diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/reset/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/reset/Makefile | 1 | ||||
| -rw-r--r-- | drivers/reset/tegra-car-reset.c | 72 |
3 files changed, 80 insertions, 0 deletions
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index 5b84f21..4fcc0d9 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig @@ -20,6 +20,13 @@ config SANDBOX_RESET simply accepts requests to reset various HW modules without actually doing anything beyond a little error checking. +config TEGRA_CAR_RESET + bool "Enable Tegra CAR-based reset driver" + depends on TEGRA_CAR + help + Enable support for manipulating Tegra's on-SoC reset signals via + direct register access to the Tegra CAR (Clock And Reset controller). + config TEGRA186_RESET bool "Enable Tegra186 BPMP-based reset driver" depends on TEGRA186_BPMP diff --git a/drivers/reset/Makefile b/drivers/reset/Makefile index ff0e090..5d4ea3d 100644 --- a/drivers/reset/Makefile +++ b/drivers/reset/Makefile @@ -5,4 +5,5 @@ obj-$(CONFIG_DM_RESET) += reset-uclass.o obj-$(CONFIG_SANDBOX_MBOX) += sandbox-reset.o obj-$(CONFIG_SANDBOX_MBOX) += sandbox-reset-test.o +obj-$(CONFIG_TEGRA_CAR_RESET) += tegra-car-reset.o obj-$(CONFIG_TEGRA186_RESET) += tegra186-reset.o diff --git a/drivers/reset/tegra-car-reset.c b/drivers/reset/tegra-car-reset.c new file mode 100644 index 0000000..3147a50 --- /dev/null +++ b/drivers/reset/tegra-car-reset.c @@ -0,0 +1,72 @@ +/* + * Copyright (c) 2016, NVIDIA CORPORATION. + * + * SPDX-License-Identifier: GPL-2.0 + */ + +#include <common.h> +#include <dm.h> +#include <reset-uclass.h> +#include <asm/arch/clock.h> +#include <asm/arch-tegra/clk_rst.h> + +static int tegra_car_reset_request(struct reset_ctl *reset_ctl) +{ + debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl, + reset_ctl->dev, reset_ctl->id); + + /* PERIPH_ID_COUNT varies per SoC */ + if (reset_ctl->id >= PERIPH_ID_COUNT) + return -EINVAL; + + return 0; +} + +static int tegra_car_reset_free(struct reset_ctl *reset_ctl) +{ + debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl, + reset_ctl->dev, reset_ctl->id); + + return 0; +} + +static int tegra_car_reset_assert(struct reset_ctl *reset_ctl) +{ + debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl, + reset_ctl->dev, reset_ctl->id); + + reset_set_enable(reset_ctl->id, 1); + + return 0; +} + +static int tegra_car_reset_deassert(struct reset_ctl *reset_ctl) +{ + debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl, + reset_ctl->dev, reset_ctl->id); + + reset_set_enable(reset_ctl->id, 0); + + return 0; +} + +struct reset_ops tegra_car_reset_ops = { + .request = tegra_car_reset_request, + .free = tegra_car_reset_free, + .rst_assert = tegra_car_reset_assert, + .rst_deassert = tegra_car_reset_deassert, +}; + +static int tegra_car_reset_probe(struct udevice *dev) +{ + debug("%s(dev=%p)\n", __func__, dev); + + return 0; +} + +U_BOOT_DRIVER(tegra_car_reset) = { + .name = "tegra_car_reset", + .id = UCLASS_RESET, + .probe = tegra_car_reset_probe, + .ops = &tegra_car_reset_ops, +}; |