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/mfd/syscon.h> 9 #include <linux/slab.h> 10 11 #include "clk-mtk.h" 12 #include "clk-cpumux.h" 13 14 static inline struct mtk_clk_cpumux *to_mtk_clk_cpumux(struct clk_hw *_hw) 15 { 16 return container_of(_hw, struct mtk_clk_cpumux, hw); 17 } 18 19 static u8 clk_cpumux_get_parent(struct clk_hw *hw) 20 { 21 struct mtk_clk_cpumux *mux = to_mtk_clk_cpumux(hw); 22 unsigned int val; 23 24 regmap_read(mux->regmap, mux->reg, &val); 25 26 val >>= mux->shift; 27 val &= mux->mask; 28 29 return val; 30 } 31 32 static int clk_cpumux_set_parent(struct clk_hw *hw, u8 index) 33 { 34 struct mtk_clk_cpumux *mux = to_mtk_clk_cpumux(hw); 35 u32 mask, val; 36 37 val = index << mux->shift; 38 mask = mux->mask << mux->shift; 39 40 return regmap_update_bits(mux->regmap, mux->reg, mask, val); 41 } 42 43 static const struct clk_ops clk_cpumux_ops = { 44 .get_parent = clk_cpumux_get_parent, 45 .set_parent = clk_cpumux_set_parent, 46 }; 47 48 static struct clk * 49 mtk_clk_register_cpumux(const struct mtk_composite *mux, 50 struct regmap *regmap) 51 { 52 struct mtk_clk_cpumux *cpumux; 53 struct clk *clk; 54 struct clk_init_data init; 55 56 cpumux = kzalloc(sizeof(*cpumux), GFP_KERNEL); 57 if (!cpumux) 58 return ERR_PTR(-ENOMEM); 59 60 init.name = mux->name; 61 init.ops = &clk_cpumux_ops; 62 init.parent_names = mux->parent_names; 63 init.num_parents = mux->num_parents; 64 init.flags = mux->flags; 65 66 cpumux->reg = mux->mux_reg; 67 cpumux->shift = mux->mux_shift; 68 cpumux->mask = BIT(mux->mux_width) - 1; 69 cpumux->regmap = regmap; 70 cpumux->hw.init = &init; 71 72 clk = clk_register(NULL, &cpumux->hw); 73 if (IS_ERR(clk)) 74 kfree(cpumux); 75 76 return clk; 77 } 78 79 int mtk_clk_register_cpumuxes(struct device_node *node, 80 const struct mtk_composite *clks, int num, 81 struct clk_onecell_data *clk_data) 82 { 83 int i; 84 struct clk *clk; 85 struct regmap *regmap; 86 87 regmap = syscon_node_to_regmap(node); 88 if (IS_ERR(regmap)) { 89 pr_err("Cannot find regmap for %pOF: %ld\n", node, 90 PTR_ERR(regmap)); 91 return PTR_ERR(regmap); 92 } 93 94 for (i = 0; i < num; i++) { 95 const struct mtk_composite *mux = &clks[i]; 96 97 clk = mtk_clk_register_cpumux(mux, regmap); 98 if (IS_ERR(clk)) { 99 pr_err("Failed to register clk %s: %ld\n", 100 mux->name, PTR_ERR(clk)); 101 continue; 102 } 103 104 clk_data->clks[mux->id] = clk; 105 } 106 107 return 0; 108 } 109