arch/arm/include/asm/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 #define __arch_getq(a)                  (*(volatile unsigned long long *)(a))
  74
  75 #define __arch_putb(v,a)                (*(volatile unsigned char *)(a) = (v))
  76 #define __arch_putw(v,a)                (*(volatile unsigned short *)(a) = (v))
  77 #define __arch_putl(v,a)                (*(volatile unsigned int *)(a) = (v))
  78 #define __arch_putq(v,a)                (*(volatile unsigned long long *)(a) = (v))
  79
  80 static inline void __raw_writesb(unsigned long addr, const void *data,
  81                                  int bytelen)
  82 {
  83         uint8_t *buf = (uint8_t *)data;
  84         while(bytelen--)
  85                 __arch_putb(*buf++, addr);
  86 }
  87
  88 static inline void __raw_writesw(unsigned long addr, const void *data,
  89                                  int wordlen)
  90 {
  91         uint16_t *buf = (uint16_t *)data;
  92         while(wordlen--)
  93                 __arch_putw(*buf++, addr);
  94 }
  95
  96 static inline void __raw_writesl(unsigned long addr, const void *data,
  97                                  int longlen)
  98 {
  99         uint32_t *buf = (uint32_t *)data;
 100         while(longlen--)
 101                 __arch_putl(*buf++, addr);
 102 }
 103
 104 static inline void __raw_readsb(unsigned long addr, void *data, int bytelen)
 105 {
 106         uint8_t *buf = (uint8_t *)data;
 107         while(bytelen--)
 108                 *buf++ = __arch_getb(addr);
 109 }
 110
 111 static inline void __raw_readsw(unsigned long addr, void *data, int wordlen)
 112 {
 113         uint16_t *buf = (uint16_t *)data;
 114         while(wordlen--)
 115                 *buf++ = __arch_getw(addr);
 116 }
 117
 118 static inline void __raw_readsl(unsigned long addr, void *data, int longlen)
 119 {
 120         uint32_t *buf = (uint32_t *)data;
 121         while(longlen--)
 122                 *buf++ = __arch_getl(addr);
 123 }
 124
 125 #define __raw_writeb(v,a)       __arch_putb(v,a)
 126 #define __raw_writew(v,a)       __arch_putw(v,a)
 127 #define __raw_writel(v,a)       __arch_putl(v,a)
 128 #define __raw_writeq(v,a)       __arch_putq(v,a)
 129
 130 #define __raw_readb(a)          __arch_getb(a)
 131 #define __raw_readw(a)          __arch_getw(a)
 132 #define __raw_readl(a)          __arch_getl(a)
 133 #define __raw_readq(a)          __arch_getq(a)
 134
 135 /*
 136  * TODO: The kernel offers some more advanced versions of barriers, it might
 137  * have some advantages to use them instead of the simple one here.
 138  */
 139 #define mb()            asm volatile("dsb sy" : : : "memory")
 140 #define dmb()           __asm__ __volatile__ ("" : : : "memory")
 141 #define __iormb()       dmb()
 142 #define __iowmb()       dmb()
 143
 144 #define writeb(v,c)     ({ u8  __v = v; __iowmb(); __arch_putb(__v,c); __v; })
 145 #define writew(v,c)     ({ u16 __v = v; __iowmb(); __arch_putw(__v,c); __v; })
 146 #define writel(v,c)     ({ u32 __v = v; __iowmb(); __arch_putl(__v,c); __v; })
 147 #define writeq(v,c)     ({ u64 __v = v; __iowmb(); __arch_putq(__v,c); __v; })
 148
 149 #define readb(c)        ({ u8  __v = __arch_getb(c); __iormb(); __v; })
 150 #define readw(c)        ({ u16 __v = __arch_getw(c); __iormb(); __v; })
 151 #define readl(c)        ({ u32 __v = __arch_getl(c); __iormb(); __v; })
 152 #define readq(c)        ({ u64 __v = __arch_getq(c); __iormb(); __v; })
 153
 154 /*
 155  * The compiler seems to be incapable of optimising constants
 156  * properly.  Spell it out to the compiler in some cases.
 157  * These are only valid for small values of "off" (< 1<<12)
 158  */
 159 #define __raw_base_writeb(val,base,off) __arch_base_putb(val,base,off)
 160 #define __raw_base_writew(val,base,off) __arch_base_putw(val,base,off)
 161 #define __raw_base_writel(val,base,off) __arch_base_putl(val,base,off)
 162
 163 #define __raw_base_readb(base,off)      __arch_base_getb(base,off)
 164 #define __raw_base_readw(base,off)      __arch_base_getw(base,off)
 165 #define __raw_base_readl(base,off)      __arch_base_getl(base,off)
 166
 167 /*
 168  * Clear and set bits in one shot. These macros can be used to clear and
 169  * set multiple bits in a register using a single call. These macros can
 170  * also be used to set a multiple-bit bit pattern using a mask, by
 171  * specifying the mask in the 'clear' parameter and the new bit pattern
 172  * in the 'set' parameter.
