1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved. 4 */ 5 6 #include <linux/export.h> 7 #include <linux/module.h> 8 #include <linux/regmap.h> 9 #include <linux/platform_device.h> 10 #include <linux/clk-provider.h> 11 #include <linux/reset-controller.h> 12 #include <linux/of.h> 13 14 #include "common.h" 15 #include "clk-rcg.h" 16 #include "clk-regmap.h" 17 #include "reset.h" 18 #include "gdsc.h" 19 20 struct qcom_cc { 21 struct qcom_reset_controller reset; 22 struct clk_regmap **rclks; 23 size_t num_rclks; 24 }; 25 26 const 27 struct freq_tbl *qcom_find_freq(const struct freq_tbl *f, unsigned long rate) 28 { 29 if (!f) 30 return NULL; 31 32 for (; f->freq; f++) 33 if (rate <= f->freq) 34 return f; 35 36 /* Default to our fastest rate */ 37 return f - 1; 38 } 39 EXPORT_SYMBOL_GPL(qcom_find_freq); 40 41 const struct freq_tbl *qcom_find_freq_floor(const struct freq_tbl *f, 42 unsigned long rate) 43 { 44 const struct freq_tbl *best = NULL; 45 46 for ( ; f->freq; f++) { 47 if (rate >= f->freq) 48 best = f; 49 else 50 break; 51 } 52 53 return best; 54 } 55 EXPORT_SYMBOL_GPL(qcom_find_freq_floor); 56 57 int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src) 58 { 59 int i, num_parents = clk_hw_get_num_parents(hw); 60 61 for (i = 0; i < num_parents; i++) 62 if (src == map[i].src) 63 return i; 64 65 return -ENOENT; 66 } 67 EXPORT_SYMBOL_GPL(qcom_find_src_index); 68 69 struct regmap * 70 qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc) 71 { 72 void __iomem *base; 73 struct resource *res; 74 struct device *dev = &pdev->dev; 75 76 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 77 base = devm_ioremap_resource(dev, res); 78 if (IS_ERR(base)) 79 return ERR_CAST(base); 80 81 return devm_regmap_init_mmio(dev, base, desc->config); 82 } 83 EXPORT_SYMBOL_GPL(qcom_cc_map); 84 85 void 86 qcom_pll_set_fsm_mode(struct regmap *map, u32 reg, u8 bias_count, u8 lock_count) 87 { 88 u32 val; 89 u32 mask; 90 91 /* De-assert reset to FSM */ 92 regmap_update_bits(map, reg, PLL_VOTE_FSM_RESET, 0); 93 94 /* Program bias count and lock count */ 95 val = bias_count << PLL_BIAS_COUNT_SHIFT | 96 lock_count << PLL_LOCK_COUNT_SHIFT; 97 mask = PLL_BIAS_COUNT_MASK << PLL_BIAS_COUNT_SHIFT; 98 mask |= PLL_LOCK_COUNT_MASK << PLL_LOCK_COUNT_SHIFT; 99 regmap_update_bits(map, reg, mask, val); 100 101 /* Enable PLL FSM voting */ 102 regmap_update_bits(map, reg, PLL_VOTE_FSM_ENA, PLL_VOTE_FSM_ENA); 103 } 104 EXPORT_SYMBOL_GPL(qcom_pll_set_fsm_mode); 105 106 static void qcom_cc_gdsc_unregister(void *data) 107 { 108 gdsc_unregister(data); 109 } 110 111 /* 112 * Backwards compatibility with old DTs. Register a pass-through factor 1/1 113 * clock to translate 'path' clk into 'name' clk and register the 'path' 114 * clk as a fixed rate clock if it isn't present. 115 */ 116 static int _qcom_cc_register_board_clk(struct device *dev, const char *path, 117 const char *name, unsigned long rate, 118 bool add_factor) 119 { 120 struct device_node *node = NULL; 121 struct device_node *clocks_node; 122 struct clk_fixed_factor *factor; 123 struct clk_fixed_rate *fixed; 124 struct clk_init_data init_data = { }; 125 int ret; 126 127 clocks_node = of_find_node_by_path("/clocks"); 128 if (clocks_node) { 129 node = of_get_child_by_name(clocks_node, path); 130 of_node_put(clocks_node); 131 } 132 133 if (!node) { 134 fixed = devm_kzalloc(dev, sizeof(*fixed), GFP_KERNEL); 135 if (!fixed) 136 return -EINVAL; 137 138 