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 #include <linux/of.h> 21 22 #include "common.h" 23 #include "clk-rcg.h" 24 #include "clk-regmap.h" 25 #include "reset.h" 26 #include "gdsc.h" 27 28 struct qcom_cc { 29 struct qcom_reset_controller reset; 30 struct clk_onecell_data data; 31 struct clk *clks[]; 32 }; 33 34 const 35 struct freq_tbl *qcom_find_freq(const struct freq_tbl *f, unsigned long rate) 36 { 37 if (!f) 38 return NULL; 39 40 for (; f->freq; f++) 41 if (rate <= f->freq) 42 return f; 43 44 /* Default to our fastest rate */ 45 return f - 1; 46 } 47 EXPORT_SYMBOL_GPL(qcom_find_freq); 48 49 int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src) 50 { 51 int i, num_parents = clk_hw_get_num_parents(hw); 52 53 for (i = 0; i < num_parents; i++) 54 if (src == map[i].src) 55 return i; 56 57 return -ENOENT; 58 } 59 EXPORT_SYMBOL_GPL(qcom_find_src_index); 60 61 struct regmap * 62 qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc) 63 { 64 void __iomem *base; 65 struct resource *res; 66 struct device *dev = &pdev->dev; 67 68 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 69 base = devm_ioremap_resource(dev, res); 70 if (IS_ERR(base)) 71 return ERR_CAST(base); 72 73 return devm_regmap_init_mmio(dev, base, desc->config); 74 } 75 EXPORT_SYMBOL_GPL(qcom_cc_map); 76 77 static void qcom_cc_del_clk_provider(void *data) 78 { 79 of_clk_del_provider(data); 80 } 81 82 static void qcom_cc_reset_unregister(void *data) 83 { 84 reset_controller_unregister(data); 85 } 86 87 static void qcom_cc_gdsc_unregister(void *data) 88 { 89 gdsc_unregister(data); 90 } 91 92 /* 93 * Backwards compatibility with old DTs. Register a pass-through factor 1/1 94 * clock to translate 'path' clk into 'name' clk and regsiter the 'path' 95 * clk as a fixed rate clock if it isn't present. 96 */ 97 static int _qcom_cc_register_board_clk(struct device *dev, const char *path, 98 const char *name, unsigned long rate, 99 bool add_factor) 100 { 101 struct device_node *node = NULL; 102 struct device_node *clocks_node; 103 struct clk_fixed_factor *factor; 104 struct clk_fixed_rate *fixed; 105 struct clk *clk; 106 struct clk_init_data init_data = { }; 107 108 clocks_node = of_find_node_by_path("/clocks"); 109 if (clocks_node) 110 node = of_find_node_by_name(clocks_node, path); 111 of_node_put(clocks_node); 112 113 if (!node) { 114 fixed = devm_kzalloc(dev, sizeof(*fixed), GFP_KERNEL); 115 if (!fixed) 116 return -EINVAL; 117 118 fixed->fixed_rate = rate; 119 fixed->hw.init = &init_data; 120 121 init_data.name = path; 122 init_data.flags = CLK_IS_ROOT; 123 init_data.ops = &clk_fixed_rate_ops; 124 125 clk = devm_clk_register(dev, &fixed->hw); 126 if (IS_ERR(clk)) 127 return PTR_ERR(clk); 128 } 129 of_node_put(node); 130 131 if (add_factor) { 132 factor = devm_kzalloc(dev, sizeof(*factor), GFP_KERNEL); 133 if (!factor) 134 return -EINVAL; 135 136 factor->mult = factor->div = 1; 137 factor->hw.init = &init_data; 138 139 init_data.name = name; 140 init_data.parent_names = &path; 141 init_data.num_parents = 1; 142 init_data.flags = 0; 143 