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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/opp.h>
17
18#include <plat/omap-pm.h>
19#include <plat/omap_device.h>
20#include <plat/common.h>
21
22#include "voltage.h"
23#include "powerdomain.h"
24#include "clockdomain.h"
25#include "pm.h"
26
27static struct omap_device_pm_latency *pm_lats;
28
29static struct device *mpu_dev;
30static struct device *iva_dev;
31static struct device *l3_dev;
32static struct device *dsp_dev;
33
34struct device *omap2_get_mpuss_device(void)
35{
36 WARN_ON_ONCE(!mpu_dev);
37 return mpu_dev;
38}
39
40struct device *omap2_get_iva_device(void)
41{
42 WARN_ON_ONCE(!iva_dev);
43 return iva_dev;
44}
45
46struct device *omap2_get_l3_device(void)
47{
48 WARN_ON_ONCE(!l3_dev);
49 return l3_dev;
50}
51
52struct device *omap4_get_dsp_device(void)
53{
54 WARN_ON_ONCE(!dsp_dev);
55 return dsp_dev;
56}
57EXPORT_SYMBOL(omap4_get_dsp_device);
58
59/* static int _init_omap_device(struct omap_hwmod *oh, void *user) */
60static int _init_omap_device(char *name, struct device **new_dev)
61{
62 struct omap_hwmod *oh;
63 struct omap_device *od;
64
65 oh = omap_hwmod_lookup(name);
66 if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
67 __func__, name))
68 return -ENODEV;
69
70 od = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
71 if (WARN(IS_ERR(od), "%s: could not build omap_device for %s\n",
72 __func__, name))
73 return -ENODEV;
74
75 *new_dev = &od->pdev.dev;
76
77 return 0;
78}
79
80/*
81 * Build omap_devices for processors and bus.
82 */
83static void omap2_init_processor_devices(void)
84{
85 _init_omap_device("mpu", &mpu_dev);
86 if (omap3_has_iva())
87 _init_omap_device("iva", &iva_dev);
88
89 if (cpu_is_omap44xx()) {
90 _init_omap_device("l3_main_1", &l3_dev);
91 _init_omap_device("dsp", &dsp_dev);
92 _init_omap_device("iva", &iva_dev);
93 } else {
94 _init_omap_device("l3_main", &l3_dev);
95 }
96}
97
98/* Types of sleep_switch used in omap_set_pwrdm_state */
99#define FORCEWAKEUP_SWITCH 0
100#define LOWPOWERSTATE_SWITCH 1
101
102/*
103 * This sets pwrdm state (other than mpu & core. Currently only ON &
104 * RET are supported.
105 */
106int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
107{
108 u32 cur_state;
109 int sleep_switch = -1;
110 int ret = 0;
111 int hwsup = 0;
112
113 if (pwrdm == NULL || IS_ERR(pwrdm))
114 return -EINVAL;
115
116 while (!(pwrdm->pwrsts & (1 << state))) {
117 if (state == PWRDM_POWER_OFF)
118 return ret;
119 state--;
120 }
121
122 cur_state = pwrdm_read_next_pwrst(pwrdm);
123 if (cur_state == state)
124 return ret;
125
126 if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
127 if ((pwrdm_read_pwrst(pwrdm) > state) &&
128 (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
129 sleep_switch = LOWPOWERSTATE_SWITCH;
130 } else {
131 hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
132 clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
133 sleep_switch = FORCEWAKEUP_SWITCH;
134 }
135 }
136
137 ret = pwrdm_set_next_pwrst(pwrdm, state);
138 if (ret) {
139 printk(KERN_ERR "Unable to set state of powerdomain: %s\n",
140 pwrdm->name);
141 goto err;
142 }
143
144 switch (sleep_switch) {
145 case FORCEWAKEUP_SWITCH:
146 if (hwsup)
147 clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
148 else
149 clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
150 break;
151 case LOWPOWERSTATE_SWITCH:
152 pwrdm_set_lowpwrstchange(pwrdm);
153 break;
154 default:
155 return ret;
156 }
157
158 pwrdm_state_switch(pwrdm);
159err:
160 return ret;
161}
162
163/*
164 * This API is to be called during init to put the various voltage
165 * domains to the voltage as per the opp table. Typically we boot up
166 * at the nominal voltage. So this function finds out the rate of
167 * the clock associated with the voltage domain, finds out the correct
168 * opp entry and puts the voltage domain to the voltage specifies
169 * in the opp entry
170 */
171static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
172 struct device *dev)
173{
174 struct voltagedomain *voltdm;
175 struct clk *clk;
176 struct opp *opp;
177 unsigned long freq, bootup_volt;
178
179 if (!vdd_name || !clk_name || !dev) {
180 printk(KERN_ERR "%s: Invalid parameters!\n", __func__);
181 goto exit;
182 }
183
184 voltdm = omap_voltage_domain_lookup(vdd_name);
185 if (IS_ERR(voltdm)) {
186 printk(KERN_ERR "%s: Unable to get vdd pointer for vdd_%s\n",
187 __func__, vdd_name);
188 goto exit;
189 }
190
191 clk = clk_get(NULL, clk_name);
192 if (IS_ERR(clk)) {
193 printk(KERN_ERR "%s: unable to get clk %s\n",
194 __func__, clk_name);
195 goto exit;
196 }
197
198 freq = clk->rate;
199 clk_put(clk);
200
201 opp = opp_find_freq_ceil(dev, &freq);
202 if (IS_ERR(opp)) {
203 printk(KERN_ERR "%s: unable to find boot up OPP for vdd_%s\n",
204 __func__, vdd_name);
205 goto exit;
206 }
207
208 bootup_volt = opp_get_voltage(opp);
209 if (!bootup_volt) {
210 printk(KERN_ERR "%s: unable to find voltage corresponding"
211 "to the bootup OPP for vdd_%s\n", __func__, vdd_name);
212 goto exit;
213 }
214
215 omap_voltage_scale_vdd(voltdm, bootup_volt);
216 return 0;
217
218exit:
219 printk(KERN_ERR "%s: Unable to put vdd_%s to its init voltage\n\n",
220 __func__, vdd_name);
221 return -EINVAL;
222}
223
224static void __init omap3_init_voltages(void)
225{
226 if (!cpu_is_omap34xx())
227 return;
228
229 omap2_set_init_voltage("mpu", "dpll1_ck", mpu_dev);
230 omap2_set_init_voltage("core", "l3_ick", l3_dev);
231}
232
233static void __init omap4_init_voltages(void)
234{
235 if (!cpu_is_omap44xx())
236 return;
237
238 omap2_set_init_voltage("mpu", "dpll_mpu_ck", mpu_dev);
239 omap2_set_init_voltage("core", "l3_div_ck", l3_dev);
240 omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", iva_dev);
241}
242
243static int __init omap2_common_pm_init(void)
244{
245 omap2_init_processor_devices();
246 omap_pm_if_init();
247
248 return 0;
249}
250postcore_initcall(omap2_common_pm_init);
251
252static int __init omap2_common_pm_late_init(void)
253{
254 /* Init the OMAP TWL parameters */
255 omap3_twl_init();
256 omap4_twl_init();
257
258 /* Init the voltage layer */
259 omap_voltage_late_init();
260
261 /* Initialize the voltages */
262 omap3_init_voltages();
263 omap4_init_voltages();
264
265 /* Smartreflex device init */
266 omap_devinit_smartreflex();
267
268 return 0;
269}
270late_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}