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author | Viresh Kumar <viresh.kumar@linaro.org> | 2013-04-04 12:54:21 (GMT) |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2013-04-10 11:19:25 (GMT) |
commit | 7a9989356b23fa2c7731632d3b575c53c1ac8bce (patch) | |
tree | e4fa7384b7dfc08173a82b4e45bce0c91fdc4021 /drivers/cpufreq | |
parent | ab423e435f1eafdb9a071fe8a9942b2522d09d2d (diff) | |
download | linux-7a9989356b23fa2c7731632d3b575c53c1ac8bce.tar.xz |
cpufreq: mips: move cpufreq driver to drivers/cpufreq
This patch moves cpufreq driver of MIPS architecture to drivers/cpufreq.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: John Crispin <blogic@openwrt.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r-- | drivers/cpufreq/Kconfig | 18 | ||||
-rw-r--r-- | drivers/cpufreq/Makefile | 1 | ||||
-rw-r--r-- | drivers/cpufreq/loongson2_cpufreq.c | 248 |
3 files changed, 267 insertions, 0 deletions
diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig index a2f1600..5030df5 100644 --- a/drivers/cpufreq/Kconfig +++ b/drivers/cpufreq/Kconfig @@ -235,6 +235,24 @@ config IA64_ACPI_CPUFREQ endmenu +menu "MIPS CPUFreq processor drivers" +depends on MIPS + +config LOONGSON2_CPUFREQ + tristate "Loongson2 CPUFreq Driver" + select CPU_FREQ_TABLE + help + This option adds a CPUFreq driver for loongson processors which + support software configurable cpu frequency. + + Loongson2F and it's successors support this feature. + + For details, take a look at <file:Documentation/cpu-freq/>. + + If in doubt, say N. + +endmenu + menu "PowerPC CPU frequency scaling drivers" depends on PPC32 || PPC64 source "drivers/cpufreq/Kconfig.powerpc" diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile index ab68133..9659cbb 100644 --- a/drivers/cpufreq/Makefile +++ b/drivers/cpufreq/Makefile @@ -82,3 +82,4 @@ obj-$(CONFIG_BLACKFIN) += blackfin-cpufreq.o obj-$(CONFIG_CRIS_MACH_ARTPEC3) += cris-artpec3-cpufreq.o obj-$(CONFIG_ETRAXFS) += cris-etraxfs-cpufreq.o obj-$(CONFIG_IA64_ACPI_CPUFREQ) += ia64-acpi-cpufreq.o +obj-$(CONFIG_LOONGSON2_CPUFREQ) += loongson2_cpufreq.o diff --git a/drivers/cpufreq/loongson2_cpufreq.c b/drivers/cpufreq/loongson2_cpufreq.c new file mode 100644 index 0000000..8488957 --- /dev/null +++ b/drivers/cpufreq/loongson2_cpufreq.c @@ -0,0 +1,248 @@ +/* + * Cpufreq driver for the loongson-2 processors + * + * The 2E revision of loongson processor not support this feature. + * + * Copyright (C) 2006 - 2008 Lemote Inc. & Insititute of Computing Technology + * Author: Yanhua, yanh@lemote.com + * + * 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/cpufreq.h> +#include <linux/module.h> +#include <linux/err.h> +#include <linux/sched.h> /* set_cpus_allowed() */ +#include <linux/delay.h> +#include <linux/platform_device.h> + +#include <asm/clock.h> + +#include <asm/mach-loongson/loongson.h> + +static uint nowait; + +static struct clk *cpuclk; + +static void (*saved_cpu_wait) (void); + +static int loongson2_cpu_freq_notifier(struct notifier_block *nb, + unsigned long val, void *data); + +static struct notifier_block loongson2_cpufreq_notifier_block = { + .notifier_call = loongson2_cpu_freq_notifier +}; + +static int loongson2_cpu_freq_notifier(struct notifier_block *nb, + unsigned long val, void *data) +{ + if (val == CPUFREQ_POSTCHANGE) + current_cpu_data.udelay_val = loops_per_jiffy; + + return 0; +} + +static unsigned int loongson2_cpufreq_get(unsigned int cpu) +{ + return clk_get_rate(cpuclk); +} + +/* + * Here we notify other drivers of the proposed change and the final change. + */ +static int loongson2_cpufreq_target(struct cpufreq_policy *policy, + unsigned int target_freq, + unsigned int relation) +{ + unsigned int cpu = policy->cpu; + unsigned int newstate = 0; + cpumask_t cpus_allowed; + struct cpufreq_freqs freqs; + unsigned int freq; + + cpus_allowed = current->cpus_allowed; + set_cpus_allowed_ptr(current, cpumask_of(cpu)); + + if (cpufreq_frequency_table_target + (policy, &loongson2_clockmod_table[0], target_freq, relation, + &newstate)) + return -EINVAL; + + freq = + ((cpu_clock_freq / 