1/*
  2 * arch/arm/mach-tegra/cpuidle.c
  3 *
  4 * CPU idle driver for Tegra CPUs
  5 *
  6 * Copyright (c) 2010-2012, NVIDIA Corporation.
  7 * Copyright (c) 2011 Google, Inc.
  8 * Author: Colin Cross <ccross@android.com>
  9 *         Gary King <gking@nvidia.com>
 10 *
 11 * Rework for 3.3 by Peter De Schrijver <pdeschrijver@nvidia.com>
 12 *
 13 * This program is free software; you can redistribute it and/or modify
 14 * it under the terms of the GNU General Public License as published by
 15 * the Free Software Foundation; either version 2 of the License, or
 16 * (at your option) any later version.
 17 *
 18 * This program is distributed in the hope that it will be useful, but WITHOUT
 19 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 20 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 21 * more details.
 22 */
 23
 24#include <linux/kernel.h>
 25#include <linux/module.h>
 26#include <linux/cpu.h>
 27#include <linux/cpuidle.h>
 28#include <linux/hrtimer.h>
 29
 30#include <mach/iomap.h>
 31
 32extern void tegra_cpu_wfi(void);
 33
 34static int tegra_idle_enter_lp3(struct cpuidle_device *dev,
 35				struct cpuidle_driver *drv, int index);
 36
 37struct cpuidle_driver tegra_idle_driver = {
 38	.name = "tegra_idle",
 39	.owner = THIS_MODULE,
 40	.state_count = 1,
 41	.states = {
 42		[0] = {
 43			.enter			= tegra_idle_enter_lp3,
 44			.exit_latency		= 10,
 45			.target_residency	= 10,
 46			.power_usage		= 600,
 47			.flags			= CPUIDLE_FLAG_TIME_VALID,
 48			.name			= "LP3",
 49			.desc			= "CPU flow-controlled",
 50		},
 51	},
 52};
 53
 54static DEFINE_PER_CPU(struct cpuidle_device, tegra_idle_device);
 55
 56static int tegra_idle_enter_lp3(struct cpuidle_device *dev,
 57	struct cpuidle_driver *drv, int index)
 58{
 59	ktime_t enter, exit;
 60	s64 us;
 61
 62	local_irq_disable();
 63	local_fiq_disable();
 64
 65	enter = ktime_get();
 66
 67	tegra_cpu_wfi();
 68
 69	exit = ktime_sub(ktime_get(), enter);
 70	us = ktime_to_us(exit);
 71
 72	local_fiq_enable();
 73	local_irq_enable();
 74
 75	dev->last_residency = us;
 76
 77	return index;
 78}
 79
 80static int __init tegra_cpuidle_init(void)
 81{
 82	int ret;
 83	unsigned int cpu;
 84	struct cpuidle_device *dev;
 85	struct cpuidle_driver *drv = &tegra_idle_driver;
 86
 87	ret = cpuidle_register_driver(&tegra_idle_driver);
 88	if (ret) {
 89		pr_err("CPUidle driver registration failed\n");
 90		return ret;
 91	}
 92
 93	for_each_possible_cpu(cpu) {
 94		dev = &per_cpu(tegra_idle_device, cpu);
 95		dev->cpu = cpu;
 96
 97		dev->state_count = drv->state_count;
 98		ret = cpuidle_register_device(dev);
 99		if (ret) {
100			pr_err("CPU%u: CPUidle device registration failed\n",
101				cpu);
102			return ret;
103		}
104	}
105	return 0;
106}
107device_initcall(tegra_cpuidle_init);

 1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * arch/arm/mach-tegra/cpuidle.c
 4 *
 5 * CPU idle driver for Tegra CPUs
 6 *
 7 * Copyright (c) 2010-2012, NVIDIA Corporation.
 8 * Copyright (c) 2011 Google, Inc.
 9 * Author: Colin Cross <ccross@android.com>
10 *         Gary King <gking@nvidia.com>
11 *
12 * Rework for 3.3 by Peter De Schrijver <pdeschrijver@nvidia.com>
 
 
 
 
 
 
 
 
 
 
13 */
14
15#include <linux/kernel.h>
16#include <linux/module.h>
 
 
 
 
 
 
 
 
 
 
17
18#include <soc/tegra/fuse.h>
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
19
20#include "cpuidle.h"
21
22void __init tegra_cpuidle_init(void)
 
23{
24	switch (tegra_get_chip_id()) {
25	case TEGRA20:
26		if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC))
27			tegra20_cpuidle_init();
28		break;
29	case TEGRA30:
30		if (IS_ENABLED(CONFIG_ARCH_TEGRA_3x_SOC))
31			tegra30_cpuidle_init();
32		break;
33	case TEGRA114:
34	case TEGRA124:
35		if (IS_ENABLED(CONFIG_ARCH_TEGRA_114_SOC) ||
36		    IS_ENABLED(CONFIG_ARCH_TEGRA_124_SOC))
37			tegra114_cpuidle_init();
38		break;
39	}
 
 
 
40}
41
42void tegra_cpuidle_pcie_irqs_in_use(void)
43{
44	switch (tegra_get_chip_id()) {
45	case TEGRA20:
46		if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC))
47			tegra20_cpuidle_pcie_irqs_in_use();
48		break;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
49	}
 
50}