arch/sh/kernel/io.c

   1 /*
   2  * arch/sh/kernel/io.c - Machine independent I/O functions.
   3  *
   4  * Copyright (C) 2000 - 2009  Stuart Menefy
   5  * Copyright (C) 2005  Paul Mundt
   6  *
   7  * This file is subject to the terms and conditions of the GNU General Public
   8  * License.  See the file "COPYING" in the main directory of this archive
   9  * for more details.
  10  */
  11 #include <linux/module.h>
  12 #include <linux/pci.h>
  13 #include <asm/machvec.h>
  14 #include <asm/io.h>
  15
  16 /*
  17  * Copy data from IO memory space to "real" memory space.
  18  */
  19 void memcpy_fromio(void *to, const volatile void __iomem *from, unsigned long count)
  20 {
  21         /*
  22          * Would it be worthwhile doing byte and long transfers first
  23          * to try and get aligned?
  24          */
  25 #ifdef CONFIG_CPU_SH4
  26         if ((count >= 0x20) &&
  27              (((u32)to & 0x1f) == 0) && (((u32)from & 0x3) == 0)) {
  28                 int tmp2, tmp3, tmp4, tmp5, tmp6;
  29
  30                 __asm__ __volatile__(
  31                         "1:                     \n\t"
  32                         "mov.l  @%7+, r0        \n\t"
  33                         "mov.l  @%7+, %2        \n\t"
  34                         "movca.l r0, @%0        \n\t"
  35                         "mov.l  @%7+, %3        \n\t"
  36                         "mov.l  @%7+, %4        \n\t"
  37                         "mov.l  @%7+, %5        \n\t"
  38                         "mov.l  @%7+, %6        \n\t"
  39                         "mov.l  @%7+, r7        \n\t"
  40                         "mov.l  @%7+, r0        \n\t"
  41                         "mov.l  %2, @(0x04,%0)  \n\t"
  42                         "mov    #0x20, %2       \n\t"
  43                         "mov.l  %3, @(0x08,%0)  \n\t"
  44                         "sub    %2, %1          \n\t"
  45                         "mov.l  %4, @(0x0c,%0)  \n\t"
  46                         "cmp/hi %1, %2          ! T if 32 > count       \n\t"
  47                         "mov.l  %5, @(0x10,%0)  \n\t"
  48                         "mov.l  %6, @(0x14,%0)  \n\t"
  49                         "mov.l  r7, @(0x18,%0)  \n\t"
  50                         "mov.l  r0, @(0x1c,%0)  \n\t"
  51                         "bf.s   1b              \n\t"
  52                         " add   #0x20, %0       \n\t"
  53                         : "=&r" (to), "=&r" (count),
  54                           "=&r" (tmp2), "=&r" (tmp3), "=&r" (tmp4),
  55                           "=&r" (tmp5), "=&r" (tmp6), "=&r" (from)
  56                         : "7"(from), "0" (to), "1" (count)
  57                         : "r0", "r7", "t", "memory");
  58         }
  59 #endif
  60
  61         if ((((u32)to | (u32)from) & 0x3) == 0) {
  62                 for (; count > 3; count -= 4) {
  63                         *(u32 *)to = *(volatile u32 *)from;
  64                         to += 4;
  65                         from += 4;
  66                 }
  67         }
  68
  69         for (; count > 0; count--) {
  70                 *(u8 *)to = *(volatile u8 *)from;
  71                 to++;
  72                 from++;
  73         }
  74
  75         mb();
  76 }
  77 EXPORT_SYMBOL(memcpy_fromio);
  78
  79 /*
  80  * Copy data from "real" memory space to IO memory space.
  81  */
  82 void memcpy_toio(volatile void __iomem *to, const void *from, unsigned long count)
  83 {
  84         if ((((u32)to | (u32)from) & 0x3) == 0) {
  85                 for ( ; count > 3; count -= 4) {
  86                         *(volatile u32 *)to = *(u32 *)from;
  87                         to += 4;
  88                         from += 4;
  89                 }
  90         }
  91
  92         for (; count > 0; count--) {
  93                 *(volatile u8 *)to = *(u8 *)from;
  94                 to++;
  95                 from++;
  96         }
  97
  98         mb();
  99 }
 100 EXPORT_SYMBOL(memcpy_toio);
 101
 102 /*
 103  * "memset" on IO memory space.
 104  * This needs to be optimized.
 105  */
 106 void memset_io(volatile void __iomem *dst, int c, unsigned long count)
 107 {
 108         while (count) {
 109                 count--;
 110                 writeb(c, dst);
 111                 dst++;
 112         }
 113 }
 114 EXPORT_SYMBOL(memset_io);