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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>
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1 changed files with 87 additions and 0 deletions
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@ -3,6 +3,7 @@
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* Copyright 2018 NXP.
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*/
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#include <dt-bindings/firmware/imx/rsrc.h>
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#include <linux/arm-smccc.h>
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#include <linux/firmware/imx/sci.h>
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#include <linux/module.h>
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@ -11,11 +12,15 @@
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#include <linux/rtc.h>
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#define IMX_SC_TIMER_FUNC_GET_RTC_SEC1970 9
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#define IMX_SC_TIMER_FUNC_SET_RTC_ALARM 8
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#define IMX_SC_TIMER_FUNC_SET_RTC_TIME 6
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#define IMX_SIP_SRTC 0xC2000002
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#define IMX_SIP_SRTC_SET_TIME 0x0
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#define SC_IRQ_GROUP_RTC 2
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#define SC_IRQ_RTC 1
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static struct imx_sc_ipc *rtc_ipc_handle;
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static struct rtc_device *imx_sc_rtc;
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@ -24,6 +29,16 @@ struct imx_sc_msg_timer_get_rtc_time {
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u32 time;
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} __packed;
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struct imx_sc_msg_timer_rtc_set_alarm {
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struct imx_sc_rpc_msg hdr;
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u16 year;
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u8 mon;
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u8 day;
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u8 hour;
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u8 min;
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u8 sec;
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} __packed;
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static int imx_sc_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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struct imx_sc_msg_timer_get_rtc_time msg;
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@ -60,9 +75,77 @@ static int imx_sc_rtc_set_time(struct device *dev, struct rtc_time *tm)
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return res.a0;
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}
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static int imx_sc_rtc_alarm_irq_enable(struct device *dev, unsigned int enable)
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{
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return imx_scu_irq_group_enable(SC_IRQ_GROUP_RTC, SC_IRQ_RTC, enable);
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}
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static int imx_sc_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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/*
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* SCU firmware does NOT provide read alarm API, but .read_alarm
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* callback is required by RTC framework to support alarm function,
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* so just return here.
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*/
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return 0;
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}
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static int imx_sc_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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struct imx_sc_msg_timer_rtc_set_alarm msg;
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struct imx_sc_rpc_msg *hdr = &msg.hdr;
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int ret;
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struct rtc_time *alrm_tm = &alrm->time;
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hdr->ver = IMX_SC_RPC_VERSION;
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hdr->svc = IMX_SC_RPC_SVC_TIMER;
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hdr->func = IMX_SC_TIMER_FUNC_SET_RTC_ALARM;
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hdr->size = 3;
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msg.year = alrm_tm->tm_year + 1900;
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msg.mon = alrm_tm->tm_mon + 1;
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msg.day = alrm_tm->tm_mday;
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msg.hour = alrm_tm->tm_hour;
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msg.min = alrm_tm->tm_min;
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msg.sec = alrm_tm->tm_sec;
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ret = imx_scu_call_rpc(rtc_ipc_handle, &msg, true);
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if (ret) {
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dev_err(dev, "set rtc alarm failed, ret %d\n", ret);
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return ret;
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}
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ret = imx_sc_rtc_alarm_irq_enable(dev, alrm->enabled);
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if (ret) {
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dev_err(dev, "enable rtc alarm failed, ret %d\n", ret);
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return ret;
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}
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return 0;
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}
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static const struct rtc_class_ops imx_sc_rtc_ops = {
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.read_time = imx_sc_rtc_read_time,
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.set_time = imx_sc_rtc_set_time,
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.read_alarm = imx_sc_rtc_read_alarm,
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.set_alarm = imx_sc_rtc_set_alarm,
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.alarm_irq_enable = imx_sc_rtc_alarm_irq_enable,
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};
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static int imx_sc_rtc_alarm_notify(struct notifier_block *nb,
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unsigned long event, void *group)
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{
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/* ignore non-rtc irq */
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if (!((event & SC_IRQ_RTC) && (*(u8 *)group == SC_IRQ_GROUP_RTC)))
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return 0;
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rtc_update_irq(imx_sc_rtc, 1, RTC_IRQF | RTC_AF);
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return 0;
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}
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static struct notifier_block imx_sc_rtc_alarm_sc_notifier = {
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.notifier_call = imx_sc_rtc_alarm_notify,
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};
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static int imx_sc_rtc_probe(struct platform_device *pdev)
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@ -73,6 +156,8 @@ static int imx_sc_rtc_probe(struct platform_device *pdev)
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if (ret)
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return ret;
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device_init_wakeup(&pdev->dev, true);
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imx_sc_rtc = devm_rtc_allocate_device(&pdev->dev);
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if (IS_ERR(imx_sc_rtc))
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return PTR_ERR(imx_sc_rtc);
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@ -87,6 +172,8 @@ static int imx_sc_rtc_probe(struct platform_device *pdev)
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return ret;
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}
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imx_scu_irq_register_notifier(&imx_sc_rtc_alarm_sc_notifier);
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return 0;
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}
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