384 lines
8.1 KiB
C
384 lines
8.1 KiB
C
/*
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* Copyright 2017-2018 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/init.h>
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#include <linux/io.h>
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#include <linux/imx_rpmsg.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/pm_qos.h>
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#include <linux/rpmsg.h>
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#include <linux/rtc.h>
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#define RPMSG_TIMEOUT 1000
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#define RTC_RPMSG_SEND 0x0
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#define RTC_RPMSG_RECEIVE 0x1
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#define RTC_RPMSG_NOTIFY 0x2
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enum rtc_rpmsg_cmd {
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RTC_RPMSG_SET_TIME,
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RTC_RPMSG_GET_TIME,
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RTC_RPMSG_SET_ALARM,
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RTC_RPMSG_GET_ALARM,
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RTC_RPMSG_ENABLE_ALARM,
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};
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struct rtc_rpmsg_data {
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struct imx_rpmsg_head header;
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u8 reserved0;
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union {
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u8 reserved1;
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u8 ret;
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};
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union {
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u32 reserved2;
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u32 sec;
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};
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union {
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u8 enable;
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u8 reserved3;
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};
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union {
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u8 pending;
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u8 reserved4;
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};
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} __attribute__ ((packed));
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struct rtc_rpmsg_info {
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struct rpmsg_device *rpdev;
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struct device *dev;
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struct rtc_rpmsg_data *msg;
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struct pm_qos_request pm_qos_req;
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struct completion cmd_complete;
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struct mutex lock;
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};
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static struct rtc_rpmsg_info rtc_rpmsg;
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struct imx_rpmsg_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_rpmsg_rtc_data *data;
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static int rtc_send_message(struct rtc_rpmsg_data *msg,
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struct rtc_rpmsg_info *info, bool ack)
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{
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int err;
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if (!info->rpdev) {
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dev_dbg(info->dev,
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"rpmsg channel not ready, m4 image ready?\n");
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return -EINVAL;
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}
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mutex_lock(&info->lock);
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pm_qos_add_request(&info->pm_qos_req,
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PM_QOS_CPU_DMA_LATENCY, 0);
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reinit_completion(&info->cmd_complete);
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err = rpmsg_send(info->rpdev->ept, (void *)msg,
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sizeof(struct rtc_rpmsg_data));
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if (err) {
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dev_err(&info->rpdev->dev, "rpmsg_send failed: %d\n", err);
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goto err_out;
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}
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if (ack) {
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err = wait_for_completion_timeout(&info->cmd_complete,
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msecs_to_jiffies(RPMSG_TIMEOUT));
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if (!err) {
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dev_err(&info->rpdev->dev, "rpmsg_send timeout!\n");
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err = -ETIMEDOUT;
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goto err_out;
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}
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if (info->msg->ret != 0) {
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dev_err(&info->rpdev->dev, "rpmsg not ack %d!\n",
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info->msg->ret);
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err = -EINVAL;
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goto err_out;
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}
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err = 0;
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}
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err_out:
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pm_qos_remove_request(&info->pm_qos_req);
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mutex_unlock(&info->lock);
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return err;
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}
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static int imx_rpmsg_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct rtc_rpmsg_data msg;
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int ret;
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msg.header.cate = IMX_RPMSG_RTC;
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msg.header.major = IMX_RMPSG_MAJOR;
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msg.header.minor = IMX_RMPSG_MINOR;
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msg.header.type = RTC_RPMSG_SEND;
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msg.header.cmd = RTC_RPMSG_GET_TIME;
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ret = rtc_send_message(&msg, &rtc_rpmsg, true);
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if (ret)
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return ret;
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rtc_time_to_tm(rtc_rpmsg.msg->sec, tm);
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return 0;
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}
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static int imx_rpmsg_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct rtc_rpmsg_data msg;
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unsigned long time;
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int ret;
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rtc_tm_to_time(tm, &time);
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msg.header.cate = IMX_RPMSG_RTC;
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msg.header.major = IMX_RMPSG_MAJOR;
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msg.header.minor = IMX_RMPSG_MINOR;
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msg.header.type = RTC_RPMSG_SEND;
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msg.header.cmd = RTC_RPMSG_SET_TIME;
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msg.sec = time;
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ret = rtc_send_message(&msg, &rtc_rpmsg, true);
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if (ret)
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return ret;
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return rtc_rpmsg.msg->ret;
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}
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static int imx_rpmsg_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct rtc_rpmsg_data msg;
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int ret;
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msg.header.cate = IMX_RPMSG_RTC;
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msg.header.major = IMX_RMPSG_MAJOR;
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msg.header.minor = IMX_RMPSG_MINOR;
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msg.header.type = RTC_RPMSG_SEND;
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msg.header.cmd = RTC_RPMSG_GET_ALARM;
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ret = rtc_send_message(&msg, &rtc_rpmsg, true);
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if (ret)
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return ret;
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rtc_time_to_tm(rtc_rpmsg.msg->sec, &alrm->time);
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alrm->pending = rtc_rpmsg.msg->pending;
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return rtc_rpmsg.msg->ret;
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}
