arch/m68k/platform/coldfire/cache.c

   1 /***************************************************************************/
   2
   3 /*
   4  *      cache.c -- general ColdFire Cache maintenance code
   5  *
   6  *      Copyright (C) 2010, Greg Ungerer (gerg@snapgear.com)
   7  */
   8
   9 /***************************************************************************/
  10
  11 #include <linux/kernel.h>
  12 #include <asm/coldfire.h>
  13 #include <asm/mcfsim.h>
  14
  15 /***************************************************************************/
  16 #ifdef CACHE_PUSH
  17 /***************************************************************************/
  18
  19 /*
  20  *      Use cpushl to push all dirty cache lines back to memory.
  21  *      Older versions of GAS don't seem to know how to generate the
  22  *      ColdFire cpushl instruction... Oh well, bit stuff it for now.
  23  */
  24
  25 void mcf_cache_push(void)
  26 {
  27         __asm__ __volatile__ (
  28                 "clrl   %%d0\n\t"
  29                 "1:\n\t"
  30                 "movel  %%d0,%%a0\n\t"
  31                 "2:\n\t"
  32                 ".word  0xf468\n\t"
  33                 "addl   %0,%%a0\n\t"
  34                 "cmpl   %1,%%a0\n\t"
  35                 "blt    2b\n\t"
  36                 "addql  #1,%%d0\n\t"
  37                 "cmpil  %2,%%d0\n\t"
  38                 "bne    1b\n\t"
  39                 : /* No output */
  40                 : "i" (CACHE_LINE_SIZE),
  41                   "i" (DCACHE_SIZE / CACHE_WAYS),
  42                   "i" (CACHE_WAYS)
  43                 : "d0", "a0" );
  44 }
  45
  46 /***************************************************************************/
  47 #endif /* CACHE_PUSH */
  48 /***************************************************************************/