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/bug.h>
  18 #include <linux/kernel.h>
  19
  20 #include <linux/types.h>
  21
  22 #define XCHAL_KIO_CACHED_VADDR  0xe0000000
  23 #define XCHAL_KIO_BYPASS_VADDR  0xf0000000
  24 #define XCHAL_KIO_PADDR         0xf0000000
  25 #define XCHAL_KIO_SIZE          0x10000000
  26
  27 #define IOADDR(x)               (XCHAL_KIO_BYPASS_VADDR + (x))
  28
  29 /*
  30  * swap functions to change byte order from little-endian to big-endian and
  31  * vice versa.
  32  */
  33
  34 static inline unsigned short _swapw (unsigned short v)
  35 {
  36         return (v << 8) | (v >> 8);
  37 }
  38
  39 static inline unsigned int _swapl (unsigned int v)
  40 {
  41         return (v << 24) | ((v & 0xff00) << 8) | ((v >> 8) & 0xff00) | (v >> 24);
  42 }
  43
  44 /*
  45  * Change virtual addresses to physical addresses and vv.
  46  * These are trivial on the 1:1 Linux/Xtensa mapping
  47  */
  48
  49 static inline unsigned long virt_to_phys(volatile void * address)
  50 {
  51         return __pa(address);
  52 }
  53
  54 static inline void * phys_to_virt(unsigned long address)
  55 {
  56         return __va(address);
  57 }
  58
  59 /*
  60  * virt_to_bus and bus_to_virt are deprecated.
  61  */
  62
  63 #define virt_to_bus(x)  virt_to_phys(x)
  64 #define bus_to_virt(x)  phys_to_virt(x)
  65
  66 /*
  67  * Return the virtual (cached) address for the specified bus memory.
  68  * Note that we currently don't support any address outside the KIO segment.
  69  */
  70
  71 static inline void *ioremap(unsigned long offset, unsigned long size)
  72 {
  73 #ifdef CONFIG_MMU
  74         if (offset >= XCHAL_KIO_PADDR
  75             && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
  76                 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
  77         else
  78                 BUG();
  79 #else
  80         return (void *)offset;
  81 #endif
  82 }
  83
  84 static inline void *ioremap_nocache(unsigned long offset, unsigned long size)
  85 {
  86 #ifdef CONFIG_MMU
  87         if (offset >= XCHAL_KIO_PADDR
  88             && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
  89                 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
  90         else
  91                 BUG();
  92 #else
  93         return (void *)offset;
  94 #endif
  95 }
  96
  97 static inline void iounmap(void *addr)
  98 {
  99 }
 100
 101 /*
 102  * Generic I/O
 103  */
 104
 105 #define readb(addr) \
 106         ({ unsigned char __v = (*(volatile unsigned char *)(addr)); __v; })
 107 #define readw(addr) \
 108         ({ unsigned short __v = (*(volatile unsigned short *)(addr)); __v; })
 109 #define readl(addr) \
 110         ({ unsigned int __v = (*(volatile unsigned int *)(addr)); __v; })
 111 #define writeb(b, addr) (void)((*(volatile unsigned char *)(addr)) = (b))
 112 #define writew(b, addr) (void)((*(volatile unsigned short *)(addr)) = (b))
 113 #define writel(b, addr) (void)((*(volatile unsigned int *)(addr)) = (b))
 114
 115 static inline __u8 __raw_readb(const volatile void __iomem *addr)
 116 {
 117           return *(__force volatile __u8 *)(addr);
 118 }
 119 static inline __u16 __raw_readw(const volatile void __iomem *addr)
 120 {
 121           return *(__force volatile __u16 *)(addr);
 122 }
 123 static inline __u32 __raw_readl(const volatile void __iomem *addr)
 124 {
 125           return *(__force volatile __u32 *)(addr);
 126 }
 127 static inline void __raw_writeb(__u8 b, volatile void __iomem *addr)
 128 {
 129           *(__force volatile __u8 *)(addr) = b;
 130 }
 131 static inline void __raw_writew(__u16 b, volatile void __iomem *addr)
 132 {
 133           *(__force volatile __u16 *)(addr) = b;
 134 }
 135 static inline void __raw_writel(__u32 b, volatile void __iomem *addr)
 136 {
 137           *(__force volatile __u32 *)(addr) = b;
 138 }
 139
 140 /* These are the definitions for the x86 IO instructions
 141  * inb/inw/inl/outb/outw/outl, the "string" versions
 142  * insb/insw/insl/outsb/outsw/outsl, and the "pausing" versions
 143  * inb_p/inw_p/...