fixed->fixed_rate = rate; 139 fixed->hw.init = &init_data; 140 141 init_data.name = path; 142 init_data.ops = &clk_fixed_rate_ops; 143 144 ret = devm_clk_hw_register(dev, &fixed->hw); 145 if (ret) 146 return ret; 147 } 148 of_node_put(node); 149 150 if (add_factor) { 151 factor = devm_kzalloc(dev, sizeof(*factor), GFP_KERNEL); 152 if (!factor) 153 return -EINVAL; 154 155 factor->mult = factor->div = 1; 156 factor->hw.init = &init_data; 157 158 init_data.name = name; 159 init_data.parent_names = &path; 160 init_data.num_parents = 1; 161 init_data.flags = 0; 162 init_data.ops = &clk_fixed_factor_ops; 163 164 ret = devm_clk_hw_register(dev, &factor->hw); 165 if (ret) 166 return ret; 167 } 168 169 return 0; 170 } 171 172 int qcom_cc_register_board_clk(struct device *dev, const char *path, 173 const char *name, unsigned long rate) 174 { 175 bool add_factor = true; 176 177 /* 178 * TODO: The RPM clock driver currently does not support the xo clock. 179 * When xo is added to the RPM clock driver, we should change this 180 * function to skip registration of xo factor clocks. 181 */ 182 183 return _qcom_cc_register_board_clk(dev, path, name, rate, add_factor); 184 } 185 EXPORT_SYMBOL_GPL(qcom_cc_register_board_clk); 186 187 int qcom_cc_register_sleep_clk(struct device *dev) 188 { 189 return _qcom_cc_register_board_clk(dev, "sleep_clk", "sleep_clk_src", 190 32768, true); 191 } 192 EXPORT_SYMBOL_GPL(qcom_cc_register_sleep_clk); 193 194 /* Drop 'protected-clocks' from the list of clocks to register */ 195 static void qcom_cc_drop_protected(struct device *dev, struct qcom_cc *cc) 196 { 197 struct device_node *np = dev->of_node; 198 struct property *prop; 199 const __be32 *p; 200 u32 i; 201 202 of_property_for_each_u32(np, "protected-clocks", prop, p, i) { 203 if (i >= cc->num_rclks) 204 continue; 205 206 cc->rclks[i] = NULL; 207 } 208 } 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 reset = &cc->reset; 240 reset->rcdev.of_node = dev->of_node; 241 reset->rcdev.ops = &qcom_reset_ops; 242 reset->rcdev.owner = dev->driver->owner; 243 reset->rcdev.nr_resets = desc->num_resets; 244 reset->regmap = regmap; 245 reset->reset_map = desc->resets; 246 247 ret = devm_reset_controller_register(dev, &reset->rcdev); 248 if (ret) 249 return ret; 250 251 if (desc->gdscs && desc->num_gdscs) { 252 scd = devm_kzalloc(dev, sizeof(*scd), GFP_KERNEL); 253 if (!scd) 254 return -ENOMEM; 255 scd->dev = dev; 256 scd->scs = desc->gdscs; 257 scd->num = desc->num_gdscs; 258 ret = gdsc_register(scd, &reset->rcdev, regmap); 259 if (ret) 260 return ret; 261 ret = devm_add_action_or_reset(dev, qcom_cc_gdsc_unregister, 262 scd); 263 if (ret) 264 return ret; 265 } 266 267 cc->rclks = rclks; 268 cc->num_rclks = num_clks; 269 270 qcom_cc_drop_protected(dev, cc); 271 272 for (i = 0; i < num_clks; i++) { 273 if (!rclks[i]) 274 continue; 275 276 ret = devm_clk_register_regmap(dev, rclks[i]); 277 if (ret) 278 return ret; 279 } 280 281 ret = devm_of_clk_add_hw_provider(dev, qcom_cc_clk_hw_get, cc); 282 if (ret) 283 return ret; 284 285 return 0; 286 } 287 EXPORT_SYMBOL_GPL(qcom_cc_really_probe); 288 289 int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc) 290 { 291 struct regmap *regmap; 292 293 regmap = qcom_cc_map(pdev, desc); 294 if (IS_ERR(regmap)) 295 return PTR_ERR(regmap); 296 297 return qcom_cc_really_probe(pdev, desc, regmap); 298 } 299 EXPORT_SYMBOL_GPL(qcom_cc_probe); 300 301 MODULE_LICENSE("GPL v2"); 302