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