 173  */
 174
 175 #define out_arch(type,endian,a,v)       __raw_write##type(cpu_to_##endian(v),a)
 176 #define in_arch(type,endian,a)          endian##_to_cpu(__raw_read##type(a))
 177
 178 #define out_le64(a,v)   out_arch(q,le64,a,v)
 179 #define out_le32(a,v)   out_arch(l,le32,a,v)
 180 #define out_le16(a,v)   out_arch(w,le16,a,v)
 181
 182 #define in_le64(a)      in_arch(q,le64,a)
 183 #define in_le32(a)      in_arch(l,le32,a)
 184 #define in_le16(a)      in_arch(w,le16,a)
 185
 186 #define out_be32(a,v)   out_arch(l,be32,a,v)
 187 #define out_be16(a,v)   out_arch(w,be16,a,v)
 188
 189 #define in_be32(a)      in_arch(l,be32,a)
 190 #define in_be16(a)      in_arch(w,be16,a)
 191
 192 #define out_8(a,v)      __raw_writeb(v,a)
 193 #define in_8(a)         __raw_readb(a)
 194
 195 #define clrbits(type, addr, clear) \
 196         out_##type((addr), in_##type(addr) & ~(clear))
 197
 198 #define setbits(type, addr, set) \
 199         out_##type((addr), in_##type(addr) | (set))
 200
 201 #define clrsetbits(type, addr, clear, set) \
 202         out_##type((addr), (in_##type(addr) & ~(clear)) | (set))
 203
 204 #define clrbits_be32(addr, clear) clrbits(be32, addr, clear)
 205 #define setbits_be32(addr, set) setbits(be32, addr, set)
 206 #define clrsetbits_be32(addr, clear, set) clrsetbits(be32, addr, clear, set)
 207
 208 #define clrbits_le32(addr, clear) clrbits(le32, addr, clear)
 209 #define setbits_le32(addr, set) setbits(le32, addr, set)
 210 #define clrsetbits_le32(addr, clear, set) clrsetbits(le32, addr, clear, set)
 211
 212 #define clrbits_be16(addr, clear) clrbits(be16, addr, clear)
 213 #define setbits_be16(addr, set) setbits(be16, addr, set)
 214 #define clrsetbits_be16(addr, clear, set) clrsetbits(be16, addr, clear, set)
 215
 216 #define clrbits_le16(addr, clear) clrbits(le16, addr, clear)
 217 #define setbits_le16(addr, set) setbits(le16, addr, set)
 218 #define clrsetbits_le16(addr, clear, set) clrsetbits(le16, addr, clear, set)
 219
 220 #define clrbits_8(addr, clear) clrbits(8, addr, clear)
 221 #define setbits_8(addr, set) setbits(8, addr, set)
 222 #define clrsetbits_8(addr, clear, set) clrsetbits(8, addr, clear, set)
 223
 224 /*
 225  * Now, pick up the machine-defined IO definitions
 226  */
 227 #if 0   /* XXX###XXX */
 228 #include <asm/arch/io.h>
 229 #endif  /* XXX###XXX */
 230
 231 /*
 232  *  IO port access primitives
 233  *  -------------------------
 234  *
 235  * The ARM doesn't have special IO access instructions; all IO is memory
 236  * mapped.  Note that these are defined to perform little endian accesses
 237  * only.  Their primary purpose is to access PCI and ISA peripherals.
 238  *
 239  * Note that for a big endian machine, this implies that the following
 240  * big endian mode connectivity is in place, as described by numerous
 241  * ARM documents:
 242  *
 243  *    PCI:  D0-D7   D8-D15 D16-D23 D24-D31
 244  *    ARM: D24-D31 D16-D23  D8-D15  D0-D7
 245  *
 246  * The machine specific io.h include defines __io to translate an "IO"
 247  * address to a memory address.
 248  *
 249  * Note that we prevent GCC re-ordering or caching values in expressions
 250  * by introducing sequence points into the in*() definitions.  Note that
 251  * __raw_* do not guarantee this behaviour.
 252  *
 253  * The {in,out}[bwl] macros are for emulating x86-style PCI/ISA IO space.
