1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright (C) 2012 Freescale Semiconductor, Inc.
 4 */
 5
 6#include <linux/context_tracking.h>
 7#include <linux/cpuidle.h>
 8#include <linux/module.h>
 9#include <asm/cpuidle.h>
10
11#include <soc/imx/cpuidle.h>
12
13#include "common.h"
14#include "cpuidle.h"
15#include "hardware.h"
16
17static int num_idle_cpus = 0;
18static DEFINE_RAW_SPINLOCK(cpuidle_lock);
19
20static __cpuidle int imx6q_enter_wait(struct cpuidle_device *dev,
21				      struct cpuidle_driver *drv, int index)
22{
23	raw_spin_lock(&cpuidle_lock);
24	if (++num_idle_cpus == num_online_cpus())
25		imx6_set_lpm(WAIT_UNCLOCKED);
26	raw_spin_unlock(&cpuidle_lock);
27
28	ct_cpuidle_enter();
29	cpu_do_idle();
30	ct_cpuidle_exit();
31
32	raw_spin_lock(&cpuidle_lock);
33	if (num_idle_cpus-- == num_online_cpus())
34		imx6_set_lpm(WAIT_CLOCKED);
35	raw_spin_unlock(&cpuidle_lock);
36
37	return index;
38}
39
40static struct cpuidle_driver imx6q_cpuidle_driver = {
41	.name = "imx6q_cpuidle",
42	.owner = THIS_MODULE,
43	.states = {
44		/* WFI */
45		ARM_CPUIDLE_WFI_STATE,
46		/* WAIT */
47		{
48			.exit_latency = 50,
49			.target_residency = 75,
50			.flags = CPUIDLE_FLAG_TIMER_STOP | CPUIDLE_FLAG_RCU_IDLE,
51			.enter = imx6q_enter_wait,
52			.name = "WAIT",
53			.desc = "Clock off",
54		},
55	},
56	.state_count = 2,
57	.safe_state_index = 0,
58};
59
60/*
61 * i.MX6 Q/DL has an erratum (ERR006687) that prevents the FEC from waking the
62 * CPUs when they are in wait(unclocked) state. As the hardware workaround isn't
63 * applicable to all boards, disable the deeper idle state when the workaround
64 * isn't present and the FEC is in use.
65 */
66void imx6q_cpuidle_fec_irqs_used(void)
67{
68	cpuidle_driver_state_disabled(&imx6q_cpuidle_driver, 1, true);
69}
70EXPORT_SYMBOL_GPL(imx6q_cpuidle_fec_irqs_used);
71
72void imx6q_cpuidle_fec_irqs_unused(void)
73{
74	cpuidle_driver_state_disabled(&imx6q_cpuidle_driver, 1, false);
75}
76EXPORT_SYMBOL_GPL(imx6q_cpuidle_fec_irqs_unused);
77
78int __init imx6q_cpuidle_init(void)
79{
80	/* Set INT_MEM_CLK_LPM bit to get a reliable WAIT mode support */
81	imx6_set_int_mem_clk_lpm(true);
82
83	return cpuidle_register(&imx6q_cpuidle_driver, NULL);
84}

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright (C) 2012 Freescale Semiconductor, Inc.
 4 */
 5
 6#include <linux/context_tracking.h>
 7#include <linux/cpuidle.h>
 8#include <linux/module.h>
 9#include <asm/cpuidle.h>
10
11#include <soc/imx/cpuidle.h>
12
13#include "common.h"
14#include "cpuidle.h"
15#include "hardware.h"
16
17static int num_idle_cpus = 0;
18static DEFINE_RAW_SPINLOCK(cpuidle_lock);
19
20static __cpuidle int imx6q_enter_wait(struct cpuidle_device *dev,
21				      struct cpuidle_driver *drv, int index)
22{
23	raw_spin_lock(&cpuidle_lock);
24	if (++num_idle_cpus == num_online_cpus())
25		imx6_set_lpm(WAIT_UNCLOCKED);
26	raw_spin_unlock(&cpuidle_lock);
27
28	ct_cpuidle_enter();
29	cpu_do_idle();
30	ct_cpuidle_exit();
31
32	raw_spin_lock(&cpuidle_lock);
33	if (num_idle_cpus-- == num_online_cpus())
34		imx6_set_lpm(WAIT_CLOCKED);
35	raw_spin_unlock(&cpuidle_lock);
36
37	return index;
38}
39
40static struct cpuidle_driver imx6q_cpuidle_driver = {
41	.name = "imx6q_cpuidle",
42	.owner = THIS_MODULE,
43	.states = {
44		/* WFI */
45		ARM_CPUIDLE_WFI_STATE,
46		/* WAIT */
47		{
48			.exit_latency = 50,
49			.target_residency = 75,
50			.flags = CPUIDLE_FLAG_TIMER_STOP | CPUIDLE_FLAG_RCU_IDLE,
51			.enter = imx6q_enter_wait,
52			.name = "WAIT",
53			.desc = "Clock off",
54		},
55	},
56	.state_count = 2,
57	.safe_state_index = 0,
58};
59
60/*
61 * i.MX6 Q/DL has an erratum (ERR006687) that prevents the FEC from waking the
62 * CPUs when they are in wait(unclocked) state. As the hardware workaround isn't
63 * applicable to all boards, disable the deeper idle state when the workaround
64 * isn't present and the FEC is in use.
65 */
66void imx6q_cpuidle_fec_irqs_used(void)
67{
68	cpuidle_driver_state_disabled(&imx6q_cpuidle_driver, 1, true);
69}
70EXPORT_SYMBOL_GPL(imx6q_cpuidle_fec_irqs_used);
71
72void imx6q_cpuidle_fec_irqs_unused(void)
73{
74	cpuidle_driver_state_disabled(&imx6q_cpuidle_driver, 1, false);
75}
76EXPORT_SYMBOL_GPL(imx6q_cpuidle_fec_irqs_unused);
77
78int __init imx6q_cpuidle_init(void)
79{
80	/* Set INT_MEM_CLK_LPM bit to get a reliable WAIT mode support */
81	imx6_set_int_mem_clk_lpm(true);
82
83	return cpuidle_register(&imx6q_cpuidle_driver, NULL);
84}