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