Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/drivers/rtc/rtc-imx-sc.c b/drivers/rtc/rtc-imx-sc.c
new file mode 100644
index 0000000..cf2c121
--- /dev/null
+++ b/drivers/rtc/rtc-imx-sc.c
@@ -0,0 +1,195 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * 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>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#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;
+
+struct imx_sc_msg_timer_get_rtc_time {
+ struct imx_sc_rpc_msg hdr;
+ 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;
+ struct imx_sc_rpc_msg *hdr = &msg.hdr;
+ int ret;
+
+ hdr->ver = IMX_SC_RPC_VERSION;
+ hdr->svc = IMX_SC_RPC_SVC_TIMER;
+ hdr->func = IMX_SC_TIMER_FUNC_GET_RTC_SEC1970;
+ hdr->size = 1;
+
+ ret = imx_scu_call_rpc(rtc_ipc_handle, &msg, true);
+ if (ret) {
+ dev_err(dev, "read rtc time failed, ret %d\n", ret);
+ return ret;
+ }
+
+ rtc_time64_to_tm(msg.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 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)
+{
+ int ret;
+
+ ret = imx_scu_get_handle(&rtc_ipc_handle);
+ 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);
+
+ imx_sc_rtc->ops = &imx_sc_rtc_ops;
+ imx_sc_rtc->range_min = 0;
+ imx_sc_rtc->range_max = U32_MAX;
+
+ ret = rtc_register_device(imx_sc_rtc);
+ if (ret)
+ return ret;
+
+ imx_scu_irq_register_notifier(&imx_sc_rtc_alarm_sc_notifier);
+
+ return 0;
+}
+
+static const struct of_device_id imx_sc_dt_ids[] = {
+ { .compatible = "fsl,imx8qxp-sc-rtc", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, imx_sc_dt_ids);
+
+static struct platform_driver imx_sc_rtc_driver = {
+ .driver = {
+ .name = "imx-sc-rtc",
+ .of_match_table = imx_sc_dt_ids,
+ },
+ .probe = imx_sc_rtc_probe,
+};
+module_platform_driver(imx_sc_rtc_driver);
+
+MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
+MODULE_DESCRIPTION("NXP i.MX System Controller RTC Driver");
+MODULE_LICENSE("GPL");