include/asm-arm26/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/config.h>
  26 #include <linux/types.h>
  27 #include <asm/byteorder.h>
  28 #include <asm/memory.h>
  29 #include <asm/hardware.h>
  30
  31 /*
  32  * Generic IO read/write.  These perform native-endian accesses.  Note
  33  * that some architectures will want to re-define __raw_{read,write}w.
  34  */
  35 extern void __raw_writesb(unsigned int addr, const void *data, int bytelen);
  36 extern void __raw_writesw(unsigned int addr, const void *data, int wordlen);
  37 extern void __raw_writesl(unsigned int addr, const void *data, int longlen);
  38
  39 extern void __raw_readsb(unsigned int addr, void *data, int bytelen);
  40 extern void __raw_readsw(unsigned int addr, void *data, int wordlen);
  41 extern void __raw_readsl(unsigned int addr, void *data, int longlen);
  42
  43 #define __raw_writeb(v,a)       (*(volatile unsigned char  *)(a) = (v))
  44 #define __raw_writew(v,a)       (*(volatile unsigned short *)(a) = (v))
  45 #define __raw_writel(v,a)       (*(volatile unsigned int   *)(a) = (v))
  46
  47 #define __raw_readb(a)          (*(volatile unsigned char  *)(a))
  48 #define __raw_readw(a)          (*(volatile unsigned short *)(a))
  49 #define __raw_readl(a)          (*(volatile unsigned int   *)(a))
  50
  51
  52 /*
  53  * Bad read/write accesses...
  54  */
  55 extern void __readwrite_bug(const char *fn);
  56
  57 /*
  58  * Now, pick up the machine-defined IO definitions
  59  */
  60
  61 #define IO_SPACE_LIMIT 0xffffffff
  62
  63 /*
  64  * GCC is totally crap at loading/storing data.  We try to persuade it
  65  * to do the right thing by using these whereever possible instead of
  66  * the above.
  67  */
  68 #define __arch_base_getb(b,o)                   \
  69  ({                                             \
  70         unsigned int v, r = (b);                \
  71         __asm__ __volatile__(                   \
  72                 "ldrb   %0, [%1, %2]"           \
  73                 : "=r" (v)                      \
  74                 : "r" (r), "Ir" (o));           \
  75         v;                                      \
  76  })
  77
  78 #define __arch_base_getl(b,o)                   \
  79  ({                                             \
  80         unsigned int v, r = (b);                \
  81         __asm__ __volatile__(                   \
  82                 "ldr    %0, [%1, %2]"           \
  83                 : "=r" (v)                      \
  84                 : "r" (r), "Ir" (o));           \
  85         v;                                      \
  86  })
  87
  88 #define __arch_base_putb(v,b,o)                 \
  89  ({                                             \
  90         unsigned int r = (b);                   \
  91         __asm__ __volatile__(                   \
  92                 "strb   %0, [%1, %2]"           \
  93                 :                               \
  94                 : "r" (v), "r" (r), "Ir" (o));  \
  95  })
  96
  97 #define __arch_base_putl(v,b,o)                 \
  98  ({                                             \
  99         unsigned int r = (b);                   \
 100         __asm__ __volatile__(                   \
 101                 "str    %0, [%1, %2]"           \
 102                 :                               \
 103                 : "r" (v), "r" (r), "Ir" (o));  \
 104  })
 105
 106 /*
 107  * We use two different types of addressing - PC style addresses, and ARM
 108  * addresses.  PC style accesses the PC hardware with the normal PC IO
 109  * addresses, eg 0x3f8 for serial#1.  ARM addresses are 0x80000000+
 110  * and are translated to the start of IO.  Note that all addresses are
 111  * shifted left!
