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 int qcom_cc_really_probe(struct platform_device *pdev,
  77                          const struct qcom_cc_desc *desc, struct regmap *regmap)
  78 {
  79         int i, ret;
  80         struct device *dev = &pdev->dev;
  81         struct clk *clk;
  82         struct clk_onecell_data *data;
  83         struct clk **clks;
  84         struct qcom_reset_controller *reset;
  85         struct qcom_cc *cc;
  86         size_t num_clks = desc->num_clks;
  87         struct clk_regmap **rclks = desc->clks;
  88
  89         cc = devm_kzalloc(dev, sizeof(*cc) + sizeof(*clks) * num_clks,
  90                           GFP_KERNEL);
  91         if (!cc)
  92                 return -ENOMEM;
  93
  94         clks = cc->clks;
  95         data = &cc->data;
  96         data->clks = clks;
  97         data->clk_num = num_clks;
  98
  99         for (i = 0; i < num_clks; i++) {
 100                 if (!rclks[i]) {
 101                         clks[i] = ERR_PTR(-ENOENT);
 102                         continue;
 103                 }
 104                 clk = devm_clk_register_regmap(dev, rclks[i]);
 105                 if (IS_ERR(clk))
 106                         return PTR_ERR(clk);
 107                 clks[i] = clk;
 108         }
 109
 110         ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get, data);
 111         if (ret)
 112                 return ret;
 113
 114         reset = &cc->reset;
 115         reset->rcdev.of_node = dev->of_node;
 116         reset->rcdev.ops = &qcom_reset_ops;
 117         reset->rcdev.owner = dev->driver->owner;
 118         reset->rcdev.nr_resets = desc->num_resets;
 119         reset->regmap = regmap;
 120         reset->reset_map = desc->resets;
 121         platform_set_drvdata(pdev, &reset->rcdev);
 122
 123         ret = reset_controller_register(&reset->rcdev);
 124         if (ret)
 125                 goto err_reset;
 126
 127         if (desc->gdscs && desc->num_gdscs) {
 128                 ret = gdsc_register(dev, desc->gdscs, desc->num_gdscs,
 129                                     &reset->rcdev, regmap);
 130                 if (ret)
 131                         goto err_pd;
 132         }
 133
 134         return 0;
 135 err_pd:
 136         reset_controller_unregister(&reset->rcdev);
 137 err_reset:
 138         of_clk_del_provider(dev->of_node);
 139         return ret;
 140 }
 141 EXPORT_SYMBOL_GPL(qcom_cc_really_probe);
 142
 143 int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc)
 144 {
 145         struct regmap *regmap;
 146
 147         regmap = qcom_cc_map(pdev, desc);
 148         if (IS_ERR(regmap))
 149                 return PTR_ERR(regmap);
 150
 151         return qcom_cc_really_probe(pdev, desc, regmap);
 152 }
 153 EXPORT_SYMBOL_GPL(qcom_cc_probe);
 154
 155 void qcom_cc_remove(struct platform_device *pdev)
 156 {
 157         gdsc_unregister(&pdev->dev);
 158         of_clk_del_provider(pdev->dev.of_node);
 159         reset_controller_unregister(platform_get_drvdata(pdev));
 160 }
 161 EXPORT_SYMBOL_GPL(qcom_cc_remove);
 162
 163 MODULE_LICENSE("GPL v2");