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Subject[PATCH V7 4/4] rtc: imx-sc: add rtc alarm support
Date
Add i.MX system controller RTC alarm support, the RTC alarm
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 alarm. When RTC alarm fires,
system controller will generate a common MU irq event and notify
system controller RTC driver to handle the irq event.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com>
---
Changes since V6:
- add comments to .read_alarm callback function to explain why it is an empty function;
- improve irq notify callback function name.
--
drivers/rtc/rtc-imx-sc.c | 87 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 87 insertions(+)

diff --git a/drivers/rtc/rtc-imx-sc.c b/drivers/rtc/rtc-imx-sc.c
index 19642bf..c933045 100644
--- a/drivers/rtc/rtc-imx-sc.c
+++ b/drivers/rtc/rtc-imx-sc.c
@@ -3,6 +3,7 @@
* Copyright 2018 NXP.
*/

+#include <dt-bindings/firmware/imx/rsrc.h>
#include <linux/arm-smccc.h>
#include <linux/firmware/imx/sci.h>
#include <linux/module.h>
@@ -11,11 +12,15 @@
#include <linux/rtc.h>

#define IMX_SC_TIMER_FUNC_GET_RTC_SEC1970 9
+#define IMX_SC_TIMER_FUNC_SET_RTC_ALARM 8
#define IMX_SC_TIMER_FUNC_SET_RTC_TIME 6

#define IMX_SIP_SRTC 0xC2000002
#define IMX_SIP_SRTC_SET_TIME 0x0

+#define SC_IRQ_GROUP_RTC 2
+#define SC_IRQ_RTC 1
+
static struct imx_sc_ipc *rtc_ipc_handle;
static struct rtc_device *imx_sc_rtc;

@@ -24,6 +29,16 @@ struct imx_sc_msg_timer_get_rtc_time {
u32 time;
} __packed;

+struct imx_sc_msg_timer_rtc_set_alarm {
+ struct imx_sc_rpc_msg hdr;
+ u16 year;
+ u8 mon;
+ u8 day;
+ u8 hour;
+ u8 min;
+ u8 sec;
+} __packed;
+
static int imx_sc_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct imx_sc_msg_timer_get_rtc_time msg;
@@ -60,9 +75,77 @@ static int imx_sc_rtc_set_time(struct device *dev, struct rtc_time *tm)
return res.a0;
}

+static int imx_sc_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
+{
+ return imx_scu_irq_group_enable(SC_IRQ_GROUP_RTC, SC_IRQ_RTC, enable);
+}
+
+static int imx_sc_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ /*
+ * SCU firmware does NOT provide read alarm API, but .read_alarm
+ * callback is required by RTC framework to support alarm function,
+ * so just return here.
+ */
+ return 0;
+}
+
+static int imx_sc_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct imx_sc_msg_timer_rtc_set_alarm msg;
+ struct imx_sc_rpc_msg *hdr = &msg.hdr;
+ int ret;
+ struct rtc_time *alrm_tm = &alrm->time;
+
+ hdr->ver = IMX_SC_RPC_VERSION;
+ hdr->svc = IMX_SC_RPC_SVC_TIMER;
+ hdr->func = IMX_SC_TIMER_FUNC_SET_RTC_ALARM;
+ hdr->size = 3;
+
+ msg.year = alrm_tm->tm_year + 1900;
+ msg.mon = alrm_tm->tm_mon + 1;
+ msg.day = alrm_tm->tm_mday;
+ msg.hour = alrm_tm->tm_hour;
+ msg.min = alrm_tm->tm_min;
+ msg.sec = alrm_tm->tm_sec;
+
+ ret = imx_scu_call_rpc(rtc_ipc_handle, &msg, true);
+ if (ret) {
+ dev_err(dev, "set rtc alarm failed, ret %d\n", ret);
+ return ret;
+ }
+
+ ret = imx_sc_rtc_alarm_irq_enable(dev, alrm->enabled);
+ if (ret) {
+ dev_err(dev, "enable rtc alarm failed, ret %d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
static const struct rtc_class_ops imx_sc_rtc_ops = {
.read_time = imx_sc_rtc_read_time,
.set_time = imx_sc_rtc_set_time,
+ .read_alarm = imx_sc_rtc_read_alarm,
+ .set_alarm = imx_sc_rtc_set_alarm,
+ .alarm_irq_enable = imx_sc_rtc_alarm_irq_enable,
+};
+
+static int imx_sc_rtc_alarm_notify(struct notifier_block *nb,
+ unsigned long event, void *group)
+{
+ /* ignore non-rtc irq */
+ if (!((event & SC_IRQ_RTC) && (*(u8 *)group == SC_IRQ_GROUP_RTC)))
+ return 0;
+
+ rtc_update_irq(imx_sc_rtc, 1, RTC_IRQF | RTC_AF);
+
+ return 0;
+}
+
+static struct notifier_block imx_sc_rtc_alarm_sc_notifier = {
+ .notifier_call = imx_sc_rtc_alarm_notify,
};

static int imx_sc_rtc_probe(struct platform_device *pdev)
@@ -73,6 +156,8 @@ static int imx_sc_rtc_probe(struct platform_device *pdev)
if (ret)
return ret;

+ device_init_wakeup(&pdev->dev, true);
+
imx_sc_rtc = devm_rtc_allocate_device(&pdev->dev);
if (IS_ERR(imx_sc_rtc))
return PTR_ERR(imx_sc_rtc);
@@ -87,6 +172,8 @@ static int imx_sc_rtc_probe(struct platform_device *pdev)
return ret;
}

+ imx_scu_irq_register_notifier(&imx_sc_rtc_alarm_sc_notifier);
+
return 0;
}

--
2.7.4
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