+++ /dev/null
-/*
- * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
- * http://www.samsung.com
- *
- * EXYNOS - CPU frequency scaling support for EXYNOS series
- *
- * 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/kernel.h>
-#include <linux/err.h>
-#include <linux/clk.h>
-#include <linux/io.h>
-#include <linux/slab.h>
-#include <linux/regulator/consumer.h>
-#include <linux/cpufreq.h>
-#include <linux/platform_device.h>
-#include <linux/of.h>
-#include <linux/cpu_cooling.h>
-#include <linux/cpu.h>
-
-#include "exynos-cpufreq.h"
-
-static struct exynos_dvfs_info *exynos_info;
-static struct thermal_cooling_device *cdev;
-static struct regulator *arm_regulator;
-static unsigned int locking_frequency;
-
-static int exynos_cpufreq_get_index(unsigned int freq)
-{
- struct cpufreq_frequency_table *freq_table = exynos_info->freq_table;
- struct cpufreq_frequency_table *pos;
-
- cpufreq_for_each_entry(pos, freq_table)
- if (pos->frequency == freq)
- break;
-
- if (pos->frequency == CPUFREQ_TABLE_END)
- return -EINVAL;
-
- return pos - freq_table;
-}
-
-static int exynos_cpufreq_scale(unsigned int target_freq)
-{
- struct cpufreq_frequency_table *freq_table = exynos_info->freq_table;
- unsigned int *volt_table = exynos_info->volt_table;
- struct cpufreq_policy *policy = cpufreq_cpu_get(0);
- unsigned int arm_volt, safe_arm_volt = 0;
- unsigned int mpll_freq_khz = exynos_info->mpll_freq_khz;
- struct device *dev = exynos_info->dev;
- unsigned int old_freq;
- int index, old_index;
- int ret = 0;
-
- old_freq = policy->cur;
-
- /*
- * The policy max have been changed so that we cannot get proper
- * old_index with cpufreq_frequency_table_target(). Thus, ignore
- * policy and get the index from the raw frequency table.
- */
- old_index = exynos_cpufreq_get_index(old_freq);
- if (old_index < 0) {
- ret = old_index;
- goto out;
- }
-
- index = exynos_cpufreq_get_index(target_freq);
- if (index < 0) {
- ret = index;
- goto out;
- }
-
- /*
- * ARM clock source will be changed APLL to MPLL temporary
- * To support this level, need to control regulator for
- * required voltage level
- */
- if (exynos_info->need_apll_change != NULL) {
- if (exynos_info->need_apll_change(old_index, index) &&
- (freq_table[index].frequency < mpll_freq_khz) &&
- (freq_table[old_index].frequency < mpll_freq_khz))
- safe_arm_volt = volt_table[exynos_info->pll_safe_idx];
- }
- arm_volt = volt_table[index];
-
- /* When the new frequency is higher than current frequency */
- if ((target_freq > old_freq) && !safe_arm_volt) {
- /* Firstly, voltage up to increase frequency */
- ret = regulator_set_voltage(arm_regulator, arm_volt, arm_volt);
- if (ret) {
- dev_err(dev, "failed to set cpu voltage to %d\n",
- arm_volt);
- return ret;
- }
- }
-
- if (safe_arm_volt) {
- ret = regulator_set_voltage(arm_regulator, safe_arm_volt,
- safe_arm_volt);
- if (ret) {
- dev_err(dev, "failed to set cpu voltage to %d\n",
- safe_arm_volt);
- return ret;
- }
- }
-
- exynos_info->set_freq(old_index, index);
-
- /* When the new frequency is lower than current frequency */
- if ((target_freq < old_freq) ||
- ((target_freq > old_freq) && safe_arm_volt)) {
- /* down the voltage after frequency change */
- ret = regulator_set_voltage(arm_regulator, arm_volt,
