mirror of https://gitee.com/openkylin/linux.git
271 lines
6.0 KiB
C
271 lines
6.0 KiB
C
/*
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* pm.c - Common OMAP2+ power management-related code
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*
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* Copyright (C) 2010 Texas Instruments, Inc.
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* Copyright (C) 2010 Nokia Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/opp.h>
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#include <plat/omap-pm.h>
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#include <plat/omap_device.h>
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#include <plat/common.h>
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#include "voltage.h"
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#include "powerdomain.h"
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#include "clockdomain.h"
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#include "pm.h"
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static struct omap_device_pm_latency *pm_lats;
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static struct device *mpu_dev;
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static struct device *iva_dev;
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static struct device *l3_dev;
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static struct device *dsp_dev;
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struct device *omap2_get_mpuss_device(void)
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{
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WARN_ON_ONCE(!mpu_dev);
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return mpu_dev;
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}
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struct device *omap2_get_iva_device(void)
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{
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WARN_ON_ONCE(!iva_dev);
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return iva_dev;
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}
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struct device *omap2_get_l3_device(void)
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{
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WARN_ON_ONCE(!l3_dev);
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return l3_dev;
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}
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struct device *omap4_get_dsp_device(void)
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{
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WARN_ON_ONCE(!dsp_dev);
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return dsp_dev;
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}
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EXPORT_SYMBOL(omap4_get_dsp_device);
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/* static int _init_omap_device(struct omap_hwmod *oh, void *user) */
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static int _init_omap_device(char *name, struct device **new_dev)
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{
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struct omap_hwmod *oh;
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struct omap_device *od;
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oh = omap_hwmod_lookup(name);
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if (WARN(!oh, "%s: could not find omap_hwmod for %s\n",
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__func__, name))
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return -ENODEV;
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od = omap_device_build(oh->name, 0, oh, NULL, 0, pm_lats, 0, false);
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if (WARN(IS_ERR(od), "%s: could not build omap_device for %s\n",
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__func__, name))
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return -ENODEV;
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*new_dev = &od->pdev.dev;
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return 0;
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}
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/*
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* Build omap_devices for processors and bus.
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*/
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static void omap2_init_processor_devices(void)
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{
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_init_omap_device("mpu", &mpu_dev);
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if (omap3_has_iva())
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_init_omap_device("iva", &iva_dev);
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if (cpu_is_omap44xx()) {
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_init_omap_device("l3_main_1", &l3_dev);
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_init_omap_device("dsp", &dsp_dev);
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_init_omap_device("iva", &iva_dev);
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} else {
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_init_omap_device("l3_main", &l3_dev);
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}
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}
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/* Types of sleep_switch used in omap_set_pwrdm_state */
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#define FORCEWAKEUP_SWITCH 0
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#define LOWPOWERSTATE_SWITCH 1
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/*
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* This sets pwrdm state (other than mpu & core. Currently only ON &
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* RET are supported.
