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         if (!f->freq)
  41                 return f;
  42
  43         for (; f->freq; f++)
  44                 if (rate <= f->freq)
  45                         return f;
  46
  47         /* Default to our fastest rate */
  48         return f - 1;
  49 }
  50 EXPORT_SYMBOL_GPL(qcom_find_freq);
  51
  52 const struct freq_tbl *qcom_find_freq_floor(const struct freq_tbl *f,
  53                                             unsigned long rate)
  54 {
  55         const struct freq_tbl *best = NULL;
  56
  57         for ( ; f->freq; f++) {
  58                 if (rate >= f->freq)
  59                         best = f;
  60                 else
  61                         break;
  62         }
  63
  64         return best;
  65 }
  66 EXPORT_SYMBOL_GPL(qcom_find_freq_floor);
  67
  68 int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src)
  69 {
  70         int i, num_parents = clk_hw_get_num_parents(hw);
  71
  72         for (i = 0; i < num_parents; i++)
  73                 if (src == map[i].src)
  74                         return i;
  75
  76         return -ENOENT;
  77 }
  78 EXPORT_SYMBOL_GPL(qcom_find_src_index);
  79
  80 struct regmap *
  81 qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc)
  82 {
  83         void __iomem *base;
  84         struct resource *res;
  85         struct device *dev = &pdev->dev;
  86
  87         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  88         base = devm_ioremap_resource(dev, res);
  89         if (IS_ERR(base))
  90                 return ERR_CAST(base);
  91
  92         return devm_regmap_init_mmio(dev, base, desc->config);
  93 }
  94 EXPORT_SYMBOL_GPL(qcom_cc_map);
  95
  96 void
  97 qcom_pll_set_fsm_mode(struct regmap *map, u32 reg, u8 bias_count, u8 lock_count)
  98 {
  99         u32 val;
 100         u32 mask;
 101
 102         /* De-assert reset to FSM */
 103         regmap_update_bits(map, reg, PLL_VOTE_FSM_RESET, 0);
 104
 105         /* Program bias count and lock count */
 106         val = bias_count << PLL_BIAS_COUNT_SHIFT |
 107                 lock_count << PLL_LOCK_COUNT_SHIFT;
 108         mask = PLL_BIAS_COUNT_MASK << PLL_BIAS_COUNT_SHIFT;
 109         mask |= PLL_LOCK_COUNT_MASK << PLL_LOCK_COUNT_SHIFT;
 110         regmap_update_bits(map, reg, mask, val);
 111
 112         /* Enable PLL FSM voting */
 113         regmap_update_bits(map, reg, PLL_VOTE_FSM_ENA, PLL_VOTE_FSM_ENA);
 114 }
 115 EXPORT_SYMBOL_GPL(qcom_pll_set_fsm_mode);
 116
 117 static void qcom_cc_gdsc_unregister(void *data)
 118 {
 119         gdsc_unregister(data);
 120 }
 121
 122 /*
 123  * Backwards compatibility with old DTs. Register a pass-through factor 1/1
 124  * clock to translate 'path' clk into 'name' clk and register the 'path'
 125  * clk as a fixed rate clock if it isn't present.
 126  */
 127 static int _qcom_cc_register_board_clk(struct device *dev, const char *path,
 128                                        const char *name, unsigned long rate,
 129                                        bool add_factor)
 130 {
 131         struct device_node *node = NULL;
 132         struct device_node *clocks_node;
 133         struct clk_fixed_factor *factor;
 134         struct clk_fixed_rate *fixed;
 135         struct clk_init_data init_data = { };
 136         int ret;
 137
 138         clocks_node = of_find_node_by_path("/clocks");
 139         if (clocks_node) {
 140                 node = of_get_child_by_name(clocks_node, path);
 141                 of_node_put(clocks_node);
 142         }
 143
 144         if (!node) {
 145                 fixed = devm_kzalloc(dev, sizeof(*fixed), GFP_KERNEL);
 146                 if (!fixed)
 147                         return -EINVAL;
 148
 149                 fixed->fixed_rate = rate;
 150                 fixed->hw.init = &init_data;
 151
 152                 init_data.name = path;
 153                 init_data.ops = &clk_fixed_rate_ops;
 154
 155                 ret = devm_clk_hw_register(dev, &fixed->hw);
 156                 if (ret)
 157                         return ret;
 158         }
 159         of_node_put(node);
 160
 161         if (add_factor) {
 162                 factor = devm_kzalloc(dev, sizeof(*factor), GFP_KERNEL);
 163                 if (!factor)
 164                         return -EINVAL;
 165
 166                 factor->mult = factor->div = 1;
 167                 factor->hw.init = &init_data;
 168
 169                 init_data.name = name;
 170                 init_data.parent_names = &path;
 171                 init_data.num_parents = 1;
 172                 init_data.flags = 0;
 173                 init_data.ops = &clk_fixed_factor_ops;
 174
 175                 ret = devm_clk_hw_register(dev, &factor->hw);
 176                 if (ret)
 177                         return ret;
 178         }
 179
 180         return 0;
 181 }
 182
 183 int qcom_cc_register_board_clk(struct device *dev, const char *path,
 184                                const char *name, unsigned long rate)
 185 {
 186         bool add_factor = true;
 187
 188         /*
 189          * TODO: The RPM clock driver currently does not support the xo clock.
