1 /*
2 * pm.c - Common OMAP2+ power management-related code
3 *
4 * Copyright (C) 2010 Texas Instruments, Inc.
5 * Copyright (C) 2010 Nokia Corporation
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/io.h>
15 #include <linux/err.h>
16 #include <linux/pm_opp.h>
17 #include <linux/export.h>
18 #include <linux/suspend.h>
19 #include <linux/clk.h>
20 #include <linux/cpu.h>
21
22 #include <asm/system_misc.h>
23
24 #include "omap_device.h"
25 #include "common.h"
26
27 #include "soc.h"
28 #include "prcm-common.h"
29 #include "voltage.h"
30 #include "powerdomain.h"
31 #include "clockdomain.h"
32 #include "pm.h"
33
34 #ifdef CONFIG_SUSPEND
35 /*
36 * omap_pm_suspend: points to a function that does the SoC-specific
37 * suspend work
38 */
39 static int (*omap_pm_suspend)(void);
40 #endif
41
42 #ifdef CONFIG_PM
43 /**
44 * struct omap2_oscillator - Describe the board main oscillator latencies
45 * @startup_time: oscillator startup latency
46 * @shutdown_time: oscillator shutdown latency
47 */
48 struct omap2_oscillator {
49 u32 startup_time;
50 u32 shutdown_time;
51 };
52
53 static struct omap2_oscillator oscillator = {
54 .startup_time = ULONG_MAX,
55 .shutdown_time = ULONG_MAX,
56 };
57
omap_pm_setup_oscillator(u32 tstart,u32 tshut)58 void omap_pm_setup_oscillator(u32 tstart, u32 tshut)
59 {
60 oscillator.startup_time = tstart;
61 oscillator.shutdown_time = tshut;
62 }
63
omap_pm_get_oscillator(u32 * tstart,u32 * tshut)64 void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
65 {
66 if (!tstart || !tshut)
67 return;
68
69 *tstart = oscillator.startup_time;
70 *tshut = oscillator.shutdown_time;
71 }
72 #endif
73
omap_pm_clkdms_setup(struct clockdomain * clkdm,void * unused)74 int omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
75 {
76 clkdm_allow_idle(clkdm);
77 return 0;
78 }
79
80 #ifdef CONFIG_SUSPEND
omap_pm_enter(suspend_state_t suspend_state)81 static int omap_pm_enter(suspend_state_t suspend_state)
82 {
83 int ret = 0;
84
85 if (!omap_pm_suspend)
86 return -ENOENT; /* XXX doublecheck */
87
88 switch (suspend_state) {
89 case PM_SUSPEND_MEM:
90 ret = omap_pm_suspend();
91 break;
92 default:
93 ret = -EINVAL;
94 }
95
96 return ret;
97 }
98
omap_pm_begin(suspend_state_t state)99 static int omap_pm_begin(suspend_state_t state)
100 {
101 cpu_idle_poll_ctrl(true);
102 if (soc_is_omap34xx())
103 omap_prcm_irq_prepare();
104 return 0;
105 }
106
omap_pm_end(void)107 static void omap_pm_end(void)
108 {
109 cpu_idle_poll_ctrl(false);
110 }
111
omap_pm_wake(void)112 static void omap_pm_wake(void)
113 {
114 if (soc_is_omap34xx())
115 omap_prcm_irq_complete();
116 }
117
118 static const struct platform_suspend_ops omap_pm_ops = {
119 .begin = omap_pm_begin,
120 .end = omap_pm_end,
121 .enter = omap_pm_enter,
122 .wake = omap_pm_wake,
123 .valid = suspend_valid_only_mem,
124 };
125
126 /**
127 * omap_common_suspend_init - Set common suspend routines for OMAP SoCs
128 * @pm_suspend: function pointer to SoC specific suspend function
129 */
omap_common_suspend_init(void * pm_suspend)130 void omap_common_suspend_init(void *pm_suspend)
131 {
132 omap_pm_suspend = pm_suspend;
133 suspend_set_ops(&omap_pm_ops);
134 }
135 #endif /* CONFIG_SUSPEND */
136
omap_pm_nop_init(void)137 int __maybe_unused omap_pm_nop_init(void)
138 {
139 return 0;
140 }
141
142 int (*omap_pm_soc_init)(void);
143
omap2_common_pm_late_init(void)144 int __init omap2_common_pm_late_init(void)
145 {
146 int error;
147
148 if (!omap_pm_soc_init)
149 return 0;
150
151 /* Init the voltage layer */
152 omap3_twl_init();
153 omap4_twl_init();
154 omap_voltage_late_init();
155
156 /* Smartreflex device init */
157 omap_devinit_smartreflex();
158
159 error = omap_pm_soc_init();
160 if (error)
161 pr_warn("%s: pm soc init failed: %i\n", __func__, error);
162
163 omap2_clk_enable_autoidle_all();
164
165 return 0;
166 }
167 omap_late_initcall(omap2_common_pm_late_init);
168