- arm_volt);
- if (ret) {
- dev_err(dev, "failed to set cpu voltage to %d\n",
- arm_volt);
- goto out;
- }
- }
-
-out:
- cpufreq_cpu_put(policy);
-
- return ret;
-}
-
-static int exynos_target(struct cpufreq_policy *policy, unsigned int index)
-{
- return exynos_cpufreq_scale(exynos_info->freq_table[index].frequency);
-}
-
-static int exynos_cpufreq_cpu_init(struct cpufreq_policy *policy)
-{
- policy->clk = exynos_info->cpu_clk;
- policy->suspend_freq = locking_frequency;
- return cpufreq_generic_init(policy, exynos_info->freq_table, 100000);
-}
-
-static struct cpufreq_driver exynos_driver = {
- .flags = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK,
- .verify = cpufreq_generic_frequency_table_verify,
- .target_index = exynos_target,
- .get = cpufreq_generic_get,
- .init = exynos_cpufreq_cpu_init,
- .name = "exynos_cpufreq",
- .attr = cpufreq_generic_attr,
-#ifdef CONFIG_ARM_EXYNOS_CPU_FREQ_BOOST_SW
- .boost_supported = true,
-#endif
-#ifdef CONFIG_PM
- .suspend = cpufreq_generic_suspend,
-#endif
-};
-
-static int exynos_cpufreq_probe(struct platform_device *pdev)
-{
- struct device_node *cpu0;
- int ret = -EINVAL;
-
- exynos_info = kzalloc(sizeof(*exynos_info), GFP_KERNEL);
- if (!exynos_info)
- return -ENOMEM;
-
- exynos_info->dev = &pdev->dev;
-
- if (of_machine_is_compatible("samsung,exynos4210")) {
- exynos_info->type = EXYNOS_SOC_4210;
- ret = exynos4210_cpufreq_init(exynos_info);
- } else if (of_machine_is_compatible("samsung,exynos4212")) {
- exynos_info->type = EXYNOS_SOC_4212;
- ret = exynos4x12_cpufreq_init(exynos_info);
- } else if (of_machine_is_compatible("samsung,exynos4412")) {
- exynos_info->type = EXYNOS_SOC_4412;
- ret = exynos4x12_cpufreq_init(exynos_info);
- } else if (of_machine_is_compatible("samsung,exynos5250")) {
- exynos_info->type = EXYNOS_SOC_5250;
- ret = exynos5250_cpufreq_init(exynos_info);
- } else {
- pr_err("%s: Unknown SoC type\n", __func__);
- return -ENODEV;
- }
-
- if (ret)
- goto err_vdd_arm;
-
- if (exynos_info->set_freq == NULL) {
- dev_err(&pdev->dev, "No set_freq function (ERR)\n");
- goto err_vdd_arm;
- }
-
- arm_regulator = regulator_get(NULL, "vdd_arm");
- if (IS_ERR(arm_regulator)) {
- dev_err(&pdev->dev, "failed to get resource vdd_arm\n");
- goto err_vdd_arm;
- }
-
- /* Done here as we want to capture boot frequency */
- locking_frequency = clk_get_rate(exynos_info->cpu_clk) / 1000;
-
- ret = cpufreq_register_driver(&exynos_driver);
- if (ret)
- goto err_cpufreq_reg;
-
- cpu0 = of_get_cpu_node(0, NULL);
- if (!cpu0) {
- pr_err("failed to find cpu0 node\n");
- return 0;
- }
-
- if (of_find_property(cpu0, "#cooling-cells", NULL)) {
- cdev = of_cpufreq_cooling_register(cpu0,
- cpu_present_mask);
- if (IS_ERR(cdev))
- pr_err("running cpufreq without cooling device: %ld\n",
- PTR_ERR(cdev));
- }
-
- return 0;
-
-err_cpufreq_reg:
- dev_err(&pdev->dev, "failed to register cpufreq driver\n");
- regulator_put(arm_regulator);
-err_vdd_arm:
- kfree(exynos_info);
- return -EINVAL;
-}
-
-static struct platform_driver exynos_cpufreq_platdrv = {
- .driver = {
- .name = "exynos-cpufreq",
- },
- .probe = exynos_cpufreq_probe,
-};
-module_platform_driver(exynos_cpufreq_platdrv);
Code Review / kvmfornfv.git / blobdiff