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authorAnson Huang <anson.huang@nxp.com>2019-01-22 06:29:24 +0300
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2019-02-07 22:45:39 +0300
commit13a929f38ad742200270389cedc78c1859726bd8 (patch)
tree4046453d2e2c1bb0317c9f6567b1690f1fe27301 /drivers/rtc
parent761acdda5c2cc89208a94941f69579923420c8e9 (diff)
downloadlinux-13a929f38ad742200270389cedc78c1859726bd8.tar.xz
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>
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/rtc-imx-sc.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-imx-sc.c b/drivers/rtc/rtc-imx-sc.c
index 7ff08544532a..60570a278bb0 100644
--- a/drivers/rtc/rtc-imx-sc.c
+++ b/drivers/rtc/rtc-imx-sc.c
@@ -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)