 112  */
 113 #define __PORT_PCIO(x)  (!((x) & 0x80000000))
 114
 115 /*
 116  * Dynamic IO functions - let the compiler
 117  * optimize the expressions
 118  */
 119 static inline void __outb (unsigned int value, unsigned int port)
 120 {
 121         unsigned long temp;
 122         __asm__ __volatile__(
 123         "tst    %2, #0x80000000\n\t"
 124         "mov    %0, %4\n\t"
 125         "addeq  %0, %0, %3\n\t"
 126         "strb   %1, [%0, %2, lsl #2]    @ outb"
 127         : "=&r" (temp)
 128         : "r" (value), "r" (port), "Ir" (PCIO_BASE - IO_BASE), "Ir" (IO_BASE)
 129         : "cc");
 130 }
 131
 132 static inline void __outw (unsigned int value, unsigned int port)
 133 {
 134         unsigned long temp;
 135         __asm__ __volatile__(
 136         "tst    %2, #0x80000000\n\t"
 137         "mov    %0, %4\n\t"
 138         "addeq  %0, %0, %3\n\t"
 139         "str    %1, [%0, %2, lsl #2]    @ outw"
 140         : "=&r" (temp)
 141         : "r" (value|value<<16), "r" (port), "Ir" (PCIO_BASE - IO_BASE), "Ir" (IO_BASE)
 142         : "cc");
 143 }
 144
 145 static inline void __outl (unsigned int value, unsigned int port)
 146 {
 147         unsigned long temp;
 148         __asm__ __volatile__(
 149         "tst    %2, #0x80000000\n\t"
 150         "mov    %0, %4\n\t"
 151         "addeq  %0, %0, %3\n\t"
 152         "str    %1, [%0, %2, lsl #2]    @ outl"
 153         : "=&r" (temp)
 154         : "r" (value), "r" (port), "Ir" (PCIO_BASE - IO_BASE), "Ir" (IO_BASE)
 155         : "cc");
 156 }
 157
 158 #define DECLARE_DYN_IN(sz,fnsuffix,instr)                                       \
 159 static inline unsigned sz __in##fnsuffix (unsigned int port)            \
 160 {                                                                               \
 161         unsigned long temp, value;                                              \
 162         __asm__ __volatile__(                                                   \
 163         "tst    %2, #0x80000000\n\t"                                            \
 164         "mov    %0, %4\n\t"                                                     \
 165         "addeq  %0, %0, %3\n\t"                                                 \
 166         "ldr" instr "   %1, [%0, %2, lsl #2]    @ in" #fnsuffix                 \
 167         : "=&r" (temp), "=r" (value)                                            \
 168         : "r" (port), "Ir" (PCIO_BASE - IO_BASE), "Ir" (IO_BASE)                \
 169         : "cc");                                                                \
 170         return (unsigned sz)value;                                              \
 171 }
 172
 173 static inline unsigned int __ioaddr (unsigned int port)                 \
 174 {                                                                               \
 175         if (__PORT_PCIO(port))                                                  \
 176                 return (unsigned int)(PCIO_BASE + (port << 2));                 \
 177         else                                                                    \
 178                 return (unsigned int)(IO_BASE + (port << 2));                   \
 179 }
 180
 181 #define DECLARE_IO(sz,fnsuffix,instr)   \
 182         DECLARE_DYN_IN(sz,fnsuffix,instr)
 183
 184 DECLARE_IO(char,b,"b")
 185 DECLARE_IO(short,w,"")
 186 DECLARE_IO(int,l,"")
 187
 188 #undef DECLARE_IO
 189 #undef DECLARE_DYN_IN
 190
 191 /*
 192  * Constant address IO functions
 193  *
 194  * These have to be macros for the 'J' constraint to work -
 195  * +/-4096 immediate operand.
