1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * pm.c - Common OMAP2+ power management-related code
4 *
5 * Copyright (C) 2010 Texas Instruments, Inc.
6 * Copyright (C) 2010 Nokia Corporation
7 */
8
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/io.h>
12 #include <linux/err.h>
13 #include <linux/pm_opp.h>
14 #include <linux/export.h>
15 #include <linux/suspend.h>
16 #include <linux/clk.h>
17 #include <linux/cpu.h>
18
19 #include <asm/system_misc.h>
20
21 #include "omap_device.h"
22 #include "common.h"
23
24 #include "soc.h"
25 #include "prcm-common.h"
26 #include "voltage.h"
27 #include "powerdomain.h"
28 #include "clockdomain.h"
29 #include "pm.h"
30
31 u32 enable_off_mode;
32
33 #ifdef CONFIG_SUSPEND
34 /*
35 * omap_pm_suspend: points to a function that does the SoC-specific
36 * suspend work
37 */
38 static int (*omap_pm_suspend)(void);
39 #endif
40
41 #ifdef CONFIG_PM
42 /**
43 * struct omap2_oscillator - Describe the board main oscillator latencies
44 * @startup_time: oscillator startup latency
45 * @shutdown_time: oscillator shutdown latency
46 */
47 struct omap2_oscillator {
48 u32 startup_time;
49 u32 shutdown_time;
50 };
51
52 static struct omap2_oscillator oscillator = {
53 .startup_time = ULONG_MAX,
54 .shutdown_time = ULONG_MAX,
55 };
56
57 void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
58 {
59 if (!tstart || !tshut)
60 return;
61
62 *tstart = oscillator.startup_time;
63 *tshut = oscillator.shutdown_time;
64 }
65 #endif
66
67 int omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
68 {
69 clkdm_allow_idle(clkdm);
70 return 0;
71 }
72
73 #ifdef CONFIG_SUSPEND
74 static int omap_pm_enter(suspend_state_t suspend_state)
75 {
76 int ret = 0;
77
78 if (!omap_pm_suspend)
79 return -ENOENT; /* XXX doublecheck */
80
81 switch (suspend_state) {
82 case PM_SUSPEND_MEM:
83 ret = omap_pm_suspend();
84 break;
85 default:
86 ret = -EINVAL;
87 }
88
89 return ret;
90 }
91
92 static int omap_pm_begin(suspend_state_t state)
93 {
94 cpu_idle_poll_ctrl(true);
95 if (soc_is_omap34xx())
96 omap_prcm_irq_prepare();
97 return 0;
98 }
99
100 static void omap_pm_end(void)
101 {
102 cpu_idle_poll_ctrl(false);
103 }
104
105 static void omap_pm_wake(void)
106 {
107 if (soc_is_omap34xx())
108 omap_prcm_irq_complete();
109 }
110
111 static const struct platform_suspend_ops omap_pm_ops = {
112 .begin = omap_pm_begin,
113 .end = omap_pm_end,
114 .enter = omap_pm_enter,
115 .wake = omap_pm_wake,
116 .valid = suspend_valid_only_mem,
117 };
118
119 /**
120 * omap_common_suspend_init - Set common suspend routines for OMAP SoCs
121 * @pm_suspend: function pointer to SoC specific suspend function
122 */
123 void omap_common_suspend_init(void *pm_suspend)
124 {
125 omap_pm_suspend = pm_suspend;
126 suspend_set_ops(&omap_pm_ops);
127 }
128 #endif /* CONFIG_SUSPEND */
129
130 int __maybe_unused omap_pm_nop_init(void)
131 {
132 return 0;
133 }
134
135 int (*omap_pm_soc_init)(void);
136
137 static int __init omap2_common_pm_late_init(void)
138 {
139 int error;
140
141 if (!omap_pm_soc_init)
142 return 0;
143
144 /* Init the voltage layer */
145 omap3_twl_init();
146 omap4_twl_init();
147 omap4_cpcap_init();
148 omap_voltage_late_init();
149
150 /* Smartreflex device init */
151 omap_devinit_smartreflex();
152
153 error = omap_pm_soc_init();
154 if (error)
155 pr_warn("%s: pm soc init failed: %i\n", __func__, error);
156
157 omap2_clk_enable_autoidle_all();
158
159 return 0;
160 }
161 omap_late_initcall(omap2_common_pm_late_init);
162
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