mirror of
https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
89 lines
2 KiB
C
89 lines
2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Amlogic Meson Reset Controller driver
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*
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* Copyright (c) 2018 BayLibre, SAS.
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* Author: Neil Armstrong <narmstrong@baylibre.com>
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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 <regmap.h>
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#define REG_COUNT 8
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#define BITS_PER_REG 32
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#define LEVEL_OFFSET 0x7c
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struct meson_reset_priv {
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struct regmap *regmap;
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};
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static int meson_reset_request(struct reset_ctl *reset_ctl)
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{
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if (reset_ctl->id > (REG_COUNT * BITS_PER_REG))
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return -EINVAL;
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return 0;
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}
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static int meson_reset_free(struct reset_ctl *reset_ctl)
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{
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return 0;
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}
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static int meson_reset_level(struct reset_ctl *reset_ctl, bool assert)
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{
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struct meson_reset_priv *priv = dev_get_priv(reset_ctl->dev);
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uint bank = reset_ctl->id / BITS_PER_REG;
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uint offset = reset_ctl->id % BITS_PER_REG;
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uint reg_offset = LEVEL_OFFSET + (bank << 2);
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uint val;
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regmap_read(priv->regmap, reg_offset, &val);
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if (assert)
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val &= ~BIT(offset);
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else
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val |= BIT(offset);
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regmap_write(priv->regmap, reg_offset, val);
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return 0;
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}
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static int meson_reset_assert(struct reset_ctl *reset_ctl)
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{
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return meson_reset_level(reset_ctl, true);
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}
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static int meson_reset_deassert(struct reset_ctl *reset_ctl)
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{
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return meson_reset_level(reset_ctl, false);
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}
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struct reset_ops meson_reset_ops = {
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.request = meson_reset_request,
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.free = meson_reset_free,
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.rst_assert = meson_reset_assert,
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.rst_deassert = meson_reset_deassert,
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};
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static const struct udevice_id meson_reset_ids[] = {
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{ .compatible = "amlogic,meson-gxbb-reset" },
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{ }
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};
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static int meson_reset_probe(struct udevice *dev)
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{
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struct meson_reset_priv *priv = dev_get_priv(dev);
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return regmap_init_mem(dev, &priv->regmap);
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}
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U_BOOT_DRIVER(meson_reset) = {
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.name = "meson_reset",
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.id = UCLASS_RESET,
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.of_match = meson_reset_ids,
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.probe = meson_reset_probe,
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.ops = &meson_reset_ops,
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.priv_auto_alloc_size = sizeof(struct meson_reset_priv),
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};
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