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static int imx_rpmsg_rtc_alarm_irq_enable(struct device *dev,
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unsigned int enable)
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{
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struct rtc_rpmsg_data msg;
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int ret;
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msg.header.cate = IMX_RPMSG_RTC;
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msg.header.major = IMX_RMPSG_MAJOR;
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msg.header.minor = IMX_RMPSG_MINOR;
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msg.header.type = RTC_RPMSG_SEND;
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msg.header.cmd = RTC_RPMSG_ENABLE_ALARM;
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msg.enable = enable;
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ret = rtc_send_message(&msg, &rtc_rpmsg, true);
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if (ret)
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return ret;
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return rtc_rpmsg.msg->ret;
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}
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static int imx_rpmsg_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct rtc_rpmsg_data msg;
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unsigned long time;
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int ret;
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rtc_tm_to_time(&alrm->time, &time);
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msg.header.cate = IMX_RPMSG_RTC;
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msg.header.major = IMX_RMPSG_MAJOR;
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msg.header.minor = IMX_RMPSG_MINOR;
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msg.header.type = RTC_RPMSG_SEND;
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msg.header.cmd = RTC_RPMSG_SET_ALARM;
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msg.sec = time;
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msg.enable = alrm->enabled;
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ret = rtc_send_message(&msg, &rtc_rpmsg, true);
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if (ret)
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return ret;
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return rtc_rpmsg.msg->ret;
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}
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static int imx_rpmsg_rtc_alarm_irq_update(void)
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{
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rtc_update_irq(data->rtc, 1, RTC_IRQF);
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return 0;
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}
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static const struct rtc_class_ops imx_rpmsg_rtc_ops = {
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.read_time = imx_rpmsg_rtc_read_time,
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.set_time = imx_rpmsg_rtc_set_time,
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.read_alarm = imx_rpmsg_rtc_read_alarm,
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.set_alarm = imx_rpmsg_rtc_set_alarm,
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.alarm_irq_enable = imx_rpmsg_rtc_alarm_irq_enable,
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};
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static struct rpmsg_device_id rtc_rpmsg_id_table[] = {
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{ .name = "rpmsg-rtc-channel" },
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{ },
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};
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static int rtc_rpmsg_probe(struct rpmsg_device *rpdev)
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{
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int ret = 0;
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dev_info(&rpdev->dev, "new channel: 0x%x -> 0x%x!\n",
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rpdev->src, rpdev->dst);
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rtc_rpmsg.rpdev = rpdev;
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mutex_init(&rtc_rpmsg.lock);
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init_completion(&rtc_rpmsg.cmd_complete);
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return ret;
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}
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static int rtc_rpmsg_cb(struct rpmsg_device *rpdev, void *data, int len,
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void *priv, u32 src)
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{
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struct rtc_rpmsg_data *msg = (struct rtc_rpmsg_data *)data;
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if (msg->header.type == RTC_RPMSG_RECEIVE) {
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rtc_rpmsg.msg = msg;
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complete(&rtc_rpmsg.cmd_complete);
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return 0;
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} else if (msg->header.type == RTC_RPMSG_NOTIFY) {
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rtc_rpmsg.msg = msg;
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imx_rpmsg_rtc_alarm_irq_update();
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} else
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dev_err(&rtc_rpmsg.rpdev->dev, "wrong command type!\n");
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return 0;
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}
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static void rtc_rpmsg_remove(struct rpmsg_device *rpdev)
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{
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dev_info(&rpdev->dev, "rtc rpmsg driver is removed\n");
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}
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static struct rpmsg_driver rtc_rpmsg_driver = {
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.drv.name = "rtc_rpmsg",
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.drv.owner = THIS_MODULE,
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.id_table = rtc_rpmsg_id_table,
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.probe = rtc_rpmsg_probe,
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.callback = rtc_rpmsg_cb,
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.remove = rtc_rpmsg_remove,
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};
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static int imx_rpmsg_rtc_probe(struct platform_device *pdev)
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{
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int ret = 0;
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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_rpmsg_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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ret = register_rpmsg_driver(&rtc_rpmsg_driver);
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if (ret)
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dev_err(&pdev->dev, "failed to register rpmsg for rtc: %d\n",
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ret);
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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_rpmsg_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_rpmsg_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_rpmsg_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_rpmsg_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_rpmsg_rtc_pm_ops = {
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.suspend = imx_rpmsg_rtc_suspend,
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.suspend_noirq = imx_rpmsg_rtc_suspend_noirq,
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.resume = imx_rpmsg_rtc_resume,
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.resume_noirq = imx_rpmsg_rtc_resume_noirq,
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};
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#define IMX_RPMSG_RTC_PM_OPS (&imx_rpmsg_rtc_pm_ops)
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#else
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#define IMX_RPMSG_RTC_PM_OPS NULL
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#endif
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static const struct of_device_id imx_rpmsg_rtc_dt_ids[] = {
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{ .compatible = "fsl,imx-rpmsg-rtc", },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, imx_rpmsg_rtc_dt_ids);
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static struct platform_driver imx_rpmsg_rtc_driver = {
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.driver = {
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.name = "imx_rpmsg_rtc",
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.pm = IMX_RPMSG_RTC_PM_OPS,
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.of_match_table = imx_rpmsg_rtc_dt_ids,
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},
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.probe = imx_rpmsg_rtc_probe,
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};
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module_platform_driver(imx_rpmsg_rtc_driver);
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MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
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MODULE_DESCRIPTION("NXP i.MX RPMSG RTC Driver");
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MODULE_LICENSE("GPL");
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