diff options
Diffstat (limited to 'arch/sh/kernel/cpufreq.c')
| -rw-r--r-- | arch/sh/kernel/cpufreq.c | 201 |
1 files changed, 0 insertions, 201 deletions
diff --git a/arch/sh/kernel/cpufreq.c b/arch/sh/kernel/cpufreq.c deleted file mode 100644 index e68b45b6f3f..00000000000 --- a/arch/sh/kernel/cpufreq.c +++ /dev/null @@ -1,201 +0,0 @@ -/* - * arch/sh/kernel/cpufreq.c - * - * cpufreq driver for the SuperH processors. - * - * Copyright (C) 2002 - 2012 Paul Mundt - * Copyright (C) 2002 M. R. Brown - * - * Clock framework bits from arch/avr32/mach-at32ap/cpufreq.c - * - * Copyright (C) 2004-2007 Atmel Corporation - * - * This file is subject to the terms and conditions of the GNU General Public - * License. See the file "COPYING" in the main directory of this archive - * for more details. - */ -#define pr_fmt(fmt) "cpufreq: " fmt - -#include <linux/types.h> -#include <linux/cpufreq.h> -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/init.h> -#include <linux/err.h> -#include <linux/cpumask.h> -#include <linux/cpu.h> -#include <linux/smp.h> -#include <linux/sched.h> /* set_cpus_allowed() */ -#include <linux/clk.h> -#include <linux/percpu.h> -#include <linux/sh_clk.h> - -static DEFINE_PER_CPU(struct clk, sh_cpuclk); - -static unsigned int sh_cpufreq_get(unsigned int cpu) -{ - return (clk_get_rate(&per_cpu(sh_cpuclk, cpu)) + 500) / 1000; -} - -/* - * Here we notify other drivers of the proposed change and the final change. - */ -static int sh_cpufreq_target(struct cpufreq_policy *policy, - unsigned int target_freq, - unsigned int relation) -{ - unsigned int cpu = policy->cpu; - struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu); - cpumask_t cpus_allowed; - struct cpufreq_freqs freqs; - struct device *dev; - long freq; - - if (!cpu_online(cpu)) - return -ENODEV; - - cpus_allowed = current->cpus_allowed; - set_cpus_allowed_ptr(current, cpumask_of(cpu)); - - BUG_ON(smp_processor_id() != cpu); - - dev = get_cpu_device(cpu); - - /* Convert target_freq from kHz to Hz */ - freq = clk_round_rate(cpuclk, target_freq * 1000); - - if (freq < (policy->min * 1000) || freq > (policy->max * 1000)) - return -EINVAL; - - dev_dbg(dev, "requested frequency %u Hz\n", target_freq * 1000); - - freqs.cpu = cpu; - freqs.old = sh_cpufreq_get(cpu); - freqs.new = (freq + 500) / 1000; - freqs.flags = 0; - - cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); - set_cpus_allowed_ptr(current, &cpus_allowed); - clk_set_rate(cpuclk, freq); - cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); - - dev_dbg(dev, "set frequency %lu Hz\n", freq); - - return 0; -} - -static int sh_cpufreq_verify(struct cpufreq_policy *policy) -{ - struct clk *cpuclk = &per_cpu(sh_cpuclk, policy->cpu); - struct cpufreq_frequency_table *freq_table; - - freq_table = cpuclk->nr_freqs ? cpuclk->freq_table : NULL; - if (freq_table) - return cpufreq_frequency_table_verify(policy, freq_table); - - cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, - policy->cpuinfo.max_freq); - - policy->min = (clk_round_rate(cpuclk, 1) + 500) / 1000; - policy->max = (clk_round_rate(cpuclk, ~0UL) + 500) / 1000; - - cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, - policy->cpuinfo.max_freq); - - return 0; -} - -static int sh_cpufreq_cpu_init(struct cpufreq_policy *policy) -{ - unsigned int cpu = policy->cpu; - struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu); - struct cpufreq_frequency_table *freq_table; - struct device *dev; - - if (!cpu_online(cpu)) - return -ENODEV; - - dev = get_cpu_device(cpu); - - cpuclk = clk_get(dev, "cpu_clk"); - if (IS_ERR(cpuclk)) { - dev_err(dev, "couldn't get CPU clk\n"); - return PTR_ERR(cpuclk); - } - - policy->cur = policy->min = policy->max = sh_cpufreq_get(cpu); - - freq_table = cpuclk->nr_freqs ? cpuclk->freq_table : NULL; - if (freq_table) { - int result; - - result = cpufreq_frequency_table_cpuinfo(policy, freq_table); - if (!result) - cpufreq_frequency_table_get_attr(freq_table, cpu); - } else { - dev_notice(dev, "no frequency table found, falling back " - "to rate rounding.\n"); - - policy->cpuinfo.min_freq = - (clk_round_rate(cpuclk, 1) + 500) / 1000; - policy->cpuinfo.max_freq = - (clk_round_rate(cpuclk, ~0UL) + 500) / 1000; - } - - policy->min = policy->cpuinfo.min_freq; - policy->max = policy->cpuinfo.max_freq; - - policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; - - dev_info(dev, "CPU Frequencies - Minimum %u.%03u MHz, " - "Maximum %u.%03u MHz.\n", - policy->min / 1000, policy->min % 1000, - policy->max / 1000, policy->max % 1000); - - return 0; -} - -static int sh_cpufreq_cpu_exit(struct cpufreq_policy *policy) -{ - unsigned int cpu = policy->cpu; - struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu); - - cpufreq_frequency_table_put_attr(cpu); - clk_put(cpuclk); - - return 0; -} - -static struct freq_attr *sh_freq_attr[] = { - &cpufreq_freq_attr_scaling_available_freqs, - NULL, -}; - -static struct cpufreq_driver sh_cpufreq_driver = { - .owner = THIS_MODULE, - .name = "sh", - .get = sh_cpufreq_get, - .target = sh_cpufreq_target, - .verify = sh_cpufreq_verify, - .init = sh_cpufreq_cpu_init, - .exit = sh_cpufreq_cpu_exit, - .attr = sh_freq_attr, -}; - -static int __init sh_cpufreq_module_init(void) -{ - pr_notice("SuperH CPU frequency driver.\n"); - return cpufreq_register_driver(&sh_cpufreq_driver); -} - -static void __exit sh_cpufreq_module_exit(void) -{ - cpufreq_unregister_driver(&sh_cpufreq_driver); -} - -module_init(sh_cpufreq_module_init); -module_exit(sh_cpufreq_module_exit); - -MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>"); -MODULE_DESCRIPTION("cpufreq driver for SuperH"); -MODULE_LICENSE("GPL"); |