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- // SPDX-License-Identifier: GPL-2.0-only
- /*
- * Copyright (c) 2014 MediaTek Inc.
- */
- #include <linux/mfd/syscon.h>
- #include <linux/module.h>
- #include <linux/of.h>
- #include <linux/platform_device.h>
- #include <linux/regmap.h>
- #include <linux/reset-controller.h>
- #include <linux/slab.h>
- #include "clk-mtk.h"
- struct mtk_reset {
- struct regmap *regmap;
- int regofs;
- struct reset_controller_dev rcdev;
- };
- static int mtk_reset_assert_set_clr(struct reset_controller_dev *rcdev,
- unsigned long id)
- {
- struct mtk_reset *data = container_of(rcdev, struct mtk_reset, rcdev);
- unsigned int reg = data->regofs + ((id / 32) << 4);
- return regmap_write(data->regmap, reg, 1);
- }
- static int mtk_reset_deassert_set_clr(struct reset_controller_dev *rcdev,
- unsigned long id)
- {
- struct mtk_reset *data = container_of(rcdev, struct mtk_reset, rcdev);
- unsigned int reg = data->regofs + ((id / 32) << 4) + 0x4;
- return regmap_write(data->regmap, reg, 1);
- }
- static int mtk_reset_assert(struct reset_controller_dev *rcdev,
- unsigned long id)
- {
- struct mtk_reset *data = container_of(rcdev, struct mtk_reset, rcdev);
- return regmap_update_bits(data->regmap, data->regofs + ((id / 32) << 2),
- BIT(id % 32), ~0);
- }
- static int mtk_reset_deassert(struct reset_controller_dev *rcdev,
- unsigned long id)
- {
- struct mtk_reset *data = container_of(rcdev, struct mtk_reset, rcdev);
- return regmap_update_bits(data->regmap, data->regofs + ((id / 32) << 2),
- BIT(id % 32), 0);
- }
- static int mtk_reset(struct reset_controller_dev *rcdev,
- unsigned long id)
- {
- int ret;
- ret = mtk_reset_assert(rcdev, id);
- if (ret)
- return ret;
- return mtk_reset_deassert(rcdev, id);
- }
- static int mtk_reset_set_clr(struct reset_controller_dev *rcdev,
- unsigned long id)
- {
- int ret;
- ret = mtk_reset_assert_set_clr(rcdev, id);
- if (ret)
- return ret;
- return mtk_reset_deassert_set_clr(rcdev, id);
- }
- static const struct reset_control_ops mtk_reset_ops = {
- .assert = mtk_reset_assert,
- .deassert = mtk_reset_deassert,
- .reset = mtk_reset,
- };
- static const struct reset_control_ops mtk_reset_ops_set_clr = {
- .assert = mtk_reset_assert_set_clr,
- .deassert = mtk_reset_deassert_set_clr,
- .reset = mtk_reset_set_clr,
- };
- static void mtk_register_reset_controller_common(struct device_node *np,
- unsigned int num_regs, int regofs,
- const struct reset_control_ops *reset_ops)
- {
- struct mtk_reset *data;
- int ret;
- struct regmap *regmap;
- regmap = syscon_node_to_regmap(np);
- if (IS_ERR(regmap)) {
- pr_err("Cannot find regmap for %pOF: %ld\n", np,
- PTR_ERR(regmap));
- return;
- }
- data = kzalloc(sizeof(*data), GFP_KERNEL);
- if (!data)
- return;
- data->regmap = regmap;
- data->regofs = regofs;
- data->rcdev.owner = THIS_MODULE;
- data->rcdev.nr_resets = num_regs * 32;
- data->rcdev.ops = reset_ops;
- data->rcdev.of_node = np;
- ret = reset_controller_register(&data->rcdev);
- if (ret) {
- pr_err("could not register reset controller: %d\n", ret);
- kfree(data);
- return;
- }
- }
- void mtk_register_reset_controller(struct device_node *np,
- unsigned int num_regs, int regofs)
- {
- mtk_register_reset_controller_common(np, num_regs, regofs,
- &mtk_reset_ops);
- }
- void mtk_register_reset_controller_set_clr(struct device_node *np,
- unsigned int num_regs, int regofs)
- {
- mtk_register_reset_controller_common(np, num_regs, regofs,
- &mtk_reset_ops_set_clr);
- }
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