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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright (C) 2020 Sifive, Inc.
- * Author: Sagar Kadam <sagar.kadam@sifive.com>
- */
- #include <common.h>
- #include <dm.h>
- #include <reset-uclass.h>
- #include <asm/io.h>
- #include <dm/device_compat.h>
- #include <dm/device-internal.h>
- #include <dm/lists.h>
- #include <linux/bitops.h>
- #define PRCI_RESETREG_OFFSET 0x28
- struct sifive_reset_priv {
- void *base;
- /* number of reset signals */
- int nr_reset;
- };
- static int sifive_rst_trigger(struct reset_ctl *rst, bool level)
- {
- struct sifive_reset_priv *priv = dev_get_priv(rst->dev);
- int id = rst->id;
- int regval = readl(priv->base + PRCI_RESETREG_OFFSET);
- /* Derive bitposition from rst id */
- if (level)
- /* Reset deassert */
- regval |= BIT(id);
- else
- /* Reset assert */
- regval &= ~BIT(id);
- writel(regval, priv->base + PRCI_RESETREG_OFFSET);
- return 0;
- }
- static int sifive_reset_assert(struct reset_ctl *rst)
- {
- return sifive_rst_trigger(rst, false);
- }
- static int sifive_reset_deassert(struct reset_ctl *rst)
- {
- return sifive_rst_trigger(rst, true);
- }
- static int sifive_reset_request(struct reset_ctl *rst)
- {
- struct sifive_reset_priv *priv = dev_get_priv(rst->dev);
- debug("%s(rst=%p) (dev=%p, id=%lu) (nr_reset=%d)\n", __func__,
- rst, rst->dev, rst->id, priv->nr_reset);
- if (rst->id > priv->nr_reset)
- return -EINVAL;
- return 0;
- }
- static int sifive_reset_free(struct reset_ctl *rst)
- {
- struct sifive_reset_priv *priv = dev_get_priv(rst->dev);
- debug("%s(rst=%p) (dev=%p, id=%lu) (nr_reset=%d)\n", __func__,
- rst, rst->dev, rst->id, priv->nr_reset);
- return 0;
- }
- static int sifive_reset_probe(struct udevice *dev)
- {
- struct sifive_reset_priv *priv = dev_get_priv(dev);
- priv->base = dev_remap_addr(dev);
- if (!priv->base)
- return -ENOMEM;
- return 0;
- }
- int sifive_reset_bind(struct udevice *dev, ulong count)
- {
- struct udevice *rst_dev;
- struct sifive_reset_priv *priv;
- int ret;
- ret = device_bind_driver_to_node(dev, "sifive-reset", "reset",
- dev_ofnode(dev), &rst_dev);
- if (ret) {
- dev_err(dev, "failed to bind sifive_reset driver (ret=%d)\n", ret);
- return ret;
- }
- priv = malloc(sizeof(struct sifive_reset_priv));
- priv->nr_reset = count;
- dev_set_priv(rst_dev, priv);
- return 0;
- }
- const struct reset_ops sifive_reset_ops = {
- .request = sifive_reset_request,
- .rfree = sifive_reset_free,
- .rst_assert = sifive_reset_assert,
- .rst_deassert = sifive_reset_deassert,
- };
- U_BOOT_DRIVER(sifive_reset) = {
- .name = "sifive-reset",
- .id = UCLASS_RESET,
- .ops = &sifive_reset_ops,
- .probe = sifive_reset_probe,
- .priv_auto = sizeof(struct sifive_reset_priv),
- };
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