From: Andreas Dannenberg dannenberg@ti.com
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.
Reviewed-by: Tom Rini trini@konsulko.com Signed-off-by: Andreas Dannenberg dannenberg@ti.com Signed-off-by: Lokesh Vutla lokeshvutla@ti.com --- .../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 0000000000..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 0000000000..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 dannenberg@ti.com + */ + +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <sysreset.h> +#include <linux/soc/ti/ti_sci_protocol.h> + +/** + * 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 struct ti_sci_core_ops *cops = &sci->ops.core_ops; + int ret; + + debug("%s(dev=%p, type=%d)\n", __func__, dev, type); + + ret = cops->reboot_device(sci); + if (ret) + dev_err(rst->dev, "%s: reboot_device failed (%d)\n", + __func__, ret); + + return ret; +} + +static struct sysreset_ops ti_sci_sysreset_ops = { + .request = ti_sci_sysreset_request, +}; + +static const struct udevice_id ti_sci_sysreset_of_match[] = { + { .compatible = "ti,sci-sysreset", }, + { /* sentinel */ }, +}; + +U_BOOT_DRIVER(ti_sci_sysreset) = { + .name = "ti-sci-sysreset", + .id = UCLASS_SYSRESET, + .of_match = ti_sci_sysreset_of_match, + .probe = ti_sci_sysreset_probe, + .priv_auto_alloc_size = sizeof(struct ti_sci_sysreset_data), + .ops = &ti_sci_sysreset_ops, +};