diff options
Diffstat (limited to 'drivers/cpufreq/sh-cpufreq.c')
| -rw-r--r-- | drivers/cpufreq/sh-cpufreq.c | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/drivers/cpufreq/sh-cpufreq.c b/drivers/cpufreq/sh-cpufreq.c new file mode 100644 index 000000000..0ac265d47 --- /dev/null +++ b/drivers/cpufreq/sh-cpufreq.c @@ -0,0 +1,187 @@ +/* + * 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); + +struct cpufreq_target { + struct cpufreq_policy *policy; + unsigned int freq; +}; + +static unsigned int sh_cpufreq_get(unsigned int cpu) +{ + return (clk_get_rate(&per_cpu(sh_cpuclk, cpu)) + 500) / 1000; +} + +static long __sh_cpufreq_target(void *arg) +{ + struct cpufreq_target *target = arg; + struct cpufreq_policy *policy = target->policy; + int cpu = policy->cpu; + struct clk *cpuclk = &per_cpu(sh_cpuclk, cpu); + struct cpufreq_freqs freqs; + struct device *dev; + long freq; + + if (smp_processor_id() != cpu) + return -ENODEV; + + 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.old = sh_cpufreq_get(cpu); + freqs.new = (freq + 500) / 1000; + freqs.flags = 0; + + cpufreq_freq_transition_begin(target->policy, &freqs); + clk_set_rate(cpuclk, freq); + cpufreq_freq_transition_end(target->policy, &freqs, 0); + + dev_dbg(dev, "set frequency %lu Hz\n", freq); + return 0; +} + +/* + * 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) +{ + struct cpufreq_target data = { .policy = policy, .freq = target_freq }; + + return work_on_cpu(policy->cpu, __sh_cpufreq_target, &data); +} + +static int sh_cpufreq_verify(struct cpufreq_policy_data *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_cpu_limits(policy); + + policy->min = (clk_round_rate(cpuclk, 1) + 500) / 1000; + policy->max = (clk_round_rate(cpuclk, ~0UL) + 500) / 1000; + + cpufreq_verify_within_cpu_limits(policy); + 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; + + 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); + } + + freq_table = cpuclk->nr_freqs ? cpuclk->freq_table : NULL; + if (freq_table) { + policy->freq_table = freq_table; + } else { + dev_notice(dev, "no frequency table found, falling back " + "to rate rounding.\n"); + + policy->min = policy->cpuinfo.min_freq = + (clk_round_rate(cpuclk, 1) + 500) / 1000; + policy->max = policy->cpuinfo.max_freq = + (clk_round_rate(cpuclk, ~0UL) + 500) / 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); + + clk_put(cpuclk); + + return 0; +} + +static void sh_cpufreq_cpu_ready(struct cpufreq_policy *policy) +{ + struct device *dev = get_cpu_device(policy->cpu); + + 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); +} + +static struct cpufreq_driver sh_cpufreq_driver = { + .name = "sh", + .flags = CPUFREQ_NO_AUTO_DYNAMIC_SWITCHING, + .get = sh_cpufreq_get, + .target = sh_cpufreq_target, + .verify = sh_cpufreq_verify, + .init = sh_cpufreq_cpu_init, + .exit = sh_cpufreq_cpu_exit, + .ready = sh_cpufreq_cpu_ready, + .attr = cpufreq_generic_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"); |