arch/arm/mach-imx/cpuidle-imx6sl.c

Source file repositories/reference/linux-study-clean/arch/arm/mach-imx/cpuidle-imx6sl.c

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-imx/cpuidle-imx6sl.c
Extension
.c
Size
1096 bytes
Lines
54
Domain
Architecture Layer
Bucket
arch/arm
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2014 Freescale Semiconductor, Inc.
 */

#include <linux/clk/imx.h>
#include <linux/cpuidle.h>
#include <linux/module.h>
#include <asm/cpuidle.h>

#include "common.h"
#include "cpuidle.h"

static __cpuidle int imx6sl_enter_wait(struct cpuidle_device *dev,
				       struct cpuidle_driver *drv, int index)
{
	imx6_set_lpm(WAIT_UNCLOCKED);
	/*
	 * Software workaround for ERR005311, see function
	 * description for details.
	 */
	imx6sl_set_wait_clk(true);
	cpu_do_idle();
	imx6sl_set_wait_clk(false);
	imx6_set_lpm(WAIT_CLOCKED);

	return index;
}

static struct cpuidle_driver imx6sl_cpuidle_driver = {
	.name = "imx6sl_cpuidle",
	.owner = THIS_MODULE,
	.states = {
		/* WFI */
		ARM_CPUIDLE_WFI_STATE,
		/* WAIT */
		{
			.exit_latency = 50,
			.target_residency = 75,
			.flags = CPUIDLE_FLAG_TIMER_STOP,
			.enter = imx6sl_enter_wait,
			.name = "WAIT",
			.desc = "Clock off",
		},
	},
	.state_count = 2,
	.safe_state_index = 0,
};

int __init imx6sl_cpuidle_init(void)
{
	return cpuidle_register(&imx6sl_cpuidle_driver, NULL);
}

Annotation

Implementation Notes