LXR uboot/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#if 0   /* XXX###XXX */
  29#include <asm/arch/hardware.h>
  30#endif  /* XXX###XXX */
  31
  32static inline void sync(void)
  33{
  34}
  35
  36/*
  37 * Given a physical address and a length, return a virtual address
  38 * that can be used to access the memory range with the caching
  39 * properties specified by "flags".
  40 */
  41#define MAP_NOCACHE     (0)
  42#define MAP_WRCOMBINE   (0)
  43#define MAP_WRBACK      (0)
  44#define MAP_WRTHROUGH   (0)
  45
  46static inline void *
  47map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
  48{
  49        return (void *)paddr;
  50}
  51
  52/*
  53 * Take down a mapping set up by map_physmem().
  54 */
  55static inline void unmap_physmem(void *vaddr, unsigned long flags)
  56{
  57
  58}
  59
  60static inline phys_addr_t virt_to_phys(void * vaddr)
  61{
  62        return (phys_addr_t)(vaddr);
  63}
  64
  65/*
  66 * Generic virtual read/write.  Note that we don't support half-word
  67 * read/writes.  We define __arch_*[bl] here, and leave __arch_*w
  68 * to the architecture specific code.
  69 */
  70#define __arch_getb(a)                  (*(volatile unsigned char *)(a))
  71#define __arch_getw(a)                  (*(volatile unsigned short *)(a))
  72#define __arch_getl(a)                  (*(volatile unsigned int *)(a))
  73
  74#define __arch_putb(v,a)                (*(volatile unsigned char *)(a) = (v))
  75#define __arch_putw(v,a)                (*(volatile unsigned short *)(a) = (v))
  76#define __arch_putl(v,a)                (*(volatile unsigned int *)(a) = (v))
  77
  78extern void __raw_writesb(unsigned int addr, const void *data, int bytelen);
  79extern void __raw_writesw(unsigned int addr, const void *data, int wordlen);
  80extern void __raw_writesl(unsigned int addr, const void *data, int longlen);
  81
  82extern void __raw_readsb(unsigned int addr, void *data, int bytelen);
  83extern void __raw_readsw(unsigned int addr, void *data, int wordlen);
  84extern void __raw_readsl(unsigned int addr, void *data, int longlen);
  85
  86#define __raw_writeb(v,a)               __arch_putb(v,a)
  87#define __raw_writew(v,a)               __arch_putw(v,a)
  88#define __raw_writel(v,a)               __arch_putl(v,a)
  89
  90#define __raw_readb(a)                  __arch_getb(a)
  91#define __raw_readw(a)                  __arch_getw(a)
  92#define __raw_readl(a)                  __arch_getl(a)
  93
  94#define writeb(v,a)                     __arch_putb(v,a)
  95#define writew(v,a)                     __arch_putw(v,a)
  96#define writel(v,a)                     __arch_putl(v,a)
  97
  98#define readb(a)                        __arch_getb(a)
  99#define readw(a)                        __arch_getw(a)
 100#define readl(a)                        __arch_getl(a)
 101
 102/*
 103 * The compiler seems to be incapable of optimising constants
 104 * properly.  Spell it out to the compiler in some cases.
 105 * These are only valid for small values of "off" (< 1<<12)
 106 */
 107#define __raw_base_writeb(val,base,off) __arch_base_putb(val,base,off)
 108#define __raw_base_writew(val,base,off) __arch_base_putw(val,base,off)
 109#define __raw_base_writel(val,base,off) __arch_base_putl(val,base,off)
 110
 111#define __raw_base_readb(base,off)      __arch_base_getb(base,off)
 112#define __raw_base_readw(base,off)      __arch_base_getw(base,off)
 113#define __raw_base_readl(base,off)      __arch_base_getl(base,off)
 114
 115/*
 116 * Now, pick up the machine-defined IO definitions
 117 */
 118#if 0   /* XXX###XXX */
 119#include <asm/arch/io.h>
 120#endif  /* XXX###XXX */
 121
 122/*
 123 *  IO port access primitives
 124 *  -------------------------
 125 *
 126 * The ARM doesn't have special IO access instructions; all IO is memory
 127 * mapped.  Note that these are defined to perform little endian accesses
 128 * only.  Their primary purpose is to access PCI and ISA peripherals.
 129 *
 130 * Note that for a big endian machine, this implies that the following
 131 * big endian mode connectivity is in place, as described by numerous
 132 * ARM documents:
 133 *
 134 *    PCI:  D0-D7   D8-D15 D16-D23 D24-D31
 135 *    ARM: D24-D31 D16-D23  D8-D15  D0-D7
 136 *
 137 * The machine specific io.h include defines __io to translate an "IO"
 138 * address to a memory address.
 139 *
 140 * Note that we prevent GCC re-ordering or caching values in expressions
 141 * by introducing sequence points into the in*() definitions.  Note that
 142 * __raw_* do not guarantee this behaviour.
