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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/*
36 * omap_pm_suspend: points to a function that does the SoC-specific
37 * suspend work
38 */
39int (*omap_pm_suspend)(void);
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
73static int __init _init_omap_device(char *name)
74{
75 struct omap_hwmod *oh;
76 struct platform_device *pdev;
77
78 oh = omap_hwmod_lookup(name);
79 if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
80 __func__, name))
81 return -ENODEV;
82
83 pdev = omap_device_build(oh->name, 0, oh, NULL, 0);
84 if (WARN(IS_ERR(pdev), "%s: could not build omap_device for %s\n",
85 __func__, name))
86 return -ENODEV;
87
88 return 0;
89}
90
91/*
92 * Build omap_devices for processors and bus.
93 */
94static void __init omap2_init_processor_devices(void)
95{
96 _init_omap_device("mpu");
97 if (omap3_has_iva())
98 _init_omap_device("iva");
99
100 if (cpu_is_omap44xx()) {
101 _init_omap_device("l3_main_1");
102 _init_omap_device("dsp");
103 _init_omap_device("iva");
104 } else {
105 _init_omap_device("l3_main");
106 }
107}
108
109int __init omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
110{
111 /* XXX The usecount test is racy */
112 if ((clkdm->flags & CLKDM_CAN_ENABLE_AUTO) &&
113 !(clkdm->flags & CLKDM_MISSING_IDLE_REPORTING))
114 clkdm_allow_idle(clkdm);
115 else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
116 clkdm->usecount == 0)
117 clkdm_sleep(clkdm);
118 return 0;
119}
120
121/*
122 * This API is to be called during init to set the various voltage
123 * domains to the voltage as per the opp table. Typically we boot up
124 * at the nominal voltage. So this function finds out the rate of
125 * the clock associated with the voltage domain, finds out the correct
126 * opp entry and sets the voltage domain to the voltage specified
127 * in the opp entry
128 */
129static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
130 const char *oh_name)
131{
132 struct voltagedomain *voltdm;
133 struct clk *clk;
134 struct dev_pm_opp *opp;
135 unsigned long freq, bootup_volt;
136 struct device *dev;
137
138 if (!vdd_name || !clk_name || !oh_name) {
139 pr_err("%s: invalid parameters\n", __func__);
140 goto exit;
141 }
142
143 if (!strncmp(oh_name, "mpu", 3))
144 /*
145 * All current OMAPs share voltage rail and clock
146 * source, so CPU0 is used to represent the MPU-SS.
147 */
148 dev = get_cpu_device(0);
149 else
150 dev = omap_device_get_by_hwmod_name(oh_name);
151
152 if (IS_ERR(dev)) {
153 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
154 __func__, oh_name);
155 goto exit;
156 }
157
158 voltdm = voltdm_lookup(vdd_name);
159 if (!voltdm) {
160 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
161 __func__, vdd_name);
162 goto exit;
163 }
164
165 clk = clk_get(NULL, clk_name);
166 if (IS_ERR(clk)) {
167 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
168 goto exit;
169 }
170
171 freq = clk_get_rate(clk);
172 clk_put(clk);
173
174 rcu_read_lock();
175 opp = dev_pm_opp_find_freq_ceil(dev, &freq);
176 if (IS_ERR(opp)) {
177 rcu_read_unlock();
178 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
179 __func__, vdd_name);
180 goto exit;
181 }
182
183 bootup_volt = dev_pm_opp_get_voltage(opp);
184 rcu_read_unlock();
185 if (!bootup_volt) {
186 pr_err("%s: unable to find voltage corresponding to the bootup OPP for vdd_%s\n",
187 __func__, vdd_name);
188 goto exit;
189 }
190
191 voltdm_scale(voltdm, bootup_volt);
192 return 0;
193
194exit:
195 pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
196 return -EINVAL;
197}
198
199#ifdef CONFIG_SUSPEND
200static int omap_pm_enter(suspend_state_t suspend_state)
201{
202 int ret = 0;
203
204 if (!omap_pm_suspend)
205 return -ENOENT; /* XXX doublecheck */
206
207 switch (suspend_state) {
208 case PM_SUSPEND_STANDBY:
209 case PM_SUSPEND_MEM:
210 ret = omap_pm_suspend();
211 break;
212 default:
213 ret = -EINVAL;
214 }
215
216 return ret;
