diff options
Diffstat (limited to 'arch/sh/kernel/cpufreq.c')
| -rw-r--r-- | arch/sh/kernel/cpufreq.c | 158 |
1 files changed, 0 insertions, 158 deletions
diff --git a/arch/sh/kernel/cpufreq.c b/arch/sh/kernel/cpufreq.c deleted file mode 100644 index 0fffacea6ed..00000000000 --- a/arch/sh/kernel/cpufreq.c +++ /dev/null @@ -1,158 +0,0 @@ -/* - * arch/sh/kernel/cpufreq.c - * - * cpufreq driver for the SuperH processors. - * - * Copyright (C) 2002 - 2007 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. - */ -#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/smp.h> -#include <linux/sched.h> /* set_cpus_allowed() */ -#include <linux/clk.h> - -static struct clk *cpuclk; - -static unsigned int sh_cpufreq_get(unsigned int cpu) -{ - return (clk_get_rate(cpuclk) + 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; - cpumask_t cpus_allowed; - struct cpufreq_freqs freqs; - 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); - - /* 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; - - pr_debug("cpufreq: 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); - - pr_debug("cpufreq: set frequency %lu Hz\n", freq); - - return 0; -} - -static int sh_cpufreq_cpu_init(struct cpufreq_policy *policy) -{ - if (!cpu_online(policy->cpu)) - return -ENODEV; - - cpuclk = clk_get(NULL, "cpu_clk"); - if (IS_ERR(cpuclk)) { - printk(KERN_ERR "cpufreq: couldn't get CPU#%d clk\n", - policy->cpu); - return PTR_ERR(cpuclk); - } - - /* cpuinfo and default policy values */ - policy->cpuinfo.min_freq = (clk_round_rate(cpuclk, 1) + 500) / 1000; - policy->cpuinfo.max_freq = (clk_round_rate(cpuclk, ~0UL) + 500) / 1000; - policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; - - policy->cur = sh_cpufreq_get(policy->cpu); - policy->min = policy->cpuinfo.min_freq; - policy->max = policy->cpuinfo.max_freq; - - /* - * Catch the cases where the clock framework hasn't been wired up - * properly to support scaling. - */ - if (unlikely(policy->min == policy->max)) { - printk(KERN_ERR "cpufreq: clock framework rate rounding " - "not supported on CPU#%d.\n", policy->cpu); - - clk_put(cpuclk); - return -EINVAL; - } - - printk(KERN_INFO "cpufreq: CPU#%d Frequencies - Minimum %u.%03u MHz, " - "Maximum %u.%03u MHz.\n", - policy->cpu, policy->min / 1000, policy->min % 1000, - policy->max / 1000, policy->max % 1000); - - return 0; -} - -static int sh_cpufreq_verify(struct cpufreq_policy *policy) -{ - cpufreq_verify_within_limits(policy, policy->cpuinfo.min_freq, - policy->cpuinfo.max_freq); - return 0; -} - -static int sh_cpufreq_exit(struct cpufreq_policy *policy) -{ - clk_put(cpuclk); - return 0; -} - -static struct cpufreq_driver sh_cpufreq_driver = { - .owner = THIS_MODULE, - .name = "sh", - .init = sh_cpufreq_cpu_init, - .verify = sh_cpufreq_verify, - .target = sh_cpufreq_target, - .get = sh_cpufreq_get, - .exit = sh_cpufreq_exit, -}; - -static int __init sh_cpufreq_module_init(void) -{ - printk(KERN_INFO "cpufreq: 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"); |