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pmu.c

/*
 *  pmu.c, Power Management Unit routines for NEC VR4100 series.
 *
 *  Copyright (C) 2003-2007  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/pm.h>
#include <linux/sched.h>
#include <linux/types.h>

#include <asm/cacheflush.h>
#include <asm/cpu.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/reboot.h>
#include <asm/system.h>

#define PMU_TYPE1_BASE  0x0b0000a0UL
#define PMU_TYPE1_SIZE  0x0eUL

#define PMU_TYPE2_BASE  0x0f0000c0UL
#define PMU_TYPE2_SIZE  0x10UL

#define PMUCNT2REG      0x06
 #define SOFTRST  0x0010

static void __iomem *pmu_base;

#define pmu_read(offset)            readw(pmu_base + (offset))
#define pmu_write(offset, value)    writew((value), pmu_base + (offset))

static void vr41xx_cpu_wait(void)
{
      local_irq_disable();
      if (!need_resched())
            /*
             * "standby" sets IE bit of the CP0_STATUS to 1.
             */
            __asm__("standby;\n");
      else
            local_irq_enable();
}

static inline void software_reset(void)
{
      uint16_t pmucnt2;

      switch (current_cpu_type()) {
      case CPU_VR4122:
      case CPU_VR4131:
      case CPU_VR4133:
            pmucnt2 = pmu_read(PMUCNT2REG);
            pmucnt2 |= SOFTRST;
            pmu_write(PMUCNT2REG, pmucnt2);
            break;
      default:
            set_c0_status(ST0_BEV | ST0_ERL);
            change_c0_config(CONF_CM_CMASK, CONF_CM_UNCACHED);
            flush_cache_all();
            write_c0_wired(0);
            __asm__("jr     %0"::"r"(0xbfc00000));
            break;
      }
}

static void vr41xx_restart(char *command)
{
      local_irq_disable();
      software_reset();
      while (1) ;
}

static void vr41xx_halt(void)
{
      local_irq_disable();
      printk(KERN_NOTICE "\nYou can turn off the power supply\n");
      __asm__("hibernate;\n");
}

static int __init vr41xx_pmu_init(void)
{
      unsigned long start, size;

      switch (current_cpu_type()) {
      case CPU_VR4111:
      case CPU_VR4121:
            start = PMU_TYPE1_BASE;
            size = PMU_TYPE1_SIZE;
            break;
      case CPU_VR4122:
      case CPU_VR4131:
      case CPU_VR4133:
            start = PMU_TYPE2_BASE;
            size = PMU_TYPE2_SIZE;
            break;
      default:
            printk("Unexpected CPU of NEC VR4100 series\n");
            return -ENODEV;
      }

      if (request_mem_region(start, size, "PMU") == NULL)
            return -EBUSY;

      pmu_base = ioremap(start, size);
      if (pmu_base == NULL) {
            release_mem_region(start, size);
            return -EBUSY;
      }

      cpu_wait = vr41xx_cpu_wait;
      _machine_restart = vr41xx_restart;
      _machine_halt = vr41xx_halt;
      pm_power_off = vr41xx_halt;

      return 0;
}

core_initcall(vr41xx_pmu_init);

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