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