LXR linux-old/include/asm-arm/io.h

   1/*
   2 *  linux/include/asm-arm/io.h
   3 *
   4 *  Copyright (C) 1996-2000 Russell King
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License version 2 as
   8 * published by the Free Software Foundation.
   9 *
  10 * Modifications:
  11 *  16-Sep-1996 RMK     Inlined the inx/outx functions & optimised for both
  12 *                      constant addresses and variable addresses.
  13 *  04-Dec-1997 RMK     Moved a lot of this stuff to the new architecture
  14 *                      specific IO header files.
  15 *  27-Mar-1999 PJB     Second parameter of memcpy_toio is const..
  16 *  04-Apr-1999 PJB     Added check_signature.
  17 *  12-Dec-1999 RMK     More cleanups
  18 *  18-Jun-2000 RMK     Removed virt_to_* and friends definitions
  19 */
  20#ifndef __ASM_ARM_IO_H
  21#define __ASM_ARM_IO_H
  22
  23#ifdef __KERNEL__
  24
  25#include <linux/types.h>
  26#include <asm/byteorder.h>
  27#include <asm/memory.h>
  28#include <asm/arch/hardware.h>
  29
  30/*
  31 * Generic virtual read/write.  Note that we don't support half-word
  32 * read/writes.  We define __arch_*[bl] here, and leave __arch_*w
  33 * to the architecture specific code.
  34 */
  35#define __arch_getb(a)                  (*(volatile unsigned char *)(a))
  36#define __arch_getl(a)                  (*(volatile unsigned int  *)(a))
  37
  38#define __arch_putb(v,a)                (*(volatile unsigned char *)(a) = (v))
  39#define __arch_putl(v,a)                (*(volatile unsigned int  *)(a) = (v))
  40
  41extern void __raw_writesb(unsigned int addr, const void *data, int bytelen);
  42extern void __raw_writesw(unsigned int addr, const void *data, int wordlen);
  43extern void __raw_writesl(unsigned int addr, const void *data, int longlen);
  44
  45extern void __raw_readsb(unsigned int addr, void *data, int bytelen);
  46extern void __raw_readsw(unsigned int addr, void *data, int wordlen);
  47extern void __raw_readsl(unsigned int addr, void *data, int longlen);
  48
  49#define __raw_writeb(v,a)               __arch_putb(v,a)
  50#define __raw_writew(v,a)               __arch_putw(v,a)
  51#define __raw_writel(v,a)               __arch_putl(v,a)
  52
  53#define __raw_readb(a)                  __arch_getb(a)
  54#define __raw_readw(a)                  __arch_getw(a)
  55#define __raw_readl(a)                  __arch_getl(a)
  56
  57/*
  58 * The compiler seems to be incapable of optimising constants
  59 * properly.  Spell it out to the compiler in some cases.
  60 * These are only valid for small values of "off" (< 1<<12)
  61 */
  62#define __raw_base_writeb(val,base,off) __arch_base_putb(val,base,off)
  63#define __raw_base_writew(val,base,off) __arch_base_putw(val,base,off)
  64#define __raw_base_writel(val,base,off) __arch_base_putl(val,base,off)
  65
  66#define __raw_base_readb(base,off)      __arch_base_getb(base,off)
  67#define __raw_base_readw(base,off)      __arch_base_getw(base,off)
  68#define __raw_base_readl(base,off)      __arch_base_getl(base,off)
  69
  70/*
  71 * Now, pick up the machine-defined IO definitions
  72 */
  73#include <asm/arch/io.h>
  74
  75/*
  76 *  IO port access primitives
  77 *  -------------------------
  78 *
  79 * The ARM doesn't have special IO access instructions; all IO is memory
  80 * mapped.  Note that these are defined to perform little endian accesses
  81 * only.  Their primary purpose is to access PCI and ISA peripherals.
  82 *
  83 * Note that for a big endian machine, this implies that the following
  84 * big endian mode connectivity is in place, as described by numerious
  85 * ARM documents:
  86 *
  87 *    PCI:  D0-D7   D8-D15 D16-D23 D24-D31
  88 *    ARM: D24-D31 D16-D23  D8-D15  D0-D7
  89 *
  90 * The machine specific io.h include defines __io to translate an "IO"
  91 * address to a memory address.
  92 *
  93 * Note that we prevent GCC re-ordering or caching values in expressions
  94 * by introducing sequence points into the in*() definitions.  Note that
  95 * __raw_* do not guarantee this behaviour.
  96 *
  97 * The {in,out}[bwl] macros are for emulating x86-style PCI/ISA IO space.
