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
  32 static 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
  46 static inline void *
  47 map_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  */
  55 static inline void unmap_physmem(void *vaddr, unsigned long flags)
  56 {
  57
  58 }
  59
  60 static 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
  78 extern void __raw_writesb(unsigned int addr, const void *data, int bytelen);
  79 extern void __raw_writesw(unsigned int addr, const void *data, int wordlen);
  80 extern void __raw_writesl(unsigned int addr, const void *data, int longlen);
  81
  82 extern void __raw_readsb(unsigned int addr, void *data, int bytelen);
  83 extern void __raw_readsw(unsigned int addr, void *data, int wordlen);
  84 extern 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  * Clear and set bits in one shot. These macros can be used to clear and
 117  * set multiple bits in a register using a single call. These macros can
 118  * also be used to set a multiple-bit bit pattern using a mask, by
 119  * specifying the mask in the 'clear' parameter and the new bit pattern
 120  * in the 'set' parameter.
 121  */
 122
 123 #define out_arch(type,endian,a,v)       __raw_write##type(cpu_to_##endian(v),a)
 124 #define in_arch(type,endian,a)          endian##_to_cpu(__raw_read##type(a))
 125
 126 #define out_le32(a,v)   out_arch(l,le32,a,v)
 127 #define out_le16(a,v)   out_arch(w,le16,a,v)
 128
 129 #define in_le32(a)      in_arch(l,le32,a)
 130 #define in_le16(a)      in_arch(w,le16,a)
 131
 132 #define out_be32(a,v)   out_arch(l,be32,a,v)
 133 #define out_be16(a,v)   out_arch(w,be16,a,v)
 134
 135 #define in_be32(a)      in_arch(l,be32,a)
 136 #define in_be16(a)      in_arch(w,be16,a)
 137
 138 #define out_8(a,v)      __raw_writeb(v,a)
 139 #define in_8(a)         __raw_readb(a)
 140
 141 #define clrbits(type, addr, clear) \
 142         out_##type((addr), in_##type(addr) & ~(clear))
 143
 144 #define setbits(type, addr, set) \
 145         out_##type((addr), in_##type(addr) | (set))
 146
 147 #define clrsetbits(type, addr, clear, set) \
 148         out_##type((addr), (in_##type(addr) & ~(clear)) | (set))
 149
 150 #define clrbits_be32(addr, clear) clrbits(be32, addr, clear)
 151 #define setbits_be32(addr, set) setbits(be32, addr, set)
 152 #define clrsetbits_be32(addr, clear, set) clrsetbits(be32, addr, clear, set)
 153
 154 #define clrbits_le32(addr, clear) clrbits(le32, addr, clear)
 155 #define setbits_le32(addr, set) setbits(le32, addr, set)
 156 #define clrsetbits_le32(addr, clear, set) clrsetbits(le32, addr, clear, set)
 157
 158 #define clrbits_be16(addr, clear) clrbits(be16, addr, clear)
 159 #define setbits_be16(addr, set) setbits(be16, addr, set)
 160 #define clrsetbits_be16(addr, clear, set) clrsetbits(be16, addr, clear, set)
 161
 162 #define clrbits_le16(addr, clear) clrbits(le16, addr, clear)
 163 #define setbits_le16(addr, set) setbits(le16, addr, set)
 164 #define clrsetbits_le16(addr, clear, set) clrsetbits(le16, addr, clear, set)
 165
 166 #define clrbits_8(addr, clear) clrbits(8, addr, clear)
 167 #define setbits_8(addr, set) setbits(8, addr, set)
 168 #define clrsetbits_8(addr, clear, set) clrsetbits(8, addr, clear, set)
 169
 170 /*
 171  * Now, pick up the machine-defined IO definitions
 172  */
 173 #if 0   /* XXX###XXX */
 174 #include <asm/arch/io.h>
 175 #endif  /* XXX###XXX */
 176
 177 /*
 178  *  IO port access primitives
 179  *  -------------------------
 180  *
 181  * The ARM doesn't have special IO access instructions; all IO is memory
 182  * mapped.  Note that these are defined to perform little endian accesses
 183  * only.  Their primary purpose is to access PCI and ISA peripherals.
 184  *
 185  * Note that for a big endian machine, this implies that the following
 186  * big endian mode connectivity is in place, as described by numerous
 187  * ARM documents:
 188  *
 189  *    PCI:  D0-D7   D8-D15 D16-D23 D24-D31
 190  *    ARM: D24-D31 D16-D23  D8-D15  D0-D7
 191  *
 192  * The machine specific io.h include defines __io to translate an "IO"
 193  * address to a memory address.
 194  *
 195  * Note that we prevent GCC re-ordering or caching values in expressions
 196  * by introducing sequence points into the in*() definitions.  Note that
 197  * __raw_* do not guarantee this behaviour.
 198  *
 199  * The {in,out}[bwl] macros are for emulating x86-style PCI/ISA IO space.
