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>
20 #include <plat/omap-pm.h>
21 #include <plat/omap_device.h>
24 #include "prcm-common.h"
26 #include "powerdomain.h"
27 #include "clockdomain.h"
29 #include "twl-common.h"
31 static struct omap_device_pm_latency *pm_lats;
34 * omap_pm_suspend: points to a function that does the SoC-specific
37 int (*omap_pm_suspend)(void);
39 static int __init _init_omap_device(char *name)
41 struct omap_hwmod *oh;
42 struct platform_device *pdev;
44 oh = omap_hwmod_lookup(name);
45 if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
49 pdev = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
50 if (WARN(IS_ERR(pdev), "%s: could not build omap_device for %s\n",
58 * Build omap_devices for processors and bus.
60 static void __init omap2_init_processor_devices(void)
62 _init_omap_device("mpu");
64 _init_omap_device("iva");
66 if (cpu_is_omap44xx()) {
67 _init_omap_device("l3_main_1");
68 _init_omap_device("dsp");
69 _init_omap_device("iva");
71 _init_omap_device("l3_main");
75 /* Types of sleep_switch used in omap_set_pwrdm_state */
76 #define FORCEWAKEUP_SWITCH 0
77 #define LOWPOWERSTATE_SWITCH 1
79 int __init omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
81 if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
82 clkdm_allow_idle(clkdm);
83 else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
84 atomic_read(&clkdm->usecount) == 0)
90 * This sets pwrdm state (other than mpu & core. Currently only ON &
93 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 pwrst)
95 u8 curr_pwrst, next_pwrst;
96 int sleep_switch = -1, ret = 0, hwsup = 0;
98 if (!pwrdm || IS_ERR(pwrdm))
101 while (!(pwrdm->pwrsts & (1 << pwrst))) {
102 if (pwrst == PWRDM_POWER_OFF)
107 next_pwrst = pwrdm_read_next_pwrst(pwrdm);
108 if (next_pwrst == pwrst)
111 curr_pwrst = pwrdm_read_pwrst(pwrdm);
112 if (curr_pwrst < PWRDM_POWER_ON) {
113 if ((curr_pwrst > pwrst) &&
114 (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
115 sleep_switch = LOWPOWERSTATE_SWITCH;
117 hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
118 clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
119 sleep_switch = FORCEWAKEUP_SWITCH;
123 ret = pwrdm_set_next_pwrst(pwrdm, pwrst);
125 pr_err("%s: unable to set power state of powerdomain: %s\n",
126 __func__, pwrdm->name);
128 switch (sleep_switch) {
129 case FORCEWAKEUP_SWITCH:
131 clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
133 clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
135 case LOWPOWERSTATE_SWITCH:
136 pwrdm_set_lowpwrstchange(pwrdm);
137 pwrdm_wait_transition(pwrdm);
138 pwrdm_state_switch(pwrdm);
148 * This API is to be called during init to set the various voltage
149 * domains to the voltage as per the opp table. Typically we boot up
150 * at the nominal voltage. So this function finds out the rate of
151 * the clock associated with the voltage domain, finds out the correct
152 * opp entry and sets the voltage domain to the voltage specified
155 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
158 struct voltagedomain *voltdm;
161 unsigned long freq, bootup_volt;
164 if (!vdd_name || !clk_name || !oh_name) {
165 pr_err("%s: invalid parameters\n", __func__);
169 dev = omap_device_get_by_hwmod_name(oh_name);
171 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
176 voltdm = voltdm_lookup(vdd_name);
177 if (IS_ERR(voltdm)) {
178 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
183 clk = clk_get(NULL, clk_name);
185 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
193 opp = opp_find_freq_ceil(dev, &freq);
196 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
201 bootup_volt = opp_get_voltage(opp);
204 pr_err("%s: unable to find voltage corresponding "
205 "to the bootup OPP for vdd_%s\n", __func__, vdd_name);
209 voltdm_scale(voltdm, bootup_volt);
213 pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
217 #ifdef CONFIG_SUSPEND
218 static int omap_pm_enter(suspend_state_t suspend_state)
222 if (!omap_pm_suspend)
223 return -ENOENT; /* XXX doublecheck */
225 switch (suspend_state) {
226 case PM_SUSPEND_STANDBY:
228 ret = omap_pm_suspend();
237 static int omap_pm_begin(suspend_state_t state)
240 if (cpu_is_omap34xx())
241 omap_prcm_irq_prepare();
245 static void omap_pm_end(void)
251 static void omap_pm_finish(void)
253 if (cpu_is_omap34xx())
254 omap_prcm_irq_complete();
257 static const struct platform_suspend_ops omap_pm_ops = {
258 .begin = omap_pm_begin,
260 .enter = omap_pm_enter,
261 .finish = omap_pm_finish,
262 .valid = suspend_valid_only_mem,
265 #endif /* CONFIG_SUSPEND */
267 static void __init omap3_init_voltages(void)
269 if (!cpu_is_omap34xx())
272 omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
273 omap2_set_init_voltage("core", "l3_ick", "l3_main");
276 static void __init omap4_init_voltages(void)
278 if (!cpu_is_omap44xx())
281 omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
282 omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
283 omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
286 static int __init omap2_common_pm_init(void)
288 if (!of_have_populated_dt())
289 omap2_init_processor_devices();
294 postcore_initcall(omap2_common_pm_init);
296 static int __init omap2_common_pm_late_init(void)
299 * In the case of DT, the PMIC and SR initialization will be done using
300 * a completely different mechanism.
301 * Disable this part if a DT blob is available.
303 if (of_have_populated_dt())
306 /* Init the voltage layer */
307 omap_pmic_late_init();
308 omap_voltage_late_init();
310 /* Initialize the voltages */
311 omap3_init_voltages();
312 omap4_init_voltages();
314 /* Smartreflex device init */
315 omap_devinit_smartreflex();
317 #ifdef CONFIG_SUSPEND
318 suspend_set_ops(&omap_pm_ops);
323 late_initcall(omap2_common_pm_late_init);