1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2015 Linaro Ltd. 4 * Author: Pi-Cheng Chen <pi-cheng.chen@linaro.org> 5 */ 6 7 #include <linux/clk-provider.h> 8 #include <linux/container_of.h> 9 #include <linux/err.h> 10 #include <linux/mfd/syscon.h> 11 #include <linux/module.h> 12 #include <linux/regmap.h> 13 #include <linux/slab.h> 14 15 #include "clk-mtk.h" 16 #include "clk-cpumux.h" 17 18 struct mtk_clk_cpumux { 19 struct clk_hw hw; 20 struct regmap *regmap; 21 u32 reg; 22 u32 mask; 23 u8 shift; 24 }; 25 26 static inline struct mtk_clk_cpumux *to_mtk_clk_cpumux(struct clk_hw *_hw) 27 { 28 return container_of(_hw, struct mtk_clk_cpumux, hw); 29 } 30 31 static u8 clk_cpumux_get_parent(struct clk_hw *hw) 32 { 33 struct mtk_clk_cpumux *mux = to_mtk_clk_cpumux(hw); 34 unsigned int val; 35 36 regmap_read(mux->regmap, mux->reg, &val); 37 38 val >>= mux->shift; 39 val &= mux->mask; 40 41 return val; 42 } 43 44 static int clk_cpumux_set_parent(struct clk_hw *hw, u8 index) 45 { 46 struct mtk_clk_cpumux *mux = to_mtk_clk_cpumux(hw); 47 u32 mask, val; 48 49 val = index << mux->shift; 50 mask = mux->mask << mux->shift; 51 52 return regmap_update_bits(mux->regmap, mux->reg, mask, val); 53 } 54 55 static const struct clk_ops clk_cpumux_ops = { 56 .determine_rate = clk_hw_determine_rate_no_reparent, 57 .get_parent = clk_cpumux_get_parent, 58 .set_parent = clk_cpumux_set_parent, 59 }; 60 61 static struct clk_hw * 62 mtk_clk_register_cpumux(struct device *dev, const struct mtk_composite *mux, 63 struct regmap *regmap) 64 { 65 struct mtk_clk_cpumux *cpumux; 66 int ret; 67 struct clk_init_data init; 68 69 cpumux = kzalloc(sizeof(*cpumux), GFP_KERNEL); 70 if (!cpumux) 71 return ERR_PTR(-ENOMEM); 72 73 init.name = mux->name; 74 init.ops = &clk_cpumux_ops; 75 init.parent_names = mux->parent_names; 76 init.num_parents = mux->num_parents; 77 init.flags = mux->flags; 78 79 cpumux->reg = mux->mux_reg; 80 cpumux->shift = mux->mux_shift; 81 cpumux->mask = BIT(mux->mux_width) - 1; 82 cpumux->regmap = regmap; 83 cpumux->hw.init = &init; 84 85 ret = clk_hw_register(dev, &cpumux->hw); 86 if (ret) { 87 kfree(cpumux); 88 return ERR_PTR(ret); 89 } 90 91 return &cpumux->hw; 92 } 93 94 static void mtk_clk_unregister_cpumux(struct clk_hw *hw) 95 { 96 struct mtk_clk_cpumux *cpumux; 97 if (!hw) 98 return; 99 100 cpumux = to_mtk_clk_cpumux(hw); 101 102 clk_hw_unregister(hw); 103 kfree(cpumux); 104 } 105 106 int mtk_clk_register_cpumuxes(struct device *dev, struct device_node *node, 107 const struct mtk_composite *clks, int num, 108 struct clk_hw_onecell_data *clk_data) 109 { 110 int i; 111 struct clk_hw *hw; 112 struct regmap *regmap; 113 114 regmap = device_node_to_regmap(node); 115 if (IS_ERR(regmap)) { 116 pr_err("Cannot find regmap for %pOF: %pe\n", node, regmap); 117 return PTR_ERR(regmap); 118 } 119 120 for (i = 0; i < num; i++) { 121 const struct mtk_composite *mux = &clks[i]; 122 123 if (!IS_ERR_OR_NULL(clk_data->hws[mux->id])) { 124 pr_warn("%pOF: Trying to register duplicate clock ID: %d\n", 125 node, mux->id); 126 continue; 127 } 128 129 hw = mtk_clk_register_cpumux(dev, mux, regmap); 130 if (IS_ERR(hw)) { 131 pr_err("Failed to register clk %s: %pe\n", mux->name, 132 hw); 133 goto err; 134 } 135 136 clk_data->hws[mux->id] = hw; 137 } 138 139 return 0; 140 141 err: 142 while (--i >= 0) { 143 const struct mtk_composite *mux = &clks[i]; 144 145 if (IS_ERR_OR_NULL(clk_data->hws[mux->id])) 146 continue; 147 148 mtk_clk_unregister_cpumux(clk_data->hws[mux->id]); 149 clk_data->hws[mux->id] = ERR_PTR(-ENOENT); 150 } 151 152 return PTR_ERR(hw); 153 } 154 EXPORT_SYMBOL_GPL(mtk_clk_register_cpumuxes); 155 156 void mtk_clk_unregister_cpumuxes(const struct mtk_composite *clks, int num, 157 struct clk_hw_onecell_data *clk_data) 158 { 159 int i; 160 161 for (i = num; i > 0; i--) { 162 const struct mtk_composite *mux = &clks[i - 1]; 163 164 if (IS_ERR_OR_NULL(clk_data->hws[mux->id])) 165 continue; 166 167 mtk_clk_unregister_cpumux(clk_data->hws[mux->id]); 168 clk_data->hws[mux->id] = ERR_PTR(-ENOENT); 169 } 170 } 171 EXPORT_SYMBOL_GPL(mtk_clk_unregister_cpumuxes); 172 173 MODULE_LICENSE("GPL"); 174