1 // SPDX-License-Identifier: GPL-2.0+
6 #include <linux/firmware/imx/sci.h>
7 #include <linux/module.h>
9 #include <linux/platform_device.h>
10 #include <linux/rtc.h>
12 #define IMX_SC_TIMER_FUNC_GET_RTC_SEC1970 9
13 #define IMX_SC_TIMER_FUNC_SET_RTC_TIME 6
15 static struct imx_sc_ipc *rtc_ipc_handle;
16 static struct rtc_device *imx_sc_rtc;
18 struct imx_sc_msg_timer_get_rtc_time {
19 struct imx_sc_rpc_msg hdr;
23 static int imx_sc_rtc_read_time(struct device *dev, struct rtc_time *tm)
25 struct imx_sc_msg_timer_get_rtc_time msg;
26 struct imx_sc_rpc_msg *hdr = &msg.hdr;
29 hdr->ver = IMX_SC_RPC_VERSION;
30 hdr->svc = IMX_SC_RPC_SVC_TIMER;
31 hdr->func = IMX_SC_TIMER_FUNC_GET_RTC_SEC1970;
34 ret = imx_scu_call_rpc(rtc_ipc_handle, &msg, true);
36 dev_err(dev, "read rtc time failed, ret %d\n", ret);
40 rtc_time_to_tm(msg.time, tm);
45 static const struct rtc_class_ops imx_sc_rtc_ops = {
46 .read_time = imx_sc_rtc_read_time,
49 static int imx_sc_rtc_probe(struct platform_device *pdev)
53 ret = imx_scu_get_handle(&rtc_ipc_handle);
57 imx_sc_rtc = devm_rtc_allocate_device(&pdev->dev);
58 if (IS_ERR(imx_sc_rtc))
59 return PTR_ERR(imx_sc_rtc);
61 imx_sc_rtc->ops = &imx_sc_rtc_ops;
62 imx_sc_rtc->range_min = 0;
63 imx_sc_rtc->range_max = U32_MAX;
65 ret = rtc_register_device(imx_sc_rtc);
67 dev_err(&pdev->dev, "failed to register rtc: %d\n", ret);
74 static const struct of_device_id imx_sc_dt_ids[] = {
75 { .compatible = "fsl,imx8qxp-sc-rtc", },
78 MODULE_DEVICE_TABLE(of, imx_sc_dt_ids);
80 static struct platform_driver imx_sc_rtc_driver = {
83 .of_match_table = imx_sc_dt_ids,
85 .probe = imx_sc_rtc_probe,
87 module_platform_driver(imx_sc_rtc_driver);
89 MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
90 MODULE_DESCRIPTION("NXP i.MX System Controller RTC Driver");
91 MODULE_LICENSE("GPL");