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*/
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int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state)
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{
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u32 cur_state;
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int sleep_switch = 0;
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int ret = 0;
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if (pwrdm == NULL || IS_ERR(pwrdm))
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return -EINVAL;
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while (!(pwrdm->pwrsts & (1 << state))) {
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if (state == PWRDM_POWER_OFF)
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return ret;
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state--;
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}
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cur_state = pwrdm_read_next_pwrst(pwrdm);
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if (cur_state == state)
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return ret;
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if (pwrdm_read_pwrst(pwrdm) < PWRDM_POWER_ON) {
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if ((pwrdm_read_pwrst(pwrdm) > state) &&
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(pwrdm->flags & PWRDM_HAS_LOWPOWERSTATECHANGE)) {
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sleep_switch = LOWPOWERSTATE_SWITCH;
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} else {
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clkdm_wakeup(pwrdm->pwrdm_clkdms[0]);
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pwrdm_wait_transition(pwrdm);
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sleep_switch = FORCEWAKEUP_SWITCH;
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}
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}
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ret = pwrdm_set_next_pwrst(pwrdm, state);
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if (ret) {
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printk(KERN_ERR "Unable to set state of powerdomain: %s\n",
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pwrdm->name);
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goto err;
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}
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switch (sleep_switch) {
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case FORCEWAKEUP_SWITCH:
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if (pwrdm->pwrdm_clkdms[0]->flags & CLKDM_CAN_ENABLE_AUTO)
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clkdm_allow_idle(pwrdm->pwrdm_clkdms[0]);
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else
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clkdm_sleep(pwrdm->pwrdm_clkdms[0]);
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break;
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case LOWPOWERSTATE_SWITCH:
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pwrdm_set_lowpwrstchange(pwrdm);
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break;
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default:
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return ret;
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}
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pwrdm_wait_transition(pwrdm);
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pwrdm_state_switch(pwrdm);
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err:
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return ret;
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}
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/*
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* This API is to be called during init to put the various voltage
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* domains to the voltage as per the opp table. Typically we boot up
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* at the nominal voltage. So this function finds out the rate of
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* the clock associated with the voltage domain, finds out the correct
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* opp entry and puts the voltage domain to the voltage specifies
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* in the opp entry
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*/
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static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
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struct device *dev)
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{
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struct voltagedomain *voltdm;
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struct clk *clk;
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struct opp *opp;
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unsigned long freq, bootup_volt;
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if (!vdd_name || !clk_name || !dev) {
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printk(KERN_ERR "%s: Invalid parameters!\n", __func__);
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goto exit;
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}
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voltdm = omap_voltage_domain_lookup(vdd_name);
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if (IS_ERR(voltdm)) {
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printk(KERN_ERR "%s: Unable to get vdd pointer for vdd_%s\n",
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__func__, vdd_name);
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goto exit;
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}
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clk = clk_get(NULL, clk_name);
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if (IS_ERR(clk)) {
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printk(KERN_ERR "%s: unable to get clk %s\n",
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__func__, clk_name);
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goto exit;
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}
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freq = clk->rate;
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clk_put(clk);
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opp = opp_find_freq_ceil(dev, &freq);
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if (IS_ERR(opp)) {
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printk(KERN_ERR "%s: unable to find boot up OPP for vdd_%s\n",
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__func__, vdd_name);
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goto exit;
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}
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bootup_volt = opp_get_voltage(opp);
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if (!bootup_volt) {
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printk(KERN_ERR "%s: unable to find voltage corresponding"
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"to the bootup OPP for vdd_%s\n", __func__, vdd_name);
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goto exit;
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}
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omap_voltage_scale_vdd(voltdm, bootup_volt);
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return 0;
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exit:
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printk(KERN_ERR "%s: Unable to put vdd_%s to its init voltage\n\n",
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__func__, vdd_name);
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return -EINVAL;
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}
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static void __init omap3_init_voltages(void)
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{
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if (!cpu_is_omap34xx())
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return;
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omap2_set_init_voltage("mpu", "dpll1_ck", mpu_dev);
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omap2_set_init_voltage("core", "l3_ick", l3_dev);
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}
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static void __init omap4_init_voltages(void)
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{
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if (!cpu_is_omap44xx())
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return;
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omap2_set_init_voltage("mpu", "dpll_mpu_ck", mpu_dev);
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omap2_set_init_voltage("core", "l3_div_ck", l3_dev);
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omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", iva_dev);
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}
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static int __init omap2_common_pm_init(void)
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{
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omap2_init_processor_devices();
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omap_pm_if_init();
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return 0;
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}
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postcore_initcall(omap2_common_pm_init);
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static int __init omap2_common_pm_late_init(void)
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{
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/* Init the OMAP TWL parameters */
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omap3_twl_init();
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omap4_twl_init();
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/* Init the voltage layer */
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omap_voltage_late_init();
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/* Initialize the voltages */
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omap3_init_voltages();
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omap4_init_voltages();
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/* Smartreflex device init */
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omap_devinit_smartreflex();
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return 0;
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}
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late_initcall(omap2_common_pm_late_init);
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