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
42static 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
47static 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
64static 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
72static 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
79static 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
86static 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
123core_initcall(vr41xx_pmu_init);
124