 200  */
 201 #ifdef __io
 202 #define outb(v,p)                       __raw_writeb(v,__io(p))
 203 #define outw(v,p)                       __raw_writew(cpu_to_le16(v),__io(p))
 204 #define outl(v,p)                       __raw_writel(cpu_to_le32(v),__io(p))
 205
 206 #define inb(p)  ({ unsigned int __v = __raw_readb(__io(p)); __v; })
 207 #define inw(p)  ({ unsigned int __v = le16_to_cpu(__raw_readw(__io(p))); __v; })
 208 #define inl(p)  ({ unsigned int __v = le32_to_cpu(__raw_readl(__io(p))); __v; })
 209
 210 #define outsb(p,d,l)                    __raw_writesb(__io(p),d,l)
 211 #define outsw(p,d,l)                    __raw_writesw(__io(p),d,l)
 212 #define outsl(p,d,l)                    __raw_writesl(__io(p),d,l)
 213
 214 #define insb(p,d,l)                     __raw_readsb(__io(p),d,l)
 215 #define insw(p,d,l)                     __raw_readsw(__io(p),d,l)
 216 #define insl(p,d,l)                     __raw_readsl(__io(p),d,l)
 217 #endif
 218
 219 #define outb_p(val,port)                outb((val),(port))
 220 #define outw_p(val,port)                outw((val),(port))
 221 #define outl_p(val,port)                outl((val),(port))
 222 #define inb_p(port)                     inb((port))
 223 #define inw_p(port)                     inw((port))
 224 #define inl_p(port)                     inl((port))
 225
 226 #define outsb_p(port,from,len)          outsb(port,from,len)
 227 #define outsw_p(port,from,len)          outsw(port,from,len)
 228 #define outsl_p(port,from,len)          outsl(port,from,len)
 229 #define insb_p(port,to,len)             insb(port,to,len)
 230 #define insw_p(port,to,len)             insw(port,to,len)
 231 #define insl_p(port,to,len)             insl(port,to,len)
 232
 233 /*
 234  * ioremap and friends.
 235  *
 236  * ioremap takes a PCI memory address, as specified in
 237  * linux/Documentation/IO-mapping.txt.  If you want a
 238  * physical address, use __ioremap instead.
 239  */
 240 extern void * __ioremap(unsigned long offset, size_t size, unsigned long flags);
 241 extern void __iounmap(void *addr);
 242
 243 /*
 244  * Generic ioremap support.
 245  *
 246  * Define:
 247  *  iomem_valid_addr(off,size)
 248  *  iomem_to_phys(off)
 249  */
 250 #ifdef iomem_valid_addr
 251 #define __arch_ioremap(off,sz,nocache)                          \
 252  ({                                                             \
 253         unsigned long _off = (off), _size = (sz);               \
 254         void *_ret = (void *)0;                                 \
 255         if (iomem_valid_addr(_off, _size))                      \
 256                 _ret = __ioremap(iomem_to_phys(_off),_size,0);  \
 257         _ret;                                                   \
 258  })
 259
 260 #define __arch_iounmap __iounmap
 261 #endif
 262
 263 #define ioremap(off,sz)                 __arch_ioremap((off),(sz),0)
 264 #define ioremap_nocache(off,sz)         __arch_ioremap((off),(sz),1)
 265 #define iounmap(_addr)                  __arch_iounmap(_addr)
 266
 267 /*
 268  * DMA-consistent mapping functions.  These allocate/free a region of
 269  * uncached, unwrite-buffered mapped memory space for use with DMA
 270  * devices.  This is the "generic" version.  The PCI specific version
 271  * is in pci.h
 272  */
 273 extern void *consistent_alloc(int gfp, size_t size, dma_addr_t *handle);
 274 extern void consistent_free(void *vaddr, size_t size, dma_addr_t handle);
 275 extern void consistent_sync(void *vaddr, size_t size, int rw);
 276
 277 /*
 278  * String version of IO memory access ops:
 279  */
 280 extern void _memcpy_fromio(void *, unsigned long, size_t);
 281 extern void _memcpy_toio(unsigned long, const void *, size_t);
 282 extern void _memset_io(unsigned long, int, size_t);
 283
 284 extern void __readwrite_bug(const char *fn);
 285
 286 /*
 287  * If this architecture has PCI memory IO, then define the read/write
 288  * macros.  These should only be used with the cookie passed from
 289  * ioremap.
