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https://github.com/brain-hackers/u-boot-brain
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fe60f06dcd
Implement a reset uclass driver for the Tegra CAR. This allows clients to use standard reset APIs on Tegra. This device is intended to be instantiated by the core Tegra CAR driver, rather than being instantiated directly from DT. The implementation uses the existing custom Tegra- specific reset APIs to avoid coupling the series with significant refactoring of the existing Tegra clock/reset code. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Tom Warren <twarren@nvidia.com>
73 lines
1.6 KiB
C
73 lines
1.6 KiB
C
/*
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* Copyright (c) 2016, NVIDIA CORPORATION.
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*
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* SPDX-License-Identifier: GPL-2.0
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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/clock.h>
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#include <asm/arch-tegra/clk_rst.h>
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static int tegra_car_reset_request(struct reset_ctl *reset_ctl)
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{
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debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
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reset_ctl->dev, reset_ctl->id);
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/* PERIPH_ID_COUNT varies per SoC */
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if (reset_ctl->id >= PERIPH_ID_COUNT)
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return -EINVAL;
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return 0;
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}
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static int tegra_car_reset_free(struct reset_ctl *reset_ctl)
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{
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debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
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reset_ctl->dev, reset_ctl->id);
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return 0;
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}
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static int tegra_car_reset_assert(struct reset_ctl *reset_ctl)
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{
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debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
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reset_ctl->dev, reset_ctl->id);
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reset_set_enable(reset_ctl->id, 1);
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return 0;
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}
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static int tegra_car_reset_deassert(struct reset_ctl *reset_ctl)
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{
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debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl,
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reset_ctl->dev, reset_ctl->id);
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reset_set_enable(reset_ctl->id, 0);
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return 0;
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}
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struct reset_ops tegra_car_reset_ops = {
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.request = tegra_car_reset_request,
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.free = tegra_car_reset_free,
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.rst_assert = tegra_car_reset_assert,
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.rst_deassert = tegra_car_reset_deassert,
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};
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static int tegra_car_reset_probe(struct udevice *dev)
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{
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debug("%s(dev=%p)\n", __func__, dev);
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return 0;
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}
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U_BOOT_DRIVER(tegra_car_reset) = {
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.name = "tegra_car_reset",
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.id = UCLASS_RESET,
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.probe = tegra_car_reset_probe,
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.ops = &tegra_car_reset_ops,
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};
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