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