1*e01b5781SAnson Huang // SPDX-License-Identifier: GPL-2.0+ 2*e01b5781SAnson Huang /* 3*e01b5781SAnson Huang * Copyright 2018 NXP. 4*e01b5781SAnson Huang */ 5*e01b5781SAnson Huang 6*e01b5781SAnson Huang #include <linux/firmware/imx/sci.h> 7*e01b5781SAnson Huang #include <linux/module.h> 8*e01b5781SAnson Huang #include <linux/of.h> 9*e01b5781SAnson Huang #include <linux/platform_device.h> 10*e01b5781SAnson Huang #include <linux/rtc.h> 11*e01b5781SAnson Huang 12*e01b5781SAnson Huang #define IMX_SC_TIMER_FUNC_GET_RTC_SEC1970 9 13*e01b5781SAnson Huang #define IMX_SC_TIMER_FUNC_SET_RTC_TIME 6 14*e01b5781SAnson Huang 15*e01b5781SAnson Huang static struct imx_sc_ipc *rtc_ipc_handle; 16*e01b5781SAnson Huang static struct rtc_device *imx_sc_rtc; 17*e01b5781SAnson Huang 18*e01b5781SAnson Huang struct imx_sc_msg_timer_get_rtc_time { 19*e01b5781SAnson Huang struct imx_sc_rpc_msg hdr; 20*e01b5781SAnson Huang u32 time; 21*e01b5781SAnson Huang } __packed; 22*e01b5781SAnson Huang 23*e01b5781SAnson Huang static int imx_sc_rtc_read_time(struct device *dev, struct rtc_time *tm) 24*e01b5781SAnson Huang { 25*e01b5781SAnson Huang struct imx_sc_msg_timer_get_rtc_time msg; 26*e01b5781SAnson Huang struct imx_sc_rpc_msg *hdr = &msg.hdr; 27*e01b5781SAnson Huang int ret; 28*e01b5781SAnson Huang 29*e01b5781SAnson Huang hdr->ver = IMX_SC_RPC_VERSION; 30*e01b5781SAnson Huang hdr->svc = IMX_SC_RPC_SVC_TIMER; 31*e01b5781SAnson Huang hdr->func = IMX_SC_TIMER_FUNC_GET_RTC_SEC1970; 32*e01b5781SAnson Huang hdr->size = 1; 33*e01b5781SAnson Huang 34*e01b5781SAnson Huang ret = imx_scu_call_rpc(rtc_ipc_handle, &msg, true); 35*e01b5781SAnson Huang if (ret) { 36*e01b5781SAnson Huang dev_err(dev, "read rtc time failed, ret %d\n", ret); 37*e01b5781SAnson Huang return ret; 38*e01b5781SAnson Huang } 39*e01b5781SAnson Huang 40*e01b5781SAnson Huang rtc_time_to_tm(msg.time, tm); 41*e01b5781SAnson Huang 42*e01b5781SAnson Huang return 0; 43*e01b5781SAnson Huang } 44*e01b5781SAnson Huang 45*e01b5781SAnson Huang static const struct rtc_class_ops imx_sc_rtc_ops = { 46*e01b5781SAnson Huang .read_time = imx_sc_rtc_read_time, 47*e01b5781SAnson Huang }; 48*e01b5781SAnson Huang 49*e01b5781SAnson Huang static int imx_sc_rtc_probe(struct platform_device *pdev) 50*e01b5781SAnson Huang { 51*e01b5781SAnson Huang int ret; 52*e01b5781SAnson Huang 53*e01b5781SAnson Huang ret = imx_scu_get_handle(&rtc_ipc_handle); 54*e01b5781SAnson Huang if (ret) 55*e01b5781SAnson Huang return ret; 56*e01b5781SAnson Huang 57*e01b5781SAnson Huang imx_sc_rtc = devm_rtc_allocate_device(&pdev->dev); 58*e01b5781SAnson Huang if (IS_ERR(imx_sc_rtc)) 59*e01b5781SAnson Huang return PTR_ERR(imx_sc_rtc); 60*e01b5781SAnson Huang 61*e01b5781SAnson Huang imx_sc_rtc->ops = &imx_sc_rtc_ops; 62*e01b5781SAnson Huang imx_sc_rtc->range_min = 0; 63*e01b5781SAnson Huang imx_sc_rtc->range_max = U32_MAX; 64*e01b5781SAnson Huang 65*e01b5781SAnson Huang ret = rtc_register_device(imx_sc_rtc); 66*e01b5781SAnson Huang if (ret) { 67*e01b5781SAnson Huang dev_err(&pdev->dev, "failed to register rtc: %d\n", ret); 68*e01b5781SAnson Huang return ret; 69*e01b5781SAnson Huang } 70*e01b5781SAnson Huang 71*e01b5781SAnson Huang return 0; 72*e01b5781SAnson Huang } 73*e01b5781SAnson Huang 74*e01b5781SAnson Huang static const struct of_device_id imx_sc_dt_ids[] = { 75*e01b5781SAnson Huang { .compatible = "fsl,imx8qxp-sc-rtc", }, 76*e01b5781SAnson Huang {} 77*e01b5781SAnson Huang }; 78*e01b5781SAnson Huang MODULE_DEVICE_TABLE(of, imx_sc_dt_ids); 79*e01b5781SAnson Huang 80*e01b5781SAnson Huang static struct platform_driver imx_sc_rtc_driver = { 81*e01b5781SAnson Huang .driver = { 82*e01b5781SAnson Huang .name = "imx-sc-rtc", 83*e01b5781SAnson Huang .of_match_table = imx_sc_dt_ids, 84*e01b5781SAnson Huang }, 85*e01b5781SAnson Huang .probe = imx_sc_rtc_probe, 86*e01b5781SAnson Huang }; 87*e01b5781SAnson Huang module_platform_driver(imx_sc_rtc_driver); 88*e01b5781SAnson Huang 89*e01b5781SAnson Huang MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>"); 90*e01b5781SAnson Huang MODULE_DESCRIPTION("NXP i.MX System Controller RTC Driver"); 91*e01b5781SAnson Huang MODULE_LICENSE("GPL"); 92