drivers/clk/clk-s2mps11.c

   1 /*
   2  * clk-s2mps11.c - Clock driver for S2MPS11.
   3  *
   4  * Copyright (C) 2013,2014 Samsung Electornics
   5  *
   6  * This program is free software; you can redistribute  it and/or modify it
   7  * under  the terms of  the GNU General  Public License as published by the
   8  * Free Software Foundation;  either version 2 of the  License, or (at your
   9  * option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/err.h>
  20 #include <linux/of.h>
  21 #include <linux/clkdev.h>
  22 #include <linux/regmap.h>
  23 #include <linux/clk-provider.h>
  24 #include <linux/platform_device.h>
  25 #include <linux/mfd/samsung/s2mps11.h>
  26 #include <linux/mfd/samsung/s2mps13.h>
  27 #include <linux/mfd/samsung/s2mps14.h>
  28 #include <linux/mfd/samsung/s5m8767.h>
  29 #include <linux/mfd/samsung/core.h>
  30
  31 #define s2mps11_name(a) (a->hw.init->name)
  32
  33 static struct clk **clk_table;
  34 static struct clk_onecell_data clk_data;
  35
  36 enum {
  37         S2MPS11_CLK_AP = 0,
  38         S2MPS11_CLK_CP,
  39         S2MPS11_CLK_BT,
  40         S2MPS11_CLKS_NUM,
  41 };
  42
  43 struct s2mps11_clk {
  44         struct sec_pmic_dev *iodev;
  45         struct device_node *clk_np;
  46         struct clk_hw hw;
  47         struct clk *clk;
  48         struct clk_lookup *lookup;
  49         u32 mask;
  50         unsigned int reg;
  51 };
  52
  53 static struct s2mps11_clk *to_s2mps11_clk(struct clk_hw *hw)
  54 {
  55         return container_of(hw, struct s2mps11_clk, hw);
  56 }
  57
  58 static int s2mps11_clk_prepare(struct clk_hw *hw)
  59 {
  60         struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
  61
  62         return regmap_update_bits(s2mps11->iodev->regmap_pmic,
  63                                  s2mps11->reg,
  64                                  s2mps11->mask, s2mps11->mask);
  65 }
  66
  67 static void s2mps11_clk_unprepare(struct clk_hw *hw)
  68 {
  69         struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
  70
  71         regmap_update_bits(s2mps11->iodev->regmap_pmic, s2mps11->reg,
  72                            s2mps11->mask, ~s2mps11->mask);
  73 }
  74
  75 static int s2mps11_clk_is_prepared(struct clk_hw *hw)
  76 {
  77         int ret;
  78         u32 val;
  79         struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
  80
  81         ret = regmap_read(s2mps11->iodev->regmap_pmic,
  82                                 s2mps11->reg, &val);
  83         if (ret < 0)
  84                 return -EINVAL;
  85
  86         return val & s2mps11->mask;
  87 }
  88
  89 static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw,
  90                                              unsigned long parent_rate)
  91 {
  92         return 32768;
  93 }
  94
  95 static struct clk_ops s2mps11_clk_ops = {
  96         .prepare        = s2mps11_clk_prepare,
  97         .unprepare      = s2mps11_clk_unprepare,
  98         .is_prepared    = s2mps11_clk_is_prepared,
  99         .recalc_rate    = s2mps11_clk_recalc_rate,
 100 };
 101
 102 static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = {
 103         [S2MPS11_CLK_AP] = {
 104                 .name = "s2mps11_ap",
 105                 .ops = &s2mps11_clk_ops,
 106                 .flags = CLK_IS_ROOT,
 107         },
 108         [S2MPS11_CLK_CP] = {
 109                 .name = "s2mps11_cp",
 110                 .ops = &s2mps11_clk_ops,
 111                 .flags = CLK_IS_ROOT,
 112         },
 113         [S2MPS11_CLK_BT] = {
 114                 .name = "s2mps11_bt",
 115                 .ops = &s2mps11_clk_ops,
 116                 .flags = CLK_IS_ROOT,
 117         },
 118 };
 119
 120 static struct clk_init_data s2mps13_clks_init[S2MPS11_CLKS_NUM] = {
 121         [S2MPS11_CLK_AP] = {
 122                 .name = "s2mps13_ap",
 123                 .ops = &s2mps11_clk_ops,
 124                 .flags = CLK_IS_ROOT,
 125         },
 126         [S2MPS11_CLK_CP] = {
 127                 .name = "s2mps13_cp",
 128                 .ops = &s2mps11_clk_ops,
 129                 .flags = CLK_IS_ROOT,
 130         },
 131         [S2MPS11_CLK_BT] = {
 132                 .name = "s2mps13_bt",
 133                 .ops = &s2mps11_clk_ops,
