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![Stephan Gerhold](/assets/img/avatar_default.png)
qcom_scm_set_cold/warm_boot_addr() currently take a cpumask parameter, but it's not very useful because at the end we always set the same entry address for all CPUs. This also allows speeding up probe of cpuidle-qcom-spm a bit because only one SCM call needs to be made to the TrustZone firmware, instead of one per CPU. The main reason for this change is that it allows implementing the "multi-cluster" variant of the set_boot_addr() call more easily without having to rely on functions that break in certain build configurations or that are not exported to modules. Signed-off-by: Stephan Gerhold <stephan@gerhold.net> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org> Link: https://lore.kernel.org/r/20211201130505.257379-4-stephan@gerhold.net
196 lines
4.5 KiB
C
196 lines
4.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2011-2014, The Linux Foundation. All rights reserved.
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* Copyright (c) 2014,2015, Linaro Ltd.
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*
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* SAW power controller driver
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/cpuidle.h>
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#include <linux/cpu_pm.h>
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#include <linux/qcom_scm.h>
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#include <soc/qcom/spm.h>
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#include <asm/proc-fns.h>
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#include <asm/suspend.h>
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#include "dt_idle_states.h"
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struct cpuidle_qcom_spm_data {
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struct cpuidle_driver cpuidle_driver;
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struct spm_driver_data *spm;
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};
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static int qcom_pm_collapse(unsigned long int unused)
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{
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qcom_scm_cpu_power_down(QCOM_SCM_CPU_PWR_DOWN_L2_ON);
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/*
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* Returns here only if there was a pending interrupt and we did not
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* power down as a result.
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*/
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return -1;
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}
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static int qcom_cpu_spc(struct spm_driver_data *drv)
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{
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int ret;
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spm_set_low_power_mode(drv, PM_SLEEP_MODE_SPC);
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ret = cpu_suspend(0, qcom_pm_collapse);
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/*
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* ARM common code executes WFI without calling into our driver and
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* if the SPM mode is not reset, then we may accidently power down the
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* cpu when we intended only to gate the cpu clock.
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* Ensure the state is set to standby before returning.
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*/
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spm_set_low_power_mode(drv, PM_SLEEP_MODE_STBY);
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return ret;
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}
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static int spm_enter_idle_state(struct cpuidle_device *dev,
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struct cpuidle_driver *drv, int idx)
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{
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struct cpuidle_qcom_spm_data *data = container_of(drv, struct cpuidle_qcom_spm_data,
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cpuidle_driver);
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return CPU_PM_CPU_IDLE_ENTER_PARAM(qcom_cpu_spc, idx, data->spm);
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}
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static struct cpuidle_driver qcom_spm_idle_driver = {
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.name = "qcom_spm",
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.owner = THIS_MODULE,
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.states[0] = {
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.enter = spm_enter_idle_state,
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.exit_latency = 1,
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.target_residency = 1,
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.power_usage = UINT_MAX,
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.name = "WFI",
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.desc = "ARM WFI",
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}
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};
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static const struct of_device_id qcom_idle_state_match[] = {
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{ .compatible = "qcom,idle-state-spc", .data = spm_enter_idle_state },
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{ },
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};
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static int spm_cpuidle_register(struct device *cpuidle_dev, int cpu)
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{
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struct platform_device *pdev = NULL;
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struct device_node *cpu_node, *saw_node;
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struct cpuidle_qcom_spm_data *data = NULL;
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int ret;
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cpu_node = of_cpu_device_node_get(cpu);
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if (!cpu_node)
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return -ENODEV;
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saw_node = of_parse_phandle(cpu_node, "qcom,saw", 0);
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if (!saw_node)
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return -ENODEV;
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pdev = of_find_device_by_node(saw_node);
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of_node_put(saw_node);
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of_node_put(cpu_node);
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if (!pdev)
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return -ENODEV;
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data = devm_kzalloc(cpuidle_dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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data->spm = dev_get_drvdata(&pdev->dev);
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if (!data->spm)
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return -EINVAL;
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data->cpuidle_driver = qcom_spm_idle_driver;
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data->cpuidle_driver.cpumask = (struct cpumask *)cpumask_of(cpu);
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ret = dt_init_idle_driver(&data->cpuidle_driver,
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qcom_idle_state_match, 1);
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if (ret <= 0)
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return ret ? : -ENODEV;
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return cpuidle_register(&data->cpuidle_driver, NULL);
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}
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static int spm_cpuidle_drv_probe(struct platform_device *pdev)
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{
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int cpu, ret;
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if (!qcom_scm_is_available())
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return -EPROBE_DEFER;
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ret = qcom_scm_set_warm_boot_addr(cpu_resume_arm);
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if (ret)
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return dev_err_probe(&pdev->dev, ret, "set warm boot addr failed");
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for_each_possible_cpu(cpu) {
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ret = spm_cpuidle_register(&pdev->dev, cpu);
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if (ret && ret != -ENODEV) {
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dev_err(&pdev->dev,
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"Cannot register for CPU%d: %d\n", cpu, ret);
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}
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}
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return 0;
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}
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static struct platform_driver spm_cpuidle_driver = {
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.probe = spm_cpuidle_drv_probe,
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.driver = {
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.name = "qcom-spm-cpuidle",
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.suppress_bind_attrs = true,
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},
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};
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static bool __init qcom_spm_find_any_cpu(void)
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{
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struct device_node *cpu_node, *saw_node;
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for_each_of_cpu_node(cpu_node) {
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saw_node = of_parse_phandle(cpu_node, "qcom,saw", 0);
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if (of_device_is_available(saw_node)) {
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of_node_put(saw_node);
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of_node_put(cpu_node);
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return true;
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}
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of_node_put(saw_node);
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}
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return false;
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}
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static int __init qcom_spm_cpuidle_init(void)
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{
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struct platform_device *pdev;
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int ret;
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ret = platform_driver_register(&spm_cpuidle_driver);
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if (ret)
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return ret;
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/* Make sure there is actually any CPU managed by the SPM */
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if (!qcom_spm_find_any_cpu())
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return 0;
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pdev = platform_device_register_simple("qcom-spm-cpuidle",
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-1, NULL, 0);
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if (IS_ERR(pdev)) {
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platform_driver_unregister(&spm_cpuidle_driver);
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return PTR_ERR(pdev);
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}
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return 0;
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}
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device_initcall(qcom_spm_cpuidle_init);
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