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/regmap.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/clk-provider.h>
  18 #include <linux/reset-controller.h>
  19
  20 #include "common.h"
  21 #include "clk-rcg.h"
  22 #include "clk-regmap.h"
  23 #include "reset.h"
  24
  25 struct qcom_cc {
  26         struct qcom_reset_controller reset;
  27         struct clk_onecell_data data;
  28         struct clk *clks[];
  29 };
  30
  31 const
  32 struct freq_tbl *qcom_find_freq(const struct freq_tbl *f, unsigned long rate)
  33 {
  34         if (!f)
  35                 return NULL;
  36
  37         for (; f->freq; f++)
  38                 if (rate <= f->freq)
  39                         return f;
  40
  41         /* Default to our fastest rate */
  42         return f - 1;
  43 }
  44 EXPORT_SYMBOL_GPL(qcom_find_freq);
  45
  46 int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src)
  47 {
  48         int i, num_parents = __clk_get_num_parents(hw->clk);
  49
  50         for (i = 0; i < num_parents; i++)
  51                 if (src == map[i].src)
  52                         return i;
  53
  54         return -ENOENT;
  55 }
  56 EXPORT_SYMBOL_GPL(qcom_find_src_index);
  57
  58 struct regmap *
  59 qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc)
  60 {
  61         void __iomem *base;
  62         struct resource *res;
  63         struct device *dev = &pdev->dev;
  64
  65         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  66         base = devm_ioremap_resource(dev, res);
  67         if (IS_ERR(base))
  68                 return ERR_CAST(base);
  69
  70         return devm_regmap_init_mmio(dev, base, desc->config);
  71 }
  72 EXPORT_SYMBOL_GPL(qcom_cc_map);
  73
  74 int qcom_cc_really_probe(struct platform_device *pdev,
  75                          const struct qcom_cc_desc *desc, struct regmap *regmap)
  76 {
  77         int i, ret;
  78         struct device *dev = &pdev->dev;
  79         struct clk *clk;
  80         struct clk_onecell_data *data;
  81         struct clk **clks;
  82         struct qcom_reset_controller *reset;
  83         struct qcom_cc *cc;
  84         size_t num_clks = desc->num_clks;
  85         struct clk_regmap **rclks = desc->clks;
  86
  87         cc = devm_kzalloc(dev, sizeof(*cc) + sizeof(*clks) * num_clks,
  88                           GFP_KERNEL);
  89         if (!cc)
  90                 return -ENOMEM;
  91
  92         clks = cc->clks;
  93         data = &cc->data;
  94         data->clks = clks;
  95         data->clk_num = num_clks;
  96
  97         for (i = 0; i < num_clks; i++) {
  98                 if (!rclks[i]) {
  99                         clks[i] = ERR_PTR(-ENOENT);
 100                         continue;
 101                 }
 102                 clk = devm_clk_register_regmap(dev, rclks[i]);
 103                 if (IS_ERR(clk))
 104                         return PTR_ERR(clk);
 105                 clks[i] = clk;
 106         }
 107
 108         ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get, data);
 109         if (ret)
 110                 return ret;
 111
 112         reset = &cc->reset;
 113         reset->rcdev.of_node = dev->of_node;
 114         reset->rcdev.ops = &qcom_reset_ops;
 115         reset->rcdev.owner = dev->driver->owner;
 116         reset->rcdev.nr_resets = desc->num_resets;
 117         reset->regmap = regmap;
 118         reset->reset_map = desc->resets;
 119         platform_set_drvdata(pdev, &reset->rcdev);
 120
 121         ret = reset_controller_register(&reset->rcdev);
 122         if (ret)
 123                 of_clk_del_provider(dev->of_node);
 124
 125         return ret;
 126 }
 127 EXPORT_SYMBOL_GPL(qcom_cc_really_probe);
 128
 129 int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc)
 130 {
 131         struct regmap *regmap;
 132
 133         regmap = qcom_cc_map(pdev, desc);
 134         if (IS_ERR(regmap))
 135                 return PTR_ERR(regmap);
 136
 137         return qcom_cc_really_probe(pdev, desc, regmap);
 138 }
 139 EXPORT_SYMBOL_GPL(qcom_cc_probe);
 140
 141 void qcom_cc_remove(struct platform_device *pdev)
 142 {
 143         of_clk_del_provider(pdev->dev.of_node);
 144         reset_controller_unregister(platform_get_drvdata(pdev));
 145 }
 146 EXPORT_SYMBOL_GPL(qcom_cc_remove);