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_regmap **rclks; 31 size_t num_rclks; 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 const struct freq_tbl *qcom_find_freq_floor(const struct freq_tbl *f, 50 unsigned long rate) 51 { 52 const struct freq_tbl *best = NULL; 53 54 for ( ; f->freq; f++) { 55 if (rate >= f->freq) 56 best = f; 57 else 58 break; 59 } 60 61 return best; 62 } 63 EXPORT_SYMBOL_GPL(qcom_find_freq_floor); 64 65 int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src) 66 { 67 int i, num_parents = clk_hw_get_num_parents(hw); 68 69 for (i = 0; i < num_parents; i++) 70 if (src == map[i].src) 71 return i; 72 73 return -ENOENT; 74 } 75 EXPORT_SYMBOL_GPL(qcom_find_src_index); 76 77 struct regmap * 78 qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc) 79 { 80 void __iomem *base; 81 struct resource *res; 82 struct device *dev = &pdev->dev; 83 84 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 85 base = devm_ioremap_resource(dev, res); 86 if (IS_ERR(base)) 87 return ERR_CAST(base); 88 89 return devm_regmap_init_mmio(dev, base, desc->config); 90 } 91 EXPORT_SYMBOL_GPL(qcom_cc_map); 92 93 void 94 qcom_pll_set_fsm_mode(struct regmap *map, u32 reg, u8 bias_count, u8 lock_count) 95 { 96 u32 val; 97 u32 mask; 98 99 /* De-assert reset to FSM */ 100 regmap_update_bits(map, reg, PLL_VOTE_FSM_RESET, 0); 101 102 /* Program bias count and lock count */ 103 val = bias_count << PLL_BIAS_COUNT_SHIFT | 104 lock_count << PLL_LOCK_COUNT_SHIFT; 105 mask = PLL_BIAS_COUNT_MASK << PLL_BIAS_COUNT_SHIFT; 106 mask |= PLL_LOCK_COUNT_MASK << PLL_LOCK_COUNT_SHIFT; 107 regmap_update_bits(map, reg, mask, val); 108 109 /* Enable PLL FSM voting */ 110 regmap_update_bits(map, reg, PLL_VOTE_FSM_ENA, PLL_VOTE_FSM_ENA); 111 } 112 EXPORT_SYMBOL_GPL(qcom_pll_set_fsm_mode); 113 114 static void qcom_cc_del_clk_provider(void *data) 115 { 116 of_clk_del_provider(data); 117 } 118 119 static void qcom_cc_reset_unregister(void *data) 120 { 121 reset_controller_unregister(data); 122 } 123 124 static void qcom_cc_gdsc_unregister(void *data) 125 { 126 gdsc_unregister(data); 127 } 128 129 /* 130 * Backwards compatibility with old DTs. Register a pass-through factor 1/1 131 * clock to translate 'path' clk into 'name' clk and regsiter the 'path' 132 * clk as a fixed rate clock if it isn't present. 133 */ 134 static int _qcom_cc_register_board_clk(struct device *dev, const char *path, 135 const char *name, unsigned long rate, 136 bool add_factor) 137 { 138 struct device_node *node = NULL; 139 struct device_node *clocks_node; 140 struct clk_fixed_factor *factor; 141 struct clk_fixed_rate *fixed; 142 struct clk_init_data init_data = { }; 143 int ret; 144 145 clocks_node = of_find_node_by_path("/clocks"); 146 if (clocks_node) 147 node = of_find_node_by_name(clocks_node, path); 148 149 if (!node) { 150 fixed = devm_kzalloc(dev, sizeof(*fixed), GFP_KERNEL); 151 if (!fixed) 152 return -EINVAL; 153 154 fixed->fixed_rate = rate; 155 fixed->hw.init = &init_data; 156 157 init_data.name = path; 158 init_data.ops = &clk_fixed_rate_ops; 159 160 ret = devm_clk_hw_register(dev, &fixed->hw); 161 if (ret) 162 return ret; 163 } 164 of_node_put(node); 165 166 if (add_factor) { 167 factor = devm_kzalloc(dev, sizeof(*factor), GFP_KERNEL); 168 if (!factor) 169 return -EINVAL; 170 171 factor->mult = factor->div = 1; 172 factor->hw.init = &init_data; 173 174 init_data.name = name; 175 init_data.parent_names = &path; 176 init_data.num_parents = 1; 177 init_data.flags = 0; 178 init_data.ops = &clk_fixed_factor_ops; 179 180 ret = devm_clk_hw_register(dev, &factor->hw); 181 if (ret) 182 return ret; 183 } 184 185 return 0; 186 } 187 188 int qcom_cc_register_board_clk(struct device *dev, const char *path, 189 const char *name, unsigned long rate) 190 { 191 bool add_factor = true; 192 193 /* 194 * TODO: The RPM clock driver currently does not support the xo clock. 