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449e056c76
The current state of the different cpuidle drivers is the different PM operations are passed via the platform_data using the platform driver paradigm. This approach allowed to split the low level PM code from the arch specific and the generic cpuidle code. Unfortunately there are complaints about this approach as, in the context of the single kernel image, we have multiple drivers loaded in memory for nothing and the platform driver is not adequate for cpuidle. This patch provides a common interface via cpuidle ops for all new cpuidle driver and a definition for the device tree. It will allow with the next patches to a have a common definition with ARM64 and share the same cpuidle driver. The code is optimized to use the __init section intensively in order to reduce the memory footprint after the driver is initialized and unify the function names with ARM64. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Kevin Hilman <khilman@linaro.org> Acked-by: Rob Herring <robherring2@gmail.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
#ifndef __ASM_ARM_CPUIDLE_H
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#define __ASM_ARM_CPUIDLE_H
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#include <asm/proc-fns.h>
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#ifdef CONFIG_CPU_IDLE
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extern int arm_cpuidle_simple_enter(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index);
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#else
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static inline int arm_cpuidle_simple_enter(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int index) { return -ENODEV; }
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#endif
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/* Common ARM WFI state */
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#define ARM_CPUIDLE_WFI_STATE_PWR(p) {\
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.enter = arm_cpuidle_simple_enter,\
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.exit_latency = 1,\
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.target_residency = 1,\
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.power_usage = p,\
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.name = "WFI",\
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.desc = "ARM WFI",\
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}
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/*
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* in case power_specified == 1, give a default WFI power value needed
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* by some governors
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*/
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#define ARM_CPUIDLE_WFI_STATE ARM_CPUIDLE_WFI_STATE_PWR(UINT_MAX)
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struct device_node;
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struct cpuidle_ops {
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int (*suspend)(int cpu, unsigned long arg);
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int (*init)(struct device_node *, int cpu);
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};
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struct of_cpuidle_method {
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const char *method;
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struct cpuidle_ops *ops;
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};
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#define CPUIDLE_METHOD_OF_DECLARE(name, _method, _ops) \
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static const struct of_cpuidle_method __cpuidle_method_of_table_##name \
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__used __section(__cpuidle_method_of_table) \
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= { .method = _method, .ops = _ops }
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extern int arm_cpuidle_suspend(int index);
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extern int arm_cpuidle_init(int cpu);
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#endif
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