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>lime2-spi
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Texas Instruments TI SCI System Reset Controller |
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================================================ |
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Some TI SoCs contain a system controller (like the SYSFW, etc...) that is |
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responsible for controlling the state of the IPs that are present. |
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Communication between the host processor running an OS and the system |
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controller happens through a protocol known as TI SCI [1]. |
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[1] http://processors.wiki.ti.com/index.php/TISCI |
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System Reset Controller Node |
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============================ |
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The sysreset controller node represents the reset for the overall SoC |
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which is managed by the SYSFW. Because this relies on the TI SCI protocol |
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to communicate with the SYSFW it must be a child of the sysfw node. |
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Required Properties: |
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-------------------- |
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- compatible: Must be "ti,sci-sysreset" |
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Example (AM65x): |
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---------------- |
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sysfw: sysfw { |
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compatible = "ti,am654-system-controller"; |
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... |
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k3_sysreset: sysreset-controller { |
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compatible = "ti,sci-sysreset"; |
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}; |
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}; |
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* Texas Instruments System Control Interface (TI SCI) system reset driver |
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* |
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* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
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* Andreas Dannenberg <dannenberg@ti.com> |
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*/ |
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#include <common.h> |
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#include <dm.h> |
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#include <errno.h> |
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#include <sysreset.h> |
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#include <linux/soc/ti/ti_sci_protocol.h> |
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/**
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* struct ti_sci_sysreset_data - sysreset controller information structure |
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* @sci: TI SCI handle used for communication with system controller |
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*/ |
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struct ti_sci_sysreset_data { |
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const struct ti_sci_handle *sci; |
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}; |
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static int ti_sci_sysreset_probe(struct udevice *dev) |
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{ |
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struct ti_sci_sysreset_data *data = dev_get_priv(dev); |
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debug("%s(dev=%p)\n", __func__, dev); |
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if (!data) |
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return -ENOMEM; |
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/* Store handle for communication with the system controller */ |
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data->sci = ti_sci_get_handle(dev); |
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if (IS_ERR(data->sci)) |
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return PTR_ERR(data->sci); |
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return 0; |
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} |
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static int ti_sci_sysreset_request(struct udevice *dev, enum sysreset_t type) |
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{ |
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struct ti_sci_sysreset_data *data = dev_get_priv(dev); |
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const struct ti_sci_handle *sci = data->sci; |
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const struct ti_sci_core_ops *cops = &sci->ops.core_ops; |
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int ret; |
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debug("%s(dev=%p, type=%d)\n", __func__, dev, type); |
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ret = cops->reboot_device(sci); |
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if (ret) |
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dev_err(rst->dev, "%s: reboot_device failed (%d)\n", |
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__func__, ret); |
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return ret; |
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} |
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static struct sysreset_ops ti_sci_sysreset_ops = { |
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.request = ti_sci_sysreset_request, |
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}; |
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static const struct udevice_id ti_sci_sysreset_of_match[] = { |
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{ .compatible = "ti,sci-sysreset", }, |
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{ /* sentinel */ }, |
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}; |
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U_BOOT_DRIVER(ti_sci_sysreset) = { |
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.name = "ti-sci-sysreset", |
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.id = UCLASS_SYSRESET, |
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.of_match = ti_sci_sysreset_of_match, |
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.probe = ti_sci_sysreset_probe, |
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.priv_auto_alloc_size = sizeof(struct ti_sci_sysreset_data), |
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.ops = &ti_sci_sysreset_ops, |
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}; |
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