From 694b05240161eecc9628d5816fbf3d37f3c32e2d Mon Sep 17 00:00:00 2001 From: Andreas Dannenberg Date: Mon, 27 Aug 2018 15:57:46 +0530 Subject: sysreset: Add TI System Control Interface (TI SCI) sysreset driver 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 Signed-off-by: Andreas Dannenberg Signed-off-by: Lokesh Vutla --- drivers/sysreset/sysreset-ti-sci.c | 73 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+) create mode 100644 drivers/sysreset/sysreset-ti-sci.c (limited to 'drivers/sysreset/sysreset-ti-sci.c') diff --git a/drivers/sysreset/sysreset-ti-sci.c b/drivers/sysreset/sysreset-ti-sci.c new file mode 100644 index 00000000000..890a607c4b1 --- /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 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, +}; -- cgit v1.2.3