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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_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
67int omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
68{
69 clkdm_allow_idle(clkdm);
70 return 0;
71}
72
73#ifdef CONFIG_SUSPEND
74static 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
92static 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
100static void omap_pm_end(void)
101{
102 cpu_idle_poll_ctrl(false);
103}
104
105static void omap_pm_wake(void)
106{
107 if (soc_is_omap34xx())
108 omap_prcm_irq_complete();
109}
110
111static 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 */
123void 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
130int __maybe_unused omap_pm_nop_init(void)
131{
132 return 0;
133}
134
135int (*omap_pm_soc_init)(void);
136
137static 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}
161omap_late_initcall(omap2_common_pm_late_init);
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/cpu.h>
20
21#include <asm/system_misc.h>
22
23#include "omap-pm.h"
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#include "twl-common.h"
34
35#ifdef CONFIG_SUSPEND
36/*
37 * omap_pm_suspend: points to a function that does the SoC-specific
38 * suspend work
39 */
40static int (*omap_pm_suspend)(void);
41#endif
42
43#ifdef CONFIG_PM
44/**
45 * struct omap2_oscillator - Describe the board main oscillator latencies
46 * @startup_time: oscillator startup latency
47 * @shutdown_time: oscillator shutdown latency
48 */
49struct omap2_oscillator {
50 u32 startup_time;
51 u32 shutdown_time;
52};
53
54static struct omap2_oscillator oscillator = {
55 .startup_time = ULONG_MAX,
56 .shutdown_time = ULONG_MAX,
57};
58
59void omap_pm_setup_oscillator(u32 tstart, u32 tshut)
60{
61 oscillator.startup_time = tstart;
62 oscillator.shutdown_time = tshut;
63}
64
65void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
66{
67 if (!tstart || !tshut)
68 return;
69
70 *tstart = oscillator.startup_time;
71 *tshut = oscillator.shutdown_time;
72}
73#endif
74
75static int __init _init_omap_device(char *name)
76{
77 struct omap_hwmod *oh;
78 struct platform_device *pdev;
79
80 oh = omap_hwmod_lookup(name);
81 if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
82 __func__, name))
83 return -ENODEV;
84
85 pdev = omap_device_build(oh->name, 0, oh, NULL, 0);
86 if (WARN(IS_ERR(pdev), "%s: could not build omap_device for %s\n",
87 __func__, name))
88 return -ENODEV;
89
90 return 0;
91}
92
93/*
94 * Build omap_devices for processors and bus.
95 */
96static void __init omap2_init_processor_devices(void)
97{
98 _init_omap_device("mpu");
99 if (omap3_has_iva())
100 _init_omap_device("iva");
101
102 if (cpu_is_omap44xx()) {
103 _init_omap_device("l3_main_1");
104 _init_omap_device("dsp");
105 _init_omap_device("iva");
106 } else {
107 _init_omap_device("l3_main");
108 }
109}
110
111int __init omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
112{
113 /* XXX The usecount test is racy */
114 if ((clkdm->flags & CLKDM_CAN_ENABLE_AUTO) &&
115 !(clkdm->flags & CLKDM_MISSING_IDLE_REPORTING))
116 clkdm_allow_idle(clkdm);
117 else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
118 clkdm->usecount == 0)
119 clkdm_sleep(clkdm);
120 return 0;
121}
122
123/*
124 * This API is to be called during init to set the various voltage
125 * domains to the voltage as per the opp table. Typically we boot up
126 * at the nominal voltage. So this function finds out the rate of
127 * the clock associated with the voltage domain, finds out the correct
128 * opp entry and sets the voltage domain to the voltage specified
129 * in the opp entry
130 */
131static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
132 const char *oh_name)
133{
134 struct voltagedomain *voltdm;
135 struct clk *clk;
136 struct dev_pm_opp *opp;
137 unsigned long freq, bootup_volt;
138 struct device *dev;
139
140 if (!vdd_name || !clk_name || !oh_name) {
141 pr_err("%s: invalid parameters\n", __func__);
142 goto exit;
143 }
144
145 if (!strncmp(oh_name, "mpu", 3))
146 /*
147 * All current OMAPs share voltage rail and clock
148 * source, so CPU0 is used to represent the MPU-SS.
