drivers/clk/meson/meson-aoclk.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Amlogic Meson-AXG Clock Controller Driver
   4  *
   5  * Copyright (c) 2016 BayLibre, SAS.
   6  * Author: Neil Armstrong <narmstrong@baylibre.com>
   7  *
   8  * Copyright (c) 2018 Amlogic, inc.
   9  * Author: Qiufang Dai <qiufang.dai@amlogic.com>
  10  * Author: Yixun Lan <yixun.lan@amlogic.com>
  11  */
  12
  13 #include <linux/platform_device.h>
  14 #include <linux/reset-controller.h>
  15 #include <linux/mfd/syscon.h>
  16 #include <linux/of_device.h>
  17 #include <linux/slab.h>
  18 #include "meson-aoclk.h"
  19
  20 #include "clk-input.h"
  21
  22 static int meson_aoclk_do_reset(struct reset_controller_dev *rcdev,
  23                                unsigned long id)
  24 {
  25         struct meson_aoclk_reset_controller *rstc =
  26                 container_of(rcdev, struct meson_aoclk_reset_controller, reset);
  27
  28         return regmap_write(rstc->regmap, rstc->data->reset_reg,
  29                             BIT(rstc->data->reset[id]));
  30 }
  31
  32 static const struct reset_control_ops meson_aoclk_reset_ops = {
  33         .reset = meson_aoclk_do_reset,
  34 };
  35
  36 static int meson_aoclkc_register_inputs(struct device *dev,
  37                                         struct meson_aoclk_data *data)
  38 {
  39         struct clk_hw *hw;
  40         char *str;
  41         int i;
  42
  43         for (i = 0; i < data->num_inputs; i++) {
  44                 const struct meson_aoclk_input *in = &data->inputs[i];
  45
  46                 str = kasprintf(GFP_KERNEL, "%s%s", data->input_prefix,
  47                                 in->name);
  48                 if (!str)
  49                         return -ENOMEM;
  50
  51                 hw = meson_clk_hw_register_input(dev, in->name, str, 0);
  52                 kfree(str);
  53
  54                 if (IS_ERR(hw)) {
  55                         if (!in->required && PTR_ERR(hw) == -ENOENT)
  56                                 continue;
  57                         else if (PTR_ERR(hw) != -EPROBE_DEFER)
  58                                 dev_err(dev, "failed to register input %s\n",
  59                                         in->name);
  60                         return PTR_ERR(hw);
  61                 }
  62         }
  63
  64         return 0;
  65 }
  66
  67 int meson_aoclkc_probe(struct platform_device *pdev)
  68 {
  69         struct meson_aoclk_reset_controller *rstc;
  70         struct meson_aoclk_data *data;
  71         struct device *dev = &pdev->dev;
  72         struct regmap *regmap;
  73         int ret, clkid;
  74
  75         data = (struct meson_aoclk_data *) of_device_get_match_data(dev);
  76         if (!data)
  77                 return -ENODEV;
  78
  79         rstc = devm_kzalloc(dev, sizeof(*rstc), GFP_KERNEL);
  80         if (!rstc)
  81                 return -ENOMEM;
  82
  83         regmap = syscon_node_to_regmap(of_get_parent(dev->of_node));
  84         if (IS_ERR(regmap)) {
  85                 dev_err(dev, "failed to get regmap\n");
  86                 return PTR_ERR(regmap);
  87         }
  88
  89         ret = meson_aoclkc_register_inputs(dev, data);
  90         if (ret)
  91                 return ret;
  92
  93         /* Reset Controller */
  94         rstc->data = data;
  95         rstc->regmap = regmap;
  96         rstc->reset.ops = &meson_aoclk_reset_ops;
  97         rstc->reset.nr_resets = data->num_reset,
  98         rstc->reset.of_node = dev->of_node;
  99         ret = devm_reset_controller_register(dev, &rstc->reset);
 100         if (ret) {
 101                 dev_err(dev, "failed to register reset controller\n");
 102                 return ret;
 103         }
 104
 105         /* Populate regmap */
 106         for (clkid = 0; clkid < data->num_clks; clkid++)
 107                 data->clks[clkid]->map = regmap;
 108
 109         /* Register all clks */
 110         for (clkid = 0; clkid < data->hw_data->num; clkid++) {
 111                 if (!data->hw_data->hws[clkid])
 112                         continue;
 113
 114                 ret = devm_clk_hw_register(dev, data->hw_data->hws[clkid]);
 115                 if (ret) {
 116                         dev_err(dev, "Clock registration failed\n");
 117                         return ret;
 118                 }
 119         }
 120
 121         return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
 122                 (void *) data->hw_data);
 123 }