1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright 2018 NXP. 4 */ 5 6 #include <linux/firmware/imx/sci.h> 7 #include <linux/module.h> 8 #include <linux/of.h> 9 #include <linux/platform_device.h> 10 #include <linux/rtc.h> 11 12 #define IMX_SC_TIMER_FUNC_GET_RTC_SEC1970 9 13 #define IMX_SC_TIMER_FUNC_SET_RTC_TIME 6 14 15 static struct imx_sc_ipc *rtc_ipc_handle; 16 static struct rtc_device *imx_sc_rtc; 17 18 struct imx_sc_msg_timer_get_rtc_time { 19 struct imx_sc_rpc_msg hdr; 20 u32 time; 21 } __packed; 22 23 static int imx_sc_rtc_read_time(struct device *dev, struct rtc_time *tm) 24 { 25 struct imx_sc_msg_timer_get_rtc_time msg; 26 struct imx_sc_rpc_msg *hdr = &msg.hdr; 27 int ret; 28 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; 32 hdr->size = 1; 33 34 ret = imx_scu_call_rpc(rtc_ipc_handle, &msg, true); 35 if (ret) { 36 dev_err(dev, "read rtc time failed, ret %d\n", ret); 37 return ret; 38 } 39 40 rtc_time_to_tm(msg.time, tm); 41 42 return 0; 43 } 44 45 static const struct rtc_class_ops imx_sc_rtc_ops = { 46 .read_time = imx_sc_rtc_read_time, 47 }; 48 49 static int imx_sc_rtc_probe(struct platform_device *pdev) 50 { 51 int ret; 52 53 ret = imx_scu_get_handle(&rtc_ipc_handle); 54 if (ret) 55 return ret; 56 57 imx_sc_rtc = devm_rtc_allocate_device(&pdev->dev); 58 if (IS_ERR(imx_sc_rtc)) 59 return PTR_ERR(imx_sc_rtc); 60 61 imx_sc_rtc->ops = &imx_sc_rtc_ops; 62 imx_sc_rtc->range_min = 0; 63 imx_sc_rtc->range_max = U32_MAX; 64 65 ret = rtc_register_device(imx_sc_rtc); 66 if (ret) { 67 dev_err(&pdev->dev, "failed to register rtc: %d\n", ret); 68 return ret; 69 } 70 71 return 0; 72 } 73 74 static const struct of_device_id imx_sc_dt_ids[] = { 75 { .compatible = "fsl,imx8qxp-sc-rtc", }, 76 {} 77 }; 78 MODULE_DEVICE_TABLE(of, imx_sc_dt_ids); 79 80 static struct platform_driver imx_sc_rtc_driver = { 81 .driver = { 82 .name = "imx-sc-rtc", 83 .of_match_table = imx_sc_dt_ids, 84 }, 85 .probe = imx_sc_rtc_probe, 86 }; 87 module_platform_driver(imx_sc_rtc_driver); 88 89 MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>"); 90 MODULE_DESCRIPTION("NXP i.MX System Controller RTC Driver"); 91 MODULE_LICENSE("GPL"); 92