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-regmap.h" 22 #include "reset.h" 23 24 struct qcom_cc { 25 struct qcom_reset_controller reset; 26 struct clk_onecell_data data; 27 struct clk *clks[]; 28 }; 29 30 struct regmap * 31 qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc) 32 { 33 void __iomem *base; 34 struct resource *res; 35 struct device *dev = &pdev->dev; 36 37 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 38 base = devm_ioremap_resource(dev, res); 39 if (IS_ERR(base)) 40 return ERR_CAST(base); 41 42 return devm_regmap_init_mmio(dev, base, desc->config); 43 } 44 EXPORT_SYMBOL_GPL(qcom_cc_map); 45 46 int qcom_cc_really_probe(struct platform_device *pdev, 47 const struct qcom_cc_desc *desc, struct regmap *regmap) 48 { 49 int i, ret; 50 struct device *dev = &pdev->dev; 51 struct clk *clk; 52 struct clk_onecell_data *data; 53 struct clk **clks; 54 struct qcom_reset_controller *reset; 55 struct qcom_cc *cc; 56 size_t num_clks = desc->num_clks; 57 struct clk_regmap **rclks = desc->clks; 58 59 cc = devm_kzalloc(dev, sizeof(*cc) + sizeof(*clks) * num_clks, 60 GFP_KERNEL); 61 if (!cc) 62 return -ENOMEM; 63 64 clks = cc->clks; 65 data = &cc->data; 66 data->clks = clks; 67 data->clk_num = num_clks; 68 69 for (i = 0; i < num_clks; i++) { 70 if (!rclks[i]) { 71 clks[i] = ERR_PTR(-ENOENT); 72 continue; 73 } 74 clk = devm_clk_register_regmap(dev, rclks[i]); 75 if (IS_ERR(clk)) 76 return PTR_ERR(clk); 77 clks[i] = clk; 78 } 79 80 ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get, data); 81 if (ret) 82 return ret; 83 84 reset = &cc->reset; 85 reset->rcdev.of_node = dev->of_node; 86 reset->rcdev.ops = &qcom_reset_ops; 87 reset->rcdev.owner = dev->driver->owner; 88 reset->rcdev.nr_resets = desc->num_resets; 89 reset->regmap = regmap; 90 reset->reset_map = desc->resets; 91 platform_set_drvdata(pdev, &reset->rcdev); 92 93 ret = reset_controller_register(&reset->rcdev); 94 if (ret) 95 of_clk_del_provider(dev->of_node); 96 97 return ret; 98 } 99 EXPORT_SYMBOL_GPL(qcom_cc_really_probe); 100 101 int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc) 102 { 103 struct regmap *regmap; 104 105 regmap = qcom_cc_map(pdev, desc); 106 if (IS_ERR(regmap)) 107 return PTR_ERR(regmap); 108 109 return qcom_cc_really_probe(pdev, desc, regmap); 110 } 111 EXPORT_SYMBOL_GPL(qcom_cc_probe); 112 113 void qcom_cc_remove(struct platform_device *pdev) 114 { 115 of_clk_del_provider(pdev->dev.of_node); 116 reset_controller_unregister(platform_get_drvdata(pdev)); 117 } 118 EXPORT_SYMBOL_GPL(qcom_cc_remove); 119