From: Andreas Dannenberg
Devices from the TI K3 family of SoCs like the AM654x contain a Device
Management and Security Controller (SYSFW) that manages the low-level
device control (like clocks, resets etc) for the various hardware
modules present on the SoC. These device control operations are provided
to the host processor OS through a communication protocol called the TI
System Control Interface (TI SCI) protocol.
This patch adds a system reset driver that communicates to the system
controller over the TI SCI protocol for allowing to perform a system-
wide SoC reset.
Signed-off-by: Andreas Dannenberg
Signed-off-by: Lokesh Vutla
---
.../sysreset/ti,sci-sysreset.txt | 29
drivers/sysreset/Kconfig | 7 ++
drivers/sysreset/Makefile | 1 +
drivers/sysreset/sysreset-ti-sci.c| 73 +++
4 files changed, 110 insertions(+)
create mode 100644 doc/device-tree-bindings/sysreset/ti,sci-sysreset.txt
create mode 100644 drivers/sysreset/sysreset-ti-sci.c
diff --git a/doc/device-tree-bindings/sysreset/ti,sci-sysreset.txt
b/doc/device-tree-bindings/sysreset/ti,sci-sysreset.txt
new file mode 100644
index 00..02704c6487
--- /dev/null
+++ b/doc/device-tree-bindings/sysreset/ti,sci-sysreset.txt
@@ -0,0 +1,29 @@
+Texas Instruments TI SCI System Reset Controller
+
+
+Some TI SoCs contain a system controller (like the SYSFW, etc...) that is
+responsible for controlling the state of the IPs that are present.
+Communication between the host processor running an OS and the system
+controller happens through a protocol known as TI SCI [1].
+
+[1] http://processors.wiki.ti.com/index.php/TISCI
+
+System Reset Controller Node
+
+The sysreset controller node represents the reset for the overall SoC
+which is managed by the SYSFW. Because this relies on the TI SCI protocol
+to communicate with the SYSFW it must be a child of the sysfw node.
+
+Required Properties:
+
+ - compatible: Must be "ti,sci-sysreset"
+
+Example (AM65x):
+
+ sysfw: sysfw {
+ compatible = "ti,am654-system-controller";
+ ...
+ k3_sysreset: sysreset-controller {
+ compatible = "ti,sci-sysreset";
+ };
+ };
diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig
index 9b2fda4d25..ed1d437fb0 100644
--- a/drivers/sysreset/Kconfig
+++ b/drivers/sysreset/Kconfig
@@ -36,6 +36,13 @@ config SYSRESET_PSCI
Enable PSCI SYSTEM_RESET function call. To use this, PSCI firmware
must be running on your system.
+config SYSRESET_TI_SCI
+ bool "TI System Control Interface (TI SCI) system reset driver"
+ depends on TI_SCI_PROTOCOL
+ help
+ This enables the system reset driver support over TI System Control
+ Interface available on some new TI's SoCs.
+
endif
config SYSRESET_SYSCON
diff --git a/drivers/sysreset/Makefile b/drivers/sysreset/Makefile
index 707f1d7469..02ee1df6b0 100644
--- a/drivers/sysreset/Makefile
+++ b/drivers/sysreset/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_SYSRESET) += sysreset-uclass.o
obj-$(CONFIG_SYSRESET_GPIO) += sysreset_gpio.o
obj-$(CONFIG_SYSRESET_MICROBLAZE) += sysreset_microblaze.o
obj-$(CONFIG_SYSRESET_PSCI) += sysreset_psci.o
+obj-$(CONFIG_SYSRESET_TI_SCI) += sysreset-ti-sci.o
obj-$(CONFIG_SYSRESET_SYSCON) += sysreset_syscon.o
obj-$(CONFIG_SYSRESET_WATCHDOG) += sysreset_watchdog.o
obj-$(CONFIG_SYSRESET_X86) += sysreset_x86.o
diff --git a/drivers/sysreset/sysreset-ti-sci.c
b/drivers/sysreset/sysreset-ti-sci.c
new file mode 100644
index 00..890a607c4b
--- /dev/null
+++ b/drivers/sysreset/sysreset-ti-sci.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Texas Instruments System Control Interface (TI SCI) system reset driver
+ *
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ * Andreas Dannenberg
+ */
+
+#include
+#include
+#include
+#include
+#include
+
+/**
+ * struct ti_sci_sysreset_data - sysreset controller information structure
+ * @sci: TI SCI handle used for communication with system controller
+ */
+struct ti_sci_sysreset_data {
+ const struct ti_sci_handle *sci;
+};
+
+static int ti_sci_sysreset_probe(struct udevice *dev)
+{
+ struct ti_sci_sysreset_data *data = dev_get_priv(dev);
+
+ debug("%s(dev=%p)\n", __func__, dev);
+
+ if (!data)
+ return -ENOMEM;
+
+ /* Store handle for communication with the system controller */
+ data->sci = ti_sci_get_handle(dev);
+ if (IS_ERR(data->sci))
+ return PTR_ERR(data->sci);
+
+ return 0;
+}
+
+static int ti_sci_sysreset_request(struct udevice *dev, enum sysreset_t type)
+{
+ struct ti_sci_sysreset_data *data = dev_get_priv(dev);
+ const struct ti_sci_handle *sci = data->sci;
+ const
