James Liao | 9741b1a | 2015-04-23 10:35:39 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2014 MediaTek Inc. |
| 3 | * Author: James Liao <jamesjj.liao@mediatek.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/of.h> |
| 16 | #include <linux/of_address.h> |
| 17 | |
| 18 | #include <linux/io.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/delay.h> |
| 21 | #include <linux/clkdev.h> |
| 22 | |
| 23 | #include "clk-mtk.h" |
| 24 | #include "clk-gate.h" |
| 25 | |
| 26 | static int mtk_cg_bit_is_cleared(struct clk_hw *hw) |
| 27 | { |
| 28 | struct mtk_clk_gate *cg = to_clk_gate(hw); |
| 29 | u32 val; |
| 30 | |
| 31 | regmap_read(cg->regmap, cg->sta_ofs, &val); |
| 32 | |
| 33 | val &= BIT(cg->bit); |
| 34 | |
| 35 | return val == 0; |
| 36 | } |
| 37 | |
| 38 | static int mtk_cg_bit_is_set(struct clk_hw *hw) |
| 39 | { |
| 40 | struct mtk_clk_gate *cg = to_clk_gate(hw); |
| 41 | u32 val; |
| 42 | |
| 43 | regmap_read(cg->regmap, cg->sta_ofs, &val); |
| 44 | |
| 45 | val &= BIT(cg->bit); |
| 46 | |
| 47 | return val != 0; |
| 48 | } |
| 49 | |
| 50 | static void mtk_cg_set_bit(struct clk_hw *hw) |
| 51 | { |
| 52 | struct mtk_clk_gate *cg = to_clk_gate(hw); |
| 53 | |
| 54 | regmap_write(cg->regmap, cg->set_ofs, BIT(cg->bit)); |
| 55 | } |
| 56 | |
| 57 | static void mtk_cg_clr_bit(struct clk_hw *hw) |
| 58 | { |
| 59 | struct mtk_clk_gate *cg = to_clk_gate(hw); |
| 60 | |
| 61 | regmap_write(cg->regmap, cg->clr_ofs, BIT(cg->bit)); |
| 62 | } |
| 63 | |
| 64 | static int mtk_cg_enable(struct clk_hw *hw) |
| 65 | { |
| 66 | mtk_cg_clr_bit(hw); |
| 67 | |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | static void mtk_cg_disable(struct clk_hw *hw) |
| 72 | { |
| 73 | mtk_cg_set_bit(hw); |
| 74 | } |
| 75 | |
| 76 | static int mtk_cg_enable_inv(struct clk_hw *hw) |
| 77 | { |
| 78 | mtk_cg_set_bit(hw); |
| 79 | |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | static void mtk_cg_disable_inv(struct clk_hw *hw) |
| 84 | { |
| 85 | mtk_cg_clr_bit(hw); |
| 86 | } |
| 87 | |
| 88 | const struct clk_ops mtk_clk_gate_ops_setclr = { |
| 89 | .is_enabled = mtk_cg_bit_is_cleared, |
| 90 | .enable = mtk_cg_enable, |
| 91 | .disable = mtk_cg_disable, |
| 92 | }; |
| 93 | |
| 94 | const struct clk_ops mtk_clk_gate_ops_setclr_inv = { |
| 95 | .is_enabled = mtk_cg_bit_is_set, |
| 96 | .enable = mtk_cg_enable_inv, |
| 97 | .disable = mtk_cg_disable_inv, |
| 98 | }; |
| 99 | |
| 100 | struct clk *mtk_clk_register_gate( |
| 101 | const char *name, |
| 102 | const char *parent_name, |
| 103 | struct regmap *regmap, |
| 104 | int set_ofs, |
| 105 | int clr_ofs, |
| 106 | int sta_ofs, |
| 107 | u8 bit, |
| 108 | const struct clk_ops *ops) |
| 109 | { |
| 110 | struct mtk_clk_gate *cg; |
| 111 | struct clk *clk; |
Ricky Liang | 95f5898 | 2015-05-18 22:00:26 +0800 | [diff] [blame] | 112 | struct clk_init_data init = {}; |
James Liao | 9741b1a | 2015-04-23 10:35:39 +0200 | [diff] [blame] | 113 | |
| 114 | cg = kzalloc(sizeof(*cg), GFP_KERNEL); |
| 115 | if (!cg) |
| 116 | return ERR_PTR(-ENOMEM); |
| 117 | |
| 118 | init.name = name; |
| 119 | init.flags = CLK_SET_RATE_PARENT; |
| 120 | init.parent_names = parent_name ? &parent_name : NULL; |
| 121 | init.num_parents = parent_name ? 1 : 0; |
| 122 | init.ops = ops; |
| 123 | |
| 124 | cg->regmap = regmap; |
| 125 | cg->set_ofs = set_ofs; |
| 126 | cg->clr_ofs = clr_ofs; |
| 127 | cg->sta_ofs = sta_ofs; |
| 128 | cg->bit = bit; |
| 129 | |
| 130 | cg->hw.init = &init; |
| 131 | |
| 132 | clk = clk_register(NULL, &cg->hw); |
| 133 | if (IS_ERR(clk)) |
| 134 | kfree(cg); |
| 135 | |
| 136 | return clk; |
| 137 | } |