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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (C) 2020 Sean Anderson
- */
- #include <common.h>
- #include <dm.h>
- #include <regmap.h>
- #include <reset.h>
- #include <reset-uclass.h>
- #include <syscon.h>
- #include <linux/bitops.h>
- #include <linux/err.h>
- struct syscon_reset_priv {
- struct regmap *regmap;
- uint offset;
- uint mask;
- bool assert_high;
- };
- static int syscon_reset_request(struct reset_ctl *rst)
- {
- struct syscon_reset_priv *priv = dev_get_priv(rst->dev);
- if (BIT(rst->id) & priv->mask)
- return 0;
- else
- return -EINVAL;
- }
- static int syscon_reset_assert(struct reset_ctl *rst)
- {
- struct syscon_reset_priv *priv = dev_get_priv(rst->dev);
- return regmap_update_bits(priv->regmap, priv->offset, BIT(rst->id),
- priv->assert_high ? BIT(rst->id) : 0);
- }
- static int syscon_reset_deassert(struct reset_ctl *rst)
- {
- struct syscon_reset_priv *priv = dev_get_priv(rst->dev);
- return regmap_update_bits(priv->regmap, priv->offset, BIT(rst->id),
- priv->assert_high ? 0 : BIT(rst->id));
- }
- static const struct reset_ops syscon_reset_ops = {
- .request = syscon_reset_request,
- .rst_assert = syscon_reset_assert,
- .rst_deassert = syscon_reset_deassert,
- };
- int syscon_reset_probe(struct udevice *dev)
- {
- struct syscon_reset_priv *priv = dev_get_priv(dev);
- priv->regmap = syscon_regmap_lookup_by_phandle(dev, "regmap");
- if (IS_ERR(priv->regmap))
- return -ENODEV;
- priv->offset = dev_read_u32_default(dev, "offset", 0);
- priv->mask = dev_read_u32_default(dev, "mask", 0);
- priv->assert_high = dev_read_u32_default(dev, "assert-high", true);
- return 0;
- }
- static const struct udevice_id syscon_reset_ids[] = {
- { .compatible = "syscon-reset" },
- { },
- };
- U_BOOT_DRIVER(syscon_reset) = {
- .name = "syscon_reset",
- .id = UCLASS_RESET,
- .of_match = syscon_reset_ids,
- .probe = syscon_reset_probe,
- .priv_auto = sizeof(struct syscon_reset_priv),
- .ops = &syscon_reset_ops,
- };
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