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>
18 #include <plat/omap-pm.h>
19 #include <plat/omap_device.h>
20 #include <plat/common.h>
23 #include "powerdomain.h"
24 #include "clockdomain.h"
27 static struct omap_device_pm_latency *pm_lats;
29 static int _init_omap_device(char *name)
31 struct omap_hwmod *oh;
32 struct platform_device *pdev;
34 oh = omap_hwmod_lookup(name);
35 if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
39 pdev = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
40 if (WARN(IS_ERR(pdev), "%s: could not build omap_device for %s\n",
48 * Build omap_devices for processors and bus.
50 static void omap2_init_processor_devices(void)
52 _init_omap_device("mpu");
54 _init_omap_device("iva");
56 if (cpu_is_omap44xx()) {
57 _init_omap_device("l3_main_1");
58 _init_omap_device("dsp");
59 _init_omap_device("iva");
61 _init_omap_device("l3_main");
65 /* Types of sleep_switch used in omap_set_pwrdm_state */
66 #define FORCEWAKEUP_SWITCH 0
67 #define LOWPOWERSTATE_SWITCH 1
70 * This sets pwrdm state (other than mpu & core. Currently only ON &
73 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
76 int sleep_switch = -1;
80 if (pwrdm == NULL || IS_ERR(pwrdm))
83 while (!(pwrdm->pwrsts & (1 << state))) {
84 if (state == PWRDM_POWER_OFF)
89 cur_state = pwrdm_read_next_pwrst(pwrdm);
90 if (cur_state == state)
93 if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
94 if ((pwrdm_read_pwrst(pwrdm) > state) &&
95 (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
96 sleep_switch = LOWPOWERSTATE_SWITCH;
98 hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]);
99 clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
100 sleep_switch = FORCEWAKEUP_SWITCH;
104 ret = pwrdm_set_next_pwrst(pwrdm, state);
106 pr_err("%s: unable to set state of powerdomain: %s\n",
107 __func__, pwrdm->name);
111 switch (sleep_switch) {
112 case FORCEWAKEUP_SWITCH:
114 clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
116 clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
118 case LOWPOWERSTATE_SWITCH:
119 pwrdm_set_lowpwrstchange(pwrdm);
125 pwrdm_state_switch(pwrdm);
131 * This API is to be called during init to set the various voltage
132 * domains to the voltage as per the opp table. Typically we boot up
133 * at the nominal voltage. So this function finds out the rate of
134 * the clock associated with the voltage domain, finds out the correct
135 * opp entry and sets the voltage domain to the voltage specified
138 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
141 struct voltagedomain *voltdm;
144 unsigned long freq, bootup_volt;
147 if (!vdd_name || !clk_name || !oh_name) {
148 pr_err("%s: invalid parameters\n", __func__);
152 dev = omap_device_get_by_hwmod_name(oh_name);
154 pr_err("%s: Unable to get dev pointer for hwmod %s\n",
159 voltdm = voltdm_lookup(vdd_name);
160 if (IS_ERR(voltdm)) {
161 pr_err("%s: unable to get vdd pointer for vdd_%s\n",
166 clk = clk_get(NULL, clk_name);
168 pr_err("%s: unable to get clk %s\n", __func__, clk_name);
175 opp = opp_find_freq_ceil(dev, &freq);
177 pr_err("%s: unable to find boot up OPP for vdd_%s\n",
182 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 OMAP TWL parameters */
232 /* Init the voltage layer */
233 omap_voltage_late_init();
235 /* Initialize the voltages */
236 omap3_init_voltages();
237 omap4_init_voltages();
239 /* Smartreflex device init */
240 omap_devinit_smartreflex();
244 late_initcall(omap2_common_pm_late_init);