mirror of
https://github.com/brain-hackers/u-boot-brain
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45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0 or later
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/*
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* Copyright (C) 2020 Socionext Inc.
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* Author: Masahiro Yamada <yamada.masahiro@socionext.com>
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*/
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#include <log.h>
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#include <linux/errno.h>
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#include <dm.h>
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#include <dm/uclass-internal.h>
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#include <reset.h>
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#include "init.h"
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/*
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* Assert the Denali NAND controller reset if found.
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*
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* On LD4, the bootstrap process starts running after power-on reset regardless
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* of the boot mode, here the pin-mux is not necessarily set up for NAND, then
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* the controller is stuck. Assert the controller reset here, and should be
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* deasserted in the driver after the pin-mux is correctly handled. For other
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* SoCs, the bootstrap runs only when the boot mode selects ONFi, but it is yet
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* effective when the boot swap is on. So, the reset should be asserted anyway.
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*/
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void uniphier_nand_reset_assert(void)
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{
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struct udevice *dev;
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struct reset_ctl_bulk resets;
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int ret;
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ret = uclass_find_first_device(UCLASS_MTD, &dev);
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if (ret || !dev)
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return;
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/* make sure this is the Denali NAND controller */
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if (strcmp(dev->driver->name, "denali-nand-dt"))
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return;
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ret = reset_get_bulk(dev, &resets);
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if (ret)
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return;
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reset_assert_bulk(&resets);
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}
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