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rtc: imx-sc: add rtc alarm support 

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>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Anson Huang 2019-04-09 05:00:07 +00:00 committed by Alexandre Belloni
parent 42ca37ca47
commit a3094fc1a1
1 changed files with 87 additions and 0 deletions
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87
drivers/rtc/rtc-imx-sc.c
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@ -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;
}