rtc: add i.MX system controller RTC support

i.MX8QXP is an ARMv8 SoC which has a Cortex-M4 system controller
inside, the system controller is in charge of controlling power,
clock and secure rtc etc..

This patch adds i.MX system controller RTC driver support,
Linux kernel has to communicate with system controller via MU
(message unit) IPC to set/get RTC time and other alarm functions,
since the RTC set time needs to be done in secure EL3 mode (required
by system controller firmware) and alarm functions needs to be done
with general MU IRQ handle, these depend on other components which
are NOT ready, so this patch ONLY enables the RTC time read.

Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index a819ef07b7ec20c7dff85807868c6e850aa39038..225b0b8516f3e4206a29031c47df9381607d6a2a 100644 (file)
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1677,6 +1677,13 @@ config RTC_DRV_SNVS
           This driver can also be built as a module, if so, the module
           will be called "rtc-snvs".
 
+config RTC_DRV_IMX_SC
+       depends on IMX_SCU
+       tristate "NXP i.MX System Controller RTC support"
+       help
+          If you say yes here you get support for the NXP i.MX System
+          Controller RTC module.
+
 config RTC_DRV_SIRFSOC
        tristate "SiRFSOC RTC"
        depends on ARCH_SIRF

diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 290c1730fb0a7d9f31714fa08ba840a9fabce4a1..f97c05ef99dbe9ecc0465bc634f457920ca7bb22 100644 (file)
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -75,6 +75,7 @@ obj-$(CONFIG_RTC_DRV_GOLDFISH)        += rtc-goldfish.o
 obj-$(CONFIG_RTC_DRV_HID_SENSOR_TIME) += rtc-hid-sensor-time.o
 obj-$(CONFIG_RTC_DRV_HYM8563)  += rtc-hym8563.o
 obj-$(CONFIG_RTC_DRV_IMXDI)    += rtc-imxdi.o
+obj-$(CONFIG_RTC_DRV_IMX_SC)   += rtc-imx-sc.o
 obj-$(CONFIG_RTC_DRV_ISL12022) += rtc-isl12022.o
 obj-$(CONFIG_RTC_DRV_ISL12026) += rtc-isl12026.o
 obj-$(CONFIG_RTC_DRV_ISL1208)  += rtc-isl1208.o

diff --git a/drivers/rtc/rtc-imx-sc.c b/drivers/rtc/rtc-imx-sc.c
new file mode 100644 (file)
index 0000000..7ff0854
--- /dev/null
+++ b/drivers/rtc/rtc-imx-sc.c
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018 NXP.
+ */
+
+#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_TIME         6
+
+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;
+
+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_time_to_tm(msg.time, tm);
+
+       return 0;
+}
+
+static const struct rtc_class_ops imx_sc_rtc_ops = {
+       .read_time = imx_sc_rtc_read_time,
+};
+
+static int imx_sc_rtc_probe(struct platform_device *pdev)
+{
+       int ret;
+
+       ret = imx_scu_get_handle(&rtc_ipc_handle);
+       if (ret)
+               return ret;
+
+       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) {
+               dev_err(&pdev->dev, "failed to register rtc: %d\n", ret);
+               return ret;
+       }
+
+       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");