root/include/asm-mips/io.h

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INCLUDED FROM


DEFINITIONS

This source file includes following definitions.
  1. virt_to_phys
  2. phys_to_virt

   1 #ifndef __ASM_MIPS_IO_H
   2 #define __ASM_MIPS_IO_H
   3 
   4 #include <asm/mipsconfig.h>
   5 #include <asm/segment.h>
   6 
   7 /*
   8  * This file contains the definitions for the MIPS counterpart of the
   9  * x86 in/out instructions. This heap of macros and C results in much
  10  * better code than the approach of doing it in plain C, though that's
  11  * probably not needed.
  12  *
  13  *   Ralf
  14  *
  15  * This file contains the definitions for the x86 IO instructions
  16  * inb/inw/inl/outb/outw/outl and the "string versions" of the same
  17  * (insb/insw/insl/outsb/outsw/outsl). You can also use "pausing"
  18  * versions of the single-IO instructions (inb_p/inw_p/..).
  19  *
  20  * This file is not meant to be obfuscating: it's just complicated
  21  * to (a) handle it all in a way that makes gcc able to optimize it
  22  * as well as possible and (b) trying to avoid writing the same thing
  23  * over and over again with slight variations and possibly making a
  24  * mistake somewhere.
  25  */
  26 
  27 /*
  28  * Thanks to James van Artsdalen for a better timing-fix than
  29  * the two short jumps: using outb's to a nonexistent port seems
  30  * to guarantee better timings even on fast machines.
  31  *
  32  * On the other hand, I'd like to be sure of a non-existent port:
  33  * I feel a bit unsafe about using 0x80 (should be safe, though)
  34  *
  35  *              Linus
  36  */
  37 
  38 #define __SLOW_DOWN_IO \
  39         __asm__ __volatile__( \
  40                 "sb\t$0,0x80(%0)" \
  41                 : : "r" (PORT_BASE));
  42 
  43 #ifdef REALLY_SLOW_IO
  44 #define SLOW_DOWN_IO { __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; __SLOW_DOWN_IO; }
  45 #else
  46 #define SLOW_DOWN_IO __SLOW_DOWN_IO
  47 #endif
  48 
  49 /*
  50  * Change virtual addresses to physical addresses and vv.
  51  * These are trivial on the 1:1 Linux/MIPS mapping
  52  */
  53 extern inline unsigned long virt_to_phys(volatile void * address)
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  54 {
  55         return (unsigned long) address - KSEG0;
  56 }
  57 
  58 extern inline void * phys_to_virt(unsigned long address)
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  59 {
  60         return (void *) address + KSEG0;
  61 }
  62 
  63 /*
  64  * IO bus memory addresses are also 1:1 with the physical address
  65  * FIXME: This assumption is wrong for the Deskstation Tyne
  66  */
  67 #define virt_to_bus virt_to_phys
  68 #define bus_to_virt phys_to_virt
  69 
  70 /*
  71  * readX/writeX() are used to access memory mapped devices. On some
  72  * architectures the memory mapped IO stuff needs to be accessed
  73  * differently. On the x86 architecture, we just read/write the
  74  * memory location directly.
  75  */
  76 #define readb(addr) (*(volatile unsigned char *) (addr))
  77 #define readw(addr) (*(volatile unsigned short *) (addr))
  78 #define readl(addr) (*(volatile unsigned int *) (addr))
  79 
  80 #define writeb(b,addr) ((*(volatile unsigned char *) (addr)) = (b))
  81 #define writew(b,addr) ((*(volatile unsigned short *) (addr)) = (b))
  82 #define writel(b,addr) ((*(volatile unsigned int *) (addr)) = (b))
  83 
  84 #define memset_io(a,b,c)        memset((void *)(a),(b),(c))
  85 #define memcpy_fromio(a,b,c)    memcpy((a),(void *)(b),(c))