1000) * + loongson2_clockmod_table[newstate].index) / 8; + if (freq < policy->min || freq > policy->max) + return -EINVAL; + + pr_debug("cpufreq: requested frequency %u Hz\n", target_freq * 1000); + + freqs.old = loongson2_cpufreq_get(cpu); + freqs.new = freq; + freqs.flags = 0; + + if (freqs.new == freqs.old) + return 0; + + /* notifiers */ + cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE); + + set_cpus_allowed_ptr(current, &cpus_allowed); + + /* setting the cpu frequency */ + clk_set_rate(cpuclk, freq); + + /* notifiers */ + cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE); + + pr_debug("cpufreq: set frequency %u kHz\n", freq); + + return 0; +} + +static int loongson2_cpufreq_cpu_init(struct cpufreq_policy *policy) +{ + int i; + unsigned long rate; + int ret; + + cpuclk = clk_get(NULL, "cpu_clk"); + if (IS_ERR(cpuclk)) { + printk(KERN_ERR "cpufreq: couldn't get CPU clk\n"); + return PTR_ERR(cpuclk); + } + + rate = cpu_clock_freq / 1000; + if (!rate) { + clk_put(cpuclk); + return -EINVAL; + } + ret = clk_set_rate(cpuclk, rate); + if (ret) { + clk_put(cpuclk); + return ret; + } + + /* clock table init */ + for (i = 2; + (loongson2_clockmod_table[i].frequency != CPUFREQ_TABLE_END); + i++) + loongson2_clockmod_table[i].frequency = (rate * i) / 8; + + policy->cur = loongson2_cpufreq_get(policy->cpu); + + cpufreq_frequency_table_get_attr(&loongson2_clockmod_table[0], + policy->cpu); + + return cpufreq_frequency_table_cpuinfo(policy, + &loongson2_clockmod_table[0]); +} + +static int loongson2_cpufreq_verify(struct cpufreq_policy *policy) +{ + return cpufreq_frequency_table_verify(policy, + &loongson2_clockmod_table[0]); +} + +static int loongson2_cpufreq_exit(struct cpufreq_policy *policy) +{ + clk_put(cpuclk); + return 0; +} + +static struct freq_attr *loongson2_table_attr[] = { + &cpufreq_freq_attr_scaling_available_freqs, + NULL, +}; + +static struct cpufreq_driver loongson2_cpufreq_driver = { + .owner = THIS_MODULE, + .name = "loongson2", + .init = loongson2_cpufreq_cpu_init, + .verify = loongson2_cpufreq_verify, + .target = loongson2_cpufreq_target, + .get = loongson2_cpufreq_get, + .exit = loongson2_cpufreq_exit, + .attr = loongson2_table_attr, +}; + +static struct platform_device_id platform_device_ids[] = { + { + .name = "loongson2_cpufreq", + }, + {} +}; + +MODULE_DEVICE_TABLE(platform, platform_device_ids); + +static struct platform_driver platform_driver = { + .driver = { + .name = "loongson2_cpufreq", + .owner = THIS_MODULE, + }, + .id_table = platform_device_ids, +}; + +/* + * This is the simple version of Loongson-2 wait, Maybe we need do this in + * interrupt disabled context. + */ + +static DEFINE_SPINLOCK(loongson2_wait_lock); + +static void loongson2_cpu_wait(void) +{ + unsigned long flags; + u32 cpu_freq; + + spin_lock_irqsave(&loongson2_wait_lock, flags); + cpu_freq = LOONGSON_CHIPCFG0; + LOONGSON_CHIPCFG0 &= ~0x7; /* Put CPU into wait mode */ + LOONGSON_CHIPCFG0 = cpu_freq; /* Restore CPU state */ + spin_unlock_irqrestore(&loongson2_wait_lock, flags); +} + +static int __init cpufreq_init(void) +{ + int ret; + + /* Register platform stuff */ + ret = platform_driver_register(&platform_driver); + if (ret) + return ret; + + pr_info("cpufreq: Loongson-2F CPU frequency driver.\n"); + + cpufreq_register_notifier(&loongson2_cpufreq_notifier_block, + CPUFREQ_TRANSITION_NOTIFIER); + + ret = cpufreq_register_driver(&loongson2_cpufreq_driver); + + if (!ret && !nowait) { + saved_cpu_wait = cpu_wait; + cpu_wait = loongson2_cpu_wait; + } + + return ret; +} + +static void __exit cpufreq_exit(void) +{ + if (!nowait && saved_cpu_wait) + cpu_wait = saved_cpu_wait; + cpufreq_unregister_driver(&loongson2_cpufreq_driver); + cpufreq_unregister_notifier(&loongson2_cpufreq_notifier_block, + CPUFREQ_TRANSITION_NOTIFIER); + + platform_driver_unregister(&platform_driver); +} + +module_init(cpufreq_init); +module_exit(cpufreq_exit); + +module_param(nowait, uint, 0644); +MODULE_PARM_DESC(nowait, "Disable Loongson-2F specific wait"); + +MODULE_AUTHOR("Yanhua <yanh@lemote.com>"); +MODULE_DESCRIPTION("cpufreq driver for Loongson2F"); +MODULE_LICENSE("GPL"); |