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/module.h> 16 #include <linux/regmap.h> 17 #include <linux/platform_device.h> 18 #include <linux/clk-provider.h> 19 #include <linux/reset-controller.h> 20 21 #include "common.h" 22 #include "clk-rcg.h" 23 #include "clk-regmap.h" 24 #include "reset.h" 25 26 struct qcom_cc { 27 struct qcom_reset_controller reset; 28 struct clk_onecell_data data; 29 struct clk *clks[]; 30 }; 31 32 const 33 struct freq_tbl *qcom_find_freq(const struct freq_tbl *f, unsigned long rate) 34 { 35 if (!f) 36 return NULL; 37 38 for (; f->freq; f++) 39 if (rate <= f->freq) 40 return f; 41 42 /* Default to our fastest rate */ 43 return f - 1; 44 } 45 EXPORT_SYMBOL_GPL(qcom_find_freq); 46 47 int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src) 48 { 49 int i, num_parents = clk_hw_get_num_parents(hw); 50 51 for (i = 0; i < num_parents; i++) 52 if (src == map[i].src) 53 return i; 54 55 return -ENOENT; 56 } 57 EXPORT_SYMBOL_GPL(qcom_find_src_index); 58 59 struct regmap * 60 qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc) 61 { 62 void __iomem *base; 63 struct resource *res; 64 struct device *dev = &pdev->dev; 65 66 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 67 base = devm_ioremap_resource(dev, res); 68 if (IS_ERR(base)) 69 return ERR_CAST(base); 70 71 return devm_regmap_init_mmio(dev, base, desc->config); 72 } 73 EXPORT_SYMBOL_GPL(qcom_cc_map); 74 75 int qcom_cc_really_probe(struct platform_device *pdev, 76 const struct qcom_cc_desc *desc, struct regmap *regmap) 77 { 78 int i, ret; 79 struct device *dev = &pdev->dev; 80 struct clk *clk; 81 struct clk_onecell_data *data; 82 struct clk **clks; 83 struct qcom_reset_controller *reset; 84 struct qcom_cc *cc; 85 size_t num_clks = desc->num_clks; 86 struct clk_regmap **rclks = desc->clks; 87 88 cc = devm_kzalloc(dev, sizeof(*cc) + sizeof(*clks) * num_clks, 89 GFP_KERNEL); 90 if (!cc) 91 return -ENOMEM; 92 93 clks = cc->clks; 94 data = &cc->data; 95 data->clks = clks; 96 data->clk_num = num_clks; 97 98 for (i = 0; i < num_clks; i++) { 99 if (!rclks[i]) { 100 clks[i] = ERR_PTR(-ENOENT); 101 continue; 102 } 103 clk = devm_clk_register_regmap(dev, rclks[i]); 104 if (IS_ERR(clk)) 105 return PTR_ERR(clk); 106 clks[i] = clk; 107 } 108 109 ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get, data); 110 if (ret) 111 return ret; 112 113 reset = &cc->reset; 114 reset->rcdev.of_node = dev->of_node; 115 reset->rcdev.ops = &qcom_reset_ops; 116 reset->rcdev.owner = dev->driver->owner; 117 reset->rcdev.nr_resets = desc->num_resets; 118 reset->regmap = regmap; 119 reset->reset_map = desc->resets; 120 platform_set_drvdata(pdev, &reset->rcdev); 121 122 ret = reset_controller_register(&reset->rcdev); 123 if (ret) 124 of_clk_del_provider(dev->of_node); 125 126 return ret; 127 } 128 EXPORT_SYMBOL_GPL(qcom_cc_really_probe); 129 130 int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc) 131 { 132 struct regmap *regmap; 133 134 regmap = qcom_cc_map(pdev, desc); 135 if (IS_ERR(regmap)) 136 return PTR_ERR(regmap); 137 138 return qcom_cc_really_probe(pdev, desc, regmap); 139 } 140 EXPORT_SYMBOL_GPL(qcom_cc_probe); 141 142 void qcom_cc_remove(struct platform_device *pdev) 143 { 144 of_clk_del_provider(pdev->dev.of_node); 145 reset_controller_unregister(platform_get_drvdata(pdev)); 146 } 147 EXPORT_SYMBOL_GPL(qcom_cc_remove); 148 149 MODULE_LICENSE("GPL v2"); 150