post/cpu/ppc4xx/fpu.c

   1 /*
   2  *  Copyright (C) 2007 Wolfgang Denk <wd@denx.de>
   3  *
   4  * See file CREDITS for list of people who contributed to this
   5  * project.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  20  * MA 02111-1307 USA
  21  */
  22
  23 #include <config.h>
  24
  25 #ifdef CONFIG_POST
  26 #if defined(CONFIG_440EP) || \
  27     defined(CONFIG_440EPX)
  28
  29 #include <ppc4xx.h>
  30 #include <asm/processor.h>
  31
  32
  33 int fpu_status(void)
  34 {
  35         if (mfspr(ccr0) & CCR0_DAPUIB)
  36                 return 0; /* Disabled */
  37         else
  38                 return 1; /* Enabled */
  39 }
  40
  41
  42 void fpu_disable(void)
  43 {
  44         mtspr(ccr0, mfspr(ccr0) | CCR0_DAPUIB);
  45         mtmsr(mfmsr() & ~MSR_FP);
  46 }
  47
  48
  49 void fpu_enable(void)
  50 {
  51         mtspr(ccr0, mfspr(ccr0) & ~CCR0_DAPUIB);
  52         mtmsr(mfmsr() | MSR_FP);
  53 }
  54 #endif
  55 #endif