149 */
150 dev = get_cpu_device(0);
151 else
152 dev = omap_device_get_by_hwmod_name(oh_name);
153
154 if (IS_ERR(dev)) {
155 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
156 __func__, oh_name);
157 goto exit;
158 }
159
160 voltdm = voltdm_lookup(vdd_name);
161 if (!voltdm) {
162 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
163 __func__, vdd_name);
164 goto exit;
165 }
166
167 clk = clk_get(NULL, clk_name);
168 if (IS_ERR(clk)) {
169 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
170 goto exit;
171 }
172
173 freq = clk_get_rate(clk);
174 clk_put(clk);
175
176 rcu_read_lock();
177 opp = dev_pm_opp_find_freq_ceil(dev, &freq);
178 if (IS_ERR(opp)) {
179 rcu_read_unlock();
180 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
181 __func__, vdd_name);
182 goto exit;
183 }
184
185 bootup_volt = dev_pm_opp_get_voltage(opp);
186 rcu_read_unlock();
187 if (!bootup_volt) {
188 pr_err("%s: unable to find voltage corresponding to the bootup OPP for vdd_%s\n",
189 __func__, vdd_name);
190 goto exit;
191 }
192
193 voltdm_scale(voltdm, bootup_volt);
194 return 0;
195
196exit:
197 pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
198 return -EINVAL;
199}
200
201#ifdef CONFIG_SUSPEND
202static int omap_pm_enter(suspend_state_t suspend_state)
203{
204 int ret = 0;
205
206 if (!omap_pm_suspend)
207 return -ENOENT; /* XXX doublecheck */
208
209 switch (suspend_state) {
210 case PM_SUSPEND_STANDBY:
211 case PM_SUSPEND_MEM:
212 ret = omap_pm_suspend();
213 break;
214 default:
215 ret = -EINVAL;
216 }
217
218 return ret;
219}
220
221static int omap_pm_begin(suspend_state_t state)
222{
223 cpu_idle_poll_ctrl(true);
224 if (cpu_is_omap34xx())
225 omap_prcm_irq_prepare();
226 return 0;
227}
228
229static void omap_pm_end(void)
230{
231 cpu_idle_poll_ctrl(false);
232}
233
234static void omap_pm_finish(void)
235{
236 if (cpu_is_omap34xx())
237 omap_prcm_irq_complete();
238}
239
240static const struct platform_suspend_ops omap_pm_ops = {
241 .begin = omap_pm_begin,
242 .end = omap_pm_end,
243 .enter = omap_pm_enter,
244 .finish = omap_pm_finish,
245 .valid = suspend_valid_only_mem,
246};
247
248/**
249 * omap_common_suspend_init - Set common suspend routines for OMAP SoCs
250 * @pm_suspend: function pointer to SoC specific suspend function
251 */
252void omap_common_suspend_init(void *pm_suspend)
253{
254 omap_pm_suspend = pm_suspend;
255 suspend_set_ops(&omap_pm_ops);
256}
257#endif /* CONFIG_SUSPEND */
258
259static void __init omap3_init_voltages(void)
260{
261 if (!cpu_is_omap34xx())
262 return;
263
264 omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
265 omap2_set_init_voltage("core", "l3_ick", "l3_main");
266}
267
268static void __init omap4_init_voltages(void)
269{
270 if (!cpu_is_omap44xx())
271 return;
272
273 omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
274 omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
275 omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
276}
277
278static inline void omap_init_cpufreq(void)
279{
280 struct platform_device_info devinfo = { };
281
282 if (!of_have_populated_dt())
283 devinfo.name = "omap-cpufreq";
284 else
285 devinfo.name = "cpufreq-dt";
286 platform_device_register_full(&devinfo);
287}
288
289static int __init omap2_common_pm_init(void)
290{
291 if (!of_have_populated_dt())
292 omap2_init_processor_devices();
293 omap_pm_if_init();
294
295 return 0;
296}
297omap_postcore_initcall(omap2_common_pm_init);
298
299int __init omap2_common_pm_late_init(void)
300{
301 if (of_have_populated_dt()) {
302 omap3_twl_init();
303 omap4_twl_init();
304 }
305
306 /* Init the voltage layer */
307 omap_pmic_late_init();
308 omap_voltage_late_init();
309
310 /* Initialize the voltages */
311 omap3_init_voltages();
312 omap4_init_voltages();
313
314 /* Smartreflex device init */
315 omap_devinit_smartreflex();
316
317 /* cpufreq dummy device instantiation */
318 omap_init_cpufreq();
319
320 return 0;
321}