  98 */
  99#ifdef __io
 100#define outb(v,p)                       __raw_writeb(v,__io(p))
 101#define outw(v,p)                       __raw_writew(cpu_to_le16(v),__io(p))
 102#define outl(v,p)                       __raw_writel(cpu_to_le32(v),__io(p))
 103
 104#define inb(p)  ({ unsigned int __v = __raw_readb(__io(p)); __v; })
 105#define inw(p)  ({ unsigned int __v = le16_to_cpu(__raw_readw(__io(p))); __v; })
 106#define inl(p)  ({ unsigned int __v = le32_to_cpu(__raw_readl(__io(p))); __v; })
 107
 108#define outsb(p,d,l)                    __raw_writesb(__io(p),d,l)
 109#define outsw(p,d,l)                    __raw_writesw(__io(p),d,l)
 110#define outsl(p,d,l)                    __raw_writesl(__io(p),d,l)
 111
 112#define insb(p,d,l)                     __raw_readsb(__io(p),d,l)
 113#define insw(p,d,l)                     __raw_readsw(__io(p),d,l)
 114#define insl(p,d,l)                     __raw_readsl(__io(p),d,l)
 115#endif
 116
 117#define outb_p(val,port)                outb((val),(port))
 118#define outw_p(val,port)                outw((val),(port))
 119#define outl_p(val,port)                outl((val),(port))
 120#define inb_p(port)                     inb((port))
 121#define inw_p(port)                     inw((port))
 122#define inl_p(port)                     inl((port))
 123
 124#define outsb_p(port,from,len)          outsb(port,from,len)
 125#define outsw_p(port,from,len)          outsw(port,from,len)
 126#define outsl_p(port,from,len)          outsl(port,from,len)
 127#define insb_p(port,to,len)             insb(port,to,len)
 128#define insw_p(port,to,len)             insw(port,to,len)
 129#define insl_p(port,to,len)             insl(port,to,len)
 130
 131/*
 132 * ioremap and friends.
 133 *
 134 * ioremap takes a PCI memory address, as specified in
 135 * linux/Documentation/IO-mapping.txt.  If you want a
 136 * physical address, use __ioremap instead.
 137 */
 138extern void * __ioremap(unsigned long offset, size_t size, unsigned long flags);
 139extern void __iounmap(void *addr);
 140
 141/*
 142 * Generic ioremap support.
 143 *
 144 * Define:
 145 *  iomem_valid_addr(off,size)
 146 *  iomem_to_phys(off)
 147 */
 148#ifdef iomem_valid_addr
 149#define __arch_ioremap(off,sz,nocache)                          \
 150 ({                                                             \
 151        unsigned long _off = (off), _size = (sz);               \
 152        void *_ret = (void *)0;                                 \
 153        if (iomem_valid_addr(_off, _size))                      \
 154                _ret = __ioremap(iomem_to_phys(_off),_size,0);  \
 155        _ret;                                                   \
 156 })
 157
 158#define __arch_iounmap __iounmap
 159#endif
 160
 161#define ioremap(off,sz)                 __arch_ioremap((off),(sz),0)
 162#define ioremap_nocache(off,sz)         __arch_ioremap((off),(sz),1)
 163#define iounmap(_addr)                  __arch_iounmap(_addr)
 164
 165/*
 166 * DMA-consistent mapping functions.  These allocate/free a region of
 167 * uncached, unwrite-buffered mapped memory space for use with DMA
 168 * devices.  This is the "generic" version.  The PCI specific version
 169 * is in pci.h
 170 */
 171extern void *consistent_alloc(int gfp, size_t size, dma_addr_t *handle);
 172extern void consistent_free(void *vaddr, size_t size, dma_addr_t handle);
 173extern void consistent_sync(void *vaddr, size_t size, int rw);
 174
 175/*
 176 * String version of IO memory access ops:
 177 */
 178extern void _memcpy_fromio(void *, unsigned long, size_t);
 179extern void _memcpy_toio(unsigned long, const void *, size_t);
 180extern void _memset_io(unsigned long, int, size_t);
 181
 182extern void __readwrite_bug(const char *fn);
 183
 184/*
 185 * If this architecture has PCI memory IO, then define the read/write
 186 * macros.  These should only be used with the cookie passed from
 187 * ioremap.
