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 <asm/system_misc.h>
22 #include <plat/omap-pm.h>
23 #include <plat/omap_device.h>
26 #include "prcm-common.h"
28 #include "powerdomain.h"
29 #include "clockdomain.h"
31 #include "twl-common.h"
33 static struct omap_device_pm_latency *pm_lats;
36 * omap_pm_suspend: points to a function that does the SoC-specific
39 int (*omap_pm_suspend)(void);
41 static int __init _init_omap_device(char *name)
43 struct omap_hwmod *oh;
44 struct platform_device *pdev;
46 oh = omap_hwmod_lookup(name);
47 if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
51 pdev = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
52 if (WARN(IS_ERR(pdev), "%s: could not build omap_device for %s\n",
60 * Build omap_devices for processors and bus.
62 static void __init omap2_init_processor_devices(void)
64 _init_omap_device("mpu");
66 _init_omap_device("iva");
68 if (cpu_is_omap44xx()) {
69 _init_omap_device("l3_main_1");
70 _init_omap_device("dsp");
71 _init_omap_device("iva");
73 _init_omap_device("l3_main");
77 /* Types of sleep_switch used in omap_set_pwrdm_state */
78 #define FORCEWAKEUP_SWITCH 0
79 #define LOWPOWERSTATE_SWITCH 1
81 int __init omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
83 if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
84 clkdm_allow_idle(clkdm);
85 else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
86 atomic_read(&clkdm->usecount) == 0)
92 * This sets pwrdm state (other than mpu & core. Currently only ON &
95 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 pwrst)
97 u8 curr_pwrst, next_pwrst;
98 int sleep_switch = -1, ret = 0, hwsup = 0;
100 if (!pwrdm || IS_ERR(pwrdm))
103 while (!(pwrdm->pwrsts & (1 << pwrst))) {
104 if (pwrst == PWRDM_POWER_OFF)
109 next_pwrst = pwrdm_read_next_pwrst(pwrdm);
110 if (next_pwrst == pwrst)
113 curr_pwrst = pwrdm_read_pwrst(pwrdm);
114 if (curr_pwrst < PWRDM_POWER_ON) {
115 if ((curr_pwrst > pwrst) &&
116 (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
117 sleep_switch = LOWPOWERSTATE_SWITCH;
119 hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
120 clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
121 sleep_switch = FORCEWAKEUP_SWITCH;
125 ret = pwrdm_set_next_pwrst(pwrdm, pwrst);
127 pr_err("%s: unable to set power state of powerdomain: %s\n",
128 __func__, pwrdm->name);
130 switch (sleep_switch) {
131 case FORCEWAKEUP_SWITCH:
133 clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
135 clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
137 case LOWPOWERSTATE_SWITCH:
138 pwrdm_set_lowpwrstchange(pwrdm);
139 pwrdm_wait_transition(pwrdm);
140 pwrdm_state_switch(pwrdm);
150 * This API is to be called during init to set the various voltage
151 * domains to the voltage as per the opp table. Typically we boot up
152 * at the nominal voltage. So this function finds out the rate of
153 * the clock associated with the voltage domain, finds out the correct
154 * opp entry and sets the voltage domain to the voltage specified
157 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
160 struct voltagedomain *voltdm;
163 unsigned long freq, bootup_volt;
166 if (!vdd_name || !clk_name || !oh_name) {
167 pr_err("%s: invalid parameters\n", __func__);
171 dev = omap_device_get_by_hwmod_name(oh_name);
173 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
178 voltdm = voltdm_lookup(vdd_name);
179 if (IS_ERR(voltdm)) {
180 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
185 clk = clk_get(NULL, clk_name);
187 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
195 opp = opp_find_freq_ceil(dev, &freq);
198 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
203 bootup_volt = opp_get_voltage(opp);
206 pr_err("%s: unable to find voltage corresponding to the bootup OPP for vdd_%s\n",
211 voltdm_scale(voltdm, bootup_volt);
215 pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
219 #ifdef CONFIG_SUSPEND
220 static int omap_pm_enter(suspend_state_t suspend_state)
224 if (!omap_pm_suspend)
225 return -ENOENT; /* XXX doublecheck */
227 switch (suspend_state) {
228 case PM_SUSPEND_STANDBY:
230 ret = omap_pm_suspend();
239 static int omap_pm_begin(suspend_state_t state)
242 if (cpu_is_omap34xx())
243 omap_prcm_irq_prepare();
247 static void omap_pm_end(void)
253 static void omap_pm_finish(void)
255 if (cpu_is_omap34xx())
256 omap_prcm_irq_complete();
259 static const struct platform_suspend_ops omap_pm_ops = {
260 .begin = omap_pm_begin,
262 .enter = omap_pm_enter,
263 .finish = omap_pm_finish,
264 .valid = suspend_valid_only_mem,
267 #endif /* CONFIG_SUSPEND */
269 static void __init omap3_init_voltages(void)
271 if (!cpu_is_omap34xx())
274 omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
275 omap2_set_init_voltage("core", "l3_ick", "l3_main");
278 static void __init omap4_init_voltages(void)
280 if (!cpu_is_omap44xx())
283 omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
284 omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
285 omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
288 static int __init omap2_common_pm_init(void)
290 if (!of_have_populated_dt())
291 omap2_init_processor_devices();
296 postcore_initcall(omap2_common_pm_init);
298 int __init omap2_common_pm_late_init(void)
301 * In the case of DT, the PMIC and SR initialization will be done using
302 * a completely different mechanism.
303 * Disable this part if a DT blob is available.
305 if (of_have_populated_dt())
308 /* Init the voltage layer */
309 omap_pmic_late_init();
310 omap_voltage_late_init();
312 /* Initialize the voltages */
313 omap3_init_voltages();
314 omap4_init_voltages();
316 /* Smartreflex device init */
317 omap_devinit_smartreflex();
319 #ifdef CONFIG_SUSPEND
320 suspend_set_ops(&omap_pm_ops);