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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright 2018 NXP.
*/
#include <linux/arm-smccc.h>
#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
#define IMX_SIP_SRTC 0xC2000002
#define IMX_SIP_SRTC_SET_TIME 0x0
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_time64_to_tm(msg.time, tm);
return 0;
}
static int imx_sc_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
struct arm_smccc_res res;
/* pack 2 time parameters into 1 register, 16 bits for each */
arm_smccc_smc(IMX_SIP_SRTC, IMX_SIP_SRTC_SET_TIME,
((tm->tm_year + 1900) << 16) | (tm->tm_mon + 1),
(tm->tm_mday << 16) | tm->tm_hour,
(tm->tm_min << 16) | tm->tm_sec,
0, 0, 0, &res);
return res.a0;
}
static const struct rtc_class_ops imx_sc_rtc_ops = {
.read_time = imx_sc_rtc_read_time,
.set_time = imx_sc_rtc_set_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");
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