drivers/clk/uniphier/clk-uniphier-core.c

   1 /*
   2  * Copyright (C) 2016 Socionext Inc.
   3  *   Author: Masahiro Yamada <yamada.masahiro@socionext.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  */
  15
  16 #include <linux/clk-provider.h>
  17 #include <linux/init.h>
  18 #include <linux/mfd/syscon.h>
  19 #include <linux/of.h>
  20 #include <linux/of_device.h>
  21 #include <linux/platform_device.h>
  22
  23 #include "clk-uniphier.h"
  24
  25 static struct clk_hw *uniphier_clk_register(struct device *dev,
  26                                             struct regmap *regmap,
  27                                         const struct uniphier_clk_data *data)
  28 {
  29         switch (data->type) {
  30         case UNIPHIER_CLK_TYPE_FIXED_FACTOR:
  31                 return uniphier_clk_register_fixed_factor(dev, data->name,
  32                                                           &data->data.factor);
  33         case UNIPHIER_CLK_TYPE_FIXED_RATE:
  34                 return uniphier_clk_register_fixed_rate(dev, data->name,
  35                                                         &data->data.rate);
  36         case UNIPHIER_CLK_TYPE_GATE:
  37                 return uniphier_clk_register_gate(dev, regmap, data->name,
  38                                                   &data->data.gate);
  39         case UNIPHIER_CLK_TYPE_MUX:
  40                 return uniphier_clk_register_mux(dev, regmap, data->name,
  41                                                  &data->data.mux);
  42         default:
  43                 dev_err(dev, "unsupported clock type\n");
  44                 return ERR_PTR(-EINVAL);
  45         }
  46 }
  47
  48 static int uniphier_clk_probe(struct platform_device *pdev)
  49 {
  50         struct device *dev = &pdev->dev;
  51         struct clk_hw_onecell_data *hw_data;
  52         const struct uniphier_clk_data *p, *data;
  53         struct regmap *regmap;
  54         struct device_node *parent;
  55         int clk_num = 0;
  56
  57         data = of_device_get_match_data(dev);
  58         if (WARN_ON(!data))
  59                 return -EINVAL;
  60
  61         parent = of_get_parent(dev->of_node); /* parent should be syscon node */
  62         regmap = syscon_node_to_regmap(parent);
  63         of_node_put(parent);
  64         if (IS_ERR(regmap)) {
  65                 dev_err(dev, "failed to get regmap (error %ld)\n",
  66                         PTR_ERR(regmap));
  67                 return PTR_ERR(regmap);
  68         }
  69
  70         for (p = data; p->name; p++)
  71                 clk_num = max(clk_num, p->idx + 1);
  72
  73         hw_data = devm_kzalloc(dev,
  74                         sizeof(*hw_data) + clk_num * sizeof(struct clk_hw *),
  75                         GFP_KERNEL);
  76         if (!hw_data)
  77                 return -ENOMEM;
  78
  79         hw_data->num = clk_num;
  80
  81         /* avoid returning NULL for unused idx */
  82         while (--clk_num >= 0)
  83                 hw_data->hws[clk_num] = ERR_PTR(-EINVAL);
  84
  85         for (p = data; p->name; p++) {
  86                 struct clk_hw *hw;
  87
  88                 dev_dbg(dev, "register %s (index=%d)\n", p->name, p->idx);
  89                 hw = uniphier_clk_register(dev, regmap, p);
  90                 if (IS_ERR(hw)) {
  91                         dev_err(dev, "failed to register %s (error %ld)\n",
  92                                 p->name, PTR_ERR(hw));
  93                         return PTR_ERR(hw);
  94                 }
  95
  96                 if (p->idx >= 0)
  97                         hw_data->hws[p->idx] = hw;
  98         }
  99
 100         return of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
 101                                       hw_data);
 102 }
 103
 104 static int uniphier_clk_remove(struct platform_device *pdev)
 105 {
 106         of_clk_del_provider(pdev->dev.of_node);
 107
 108         return 0;
 109 }
 110
 111 static const struct of_device_id uniphier_clk_match[] = {
 112         /* System clock */
 113         {
