diff options
| author | Nicolas Saenz Julienne | 2020-06-29 18:37:23 +0200 |
|---|---|---|
| committer | Matthias Brugger | 2020-07-10 11:49:28 +0200 |
| commit | f676eb217bdff3bd734a42c8f9bbc58c9100055c (patch) | |
| tree | 584bcadc09aa5b2fbb27f5f432401fd9bc1b9ad4 /drivers/reset/reset-raspberrypi.c | |
| parent | d774da08dcd6277d4b24092ccde9ba536504a7a8 (diff) | |
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>
Diffstat (limited to 'drivers/reset/reset-raspberrypi.c')
| -rw-r--r-- | drivers/reset/reset-raspberrypi.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/drivers/reset/reset-raspberrypi.c b/drivers/reset/reset-raspberrypi.c new file mode 100644 index 00000000000..e2d284e5aca --- /dev/null +++ b/drivers/reset/reset-raspberrypi.c @@ -0,0 +1,60 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Raspberry Pi 4 firmware reset driver + * + * Copyright (C) 2020 Nicolas Saenz Julienne <nsaenzjulienne@suse.de> + */ +#include <common.h> +#include <dm.h> +#include <reset-uclass.h> +#include <asm/arch/msg.h> +#include <dt-bindings/reset/raspberrypi,firmware-reset.h> + +static int raspberrypi_reset_request(struct reset_ctl *reset_ctl) +{ + if (reset_ctl->id >= RASPBERRYPI_FIRMWARE_RESET_NUM_IDS) + return -EINVAL; + + return 0; +} + +static int raspberrypi_reset_free(struct reset_ctl *reset_ctl) +{ + return 0; +} + +static int raspberrypi_reset_assert(struct reset_ctl *reset_ctl) +{ + switch (reset_ctl->id) { + case RASPBERRYPI_FIRMWARE_RESET_ID_USB: + bcm2711_notify_vl805_reset(); + return 0; + default: + return -EINVAL; + } +} + +static int raspberrypi_reset_deassert(struct reset_ctl *reset_ctl) +{ + return 0; +} + +struct reset_ops raspberrypi_reset_ops = { + .request = raspberrypi_reset_request, + .rfree = raspberrypi_reset_free, + .rst_assert = raspberrypi_reset_assert, + .rst_deassert = raspberrypi_reset_deassert, +}; + +static const struct udevice_id raspberrypi_reset_ids[] = { + { .compatible = "raspberrypi,firmware-reset" }, + { } +}; + +U_BOOT_DRIVER(raspberrypi_reset) = { + .name = "raspberrypi-reset", + .id = UCLASS_RESET, + .of_match = raspberrypi_reset_ids, + .ops = &raspberrypi_reset_ops, +}; + |