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Commit 13a929f3 authored by Anson Huang's avatar Anson Huang Committed by Alexandre Belloni
Browse files

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: default avatarAnson Huang <Anson.Huang@nxp.com>
Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent 761acdda

drivers/rtc/rtc-imx-sc.c

+19 −0
Original line number Diff line number Diff line
@@ -3,6 +3,7 @@ 
 * Copyright 2018 NXP.

 */



#include <linux/arm-smccc.h>

#include <linux/firmware/imx/sci.h>

#include <linux/module.h>

#include <linux/of.h>
@@ -12,6 +13,9 @@ 
#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;
@@ -42,8 +46,23 @@ static int imx_sc_rtc_read_time(struct device *dev, struct rtc_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)