init_data.ops = &clk_fixed_factor_ops; 144 145 clk = devm_clk_register(dev, &factor->hw); 146 if (IS_ERR(clk)) 147 return PTR_ERR(clk); 148 } 149 150 return 0; 151 } 152 153 int qcom_cc_register_board_clk(struct device *dev, const char *path, 154 const char *name, unsigned long rate) 155 { 156 bool add_factor = true; 157 struct device_node *node; 158 159 /* The RPM clock driver will add the factor clock if present */ 160 if (IS_ENABLED(CONFIG_QCOM_RPMCC)) { 161 node = of_find_compatible_node(NULL, NULL, "qcom,rpmcc"); 162 if (of_device_is_available(node)) 163 add_factor = false; 164 of_node_put(node); 165 } 166 167 return _qcom_cc_register_board_clk(dev, path, name, rate, add_factor); 168 } 169 EXPORT_SYMBOL_GPL(qcom_cc_register_board_clk); 170 171 int qcom_cc_register_sleep_clk(struct device *dev) 172 { 173 return _qcom_cc_register_board_clk(dev, "sleep_clk", "sleep_clk_src", 174 32768, true); 175 } 176 EXPORT_SYMBOL_GPL(qcom_cc_register_sleep_clk); 177 178 int qcom_cc_really_probe(struct platform_device *pdev, 179 const struct qcom_cc_desc *desc, struct regmap *regmap) 180 { 181 int i, ret; 182 struct device *dev = &pdev->dev; 183 struct clk *clk; 184 struct clk_onecell_data *data; 185 struct clk **clks; 186 struct qcom_reset_controller *reset; 187 struct qcom_cc *cc; 188 size_t num_clks = desc->num_clks; 189 struct clk_regmap **rclks = desc->clks; 190 191 cc = devm_kzalloc(dev, sizeof(*cc) + sizeof(*clks) * num_clks, 192 GFP_KERNEL); 193 if (!cc) 194 return -ENOMEM; 195 196 clks = cc->clks; 197 data = &cc->data; 198 data->clks = clks; 199 data->clk_num = num_clks; 200 201 for (i = 0; i < num_clks; i++) { 202 if (!rclks[i]) { 203 clks[i] = ERR_PTR(-ENOENT); 204 continue; 205 } 206 clk = devm_clk_register_regmap(dev, rclks[i]); 207 if (IS_ERR(clk)) 208 return PTR_ERR(clk); 209 clks[i] = clk; 210 } 211 212 ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get, data); 213 if (ret) 214 return ret; 215 216 devm_add_action(dev, qcom_cc_del_clk_provider, pdev->dev.of_node); 217 218 reset = &cc->reset; 219 reset->rcdev.of_node = dev->of_node; 220 reset->rcdev.ops = &qcom_reset_ops; 221 reset->rcdev.owner = dev->driver->owner; 222 reset->rcdev.nr_resets = desc->num_resets; 223 reset->regmap = regmap; 224 reset->reset_map = desc->resets; 225 226 ret = reset_controller_register(&reset->rcdev); 227 if (ret) 228 return ret; 229 230 devm_add_action(dev, qcom_cc_reset_unregister, &reset->rcdev); 231 232 if (desc->gdscs && desc->num_gdscs) { 233 ret = gdsc_register(dev, desc->gdscs, desc->num_gdscs, 234 &reset->rcdev, regmap); 235 if (ret) 236 return ret; 237 } 238 239 devm_add_action(dev, qcom_cc_gdsc_unregister, dev); 240 241 242 return 0; 243 } 244 EXPORT_SYMBOL_GPL(qcom_cc_really_probe); 245 246 int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc) 247 { 248 struct regmap *regmap; 249 250 regmap = qcom_cc_map(pdev, desc); 251 if (IS_ERR(regmap)) 252 return PTR_ERR(regmap); 253 254 return qcom_cc_really_probe(pdev, desc, regmap); 255 } 256 EXPORT_SYMBOL_GPL(qcom_cc_probe); 257 258 MODULE_LICENSE("GPL v2"); 259