220 lines
4.8 KiB
C
220 lines
4.8 KiB
C
/*
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* Copyright (C) 2016 Freescale Semiconductor, Inc.
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* Copyright 2017 NXP
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*
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* The code contained herein is licensed under the GNU General Public
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* License. You may obtain a copy of the GNU General Public License
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* Version 2 or later at the following locations:
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*
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* http://www.opensource.org/licenses/gpl-license.html
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* http://www.gnu.org/copyleft/gpl.html
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*/
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#include <linux/arm-smccc.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/rtc.h>
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#include <soc/imx/fsl_sip.h>
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#include <soc/imx8/sc/sci.h>
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#include <soc/imx8/sc/svc/irq/api.h>
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sc_ipc_t timer_ipcHandle;
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struct imx_sc_rtc_data {
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struct rtc_device *rtc;
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spinlock_t lock;
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};
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struct imx_sc_rtc_data *data;
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static int imx_sc_rtc_alarm_sc_notify(struct notifier_block *nb,
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unsigned long event, void *group)
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{
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u32 events = 0;
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/* ignore non-rtc irq */
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if (!((event & SC_IRQ_RTC) &&
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(*(sc_irq_group_t *)group == SC_IRQ_GROUP_RTC)))
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return 0;
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rtc_update_irq(data->rtc, 1, events);
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return 0;
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}
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static struct notifier_block imx_sc_rtc_alarm_sc_notifier = {
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.notifier_call = imx_sc_rtc_alarm_sc_notify,
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};
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static int imx_sc_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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u32 time = 0;
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sc_err_t sciErr = SC_ERR_NONE;
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if (!timer_ipcHandle)
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return -ENODEV;
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sciErr = sc_timer_get_rtc_sec1970(timer_ipcHandle, &time);
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if (sciErr) {
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dev_err_once(dev, "failed to read time: %d\n", sciErr);
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return -EINVAL;
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}
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rtc_time_to_tm(time, tm);
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return 0;
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}
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static int imx_sc_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct arm_smccc_res res;
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/* pack 2 time parameters into 1 register, 16 bits for each */
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arm_smccc_smc(FSL_SIP_SRTC, FSL_SIP_SRTC_SET_TIME,
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((tm->tm_year + 1900) << 16) | (tm->tm_mon + 1),
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(tm->tm_mday << 16) | tm->tm_hour,
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(tm->tm_min << 16) | tm->tm_sec,
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0, 0, 0, &res);
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return res.a0;
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}
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static int imx_sc_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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return 0;
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}
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static int imx_sc_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
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{
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return 0;
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}
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static int imx_sc_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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sc_err_t sciErr = SC_ERR_NONE;
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struct rtc_time *alrm_tm = &alrm->time;
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if (!timer_ipcHandle)
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return -ENODEV;
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sciErr = sc_timer_set_rtc_alarm(timer_ipcHandle,
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alrm_tm->tm_year + 1900,
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alrm_tm->tm_mon + 1,
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alrm_tm->tm_mday,
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alrm_tm->tm_hour,
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alrm_tm->tm_min,
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alrm_tm->tm_sec);
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return 0;
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}
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static const struct rtc_class_ops imx_sc_rtc_ops = {
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.read_time = imx_sc_rtc_read_time,
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.set_time = imx_sc_rtc_set_time,
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.read_alarm = imx_sc_rtc_read_alarm,
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.set_alarm = imx_sc_rtc_set_alarm,
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.alarm_irq_enable = imx_sc_rtc_alarm_irq_enable,
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};
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static int imx_sc_rtc_probe(struct platform_device *pdev)
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{
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int ret = 0;
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uint32_t mu_id;
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sc_err_t sciErr;
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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platform_set_drvdata(pdev, data);
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device_init_wakeup(&pdev->dev, true);
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data->rtc = devm_rtc_device_register(&pdev->dev, pdev->name,
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&imx_sc_rtc_ops, THIS_MODULE);
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if (IS_ERR(data->rtc)) {
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ret = PTR_ERR(data->rtc);
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dev_err(&pdev->dev, "failed to register rtc: %d\n", ret);
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goto error_rtc_device_register;
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}
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sciErr = sc_ipc_getMuID(&mu_id);
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if (sciErr != SC_ERR_NONE) {
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dev_err(&pdev->dev, "can not obtain mu id: %d\n", sciErr);
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return sciErr;
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}
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sciErr = sc_ipc_open(&timer_ipcHandle, mu_id);
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if (sciErr != SC_ERR_NONE) {
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dev_err(&pdev->dev, "can not open mu channel to scu: %d\n", sciErr);
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return sciErr;
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};
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register_scu_notifier(&imx_sc_rtc_alarm_sc_notifier);
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error_rtc_device_register:
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return ret;
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}
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#ifdef CONFIG_PM_SLEEP
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static int imx_sc_rtc_suspend(struct device *dev)
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{
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return 0;
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}
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static int imx_sc_rtc_suspend_noirq(struct device *dev)
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{
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return 0;
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}
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static int imx_sc_rtc_resume(struct device *dev)
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{
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return 0;
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}
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static int imx_sc_rtc_resume_noirq(struct device *dev)
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{
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return 0;
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}
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static const struct dev_pm_ops imx_sc_rtc_pm_ops = {
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.suspend = imx_sc_rtc_suspend,
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.suspend_noirq = imx_sc_rtc_suspend_noirq,
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.resume = imx_sc_rtc_resume,
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.resume_noirq = imx_sc_rtc_resume_noirq,
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};
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#define IMX_SC_RTC_PM_OPS (&imx_sc_rtc_pm_ops)
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#else
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#define IMX8_SC_RTC_PM_OPS NULL
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#endif
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static const struct of_device_id imx_sc_dt_ids[] = {
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{ .compatible = "fsl,imx-sc-rtc", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, imx_sc_dt_ids);
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static struct platform_driver imx_sc_rtc_driver = {
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.driver = {
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.name = "imx_sc_rtc",
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.pm = IMX_SC_RTC_PM_OPS,
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.of_match_table = imx_sc_dt_ids,
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},
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.probe = imx_sc_rtc_probe,
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};
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module_platform_driver(imx_sc_rtc_driver);
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MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
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MODULE_DESCRIPTION("NXP i.MX SC RTC Driver");
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MODULE_LICENSE("GPL");
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