691718eeb0
When all the CPUs in the Apps processor subsystem are powered off, the system may also reduce its bandwidth and shared resource requirements. The resource requests are sent through the SMD from APSS subsystem. The sleep requests also need to be written to the rpm to save power. This driver handles the last few steps when entering system sleep. When notified, the next wakeup timer value is written to the MPM to be setup in the always-on domain timer. Change-Id: Iab9e38d602d4f84e506471ec0864d2c6fb550b42 Signed-off-by: Raghavendra Kakarla <rkakarla@codeaurora.org>
85 lines
1.8 KiB
C
85 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2020, The Linux Foundation. All rights reserved.
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*/
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/tick.h>
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#include <clocksource/arm_arch_timer.h>
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#include <linux/ktime.h>
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#include <asm/arch_timer.h>
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#include <soc/qcom/rpm-notifier.h>
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#include <soc/qcom/lpm_levels.h>
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#include <soc/qcom/mpm.h>
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static void system_sleep_exit(bool success)
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{
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msm_rpm_exit_sleep();
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}
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static int system_sleep_update_wakeup(bool from_idle)
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{
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uint32_t lo = ~0U, hi = ~0U;
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u64 wakeup;
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/* Read the hardware to get the most accurate value */
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arch_timer_mem_get_cval(&lo, &hi);
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wakeup = lo;
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wakeup |= ((uint64_t)(hi) << 32);
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msm_mpm_timer_write((uint32_t *)&wakeup);
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return 0;
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}
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static int system_sleep_enter(struct cpumask *mask)
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{
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int ret = 0;
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ret = msm_rpm_enter_sleep(0, mask);
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if (ret)
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return ret;
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msm_mpm_enter_sleep(mask);
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return ret;
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}
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static bool system_sleep_allowed(void)
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{
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return !msm_rpm_waiting_for_ack();
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}
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static struct system_pm_ops pm_ops = {
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.enter = system_sleep_enter,
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.exit = system_sleep_exit,
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.update_wakeup = system_sleep_update_wakeup,
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.sleep_allowed = system_sleep_allowed,
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};
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static int sys_pm_rpm_probe(struct platform_device *pdev)
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{
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return register_system_pm_ops(&pm_ops);
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}
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static const struct of_device_id sys_pm_drv_match[] = {
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{ .compatible = "qcom,system-pm-rpm", },
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{ }
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};
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static struct platform_driver sys_pm_rpm_driver = {
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.probe = sys_pm_rpm_probe,
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.driver = {
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.name = KBUILD_MODNAME,
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.suppress_bind_attrs = true,
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.of_match_table = sys_pm_drv_match,
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},
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};
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module_platform_driver(sys_pm_rpm_driver);
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MODULE_DESCRIPTION("Qualcomm Technologies, Inc. (QTI) SYSTEM PM RPM Driver");
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MODULE_LICENSE("GPL v2");
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