 190          * When xo is added to the RPM clock driver, we should change this
 191          * function to skip registration of xo factor clocks.
 192          */
 193
 194         return _qcom_cc_register_board_clk(dev, path, name, rate, add_factor);
 195 }
 196 EXPORT_SYMBOL_GPL(qcom_cc_register_board_clk);
 197
 198 int qcom_cc_register_sleep_clk(struct device *dev)
 199 {
 200         return _qcom_cc_register_board_clk(dev, "sleep_clk", "sleep_clk_src",
 201                                            32768, true);
 202 }
 203 EXPORT_SYMBOL_GPL(qcom_cc_register_sleep_clk);
 204
 205 static struct clk_hw *qcom_cc_clk_hw_get(struct of_phandle_args *clkspec,
 206                                          void *data)
 207 {
 208         struct qcom_cc *cc = data;
 209         unsigned int idx = clkspec->args[0];
 210
 211         if (idx >= cc->num_rclks) {
 212                 pr_err("%s: invalid index %u\n", __func__, idx);
 213                 return ERR_PTR(-EINVAL);
 214         }
 215
 216         return cc->rclks[idx] ? &cc->rclks[idx]->hw : ERR_PTR(-ENOENT);
 217 }
 218
 219 int qcom_cc_really_probe(struct platform_device *pdev,
 220                          const struct qcom_cc_desc *desc, struct regmap *regmap)
 221 {
 222         int i, ret;
 223         struct device *dev = &pdev->dev;
 224         struct qcom_reset_controller *reset;
 225         struct qcom_cc *cc;
 226         struct gdsc_desc *scd;
 227         size_t num_clks = desc->num_clks;
 228         struct clk_regmap **rclks = desc->clks;
 229
 230         cc = devm_kzalloc(dev, sizeof(*cc), GFP_KERNEL);
 231         if (!cc)
 232                 return -ENOMEM;
 233
 234         cc->rclks = rclks;
 235         cc->num_rclks = num_clks;
 236
 237         for (i = 0; i < num_clks; i++) {
 238                 if (!rclks[i])
 239                         continue;
 240
 241                 ret = devm_clk_register_regmap(dev, rclks[i]);
 242                 if (ret)
 243                         return ret;
 244         }
 245
 246         ret = devm_of_clk_add_hw_provider(dev, qcom_cc_clk_hw_get, cc);
 247         if (ret)
 248                 return ret;
 249
 250         reset = &cc->reset;
 251         reset->rcdev.of_node = dev->of_node;
 252         reset->rcdev.ops = &qcom_reset_ops;
 253         reset->rcdev.owner = dev->driver->owner;
 254         reset->rcdev.nr_resets = desc->num_resets;
 255         reset->regmap = regmap;
 256         reset->reset_map = desc->resets;
 257
 258         ret = devm_reset_controller_register(dev, &reset->rcdev);
 259         if (ret)
 260                 return ret;
 261
 262         if (desc->gdscs && desc->num_gdscs) {
 263                 scd = devm_kzalloc(dev, sizeof(*scd), GFP_KERNEL);
 264                 if (!scd)
 265                         return -ENOMEM;
 266                 scd->dev = dev;
 267                 scd->scs = desc->gdscs;
 268                 scd->num = desc->num_gdscs;
 269                 ret = gdsc_register(scd, &reset->rcdev, regmap);
 270                 if (ret)
 271                         return ret;
 272                 ret = devm_add_action_or_reset(dev, qcom_cc_gdsc_unregister,
 273                                                scd);
 274                 if (ret)
 275                         return ret;
 276         }
 277
 278         return 0;
 279 }
 280 EXPORT_SYMBOL_GPL(qcom_cc_really_probe);
 281
 282 int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc)
 283 {
 284         struct regmap *regmap;
 285
 286         regmap = qcom_cc_map(pdev, desc);
 287         if (IS_ERR(regmap))
 288                 return PTR_ERR(regmap);
 289
 290         return qcom_cc_really_probe(pdev, desc, regmap);
 291 }
 292 EXPORT_SYMBOL_GPL(qcom_cc_probe);
 293
 294 MODULE_LICENSE("GPL v2");