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 #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
  33 static inline unsigned short _swapw (unsigned short v)
  34 {
  35         return (v << 8) | (v >> 8);
  36 }
  37
  38 static 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
  48 static inline unsigned long virt_to_phys(volatile void * address)
  49 {
  50         return __pa(address);
  51 }
  52
  53 static 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
  70 static inline void *ioremap(unsigned long offset, unsigned long size)
  71 {
  72         if (offset >= XCHAL_KIO_PADDR
  73             && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
  74                 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
  75
  76         else
  77                 BUG();
  78 }
  79
  80 static inline void *ioremap_nocache(unsigned long offset, unsigned long size)
  81 {
  82         if (offset >= XCHAL_KIO_PADDR
  83             && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
  84                 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
  85         else
  86                 BUG();
  87 }
  88
  89 static inline void iounmap(void *addr)
  90 {
  91 }
  92
  93 /*
  94  * Generic I/O
  95  */
  96
  97 #define readb(addr) \
  98         ({ unsigned char __v = (*(volatile unsigned char *)(addr)); __v; })
  99 #define readw(addr) \
 100         ({ unsigned short __v = (*(volatile unsigned short *)(addr)); __v; })
 101 #define readl(addr) \
 102         ({ unsigned int __v = (*(volatile unsigned int *)(addr)); __v; })
 103 #define writeb(b, addr) (void)((*(volatile unsigned char *)(addr)) = (b))
 104 #define writew(b, addr) (void)((*(volatile unsigned short *)(addr)) = (b))
 105 #define writel(b, addr) (void)((*(volatile unsigned int *)(addr)) = (b))
 106
 107 static inline __u8 __raw_readb(const volatile void __iomem *addr)
 108 {
 109           return *(__force volatile __u8 *)(addr);
 110 }
 111 static inline __u16 __raw_readw(const volatile void __iomem *addr)
 112 {
 113           return *(__force volatile __u16 *)(addr);
 114 }
 115 static inline __u32 __raw_readl(const volatile void __iomem *addr)
 116 {
 117           return *(__force volatile __u32 *)(addr);
 118 }
 119 static inline void __raw_writeb(__u8 b, volatile void __iomem *addr)
 120 {
 121           *(__force volatile __u8 *)(addr) = b;
 122 }
 123 static inline void __raw_writew(__u16 b, volatile void __iomem *addr)
 124 {
 125           *(__force volatile __u16 *)(addr) = b;
 126 }
 127 static inline void __raw_writel(__u32 b, volatile void __iomem *addr)
 128 {
 129           *(__force volatile __u32 *)(addr) = b;
 130 }
 131
 132 /* These are the definitions for the x86 IO instructions
 133  * inb/inw/inl/outb/outw/outl, the "string" versions
 134  * insb/insw/insl/outsb/outsw/outsl, and the "pausing" versions
 135  * inb_p/inw_p/...
 136  * The macros don't do byte-swapping.
 137  */
 138
 139 #define inb(port)               readb((u8 *)((port)))
 140 #define outb(val, port)         writeb((val),(u8 *)((unsigned long)(port)))
 141 #define inw(port)               readw((u16 *)((port)))
 142 #define outw(val, port)         writew((val),(u16 *)((unsigned long)(port)))
 143 #define inl(port)               readl((u32 *)((port)))
 144 #define outl(val, port)         writel((val),(u32 *)((unsigned long)(port)))
 145
 146 #define inb_p(port)             inb((port))
 147 #define outb_p(val, port)       outb((val), (port))
 148 #define inw_p(port)             inw((port))
 149 #define outw_p(val, port)       outw((val), (port))
 150 #define inl_p(port)             inl((port))
 151 #define outl_p(val, port)       outl((val), (port))
 152
 153 extern void insb (unsigned long port, void *dst, unsigned long count);
 154 extern void insw (unsigned long port, void *dst, unsigned long count);
 155 extern void insl (unsigned long port, void *dst, unsigned long count);
 156 extern void outsb (unsigned long port, const void *src, unsigned long count);
 157 extern void outsw (unsigned long port, const void *src, unsigned long count);
 158 extern void outsl (unsigned long port, const void *src, unsigned long count);
 159
 160 #define IO_SPACE_LIMIT ~0
 161
 162 #define memset_io(a,b,c)       memset((void *)(a),(b),(c))
 163 #define memcpy_fromio(a,b,c)   memcpy((a),(void *)(b),(c))
 164 #define memcpy_toio(a,b,c)      memcpy((void *)(a),(b),(c))
 165
 166 /* At this point the Xtensa doesn't provide byte swap instructions */
 167
 168 #ifdef __XTENSA_EB__
 169 # define in_8(addr) (*(u8*)(addr))
 170 # define in_le16(addr) _swapw(*(u16*)(addr))
 171 # define in_le32(addr) _swapl(*(u32*)(addr))
 172 # define out_8(b, addr) *(u8*)(addr) = (b)
 173 # define out_le16(b, addr) *(u16*)(addr) = _swapw(b)
 174 # define out_le32(b, addr) *(u32*)(addr) = _swapl(b)
 175 #elif defined(__XTENSA_EL__)
 176 # define in_8(addr)  (*(u8*)(addr))
 177 # define in_le16(addr) (*(u16*)(addr))
 178 # define in_le32(addr) (*(u32*)(addr))
 179 # define out_8(b, addr) *(u8*)(addr) = (b)
 180 # define out_le16(b, addr) *(u16*)(addr) = (b)
 181 # define out_le32(b, addr) *(u32*)(addr) = (b)
 182 #else
 183 # error processor byte order undefined!
 184 #endif
 185
 186
 187 /*
 188  * Convert a physical pointer to a virtual kernel pointer for /dev/mem access
 189  */
 190 #define xlate_dev_mem_ptr(p)    __va(p)
 191
 192 /*
 193  * Convert a virtual cached pointer to an uncached pointer
 194  */
 195 #define xlate_dev_kmem_ptr(p)   p
 196
 197
 198 #endif  /* __KERNEL__ */
 199
 200 #endif  /* _XTENSA_IO_H */