xref: /kernel/linux/linux-5.10/arch/arm/mach-omap2/pm.c (revision 8c2ecf20) 
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
31u32 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 */
38static 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 */
47struct omap2_oscillator {
48	u32 startup_time;
49	u32 shutdown_time;
50};
51
52static struct omap2_oscillator oscillator = {
53	.startup_time = ULONG_MAX,
54	.shutdown_time = ULONG_MAX,
55};
56
57void omap_pm_setup_oscillator(u32 tstart, u32 tshut)
58{
59	oscillator.startup_time = tstart;
60	oscillator.shutdown_time = tshut;
61}
62
63void 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
73int omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
74{
75	clkdm_allow_idle(clkdm);
76	return 0;
77}
78
79#ifdef CONFIG_SUSPEND
80static 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
98static 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
106static void omap_pm_end(void)
107{
108	cpu_idle_poll_ctrl(false);
109}
110
111static void omap_pm_wake(void)
112{
113	if (soc_is_omap34xx())
114		omap_prcm_irq_complete();
115}
116
117static 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 */
129void 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
136int __maybe_unused omap_pm_nop_init(void)
137{
138	return 0;
139}
140
141int (*omap_pm_soc_init)(void);
142
143int __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}
167omap_late_initcall(omap2_common_pm_late_init);
168