217}
218
219static int omap_pm_begin(suspend_state_t state)
220{
221 cpu_idle_poll_ctrl(true);
222 if (cpu_is_omap34xx())
223 omap_prcm_irq_prepare();
224 return 0;
225}
226
227static void omap_pm_end(void)
228{
229 cpu_idle_poll_ctrl(false);
230}
231
232static void omap_pm_finish(void)
233{
234 if (cpu_is_omap34xx())
235 omap_prcm_irq_complete();
236}
237
238static const struct platform_suspend_ops omap_pm_ops = {
239 .begin = omap_pm_begin,
240 .end = omap_pm_end,
241 .enter = omap_pm_enter,
242 .finish = omap_pm_finish,
243 .valid = suspend_valid_only_mem,
244};
245
246#endif /* CONFIG_SUSPEND */
247
248static void __init omap3_init_voltages(void)
249{
250 if (!cpu_is_omap34xx())
251 return;
252
253 omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
254 omap2_set_init_voltage("core", "l3_ick", "l3_main");
255}
256
257static void __init omap4_init_voltages(void)
258{
259 if (!cpu_is_omap44xx())
260 return;
261
262 omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
263 omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
264 omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
265}
266
267static inline void omap_init_cpufreq(void)
268{
269 struct platform_device_info devinfo = { };
270
271 if (!of_have_populated_dt())
272 devinfo.name = "omap-cpufreq";
273 else
274 devinfo.name = "cpufreq-cpu0";
275 platform_device_register_full(&devinfo);
276}
277
278static int __init omap2_common_pm_init(void)
279{
280 if (!of_have_populated_dt())
281 omap2_init_processor_devices();
282 omap_pm_if_init();
283
284 return 0;
285}
286omap_postcore_initcall(omap2_common_pm_init);
287
288int __init omap2_common_pm_late_init(void)
289{
290 /*
291 * In the case of DT, the PMIC and SR initialization will be done using
292 * a completely different mechanism.
293 * Disable this part if a DT blob is available.
294 */
295 if (!of_have_populated_dt()) {
296
297 /* Init the voltage layer */
298 omap_pmic_late_init();
299 omap_voltage_late_init();
300
301 /* Initialize the voltages */
302 omap3_init_voltages();
303 omap4_init_voltages();
304
305 /* Smartreflex device init */
306 omap_devinit_smartreflex();
307
308 }
309
310 /* cpufreq dummy device instantiation */
311 omap_init_cpufreq();
312
313#ifdef CONFIG_SUSPEND
314 suspend_set_ops(&omap_pm_ops);
315#endif
316
317 return 0;
318}
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
34#ifdef CONFIG_SUSPEND
35/*
36 * omap_pm_suspend: points to a function that does the SoC-specific
37 * suspend work
38 */
39static 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 */
48struct omap2_oscillator {
49 u32 startup_time;
50 u32 shutdown_time;
51};
52
53static struct omap2_oscillator oscillator = {
54 .startup_time = ULONG_MAX,
55 .shutdown_time = ULONG_MAX,
56};
57
58void omap_pm_setup_oscillator(u32 tstart, u32 tshut)
59{
60 oscillator.startup_time = tstart;
61 oscillator.shutdown_time = tshut;
62}
63
64void 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
74int omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
75{
76 clkdm_allow_idle(clkdm);
77 return 0;
78}
79
80/*
81 * This API is to be called during init to set the various voltage
82 * domains to the voltage as per the opp table. Typically we boot up
83 * at the nominal voltage. So this function finds out the rate of
84 * the clock associated with the voltage domain, finds out the correct
85 * opp entry and sets the voltage domain to the voltage specified
86 * in the opp entry
87 */
88static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
89 const char *oh_name)
90{
91 struct voltagedomain *voltdm;
92 struct clk *clk;
93 struct dev_pm_opp *opp;
94 unsigned long freq, bootup_volt;
95 struct device *dev;
96
97 if (!vdd_name || !clk_name || !oh_name) {
98 pr_err("%s: invalid parameters\n", __func__);
99 goto exit;
100 }
101
102 if (!strncmp(oh_name, "mpu", 3))
103 /*
104 * All current OMAPs share voltage rail and clock
105 * source, so CPU0 is used to represent the MPU-SS.