 188 */
 189#ifdef __mem_pci
 190
 191#define readb(c) ({ unsigned int __v = __raw_readb(__mem_pci(c)); __v; })
 192#define readw(c) ({ unsigned int __v = le16_to_cpu(__raw_readw(__mem_pci(c))); __v; })
 193#define readl(c) ({ unsigned int __v = le32_to_cpu(__raw_readl(__mem_pci(c))); __v; })
 194
 195#define writeb(v,c)             __raw_writeb(v,__mem_pci(c))
 196#define writew(v,c)             __raw_writew(cpu_to_le16(v),__mem_pci(c))
 197#define writel(v,c)             __raw_writel(cpu_to_le32(v),__mem_pci(c))
 198
 199#define memset_io(c,v,l)                _memset_io(__mem_pci(c),(v),(l))
 200#define memcpy_fromio(a,c,l)            _memcpy_fromio((a),__mem_pci(c),(l))
 201#define memcpy_toio(c,a,l)              _memcpy_toio(__mem_pci(c),(a),(l))
 202
 203#define eth_io_copy_and_sum(s,c,l,b) \
 204                                eth_copy_and_sum((s),__mem_pci(c),(l),(b))
 205
 206static inline int
 207check_signature(unsigned long io_addr, const unsigned char *signature,
 208                int length)
 209{
 210        int retval = 0;
 211        do {
 212                if (readb(io_addr) != *signature)
 213                        goto out;
 214                io_addr++;
 215                signature++;
 216                length--;
 217        } while (length);
 218        retval = 1;
 219out:
 220        return retval;
 221}
 222
 223#elif !defined(readb)
 224
 225#define readb(addr)                     (__readwrite_bug("readb"),0)
 226#define readw(addr)                     (__readwrite_bug("readw"),0)
 227#define readl(addr)                     (__readwrite_bug("readl"),0)
 228#define writeb(v,addr)                  __readwrite_bug("writeb")
 229#define writew(v,addr)                  __readwrite_bug("writew")
 230#define writel(v,addr)                  __readwrite_bug("writel")
 231
 232#define eth_io_copy_and_sum(a,b,c,d)    __readwrite_bug("eth_io_copy_and_sum")
 233
 234#define check_signature(io,sig,len)     (0)
 235
 236#endif  /* __mem_pci */
 237
 238/*
 239 * If this architecture has ISA IO, then define the isa_read/isa_write
 240 * macros.
 241 */
 242#ifdef __mem_isa
 243
 244#define isa_readb(addr)                 __raw_readb(__mem_isa(addr))
 245#define isa_readw(addr)                 __raw_readw(__mem_isa(addr))
 246#define isa_readl(addr)                 __raw_readl(__mem_isa(addr))
 247#define isa_writeb(val,addr)            __raw_writeb(val,__mem_isa(addr))
 248#define isa_writew(val,addr)            __raw_writew(val,__mem_isa(addr))
 249#define isa_writel(val,addr)            __raw_writel(val,__mem_isa(addr))
 250#define isa_memset_io(a,b,c)            _memset_io(__mem_isa(a),(b),(c))
 251#define isa_memcpy_fromio(a,b,c)        _memcpy_fromio((a),__mem_isa(b),(c))
 252#define isa_memcpy_toio(a,b,c)          _memcpy_toio(__mem_isa((a)),(b),(c))
 253
 254#define isa_eth_io_copy_and_sum(a,b,c,d) \
 255                                eth_copy_and_sum((a),__mem_isa(b),(c),(d))
 256
 257static inline int
 258isa_check_signature(unsigned long io_addr, const unsigned char *signature,
 259                    int length)
 260{
 261        int retval = 0;
 262        do {
 263                if (isa_readb(io_addr) != *signature)
 264                        goto out;
 265                io_addr++;
 266                signature++;
 267                length--;
 268        } while (length);
 269        retval = 1;
 270out:
 271        return retval;
 272}
 273
 274#else   /* __mem_isa */
 275
 276#define isa_readb(addr)                 (__readwrite_bug("isa_readb"),0)
 277#define isa_readw(addr)                 (__readwrite_bug("isa_readw"),0)
 278#define isa_readl(addr)                 (__readwrite_bug("isa_readl"),0)
 279#define isa_writeb(val,addr)            __readwrite_bug("isa_writeb")
 280#define isa_writew(val,addr)            __readwrite_bug("isa_writew")
 281#define isa_writel(val,addr)            __readwrite_bug("isa_writel")
 282#define isa_memset_io(a,b,c)            __readwrite_bug("isa_memset_io")
 283#define isa_memcpy_fromio(a,b,c)        __readwrite_bug("isa_memcpy_fromio")
 284#define isa_memcpy_toio(a,b,c)          __readwrite_bug("isa_memcpy_toio")
 285
 286#define isa_eth_io_copy_and_sum(a,b,c,d) \
 287                                __readwrite_bug("isa_eth_io_copy_and_sum")
 288
 289#define isa_check_signature(io,sig,len) (0)
 290
 291#endif  /* __mem_isa */
 292#endif  /* __KERNEL__ */
 293#endif  /* __ASM_ARM_IO_H */
 294