2010-04-23 05:30:13 +02:00
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/*
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* arch/arm/mach-tegra/cpu-tegra.c
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*
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* Copyright (C) 2010 Google, Inc.
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*
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* Author:
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* Colin Cross <ccross@google.com>
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* Based on arch/arm/plat-omap/cpu-omap.c, (C) 2005 Nokia Corporation
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/cpufreq.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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2010-08-06 02:40:39 +02:00
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#include <linux/suspend.h>
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2010-04-23 05:30:13 +02:00
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#include <asm/system.h>
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#include <mach/hardware.h>
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#include <mach/clk.h>
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/* Frequency table index must be sequential starting at 0 */
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static struct cpufreq_frequency_table freq_table[] = {
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2010-08-06 02:40:39 +02:00
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{ 0, 216000 },
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{ 1, 312000 },
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{ 2, 456000 },
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{ 3, 608000 },
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{ 4, 760000 },
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{ 5, 816000 },
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{ 6, 912000 },
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{ 7, 1000000 },
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{ 8, CPUFREQ_TABLE_END },
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2010-04-23 05:30:13 +02:00
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};
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#define NUM_CPUS 2
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static struct clk *cpu_clk;
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static unsigned long target_cpu_speed[NUM_CPUS];
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2010-08-06 02:40:39 +02:00
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static DEFINE_MUTEX(tegra_cpu_lock);
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static bool is_suspended;
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2010-04-23 05:30:13 +02:00
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int tegra_verify_speed(struct cpufreq_policy *policy)
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{
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return cpufreq_frequency_table_verify(policy, freq_table);
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}
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unsigned int tegra_getspeed(unsigned int cpu)
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{
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unsigned long rate;
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if (cpu >= NUM_CPUS)
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return 0;
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rate = clk_get_rate(cpu_clk) / 1000;
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return rate;
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}
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2010-08-06 02:40:39 +02:00
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static int tegra_update_cpu_speed(unsigned long rate)
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2010-04-23 05:30:13 +02:00
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{
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int ret = 0;
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struct cpufreq_freqs freqs;
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freqs.old = tegra_getspeed(0);
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freqs.new = rate;
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if (freqs.old == freqs.new)
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return ret;
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for_each_online_cpu(freqs.cpu)
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cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
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#ifdef CONFIG_CPU_FREQ_DEBUG
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printk(KERN_DEBUG "cpufreq-tegra: transition: %u --> %u\n",
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freqs.old, freqs.new);
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#endif
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2011-02-13 00:52:04 +01:00
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ret = clk_set_rate(cpu_clk, freqs.new * 1000);
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2010-04-23 05:30:13 +02:00
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if (ret) {
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pr_err("cpu-tegra: Failed to set cpu frequency to %d kHz\n",
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freqs.new);
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return ret;
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}
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for_each_online_cpu(freqs.cpu)
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cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
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return 0;
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}
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2010-08-06 02:40:39 +02:00
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static unsigned long tegra_cpu_highest_speed(void)
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{
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unsigned long rate = 0;
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int i;
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for_each_online_cpu(i)
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rate = max(rate, target_cpu_speed[i]);
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return rate;
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}
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2010-04-23 05:30:13 +02:00
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static int tegra_target(struct cpufreq_policy *policy,
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unsigned int target_freq,
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unsigned int relation)
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{
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int idx;
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unsigned int freq;
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2010-08-06 02:40:39 +02:00
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int ret = 0;
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mutex_lock(&tegra_cpu_lock);
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if (is_suspended) {
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ret = -EBUSY;
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goto out;
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}
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2010-04-23 05:30:13 +02:00
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cpufreq_frequency_table_target(policy, freq_table, target_freq,
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relation, &idx);
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freq = freq_table[idx].frequency;
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target_cpu_speed[policy->cpu] = freq;
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2010-08-06 02:40:39 +02:00
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ret = tegra_update_cpu_speed(tegra_cpu_highest_speed());
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out:
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mutex_unlock(&tegra_cpu_lock);
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return ret;
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2010-04-23 05:30:13 +02:00
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}
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2010-08-06 02:40:39 +02:00
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static int tegra_pm_notify(struct notifier_block *nb, unsigned long event,
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void *dummy)
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{
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mutex_lock(&tegra_cpu_lock);
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if (event == PM_SUSPEND_PREPARE) {
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is_suspended = true;
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pr_info("Tegra cpufreq suspend: setting frequency to %d kHz\n",
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freq_table[0].frequency);
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tegra_update_cpu_speed(freq_table[0].frequency);
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} else if (event == PM_POST_SUSPEND) {
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is_suspended = false;
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}
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mutex_unlock(&tegra_cpu_lock);
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return NOTIFY_OK;
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}
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static struct notifier_block tegra_cpu_pm_notifier = {
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.notifier_call = tegra_pm_notify,
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};
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2010-04-23 05:30:13 +02:00
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static int tegra_cpu_init(struct cpufreq_policy *policy)
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{
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if (policy->cpu >= NUM_CPUS)
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return -EINVAL;
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cpu_clk = clk_get_sys(NULL, "cpu");
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if (IS_ERR(cpu_clk))
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return PTR_ERR(cpu_clk);
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cpufreq_frequency_table_cpuinfo(policy, freq_table);
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cpufreq_frequency_table_get_attr(freq_table, policy->cpu);
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policy->cur = tegra_getspeed(policy->cpu);
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target_cpu_speed[policy->cpu] = policy->cur;
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/* FIXME: what's the actual transition time? */
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policy->cpuinfo.transition_latency = 300 * 1000;
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policy->shared_type = CPUFREQ_SHARED_TYPE_ALL;
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cpumask_copy(policy->related_cpus, cpu_possible_mask);
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2010-08-06 02:40:39 +02:00
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if (policy->cpu == 0)
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register_pm_notifier(&tegra_cpu_pm_notifier);
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2010-04-23 05:30:13 +02:00
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return 0;
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}
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static int tegra_cpu_exit(struct cpufreq_policy *policy)
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{
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cpufreq_frequency_table_cpuinfo(policy, freq_table);
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clk_put(cpu_clk);
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return 0;
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}
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static struct freq_attr *tegra_cpufreq_attr[] = {
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&cpufreq_freq_attr_scaling_available_freqs,
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NULL,
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};
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static struct cpufreq_driver tegra_cpufreq_driver = {
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.verify = tegra_verify_speed,
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.target = tegra_target,
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.get = tegra_getspeed,
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.init = tegra_cpu_init,
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.exit = tegra_cpu_exit,
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.name = "tegra",
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.attr = tegra_cpufreq_attr,
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};
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static int __init tegra_cpufreq_init(void)
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{
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return cpufreq_register_driver(&tegra_cpufreq_driver);
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}
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static void __exit tegra_cpufreq_exit(void)
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{
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cpufreq_unregister_driver(&tegra_cpufreq_driver);
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}
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MODULE_AUTHOR("Colin Cross <ccross@android.com>");
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MODULE_DESCRIPTION("cpufreq driver for Nvidia Tegra2");
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MODULE_LICENSE("GPL");
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module_init(tegra_cpufreq_init);
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module_exit(tegra_cpufreq_exit);
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