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694b052401
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>
74 lines
1.8 KiB
C
74 lines
1.8 KiB
C
// 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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