Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * pmu.c, Power Management Unit routines for NEC VR4100 series. | |
3 | * | |
ada8e951 | 4 | * Copyright (C) 2003-2007 Yoichi Yuasa <yuasa@linux-mips.org> |
1da177e4 LT |
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 | */ | |
3407c0fe | 20 | #include <linux/errno.h> |
1da177e4 | 21 | #include <linux/init.h> |
3407c0fe | 22 | #include <linux/ioport.h> |
1da177e4 | 23 | #include <linux/kernel.h> |
fcdb27ad | 24 | #include <linux/pm.h> |
61a33168 | 25 | #include <linux/sched.h> |
1da177e4 LT |
26 | #include <linux/types.h> |
27 | ||
2f2a2d99 | 28 | #include <asm/cacheflush.h> |
1da177e4 LT |
29 | #include <asm/cpu.h> |
30 | #include <asm/io.h> | |
61a33168 | 31 | #include <asm/processor.h> |
1da177e4 | 32 | #include <asm/reboot.h> |
1da177e4 | 33 | |
3407c0fe YY |
34 | #define PMU_TYPE1_BASE 0x0b0000a0UL |
35 | #define PMU_TYPE1_SIZE 0x0eUL | |
36 | ||
37 | #define PMU_TYPE2_BASE 0x0f0000c0UL | |
38 | #define PMU_TYPE2_SIZE 0x10UL | |
39 | ||
40 | #define PMUCNT2REG 0x06 | |
1da177e4 LT |
41 | #define SOFTRST 0x0010 |
42 | ||
3407c0fe YY |
43 | static void __iomem *pmu_base; |
44 | ||
45 | #define pmu_read(offset) readw(pmu_base + (offset)) | |
46 | #define pmu_write(offset, value) writew((value), pmu_base + (offset)) | |
47 | ||
61a33168 YY |
48 | static void vr41xx_cpu_wait(void) |
49 | { | |
50 | local_irq_disable(); | |
51 | if (!need_resched()) | |
52 | /* | |
53 | * "standby" sets IE bit of the CP0_STATUS to 1. | |
54 | */ | |
55 | __asm__("standby;\n"); | |
56 | else | |
57 | local_irq_enable(); | |
58 | } | |
59 | ||
1da177e4 LT |
60 | static inline void software_reset(void) |
61 | { | |
3407c0fe | 62 | uint16_t pmucnt2; |
1da177e4 | 63 | |
10cc3529 | 64 | switch (current_cpu_type()) { |
1da177e4 LT |
65 | case CPU_VR4122: |
66 | case CPU_VR4131: | |
67 | case CPU_VR4133: | |
3407c0fe YY |
68 | pmucnt2 = pmu_read(PMUCNT2REG); |
69 | pmucnt2 |= SOFTRST; | |
70 | pmu_write(PMUCNT2REG, pmucnt2); | |
1da177e4 LT |
71 | break; |
72 | default: | |
2f2a2d99 YY |
73 | set_c0_status(ST0_BEV | ST0_ERL); |
74 | change_c0_config(CONF_CM_CMASK, CONF_CM_UNCACHED); | |
75 | flush_cache_all(); | |
76 | write_c0_wired(0); | |
70342287 | 77 | __asm__("jr %0"::"r"(0xbfc00000)); |
1da177e4 LT |
78 | break; |
79 | } | |
80 | } | |
81 | ||
82 | static void vr41xx_restart(char *command) | |
83 | { | |
84 | local_irq_disable(); | |
85 | software_reset(); | |
1da177e4 LT |
86 | while (1) ; |
87 | } | |
88 | ||
89 | static void vr41xx_halt(void) | |
90 | { | |
91 | local_irq_disable(); | |
92 | printk(KERN_NOTICE "\nYou can turn off the power supply\n"); | |
fa417806 | 93 | __asm__("hibernate;\n"); |
1da177e4 LT |
94 | } |
95 | ||
96 | static int __init vr41xx_pmu_init(void) | |
97 | { | |
3407c0fe YY |
98 | unsigned long start, size; |
99 | ||
10cc3529 | 100 | switch (current_cpu_type()) { |
3407c0fe YY |
101 | case CPU_VR4111: |
102 | case CPU_VR4121: | |
103 | start = PMU_TYPE1_BASE; | |
104 | size = PMU_TYPE1_SIZE; | |
105 | break; | |
106 | case CPU_VR4122: | |
107 | case CPU_VR4131: | |
108 | case CPU_VR4133: | |
109 | start = PMU_TYPE2_BASE; | |
110 | size = PMU_TYPE2_SIZE; | |
111 | break; | |
112 | default: | |
113 | printk("Unexpected CPU of NEC VR4100 series\n"); | |
114 | return -ENODEV; | |
115 | } | |
116 | ||
117 | if (request_mem_region(start, size, "PMU") == NULL) | |
118 | return -EBUSY; | |
119 | ||
120 | pmu_base = ioremap(start, size); | |
121 | if (pmu_base == NULL) { | |
122 | release_mem_region(start, size); | |
123 | return -EBUSY; | |
124 | } | |
125 | ||
61a33168 | 126 | cpu_wait = vr41xx_cpu_wait; |
1da177e4 LT |
127 | _machine_restart = vr41xx_restart; |
128 | _machine_halt = vr41xx_halt; | |
fa417806 | 129 | pm_power_off = vr41xx_halt; |
1da177e4 LT |
130 | |
131 | return 0; | |
132 | } | |
133 | ||
3407c0fe | 134 | core_initcall(vr41xx_pmu_init); |