target/linux/ifxmips/files/arch/mips/ifxmips/pmu.c

   1 /*
   2  *   This program is free software; you can redistribute it and/or modify
   3  *   it under the terms of the GNU General Public License as published by
   4  *   the Free Software Foundation; either version 2 of the License, or
   5  *   (at your option) any later version.
   6  *
   7  *   This program is distributed in the hope that it will be useful,
   8  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  *   GNU General Public License for more details.
  11  *
  12  *   You should have received a copy of the GNU General Public License
  13  *   along with this program; if not, write to the Free Software
  14  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  15  *
  16  *   Copyright (C) 2007 John Crispin <blogic@openwrt.org>
  17  *
  18  *       code used for handling the power management unit of the danube. using
  19  *       the pmu we can turn the power of the seperate ip cores on/off.
  20  */
  21
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/version.h>
  25
  26 #include <ifxmips.h>
  27
  28 void ifxmips_pmu_enable(unsigned int module)
  29 {
  30         int err = 1000000;
  31
  32         ifxmips_w32(ifxmips_r32(IFXMIPS_PMU_PWDCR) & ~module,
  33                 IFXMIPS_PMU_PWDCR);
  34         while (--err && (ifxmips_r32(IFXMIPS_PMU_PWDSR) & module))
  35                 ;
  36
  37         if (!err)
  38                 panic("activating PMU module failed!");
  39 }
  40 EXPORT_SYMBOL(ifxmips_pmu_enable);
  41
  42 void ifxmips_pmu_disable(unsigned int module)
  43 {
  44         ifxmips_w32(ifxmips_r32(IFXMIPS_PMU_PWDCR) | module, IFXMIPS_PMU_PWDCR);
  45 }
  46 EXPORT_SYMBOL(ifxmips_pmu_disable);