arch/sh/lib/io.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * arch/sh/lib/io.c - SH32 optimized I/O routines
   4  *
   5  * Copyright (C) 2000  Stuart Menefy
   6  * Copyright (C) 2005  Paul Mundt
   7  *
   8  * Provide real functions which expand to whatever the header file defined.
   9  * Also definitions of machine independent IO functions.
  10  */
  11 #include <linux/module.h>
  12 #include <linux/io.h>
  13
  14 void __raw_readsl(const void __iomem *addr, void *datap, int len)
  15 {
  16         u32 *data;
  17
  18         for (data = datap; (len != 0) && (((u32)data & 0x1f) != 0); len--)
  19                 *data++ = __raw_readl(addr);
  20
  21         if (likely(len >= (0x20 >> 2))) {
  22                 int tmp2, tmp3, tmp4, tmp5, tmp6;
  23
  24                 __asm__ __volatile__(
  25                         "1:                     \n\t"
  26                         "mov.l  @%7, r0         \n\t"
  27                         "mov.l  @%7, %2         \n\t"
  28 #ifdef CONFIG_CPU_SH4
  29                         "movca.l r0, @%0        \n\t"
  30 #else
  31                         "mov.l  r0, @%0         \n\t"
  32 #endif
  33                         "mov.l  @%7, %3         \n\t"
  34                         "mov.l  @%7, %4         \n\t"
  35                         "mov.l  @%7, %5         \n\t"
  36                         "mov.l  @%7, %6         \n\t"
  37                         "mov.l  @%7, r7         \n\t"
  38                         "mov.l  @%7, r0         \n\t"
  39                         "mov.l  %2, @(0x04,%0)  \n\t"
  40                         "mov    #0x20>>2, %2    \n\t"
  41                         "mov.l  %3, @(0x08,%0)  \n\t"
  42                         "sub    %2, %1          \n\t"
  43                         "mov.l  %4, @(0x0c,%0)  \n\t"
  44                         "cmp/hi %1, %2          ! T if 32 > len \n\t"
  45                         "mov.l  %5, @(0x10,%0)  \n\t"
  46                         "mov.l  %6, @(0x14,%0)  \n\t"
  47                         "mov.l  r7, @(0x18,%0)  \n\t"
  48                         "mov.l  r0, @(0x1c,%0)  \n\t"
  49                         "bf.s   1b              \n\t"
  50                         " add   #0x20, %0       \n\t"
  51                         : "=&r" (data), "=&r" (len),
  52                           "=&r" (tmp2), "=&r" (tmp3), "=&r" (tmp4),
  53                           "=&r" (tmp5), "=&r" (tmp6)
  54                         : "r"(addr), "0" (data), "1" (len)
  55                         : "r0", "r7", "t", "memory");
  56         }
  57
  58         for (; len != 0; len--)
  59                 *data++ = __raw_readl(addr);
  60 }
  61 EXPORT_SYMBOL(__raw_readsl);
  62
  63 void __raw_writesl(void __iomem *addr, const void *data, int len)
  64 {
  65         if (likely(len != 0)) {
  66                 int tmp1;
  67
  68                 __asm__ __volatile__ (
  69                         "1:                             \n\t"
  70                         "mov.l  @%0+, %1        \n\t"
  71                         "dt             %3              \n\t"
  72                         "bf.s           1b              \n\t"
  73                         " mov.l %1, @%4         \n\t"
  74                         : "=&r" (data), "=&r" (tmp1)
  75                         : "0" (data), "r" (len), "r"(addr)
  76                         : "t", "memory");
  77         }
  78 }
  79 EXPORT_SYMBOL(__raw_writesl);