cpu/sh3/cache.c

   1 /*
   2  * (C) Copyright 2007
   3  * Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
   4  *
   5  * (C) Copyright 2007
   6  * Nobobuhiro Iwamatsu <iwamatsu@nigauri.org>
   7  *
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <common.h>
  28 #include <command.h>
  29 #include <asm/processor.h>
  30 #include <asm/io.h>
  31
  32 /*
  33  * Jump to P2 area.
  34  * When handling TLB or caches, we need to do it from P2 area.
  35  */
  36 #define jump_to_P2()                    \
  37   do {                                    \
  38     unsigned long __dummy;              \
  39     __asm__ __volatile__(                       \
  40                 "mov.l  1f, %0\n\t"     \
  41                 "or     %1, %0\n\t"     \
  42                 "jmp    @%0\n\t"        \
  43                 " nop\n\t"              \
  44                 ".balign 4\n"           \
  45                 "1:     .long 2f\n"     \
  46                 "2:"                    \
  47                 : "=&r" (__dummy)       \
  48                 : "r" (0x20000000));    \
  49   } while (0)
  50
  51 /*
  52  * Back to P1 area.
  53  */
  54 #define back_to_P1()                                    \
  55   do {                                                    \
  56     unsigned long __dummy;                          \
  57     __asm__ __volatile__(                           \
  58                 "nop;nop;nop;nop;nop;nop;nop\n\t"       \
  59                 "mov.l  1f, %0\n\t"                     \
  60                 "jmp    @%0\n\t"                        \
  61                 " nop\n\t"                              \
  62                 ".balign 4\n"                           \
  63                 "1:     .long 2f\n"                     \
  64                 "2:"                                    \
  65                 : "=&r" (__dummy));                     \
  66   } while (0)
  67
  68 #define CACHE_VALID       1
  69 #define CACHE_UPDATED     2
  70
  71 static inline void cache_wback_all(void)
  72 {
  73         unsigned long addr, data, i, j;
  74
  75         jump_to_P2();
  76         for (i = 0; i < CACHE_OC_NUM_ENTRIES; i++) {
  77                 for (j = 0; j < CACHE_OC_NUM_WAYS; j++) {
  78                         addr = CACHE_OC_ADDRESS_ARRAY
  79                                 | (j << CACHE_OC_WAY_SHIFT)
  80                                 | (i << CACHE_OC_ENTRY_SHIFT);
  81                         data = inl(addr);
  82                         if (data & CACHE_UPDATED) {
  83                                 data &= ~CACHE_UPDATED;
  84                                 outl(data, addr);
  85                         }
  86                 }
  87         }
  88         back_to_P1();
  89 }
  90
  91
  92 #define CACHE_ENABLE      0
  93 #define CACHE_DISABLE     1
  94
  95 int cache_control(unsigned int cmd)
  96 {
  97         unsigned long ccr;
  98
  99         jump_to_P2();
 100         ccr = inl(CCR);
 101
 102         if (ccr & CCR_CACHE_ENABLE)
 103                 cache_wback_all();
 104
 105         if (cmd == CACHE_DISABLE)
 106                 outl(CCR_CACHE_STOP, CCR);
 107         else
 108                 outl(CCR_CACHE_INIT, CCR);
 109         back_to_P1();
 110
 111         return 0;
 112 }