106 */
107 dev = get_cpu_device(0);
108 else
109 dev = omap_device_get_by_hwmod_name(oh_name);
110
111 if (IS_ERR(dev)) {
112 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
113 __func__, oh_name);
114 goto exit;
115 }
116
117 voltdm = voltdm_lookup(vdd_name);
118 if (!voltdm) {
119 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
120 __func__, vdd_name);
121 goto exit;
122 }
123
124 clk = clk_get(NULL, clk_name);
125 if (IS_ERR(clk)) {
126 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
127 goto exit;
128 }
129
130 freq = clk_get_rate(clk);
131 clk_put(clk);
132
133 opp = dev_pm_opp_find_freq_ceil(dev, &freq);
134 if (IS_ERR(opp)) {
135 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
136 __func__, vdd_name);
137 goto exit;
138 }
139
140 bootup_volt = dev_pm_opp_get_voltage(opp);
141 dev_pm_opp_put(opp);
142
143 if (!bootup_volt) {
144 pr_err("%s: unable to find voltage corresponding to the bootup OPP for vdd_%s\n",
145 __func__, vdd_name);
146 goto exit;
147 }
148
149 voltdm_scale(voltdm, bootup_volt);
150 return 0;
151
152exit:
153 pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
154 return -EINVAL;
155}
156
157#ifdef CONFIG_SUSPEND
158static int omap_pm_enter(suspend_state_t suspend_state)
159{
160 int ret = 0;
161
162 if (!omap_pm_suspend)
163 return -ENOENT; /* XXX doublecheck */
164
165 switch (suspend_state) {
166 case PM_SUSPEND_MEM:
167 ret = omap_pm_suspend();
168 break;
169 default:
170 ret = -EINVAL;
171 }
172
173 return ret;
174}
175
176static int omap_pm_begin(suspend_state_t state)
177{
178 cpu_idle_poll_ctrl(true);
179 if (soc_is_omap34xx())
180 omap_prcm_irq_prepare();
181 return 0;
182}
183
184static void omap_pm_end(void)
185{
186 cpu_idle_poll_ctrl(false);
187}
188
189static void omap_pm_wake(void)
190{
191 if (soc_is_omap34xx())
192 omap_prcm_irq_complete();
193}
194
195static const struct platform_suspend_ops omap_pm_ops = {
196 .begin = omap_pm_begin,
197 .end = omap_pm_end,
198 .enter = omap_pm_enter,
199 .wake = omap_pm_wake,
200 .valid = suspend_valid_only_mem,
201};
202
203/**
204 * omap_common_suspend_init - Set common suspend routines for OMAP SoCs
205 * @pm_suspend: function pointer to SoC specific suspend function
206 */
207void omap_common_suspend_init(void *pm_suspend)
208{
209 omap_pm_suspend = pm_suspend;
210 suspend_set_ops(&omap_pm_ops);
211}
212#endif /* CONFIG_SUSPEND */
213
214static void __init omap3_init_voltages(void)
215{
216 if (!soc_is_omap34xx())
217 return;
218
219 omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
220 omap2_set_init_voltage("core", "l3_ick", "l3_main");
221}
222
223static void __init omap4_init_voltages(void)
224{
225 if (!soc_is_omap44xx())
226 return;
227
228 omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
229 omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
230 omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
231}
232
233static int __init omap2_common_pm_init(void)
234{
235 omap_pm_if_init();
236
237 return 0;
238}
239omap_postcore_initcall(omap2_common_pm_init);
240
241int __init omap2_common_pm_late_init(void)
242{
243 /* Init the voltage layer */
244 omap3_twl_init();
245 omap4_twl_init();
246 omap_voltage_late_init();
247
248 /* Initialize the voltages */
249 omap3_init_voltages();
250 omap4_init_voltages();
251
252 /* Smartreflex device init */
253 omap_devinit_smartreflex();
254
255 return 0;
256}