 114                 .compatible = "socionext,uniphier-sld3-clock",
 115                 .data = uniphier_sld3_sys_clk_data,
 116         },
 117         {
 118                 .compatible = "socionext,uniphier-ld4-clock",
 119                 .data = uniphier_ld4_sys_clk_data,
 120         },
 121         {
 122                 .compatible = "socionext,uniphier-pro4-clock",
 123                 .data = uniphier_pro4_sys_clk_data,
 124         },
 125         {
 126                 .compatible = "socionext,uniphier-sld8-clock",
 127                 .data = uniphier_sld8_sys_clk_data,
 128         },
 129         {
 130                 .compatible = "socionext,uniphier-pro5-clock",
 131                 .data = uniphier_pro5_sys_clk_data,
 132         },
 133         {
 134                 .compatible = "socionext,uniphier-pxs2-clock",
 135                 .data = uniphier_pxs2_sys_clk_data,
 136         },
 137         {
 138                 .compatible = "socionext,uniphier-ld11-clock",
 139                 .data = uniphier_ld11_sys_clk_data,
 140         },
 141         {
 142                 .compatible = "socionext,uniphier-ld20-clock",
 143                 .data = uniphier_ld20_sys_clk_data,
 144         },
 145         /* Media I/O clock, SD clock */
 146         {
 147                 .compatible = "socionext,uniphier-sld3-mio-clock",
 148                 .data = uniphier_sld3_mio_clk_data,
 149         },
 150         {
 151                 .compatible = "socionext,uniphier-ld4-mio-clock",
 152                 .data = uniphier_sld3_mio_clk_data,
 153         },
 154         {
 155                 .compatible = "socionext,uniphier-pro4-mio-clock",
 156                 .data = uniphier_sld3_mio_clk_data,
 157         },
 158         {
 159                 .compatible = "socionext,uniphier-sld8-mio-clock",
 160                 .data = uniphier_sld3_mio_clk_data,
 161         },
 162         {
 163                 .compatible = "socionext,uniphier-pro5-sd-clock",
 164                 .data = uniphier_pro5_sd_clk_data,
 165         },
 166         {
 167                 .compatible = "socionext,uniphier-pxs2-sd-clock",
 168                 .data = uniphier_pro5_sd_clk_data,
 169         },
 170         {
 171                 .compatible = "socionext,uniphier-ld11-mio-clock",
 172                 .data = uniphier_sld3_mio_clk_data,
 173         },
 174         {
 175                 .compatible = "socionext,uniphier-ld20-sd-clock",
 176                 .data = uniphier_pro5_sd_clk_data,
 177         },
 178         /* Peripheral clock */
 179         {
 180                 .compatible = "socionext,uniphier-ld4-peri-clock",
 181                 .data = uniphier_ld4_peri_clk_data,
 182         },
 183         {
 184                 .compatible = "socionext,uniphier-pro4-peri-clock",
 185                 .data = uniphier_pro4_peri_clk_data,
 186         },
 187         {
 188                 .compatible = "socionext,uniphier-sld8-peri-clock",
 189                 .data = uniphier_ld4_peri_clk_data,
 190         },
 191         {
 192                 .compatible = "socionext,uniphier-pro5-peri-clock",
 193                 .data = uniphier_pro4_peri_clk_data,
 194         },
 195         {
 196                 .compatible = "socionext,uniphier-pxs2-peri-clock",
 197                 .data = uniphier_pro4_peri_clk_data,
 198         },
 199         {
 200                 .compatible = "socionext,uniphier-ld11-peri-clock",
 201                 .data = uniphier_pro4_peri_clk_data,
 202         },
 203         {
 204                 .compatible = "socionext,uniphier-ld20-peri-clock",
 205                 .data = uniphier_pro4_peri_clk_data,
 206         },
 207         { /* sentinel */ }
 208 };
 209
 210 static struct platform_driver uniphier_clk_driver = {
 211         .probe = uniphier_clk_probe,
 212         .remove = uniphier_clk_remove,
 213         .driver = {
 214                 .name = "uniphier-clk",
 215                 .of_match_table = uniphier_clk_match,
 216         },
 217 };
 218 builtin_platform_driver(uniphier_clk_driver);