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@@ -0,0 +1,81 @@
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+// SPDX-License-Identifier: GPL-2.0
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+/*
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+ * Copyright (C) 2020 Sean Anderson
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+ */
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+
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+#include <common.h>
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+#include <dm.h>
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+#include <regmap.h>
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+#include <reset.h>
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+#include <reset-uclass.h>
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+#include <syscon.h>
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+#include <linux/bitops.h>
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+#include <linux/err.h>
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+
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+struct syscon_reset_priv {
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+ struct regmap *regmap;
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+ uint offset;
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+ uint mask;
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+ bool assert_high;
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+};
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+
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+static int syscon_reset_request(struct reset_ctl *rst)
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+{
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+ struct syscon_reset_priv *priv = dev_get_priv(rst->dev);
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+
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+ if (BIT(rst->id) & priv->mask)
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+ return 0;
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+ else
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+ return -EINVAL;
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+}
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+
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+static int syscon_reset_assert(struct reset_ctl *rst)
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+{
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+ struct syscon_reset_priv *priv = dev_get_priv(rst->dev);
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+
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+ return regmap_update_bits(priv->regmap, priv->offset, BIT(rst->id),
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+ priv->assert_high ? BIT(rst->id) : 0);
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+}
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+
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+static int syscon_reset_deassert(struct reset_ctl *rst)
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+{
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+ struct syscon_reset_priv *priv = dev_get_priv(rst->dev);
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+
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+ return regmap_update_bits(priv->regmap, priv->offset, BIT(rst->id),
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+ priv->assert_high ? 0 : BIT(rst->id));
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+}
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+
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+static const struct reset_ops syscon_reset_ops = {
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+ .request = syscon_reset_request,
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+ .rst_assert = syscon_reset_assert,
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+ .rst_deassert = syscon_reset_deassert,
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+};
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+
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+int syscon_reset_probe(struct udevice *dev)
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+{
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+ struct syscon_reset_priv *priv = dev_get_priv(dev);
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+
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+ priv->regmap = syscon_regmap_lookup_by_phandle(dev, "regmap");
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+ if (IS_ERR(priv->regmap))
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+ return -ENODEV;
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+
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+ priv->offset = dev_read_u32_default(dev, "offset", 0);
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+ priv->mask = dev_read_u32_default(dev, "mask", 0);
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+ priv->assert_high = dev_read_u32_default(dev, "assert-high", true);
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+
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+ return 0;
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+}
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+
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+static const struct udevice_id syscon_reset_ids[] = {
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+ { .compatible = "syscon-reset" },
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+ { },
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+};
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+
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+U_BOOT_DRIVER(syscon_reset) = {
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+ .name = "syscon_reset",
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+ .id = UCLASS_RESET,
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+ .of_match = syscon_reset_ids,
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+ .probe = syscon_reset_probe,
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+ .priv_auto_alloc_size = sizeof(struct syscon_reset_priv),
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+ .ops = &syscon_reset_ops,
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+};
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