cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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cpuidle-zynq.c (1538B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (C) 2012-2013 Xilinx
      4 *
      5 * CPU idle support for Xilinx Zynq
      6 *
      7 * based on arch/arm/mach-at91/cpuidle.c
      8 *
      9 * The cpu idle uses wait-for-interrupt and RAM self refresh in order
     10 * to implement two idle states -
     11 * #1 wait-for-interrupt
     12 * #2 wait-for-interrupt and RAM self refresh
     13 *
     14 * Maintainer: Michal Simek <michal.simek@xilinx.com>
     15 */
     16
     17#include <linux/init.h>
     18#include <linux/cpuidle.h>
     19#include <linux/platform_device.h>
     20#include <asm/cpuidle.h>
     21
     22#define ZYNQ_MAX_STATES		2
     23
     24/* Actual code that puts the SoC in different idle states */
     25static int zynq_enter_idle(struct cpuidle_device *dev,
     26			   struct cpuidle_driver *drv, int index)
     27{
     28	/* Add code for DDR self refresh start */
     29	cpu_do_idle();
     30
     31	return index;
     32}
     33
     34static struct cpuidle_driver zynq_idle_driver = {
     35	.name = "zynq_idle",
     36	.owner = THIS_MODULE,
     37	.states = {
     38		ARM_CPUIDLE_WFI_STATE,
     39		{
     40			.enter			= zynq_enter_idle,
     41			.exit_latency		= 10,
     42			.target_residency	= 10000,
     43			.name			= "RAM_SR",
     44			.desc			= "WFI and RAM Self Refresh",
     45		},
     46	},
     47	.safe_state_index = 0,
     48	.state_count = ZYNQ_MAX_STATES,
     49};
     50
     51/* Initialize CPU idle by registering the idle states */
     52static int zynq_cpuidle_probe(struct platform_device *pdev)
     53{
     54	pr_info("Xilinx Zynq CpuIdle Driver started\n");
     55
     56	return cpuidle_register(&zynq_idle_driver, NULL);
     57}
     58
     59static struct platform_driver zynq_cpuidle_driver = {
     60	.driver = {
     61		.name = "cpuidle-zynq",
     62	},
     63	.probe = zynq_cpuidle_probe,
     64};
     65builtin_platform_driver(zynq_cpuidle_driver);