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https://github.com/brain-hackers/u-boot-brain
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reset: Add Raspberry Pi 4 firmware reset controller
Raspberry Pi 4's co-processor controls some of the board's HW initialization process, but it's up to Linux to trigger it when relevant. Introduce a reset controller capable of interfacing with RPi4's co-processor that models these firmware initialization routines as reset lines. Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Signed-off-by: Matthias Brugger <mbrugger@suse.com>
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@ -153,4 +153,15 @@ config RESET_SYSCON
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depends on DM_RESET
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depends on DM_RESET
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help
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help
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Support generic syscon mapped register reset devices.
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Support generic syscon mapped register reset devices.
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config RESET_RASPBERRYPI
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bool "Raspberry Pi 4 Firmware Reset Controller Driver"
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depends on DM_RESET && ARCH_BCM283X
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default USB_XHCI_PCI
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help
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Raspberry Pi 4's co-processor controls some of the board's HW
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initialization process, but it's up to Linux to trigger it when
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relevant. This driver provides a reset controller capable of
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interfacing with RPi4's co-processor and model these firmware
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initialization routines as reset lines.
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endmenu
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endmenu
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@ -24,3 +24,4 @@ obj-$(CONFIG_RESET_SUNXI) += reset-sunxi.o
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obj-$(CONFIG_RESET_HISILICON) += reset-hisilicon.o
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obj-$(CONFIG_RESET_HISILICON) += reset-hisilicon.o
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obj-$(CONFIG_RESET_IMX7) += reset-imx7.o
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obj-$(CONFIG_RESET_IMX7) += reset-imx7.o
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obj-$(CONFIG_RESET_SYSCON) += reset-syscon.o
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obj-$(CONFIG_RESET_SYSCON) += reset-syscon.o
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obj-$(CONFIG_RESET_RASPBERRYPI) += reset-raspberrypi.o
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60
drivers/reset/reset-raspberrypi.c
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60
drivers/reset/reset-raspberrypi.c
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@ -0,0 +1,60 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Raspberry Pi 4 firmware reset driver
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*
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* Copyright (C) 2020 Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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*/
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#include <common.h>
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#include <dm.h>
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#include <reset-uclass.h>
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#include <asm/arch/msg.h>
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#include <dt-bindings/reset/raspberrypi,firmware-reset.h>
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static int raspberrypi_reset_request(struct reset_ctl *reset_ctl)
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{
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if (reset_ctl->id >= RASPBERRYPI_FIRMWARE_RESET_NUM_IDS)
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return -EINVAL;
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return 0;
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}
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static int raspberrypi_reset_free(struct reset_ctl *reset_ctl)
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{
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return 0;
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}
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static int raspberrypi_reset_assert(struct reset_ctl *reset_ctl)
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{
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switch (reset_ctl->id) {
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case RASPBERRYPI_FIRMWARE_RESET_ID_USB:
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bcm2711_notify_vl805_reset();
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return 0;
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default:
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return -EINVAL;
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}
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}
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static int raspberrypi_reset_deassert(struct reset_ctl *reset_ctl)
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{
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return 0;
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}
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struct reset_ops raspberrypi_reset_ops = {
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.request = raspberrypi_reset_request,
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.rfree = raspberrypi_reset_free,
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.rst_assert = raspberrypi_reset_assert,
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.rst_deassert = raspberrypi_reset_deassert,
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};
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static const struct udevice_id raspberrypi_reset_ids[] = {
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{ .compatible = "raspberrypi,firmware-reset" },
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{ }
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};
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U_BOOT_DRIVER(raspberrypi_reset) = {
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.name = "raspberrypi-reset",
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.id = UCLASS_RESET,
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.of_match = raspberrypi_reset_ids,
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.ops = &raspberrypi_reset_ops,
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};
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13
include/dt-bindings/reset/raspberrypi,firmware-reset.h
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13
include/dt-bindings/reset/raspberrypi,firmware-reset.h
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@ -0,0 +1,13 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (c) 2020 Nicolas Saenz Julienne
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* Author: Nicolas Saenz Julienne <nsaenzjulienne@suse.com>
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*/
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#ifndef _DT_BINDINGS_RASPBERRYPI_FIRMWARE_RESET_H
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#define _DT_BINDINGS_RASPBERRYPI_FIRMWARE_RESET_H
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#define RASPBERRYPI_FIRMWARE_RESET_ID_USB 0
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#define RASPBERRYPI_FIRMWARE_RESET_NUM_IDS 1
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#endif
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