<commit_before>/*
 *  CPU frequency scaling for OMAP using OPP information
 *
 *  Copyright (C) 2005 Nokia Corporation
 *  Written by <NAME> <<EMAIL>>
 *
 *  Based on cpu-sa1110.c, Copyright (C) 2001 <NAME>
 *
 * Copyright (C) 2007-2011 Texas Instruments, Inc.
 * - OMAP3/4 support by <NAME>, <NAME>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/cpufreq.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/opp.h>
#include <linux/cpu.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>

#include <asm/smp_plat.h>
#include <asm/cpu.h>

#include <plat/clock.h>
#include <plat/omap-pm.h>
#include <plat/common.h>
#include <plat/omap_device.h>

#include <mach/hardware.h>

/* OPP tolerance in percentage */
#define	OPP_TOLERANCE	4

static struct cpufreq_frequency_table *freq_table;
static atomic_t freq_table_users = ATOMIC_INIT(0);
static struct clk *mpu_clk;
static char *mpu_clk_name;
static struct device *mpu_dev;
static struct regulator *mpu_reg;

static int omap_verify_speed(struct cpufreq_policy *policy)
{
	if (!freq_table)
		return -EINVAL;
	return cpufreq_frequency_table_verify(policy, freq_table);
}

static unsigned int omap_getspeed(unsigned int cpu)
{
	unsigned long rate;

	if (cpu >= NR_CPUS)
		return 0;

	rate = clk_get_rate(mpu_clk) / 1000;
	return rate;
}

static int omap_target(struct cpufreq_policy *policy,
		       unsigned int target_freq,
		       unsigned int relation)
{
	unsigned int i;
	int r, ret = 0;
	struct cpufreq_freqs freqs;
	struct opp *opp;
	unsigned long freq, volt = 0, volt_old = 0, tol = 0;

	if (!freq_table) {
		dev_err(mpu_dev, "%s: cpu%d: no freq table!\n", __func__,
				policy->cpu);
		return -EINVAL;
	}

	ret = cpufreq_frequency_table_target(policy, freq_table, target_freq,
			relation, &i);
	if (ret) {
		dev_dbg(mpu_dev, "%s: cpu%d: no freq match for %d(ret=%d)\n",
			__func__, policy->cpu, target_freq, ret);
		return ret;
	}
	freqs.new = freq_table[i].frequency;
	if (!freqs.new) {
		dev_err(mpu_dev, "%s: cpu%d: no match for freq %d\n", __func__,
			policy->cpu, target_freq);
		return -EINVAL;
	}

	freqs.old = omap_getspeed(policy->cpu);
	freqs.cpu = policy->cpu;

	if (freqs.old == freqs.new && policy->cur == freqs.new)
		return ret;

	/* notifiers */
	for_each_cpu(i, policy->cpus) {
		freqs.cpu = i;
		cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
	}

	freq = freqs.new * 1000;

	if (mpu_reg) {
		opp = opp_find_freq_ceil(mpu_dev, &freq);
		if (IS_ERR(opp)) {
			dev_err(mpu_dev, "%s: unable to find MPU OPP for %d\n",
				__func__, freqs.new);
			return -EINVAL;
		}
		volt = opp_get_voltage(opp);
		tol = volt * OPP_TOLERANCE / 100;
		volt_old = regulator_get_voltage(mpu_reg);
	}

	dev_dbg(mpu_dev, "cpufreq-omap: %u MHz, %ld mV --> %u MHz, %ld mV\n", 
		freqs.old / 1000, volt_old ? volt_old / 1000 : -1,
		freqs.new / 1000, volt ? volt / 1000 : -1);

	/* scaling up?  scale voltage before frequency */
	if (mpu_reg && (freqs.new > freqs.old)) {
		r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);
		if (r < 0) {
			dev_warn(mpu_dev, "%s: unable to scale voltage up.\n",
				 __func__);
			freqs.new = freqs.old;
			goto done;
		}
	}

	ret = clk_set_rate(mpu_clk, freqs.new * 1000);