 254  */
 255 #ifdef __io
 256 #define outb(v,p)                       __raw_writeb(v,__io(p))
 257 #define outw(v,p)                       __raw_writew(cpu_to_le16(v),__io(p))
 258 #define outl(v,p)                       __raw_writel(cpu_to_le32(v),__io(p))
 259
 260 #define inb(p)  ({ unsigned int __v = __raw_readb(__io(p)); __v; })
 261 #define inw(p)  ({ unsigned int __v = le16_to_cpu(__raw_readw(__io(p))); __v; })
 262 #define inl(p)  ({ unsigned int __v = le32_to_cpu(__raw_readl(__io(p))); __v; })
 263
 264 #define outsb(p,d,l)                    __raw_writesb(__io(p),d,l)
 265 #define outsw(p,d,l)                    __raw_writesw(__io(p),d,l)
 266 #define outsl(p,d,l)                    __raw_writesl(__io(p),d,l)
 267
 268 #define insb(p,d,l)                     __raw_readsb(__io(p),d,l)
 269 #define insw(p,d,l)                     __raw_readsw(__io(p),d,l)
 270 #define insl(p,d,l)                     __raw_readsl(__io(p),d,l)
 271 #endif
 272
 273 #define outb_p(val,port)                outb((val),(port))
 274 #define outw_p(val,port)                outw((val),(port))
 275 #define outl_p(val,port)                outl((val),(port))
 276 #define inb_p(port)                     inb((port))
 277 #define inw_p(port)                     inw((port))
 278 #define inl_p(port)                     inl((port))
 279
 280 #define outsb_p(port,from,len)          outsb(port,from,len)
 281 #define outsw_p(port,from,len)          outsw(port,from,len)
 282 #define outsl_p(port,from,len)          outsl(port,from,len)
 283 #define insb_p(port,to,len)             insb(port,to,len)
 284 #define insw_p(port,to,len)             insw(port,to,len)
 285 #define insl_p(port,to,len)             insl(port,to,len)
 286
 287 /*
 288  * ioremap and friends.
 289  *
 290  * ioremap takes a PCI memory address, as specified in
 291  * linux/Documentation/IO-mapping.txt.  If you want a
 292  * physical address, use __ioremap instead.
 293  */
 294 extern void * __ioremap(unsigned long offset, size_t size, unsigned long flags);
 295 extern void __iounmap(void *addr);
 296
 297 /*
 298  * Generic ioremap support.
 299  *
 300  * Define:
 301  *  iomem_valid_addr(off,size)
 302  *  iomem_to_phys(off)
 303  */
 304 #ifdef iomem_valid_addr
 305 #define __arch_ioremap(off,sz,nocache)                                  \
 306  ({                                                                     \
 307         unsigned long _off = (off), _size = (sz);                       \
 308         void *_ret = (void *)0;                                         \
 309         if (iomem_valid_addr(_off, _size))                              \
 310                 _ret = __ioremap(iomem_to_phys(_off),_size,nocache);    \
 311         _ret;                                                           \
 312  })
 313
 314 #define __arch_iounmap __iounmap
 315 #endif
 316
 317 #define ioremap(off,sz)                 __arch_ioremap((off),(sz),0)
 318 #define ioremap_nocache(off,sz)         __arch_ioremap((off),(sz),1)
 319 #define iounmap(_addr)                  __arch_iounmap(_addr)
 320
 321 /*
 322  * DMA-consistent mapping functions.  These allocate/free a region of
 323  * uncached, unwrite-buffered mapped memory space for use with DMA
 324  * devices.  This is the "generic" version.  The PCI specific version
 325  * is in pci.h
 326  */
 327 extern void *consistent_alloc(int gfp, size_t size, dma_addr_t *handle);
 328 extern void consistent_free(void *vaddr, size_t size, dma_addr_t handle);
 329 extern void consistent_sync(void *vaddr, size_t size, int rw);
 330
 331 /*
 332  * String version of IO memory access ops:
 333  */
 334 extern void _memcpy_fromio(void *, unsigned long, size_t);
 335 extern void _memcpy_toio(unsigned long, const void *, size_t);
 336 extern void _memset_io(unsigned long, int, size_t);
 337
 338 extern void __readwrite_bug(const char *fn);
 339
 340 /*
 341  * If this architecture has PCI memory IO, then define the read/write
 342  * macros.  These should only be used with the cookie passed from
 343  * ioremap.
