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  0xf0000000
  22 #define XCHAL_KIO_BYPASS_VADDR  0xf8000000
  23 #define XCHAL_KIO_PADDR         0xf0000000
  24 #define XCHAL_KIO_SIZE          0x08000000
  25
  26 /*
  27  * swap functions to change byte order from little-endian to big-endian and
  28  * vice versa.
  29  */
  30
  31 static inline unsigned short _swapw (unsigned short v)
  32 {
  33         return (v << 8) | (v >> 8);
  34 }
  35
  36 static inline unsigned int _swapl (unsigned int v)
  37 {
  38         return (v << 24) | ((v & 0xff00) << 8) | ((v >> 8) & 0xff00) | (v >> 24);
  39 }
  40
  41 /*
  42  * Change virtual addresses to physical addresses and vv.
  43  * These are trivial on the 1:1 Linux/Xtensa mapping
  44  */
  45
  46 static inline unsigned long virt_to_phys(volatile void * address)
  47 {
  48         return __pa(address);
  49 }
  50
  51 static inline void * phys_to_virt(unsigned long address)
  52 {
  53         return __va(address);
  54 }
  55
  56 /*
  57  * virt_to_bus and bus_to_virt are deprecated.
  58  */
  59
  60 #define virt_to_bus(x)  virt_to_phys(x)
  61 #define bus_to_virt(x)  phys_to_virt(x)
  62
  63 /*
  64  * Return the virtual (cached) address for the specified bus memory.
  65  * Note that we currently don't support any address outside the KIO segment.
  66  */
  67
  68 static inline void *ioremap(unsigned long offset, unsigned long size)
  69 {
  70         if (offset >= XCHAL_KIO_PADDR
  71             && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
  72                 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
  73
  74         else
  75                 BUG();
  76 }
  77
  78 static inline void *ioremap_nocache(unsigned long offset, unsigned long size)
  79 {
  80         if (offset >= XCHAL_KIO_PADDR
  81             && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
  82                 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
  83         else
  84                 BUG();
  85 }
  86
  87 static inline void iounmap(void *addr)
  88 {
  89 }
  90
  91 /*
  92  * Generic I/O
  93  */
  94
  95 #define readb(addr) \
  96         ({ unsigned char __v = (*(volatile unsigned char *)(addr)); __v; })
  97 #define readw(addr) \
  98         ({ unsigned short __v = (*(volatile unsigned short *)(addr)); __v; })
  99 #define readl(addr) \
 100         ({ unsigned int __v = (*(volatile unsigned int *)(addr)); __v; })
 101 #define writeb(b, addr) (void)((*(volatile unsigned char *)(addr)) = (b))
 102 #define writew(b, addr) (void)((*(volatile unsigned short *)(addr)) = (b))
 103 #define writel(b, addr) (void)((*(volatile unsigned int *)(addr)) = (b))
 104
 105 static inline __u8 __raw_readb(const volatile void __iomem *addr)
 106 {
 107           return *(__force volatile __u8 *)(addr);
 108 }
 109 static inline __u16 __raw_readw(const volatile void __iomem *addr)
 110 {
 111           return *(__force volatile __u16 *)(addr);
 112 }
 113 static inline __u32 __raw_readl(const volatile void __iomem *addr)
 114 {
 115           return *(__force volatile __u32 *)(addr);
 116 }
 117 static inline void __raw_writeb(__u8 b, volatile void __iomem *addr)
 118 {
 119           *(__force volatile __u8 *)(addr) = b;
 120 }
 121 static inline void __raw_writew(__u16 b, volatile void __iomem *addr)
 122 {
 123           *(__force volatile __u16 *)(addr) = b;
 124 }
 125 static inline void __raw_writel(__u32 b, volatile void __iomem *addr)
 126 {
 127           *(__force volatile __u32 *)(addr) = b;
 128 }
 129
 130 /* These are the definitions for the x86 IO instructions
 131  * inb/inw/inl/outb/outw/outl, the "string" versions
 132  * insb/insw/insl/outsb/outsw/outsl, and the "pausing" versions
 133  * inb_p/inw_p/...
 134  * The macros don't do byte-swapping.
 135  */
 136
 137 #define inb(port)               readb((u8 *)((port)))
 138 #define outb(val, port)         writeb((val),(u8 *)((unsigned long)(port)))
 139 #define inw(port)               readw((u16 *)((port)))
 140 #define outw(val, port)         writew((val),(u16 *)((unsigned long)(port)))
 141 #define inl(port)               readl((u32 *)((port)))
 142 #define outl(val, port)         writel((val),(u32 *)((unsigned long)(port)))
 143
 144 #define inb_p(port)             inb((port))
 145 #define outb_p(val, port)       outb((val), (port))
 146 #define inw_p(port)             inw((port))
 147 #define outw_p(val, port)       outw((val), (port))
 148 #define inl_p(port)             inl((port))
 149 #define outl_p(val, port)       outl((val), (port))
 150
 151 extern void insb (unsigned long port, void *dst, unsigned long count);
 152 extern void insw (unsigned long port, void *dst, unsigned long count);
 153 extern void insl (unsigned long port, void *dst, unsigned long count);
 154 extern void outsb (unsigned long port, const void *src, unsigned long count);
 155 extern void outsw (unsigned long port, const void *src, unsigned long count);
 156 extern void outsl (unsigned long port, const void *src, unsigned long count);
 157
 158 #define IO_SPACE_LIMIT ~0
 159
 160 #define memset_io(a,b,c)       memset((void *)(a),(b),(c))
 161 #define memcpy_fromio(a,b,c)   memcpy((a),(void *)(b),(c))
 162 #define memcpy_toio(a,b,c)      memcpy((void *)(a),(b),(c))
 163
 164 /* At this point the Xtensa doesn't provide byte swap instructions */
 165
 166 #ifdef __XTENSA_EB__
 167 # define in_8(addr) (*(u8*)(addr))
 168 # define in_le16(addr) _swapw(*(u16*)(addr))
 169 # define in_le32(addr) _swapl(*(u32*)(addr))
 170 # define out_8(b, addr) *(u8*)(addr) = (b)
 171 # define out_le16(b, addr) *(u16*)(addr) = _swapw(b)
 172 # define out_le32(b, addr) *(u32*)(addr) = _swapl(b)
 173 #elif defined(__XTENSA_EL__)
 174 # define in_8(addr)  (*(u8*)(addr))
 175 # define in_le16(addr) (*(u16*)(addr))
 176 # define in_le32(addr) (*(u32*)(addr))
 177 # define out_8(b, addr) *(u8*)(addr) = (b)
 178 # define out_le16(b, addr) *(u16*)(addr) = (b)
 179 # define out_le32(b, addr) *(u32*)(addr) = (b)
 180 #else
 181 # error processor byte order undefined!
 182 #endif
 183
 184
 185 /*
 186  * Convert a physical pointer to a virtual kernel pointer for /dev/mem access
 187  */
 188 #define xlate_dev_mem_ptr(p)    __va(p)
 189
 190 /*
 191  * Convert a virtual cached pointer to an uncached pointer
 192  */
 193 #define xlate_dev_kmem_ptr(p)   p
 194
 195
 196 #endif  /* __KERNEL__ */
 197
 198 #endif  /* _XTENSA_IO_H */