 196  */
 197 #define __outbc(value,port)                                                     \
 198 ({                                                                              \
 199         if (__PORT_PCIO((port)))                                                \
 200                 __asm__ __volatile__(                                           \
 201                 "strb   %0, [%1, %2]    @ outbc"                                \
 202                 : : "r" (value), "r" (PCIO_BASE), "Jr" ((port) << 2));          \
 203         else                                                                    \
 204                 __asm__ __volatile__(                                           \
 205                 "strb   %0, [%1, %2]    @ outbc"                                \
 206                 : : "r" (value), "r" (IO_BASE), "r" ((port) << 2));             \
 207 })
 208
 209 #define __inbc(port)                                                            \
 210 ({                                                                              \
 211         unsigned char result;                                                   \
 212         if (__PORT_PCIO((port)))                                                \
 213                 __asm__ __volatile__(                                           \
 214                 "ldrb   %0, [%1, %2]    @ inbc"                                 \
 215                 : "=r" (result) : "r" (PCIO_BASE), "Jr" ((port) << 2));         \
 216         else                                                                    \
 217                 __asm__ __volatile__(                                           \
 218                 "ldrb   %0, [%1, %2]    @ inbc"                                 \
 219                 : "=r" (result) : "r" (IO_BASE), "r" ((port) << 2));            \
 220         result;                                                                 \
 221 })
 222
 223 #define __outwc(value,port)                                                     \
 224 ({                                                                              \
 225         unsigned long v = value;                                                \
 226         if (__PORT_PCIO((port)))                                                \
 227                 __asm__ __volatile__(                                           \
 228                 "str    %0, [%1, %2]    @ outwc"                                \
 229                 : : "r" (v|v<<16), "r" (PCIO_BASE), "Jr" ((port) << 2));        \
 230         else                                                                    \
 231                 __asm__ __volatile__(                                           \
 232                 "str    %0, [%1, %2]    @ outwc"                                \
 233                 : : "r" (v|v<<16), "r" (IO_BASE), "r" ((port) << 2));           \
 234 })
 235
 236 #define __inwc(port)                                                            \
 237 ({                                                                              \
 238         unsigned short result;                                                  \
 239         if (__PORT_PCIO((port)))                                                \
 240                 __asm__ __volatile__(                                           \
 241                 "ldr    %0, [%1, %2]    @ inwc"                                 \
 242                 : "=r" (result) : "r" (PCIO_BASE), "Jr" ((port) << 2));         \
 243         else                                                                    \
 244                 __asm__ __volatile__(                                           \
 245                 "ldr    %0, [%1, %2]    @ inwc"                                 \
 246                 : "=r" (result) : "r" (IO_BASE), "r" ((port) << 2));            \
 247         result & 0xffff;                                                        \
 248 })
 249
 250 #define __outlc(value,port)                                                     \
 251 ({                                                                              \
 252         unsigned long v = value;                                                \
 253         if (__PORT_PCIO((port)))                                                \
 254                 __asm__ __volatile__(                                           \
 255                 "str    %0, [%1, %2]    @ outlc"                                \
 256                 : : "r" (v), "r" (PCIO_BASE), "Jr" ((port) << 2));              \
 257         else                                                                    \
 258                 __asm__ __volatile__(                                           \
 259                 "str    %0, [%1, %2]    @ outlc"                                \
