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
omap_pm_setup_oscillator(u32 tstart,u32 tshut)57 void omap_pm_setup_oscillator(u32 tstart, u32 tshut)
58 {
59 oscillator.startup_time = tstart;
60 oscillator.shutdown_time = tshut;
61 }
62
omap_pm_get_oscillator(u32 * tstart,u32 * tshut)63 void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
64 {
65 if (!tstart || !tshut)
66 return;
67
68 *tstart = oscillator.startup_time;
69 *tshut = oscillator.shutdown_time;
70 }
71 #endif
72
omap_pm_clkdms_setup(struct clockdomain * clkdm,void * unused)73 int omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
74 {
75 clkdm_allow_idle(clkdm);
76 return 0;
77 }
78
79 #ifdef CONFIG_SUSPEND
omap_pm_enter(suspend_state_t suspend_state)80 static int omap_pm_enter(suspend_state_t suspend_state)
81 {
82 int ret = 0;
83
84 if (!omap_pm_suspend)
85 return -ENOENT; /* XXX doublecheck */
86
87 switch (suspend_state) {
88 case PM_SUSPEND_MEM:
89 ret = omap_pm_suspend();
90 break;
91 default:
92 ret = -EINVAL;
93 }
94
95 return ret;
96 }
97
omap_pm_begin(suspend_state_t state)98 static int omap_pm_begin(suspend_state_t state)
99 {
100 cpu_idle_poll_ctrl(true);
101 if (soc_is_omap34xx())
102 omap_prcm_irq_prepare();
103 return 0;
104 }
105
omap_pm_end(void)106 static void omap_pm_end(void)
107 {
108 cpu_idle_poll_ctrl(false);
109 }
110
omap_pm_wake(void)111 static void omap_pm_wake(void)
112 {
113 if (soc_is_omap34xx())
114 omap_prcm_irq_complete();
115 }
116
117 static const struct platform_suspend_ops omap_pm_ops = {
118 .begin = omap_pm_begin,
119 .end = omap_pm_end,
120 .enter = omap_pm_enter,
121 .wake = omap_pm_wake,
122 .valid = suspend_valid_only_mem,
123 };
124
125 /**
126 * omap_common_suspend_init - Set common suspend routines for OMAP SoCs
127 * @pm_suspend: function pointer to SoC specific suspend function
128 */
omap_common_suspend_init(void * pm_suspend)129 void omap_common_suspend_init(void *pm_suspend)
130 {
131 omap_pm_suspend = pm_suspend;
132 suspend_set_ops(&omap_pm_ops);
133 }
134 #endif /* CONFIG_SUSPEND */
135
omap_pm_nop_init(void)136 int __maybe_unused omap_pm_nop_init(void)
137 {
138 return 0;
139 }
140
141 int (*omap_pm_soc_init)(void);
142
omap2_common_pm_late_init(void)143 int __init omap2_common_pm_late_init(void)
144 {
145 int error;
146
147 if (!omap_pm_soc_init)
148 return 0;
149
150 /* Init the voltage layer */
151 omap3_twl_init();
152 omap4_twl_init();
153 omap4_cpcap_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