 143 *
 144 * The {in,out}[bwl] macros are for emulating x86-style PCI/ISA IO space.
 145 */
 146#ifdef __io
 147#define outb(v,p)                       __raw_writeb(v,__io(p))
 148#define outw(v,p)                       __raw_writew(cpu_to_le16(v),__io(p))
 149#define outl(v,p)                       __raw_writel(cpu_to_le32(v),__io(p))
 150
 151#define inb(p)  ({ unsigned int __v = __raw_readb(__io(p)); __v; })
 152#define inw(p)  ({ unsigned int __v = le16_to_cpu(__raw_readw(__io(p))); __v; })
 153#define inl(p)  ({ unsigned int __v = le32_to_cpu(__raw_readl(__io(p))); __v; })
 154
 155#define outsb(p,d,l)                    __raw_writesb(__io(p),d,l)
 156#define outsw(p,d,l)                    __raw_writesw(__io(p),d,l)
 157#define outsl(p,d,l)                    __raw_writesl(__io(p),d,l)
 158
 159#define insb(p,d,l)                     __raw_readsb(__io(p),d,l)
 160#define insw(p,d,l)                     __raw_readsw(__io(p),d,l)
 161#define insl(p,d,l)                     __raw_readsl(__io(p),d,l)
 162#endif
 163
 164#define outb_p(val,port)                outb((val),(port))
 165#define outw_p(val,port)                outw((val),(port))
 166#define outl_p(val,port)                outl((val),(port))
 167#define inb_p(port)                     inb((port))
 168#define inw_p(port)                     inw((port))
 169#define inl_p(port)                     inl((port))
 170
 171#define outsb_p(port,from,len)          outsb(port,from,len)
 172#define outsw_p(port,from,len)          outsw(port,from,len)
 173#define outsl_p(port,from,len)          outsl(port,from,len)
 174#define insb_p(port,to,len)             insb(port,to,len)
 175#define insw_p(port,to,len)             insw(port,to,len)
 176#define insl_p(port,to,len)             insl(port,to,len)
 177
 178/*
 179 * ioremap and friends.
 180 *
 181 * ioremap takes a PCI memory address, as specified in
 182 * linux/Documentation/IO-mapping.txt.  If you want a
 183 * physical address, use __ioremap instead.
 184 */
 185extern void * __ioremap(unsigned long offset, size_t size, unsigned long flags);
 186extern void __iounmap(void *addr);
 187
 188/*
 189 * Generic ioremap support.
 190 *
 191 * Define:
 192 *  iomem_valid_addr(off,size)
 193 *  iomem_to_phys(off)
 194 */
 195#ifdef iomem_valid_addr
 196#define __arch_ioremap(off,sz,nocache)                          \
 197 ({                                                             \
 198        unsigned long _off = (off), _size = (sz);               \
 199        void *_ret = (void *)0;                                 \
 200        if (iomem_valid_addr(_off, _size))                      \
 201                _ret = __ioremap(iomem_to_phys(_off),_size,0);  \
 202        _ret;                                                   \
 203 })
 204
 205#define __arch_iounmap __iounmap
 206#endif
 207
 208#define ioremap(off,sz)                 __arch_ioremap((off),(sz),0)
 209#define ioremap_nocache(off,sz)         __arch_ioremap((off),(sz),1)
 210#define iounmap(_addr)                  __arch_iounmap(_addr)
 211
 212/*
 213 * DMA-consistent mapping functions.  These allocate/free a region of
 214 * uncached, unwrite-buffered mapped memory space for use with DMA
 215 * devices.  This is the "generic" version.  The PCI specific version
 216 * is in pci.h
 217 */
 218extern void *consistent_alloc(int gfp, size_t size, dma_addr_t *handle);
 219extern void consistent_free(void *vaddr, size_t size, dma_addr_t handle);
 220extern void consistent_sync(void *vaddr, size_t size, int rw);
 221
 222/*
 223 * String version of IO memory access ops:
 224 */
 225extern void _memcpy_fromio(void *, unsigned long, size_t);
 226extern void _memcpy_toio(unsigned long, const void *, size_t);
 227extern void _memset_io(unsigned long, int, size_t);
 228
 229extern void __readwrite_bug(const char *fn);
 230
 231/*
 232 * If this architecture has PCI memory IO, then define the read/write
 233 * macros.  These should only be used with the cookie passed from
 234 * ioremap.
