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![Viresh Kumar](/assets/img/avatar_default.png)
The cpufreq core is already validating the CPU frequency table after calling the ->init() callback of the cpufreq drivers and the drivers don't need to do the same anymore. Though they need to set the policy->freq_table field directly from the ->init() callback now. Stop validating the frequency table from sh-cpufreq driver. The driver though prints the min/max frequency values and the same is done from the ->ready() callback now to keep the behavior unchanged. Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
187 lines
4.8 KiB
C
187 lines
4.8 KiB
C
/*
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* cpufreq driver for the SuperH processors.
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*
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* Copyright (C) 2002 - 2012 Paul Mundt
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* Copyright (C) 2002 M. R. Brown
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*
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* Clock framework bits from arch/avr32/mach-at32ap/cpufreq.c
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*
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* Copyright (C) 2004-2007 Atmel Corporation
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#define pr_fmt(fmt) "cpufreq: " fmt
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#include <linux/types.h>
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#include <linux/cpufreq.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/cpumask.h>
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#include <linux/cpu.h>
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#include <linux/smp.h>
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#include <linux/sched.h> /* set_cpus_allowed() */
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#include <linux/clk.h>
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#include <linux/percpu.h>
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#include <linux/sh_clk.h>
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static DEFINE_PER_CPU(struct clk, sh_cpuclk);
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struct cpufreq_target {
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struct cpufreq_policy *policy;
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unsigned int freq;
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};
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static unsigned int sh_cpufreq_get(unsigned int cpu)
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{
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return (clk_get_rate(&per_cpu(sh_cpuclk, cpu)) + 500) / 1000;
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}
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static long __sh_cpufreq_target(void *arg)
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{
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struct cpufreq_target *target = arg;
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struct cpufreq_policy *policy = target->policy;
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int cpu = policy->cpu;
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struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);
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struct cpufreq_freqs freqs;
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struct device *dev;
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long freq;
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if (smp_processor_id() != cpu)
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return -ENODEV;
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dev = get_cpu_device(cpu);
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/* Convert target_freq from kHz to Hz */
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freq = clk_round_rate(cpuclk, target->freq * 1000);
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if (freq < (policy->min * 1000) || freq > (policy->max * 1000))
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return -EINVAL;
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dev_dbg(dev, "requested frequency %u Hz\n", target->freq * 1000);
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freqs.old = sh_cpufreq_get(cpu);
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freqs.new = (freq + 500) / 1000;
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freqs.flags = 0;
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cpufreq_freq_transition_begin(target->policy, &freqs);
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clk_set_rate(cpuclk, freq);
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cpufreq_freq_transition_end(target->policy, &freqs, 0);
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dev_dbg(dev, "set frequency %lu Hz\n", freq);
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return 0;
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}
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/*
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* Here we notify other drivers of the proposed change and the final change.
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*/
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static int sh_cpufreq_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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struct cpufreq_target data = { .policy = policy, .freq = target_freq };
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return work_on_cpu(policy->cpu, __sh_cpufreq_target, &data);
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}
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static int sh_cpufreq_verify(struct cpufreq_policy *policy)
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{
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struct clk *cpuclk = &per_cpu(sh_cpuclk, policy->cpu);
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struct cpufreq_frequency_table *freq_table;
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freq_table = cpuclk->nr_freqs ? cpuclk->freq_table : NULL;
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if (freq_table)
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return cpufreq_frequency_table_verify(policy, freq_table);
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cpufreq_verify_within_cpu_limits(policy);
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policy->min = (clk_round_rate(cpuclk, 1) + 500) / 1000;
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policy->max = (clk_round_rate(cpuclk, ~0UL) + 500) / 1000;
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cpufreq_verify_within_cpu_limits(policy);
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return 0;
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}
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static int sh_cpufreq_cpu_init(struct cpufreq_policy *policy)
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{
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unsigned int cpu = policy->cpu;
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struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);
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struct cpufreq_frequency_table *freq_table;
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struct device *dev;
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dev = get_cpu_device(cpu);
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cpuclk = clk_get(dev, "cpu_clk");
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if (IS_ERR(cpuclk)) {
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dev_err(dev, "couldn't get CPU clk\n");
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return PTR_ERR(cpuclk);
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}
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freq_table = cpuclk->nr_freqs ? cpuclk->freq_table : NULL;
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if (freq_table) {
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policy->freq_table = freq_table;
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} else {
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dev_notice(dev, "no frequency table found, falling back "
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"to rate rounding.\n");
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policy->min = policy->cpuinfo.min_freq =
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(clk_round_rate(cpuclk, 1) + 500) / 1000;
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policy->max = policy->cpuinfo.max_freq =
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(clk_round_rate(cpuclk, ~0UL) + 500) / 1000;
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}
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return 0;
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}
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static int sh_cpufreq_cpu_exit(struct cpufreq_policy *policy)
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{
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unsigned int cpu = policy->cpu;
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struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu);
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clk_put(cpuclk);
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return 0;
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}
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static void sh_cpufreq_cpu_ready(struct cpufreq_policy *policy)
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{
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struct device *dev = get_cpu_device(policy->cpu);
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dev_info(dev, "CPU Frequencies - Minimum %u.%03u MHz, "
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"Maximum %u.%03u MHz.\n",
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policy->min / 1000, policy->min % 1000,
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policy->max / 1000, policy->max % 1000);
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}
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static struct cpufreq_driver sh_cpufreq_driver = {
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.name = "sh",
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.flags = CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING,
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.get = sh_cpufreq_get,
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.target = sh_cpufreq_target,
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.verify = sh_cpufreq_verify,
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.init = sh_cpufreq_cpu_init,
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.exit = sh_cpufreq_cpu_exit,
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.ready = sh_cpufreq_cpu_ready,
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.attr = cpufreq_generic_attr,
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};
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static int __init sh_cpufreq_module_init(void)
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{
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pr_notice("SuperH CPU frequency driver.\n");
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return cpufreq_register_driver(&sh_cpufreq_driver);
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}
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static void __exit sh_cpufreq_module_exit(void)
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{
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cpufreq_unregister_driver(&sh_cpufreq_driver);
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}
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module_init(sh_cpufreq_module_init);
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module_exit(sh_cpufreq_module_exit);
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MODULE_AUTHOR("Paul Mundt <lethal@linux-sh.org>");
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MODULE_DESCRIPTION("cpufreq driver for SuperH");
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MODULE_LICENSE("GPL");
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