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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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0af4817b80
This patch adds a shared SH-Mobile ARM specific CPUIdle implementation supporting WFI only at this point. It serves as a common point for late registration of the arch-specific CPUIdle code, and supports adding extra sleep modes using the callback shmobile_cpuidle_setup() together with shmobile_cpuidle_modes[]. Signed-off-by: Magnus Damm <damm@opensource.se> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
93 lines
2.1 KiB
C
93 lines
2.1 KiB
C
/*
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* CPUIdle support code for SH-Mobile ARM
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*
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* Copyright (C) 2011 Magnus Damm
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/pm.h>
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#include <linux/cpuidle.h>
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#include <linux/suspend.h>
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#include <linux/module.h>
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#include <linux/err.h>
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#include <asm/system.h>
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#include <asm/io.h>
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static void shmobile_enter_wfi(void)
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{
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cpu_do_idle();
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}
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void (*shmobile_cpuidle_modes[CPUIDLE_STATE_MAX])(void) = {
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shmobile_enter_wfi, /* regular sleep mode */
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};
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static int shmobile_cpuidle_enter(struct cpuidle_device *dev,
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struct cpuidle_state *state)
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{
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ktime_t before, after;
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int requested_state = state - &dev->states[0];
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dev->last_state = &dev->states[requested_state];
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before = ktime_get();
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local_irq_disable();
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local_fiq_disable();
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shmobile_cpuidle_modes[requested_state]();
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local_irq_enable();
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local_fiq_enable();
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after = ktime_get();
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return ktime_to_ns(ktime_sub(after, before)) >> 10;
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}
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static struct cpuidle_device shmobile_cpuidle_dev;
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static struct cpuidle_driver shmobile_cpuidle_driver = {
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.name = "shmobile_cpuidle",
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.owner = THIS_MODULE,
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};
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void (*shmobile_cpuidle_setup)(struct cpuidle_device *dev);
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static int shmobile_cpuidle_init(void)
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{
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struct cpuidle_device *dev = &shmobile_cpuidle_dev;
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struct cpuidle_state *state;
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int i;
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cpuidle_register_driver(&shmobile_cpuidle_driver);
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for (i = 0; i < CPUIDLE_STATE_MAX; i++) {
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dev->states[i].name[0] = '\0';
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dev->states[i].desc[0] = '\0';
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dev->states[i].enter = shmobile_cpuidle_enter;
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}
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i = CPUIDLE_DRIVER_STATE_START;
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state = &dev->states[i++];
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snprintf(state->name, CPUIDLE_NAME_LEN, "C1");
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strncpy(state->desc, "WFI", CPUIDLE_DESC_LEN);
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state->exit_latency = 1;
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state->target_residency = 1 * 2;
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state->power_usage = 3;
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state->flags = 0;
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state->flags |= CPUIDLE_FLAG_TIME_VALID;
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dev->safe_state = state;
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dev->state_count = i;
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if (shmobile_cpuidle_setup)
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shmobile_cpuidle_setup(dev);
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cpuidle_register_device(dev);
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return 0;
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}
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late_initcall(shmobile_cpuidle_init);
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