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-at91.c (1651B)

      1/*
      2 * based on arch/arm/mach-kirkwood/cpuidle.c
      3 *
      4 * CPU idle support for AT91 SoC
      5 *
      6 * This file is licensed under the terms of the GNU General Public
      7 * License version 2.  This program is licensed "as is" without any
      8 * warranty of any kind, whether express or implied.
      9 *
     10 * The cpu idle uses wait-for-interrupt and RAM self refresh in order
     11 * to implement two idle states -
     12 * #1 wait-for-interrupt
     13 * #2 wait-for-interrupt and RAM self refresh
     14 */
     15
     16#include <linux/kernel.h>
     17#include <linux/init.h>
     18#include <linux/platform_device.h>
     19#include <linux/cpuidle.h>
     20#include <linux/io.h>
     21#include <linux/export.h>
     22#include <asm/cpuidle.h>
     23
     24#define AT91_MAX_STATES	2
     25
     26static void (*at91_standby)(void);
     27
     28/* Actual code that puts the SoC in different idle states */
     29static int at91_enter_idle(struct cpuidle_device *dev,
     30			struct cpuidle_driver *drv,
     31			       int index)
     32{
     33	at91_standby();
     34	return index;
     35}
     36
     37static struct cpuidle_driver at91_idle_driver = {
     38	.name			= "at91_idle",
     39	.owner			= THIS_MODULE,
     40	.states[0]		= ARM_CPUIDLE_WFI_STATE,
     41	.states[1]		= {
     42		.enter			= at91_enter_idle,
     43		.exit_latency		= 10,
     44		.target_residency	= 10000,
     45		.name			= "RAM_SR",
     46		.desc			= "WFI and DDR Self Refresh",
     47	},
     48	.state_count = AT91_MAX_STATES,
     49};
     50
     51/* Initialize CPU idle by registering the idle states */
     52static int at91_cpuidle_probe(struct platform_device *dev)
     53{
     54	at91_standby = (void *)(dev->dev.platform_data);
     55	
     56	return cpuidle_register(&at91_idle_driver, NULL);
     57}
     58
     59static struct platform_driver at91_cpuidle_driver = {
     60	.driver = {
     61		.name = "cpuidle-at91",
     62	},
     63	.probe = at91_cpuidle_probe,
     64};
     65builtin_platform_driver(at91_cpuidle_driver);