diff options
Diffstat (limited to 'drivers/cpuidle')
| -rw-r--r-- | drivers/cpuidle/Kconfig.arm | 25 | ||||
| -rw-r--r-- | drivers/cpuidle/Makefile | 3 | ||||
| -rw-r--r-- | drivers/cpuidle/cpuidle-at91.c | 69 | ||||
| -rw-r--r-- | drivers/cpuidle/cpuidle-ux500.c | 2 | ||||
| -rw-r--r-- | drivers/cpuidle/cpuidle-zynq.c | 17 |
5 files changed, 99 insertions, 17 deletions
diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm index 8e3660322308..f23bd75426cd 100644 --- a/drivers/cpuidle/Kconfig.arm +++ b/drivers/cpuidle/Kconfig.arm @@ -2,6 +2,17 @@ # ARM CPU Idle drivers # +config ARM_BIG_LITTLE_CPUIDLE + bool "Support for ARM big.LITTLE processors" + depends on ARCH_VEXPRESS_TC2_PM + select ARM_CPU_SUSPEND + select CPU_IDLE_MULTIPLE_DRIVERS + help + Select this option to enable CPU idle driver for big.LITTLE based + ARM systems. Driver manages CPUs coordination through MCPM and + define different C-states for little and big cores through the + multiple CPU idle drivers infrastructure. + config ARM_HIGHBANK_CPUIDLE bool "CPU Idle Driver for Calxeda processors" depends on ARCH_HIGHBANK @@ -27,13 +38,9 @@ config ARM_U8500_CPUIDLE help Select this to enable cpuidle for ST-E u8500 processors -config CPU_IDLE_BIG_LITTLE - bool "Support for ARM big.LITTLE processors" - depends on ARCH_VEXPRESS_TC2_PM - select ARM_CPU_SUSPEND - select CPU_IDLE_MULTIPLE_DRIVERS +config ARM_AT91_CPUIDLE + bool "Cpu Idle Driver for the AT91 processors" + default y + depends on ARCH_AT91 help - Select this option to enable CPU idle driver for big.LITTLE based - ARM systems. Driver manages CPUs coordination through MCPM and - define different C-states for little and big cores through the - multiple CPU idle drivers infrastructure. + Select this to enable cpuidle for AT91 processors diff --git a/drivers/cpuidle/Makefile b/drivers/cpuidle/Makefile index cea5ef58876d..527be28e5c1e 100644 --- a/drivers/cpuidle/Makefile +++ b/drivers/cpuidle/Makefile @@ -7,8 +7,9 @@ obj-$(CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED) += coupled.o ################################################################################## # ARM SoC drivers +obj-$(CONFIG_ARM_BIG_LITTLE_CPUIDLE) += cpuidle-big_little.o obj-$(CONFIG_ARM_HIGHBANK_CPUIDLE) += cpuidle-calxeda.o obj-$(CONFIG_ARM_KIRKWOOD_CPUIDLE) += cpuidle-kirkwood.o obj-$(CONFIG_ARM_ZYNQ_CPUIDLE) += cpuidle-zynq.o obj-$(CONFIG_ARM_U8500_CPUIDLE) += cpuidle-ux500.o -obj-$(CONFIG_CPU_IDLE_BIG_LITTLE) += cpuidle-big_little.o +obj-$(CONFIG_ARM_AT91_CPUIDLE) += cpuidle-at91.o diff --git a/drivers/cpuidle/cpuidle-at91.c b/drivers/cpuidle/cpuidle-at91.c new file mode 100644 index 000000000000..a0774370c6bc --- /dev/null +++ b/drivers/cpuidle/cpuidle-at91.c @@ -0,0 +1,69 @@ +/* + * based on arch/arm/mach-kirkwood/cpuidle.c + * + * CPU idle support for AT91 SoC + * + * This file is licensed under the terms of the GNU General Public + * License version 2. This program is licensed "as is" without any + * warranty of any kind, whether express or implied. + * + * The