diff options
Diffstat (limited to 'arch/arm/mach-tegra/cpu-tegra.c')
| -rw-r--r-- | arch/arm/mach-tegra/cpu-tegra.c | 185 |
1 files changed, 0 insertions, 185 deletions
diff --git a/arch/arm/mach-tegra/cpu-tegra.c b/arch/arm/mach-tegra/cpu-tegra.c deleted file mode 100644 index fea5719c707..00000000000 --- a/arch/arm/mach-tegra/cpu-tegra.c +++ /dev/null @@ -1,185 +0,0 @@ -/* - * arch/arm/mach-tegra/cpu-tegra.c - * - * Copyright (C) 2010 Google, Inc. - * - * Author: - * Colin Cross <ccross@google.com> - * Based on arch/arm/plat-omap/cpu-omap.c, (C) 2005 Nokia Corporation - * - * This software is licensed under the terms of the GNU General Public - * License version 2, as published by the Free Software Foundation, and - * may be copied, distributed, and modified under those terms. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/types.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 <asm/system.h> - -#include <mach/hardware.h> -#include <mach/clk.h> - -/* Frequency table index must be sequential starting at 0 */ -static struct cpufreq_frequency_table freq_table[] = { - { 0, 312000 }, - { 1, 456000 }, - { 2, 608000 }, - { 3, 760000 }, - { 4, 816000 }, - { 5, 912000 }, - { 6, 1000000 }, - { 7, CPUFREQ_TABLE_END }, -}; - -#define NUM_CPUS 2 - -static struct clk *cpu_clk; - -static unsigned long target_cpu_speed[NUM_CPUS]; - -int tegra_verify_speed(struct cpufreq_policy *policy) -{ - return cpufreq_frequency_table_verify(policy, freq_table); -} - -unsigned int tegra_getspeed(unsigned int cpu) -{ - unsigned long rate; - - if (cpu >= NUM_CPUS) - return 0; - - rate = clk_get_rate(cpu_clk) / 1000; - return rate; -} - -static int tegra_update_cpu_speed(void) -{ - int i; - unsigned long rate = 0; - int ret = 0; - struct cpufreq_freqs freqs; - - for_each_online_cpu(i) - rate = max(rate, target_cpu_speed[i]); - - freqs.old = tegra_getspeed(0); - freqs.new = rate; - - if (freqs.old == freqs.new) - return ret; - - for_each_online_cpu(freqs.cpu) - cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); - -#ifdef CONFIG_CPU_FREQ_DEBUG - printk(KERN_DEBUG "cpufreq-tegra: transition: %u --> %u\n", - freqs.old, freqs.new); -#endif - - ret = clk_set_rate_cansleep(cpu_clk, freqs.new * 1000); - if (ret) { - pr_err("cpu-tegra: Failed to set cpu frequency to %d kHz\n", - freqs.new); - return ret; - } - - for_each_online_cpu(freqs.cpu) - cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); - - return 0; -} - -static int tegra_target(struct cpufreq_policy *policy, - unsigned int target_freq, - unsigned int relation) -{ - int idx; - unsigned int freq; - - cpufreq_frequency_table_target(policy, freq_table, target_freq, - relation, &idx); - - freq = freq_table[idx].frequency; - - target_cpu_speed[policy->cpu] = freq; - - return tegra_update_cpu_speed(); -} - -static int tegra_cpu_init(struct cpufreq_policy *policy) -{ - if (policy->cpu >= NUM_CPUS) - return -EINVAL; - - cpu_clk = clk_get_sys(NULL, "cpu"); - if (IS_ERR(cpu_clk)) - return PTR_ERR(cpu_clk); - - cpufreq_frequency_table_cpuinfo(policy, freq_table); - cpufreq_frequency_table_get_attr(freq_table, policy->cpu); - policy->cur = tegra_getspeed(policy->cpu); - target_cpu_speed[policy->cpu] = policy->cur; - - /* FIXME: what's the actual transition time? */ - policy->cpuinfo.transition_latency = 300 * 1000; - - policy->shared_type = CPUFREQ_SHARED_TYPE_ALL; - cpumask_copy(policy->related_cpus, cpu_possible_mask); - - return 0; -} - -static int tegra_cpu_exit(struct cpufreq_policy *policy) -{ - cpufreq_frequency_table_cpuinfo(policy, freq_table); - clk_put(cpu_clk); - return 0; -} - -static struct freq_attr *tegra_cpufreq_attr[] = { - &cpufreq_freq_attr_scaling_available_freqs, - NULL, -}; - -static struct cpufreq_driver tegra_cpufreq_driver = { - .verify = tegra_verify_speed, - .target = tegra_target, - .get = tegra_getspeed, - .init = tegra_cpu_init, - .exit = tegra_cpu_exit, - .name = "tegra", - .attr = tegra_cpufreq_attr, -}; - -static int __init tegra_cpufreq_init(void) -{ - return cpufreq_register_driver(&tegra_cpufreq_driver); -} - -static void __exit tegra_cpufreq_exit(void) -{ - cpufreq_unregister_driver(&tegra_cpufreq_driver); -} - - -MODULE_AUTHOR("Colin Cross <ccross@android.com>"); -MODULE_DESCRIPTION("cpufreq driver for Nvidia Tegra2"); -MODULE_LICENSE("GPL"); -module_init(tegra_cpufreq_init); -module_exit(tegra_cpufreq_exit); |