4dd99d140c
In Tegra186, on-SoC reset signals are manipulated using IPC requests to the BPMP (Boot and Power Management Processor). This change implements a driver that does that. It is unconditionally selected by CONFIG_TEGRA186 since virtually any Tegra186 build of U-Boot will need the feature. Signed-off-by: Stephen Warren <swarren@nvidia.com> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Tom Warren <twarren@nvidia.com>
82 lines
1.8 KiB
C
82 lines
1.8 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 <misc.h>
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#include <reset-uclass.h>
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#include <asm/arch-tegra/bpmp_abi.h>
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static int tegra186_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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return 0;
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}
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static int tegra186_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 tegra186_reset_common(struct reset_ctl *reset_ctl,
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enum mrq_reset_commands cmd)
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{
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struct mrq_reset_request req;
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int ret;
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req.cmd = cmd;
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req.reset_id = reset_ctl->id;
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ret = misc_call(reset_ctl->dev->parent, MRQ_RESET, &req, sizeof(req),
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NULL, 0);
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if (ret < 0)
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return ret;
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return 0;
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}
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static int tegra186_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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return tegra186_reset_common(reset_ctl, CMD_RESET_ASSERT);
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}
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static int tegra186_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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return tegra186_reset_common(reset_ctl, CMD_RESET_DEASSERT);
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}
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struct reset_ops tegra186_reset_ops = {
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.request = tegra186_reset_request,
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.free = tegra186_reset_free,
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.rst_assert = tegra186_reset_assert,
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.rst_deassert = tegra186_reset_deassert,
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};
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static int tegra186_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(tegra186_reset) = {
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.name = "tegra186_reset",
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.id = UCLASS_RESET,
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.probe = tegra186_reset_probe,
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.ops = &tegra186_reset_ops,
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};
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