 290  */
 291 #ifdef __mem_pci
 292
 293 #define readb(c) ({ unsigned int __v = __raw_readb(__mem_pci(c)); __v; })
 294 #define readw(c) ({ unsigned int __v = le16_to_cpu(__raw_readw(__mem_pci(c))); __v; })
 295 #define readl(c) ({ unsigned int __v = le32_to_cpu(__raw_readl(__mem_pci(c))); __v; })
 296
 297 #define writeb(v,c)             __raw_writeb(v,__mem_pci(c))
 298 #define writew(v,c)             __raw_writew(cpu_to_le16(v),__mem_pci(c))
 299 #define writel(v,c)             __raw_writel(cpu_to_le32(v),__mem_pci(c))
 300
 301 #define memset_io(c,v,l)                _memset_io(__mem_pci(c),(v),(l))
 302 #define memcpy_fromio(a,c,l)            _memcpy_fromio((a),__mem_pci(c),(l))
 303 #define memcpy_toio(c,a,l)              _memcpy_toio(__mem_pci(c),(a),(l))
 304
 305 #define eth_io_copy_and_sum(s,c,l,b) \
 306                                 eth_copy_and_sum((s),__mem_pci(c),(l),(b))
 307
 308 static inline int
 309 check_signature(unsigned long io_addr, const unsigned char *signature,
 310                 int length)
 311 {
 312         int retval = 0;
 313         do {
 314                 if (readb(io_addr) != *signature)
 315                         goto out;
 316                 io_addr++;
 317                 signature++;
 318                 length--;
 319         } while (length);
 320         retval = 1;
 321 out:
 322         return retval;
 323 }
 324
 325 #elif !defined(readb)
 326
 327 #define readb(addr)                     (__readwrite_bug("readb"),0)
 328 #define readw(addr)                     (__readwrite_bug("readw"),0)
 329 #define readl(addr)                     (__readwrite_bug("readl"),0)
 330 #define writeb(v,addr)                  __readwrite_bug("writeb")
 331 #define writew(v,addr)                  __readwrite_bug("writew")
 332 #define writel(v,addr)                  __readwrite_bug("writel")
 333
 334 #define eth_io_copy_and_sum(a,b,c,d)    __readwrite_bug("eth_io_copy_and_sum")
 335
 336 #define check_signature(io,sig,len)     (0)
 337
 338 #endif  /* __mem_pci */
 339
 340 /*
 341  * If this architecture has ISA IO, then define the isa_read/isa_write
 342  * macros.
 343  */
 344 #ifdef __mem_isa
 345
 346 #define isa_readb(addr)                 __raw_readb(__mem_isa(addr))
 347 #define isa_readw(addr)                 __raw_readw(__mem_isa(addr))
 348 #define isa_readl(addr)                 __raw_readl(__mem_isa(addr))
 349 #define isa_writeb(val,addr)            __raw_writeb(val,__mem_isa(addr))
 350 #define isa_writew(val,addr)            __raw_writew(val,__mem_isa(addr))
 351 #define isa_writel(val,addr)            __raw_writel(val,__mem_isa(addr))
 352 #define isa_memset_io(a,b,c)            _memset_io(__mem_isa(a),(b),(c))
 353 #define isa_memcpy_fromio(a,b,c)        _memcpy_fromio((a),__mem_isa(b),(c))
 354 #define isa_memcpy_toio(a,b,c)          _memcpy_toio(__mem_isa((a)),(b),(c))
 355
 356 #define isa_eth_io_copy_and_sum(a,b,c,d) \
 357                                 eth_copy_and_sum((a),__mem_isa(b),(c),(d))
 358
 359 static inline int
 360 isa_check_signature(unsigned long io_addr, const unsigned char *signature,
 361                     int length)
 362 {
 363         int retval = 0;
 364         do {
 365                 if (isa_readb(io_addr) != *signature)
 366                         goto out;
 367                 io_addr++;
 368                 signature++;
 369                 length--;
 370         } while (length);
 371         retval = 1;
 372 out:
 373         return retval;
 374 }
 375
 376 #else   /* __mem_isa */
 377
 378 #define isa_readb(addr)                 (__readwrite_bug("isa_readb"),0)
 379 #define isa_readw(addr)                 (__readwrite_bug("isa_readw"),0)
 380 #define isa_readl(addr)                 (__readwrite_bug("isa_readl"),0)
 381 #define isa_writeb(val,addr)            __readwrite_bug("isa_writeb")
 382 #define isa_writew(val,addr)            __readwrite_bug("isa_writew")
 383 #define isa_writel(val,addr)            __readwrite_bug("isa_writel")
 384 #define isa_memset_io(a,b,c)            __readwrite_bug("isa_memset_io")
 385 #define isa_memcpy_fromio(a,b,c)        __readwrite_bug("isa_memcpy_fromio")
 386 #define isa_memcpy_toio(a,b,c)          __readwrite_bug("isa_memcpy_toio")
 387
 388 #define isa_eth_io_copy_and_sum(a,b,c,d) \
 389                                 __readwrite_bug("isa_eth_io_copy_and_sum")
 390
 391 #define isa_check_signature(io,sig,len) (0)
 392
 393 #endif  /* __mem_isa */
 394 #endif  /* __KERNEL__ */
 395 #endif  /* __ASM_ARM_IO_H */