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/*
* 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/init.h>
#include <linux/io.h>
#include <linux/imx_rpmsg.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/pm_qos.h>
#include <linux/rpmsg.h>
#include <linux/rtc.h>
#define RPMSG_TIMEOUT 1000
#define RTC_RPMSG_SEND 0x0
#define RTC_RPMSG_RECEIVE 0x1
#define RTC_RPMSG_NOTIFY 0x2
enum rtc_rpmsg_cmd {
RTC_RPMSG_SET_TIME,
RTC_RPMSG_GET_TIME,
RTC_RPMSG_SET_ALARM,
RTC_RPMSG_GET_ALARM,
RTC_RPMSG_ENABLE_ALARM,
};
struct rtc_rpmsg_data {
struct imx_rpmsg_head header;
u8 reserved0;
union {
u8 reserved1;
u8 ret;
};
union {
u32 reserved2;
u32 sec;
};
union {
u8 enable;
u8 reserved3;
};
union {
u8 pending;
u8 reserved4;
};
} __attribute__ ((packed));
struct rtc_rpmsg_info {
struct rpmsg_device *rpdev;
struct device *dev;
struct rtc_rpmsg_data *msg;
struct pm_qos_request pm_qos_req;
struct completion cmd_complete;
struct mutex lock;
};
static struct rtc_rpmsg_info rtc_rpmsg;
struct imx_rpmsg_rtc_data {
struct rtc_device *rtc;
spinlock_t lock;
};
struct imx_rpmsg_rtc_data *data;
static int rtc_send_message(struct rtc_rpmsg_data *msg,
struct rtc_rpmsg_info *info, bool ack)
{
int err;
if (!info->rpdev) {
dev_dbg(info->dev,
"rpmsg channel not ready, m4 image ready?\n");
return -EINVAL;
}
mutex_lock(&info->lock);
pm_qos_add_request(&info->pm_qos_req,
PM_QOS_CPU_DMA_LATENCY, 0);
reinit_completion(&info->cmd_complete);
err = rpmsg_send(info->rpdev->ept, (void *)msg,
sizeof(struct rtc_rpmsg_data));
if (err) {
dev_err(&info->rpdev->dev, "rpmsg_send failed: %d\n", err);
goto err_out;
}
if (ack) {
err = wait_for_completion_timeout(&info->cmd_complete,
msecs_to_jiffies(RPMSG_TIMEOUT));
if (!err) {
dev_err(&info->rpdev->dev, "rpmsg_send timeout!\n");
err = -ETIMEDOUT;
goto err_out;
}
if (info->msg->ret != 0) {
dev_err(&info->rpdev->dev, "rpmsg not ack %d!\n",
info->msg->ret);
err = -EINVAL;
goto err_out;
}
err = 0;
}
err_out:
pm_qos_remove_request(&info->pm_qos_req);
mutex_unlock(&info->lock);
return err;
}
static int imx_rpmsg_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct rtc_rpmsg_data msg;
int ret;
msg.header.cate = IMX_RPMSG_RTC;
msg.header.major = IMX_RMPSG_MAJOR;
msg.header.minor = IMX_RMPSG_MINOR;
msg.header.type = RTC_RPMSG_SEND;
msg.header.cmd = RTC_RPMSG_GET_TIME;
ret = rtc_send_message(&msg, &rtc_rpmsg, true);
if (ret)
return ret;
rtc_time_to_tm(rtc_rpmsg.msg->sec, tm);
return 0;
}
static int imx_rpmsg_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct rtc_rpmsg_data msg;
unsigned long time;
int ret;
rtc_tm_to_time(tm, &time);
msg.header.cate = IMX_RPMSG_RTC;
msg.header.major = IMX_RMPSG_MAJOR;
msg.header.minor = IMX_RMPSG_MINOR;
msg.header.type = RTC_RPMSG_SEND;
msg.header.cmd = RTC_RPMSG_SET_TIME;
msg.sec = time;
ret = rtc_send_message(&msg, &rtc_rpmsg, true);
if (ret)
return ret;
return rtc_rpmsg.msg->ret;
}
static int imx_rpmsg_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct rtc_rpmsg_data msg;
int ret;
msg.header.cate = IMX_RPMSG_RTC;
msg.header.major = IMX_RMPSG_MAJOR;
msg.header.minor = IMX_RMPSG_MINOR;
msg.header.type = RTC_RPMSG_SEND;
msg.header.cmd = RTC_RPMSG_GET_ALARM;
ret = rtc_send_message(&msg, &rtc_rpmsg, true);
if (ret)
return ret;
rtc_time_to_tm(rtc_rpmsg.msg->sec, &alrm->time);
alrm->pending = rtc_rpmsg.msg->pending;
return rtc_rpmsg.msg->ret;
}
static int imx_rpmsg_rtc_alarm_irq_enable(struct device *dev,
unsigned int enable)
{
struct rtc_rpmsg_data msg;
int ret;
msg.header.cate = IMX_RPMSG_RTC;
msg.header.major = IMX_RMPSG_MAJOR;
msg.header.minor = IMX_RMPSG_MINOR;
msg.header.type = RTC_RPMSG_SEND;
msg.header.cmd = RTC_RPMSG_ENABLE_ALARM;
