release/src-rt-6.x.4708/linux/linux-2.6.36/arch/sh/lib/io.c

   1 /*
   2  * arch/sh/lib/io.c - SH32 optimized I/O routines
   3  *
   4  * Copyright (C) 2000  Stuart Menefy
   5  * Copyright (C) 2005  Paul Mundt
   6  *
   7  * Provide real functions which expand to whatever the header file defined.
   8  * Also definitions of machine independent IO functions.
   9  *
  10  * This file is subject to the terms and conditions of the GNU General Public
  11  * License.  See the file "COPYING" in the main directory of this archive
  12  * for more details.
  13  */
  14 #include <linux/module.h>
  15 #include <linux/io.h>
  16
  17 void __raw_readsl(const void __iomem *addr, void *datap, int len)
  18 {
  19         u32 *data;
  20
  21         for (data = datap; (len != 0) && (((u32)data & 0x1f) != 0); len--)
  22                 *data++ = __raw_readl(addr);
  23
  24         if (likely(len >= (0x20 >> 2))) {
  25                 int tmp2, tmp3, tmp4, tmp5, tmp6;
  26
  27                 __asm__ __volatile__(
  28                         "1:                     \n\t"
  29                         "mov.l  @%7, r0         \n\t"
  30                         "mov.l  @%7, %2         \n\t"
  31 #ifdef CONFIG_CPU_SH4
  32                         "movca.l r0, @%0        \n\t"
  33 #else
  34                         "mov.l  r0, @%0         \n\t"
  35 #endif
  36                         "mov.l  @%7, %3         \n\t"
  37                         "mov.l  @%7, %4         \n\t"
  38                         "mov.l  @%7, %5         \n\t"
  39                         "mov.l  @%7, %6         \n\t"
  40                         "mov.l  @%7, r7         \n\t"
  41                         "mov.l  @%7, r0         \n\t"
  42                         "mov.l  %2, @(0x04,%0)  \n\t"
  43                         "mov    #0x20>>2, %2    \n\t"
  44                         "mov.l  %3, @(0x08,%0)  \n\t"
  45                         "sub    %2, %1          \n\t"
  46                         "mov.l  %4, @(0x0c,%0)  \n\t"
  47                         "cmp/hi %1, %2          ! T if 32 > len \n\t"
  48                         "mov.l  %5, @(0x10,%0)  \n\t"
  49                         "mov.l  %6, @(0x14,%0)  \n\t"
  50                         "mov.l  r7, @(0x18,%0)  \n\t"
  51                         "mov.l  r0, @(0x1c,%0)  \n\t"
  52                         "bf.s   1b              \n\t"
  53                         " add   #0x20, %0       \n\t"
  54                         : "=&r" (data), "=&r" (len),
  55                           "=&r" (tmp2), "=&r" (tmp3), "=&r" (tmp4),
  56                           "=&r" (tmp5), "=&r" (tmp6)
  57                         : "r"(addr), "0" (data), "1" (len)
  58                         : "r0", "r7", "t", "memory");
  59         }
  60
  61         for (; len != 0; len--)
  62                 *data++ = __raw_readl(addr);
  63 }
  64 EXPORT_SYMBOL(__raw_readsl);
  65
  66 void __raw_writesl(void __iomem *addr, const void *data, int len)
  67 {
  68         if (likely(len != 0)) {
  69                 int tmp1;
  70
  71                 __asm__ __volatile__ (
  72                         "1:                             \n\t"
  73                         "mov.l  @%0+, %1        \n\t"
  74                         "dt             %3              \n\t"
  75                         "bf.s           1b              \n\t"
  76                         " mov.l %1, @%4         \n\t"
  77                         : "=&r" (data), "=&r" (tmp1)
  78                         : "0" (data), "r" (len), "r"(addr)
  79                         : "t", "memory");
  80         }
  81 }
  82 EXPORT_SYMBOL(__raw_writesl);