linux-imx

// 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 = {