arch/powerpc/kernel/io.c

   1 /*
   2  * I/O string operations
   3  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
   4  *    Copyright (C) 2006 IBM Corporation
   5  *
   6  * Largely rewritten by Cort Dougan (cort@cs.nmt.edu)
   7  * and Paul Mackerras.
   8  *
   9  * Adapted for iSeries by Mike Corrigan (mikejc@us.ibm.com)
  10  * PPC64 updates by Dave Engebretsen (engebret@us.ibm.com)
  11  *
  12  * Rewritten in C by Stephen Rothwell.
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License
  16  * as published by the Free Software Foundation; either version
  17  * 2 of the License, or (at your option) any later version.
  18  */
  19 #include <linux/kernel.h>
  20 #include <linux/types.h>
  21 #include <linux/compiler.h>
  22 #include <linux/module.h>
  23
  24 #include <asm/io.h>
  25 #include <asm/firmware.h>
  26 #include <asm/bug.h>
  27
  28 void _insb(const volatile u8 __iomem *port, void *buf, long count)
  29 {
  30         u8 *tbuf = buf;
  31         u8 tmp;
  32
  33         if (unlikely(count <= 0))
  34                 return;
  35         asm volatile("sync");
  36         do {
  37                 tmp = *port;
  38                 eieio();
  39                 *tbuf++ = tmp;
  40         } while (--count != 0);
  41         asm volatile("twi 0,%0,0; isync" : : "r" (tmp));
  42 }
  43 EXPORT_SYMBOL(_insb);
  44
  45 void _outsb(volatile u8 __iomem *port, const void *buf, long count)
  46 {
  47         const u8 *tbuf = buf;
  48
  49         if (unlikely(count <= 0))
  50                 return;
  51         asm volatile("sync");
  52         do {
  53                 *port = *tbuf++;
  54         } while (--count != 0);
  55         asm volatile("sync");
  56 }
  57 EXPORT_SYMBOL(_outsb);
  58
  59 void _insw_ns(const volatile u16 __iomem *port, void *buf, long count)
  60 {
  61         u16 *tbuf = buf;
  62         u16 tmp;
  63
  64         if (unlikely(count <= 0))
  65                 return;
  66         asm volatile("sync");
  67         do {
  68                 tmp = *port;
  69                 eieio();
  70                 *tbuf++ = tmp;
  71         } while (--count != 0);
  72         asm volatile("twi 0,%0,0; isync" : : "r" (tmp));
  73 }
  74 EXPORT_SYMBOL(_insw_ns);
  75
  76 void _outsw_ns(volatile u16 __iomem *port, const void *buf, long count)
  77 {
  78         const u16 *tbuf = buf;
  79
  80         if (unlikely(count <= 0))
  81                 return;
  82         asm volatile("sync");
  83         do {
  84                 *port = *tbuf++;
  85         } while (--count != 0);
  86         asm volatile("sync");
  87 }
  88 EXPORT_SYMBOL(_outsw_ns);
  89
  90 void _insl_ns(const volatile u32 __iomem *port, void *buf, long count)
  91 {
  92         u32 *tbuf = buf;
  93         u32 tmp;
  94
  95         if (unlikely(count <= 0))
  96                 return;
  97         asm volatile("sync");
  98         do {
  99                 tmp = *port;
 100                 eieio();
 101                 *tbuf++ = tmp;
 102         } while (--count != 0);
 103         asm volatile("twi 0,%0,0; isync" : : "r" (tmp));
 104 }
 105 EXPORT_SYMBOL(_insl_ns);
 106
 107 void _outsl_ns(volatile u32 __iomem *port, const void *buf, long count)
 108 {
 109         const u32 *tbuf = buf;
 110
 111         if (unlikely(count <= 0))
 112                 return;
 113         asm volatile("sync");
 114         do {
 115                 *port = *tbuf++;
 116         } while (--count != 0);
 117         asm volatile("sync");
 118 }
 119 EXPORT_SYMBOL(_outsl_ns);
 120
 121 #define IO_CHECK_ALIGN(v,a) ((((unsigned long)(v)) & ((a) - 1)) == 0)
 122
 123 void _memset_io(volatile void __iomem *addr, int c, unsigned long n)
 124 {
 125         void *p = (void __force *)addr;
 126         u32 lc = c;
 127         lc |= lc << 8;
 128         lc |= lc << 16;
 129
 130         __asm__ __volatile__ ("sync" : : : "memory");
 131         while(n && !IO_CHECK_ALIGN(p, 4)) {
 132                 *((volatile u8 *)p) = c;
 133                 p++;
 134                 n--;
 135         }
 136         while(n >= 4) {
 137                 *((volatile u32 *)p) = lc;
 138                 p += 4;
 139                 n -= 4;
 140         }
 141         while(n) {
 142                 *((volatile u8 *)p) = c;
 143                 p++;
 144                 n--;
 145         }
 146         __asm__ __volatile__ ("sync" : : : "memory");
 147 }
 148 EXPORT_SYMBOL(_memset_io);
 149
 150 void _memcpy_fromio(void *dest, const volatile void __iomem *src,
 151                     unsigned long n)
 152 {
 153         void *vsrc = (void __force *) src;
 154
 155         __asm__ __volatile__ ("sync" : : : "memory");
 156         while(n && (!IO_CHECK_ALIGN(vsrc, 4) || !IO_CHECK_ALIGN(dest, 4))) {
 157                 *((u8 *)dest) = *((volatile u8 *)vsrc);
 158                 eieio();
 159                 vsrc++;
 160                 dest++;
 161                 n--;
 162         }
 163         while(n > 4) {
 164                 *((u32 *)dest) = *((volatile u32 *)vsrc);
 165                 eieio();
 166                 vsrc += 4;
 167                 dest += 4;
 168                 n -= 4;
 169         }
 170         while(n) {
 171                 *((u8 *)dest) = *((volatile u8 *)vsrc);
 172                 eieio();
 173                 vsrc++;
 174                 dest++;
 175                 n--;
 176         }
 177         __asm__ __volatile__ ("sync" : : : "memory");
 178 }
 179 EXPORT_SYMBOL(_memcpy_fromio);
 180
 181 void _memcpy_toio(volatile void __iomem *dest, const void *src, unsigned long n)
 182 {
 183         void *vdest = (void __force *) dest;
 184
 185         __asm__ __volatile__ ("sync" : : : "memory");
 186         while(n && (!IO_CHECK_ALIGN(vdest, 4) || !IO_CHECK_ALIGN(src, 4))) {
 187                 *((volatile u8 *)vdest) = *((u8 *)src);
 188                 src++;
 189                 vdest++;
 190                 n--;
 191         }
 192         while(n > 4) {
 193                 *((volatile u32 *)vdest) = *((volatile u32 *)src);
 194                 src += 4;
 195                 vdest += 4;
 196                 n-=4;
 197         }
 198         while(n) {
 199                 *((volatile u8 *)vdest) = *((u8 *)src);
 200                 src++;
 201                 vdest++;
 202                 n--;
 203         }
 204         __asm__ __volatile__ ("sync" : : : "memory");
 205 }
 206 EXPORT_SYMBOL(_memcpy_toio);