2 * pmu.c, Power Management Unit routines for NEC VR4100 series.
4 * Copyright (C) 2003-2005 Yoichi Yuasa <yuasa@hh.iij4u.or.jp>
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.
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.
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
20 #include <linux/errno.h>
21 #include <linux/init.h>
22 #include <linux/ioport.h>
23 #include <linux/kernel.h>
24 #include <linux/smp.h>
25 #include <linux/types.h>
29 #include <asm/reboot.h>
30 #include <asm/system.h>
32 #define PMU_TYPE1_BASE 0x0b0000a0UL
33 #define PMU_TYPE1_SIZE 0x0eUL
35 #define PMU_TYPE2_BASE 0x0f0000c0UL
36 #define PMU_TYPE2_SIZE 0x10UL
38 #define PMUCNT2REG 0x06
39 #define SOFTRST 0x0010
41 static void __iomem *pmu_base;
43 #define pmu_read(offset) readw(pmu_base + (offset))
44 #define pmu_write(offset, value) writew((value), pmu_base + (offset))
46 static inline void software_reset(void)
50 switch (current_cpu_data.cputype) {
54 pmucnt2 = pmu_read(PMUCNT2REG);
56 pmu_write(PMUCNT2REG, pmucnt2);
63 static void vr41xx_restart(char *command)
67 printk(KERN_NOTICE "\nYou can reset your system\n");
71 static void vr41xx_halt(void)
74 printk(KERN_NOTICE "\nYou can turn off the power supply\n");
78 static void vr41xx_power_off(void)
81 printk(KERN_NOTICE "\nYou can turn off the power supply\n");
85 static int __init vr41xx_pmu_init(void)
87 unsigned long start, size;
89 switch (current_cpu_data.cputype) {
92 start = PMU_TYPE1_BASE;
93 size = PMU_TYPE1_SIZE;
98 start = PMU_TYPE2_BASE;
99 size = PMU_TYPE2_SIZE;
102 printk("Unexpected CPU of NEC VR4100 series\n");
106 if (request_mem_region(start, size, "PMU") == NULL)
109 pmu_base = ioremap(start, size);
110 if (pmu_base == NULL) {
111 release_mem_region(start, size);
115 _machine_restart = vr41xx_restart;
116 _machine_halt = vr41xx_halt;
117 _machine_power_off = vr41xx_power_off;
122 core_initcall(vr41xx_pmu_init);