111 lines
2.5 KiB
C
111 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2018 NXP.
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*/
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#include <linux/arm-smccc.h>
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#include <linux/firmware/imx/sci.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/rtc.h>
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#define IMX_SC_TIMER_FUNC_GET_RTC_SEC1970 9
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#define IMX_SC_TIMER_FUNC_SET_RTC_TIME 6
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#define IMX_SIP_SRTC 0xC2000002
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#define IMX_SIP_SRTC_SET_TIME 0x0
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static struct imx_sc_ipc *rtc_ipc_handle;
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static struct rtc_device *imx_sc_rtc;
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struct imx_sc_msg_timer_get_rtc_time {
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struct imx_sc_rpc_msg hdr;
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u32 time;
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} __packed;
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static int imx_sc_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct imx_sc_msg_timer_get_rtc_time msg;
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struct imx_sc_rpc_msg *hdr = &msg.hdr;
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int ret;
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hdr->ver = IMX_SC_RPC_VERSION;
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hdr->svc = IMX_SC_RPC_SVC_TIMER;
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hdr->func = IMX_SC_TIMER_FUNC_GET_RTC_SEC1970;
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hdr->size = 1;
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ret = imx_scu_call_rpc(rtc_ipc_handle, &msg, true);
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if (ret) {
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dev_err(dev, "read rtc time failed, ret %d\n", ret);
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return ret;
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}
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rtc_time64_to_tm(msg.time, tm);
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return 0;
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}
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static int imx_sc_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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struct arm_smccc_res res;
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/* pack 2 time parameters into 1 register, 16 bits for each */
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arm_smccc_smc(IMX_SIP_SRTC, IMX_SIP_SRTC_SET_TIME,
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((tm->tm_year + 1900) << 16) | (tm->tm_mon + 1),
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(tm->tm_mday << 16) | tm->tm_hour,
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(tm->tm_min << 16) | tm->tm_sec,
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0, 0, 0, &res);
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return res.a0;
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}
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static const struct rtc_class_ops imx_sc_rtc_ops = {
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.read_time = imx_sc_rtc_read_time,
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.set_time = imx_sc_rtc_set_time,
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};
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static int imx_sc_rtc_probe(struct platform_device *pdev)
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{
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int ret;
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ret = imx_scu_get_handle(&rtc_ipc_handle);
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if (ret)
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return ret;
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imx_sc_rtc = devm_rtc_allocate_device(&pdev->dev);
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if (IS_ERR(imx_sc_rtc))
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return PTR_ERR(imx_sc_rtc);
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imx_sc_rtc->ops = &imx_sc_rtc_ops;
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imx_sc_rtc->range_min = 0;
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imx_sc_rtc->range_max = U32_MAX;
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ret = rtc_register_device(imx_sc_rtc);
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if (ret) {
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dev_err(&pdev->dev, "failed to register rtc: %d\n", ret);
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return ret;
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}
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return 0;
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}
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static const struct of_device_id imx_sc_dt_ids[] = {
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{ .compatible = "fsl,imx8qxp-sc-rtc", },
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{}
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};
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MODULE_DEVICE_TABLE(of, imx_sc_dt_ids);
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static struct platform_driver imx_sc_rtc_driver = {
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.driver = {
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.name = "imx-sc-rtc",
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.of_match_table = imx_sc_dt_ids,
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},
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.probe = imx_sc_rtc_probe,
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};
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module_platform_driver(imx_sc_rtc_driver);
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MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
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MODULE_DESCRIPTION("NXP i.MX System Controller RTC Driver");
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MODULE_LICENSE("GPL");
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