arch/mips/vr41xx/common/pmu.c

   1 /*
   2  *  pmu.c, Power Management Unit routines for NEC VR4100 series.
   3  *
   4  *  Copyright (C) 2003-2005  Yoichi Yuasa <yoichi_yuasa@tripeaks.co.jp>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with this program; if not, write to the Free Software
  18  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 #include <linux/errno.h>
  21 #include <linux/init.h>
  22 #include <linux/ioport.h>
  23 #include <linux/kernel.h>
  24 #include <linux/pm.h>
  25 #include <linux/smp.h>
  26 #include <linux/types.h>
  27
  28 #include <asm/cpu.h>
  29 #include <asm/io.h>
  30 #include <asm/reboot.h>
  31 #include <asm/system.h>
  32
  33 #define PMU_TYPE1_BASE  0x0b0000a0UL
  34 #define PMU_TYPE1_SIZE  0x0eUL
  35
  36 #define PMU_TYPE2_BASE  0x0f0000c0UL
  37 #define PMU_TYPE2_SIZE  0x10UL
  38
  39 #define PMUCNT2REG      0x06
  40  #define SOFTRST        0x0010
  41
  42 static void __iomem *pmu_base;
  43
  44 #define pmu_read(offset)                readw(pmu_base + (offset))
  45 #define pmu_write(offset, value)        writew((value), pmu_base + (offset))
  46
  47 static inline void software_reset(void)
  48 {
  49         uint16_t pmucnt2;
  50
  51         switch (current_cpu_data.cputype) {
  52         case CPU_VR4122:
  53         case CPU_VR4131:
  54         case CPU_VR4133:
  55                 pmucnt2 = pmu_read(PMUCNT2REG);
  56                 pmucnt2 |= SOFTRST;
  57                 pmu_write(PMUCNT2REG, pmucnt2);
  58                 break;
  59         default:
  60                 break;
  61         }
  62 }
  63
  64 static void vr41xx_restart(char *command)
  65 {
  66         local_irq_disable();
  67         software_reset();
  68         printk(KERN_NOTICE "\nYou can reset your system\n");
  69         while (1) ;
  70 }
  71
  72 static void vr41xx_halt(void)
  73 {
  74         local_irq_disable();
  75         printk(KERN_NOTICE "\nYou can turn off the power supply\n");
  76         while (1) ;
  77 }
  78
  79 static void vr41xx_power_off(void)
  80 {
  81         local_irq_disable();
  82         printk(KERN_NOTICE "\nYou can turn off the power supply\n");
  83         while (1) ;
  84 }
  85
  86 static int __init vr41xx_pmu_init(void)
  87 {
  88         unsigned long start, size;
  89
  90         switch (current_cpu_data.cputype) {
  91         case CPU_VR4111:
  92         case CPU_VR4121:
  93                 start = PMU_TYPE1_BASE;
  94                 size = PMU_TYPE1_SIZE;
  95                 break;
  96         case CPU_VR4122:
  97         case CPU_VR4131:
  98         case CPU_VR4133:
  99                 start = PMU_TYPE2_BASE;
 100                 size = PMU_TYPE2_SIZE;
 101                 break;
 102         default:
 103                 printk("Unexpected CPU of NEC VR4100 series\n");
 104                 return -ENODEV;
 105         }
 106
 107         if (request_mem_region(start, size, "PMU") == NULL)
 108                 return -EBUSY;
 109
 110         pmu_base = ioremap(start, size);
 111         if (pmu_base == NULL) {
 112                 release_mem_region(start, size);
 113                 return -EBUSY;
 114         }
 115
 116         _machine_restart = vr41xx_restart;
 117         _machine_halt = vr41xx_halt;
 118         pm_power_off = vr41xx_power_off;
 119
 120         return 0;
 121 }
 122
 123 core_initcall(vr41xx_pmu_init);