195 * When xo is added to the RPM clock driver, we should change this 196 * function to skip registration of xo factor clocks. 197 */ 198 199 return _qcom_cc_register_board_clk(dev, path, name, rate, add_factor); 200 } 201 EXPORT_SYMBOL_GPL(qcom_cc_register_board_clk); 202 203 int qcom_cc_register_sleep_clk(struct device *dev) 204 { 205 return _qcom_cc_register_board_clk(dev, "sleep_clk", "sleep_clk_src", 206 32768, true); 207 } 208 EXPORT_SYMBOL_GPL(qcom_cc_register_sleep_clk); 209 210 static struct clk_hw *qcom_cc_clk_hw_get(struct of_phandle_args *clkspec, 211 void *data) 212 { 213 struct qcom_cc *cc = data; 214 unsigned int idx = clkspec->args[0]; 215 216 if (idx >= cc->num_rclks) { 217 pr_err("%s: invalid index %u\n", __func__, idx); 218 return ERR_PTR(-EINVAL); 219 } 220 221 return cc->rclks[idx] ? &cc->rclks[idx]->hw : ERR_PTR(-ENOENT); 222 } 223 224 int qcom_cc_really_probe(struct platform_device *pdev, 225 const struct qcom_cc_desc *desc, struct regmap *regmap) 226 { 227 int i, ret; 228 struct device *dev = &pdev->dev; 229 struct qcom_reset_controller *reset; 230 struct qcom_cc *cc; 231 struct gdsc_desc *scd; 232 size_t num_clks = desc->num_clks; 233 struct clk_regmap **rclks = desc->clks; 234 235 cc = devm_kzalloc(dev, sizeof(*cc), GFP_KERNEL); 236 if (!cc) 237 return -ENOMEM; 238 239 cc->rclks = rclks; 240 cc->num_rclks = num_clks; 241 242 for (i = 0; i < num_clks; i++) { 243 if (!rclks[i]) 244 continue; 245 246 ret = devm_clk_register_regmap(dev, rclks[i]); 247 if (ret) 248 return ret; 249 } 250 251 ret = of_clk_add_hw_provider(dev->of_node, qcom_cc_clk_hw_get, cc); 252 if (ret) 253 return ret; 254 255 ret = devm_add_action_or_reset(dev, qcom_cc_del_clk_provider, 256 pdev->dev.of_node); 257 258 if (ret) 259 return ret; 260 261 reset = &cc->reset; 262 reset->rcdev.of_node = dev->of_node; 263 reset->rcdev.ops = &qcom_reset_ops; 264 reset->rcdev.owner = dev->driver->owner; 265 reset->rcdev.nr_resets = desc->num_resets; 266 reset->regmap = regmap; 267 reset->reset_map = desc->resets; 268 269 ret = reset_controller_register(&reset->rcdev); 270 if (ret) 271 return ret; 272 273 ret = devm_add_action_or_reset(dev, qcom_cc_reset_unregister, 274 &reset->rcdev); 275 276 if (ret) 277 return ret; 278 279 if (desc->gdscs && desc->num_gdscs) { 280 scd = devm_kzalloc(dev, sizeof(*scd), GFP_KERNEL); 281 if (!scd) 282 return -ENOMEM; 283 scd->dev = dev; 284 scd->scs = desc->gdscs; 285 scd->num = desc->num_gdscs; 286 ret = gdsc_register(scd, &reset->rcdev, regmap); 287 if (ret) 288 return ret; 289 ret = devm_add_action_or_reset(dev, qcom_cc_gdsc_unregister, 290 scd); 291 if (ret) 292 return ret; 293 } 294 295 return 0; 296 } 297 EXPORT_SYMBOL_GPL(qcom_cc_really_probe); 298 299 int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc) 300 { 301 struct regmap *regmap; 302 303 regmap = qcom_cc_map(pdev, desc); 304 if (IS_ERR(regmap)) 305 return PTR_ERR(regmap); 306 307 return qcom_cc_really_probe(pdev, desc, regmap); 308 } 309 EXPORT_SYMBOL_GPL(qcom_cc_probe); 310 311 MODULE_LICENSE("GPL v2"); 312