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rtc: imx-sc: add rtc set time support

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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>
This commit is contained in:
Anson Huang 2019-01-22 03:29:24 +00:00 committed by Alexandre Belloni
parent 761acdda5c
commit 13a929f38a
1 changed files with 19 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

19
drivers/rtc/rtc-imx-sc.c
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@ -3,6 +3,7 @@
* Copyright 2018 NXP. * Copyright 2018 NXP.
*/ */
#include <linux/arm-smccc.h>
#include <linux/firmware/imx/sci.h> #include <linux/firmware/imx/sci.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/of.h> #include <linux/of.h>
@ -12,6 +13,9 @@
#define IMX_SC_TIMER_FUNC_GET_RTC_SEC1970 9 #define IMX_SC_TIMER_FUNC_GET_RTC_SEC1970 9
#define IMX_SC_TIMER_FUNC_SET_RTC_TIME 6 #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 imx_sc_ipc *rtc_ipc_handle;
static struct rtc_device *imx_sc_rtc; 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; 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 = { static const struct rtc_class_ops imx_sc_rtc_ops = {
.read_time = imx_sc_rtc_read_time, .read_time = imx_sc_rtc_read_time,
.set_time = imx_sc_rtc_set_time,
}; };
static int imx_sc_rtc_probe(struct platform_device *pdev) static int imx_sc_rtc_probe(struct platform_device *pdev)