1 /* 2 * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved. 3 * 4 * This software is licensed under the terms of the GNU General Public 5 * License version 2, as published by the Free Software Foundation, and 6 * may be copied, distributed, and modified under those terms. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 */ 13 14 #include <linux/export.h> 15 #include <linux/regmap.h> 16 #include <linux/platform_device.h> 17 #include <linux/clk-provider.h> 18 #include <linux/reset-controller.h> 19 20 #include "common.h" 21 #include "clk-rcg.h" 22 #include "clk-regmap.h" 23 #include "reset.h" 24 25 struct qcom_cc { 26 struct qcom_reset_controller reset; 27 struct clk_onecell_data data; 28 struct clk *clks[]; 29 }; 30 31 const 32 struct freq_tbl *qcom_find_freq(const struct freq_tbl *f, unsigned long rate) 33 { 34 if (!f) 35 return NULL; 36 37 for (; f->freq; f++) 38 if (rate <= f->freq) 39 return f; 40 41 /* Default to our fastest rate */ 42 return f - 1; 43 } 44 EXPORT_SYMBOL_GPL(qcom_find_freq); 45 46 int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src) 47 { 48 int i, num_parents = __clk_get_num_parents(hw->clk); 49 50 for (i = 0; i < num_parents; i++) 51 if (src == map[i].src) 52 return i; 53 54 return -ENOENT; 55 } 56 EXPORT_SYMBOL_GPL(qcom_find_src_index); 57 58 struct regmap * 59 qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc) 60 { 61 void __iomem *base; 62 struct resource *res; 63 struct device *dev = &pdev->dev; 64 65 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 66 base = devm_ioremap_resource(dev, res); 67 if (IS_ERR(base)) 68 return ERR_CAST(base); 69 70 return devm_regmap_init_mmio(dev, base, desc->config); 71 } 72 EXPORT_SYMBOL_GPL(qcom_cc_map); 73 74 int qcom_cc_really_probe(struct platform_device *pdev, 75 const struct qcom_cc_desc *desc, struct regmap *regmap) 76 { 77 int i, ret; 78 struct device *dev = &pdev->dev; 79 struct clk *clk; 80 struct clk_onecell_data *data; 81 struct clk **clks; 82 struct qcom_reset_controller *reset; 83 struct qcom_cc *cc; 84 size_t num_clks = desc->num_clks; 85 struct clk_regmap **rclks = desc->clks; 86 87 cc = devm_kzalloc(dev, sizeof(*cc) + sizeof(*clks) * num_clks, 88 GFP_KERNEL); 89 if (!cc) 90 return -ENOMEM; 91 92 clks = cc->clks; 93 data = &cc->data; 94 data->clks = clks; 95 data->clk_num = num_clks; 96 97 for (i = 0; i < num_clks; i++) { 98 if (!rclks[i]) { 99 clks[i] = ERR_PTR(-ENOENT); 100 continue; 101 } 102 clk = devm_clk_register_regmap(dev, rclks[i]); 103 if (IS_ERR(clk)) 104 return PTR_ERR(clk); 105 clks[i] = clk; 106 } 107 108 ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get, data); 109 if (ret) 110 return ret; 111 112 reset = &cc->reset; 113 reset->rcdev.of_node = dev->of_node; 114 reset->rcdev.ops = &qcom_reset_ops; 115 reset->rcdev.owner = dev->driver->owner; 116 reset->rcdev.nr_resets = desc->num_resets; 117 reset->regmap = regmap; 118 reset->reset_map = desc->resets; 119 platform_set_drvdata(pdev, &reset->rcdev); 120 121 ret = reset_controller_register(&reset->rcdev); 122 if (ret) 123 of_clk_del_provider(dev->of_node); 124 125 return ret; 126 } 127 EXPORT_SYMBOL_GPL(qcom_cc_really_probe); 128 129 int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc) 130 { 131 struct regmap *regmap; 132 133 regmap = qcom_cc_map(pdev, desc); 134 if (IS_ERR(regmap)) 135 return PTR_ERR(regmap); 136 137 return qcom_cc_really_probe(pdev, desc, regmap); 138 } 139 EXPORT_SYMBOL_GPL(qcom_cc_probe); 140 141 void qcom_cc_remove(struct platform_device *pdev) 142 { 143 of_clk_del_provider(pdev->dev.of_node); 144 reset_controller_unregister(platform_get_drvdata(pdev)); 145 } 146 EXPORT_SYMBOL_GPL(qcom_cc_remove); 147