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
  21 #include "common.h"
  22 #include "clk-rcg.h"
  23 #include "clk-regmap.h"
  24 #include "reset.h"
  25 #include "gdsc.h"
  26
  27 struct qcom_cc {
  28         struct qcom_reset_controller reset;
  29         struct clk_onecell_data data;
  30         struct clk *clks[];
  31 };
  32
  33 const
  34 struct freq_tbl *qcom_find_freq(const struct freq_tbl *f, unsigned long rate)
  35 {
  36         if (!f)
  37                 return NULL;
  38
  39         if (!f->freq)
  40                 return f;
  41
  42         for (; f->freq; f++)
  43                 if (rate <= f->freq)
  44                         return f;
  45
  46         /* Default to our fastest rate */
  47         return f - 1;
  48 }
  49 EXPORT_SYMBOL_GPL(qcom_find_freq);
  50
  51 int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src)
  52 {
  53         int i, num_parents = clk_hw_get_num_parents(hw);
  54
  55         for (i = 0; i < num_parents; i++)
  56                 if (src == map[i].src)
  57                         return i;
  58
  59         return -ENOENT;
  60 }
  61 EXPORT_SYMBOL_GPL(qcom_find_src_index);
  62
  63 struct regmap *
  64 qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc)
  65 {
  66         void __iomem *base;
  67         struct resource *res;
  68         struct device *dev = &pdev->dev;
  69
  70         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  71         base = devm_ioremap_resource(dev, res);
  72         if (IS_ERR(base))
  73                 return ERR_CAST(base);
  74
  75         return devm_regmap_init_mmio(dev, base, desc->config);
  76 }
  77 EXPORT_SYMBOL_GPL(qcom_cc_map);
  78
  79 static void qcom_cc_del_clk_provider(void *data)
  80 {
  81         of_clk_del_provider(data);
  82 }
  83
  84 static void qcom_cc_reset_unregister(void *data)
  85 {
  86         reset_controller_unregister(data);
  87 }
  88
  89 static void qcom_cc_gdsc_unregister(void *data)
  90 {
  91         gdsc_unregister(data);
  92 }
  93
  94 int qcom_cc_really_probe(struct platform_device *pdev,
  95                          const struct qcom_cc_desc *desc, struct regmap *regmap)
  96 {
  97         int i, ret;
  98         struct device *dev = &pdev->dev;
  99         struct clk *clk;
 100         struct clk_onecell_data *data;
 101         struct clk **clks;
 102         struct qcom_reset_controller *reset;
 103         struct qcom_cc *cc;
 104         size_t num_clks = desc->num_clks;
 105         struct clk_regmap **rclks = desc->clks;
 106
 107         cc = devm_kzalloc(dev, sizeof(*cc) + sizeof(*clks) * num_clks,
 108                           GFP_KERNEL);
 109         if (!cc)
 110                 return -ENOMEM;
 111
 112         clks = cc->clks;
 113         data = &cc->data;
 114         data->clks = clks;
 115         data->clk_num = num_clks;
 116
 117         for (i = 0; i < num_clks; i++) {
 118                 if (!rclks[i]) {
 119                         clks[i] = ERR_PTR(-ENOENT);
 120                         continue;
 121                 }
 122                 clk = devm_clk_register_regmap(dev, rclks[i]);
 123                 if (IS_ERR(clk))
 124                         return PTR_ERR(clk);
 125                 clks[i] = clk;
 126         }
 127
 128         ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get, data);
 129         if (ret)
 130                 return ret;
 131
 132         devm_add_action(dev, qcom_cc_del_clk_provider, pdev->dev.of_node);
 133
 134         reset = &cc->reset;
 135         reset->rcdev.of_node = dev->of_node;
 136         reset->rcdev.ops = &qcom_reset_ops;
 137         reset->rcdev.owner = dev->driver->owner;
 138         reset->rcdev.nr_resets = desc->num_resets;
 139         reset->regmap = regmap;
 140         reset->reset_map = desc->resets;
 141
 142         ret = reset_controller_register(&reset->rcdev);
 143         if (ret)
 144                 return ret;
 145
 146         devm_add_action(dev, qcom_cc_reset_unregister, &reset->rcdev);
 147
 148         if (desc->gdscs && desc->num_gdscs) {
 149                 ret = gdsc_register(dev, desc->gdscs, desc->num_gdscs,
 150                                     &reset->rcdev, regmap);
 151                 if (ret)
 152                         return ret;
 153         }
 154
 155         devm_add_action(dev, qcom_cc_gdsc_unregister, dev);
 156
 157
 158         return 0;
 159 }
 160 EXPORT_SYMBOL_GPL(qcom_cc_really_probe);
 161
 162 int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc)
 163 {
 164         struct regmap *regmap;
 165
 166         regmap = qcom_cc_map(pdev, desc);
 167         if (IS_ERR(regmap))
 168                 return PTR_ERR(regmap);
 169
 170         return qcom_cc_really_probe(pdev, desc, regmap);
 171 }
 172 EXPORT_SYMBOL_GPL(qcom_cc_probe);
 173
 174 MODULE_LICENSE("GPL v2");