From 7a9989356b23fa2c7731632d3b575c53c1ac8bce Mon Sep 17 00:00:00 2001 From: Viresh Kumar Date: Thu, 4 Apr 2013 12:54:21 +0000 Subject: cpufreq: mips: move cpufreq driver to drivers/cpufreq This patch moves cpufreq driver of MIPS architecture to drivers/cpufreq. Signed-off-by: Viresh Kumar Acked-by: John Crispin Signed-off-by: Rafael J. Wysocki --- arch/mips/Kconfig | 9 +- arch/mips/kernel/Makefile | 2 - arch/mips/kernel/cpufreq/Kconfig | 41 ----- arch/mips/kernel/cpufreq/Makefile | 5 - arch/mips/kernel/cpufreq/loongson2_cpufreq.c | 248 --------------------------- drivers/cpufreq/Kconfig | 18 ++ drivers/cpufreq/Makefile | 1 + drivers/cpufreq/loongson2_cpufreq.c | 248 +++++++++++++++++++++++++++ 8 files changed, 275 insertions(+), 297 deletions(-) delete mode 100644 arch/mips/kernel/cpufreq/Kconfig delete mode 100644 arch/mips/kernel/cpufreq/Makefile delete mode 100644 arch/mips/kernel/cpufreq/loongson2_cpufreq.c create mode 100644 drivers/cpufreq/loongson2_cpufreq.c diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index cd2e21ff562..22e8417b4fc 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -2539,7 +2539,14 @@ source "kernel/power/Kconfig" endmenu -source "arch/mips/kernel/cpufreq/Kconfig" +config MIPS_EXTERNAL_TIMER + bool + +if CPU_SUPPORTS_CPUFREQ && MIPS_EXTERNAL_TIMER +menu "CPU Power Management" +source "drivers/cpufreq/Kconfig" +endmenu +endif source "net/Kconfig" diff --git a/arch/mips/kernel/Makefile b/arch/mips/kernel/Makefile index f81d98f6184..c69ca653b07 100644 --- a/arch/mips/kernel/Makefile +++ b/arch/mips/kernel/Makefile @@ -92,8 +92,6 @@ CFLAGS_cpu-bugs64.o = $(shell if $(CC) $(KBUILD_CFLAGS) -Wa,-mdaddi -c -o /dev/n obj-$(CONFIG_HAVE_STD_PC_SERIAL_PORT) += 8250-platform.o -obj-$(CONFIG_MIPS_CPUFREQ) += cpufreq/ - obj-$(CONFIG_PERF_EVENTS) += perf_event.o obj-$(CONFIG_HW_PERF_EVENTS) += perf_event_mipsxx.o diff --git a/arch/mips/kernel/cpufreq/Kconfig b/arch/mips/kernel/cpufreq/Kconfig deleted file mode 100644 index 58c601eee6f..00000000000 --- a/arch/mips/kernel/cpufreq/Kconfig +++ /dev/null @@ -1,41 +0,0 @@ -# -# CPU Frequency scaling -# - -config MIPS_EXTERNAL_TIMER - bool - -config MIPS_CPUFREQ - bool - default y - depends on CPU_SUPPORTS_CPUFREQ && MIPS_EXTERNAL_TIMER - -if MIPS_CPUFREQ - -menu "CPU Frequency scaling" - -source "drivers/cpufreq/Kconfig" - -if CPU_FREQ - -comment "CPUFreq processor drivers" - -config LOONGSON2_CPUFREQ - tristate "Loongson2 CPUFreq Driver" - select CPU_FREQ_TABLE - depends on MIPS_CPUFREQ - help - This option adds a CPUFreq driver for loongson processors which - support software configurable cpu frequency. - - Loongson2F and it's successors support this feature. - - For details, take a look at . - - If in doubt, say N. - -endif # CPU_FREQ - -endmenu - -endif # MIPS_CPUFREQ diff --git a/arch/mips/kernel/cpufreq/Makefile b/arch/mips/kernel/cpufreq/Makefile deleted file mode 100644 index 05a5715ee38..00000000000 --- a/arch/mips/kernel/cpufreq/Makefile +++ /dev/null @@ -1,5 +0,0 @@ -# -# Makefile for the Linux/MIPS cpufreq. -# - -obj-$(CONFIG_LOONGSON2_CPUFREQ) += loongson2_cpufreq.o diff --git a/arch/mips/kernel/cpufreq/loongson2_cpufreq.c b/arch/mips/kernel/cpufreq/loongson2_cpufreq.c deleted file mode 100644 index 84889573b56..00000000000 --- a/arch/mips/kernel/cpufreq/loongson2_cpufreq.c +++ /dev/null @@ -1,248 +0,0 @@ -/* - * 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 -#include -#include -#include /* set_cpus_allowed() */ -#include -#include - -#include - -#include - -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 "); -MODULE_DESCRIPTION("cpufreq driver for Loongson2F"); -MODULE_LICENSE("GPL"); diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig index a2f1600c78f..5030df5cd3e 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 . + + 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 ab681337e6d..9659cbbad25 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 00000000000..84889573b56 --- /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 +#include +#include +#include /* set_cpus_allowed() */ +#include +#include + +#include + +#include + +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 "); +MODULE_DESCRIPTION("cpufreq driver for Loongson2F"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3