arch/sh/mm/pmb-fixed.c

   1 /*
   2  * arch/sh/mm/fixed_pmb.c
   3  *
   4  * Copyright (C) 2009  Renesas Solutions Corp.
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  */
  10 #include <linux/init.h>
  11 #include <linux/mm.h>
  12 #include <linux/io.h>
  13 #include <asm/mmu.h>
  14 #include <asm/mmu_context.h>
  15
  16 static int __uses_jump_to_uncached fixed_pmb_init(void)
  17 {
  18         int i;
  19         unsigned long addr, data;
  20
  21         jump_to_uncached();
  22
  23         for (i = 0; i < PMB_ENTRY_MAX; i++) {
  24                 addr = PMB_DATA + (i << PMB_E_SHIFT);
  25                 data = ctrl_inl(addr);
  26                 if (!(data & PMB_V))
  27                         continue;
  28
  29                 if (data & PMB_C) {
  30 #if defined(CONFIG_CACHE_WRITETHROUGH)
  31                         data |= PMB_WT;
  32 #elif defined(CONFIG_CACHE_WRITEBACK)
  33                         data &= ~PMB_WT;
  34 #else
  35                         data &= ~(PMB_C | PMB_WT);
  36 #endif
  37                 }
  38                 ctrl_outl(data, addr);
  39         }
  40
  41         back_to_cached();
  42
  43         return 0;
  44 }
  45 arch_initcall(fixed_pmb_init);