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