2 * pm.c - Common OMAP2+ power management-related code
4 * Copyright (C) 2010 Texas Instruments, Inc.
5 * Copyright (C) 2010 Nokia Corporation
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.
12 #include <linux/kernel.h>
13 #include <linux/init.h>
15 #include <linux/err.h>
16 #include <linux/opp.h>
17 #include <linux/export.h>
18 #include <linux/suspend.h>
19 #include <linux/cpu.h>
21 #include <asm/system_misc.h>
24 #include "omap_device.h"
28 #include "prcm-common.h"
30 #include "powerdomain.h"
31 #include "clockdomain.h"
33 #include "twl-common.h"
35 static struct omap_device_pm_latency *pm_lats;
38 * omap_pm_suspend: points to a function that does the SoC-specific
41 int (*omap_pm_suspend)(void);
43 static int __init _init_omap_device(char *name)
45 struct omap_hwmod *oh;
46 struct platform_device *pdev;
48 oh = omap_hwmod_lookup(name);
49 if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
53 pdev = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
54 if (WARN(IS_ERR(pdev), "%s: could not build omap_device for %s\n",
62 * Build omap_devices for processors and bus.
64 static void __init omap2_init_processor_devices(void)
66 _init_omap_device("mpu");
68 _init_omap_device("iva");
70 if (cpu_is_omap44xx()) {
71 _init_omap_device("l3_main_1");
72 _init_omap_device("dsp");
73 _init_omap_device("iva");
75 _init_omap_device("l3_main");
79 /* Types of sleep_switch used in omap_set_pwrdm_state */
80 #define FORCEWAKEUP_SWITCH 0
81 #define LOWPOWERSTATE_SWITCH 1
83 int __init omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
85 if ((clkdm->flags & CLKDM_CAN_ENABLE_AUTO) &&
86 !(clkdm->flags & CLKDM_MISSING_IDLE_REPORTING))
87 clkdm_allow_idle(clkdm);
88 else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
89 atomic_read(&clkdm->usecount) == 0)
95 * This sets pwrdm state (other than mpu & core. Currently only ON &
98 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 pwrst)
100 u8 curr_pwrst, next_pwrst;
101 int sleep_switch = -1, ret = 0, hwsup = 0;
103 if (!pwrdm || IS_ERR(pwrdm))
106 while (!(pwrdm->pwrsts & (1 << pwrst))) {
107 if (pwrst == PWRDM_POWER_OFF)
112 next_pwrst = pwrdm_read_next_pwrst(pwrdm);
113 if (next_pwrst == pwrst)
116 curr_pwrst = pwrdm_read_pwrst(pwrdm);
117 if (curr_pwrst < PWRDM_POWER_ON) {
118 if ((curr_pwrst > pwrst) &&
119 (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
120 sleep_switch = LOWPOWERSTATE_SWITCH;
122 hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
123 clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
124 sleep_switch = FORCEWAKEUP_SWITCH;
128 ret = pwrdm_set_next_pwrst(pwrdm, pwrst);
130 pr_err("%s: unable to set power state of powerdomain: %s\n",
131 __func__, pwrdm->name);
133 switch (sleep_switch) {
134 case FORCEWAKEUP_SWITCH:
136 clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
138 clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
140 case LOWPOWERSTATE_SWITCH:
141 pwrdm_set_lowpwrstchange(pwrdm);
142 pwrdm_wait_transition(pwrdm);
143 pwrdm_state_switch(pwrdm);
153 * This API is to be called during init to set the various voltage
154 * domains to the voltage as per the opp table. Typically we boot up
155 * at the nominal voltage. So this function finds out the rate of
156 * the clock associated with the voltage domain, finds out the correct
157 * opp entry and sets the voltage domain to the voltage specified
160 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
163 struct voltagedomain *voltdm;
166 unsigned long freq, bootup_volt;
169 if (!vdd_name || !clk_name || !oh_name) {
170 pr_err("%s: invalid parameters\n", __func__);
174 if (!strncmp(oh_name, "mpu", 3))
176 * All current OMAPs share voltage rail and clock
177 * source, so CPU0 is used to represent the MPU-SS.
179 dev = get_cpu_device(0);
181 dev = omap_device_get_by_hwmod_name(oh_name);
184 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
189 voltdm = voltdm_lookup(vdd_name);
191 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
196 clk = clk_get(NULL, clk_name);
198 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
202 freq = clk_get_rate(clk);
206 opp = opp_find_freq_ceil(dev, &freq);
209 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
214 bootup_volt = opp_get_voltage(opp);
217 pr_err("%s: unable to find voltage corresponding to the bootup OPP for vdd_%s\n",
222 voltdm_scale(voltdm, bootup_volt);
226 pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
230 #ifdef CONFIG_SUSPEND
231 static int omap_pm_enter(suspend_state_t suspend_state)
235 if (!omap_pm_suspend)
236 return -ENOENT; /* XXX doublecheck */
238 switch (suspend_state) {
239 case PM_SUSPEND_STANDBY:
241 ret = omap_pm_suspend();
250 static int omap_pm_begin(suspend_state_t state)
253 if (cpu_is_omap34xx())
254 omap_prcm_irq_prepare();
258 static void omap_pm_end(void)
264 static void omap_pm_finish(void)
266 if (cpu_is_omap34xx())
267 omap_prcm_irq_complete();
270 static const struct platform_suspend_ops omap_pm_ops = {
271 .begin = omap_pm_begin,
273 .enter = omap_pm_enter,
274 .finish = omap_pm_finish,
275 .valid = suspend_valid_only_mem,
278 #endif /* CONFIG_SUSPEND */
280 static void __init omap3_init_voltages(void)
282 if (!cpu_is_omap34xx())
285 omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
286 omap2_set_init_voltage("core", "l3_ick", "l3_main");
289 static void __init omap4_init_voltages(void)
291 if (!cpu_is_omap44xx())
294 omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
295 omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
296 omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
299 static int __init omap2_common_pm_init(void)
301 if (!of_have_populated_dt())
302 omap2_init_processor_devices();
307 postcore_initcall(omap2_common_pm_init);
309 int __init omap2_common_pm_late_init(void)
312 * In the case of DT, the PMIC and SR initialization will be done using
313 * a completely different mechanism.
314 * Disable this part if a DT blob is available.
316 if (of_have_populated_dt())
319 /* Init the voltage layer */
320 omap_pmic_late_init();
321 omap_voltage_late_init();
323 /* Initialize the voltages */
324 omap3_init_voltages();
325 omap4_init_voltages();
327 /* Smartreflex device init */
328 omap_devinit_smartreflex();
330 #ifdef CONFIG_SUSPEND
331 suspend_set_ops(&omap_pm_ops);