arch/xtensa/include/asm/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 #ifdef CONFIG_MMU
  73         if (offset >= XCHAL_KIO_PADDR
  74             && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
  75                 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
  76         else
  77                 BUG();
  78 #else
  79         return (void *)offset;
  80 #endif
  81 }
  82
  83 static inline void *ioremap_nocache(unsigned long offset, unsigned long size)
  84 {
  85 #ifdef CONFIG_MMU
  86         if (offset >= XCHAL_KIO_PADDR
  87             && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
  88                 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
  89         else
  90                 BUG();
  91 #else
  92         return (void *)offset;
  93 #endif
  94 }
  95
  96 static inline void iounmap(void *addr)
  97 {
  98 }
  99
 100 /*
 101  * Generic I/O
 102  */
 103
 104 #define readb(addr) \
 105         ({ unsigned char __v = (*(volatile unsigned char *)(addr)); __v; })
 106 #define readw(addr) \
 107         ({ unsigned short __v = (*(volatile unsigned short *)(addr)); __v; })
 108 #define readl(addr) \
 109         ({ unsigned int __v = (*(volatile unsigned int *)(addr)); __v; })
 110 #define writeb(b, addr) (void)((*(volatile unsigned char *)(addr)) = (b))
 111 #define writew(b, addr) (void)((*(volatile unsigned short *)(addr)) = (b))
 112 #define writel(b, addr) (void)((*(volatile unsigned int *)(addr)) = (b))
 113
 114 static inline __u8 __raw_readb(const volatile void __iomem *addr)
 115 {
 116           return *(__force volatile __u8 *)(addr);
 117 }
 118 static inline __u16 __raw_readw(const volatile void __iomem *addr)
 119 {
 120           return *(__force volatile __u16 *)(addr);
 121 }
 122 static inline __u32 __raw_readl(const volatile void __iomem *addr)
 123 {
 124           return *(__force volatile __u32 *)(addr);
 125 }
 126 static inline void __raw_writeb(__u8 b, volatile void __iomem *addr)
 127 {
 128           *(__force volatile __u8 *)(addr) = b;
 129 }
 130 static inline void __raw_writew(__u16 b, volatile void __iomem *addr)
 131 {
 132           *(__force volatile __u16 *)(addr) = b;
 133 }
 134 static inline void __raw_writel(__u32 b, volatile void __iomem *addr)
 135 {
 136           *(__force volatile __u32 *)(addr) = b;
 137 }
 138
 139 /* These are the definitions for the x86 IO instructions
 140  * inb/inw/inl/outb/outw/outl, the "string" versions
 141  * insb/insw/insl/outsb/outsw/outsl, and the "pausing" versions
 142  * inb_p/inw_p/...
 143  * The macros don't do byte-swapping.
 144  */
 145
 146 #define inb(port)               readb((u8 *)((port)))
 147 #define outb(val, port)         writeb((val),(u8 *)((unsigned long)(port)))
 148 #define inw(port)               readw((u16 *)((port)))
 149 #define outw(val, port)         writew((val),(u16 *)((unsigned long)(port)))
 150 #define inl(port)               readl((u32 *)((port)))
 151 #define outl(val, port)         writel((val),(u32 *)((unsigned long)(port)))
 152
 153 #define inb_p(port)             inb((port))
 154 #define outb_p(val, port)       outb((val), (port))
 155 #define inw_p(port)             inw((port))
 156 #define outw_p(val, port)       outw((val), (port))
 157 #define inl_p(port)             inl((port))
 158 #define outl_p(val, port)       outl((val), (port))
 159
 160 extern void insb (unsigned long port, void *dst, unsigned long count);
 161 extern void insw (unsigned long port, void *dst, unsigned long count);
 162 extern void insl (unsigned long port, void *dst, unsigned long count);
 163 extern void outsb (unsigned long port, const void *src, unsigned long count);
 164 extern void outsw (unsigned long port, const void *src, unsigned long count);
 165 extern void outsl (unsigned long port, const void *src, unsigned long count);
 166
 167 #define IO_SPACE_LIMIT ~0
 168
 169 #define memset_io(a,b,c)       memset((void *)(a),(b),(c))
 170 #define memcpy_fromio(a,b,c)   memcpy((a),(void *)(b),(c))
 171 #define memcpy_toio(a,b,c)      memcpy((void *)(a),(b),(c))
 172
 173 /* At this point the Xtensa doesn't provide byte swap instructions */
 174
 175 #ifdef __XTENSA_EB__
 176 # define in_8(addr) (*(u8*)(addr))
 177 # define in_le16(addr) _swapw(*(u16*)(addr))
 178 # define in_le32(addr) _swapl(*(u32*)(addr))
 179 # define out_8(b, addr) *(u8*)(addr) = (b)
 180 # define out_le16(b, addr) *(u16*)(addr) = _swapw(b)
 181 # define out_le32(b, addr) *(u32*)(addr) = _swapl(b)
 182 #elif defined(__XTENSA_EL__)
 183 # define in_8(addr)  (*(u8*)(addr))
 184 # define in_le16(addr) (*(u16*)(addr))
 185 # define in_le32(addr) (*(u32*)(addr))
 186 # define out_8(b, addr) *(u8*)(addr) = (b)
 187 # define out_le16(b, addr) *(u16*)(addr) = (b)
 188 # define out_le32(b, addr) *(u32*)(addr) = (b)
 189 #else
 190 # error processor byte order undefined!
 191 #endif
 192
 193
 194 /*
 195  * Convert a physical pointer to a virtual kernel pointer for /dev/mem access
 196  */
 197 #define xlate_dev_mem_ptr(p)    __va(p)
 198
 199 /*
 200  * Convert a virtual cached pointer to an uncached pointer
 201  */
 202 #define xlate_dev_kmem_ptr(p)   p
 203
 204
 205 #endif  /* __KERNEL__ */
 206
 207 #endif  /* _XTENSA_IO_H */