  86 #define memcpy_toio(a,b,c)      memcpy((void *)(a),(b),(c))
  87 
  88 /*
  89  * Again, MIPS does not require mem IO specific function.
  90  */
  91 
  92 #define eth_io_copy_and_sum(a,b,c,d)    eth_copy_and_sum((a),(void *)(b),(c),(d))
  93 
  94 /*
  95  * Talk about misusing macros..
  96  */
  97 
  98 #define __OUT1(s) \
  99 extern inline void __out##s(unsigned int value, unsigned int port) {
 100 
 101 #define __OUT2(m) \
 102 __asm__ __volatile__ ("s" #m "\t%0,%1(%2)"
 103 
 104 #define __OUT(m,s) \
 105 __OUT1(s) __OUT2(m) : : "r" (value), "i" (0), "r" (PORT_BASE+port)); } \
 106 __OUT1(s##c) __OUT2(m) : : "r" (value), "ir" (port), "r" (PORT_BASE)); } \
 107 __OUT1(s##_p) __OUT2(m) : : "r" (value), "i" (0), "r" (PORT_BASE+port)); \
 108         SLOW_DOWN_IO; } \
 109 __OUT1(s##c_p) __OUT2(m) : : "r" (value), "ir" (port), "r" (PORT_BASE)); \
 110         SLOW_DOWN_IO; }
 111 
 112 #define __IN1(t,s) \
 113 extern __inline__ t __in##s(unsigned int port) { t _v;
 114 
 115 /*
 116  * Useless nops will be removed by the assembler
 117  */
 118 #define __IN2(m) \
 119 __asm__ __volatile__ ("l" #m "u\t%0,%1(%2)\n\tnop"
 120 
 121 #define __IN(t,m,s) \
 122 __IN1(t,s) __IN2(m) : "=r" (_v) : "i" (0), "r" (PORT_BASE+port)); return _v; } \
 123 __IN1(t,s##c) __IN2(m) : "=r" (_v) : "ir" (port), "r" (PORT_BASE)); return _v; } \
 124 __IN1(t,s##_p) __IN2(m) : "=r" (_v) : "i" (0), "r" (PORT_BASE+port)); SLOW_DOWN_IO; return _v; } \
 125 __IN1(t,s##c_p) __IN2(m) : "=r" (_v) : "ir" (port), "r" (PORT_BASE)); SLOW_DOWN_IO; return _v; }
 126 
 127 #define __INS1(s) \
 128 extern inline void __ins##s(unsigned int port, void * addr, unsigned long count) {
 129 
 130 #define __INS2(m) \
 131 __asm__ __volatile__ ( \
 132         ".set\tnoreorder\n\t" \
 133         ".set\tnoat\n" \
 134         "1:\tl" #m "u\t$1,%4(%5)\n\t" \
 135         "subu\t%1,1\n\t" \
 136         "s" #m "\t$1,(%0)\n\t" \
 137         "bne\t$0,%1,1b\n\t" \
 138         "addiu\t%0,%6\n\t" \
 139         ".set\tat\n\t" \
 140         ".set\treorder"
 141 
 142 #define __INS(m,s,i) \
 143 __INS1(s) __INS2(m) \
 144         : "=r" (addr), "=r" (count) \
 145         : "0" (addr), "1" (count), "i" (0), "r" (PORT_BASE+port), "I" (i) \
 146         : "$1");} \
 147 __INS1(s##c) __INS2(m) \
 148         : "=r" (addr), "=r" (count) \
 149         : "0" (addr), "1" (count), "ir" (port), "r" (PORT_BASE), "I" (i) \
 150         : "$1");}
 151 
 152 #define __OUTS1(s) \
 153 extern inline void __outs##s(unsigned int port, const void * addr, unsigned long count) {
 154 
 155 #define __OUTS2(m) \
 156 __asm__ __volatile__ ( \
 157         ".set\tnoreorder\n\t" \
 158         ".set\tnoat\n" \
 159         "1:\tl" #m "u\t$1,(%0)\n\t" \
 160         "subu\t%1,%1,1\n\t" \
 161         "s" #m "\t$1,%4(%5)\n\t" \
 162         "bne\t$0,%1,1b\n\t" \
 163         "addiu\t%0,%0,%6\n\t" \
 164         ".set\tat\n\t" \
 165         ".set\treorder"
 166 
 167 #define __OUTS(m,s,i) \
 168 __OUTS1(s) __OUTS2(m) \
 169         : "=r" (addr), "=r" (count) \
 170         : "0" (addr), "1" (count), "i" (0), "r" (PORT_BASE+port), "I" (i) \
 171         : "$1");} \
 172 __OUTS1(s##c) __OUTS2(m) \
 173         : "=r" (addr), "=r" (count) \
 174         : "0" (addr), "1" (count), "ir" (port), "r" (PORT_BASE), "I" (i) \
 175         : "$1");}
 176 
 177 __IN(unsigned char,b,b)
 178 __IN(unsigned short,h,w)
 179 __IN(unsigned int,w,l)
 180 
 181 __OUT(b,b)
 182 __OUT(h,w)
 183 __OUT(w,l)
 184 
 185 __INS(b,b,1)
