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f676eb217b
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>
61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
// 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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