322 lines
6.9 KiB
C
322 lines
6.9 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/pm_opp.h>
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#include <linux/export.h>
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#include <linux/suspend.h>
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#include <linux/cpu.h>
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#include <asm/system_misc.h>
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#include "omap-pm.h"
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#include "omap_device.h"
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#include "common.h"
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#include "soc.h"
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#include "prcm-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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#include "twl-common.h"
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#ifdef CONFIG_SUSPEND
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/*
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* omap_pm_suspend: points to a function that does the SoC-specific
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* suspend work
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*/
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static int (*omap_pm_suspend)(void);
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#endif
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#ifdef CONFIG_PM
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/**
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* struct omap2_oscillator - Describe the board main oscillator latencies
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* @startup_time: oscillator startup latency
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* @shutdown_time: oscillator shutdown latency
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*/
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struct omap2_oscillator {
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u32 startup_time;
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u32 shutdown_time;
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};
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static struct omap2_oscillator oscillator = {
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.startup_time = ULONG_MAX,
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.shutdown_time = ULONG_MAX,
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};
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void omap_pm_setup_oscillator(u32 tstart, u32 tshut)
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{
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oscillator.startup_time = tstart;
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oscillator.shutdown_time = tshut;
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}
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void omap_pm_get_oscillator(u32 *tstart, u32 *tshut)
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{
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if (!tstart || !tshut)
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return;
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*tstart = oscillator.startup_time;
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*tshut = oscillator.shutdown_time;
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}
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#endif
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static int __init _init_omap_device(char *name)
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{
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struct omap_hwmod *oh;
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struct platform_device *pdev;
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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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pdev = omap_device_build(oh->name, 0, oh, NULL, 0);
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if (WARN(IS_ERR(pdev), "%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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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 __init omap2_init_processor_devices(void)
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{
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_init_omap_device("mpu");
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if (omap3_has_iva())
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_init_omap_device("iva");
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if (cpu_is_omap44xx()) {
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_init_omap_device("l3_main_1");
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_init_omap_device("dsp");
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_init_omap_device("iva");
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} else {
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_init_omap_device("l3_main");
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}
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}
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int __init omap_pm_clkdms_setup(struct clockdomain *clkdm, void *unused)
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{
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/* XXX The usecount test is racy */
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if ((clkdm->flags & CLKDM_CAN_ENABLE_AUTO) &&
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!(clkdm->flags & CLKDM_MISSING_IDLE_REPORTING))
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clkdm_allow_idle(clkdm);
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else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
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clkdm->usecount == 0)
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clkdm_sleep(clkdm);
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return 0;
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}
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/*
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* This API is to be called during init to set 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 sets the voltage domain to the voltage specified
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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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const char *oh_name)
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{
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struct voltagedomain *voltdm;
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struct clk *clk;
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struct dev_pm_opp *opp;
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unsigned long freq, bootup_volt;
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struct device *dev;
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if (!vdd_name || !clk_name || !oh_name) {
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pr_err("%s: invalid parameters\n", __func__);
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goto exit;
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}
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if (!strncmp(oh_name, "mpu", 3))
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/*
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* All current OMAPs share voltage rail and clock
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* source, so CPU0 is used to represent the MPU-SS.
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*/
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dev = get_cpu_device(0);
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else
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dev = omap_device_get_by_hwmod_name(oh_name);
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if (IS_ERR(dev)) {
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pr_err("%s: Unable to get dev pointer for hwmod %s\n",
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__func__, oh_name);
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goto exit;
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}
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voltdm = voltdm_lookup(vdd_name);
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if (!voltdm) {
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pr_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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pr_err("%s: unable to get clk %s\n", __func__, clk_name);
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goto exit;
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}
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freq = clk_get_rate(clk);
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clk_put(clk);
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rcu_read_lock();
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opp = dev_pm_opp_find_freq_ceil(dev, &freq);
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if (IS_ERR(opp)) {
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rcu_read_unlock();
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pr_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 = dev_pm_opp_get_voltage(opp);
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rcu_read_unlock();
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if (!bootup_volt) {
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pr_err("%s: unable to find voltage corresponding to the bootup 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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voltdm_scale(voltdm, bootup_volt);
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return 0;
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exit:
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pr_err("%s: unable to set vdd_%s\n", __func__, vdd_name);
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return -EINVAL;
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}
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#ifdef CONFIG_SUSPEND
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static int omap_pm_enter(suspend_state_t suspend_state)
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{
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int ret = 0;
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if (!omap_pm_suspend)
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return -ENOENT; /* XXX doublecheck */
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switch (suspend_state) {
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case PM_SUSPEND_STANDBY:
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case PM_SUSPEND_MEM:
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ret = omap_pm_suspend();
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break;
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default:
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ret = -EINVAL;
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}
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return ret;
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}
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static int omap_pm_begin(suspend_state_t state)
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{
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cpu_idle_poll_ctrl(true);
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if (cpu_is_omap34xx())
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omap_prcm_irq_prepare();
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return 0;
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}
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static void omap_pm_end(void)
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{
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cpu_idle_poll_ctrl(false);
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}
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static void omap_pm_finish(void)
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{
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if (cpu_is_omap34xx())
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omap_prcm_irq_complete();
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}
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static const struct platform_suspend_ops omap_pm_ops = {
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.begin = omap_pm_begin,
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.end = omap_pm_end,
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.enter = omap_pm_enter,
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.finish = omap_pm_finish,
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.valid = suspend_valid_only_mem,
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};
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/**
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* omap_common_suspend_init - Set common suspend routines for OMAP SoCs
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* @pm_suspend: function pointer to SoC specific suspend function
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*/
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void omap_common_suspend_init(void *pm_suspend)
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{
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omap_pm_suspend = pm_suspend;
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suspend_set_ops(&omap_pm_ops);
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}
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#endif /* CONFIG_SUSPEND */
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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_iva", "dpll1_ck", "mpu");
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omap2_set_init_voltage("core", "l3_ick", "l3_main");
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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");
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omap2_set_init_voltage("core", "l3_div_ck", "l3_main_1");
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omap2_set_init_voltage("iva", "dpll_iva_m5x2_ck", "iva");
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}
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static inline void omap_init_cpufreq(void)
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{
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struct platform_device_info devinfo = { };
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if (!of_have_populated_dt())
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devinfo.name = "omap-cpufreq";
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else
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devinfo.name = "cpufreq-dt";
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platform_device_register_full(&devinfo);
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}
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static int __init omap2_common_pm_init(void)
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{
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if (!of_have_populated_dt())
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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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omap_postcore_initcall(omap2_common_pm_init);
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int __init omap2_common_pm_late_init(void)
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{
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if (of_have_populated_dt()) {
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omap3_twl_init();
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omap4_twl_init();
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}
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/* Init the voltage layer */
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omap_pmic_late_init();
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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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/* cpufreq dummy device instantiation */
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omap_init_cpufreq();
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return 0;
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}
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