 344  */
 345 #ifdef __mem_pci
 346
 347 #define readb(c) ({ unsigned int __v = __raw_readb(__mem_pci(c)); __v; })
 348 #define readw(c) ({ unsigned int __v = le16_to_cpu(__raw_readw(__mem_pci(c))); __v; })
 349 #define readl(c) ({ unsigned int __v = le32_to_cpu(__raw_readl(__mem_pci(c))); __v; })
 350
 351 #define writeb(v,c)             __raw_writeb(v,__mem_pci(c))
 352 #define writew(v,c)             __raw_writew(cpu_to_le16(v),__mem_pci(c))
 353 #define writel(v,c)             __raw_writel(cpu_to_le32(v),__mem_pci(c))
 354
 355 #define memset_io(c,v,l)                _memset_io(__mem_pci(c),(v),(l))
 356 #define memcpy_fromio(a,c,l)            _memcpy_fromio((a),__mem_pci(c),(l))
 357 #define memcpy_toio(c,a,l)              _memcpy_toio(__mem_pci(c),(a),(l))
 358
 359 #define eth_io_copy_and_sum(s,c,l,b) \
 360                                 eth_copy_and_sum((s),__mem_pci(c),(l),(b))
 361
 362 static inline int
 363 check_signature(unsigned long io_addr, const unsigned char *signature,
 364                 int length)
 365 {
 366         int retval = 0;
 367         do {
 368                 if (readb(io_addr) != *signature)
 369                         goto out;
 370                 io_addr++;
 371                 signature++;
 372                 length--;
 373         } while (length);
 374         retval = 1;
 375 out:
 376         return retval;
 377 }
 378
 379 #else
 380 #define memset_io(a, b, c)              memset((void *)(a), (b), (c))
 381 #define memcpy_fromio(a, b, c)          memcpy((a), (void *)(b), (c))
 382 #define memcpy_toio(a, b, c)            memcpy((void *)(a), (b), (c))
 383
 384 #if !defined(readb)
 385
 386 #define readb(addr)                     (__readwrite_bug("readb"),0)
 387 #define readw(addr)                     (__readwrite_bug("readw"),0)
 388 #define readl(addr)                     (__readwrite_bug("readl"),0)
 389 #define writeb(v,addr)                  __readwrite_bug("writeb")
 390 #define writew(v,addr)                  __readwrite_bug("writew")
 391 #define writel(v,addr)                  __readwrite_bug("writel")
 392
 393 #define eth_io_copy_and_sum(a,b,c,d)    __readwrite_bug("eth_io_copy_and_sum")
 394
 395 #define check_signature(io,sig,len)     (0)
 396
 397 #endif
 398 #endif  /* __mem_pci */
 399
 400 /*
 401  * If this architecture has ISA IO, then define the isa_read/isa_write
 402  * macros.
 403  */
 404 #ifdef __mem_isa
 405
 406 #define isa_readb(addr)                 __raw_readb(__mem_isa(addr))
 407 #define isa_readw(addr)                 __raw_readw(__mem_isa(addr))
 408 #define isa_readl(addr)                 __raw_readl(__mem_isa(addr))
 409 #define isa_writeb(val,addr)            __raw_writeb(val,__mem_isa(addr))
 410 #define isa_writew(val,addr)            __raw_writew(val,__mem_isa(addr))
 411 #define isa_writel(val,addr)            __raw_writel(val,__mem_isa(addr))
 412 #define isa_memset_io(a,b,c)            _memset_io(__mem_isa(a),(b),(c))
 413 #define isa_memcpy_fromio(a,b,c)        _memcpy_fromio((a),__mem_isa(b),(c))
 414 #define isa_memcpy_toio(a,b,c)          _memcpy_toio(__mem_isa((a)),(b),(c))
 415
 416 #define isa_eth_io_copy_and_sum(a,b,c,d) \
 417                                 eth_copy_and_sum((a),__mem_isa(b),(c),(d))
 418
 419 static inline int
 420 isa_check_signature(unsigned long io_addr, const unsigned char *signature,
 421                     int length)
 422 {
 423         int retval = 0;
 424         do {
 425                 if (isa_readb(io_addr) != *signature)
 426                         goto out;
 427                 io_addr++;
 428                 signature++;
 429                 length--;
 430         } while (length);
 431         retval = 1;
 432 out:
 433         return retval;
 434 }
 435
 436 #else   /* __mem_isa */
 437
 438 #define isa_readb(addr)                 (__readwrite_bug("isa_readb"),0)
 439 #define isa_readw(addr)                 (__readwrite_bug("isa_readw"),0)
 440 #define isa_readl(addr)                 (__readwrite_bug("isa_readl"),0)
 441 #define isa_writeb(val,addr)            __readwrite_bug("isa_writeb")
 442 #define isa_writew(val,addr)            __readwrite_bug("isa_writew")
 443 #define isa_writel(val,addr)            __readwrite_bug("isa_writel")
 444 #define isa_memset_io(a,b,c)            __readwrite_bug("isa_memset_io")
 445 #define isa_memcpy_fromio(a,b,c)        __readwrite_bug("isa_memcpy_fromio")
 446 #define isa_memcpy_toio(a,b,c)          __readwrite_bug("isa_memcpy_toio")
 447
 448 #define isa_eth_io_copy_and_sum(a,b,c,d) \
 449                                 __readwrite_bug("isa_eth_io_copy_and_sum")
 450
 451 #define isa_check_signature(io,sig,len) (0)
 452
 453 #endif  /* __mem_isa */
 454 #endif  /* __KERNEL__ */
 455
 456 #include <iotrace.h>
 457
 458 #endif  /* __ASM_ARM_IO_H */