 260                 : : "r" (v), "r" (IO_BASE), "r" ((port) << 2));                 \
 261 })
 262
 263 #define __inlc(port)                                                            \
 264 ({                                                                              \
 265         unsigned long result;                                                   \
 266         if (__PORT_PCIO((port)))                                                \
 267                 __asm__ __volatile__(                                           \
 268                 "ldr    %0, [%1, %2]    @ inlc"                                 \
 269                 : "=r" (result) : "r" (PCIO_BASE), "Jr" ((port) << 2));         \
 270         else                                                                    \
 271                 __asm__ __volatile__(                                           \
 272                 "ldr    %0, [%1, %2]    @ inlc"                                 \
 273                 : "=r" (result) : "r" (IO_BASE), "r" ((port) << 2));            \
 274         result;                                                                 \
 275 })
 276
 277 #define __ioaddrc(port)                                                         \
 278 ({                                                                              \
 279         unsigned long addr;                                                     \
 280         if (__PORT_PCIO((port)))                                                \
 281                 addr = PCIO_BASE + ((port) << 2);                               \
 282         else                                                                    \
 283                 addr = IO_BASE + ((port) << 2);                                 \
 284         addr;                                                                   \
 285 })
 286
 287 #define inb(p)          (__builtin_constant_p((p)) ? __inbc(p)    : __inb(p))
 288 #define inw(p)          (__builtin_constant_p((p)) ? __inwc(p)    : __inw(p))
 289 #define inl(p)          (__builtin_constant_p((p)) ? __inlc(p)    : __inl(p))
 290 #define outb(v,p)       (__builtin_constant_p((p)) ? __outbc(v,p) : __outb(v,p))
 291 #define outw(v,p)       (__builtin_constant_p((p)) ? __outwc(v,p) : __outw(v,p))
 292 #define outl(v,p)       (__builtin_constant_p((p)) ? __outlc(v,p) : __outl(v,p))
 293 #define __ioaddr(p)     (__builtin_constant_p((p)) ? __ioaddr(p)  : __ioaddrc(p))
 294
 295 /* JMA 18.02.03 added sb,sl from arm/io.h, changing io to ioaddr */
 296
 297 #define outsb(p,d,l)            __raw_writesb(__ioaddr(p),d,l)
 298 #define outsw(p,d,l)            __raw_writesw(__ioaddr(p),d,l)
 299 #define outsl(p,d,l)            __raw_writesl(__ioaddr(p),d,l)
 300
 301 #define insb(p,d,l)             __raw_readsb(__ioaddr(p),d,l)
 302 #define insw(p,d,l)             __raw_readsw(__ioaddr(p),d,l)
 303 #define insl(p,d,l)             __raw_readsl(__ioaddr(p),d,l)
 304
 305 #define insw(p,d,l)     __raw_readsw(__ioaddr(p),d,l)
 306 #define outsw(p,d,l)    __raw_writesw(__ioaddr(p),d,l)
 307
 308 #define readb(c)                        (__readwrite_bug("readb"),0)
 309 #define readw(c)                        (__readwrite_bug("readw"),0)
 310 #define readl(c)                        (__readwrite_bug("readl"),0)
 311 #define readb_relaxed(addr)             readb(addr)
 312 #define readw_relaxed(addr)             readw(addr)
 313 #define readl_relaxed(addr)             readl(addr)
 314 #define writeb(v,c)                     __readwrite_bug("writeb")
 315 #define writew(v,c)                     __readwrite_bug("writew")
 316 #define writel(v,c)                     __readwrite_bug("writel")
 317
 318 #define readsw(p,d,l)                 (__readwrite_bug("readsw"),0)
 319 #define readsl(p,d,l)                 (__readwrite_bug("readsl"),0)
 320 #define writesw(p,d,l)                        __readwrite_bug("writesw")
 321 #define writesl(p,d,l)                        __readwrite_bug("writesl")
 322
 323 #define mmiowb()
 324
 325 /* the following macro is depreciated */
 326 #define ioaddr(port)                    __ioaddr((port))
 327
 328 /*
 329  * No ioremap support here.
 330  */
 331 #define __arch_ioremap(c,s,f,a)   ((void *)(c))
 332 #define __arch_iounmap(c)       do { }  while (0)
 333
 334
 335 #if defined(__arch_putb) || defined(__arch_putw) || defined(__arch_putl) || \
 336     defined(__arch_getb) || defined(__arch_getw) || defined(__arch_getl)
 337 #warning machine class uses old __arch_putw or __arch_getw
 338 #endif
 339
 340 /*
 341  *  IO port access primitives
 342  *  -------------------------
 343  *
 344  * The ARM doesn't have special IO access instructions; all IO is memory
 345  * mapped.  Note that these are defined to perform little endian accesses
 346  * only.  Their primary purpose is to access PCI and ISA peripherals.
