1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2014 MediaTek Inc.
6 #include <linux/mfd/syscon.h>
7 #include <linux/module.h>
9 #include <linux/platform_device.h>
10 #include <linux/regmap.h>
11 #include <linux/slab.h>
15 static inline struct mtk_clk_rst_data *to_mtk_clk_rst_data(struct reset_controller_dev *rcdev)
17 return container_of(rcdev, struct mtk_clk_rst_data, rcdev);
20 static int mtk_reset_update(struct reset_controller_dev *rcdev,
21 unsigned long id, bool deassert)
23 struct mtk_clk_rst_data *data = to_mtk_clk_rst_data(rcdev);
24 unsigned int val = deassert ? 0 : ~0;
26 return regmap_update_bits(data->regmap,
27 data->desc->rst_bank_ofs[id / RST_NR_PER_BANK],
28 BIT(id % RST_NR_PER_BANK), val);
31 static int mtk_reset_assert(struct reset_controller_dev *rcdev,
34 return mtk_reset_update(rcdev, id, false);
37 static int mtk_reset_deassert(struct reset_controller_dev *rcdev,
40 return mtk_reset_update(rcdev, id, true);
43 static int mtk_reset(struct reset_controller_dev *rcdev, unsigned long id)
47 ret = mtk_reset_assert(rcdev, id);
51 return mtk_reset_deassert(rcdev, id);
54 static int mtk_reset_update_set_clr(struct reset_controller_dev *rcdev,
55 unsigned long id, bool deassert)
57 struct mtk_clk_rst_data *data = to_mtk_clk_rst_data(rcdev);
58 unsigned int deassert_ofs = deassert ? 0x4 : 0;
60 return regmap_write(data->regmap,
61 data->desc->rst_bank_ofs[id / RST_NR_PER_BANK] +
63 BIT(id % RST_NR_PER_BANK));
66 static int mtk_reset_assert_set_clr(struct reset_controller_dev *rcdev,
69 return mtk_reset_update_set_clr(rcdev, id, false);
72 static int mtk_reset_deassert_set_clr(struct reset_controller_dev *rcdev,
75 return mtk_reset_update_set_clr(rcdev, id, true);
78 static int mtk_reset_set_clr(struct reset_controller_dev *rcdev,
83 ret = mtk_reset_assert_set_clr(rcdev, id);
86 return mtk_reset_deassert_set_clr(rcdev, id);
89 static const struct reset_control_ops mtk_reset_ops = {
90 .assert = mtk_reset_assert,
91 .deassert = mtk_reset_deassert,
95 static const struct reset_control_ops mtk_reset_ops_set_clr = {
96 .assert = mtk_reset_assert_set_clr,
97 .deassert = mtk_reset_deassert_set_clr,
98 .reset = mtk_reset_set_clr,
101 static int reset_xlate(struct reset_controller_dev *rcdev,
102 const struct of_phandle_args *reset_spec)
104 struct mtk_clk_rst_data *data = to_mtk_clk_rst_data(rcdev);
106 if (reset_spec->args[0] >= rcdev->nr_resets ||
107 reset_spec->args[0] >= data->desc->rst_idx_map_nr)
110 return data->desc->rst_idx_map[reset_spec->args[0]];
113 int mtk_register_reset_controller(struct device_node *np,
114 const struct mtk_clk_rst_desc *desc)
116 struct regmap *regmap;
117 const struct reset_control_ops *rcops = NULL;
118 struct mtk_clk_rst_data *data;
122 pr_err("mtk clock reset desc is NULL\n");
126 switch (desc->version) {
128 rcops = &mtk_reset_ops;
130 case MTK_RST_SET_CLR:
131 rcops = &mtk_reset_ops_set_clr;
134 pr_err("Unknown reset version %d\n", desc->version);
138 regmap = device_node_to_regmap(np);
139 if (IS_ERR(regmap)) {
140 pr_err("Cannot find regmap for %pOF: %pe\n", np, regmap);
144 data = kzalloc(sizeof(*data), GFP_KERNEL);
149 data->regmap = regmap;
150 data->rcdev.owner = THIS_MODULE;
151 data->rcdev.ops = rcops;
152 data->rcdev.of_node = np;
154 if (data->desc->rst_idx_map_nr > 0) {
155 data->rcdev.of_reset_n_cells = 1;
156 data->rcdev.nr_resets = desc->rst_idx_map_nr;
157 data->rcdev.of_xlate = reset_xlate;
159 data->rcdev.nr_resets = desc->rst_bank_nr * RST_NR_PER_BANK;
162 ret = reset_controller_register(&data->rcdev);
164 pr_err("could not register reset controller: %d\n", ret);
172 int mtk_register_reset_controller_with_dev(struct device *dev,
173 const struct mtk_clk_rst_desc *desc)
175 struct device_node *np = dev->of_node;
176 struct regmap *regmap;
177 const struct reset_control_ops *rcops = NULL;
178 struct mtk_clk_rst_data *data;
182 dev_err(dev, "mtk clock reset desc is NULL\n");
186 switch (desc->version) {
188 rcops = &mtk_reset_ops;
190 case MTK_RST_SET_CLR:
191 rcops = &mtk_reset_ops_set_clr;
194 dev_err(dev, "Unknown reset version %d\n", desc->version);
198 regmap = device_node_to_regmap(np);
199 if (IS_ERR(regmap)) {
200 dev_err(dev, "Cannot find regmap %pe\n", regmap);
204 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
209 data->regmap = regmap;
210 data->rcdev.owner = THIS_MODULE;
211 data->rcdev.ops = rcops;
212 data->rcdev.of_node = np;
213 data->rcdev.dev = dev;
215 if (data->desc->rst_idx_map_nr > 0) {
216 data->rcdev.of_reset_n_cells = 1;
217 data->rcdev.nr_resets = desc->rst_idx_map_nr;
218 data->rcdev.of_xlate = reset_xlate;
220 data->rcdev.nr_resets = desc->rst_bank_nr * RST_NR_PER_BANK;
223 ret = devm_reset_controller_register(dev, &data->rcdev);
225 dev_err(dev, "could not register reset controller: %d\n", ret);
231 EXPORT_SYMBOL_GPL(mtk_register_reset_controller_with_dev);
233 MODULE_LICENSE("GPL");