ret = rtc_send_message(&msg, &rtc_rpmsg, true);
if (ret)
return ret;
return rtc_rpmsg.msg->ret;
}
static int imx_rpmsg_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
{
struct rtc_rpmsg_data msg;
unsigned long time;
int ret;
rtc_tm_to_time(&alrm->time, &time);
msg.header.cate = IMX_RPMSG_RTC;
msg.header.major = IMX_RMPSG_MAJOR;
msg.header.minor = IMX_RMPSG_MINOR;
msg.header.type = RTC_RPMSG_SEND;
msg.header.cmd = RTC_RPMSG_SET_ALARM;
msg.sec = time;
msg.enable = alrm->enabled;
ret = rtc_send_message(&msg, &rtc_rpmsg, true);
if (ret)
return ret;
return rtc_rpmsg.msg->ret;
}
static int imx_rpmsg_rtc_alarm_irq_update(void)
{
rtc_update_irq(data->rtc, 1, RTC_IRQF);
return 0;
}
static const struct rtc_class_ops imx_rpmsg_rtc_ops = {
.read_time = imx_rpmsg_rtc_read_time,
.set_time = imx_rpmsg_rtc_set_time,
.read_alarm = imx_rpmsg_rtc_read_alarm,
.set_alarm = imx_rpmsg_rtc_set_alarm,
.alarm_irq_enable = imx_rpmsg_rtc_alarm_irq_enable,
};
static struct rpmsg_device_id rtc_rpmsg_id_table[] = {
{ .name = "rpmsg-rtc-channel" },
{ },
};
static int rtc_rpmsg_probe(struct rpmsg_device *rpdev)
{
int ret = 0;
dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
rpdev->src, rpdev->dst);
rtc_rpmsg.rpdev = rpdev;
mutex_init(&rtc_rpmsg.lock);
init_completion(&rtc_rpmsg.cmd_complete);
return ret;
}
static int rtc_rpmsg_cb(struct rpmsg_device *rpdev, void *data, int len,
void *priv, u32 src)
{
struct rtc_rpmsg_data *msg = (struct rtc_rpmsg_data *)data;
if (msg->header.type == RTC_RPMSG_RECEIVE) {
rtc_rpmsg.msg = msg;
complete(&rtc_rpmsg.cmd_complete);
return 0;
} else if (msg->header.type == RTC_RPMSG_NOTIFY) {
rtc_rpmsg.msg = msg;
imx_rpmsg_rtc_alarm_irq_update();
} else
dev_err(&rtc_rpmsg.rpdev->dev, "wrong command type!\n");
return 0;
}
static void rtc_rpmsg_remove(struct rpmsg_device *rpdev)
{
dev_info(&rpdev->dev, "rtc rpmsg driver is removed\n");
}
static struct rpmsg_driver rtc_rpmsg_driver = {
.drv.name = "rtc_rpmsg",
.drv.owner = THIS_MODULE,
.id_table = rtc_rpmsg_id_table,
.probe = rtc_rpmsg_probe,
.callback = rtc_rpmsg_cb,
.remove = rtc_rpmsg_remove,
};
static int imx_rpmsg_rtc_probe(struct platform_device *pdev)
{
int ret = 0;
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_rpmsg_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;
}
platform_set_drvdata(pdev, &rtc_rpmsg);
ret = register_rpmsg_driver(&rtc_rpmsg_driver);
if (ret)
dev_err(&pdev->dev, "failed to register rpmsg for rtc: %d\n",
ret);
error_rtc_device_register:
return ret;
}
#ifdef CONFIG_PM_SLEEP
static int imx_rpmsg_rtc_suspend(struct device *dev)
{
return 0;
}
static int imx_rpmsg_rtc_suspend_noirq(struct device *dev)
{
return 0;
}
static int imx_rpmsg_rtc_resume(struct device *dev)
{
return 0;
}
static int imx_rpmsg_rtc_resume_noirq(struct device *dev)
{
return 0;
}
static const struct dev_pm_ops imx_rpmsg_rtc_pm_ops = {
.suspend = imx_rpmsg_rtc_suspend,
.suspend_noirq = imx_rpmsg_rtc_suspend_noirq,
.resume = imx_rpmsg_rtc_resume,
.resume_noirq = imx_rpmsg_rtc_resume_noirq,
};
#define IMX_RPMSG_RTC_PM_OPS (&imx_rpmsg_rtc_pm_ops)
#else
#define IMX8_RPMSG_RTC_PM_OPS NULL
#endif
static const struct of_device_id imx_rpmsg_rtc_dt_ids[] = {
{ .compatible = "fsl,imx-rpmsg-rtc", },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, imx_rpmsg_rtc_dt_ids);
static struct platform_driver imx_rpmsg_rtc_driver = {
.driver = {
.name = "imx_rpmsg_rtc",
.pm = IMX_RPMSG_RTC_PM_OPS,
.of_match_table = imx_rpmsg_rtc_dt_ids,
},
.probe = imx_rpmsg_rtc_probe,
};
module_platform_driver(imx_rpmsg_rtc_driver);
MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
MODULE_DESCRIPTION("NXP i.MX RPMSG RTC Driver");
MODULE_LICENSE("GPL");