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-regmap.h"
  22 #include "reset.h"
  23
  24 struct qcom_cc {
  25         struct qcom_reset_controller reset;
  26         struct clk_onecell_data data;
  27         struct clk *clks[];
  28 };
  29
  30 struct regmap *
  31 qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc)
  32 {
  33         void __iomem *base;
  34         struct resource *res;
  35         struct device *dev = &pdev->dev;
  36
  37         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  38         base = devm_ioremap_resource(dev, res);
  39         if (IS_ERR(base))
  40                 return ERR_CAST(base);
  41
  42         return devm_regmap_init_mmio(dev, base, desc->config);
  43 }
  44 EXPORT_SYMBOL_GPL(qcom_cc_map);
  45
  46 int qcom_cc_really_probe(struct platform_device *pdev,
  47                          const struct qcom_cc_desc *desc, struct regmap *regmap)
  48 {
  49         int i, ret;
  50         struct device *dev = &pdev->dev;
  51         struct clk *clk;
  52         struct clk_onecell_data *data;
  53         struct clk **clks;
  54         struct qcom_reset_controller *reset;
  55         struct qcom_cc *cc;
  56         size_t num_clks = desc->num_clks;
  57         struct clk_regmap **rclks = desc->clks;
  58
  59         cc = devm_kzalloc(dev, sizeof(*cc) + sizeof(*clks) * num_clks,
  60                           GFP_KERNEL);
  61         if (!cc)
  62                 return -ENOMEM;
  63
  64         clks = cc->clks;
  65         data = &cc->data;
  66         data->clks = clks;
  67         data->clk_num = num_clks;
  68
  69         for (i = 0; i < num_clks; i++) {
  70                 if (!rclks[i]) {
  71                         clks[i] = ERR_PTR(-ENOENT);
  72                         continue;
  73                 }
  74                 clk = devm_clk_register_regmap(dev, rclks[i]);
  75                 if (IS_ERR(clk))
  76                         return PTR_ERR(clk);
  77                 clks[i] = clk;
  78         }
  79
  80         ret = of_clk_add_provider(dev->of_node, of_clk_src_onecell_get, data);
  81         if (ret)
  82                 return ret;
  83
  84         reset = &cc->reset;
  85         reset->rcdev.of_node = dev->of_node;
  86         reset->rcdev.ops = &qcom_reset_ops;
  87         reset->rcdev.owner = dev->driver->owner;
  88         reset->rcdev.nr_resets = desc->num_resets;
  89         reset->regmap = regmap;
  90         reset->reset_map = desc->resets;
  91         platform_set_drvdata(pdev, &reset->rcdev);
  92
  93         ret = reset_controller_register(&reset->rcdev);
  94         if (ret)
  95                 of_clk_del_provider(dev->of_node);
  96
  97         return ret;
  98 }
  99 EXPORT_SYMBOL_GPL(qcom_cc_really_probe);
 100
 101 int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc)
 102 {
 103         struct regmap *regmap;
 104
 105         regmap = qcom_cc_map(pdev, desc);
 106         if (IS_ERR(regmap))
 107                 return PTR_ERR(regmap);
 108
 109         return qcom_cc_really_probe(pdev, desc, regmap);
 110 }
 111 EXPORT_SYMBOL_GPL(qcom_cc_probe);
 112
 113 void qcom_cc_remove(struct platform_device *pdev)
 114 {
 115         of_clk_del_provider(pdev->dev.of_node);
 116         reset_controller_unregister(platform_get_drvdata(pdev));
 117 }
 118 EXPORT_SYMBOL_GPL(qcom_cc_remove);