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84 lines
2.0 KiB
84 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (C) 2012 Freescale Semiconductor, Inc. |
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*/ |
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#include <linux/context_tracking.h> |
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#include <linux/cpuidle.h> |
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#include <linux/module.h> |
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#include <asm/cpuidle.h> |
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#include <soc/imx/cpuidle.h> |
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#include "common.h" |
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#include "cpuidle.h" |
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#include "hardware.h" |
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static int num_idle_cpus = 0; |
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static DEFINE_RAW_SPINLOCK(cpuidle_lock); |
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static int imx6q_enter_wait(struct cpuidle_device *dev, |
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struct cpuidle_driver *drv, int index) |
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{ |
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raw_spin_lock(&cpuidle_lock); |
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if (++num_idle_cpus == num_online_cpus()) |
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imx6_set_lpm(WAIT_UNCLOCKED); |
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raw_spin_unlock(&cpuidle_lock); |
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ct_idle_enter(); |
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cpu_do_idle(); |
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ct_idle_exit(); |
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raw_spin_lock(&cpuidle_lock); |
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if (num_idle_cpus-- == num_online_cpus()) |
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imx6_set_lpm(WAIT_CLOCKED); |
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raw_spin_unlock(&cpuidle_lock); |
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return index; |
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} |
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static struct cpuidle_driver imx6q_cpuidle_driver = { |
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.name = "imx6q_cpuidle", |
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.owner = THIS_MODULE, |
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.states = { |
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/* WFI */ |
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ARM_CPUIDLE_WFI_STATE, |
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/* WAIT */ |
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{ |
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.exit_latency = 50, |
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.target_residency = 75, |
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.flags = CPUIDLE_FLAG_TIMER_STOP | CPUIDLE_FLAG_RCU_IDLE, |
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.enter = imx6q_enter_wait, |
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.name = "WAIT", |
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.desc = "Clock off", |
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}, |
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}, |
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.state_count = 2, |
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.safe_state_index = 0, |
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}; |
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/* |
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* i.MX6 Q/DL has an erratum (ERR006687) that prevents the FEC from waking the |
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* CPUs when they are in wait(unclocked) state. As the hardware workaround isn't |
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* applicable to all boards, disable the deeper idle state when the workaround |
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* isn't present and the FEC is in use. |
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*/ |
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void imx6q_cpuidle_fec_irqs_used(void) |
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{ |
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cpuidle_driver_state_disabled(&imx6q_cpuidle_driver, 1, true); |
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} |
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EXPORT_SYMBOL_GPL(imx6q_cpuidle_fec_irqs_used); |
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void imx6q_cpuidle_fec_irqs_unused(void) |
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{ |
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cpuidle_driver_state_disabled(&imx6q_cpuidle_driver, 1, false); |
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} |
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EXPORT_SYMBOL_GPL(imx6q_cpuidle_fec_irqs_unused); |
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int __init imx6q_cpuidle_init(void) |
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{ |
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/* Set INT_MEM_CLK_LPM bit to get a reliable WAIT mode support */ |
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imx6_set_int_mem_clk_lpm(true); |
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return cpuidle_register(&imx6q_cpuidle_driver, NULL); |
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}
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