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rtc: imx-sc: add rtc set time support
This patch adds i.MX system controller RTC set time support, the RTC set time is implemented via SIP(silicon provider) runtime service call and ARM-Trusted-Firmware will communicate with system controller via MU(message unit) IPC to set RTC time. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
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1 changed files with 19 additions and 0 deletions
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@ -3,6 +3,7 @@
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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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@ -12,6 +13,9 @@
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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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@ -42,8 +46,23 @@ static int imx_sc_rtc_read_time(struct device *dev, struct rtc_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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