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