 144  * The macros don't do byte-swapping.
 145  */
 146
 147 #define inb(port)               readb((u8 *)((port)))
 148 #define outb(val, port)         writeb((val),(u8 *)((unsigned long)(port)))
 149 #define inw(port)               readw((u16 *)((port)))
 150 #define outw(val, port)         writew((val),(u16 *)((unsigned long)(port)))
 151 #define inl(port)               readl((u32 *)((port)))
 152 #define outl(val, port)         writel((val),(u32 *)((unsigned long)(port)))
 153
 154 #define inb_p(port)             inb((port))
 155 #define outb_p(val, port)       outb((val), (port))
 156 #define inw_p(port)             inw((port))
 157 #define outw_p(val, port)       outw((val), (port))
 158 #define inl_p(port)             inl((port))
 159 #define outl_p(val, port)       outl((val), (port))
 160
 161 extern void insb (unsigned long port, void *dst, unsigned long count);
 162 extern void insw (unsigned long port, void *dst, unsigned long count);
 163 extern void insl (unsigned long port, void *dst, unsigned long count);
 164 extern void outsb (unsigned long port, const void *src, unsigned long count);
 165 extern void outsw (unsigned long port, const void *src, unsigned long count);
 166 extern void outsl (unsigned long port, const void *src, unsigned long count);
 167
 168 #define IO_SPACE_LIMIT ~0
 169
 170 #define memset_io(a,b,c)       memset((void *)(a),(b),(c))
 171 #define memcpy_fromio(a,b,c)   memcpy((a),(void *)(b),(c))
 172 #define memcpy_toio(a,b,c)      memcpy((void *)(a),(b),(c))
 173
 174 /* At this point the Xtensa doesn't provide byte swap instructions */
 175
 176 #ifdef __XTENSA_EB__
 177 # define in_8(addr) (*(u8*)(addr))
 178 # define in_le16(addr) _swapw(*(u16*)(addr))
 179 # define in_le32(addr) _swapl(*(u32*)(addr))
 180 # define out_8(b, addr) *(u8*)(addr) = (b)
 181 # define out_le16(b, addr) *(u16*)(addr) = _swapw(b)
 182 # define out_le32(b, addr) *(u32*)(addr) = _swapl(b)
 183 #elif defined(__XTENSA_EL__)
 184 # define in_8(addr)  (*(u8*)(addr))
 185 # define in_le16(addr) (*(u16*)(addr))
 186 # define in_le32(addr) (*(u32*)(addr))
 187 # define out_8(b, addr) *(u8*)(addr) = (b)
 188 # define out_le16(b, addr) *(u16*)(addr) = (b)
 189 # define out_le32(b, addr) *(u32*)(addr) = (b)
 190 #else
 191 # error processor byte order undefined!
 192 #endif
 193
 194
 195 /*
 196  * Convert a physical pointer to a virtual kernel pointer for /dev/mem access
 197  */
 198 #define xlate_dev_mem_ptr(p)    __va(p)
 199
 200 /*
 201  * Convert a virtual cached pointer to an uncached pointer
 202  */
 203 #define xlate_dev_kmem_ptr(p)   p
 204
 205
 206 #endif  /* __KERNEL__ */
 207
 208 #endif  /* _XTENSA_IO_H */