 347  *
 348  * Note that for a big endian machine, this implies that the following
 349  * big endian mode connectivity is in place, as described by numerious
 350  * ARM documents:
 351  *
 352  *    PCI:  D0-D7   D8-D15 D16-D23 D24-D31
 353  *    ARM: D24-D31 D16-D23  D8-D15  D0-D7
 354  *
 355  * The machine specific io.h include defines __io to translate an "IO"
 356  * address to a memory address.
 357  *
 358  * Note that we prevent GCC re-ordering or caching values in expressions
 359  * by introducing sequence points into the in*() definitions.  Note that
 360  * __raw_* do not guarantee this behaviour.
 361  */
 362 /*
 363 #define outsb(p,d,l)            __raw_writesb(__io(p),d,l)
 364 #define outsw(p,d,l)            __raw_writesw(__io(p),d,l)
 365
 366 #define insb(p,d,l)             __raw_readsb(__io(p),d,l)
 367 #define insw(p,d,l)             __raw_readsw(__io(p),d,l)
 368 */
 369 #define outb_p(val,port)        outb((val),(port))
 370 #define outw_p(val,port)        outw((val),(port))
 371 #define inb_p(port)             inb((port))
 372 #define inw_p(port)             inw((port))
 373 #define inl_p(port)             inl((port))
 374
 375 #define outsb_p(port,from,len)  outsb(port,from,len)
 376 #define outsw_p(port,from,len)  outsw(port,from,len)
 377 #define insb_p(port,to,len)     insb(port,to,len)
 378 #define insw_p(port,to,len)     insw(port,to,len)
 379
 380 /*
 381  * String version of IO memory access ops:
 382  */
 383 extern void _memcpy_fromio(void *, unsigned long, size_t);
 384 extern void _memcpy_toio(unsigned long, const void *, size_t);
 385 extern void _memset_io(unsigned long, int, size_t);
 386
 387 /*
 388  * ioremap and friends.
 389  *
 390  * ioremap takes a PCI memory address, as specified in
 391  * Documentation/IO-mapping.txt.
 392  */
 393 extern void * __ioremap(unsigned long, size_t, unsigned long, unsigned long);
 394 extern void __iounmap(void *addr);
 395
 396 #ifndef __arch_ioremap
 397 #define ioremap(cookie,size)            __ioremap(cookie,size,0,1)
 398 #define ioremap_nocache(cookie,size)    __ioremap(cookie,size,0,1)
 399 #define iounmap(cookie)                 __iounmap(cookie)
 400 #else
 401 #define ioremap(cookie,size)            __arch_ioremap((cookie),(size),0,1)
 402 #define ioremap_nocache(cookie,size)    __arch_ioremap((cookie),(size),0,1)
 403 #define iounmap(cookie)                 __arch_iounmap(cookie)
 404 #endif
 405
 406 /*
 407  * DMA-consistent mapping functions.  These allocate/free a region of
 408  * uncached, unwrite-buffered mapped memory space for use with DMA
 409  * devices.  This is the "generic" version.  The PCI specific version
 410  * is in pci.h
 411  */
 412 extern void *consistent_alloc(int gfp, size_t size, dma_addr_t *handle);
 413 extern void consistent_free(void *vaddr, size_t size, dma_addr_t handle);
 414 extern void consistent_sync(void *vaddr, size_t size, int rw);
 415
 416 /*
 417  * can the hardware map this into one segment or not, given no other
 418  * constraints.
 419  */
 420 #define BIOVEC_MERGEABLE(vec1, vec2)    \
 421         ((bvec_to_phys((vec1)) + (vec1)->bv_len) == bvec_to_phys((vec2)))
 422
 423 /*
 424  * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 425  * access
 426  */
 427 #define xlate_dev_mem_ptr(p)    __va(p)
 428
 429 /*
 430  * Convert a virtual cached pointer to an uncached pointer
 431  */
 432 #define xlate_dev_kmem_ptr(p)   p
 433
 434 #endif  /* __KERNEL__ */
 435 #endif  /* __ASM_ARM_IO_H */