drivers/clk/qcom/common.c

   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 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_init_data init_data = { };
 106         int ret;
 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.ops = &clk_fixed_rate_ops;
 123
 124                 ret = devm_clk_hw_register(dev, &fixed->hw);
 125                 if (ret)
 126                         return ret;
 127         }
 128         of_node_put(node);
 129
 130         if (add_factor) {
 131                 factor = devm_kzalloc(dev, sizeof(*factor), GFP_KERNEL);
 132                 if (!factor)
 133                         return -EINVAL;
 134
 135                 factor->mult = factor->div = 1;
 136                 factor->hw.init = &init_data;
 137
 138                 init_data.name = name;
 139                 init_data.parent_names = &path;
 140                 init_data.num_parents = 1;
 141                 init_data.flags = 0;
 142                 init_data.ops = &clk_fixed_factor_ops;
 143
 144                 ret = devm_clk_hw_register(dev, &factor->hw);
 145                 if (ret)
 146                         return ret;
 147         }
 148
 149         return 0;
 150 }
 151
 152 int qcom_cc_register_board_clk(struct device *dev, const char *path,
 153                                const char *name, unsigned long rate)
 154 {
 155         bool add_factor = true;
 156         struct device_node *node;
 157
 158         /* The RPM clock driver will add the factor clock if present */
 159         if (IS_ENABLED(CONFIG_QCOM_RPMCC)) {
 160                 node = of_find_compatible_node(NULL, NULL, "qcom,rpmcc");
 161                 if (of_device_is_available(node))
 162                         add_factor = false;
 163                 of_node_put(node);
 164         }
 165
 166         return _qcom_cc_register_board_clk(dev, path, name, rate, add_factor);
 167 }
 168 EXPORT_SYMBOL_GPL(qcom_cc_register_board_clk);
 169
 170 int qcom_cc_register_sleep_clk(struct device *dev)
 171 {
 172         return _qcom_cc_register_board_clk(dev, "sleep_clk", "sleep_clk_src",
 173                                            32768, true);
 174 }
 175 EXPORT_SYMBOL_GPL(qcom_cc_register_sleep_clk);
 176
 177 static struct clk_hw *qcom_cc_clk_hw_get(struct of_phandle_args *clkspec,
 178                                          void *data)
 179 {
 180         struct qcom_cc *cc = data;
 181         unsigned int idx = clkspec->args[0];
 182
 183         if (idx >= cc->num_rclks) {
 184                 pr_err("%s: invalid index %u\n", __func__, idx);
 185                 return ERR_PTR(-EINVAL);
 186         }
 187
 188         return cc->rclks[idx] ? &cc->rclks[idx]->hw : ERR_PTR(-ENOENT);
 189 }
 190
 191 int qcom_cc_really_probe(struct platform_device *pdev,
 192                          const struct qcom_cc_desc *desc, struct regmap *regmap)
 193 {
 194         int i, ret;
 195         struct device *dev = &pdev->dev;
 196         struct qcom_reset_controller *reset;
 197         struct qcom_cc *cc;
 198         struct gdsc_desc *scd;
 199         size_t num_clks = desc->num_clks;
 200         struct clk_regmap **rclks = desc->clks;
 201
 202         cc = devm_kzalloc(dev, sizeof(*cc), GFP_KERNEL);
 203         if (!cc)
 204                 return -ENOMEM;
 205
 206         cc->rclks = rclks;
 207         cc->num_rclks = num_clks;
 208
 209         for (i = 0; i < num_clks; i++) {
 210                 if (!rclks[i])
 211                         continue;
 212
 213                 ret = devm_clk_register_regmap(dev, rclks[i]);
 214                 if (ret)
 215                         return ret;
 216         }
 217
 218         ret = of_clk_add_hw_provider(dev->of_node, qcom_cc_clk_hw_get, cc);
 219         if (ret)
 220                 return ret;
 221
 222         ret = devm_add_action_or_reset(dev, qcom_cc_del_clk_provider,
 223                                        pdev->dev.of_node);
 224
 225         if (ret)
 226                 return ret;
 227
 228         reset = &cc->reset;
 229         reset->rcdev.of_node = dev->of_node;
 230         reset->rcdev.ops = &qcom_reset_ops;
 231         reset->rcdev.owner = dev->driver->owner;
 232         reset->rcdev.nr_resets = desc->num_resets;
 233         reset->regmap = regmap;
 234         reset->reset_map = desc->resets;
 235
 236         ret = reset_controller_register(&reset->rcdev);
 237         if (ret)
 238                 return ret;
 239
 240         ret = devm_add_action_or_reset(dev, qcom_cc_reset_unregister,
 241                                        &reset->rcdev);
 242
 243         if (ret)
 244                 return ret;
 245
 246         if (desc->gdscs && desc->num_gdscs) {
 247                 scd = devm_kzalloc(dev, sizeof(*scd), GFP_KERNEL);
 248                 if (!scd)
 249                         return -ENOMEM;
 250                 scd->dev = dev;
 251                 scd->scs = desc->gdscs;
 252                 scd->num = desc->num_gdscs;
 253                 ret = gdsc_register(scd, &reset->rcdev, regmap);
 254                 if (ret)
 255                         return ret;
 256                 ret = devm_add_action_or_reset(dev, qcom_cc_gdsc_unregister,
 257                                                scd);
 258                 if (ret)
 259                         return ret;
 260         }
 261
 262         return 0;
 263 }
 264 EXPORT_SYMBOL_GPL(qcom_cc_really_probe);
 265
 266 int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc)
 267 {
 268         struct regmap *regmap;
 269
 270         regmap = qcom_cc_map(pdev, desc);
 271         if (IS_ERR(regmap))
 272                 return PTR_ERR(regmap);
 273
 274         return qcom_cc_really_probe(pdev, desc, regmap);
 275 }
 276 EXPORT_SYMBOL_GPL(qcom_cc_probe);
 277
 278 MODULE_LICENSE("GPL v2");