 186 __INS(h,w,2)
 187 __INS(w,l,4)
 188 
 189 __OUTS(b,b,1)
 190 __OUTS(h,w,2)
 191 __OUTS(w,l,4)
 192 
 193 /*
 194  * Note that due to the way __builtin_constant_p() works, you
 195  *  - can't use it inside a inline function (it will never be true)
 196  *  - you don't have to worry about side effects within the __builtin..
 197  */
 198 #define outb(val,port) \
 199 ((__builtin_constant_p((port)) && (port) < 32768) ? \
 200         __outbc((val),(port)) : \
 201         __outb((val),(port)))
 202 
 203 #define inb(port) \
 204 ((__builtin_constant_p((port)) && (port) < 32768) ? \
 205         __inbc(port) : \
 206         __inb(port))
 207 
 208 #define outb_p(val,port) \
 209 ((__builtin_constant_p((port)) && (port) < 32768) ? \
 210         __outbc_p((val),(port)) : \
 211         __outb_p((val),(port)))
 212 
 213 #define inb_p(port) \
 214 ((__builtin_constant_p((port)) && (port) < 32768) ? \
 215         __inbc_p(port) : \
 216         __inb_p(port))
 217 
 218 #define outw(val,port) \
 219 ((__builtin_constant_p((port)) && (port) < 32768) ? \
 220         __outwc((val),(port)) : \
 221         __outw((val),(port)))
 222 
 223 #define inw(port) \
 224 ((__builtin_constant_p((port)) && (port) < 32768) ? \
 225         __inwc(port) : \
 226         __inw(port))
 227 
 228 #define outw_p(val,port) \
 229 ((__builtin_constant_p((port)) && (port) < 32768) ? \
 230         __outwc_p((val),(port)) : \
 231         __outw_p((val),(port)))
 232 
 233 #define inw_p(port) \
 234 ((__builtin_constant_p((port)) && (port) < 32768) ? \
 235         __inwc_p(port) : \
 236         __inw_p(port))
 237 
 238 #define outl(val,port) \
 239 ((__builtin_constant_p((port)) && (port) < 32768) ? \
 240         __outlc((val),(port)) : \
 241         __outl((val),(port)))
 242 
 243 #define inl(port) \
 244 ((__builtin_constant_p((port)) && (port) < 32768) ? \
 245         __inlc(port) : \
 246         __inl(port))
 247 
 248 #define outl_p(val,port) \
 249 ((__builtin_constant_p((port)) && (port) < 32768) ? \
 250         __outlc_p((val),(port)) : \
 251         __outl_p((val),(port)))
 252 
 253 #define inl_p(port) \
 254 ((__builtin_constant_p((port)) && (port) < 32768) ? \
 255         __inlc_p(port) : \
 256         __inl_p(port))
 257 
 258 
 259 #define outsb(port,addr,count) \
 260 ((__builtin_constant_p((port)) && (port) < 32768) ? \
 261         __outsbc((port),(addr),(count)) : \
 262         __outsb ((port),(addr),(count)))
 263 
 264 #define insb(port,addr,count) \
 265 ((__builtin_constant_p((port)) && (port) < 32768) ? \
 266         __insbc((port),(addr),(count)) : \
 267         __insb((port),(addr),(count)))
 268 
 269 #define outsw(port,addr,count) \
 270 ((__builtin_constant_p((port)) && (port) < 32768) ? \
 271         __outswc((port),(addr),(count)) : \
 272         __outsw ((port),(addr),(count)))
 273 
 274 #define insw(port,addr,count) \
 275 ((__builtin_constant_p((port)) && (port) < 32768) ? \
 276         __inswc((port),(addr),(count)) : \
 277         __insw((port),(addr),(count)))
 278 
 279 #define outsl(port,addr,count) \
 280 ((__builtin_constant_p((port)) && (port) < 32768) ? \
 281         __outslc((port),(addr),(count)) : \
 282         __outsl ((port),(addr),(count)))
 283 
 284 #define insl(port,addr,count) \
 285 ((__builtin_constant_p((port)) && (port) < 32768) ? \
 286         __inslc((port),(addr),(count)) : \
 287         __insl((port),(addr),(count)))
 288 
 289 #endif /* __ASM_MIPS_IO_H */

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