # define in_le32(addr) _swapl(*(u32*)(addr))
 169 # define out_8(b, addr) *(u8*)(addr) = (b)
 170 # define out_le16(b, addr) *(u16*)(addr) = _swapw(b)
 171 # define out_le32(b, addr) *(u32*)(addr) = _swapl(b)
 172 #elif defined(__XTENSA_EL__)
 173 # define in_8(addr)  (*(u8*)(addr))
 174 # define in_le16(addr) (*(u16*)(addr))
 175 # define in_le32(addr) (*(u32*)(addr))
 176 # define out_8(b, addr) *(u8*)(addr) = (b)
 177 # define out_le16(b, addr) *(u16*)(addr) = (b)
 178 # define out_le32(b, addr) *(u32*)(addr) = (b)
 179 #else
 180 # error processor byte order undefined!
 181 #endif
 182
 183
 184 /*
 185  * Convert a physical pointer to a virtual kernel pointer for /dev/mem 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 */