// SPDX-License-Identifier: GPL-2.0+ /* * Copyright 2018 NXP. */ #include <linux/firmware/imx/sci.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/rtc.h> #define IMX_SC_TIMER_FUNC_GET_RTC_SEC1970 9 #define IMX_SC_TIMER_FUNC_SET_RTC_TIME 6 static struct imx_sc_ipc *rtc_ipc_handle; static struct rtc_device *imx_sc_rtc; struct imx_sc_msg_timer_get_rtc_time { struct imx_sc_rpc_msg hdr; u32 time; } __packed; static int imx_sc_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct imx_sc_msg_timer_get_rtc_time msg; struct imx_sc_rpc_msg *hdr = &msg.hdr; int ret; hdr->ver = IMX_SC_RPC_VERSION; hdr->svc = IMX_SC_RPC_SVC_TIMER; hdr->func = IMX_SC_TIMER_FUNC_GET_RTC_SEC1970; hdr->size = 1; ret = imx_scu_call_rpc(rtc_ipc_handle, &msg, true); if (ret) { dev_err(dev, "read rtc time failed, ret %d\n", ret); return ret; } rtc_time_to_tm(msg.time, tm); return 0; } static const struct rtc_class_ops imx_sc_rtc_ops = { .read_time = imx_sc_rtc_read_time, }; static int imx_sc_rtc_probe(struct platform_device *pdev) { int ret; ret = imx_scu_get_handle(&rtc_ipc_handle); if (ret) return ret; imx_sc_rtc = devm_rtc_allocate_device(&pdev->dev); if (IS_ERR(imx_sc_rtc)) return PTR_ERR(imx_sc_rtc); imx_sc_rtc->ops = &imx_sc_rtc_ops; imx_sc_rtc->range_min = 0; imx_sc_rtc->range_max = U32_MAX; ret = rtc_register_device(imx_sc_rtc); if (ret) { dev_err(&pdev->dev, "failed to register rtc: %d\n", ret); return ret; } return 0; } static const struct of_device_id imx_sc_dt_ids[] = { { .compatible = "fsl,imx8qxp-sc-rtc", }, {} }; MODULE_DEVICE_TABLE(of, imx_sc_dt_ids); static struct platform_driver imx_sc_rtc_driver = { .driver = { .name = "imx-sc-rtc", .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 System Controller RTC Driver"); MODULE_LICENSE("GPL");