cpu idle uses wait-for-interrupt and RAM self refresh in order + * to implement two idle states - + * #1 wait-for-interrupt + * #2 wait-for-interrupt and RAM self refresh + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/platform_device.h> +#include <linux/cpuidle.h> +#include <linux/io.h> +#include <linux/export.h> +#include <asm/proc-fns.h> +#include <asm/cpuidle.h> + +#define AT91_MAX_STATES 2 + +static void (*at91_standby)(void); + +/* Actual code that puts the SoC in different idle states */ +static int at91_enter_idle(struct cpuidle_device *dev, + struct cpuidle_driver *drv, + int index) +{ + at91_standby(); + return index; +} + +static struct cpuidle_driver at91_idle_driver = { + .name = "at91_idle", + .owner = THIS_MODULE, + .states[0] = ARM_CPUIDLE_WFI_STATE, + .states[1] = { + .enter = at91_enter_idle, + .exit_latency = 10, + .target_residency = 10000, + .flags = CPUIDLE_FLAG_TIME_VALID, + .name = "RAM_SR", + .desc = "WFI and DDR Self Refresh", + }, + .state_count = AT91_MAX_STATES, +}; + +/* Initialize CPU idle by registering the idle states */ +static int at91_cpuidle_probe(struct platform_device *dev) +{ + at91_standby = (void *)(dev->dev.platform_data); + + return cpuidle_register(&at91_idle_driver, NULL); +} + +static struct platform_driver at91_cpuidle_driver = { + .driver = { + .name = "cpuidle-at91", + .owner = THIS_MODULE, + }, + .probe = at91_cpuidle_probe, +}; + +module_platform_driver(at91_cpuidle_driver); diff --git a/drivers/cpuidle/cpuidle-ux500.c b/drivers/cpuidle/cpuidle-ux500.c index e0564652af35..5e35804b1a95 100644 --- a/drivers/cpuidle/cpuidle-ux500.c +++ b/drivers/cpuidle/cpuidle-ux500.c @@ -111,7 +111,7 @@ static struct cpuidle_driver ux500_idle_driver = { .state_count = 2, }; -static int __init dbx500_cpuidle_probe(struct platform_device *pdev) +static int dbx500_cpuidle_probe(struct platform_device *pdev) { /* Configure wake up reasons */ prcmu_enable_wakeups(PRCMU_WAKEUP(ARM) | PRCMU_WAKEUP(RTC) | diff --git a/drivers/cpuidle/cpuidle-zynq.c b/drivers/cpuidle/cpuidle-zynq.c index 38e03a183591..aded75928028 100644 --- a/drivers/cpuidle/cpuidle-zynq.c +++ b/drivers/cpuidle/cpuidle-zynq.c @@ -28,7 +28,7 @@ #include <linux/init.h> #include <linux/cpu_pm.h> #include <linux/cpuidle.h> -#include <linux/of.h> +#include <linux/platform_device.h> #include <asm/proc-fns.h> #include <asm/cpuidle.h> @@ -70,14 +70,19 @@ static struct cpuidle_driver zynq_idle_driver = { }; /* Initialize CPU idle by registering the idle states */ -static int __init zynq_cpuidle_init(void) +static int zynq_cpuidle_probe(struct platform_device *pdev) { - if (!of_machine_is_compatible("xlnx,zynq-7000")) - return -ENODEV; - pr_info("Xilinx Zynq CpuIdle Driver started\n"); return cpuidle_register(&zynq_idle_driver, NULL); } -device_initcall(zynq_cpuidle_init); +static struct platform_driver zynq_cpuidle_driver = { + .driver = { + .name = "cpuidle-zynq", + .owner = THIS_MODULE, + }, + .probe = zynq_cpuidle_probe, +}; + +module_platform_driver(zynq_cpuidle_driver); |