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