https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: f2906aa863381afb0015a9eb7fefad885d4e5a56 authored by Linus Torvalds on 06 June 2022, 00:18:54 UTC
Linux 5.19-rc1
Linux 5.19-rc1
Tip revision: f2906aa
cpuidle-zynq.c
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2012-2013 Xilinx
*
* CPU idle support for Xilinx Zynq
*
* based on arch/arm/mach-at91/cpuidle.c
*
* 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
*
* Maintainer: Michal Simek <michal.simek@xilinx.com>
*/
#include <linux/init.h>
#include <linux/cpuidle.h>
#include <linux/platform_device.h>
#include <asm/cpuidle.h>
#define ZYNQ_MAX_STATES 2
/* Actual code that puts the SoC in different idle states */
static int zynq_enter_idle(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int index)
{
/* Add code for DDR self refresh start */
cpu_do_idle();
return index;
}
static struct cpuidle_driver zynq_idle_driver = {
.name = "zynq_idle",
.owner = THIS_MODULE,
.states = {
ARM_CPUIDLE_WFI_STATE,
{
.enter = zynq_enter_idle,
.exit_latency = 10,
.target_residency = 10000,
.name = "RAM_SR",
.desc = "WFI and RAM Self Refresh",
},
},
.safe_state_index = 0,
.state_count = ZYNQ_MAX_STATES,
};
/* Initialize CPU idle by registering the idle states */
static int zynq_cpuidle_probe(struct platform_device *pdev)
{
pr_info("Xilinx Zynq CpuIdle Driver started\n");
return cpuidle_register(&zynq_idle_driver, NULL);
}
static struct platform_driver zynq_cpuidle_driver = {
.driver = {
.name = "cpuidle-zynq",
},
.probe = zynq_cpuidle_probe,
};
builtin_platform_driver(zynq_cpuidle_driver);