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>
19 #include <plat/omap-pm.h>
20 #include <plat/omap_device.h>
21 #include <plat/common.h>
24 #include "powerdomain.h"
25 #include "clockdomain.h"
27 #include "twl-common.h"
29 static struct omap_device_pm_latency *pm_lats;
31 static int _init_omap_device(char *name)
33 struct omap_hwmod *oh;
34 struct platform_device *pdev;
36 oh = omap_hwmod_lookup(name);
37 if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
41 pdev = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
42 if (WARN(IS_ERR(pdev), "%s: could not build omap_device for %s\n",
50 * Build omap_devices for processors and bus.
52 static void omap2_init_processor_devices(void)
54 _init_omap_device("mpu");
56 _init_omap_device("iva");
58 if (cpu_is_omap44xx()) {
59 _init_omap_device("l3_main_1");
60 _init_omap_device("dsp");
61 _init_omap_device("iva");
63 _init_omap_device("l3_main");
67 /* Types of sleep_switch used in omap_set_pwrdm_state */
68 #define FORCEWAKEUP_SWITCH 0
69 #define LOWPOWERSTATE_SWITCH 1
72 * This sets pwrdm state (other than mpu & core. Currently only ON &
75 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 pwrst)
77 u8 curr_pwrst, next_pwrst;
78 int sleep_switch = -1, ret = 0, hwsup = 0;
80 if (!pwrdm || IS_ERR(pwrdm))
83 while (!(pwrdm->pwrsts & (1 << pwrst))) {
84 if (pwrst == PWRDM_POWER_OFF)
89 next_pwrst = pwrdm_read_next_pwrst(pwrdm);
90 if (next_pwrst == pwrst)
93 curr_pwrst = pwrdm_read_pwrst(pwrdm);
94 if (curr_pwrst < PWRDM_POWER_ON) {
95 if ((curr_pwrst > pwrst) &&
96 (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
97 sleep_switch = LOWPOWERSTATE_SWITCH;
99 hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
100 clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
101 sleep_switch = FORCEWAKEUP_SWITCH;
105 ret = pwrdm_set_next_pwrst(pwrdm, pwrst);
107 pr_err("%s: unable to set power state of powerdomain: %s\n",
108 __func__, pwrdm->name);
110 switch (sleep_switch) {
111 case FORCEWAKEUP_SWITCH:
113 clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
115 clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
117 case LOWPOWERSTATE_SWITCH:
118 pwrdm_set_lowpwrstchange(pwrdm);
119 pwrdm_wait_transition(pwrdm);
120 pwrdm_state_switch(pwrdm);
128 * This API is to be called during init to set the various voltage
129 * domains to the voltage as per the opp table. Typically we boot up
130 * at the nominal voltage. So this function finds out the rate of
131 * the clock associated with the voltage domain, finds out the correct
132 * opp entry and sets the voltage domain to the voltage specified
135 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
138 struct voltagedomain *voltdm;
141 unsigned long freq, bootup_volt;
144 if (!vdd_name || !clk_name || !oh_name) {
145 pr_err("%s: invalid parameters\n", __func__);
149 dev = omap_device_get_by_hwmod_name(oh_name);
151 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
156 voltdm = voltdm_lookup(vdd_name);
157 if (IS_ERR(voltdm)) {
158 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
163 clk = clk_get(NULL, clk_name);
165 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
173 opp = opp_find_freq_ceil(dev, &freq);
176 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
181 bootup_volt = opp_get_voltage(opp);
184 pr_err("%s: unable to find voltage corresponding "
185 "to the bootup OPP for vdd_%s\n", __func__, vdd_name);
189 voltdm_scale(voltdm, bootup_volt);
193 pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
197 static void __init omap3_init_voltages(void)
199 if (!cpu_is_omap34xx())
202 omap2_set_init_voltage("mpu_iva", "dpll1_ck", "mpu");
203 omap2_set_init_voltage("core", "l3_ick", "l3_main");
206 static void __init omap4_init_voltages(void)
208 if (!cpu_is_omap44xx())
211 omap2_set_init_voltage("mpu", "dpll_mpu_ck", "mpu");
212 omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
213 omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
216 static int __init omap2_common_pm_init(void)
218 if (!of_have_populated_dt())
219 omap2_init_processor_devices();
224 postcore_initcall(omap2_common_pm_init);
226 static int __init omap2_common_pm_late_init(void)
228 /* Init the voltage layer */
229 omap_pmic_late_init();
230 omap_voltage_late_init();
232 /* Initialize the voltages */
233 omap3_init_voltages();
234 omap4_init_voltages();
236 /* Smartreflex device init */
237 omap_devinit_smartreflex();
241 late_initcall(omap2_common_pm_late_init);