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SubjectRe: [PATCH V5 4/4] rtc: imx-sc: add rtc alarm support
On 18/03/2019 03:10:06+0000, Anson Huang wrote:
> 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>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

> ---
> No function changes, just update imx_scu_irq_register_notifier() function name
> according to SCU IRQ function name change.
> ---
> drivers/rtc/rtc-imx-sc.c | 112 +++++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 112 insertions(+)
>
> diff --git a/drivers/rtc/rtc-imx-sc.c b/drivers/rtc/rtc-imx-sc.c
> index 19642bf..9df4990 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 +12,17 @@
> #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_SC_IRQ_FUNC_ENABLE 1
> +
> #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 +31,24 @@ struct imx_sc_msg_timer_get_rtc_time {
> u32 time;
> } __packed;
>
> +struct imx_sc_msg_timer_enable_irq {
> + struct imx_sc_rpc_msg hdr;
> + u32 mask;
> + u16 resource;
> + u8 group;
> + u8 enable;
> +} __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 +85,92 @@ 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)
> +{
> + struct imx_sc_msg_timer_enable_irq msg;
> + struct imx_sc_rpc_msg *hdr = &msg.hdr;
> + int ret;
> +
> + hdr->ver = IMX_SC_RPC_VERSION;
> + hdr->svc = IMX_SC_RPC_SVC_IRQ;
> + hdr->func = IMX_SC_IRQ_FUNC_ENABLE;
> + hdr->size = 3;
> +
> + msg.resource = IMX_SC_R_MU_1A;
> + msg.group = SC_IRQ_GROUP_RTC;
> + msg.mask = SC_IRQ_RTC;
> + msg.enable = enable;
> +
> + ret = imx_scu_call_rpc(rtc_ipc_handle, &msg, true);
> + if (ret) {
> + dev_err(dev, "enable rtc irq failed, ret %d\n", ret);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +static int imx_sc_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
> +{
> + 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_sc_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_sc_notify,
> };
>
> static int imx_sc_rtc_probe(struct platform_device *pdev)
> @@ -73,6 +181,8 @@ 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 +197,8 @@ 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
>

--
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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