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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (C) 2018 MediaTek Inc.
- *
- * Author: Ryder Lee <ryder.lee@mediatek.com>
- * Weijie Gao <weijie.gao@mediatek.com>
- */
- #include <common.h>
- #include <dm.h>
- #include <log.h>
- #include <malloc.h>
- #include <dm/lists.h>
- #include <regmap.h>
- #include <reset-uclass.h>
- #include <syscon.h>
- #include <dm/device-internal.h>
- #include <linux/bitops.h>
- #include <linux/err.h>
- struct mediatek_reset_priv {
- struct regmap *regmap;
- u32 regofs;
- u32 nr_resets;
- };
- static int mediatek_reset_request(struct reset_ctl *reset_ctl)
- {
- return 0;
- }
- static int mediatek_reset_free(struct reset_ctl *reset_ctl)
- {
- return 0;
- }
- static int mediatek_reset_assert(struct reset_ctl *reset_ctl)
- {
- struct mediatek_reset_priv *priv = dev_get_priv(reset_ctl->dev);
- int id = reset_ctl->id;
- if (id >= priv->nr_resets)
- return -EINVAL;
- return regmap_update_bits(priv->regmap,
- priv->regofs + ((id / 32) << 2), BIT(id % 32), BIT(id % 32));
- }
- static int mediatek_reset_deassert(struct reset_ctl *reset_ctl)
- {
- struct mediatek_reset_priv *priv = dev_get_priv(reset_ctl->dev);
- int id = reset_ctl->id;
- if (id >= priv->nr_resets)
- return -EINVAL;
- return regmap_update_bits(priv->regmap,
- priv->regofs + ((id / 32) << 2), BIT(id % 32), 0);
- }
- struct reset_ops mediatek_reset_ops = {
- .request = mediatek_reset_request,
- .rfree = mediatek_reset_free,
- .rst_assert = mediatek_reset_assert,
- .rst_deassert = mediatek_reset_deassert,
- };
- static int mediatek_reset_probe(struct udevice *dev)
- {
- struct mediatek_reset_priv *priv = dev_get_priv(dev);
- if (!priv->regofs && !priv->nr_resets)
- return -EINVAL;
- priv->regmap = syscon_node_to_regmap(dev_ofnode(dev));
- if (IS_ERR(priv->regmap))
- return PTR_ERR(priv->regmap);
- return 0;
- }
- int mediatek_reset_bind(struct udevice *pdev, u32 regofs, u32 num_regs)
- {
- struct udevice *rst_dev;
- struct mediatek_reset_priv *priv;
- int ret;
- ret = device_bind_driver_to_node(pdev, "mediatek_reset", "reset",
- dev_ofnode(pdev), &rst_dev);
- if (ret)
- return ret;
- priv = malloc(sizeof(struct mediatek_reset_priv));
- priv->regofs = regofs;
- priv->nr_resets = num_regs * 32;
- dev_set_priv(rst_dev, priv);
- return 0;
- }
- U_BOOT_DRIVER(mediatek_reset) = {
- .name = "mediatek_reset",
- .id = UCLASS_RESET,
- .probe = mediatek_reset_probe,
- .ops = &mediatek_reset_ops,
- .priv_auto = sizeof(struct mediatek_reset_priv),
- };
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