	/* scaling down?  scale voltage after frequency */<commit_msg>cpufreq: OMAP: ensure valid clock rate before scaling<commit_after>/*
 *  CPU frequency scaling for OMAP using OPP information
 *
 *  Copyright (C) 2005 Nokia Corporation
 *  Written by <NAME> <<EMAIL>>
 *
 *  Based on cpu-sa1110.c, Copyright (C) 2001 <NAME>
 *
 * Copyright (C) 2007-2011 Texas Instruments, Inc.
 * - OMAP3/4 support by <NAME>, <NAME>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/cpufreq.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/opp.h>
#include <linux/cpu.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>

#include <asm/smp_plat.h>
#include <asm/cpu.h>

#include <plat/clock.h>
#include <plat/omap-pm.h>
#include <plat/common.h>
#include <plat/omap_device.h>

#include <mach/hardware.h>

/* OPP tolerance in percentage */
#define	OPP_TOLERANCE	4

static struct cpufreq_frequency_table *freq_table;
static atomic_t freq_table_users = ATOMIC_INIT(0);
static struct clk *mpu_clk;
static char *mpu_clk_name;
static struct device *mpu_dev;
static struct regulator *mpu_reg;

static int omap_verify_speed(struct cpufreq_policy *policy)
{
	if (!freq_table)
		return -EINVAL;
	return cpufreq_frequency_table_verify(policy, freq_table);
}

static unsigned int omap_getspeed(unsigned int cpu)
{
	unsigned long rate;

	if (cpu >= NR_CPUS)
		return 0;

	rate = clk_get_rate(mpu_clk) / 1000;
	return rate;
}

static int omap_target(struct cpufreq_policy *policy,
		       unsigned int target_freq,
		       unsigned int relation)
{
	unsigned int i;
	int r, ret = 0;
	struct cpufreq_freqs freqs;
	struct opp *opp;
	unsigned long freq, volt = 0, volt_old = 0, tol = 0;

	if (!freq_table) {
		dev_err(mpu_dev, "%s: cpu%d: no freq table!\n", __func__,
				policy->cpu);
		return -EINVAL;
	}

	ret = cpufreq_frequency_table_target(policy, freq_table, target_freq,
			relation, &i);
	if (ret) {
		dev_dbg(mpu_dev, "%s: cpu%d: no freq match for %d(ret=%d)\n",
			__func__, policy->cpu, target_freq, ret);
		return ret;
	}
	freqs.new = freq_table[i].frequency;
	if (!freqs.new) {
		dev_err(mpu_dev, "%s: cpu%d: no match for freq %d\n", __func__,
			policy->cpu, target_freq);
		return -EINVAL;
	}

	freqs.old = omap_getspeed(policy->cpu);
	freqs.cpu = policy->cpu;

	if (freqs.old == freqs.new && policy->cur == freqs.new)
		return ret;

	/* notifiers */
	for_each_cpu(i, policy->cpus) {
		freqs.cpu = i;
		cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
	}

	freq = freqs.new * 1000;
	ret = clk_round_rate(mpu_clk, freq);
	if (IS_ERR_VALUE(ret)) {
		dev_warn(mpu_dev,
			 "CPUfreq: Cannot find matching frequency for %lu\n",
			 freq);
		return ret;
	}
	freq = ret;

	if (mpu_reg) {
		opp = opp_find_freq_ceil(mpu_dev, &freq);
		if (IS_ERR(opp)) {
			dev_err(mpu_dev, "%s: unable to find MPU OPP for %d\n",
				__func__, freqs.new);
			return -EINVAL;
		}
		volt = opp_get_voltage(opp);
		tol = volt * OPP_TOLERANCE / 100;
		volt_old = regulator_get_voltage(mpu_reg);
	}

	dev_dbg(mpu_dev, "cpufreq-omap: %u MHz, %ld mV --> %u MHz, %ld mV\n", 
		freqs.old / 1000, volt_old ? volt_old / 1000 : -1,
		freqs.new / 1000, volt ? volt / 1000 : -1);

	/* scaling up?  scale voltage before frequency */
	if (mpu_reg && (freqs.new > freqs.old)) {
		r = regulator_set_voltage(mpu_reg, volt - tol, volt + tol);
		if (r < 0) {
			dev_warn(mpu_dev, "%s: unable to scale voltage up.\n",
				 __func__);
			freqs.new = freqs.old;
			goto done;
		}
	}

	ret = clk_set_rate(mpu_clk, freqs.new * 1000);

	/* scaling down?  scale voltage after frequency */
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