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 struct device *mpu_dev;
30 static struct device *iva_dev;
31 static struct device *l3_dev;
32 static struct device *dsp_dev;
34 struct device *omap2_get_mpuss_device(void)
36 WARN_ON_ONCE(!mpu_dev);
40 struct device *omap2_get_iva_device(void)
42 WARN_ON_ONCE(!iva_dev);
46 struct device *omap2_get_l3_device(void)
48 WARN_ON_ONCE(!l3_dev);
52 struct device *omap4_get_dsp_device(void)
54 WARN_ON_ONCE(!dsp_dev);
57 EXPORT_SYMBOL(omap4_get_dsp_device);
59 /* static int _init_omap_device(struct omap_hwmod *oh, void *user) */
60 static int _init_omap_device(char *name, struct device **new_dev)
62 struct omap_hwmod *oh;
63 struct omap_device *od;
65 oh = omap_hwmod_lookup(name);
66 if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
70 od = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
71 if (WARN(IS_ERR(od), "%s: could not build omap_device for %s\n",
75 *new_dev = &od->pdev.dev;
81 * Build omap_devices for processors and bus.
83 static void omap2_init_processor_devices(void)
85 _init_omap_device("mpu", &mpu_dev);
87 _init_omap_device("iva", &iva_dev);
89 if (cpu_is_omap44xx()) {
90 _init_omap_device("l3_main_1", &l3_dev);
91 _init_omap_device("dsp", &dsp_dev);
92 _init_omap_device("iva", &iva_dev);
94 _init_omap_device("l3_main", &l3_dev);
98 /* Types of sleep_switch used in omap_set_pwrdm_state */
99 #define FORCEWAKEUP_SWITCH 0
100 #define LOWPOWERSTATE_SWITCH 1
103 * This sets pwrdm state (other than mpu & core. Currently only ON &
106 int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
109 int sleep_switch = -1;
112 if (pwrdm == NULL || IS_ERR(pwrdm))
115 while (!(pwrdm->pwrsts & (1 << state))) {
116 if (state == PWRDM_POWER_OFF)
121 cur_state = pwrdm_read_next_pwrst(pwrdm);
122 if (cur_state == state)
125 if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
126 if ((pwrdm_read_pwrst(pwrdm) > state) &&
127 (pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
128 sleep_switch = LOWPOWERSTATE_SWITCH;
130 clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
131 pwrdm_wait_transition(pwrdm);
132 sleep_switch = FORCEWAKEUP_SWITCH;
136 ret = pwrdm_set_next_pwrst(pwrdm, state);
138 printk(KERN_ERR "Unable to set state of powerdomain: %s\n",
143 switch (sleep_switch) {
144 case FORCEWAKEUP_SWITCH:
145 if (pwrdm->pwrdm_clkdms[0]->flags & CLKDM_CAN_ENABLE_AUTO)
146 clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
148 clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
150 case LOWPOWERSTATE_SWITCH:
151 pwrdm_set_lowpwrstchange(pwrdm);
157 pwrdm_wait_transition(pwrdm);
158 pwrdm_state_switch(pwrdm);
164 * This API is to be called during init to put the various voltage
165 * domains to the voltage as per the opp table. Typically we boot up
166 * at the nominal voltage. So this function finds out the rate of
167 * the clock associated with the voltage domain, finds out the correct
168 * opp entry and puts the voltage domain to the voltage specifies
171 static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
174 struct voltagedomain *voltdm;
177 unsigned long freq, bootup_volt;
179 if (!vdd_name || !clk_name || !dev) {
180 printk(KERN_ERR "%s: Invalid parameters!\n", __func__);
184 voltdm = omap_voltage_domain_lookup(vdd_name);
185 if (IS_ERR(voltdm)) {
186 printk(KERN_ERR "%s: Unable to get vdd pointer for vdd_%s\n",
191 clk = clk_get(NULL, clk_name);
193 printk(KERN_ERR "%s: unable to get clk %s\n",
201 opp = opp_find_freq_ceil(dev, &freq);
203 printk(KERN_ERR "%s: unable to find boot up OPP for vdd_%s\n",
208 bootup_volt = opp_get_voltage(opp);
210 printk(KERN_ERR "%s: unable to find voltage corresponding"
211 "to the bootup OPP for vdd_%s\n", __func__, vdd_name);
215 omap_voltage_scale_vdd(voltdm, bootup_volt);
219 printk(KERN_ERR "%s: Unable to put vdd_%s to its init voltage\n\n",
224 static void __init omap3_init_voltages(void)
226 if (!cpu_is_omap34xx())
229 omap2_set_init_voltage("mpu", "dpll1_ck", mpu_dev);
230 omap2_set_init_voltage("core", "l3_ick", l3_dev);
233 static void __init omap4_init_voltages(void)
235 if (!cpu_is_omap44xx())
238 omap2_set_init_voltage("mpu", "dpll_mpu_ck", mpu_dev);
239 omap2_set_init_voltage("core", "l3_div_ck", l3_dev);
240 omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", iva_dev);
243 static int __init omap2_common_pm_init(void)
245 omap2_init_processor_devices();
250 postcore_initcall(omap2_common_pm_init);
252 static int __init omap2_common_pm_late_init(void)
254 /* Init the OMAP TWL parameters */
258 /* Init the voltage layer */
259 omap_voltage_late_init();
261 /* Initialize the voltages */
262 omap3_init_voltages();
263 omap4_init_voltages();
265 /* Smartreflex device init */
266 omap_devinit_smartreflex();
270 late_initcall(omap2_common_pm_late_init);