 235 */
 236#ifdef __mem_pci
 237
 238#define readb(c) ({ unsigned int __v = __raw_readb(__mem_pci(c)); __v; })
 239#define readw(c) ({ unsigned int __v = le16_to_cpu(__raw_readw(__mem_pci(c))); __v; })
 240#define readl(c) ({ unsigned int __v = le32_to_cpu(__raw_readl(__mem_pci(c))); __v; })
 241
 242#define writeb(v,c)             __raw_writeb(v,__mem_pci(c))
 243#define writew(v,c)             __raw_writew(cpu_to_le16(v),__mem_pci(c))
 244#define writel(v,c)             __raw_writel(cpu_to_le32(v),__mem_pci(c))
 245
 246#define memset_io(c,v,l)                _memset_io(__mem_pci(c),(v),(l))
 247#define memcpy_fromio(a,c,l)            _memcpy_fromio((a),__mem_pci(c),(l))
 248#define memcpy_toio(c,a,l)              _memcpy_toio(__mem_pci(c),(a),(l))
 249
 250#define eth_io_copy_and_sum(s,c,l,b) \
 251                                eth_copy_and_sum((s),__mem_pci(c),(l),(b))
 252
 253static inline int
 254check_signature(unsigned long io_addr, const unsigned char *signature,
 255                int length)
 256{
 257        int retval = 0;
 258        do {
 259                if (readb(io_addr) != *signature)
 260                        goto out;
 261                io_addr++;
 262                signature++;
 263                length--;
 264        } while (length);
 265        retval = 1;
 266out:
 267        return retval;
 268}
 269
 270#elif !defined(readb)
 271
 272#define readb(addr)                     (__readwrite_bug("readb"),0)
 273#define readw(addr)                     (__readwrite_bug("readw"),0)
 274#define readl(addr)                     (__readwrite_bug("readl"),0)
 275#define writeb(v,addr)                  __readwrite_bug("writeb")
 276#define writew(v,addr)                  __readwrite_bug("writew")
 277#define writel(v,addr)                  __readwrite_bug("writel")
 278
 279#define eth_io_copy_and_sum(a,b,c,d)    __readwrite_bug("eth_io_copy_and_sum")
 280
 281#define check_signature(io,sig,len)     (0)
 282
 283#endif  /* __mem_pci */
 284
 285/*
 286 * If this architecture has ISA IO, then define the isa_read/isa_write
 287 * macros.
 288 */
 289#ifdef __mem_isa
 290
 291#define isa_readb(addr)                 __raw_readb(__mem_isa(addr))
 292#define isa_readw(addr)                 __raw_readw(__mem_isa(addr))
 293#define isa_readl(addr)                 __raw_readl(__mem_isa(addr))
 294#define isa_writeb(val,addr)            __raw_writeb(val,__mem_isa(addr))
 295#define isa_writew(val,addr)            __raw_writew(val,__mem_isa(addr))
 296#define isa_writel(val,addr)            __raw_writel(val,__mem_isa(addr))
 297#define isa_memset_io(a,b,c)            _memset_io(__mem_isa(a),(b),(c))
 298#define isa_memcpy_fromio(a,b,c)        _memcpy_fromio((a),__mem_isa(b),(c))
 299#define isa_memcpy_toio(a,b,c)          _memcpy_toio(__mem_isa((a)),(b),(c))
 300
 301#define isa_eth_io_copy_and_sum(a,b,c,d) \
 302                                eth_copy_and_sum((a),__mem_isa(b),(c),(d))
 303
 304static inline int
 305isa_check_signature(unsigned long io_addr, const unsigned char *signature,
 306                    int length)
 307{
 308        int retval = 0;
 309        do {
 310                if (isa_readb(io_addr) != *signature)
 311                        goto out;
 312                io_addr++;
 313                signature++;
 314                length--;
 315        } while (length);
 316        retval = 1;
 317out:
 318        return retval;
 319}
 320
 321#else   /* __mem_isa */
 322
 323#define isa_readb(addr)                 (__readwrite_bug("isa_readb"),0)
 324#define isa_readw(addr)                 (__readwrite_bug("isa_readw"),0)
 325#define isa_readl(addr)                 (__readwrite_bug("isa_readl"),0)
 326#define isa_writeb(val,addr)            __readwrite_bug("isa_writeb")
 327#define isa_writew(val,addr)            __readwrite_bug("isa_writew")
 328#define isa_writel(val,addr)            __readwrite_bug("isa_writel")
 329#define isa_memset_io(a,b,c)            __readwrite_bug("isa_memset_io")
 330#define isa_memcpy_fromio(a,b,c)        __readwrite_bug("isa_memcpy_fromio")
 331#define isa_memcpy_toio(a,b,c)          __readwrite_bug("isa_memcpy_toio")
 332
 333#define isa_eth_io_copy_and_sum(a,b,c,d) \
 334                                __readwrite_bug("isa_eth_io_copy_and_sum")
 335
 336#define isa_check_signature(io,sig,len) (0)
 337
 338#endif  /* __mem_isa */
 339#endif  /* __KERNEL__ */
 340#endif  /* __ASM_ARM_IO_H */
 341