 134                 .flags = CLK_IS_ROOT,
 135         },
 136 };
 137
 138 static struct clk_init_data s2mps14_clks_init[S2MPS11_CLKS_NUM] = {
 139         [S2MPS11_CLK_AP] = {
 140                 .name = "s2mps14_ap",
 141                 .ops = &s2mps11_clk_ops,
 142                 .flags = CLK_IS_ROOT,
 143         },
 144         [S2MPS11_CLK_BT] = {
 145                 .name = "s2mps14_bt",
 146                 .ops = &s2mps11_clk_ops,
 147                 .flags = CLK_IS_ROOT,
 148         },
 149 };
 150
 151 static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev,
 152                 struct clk_init_data *clks_init)
 153 {
 154         struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 155         struct device_node *clk_np;
 156         int i;
 157
 158         if (!iodev->dev->of_node)
 159                 return ERR_PTR(-EINVAL);
 160
 161         clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks");
 162         if (!clk_np) {
 163                 dev_err(&pdev->dev, "could not find clock sub-node\n");
 164                 return ERR_PTR(-EINVAL);
 165         }
 166
 167         for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
 168                 if (!clks_init[i].name)
 169                         continue; /* Skip clocks not present in some devices */
 170                 of_property_read_string_index(clk_np, "clock-output-names", i,
 171                                 &clks_init[i].name);
 172         }
 173
 174         return clk_np;
 175 }
 176
 177 static int s2mps11_clk_probe(struct platform_device *pdev)
 178 {
 179         struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 180         struct s2mps11_clk *s2mps11_clks, *s2mps11_clk;
 181         unsigned int s2mps11_reg;
 182         struct clk_init_data *clks_init;
 183         int i, ret = 0;
 184
 185         s2mps11_clks = devm_kcalloc(&pdev->dev, S2MPS11_CLKS_NUM,
 186                                 sizeof(*s2mps11_clk), GFP_KERNEL);
 187         if (!s2mps11_clks)
 188                 return -ENOMEM;
 189
 190         s2mps11_clk = s2mps11_clks;
 191
 192         clk_table = devm_kcalloc(&pdev->dev, S2MPS11_CLKS_NUM,
 193                                 sizeof(struct clk *), GFP_KERNEL);
 194         if (!clk_table)
 195                 return -ENOMEM;
 196
 197         switch(platform_get_device_id(pdev)->driver_data) {
 198         case S2MPS11X:
 199                 s2mps11_reg = S2MPS11_REG_RTC_CTRL;
 200                 clks_init = s2mps11_clks_init;
 201                 break;
 202         case S2MPS13X:
 203                 s2mps11_reg = S2MPS13_REG_RTCCTRL;
 204                 clks_init = s2mps13_clks_init;
 205                 break;
 206         case S2MPS14X:
 207                 s2mps11_reg = S2MPS14_REG_RTCCTRL;
 208                 clks_init = s2mps14_clks_init;
 209                 break;
 210         case S5M8767X:
 211                 s2mps11_reg = S5M8767_REG_CTRL1;
 212                 clks_init = s2mps11_clks_init;
 213                 break;
 214         default:
 215                 dev_err(&pdev->dev, "Invalid device type\n");
 216                 return -EINVAL;
 217         }
 218
 219         /* Store clocks of_node in first element of s2mps11_clks array */
 220         s2mps11_clks->clk_np = s2mps11_clk_parse_dt(pdev, clks_init);
 221         if (IS_ERR(s2mps11_clks->clk_np))
 222                 return PTR_ERR(s2mps11_clks->clk_np);
 223
 224         for (i = 0; i < S2MPS11_CLKS_NUM; i++, s2mps11_clk++) {
 225                 if (!clks_init[i].name)
 226                         continue; /* Skip clocks not present in some devices */
 227                 s2mps11_clk->iodev = iodev;
 228                 s2mps11_clk->hw.init = &clks_init[i];
 229                 s2mps11_clk->mask = 1 << i;
 230                 s2mps11_clk->reg = s2mps11_reg;
 231
 232                 s2mps11_clk->clk = devm_clk_register(&pdev->dev,
 233                                                         &s2mps11_clk->hw);
 234                 if (IS_ERR(s2mps11_clk->clk)) {
 235                         dev_err(&pdev->dev, "Fail to register : %s\n",
 236                                                 s2mps11_name(s2mps11_clk));
 237                         ret = PTR_ERR(s2mps11_clk->clk);
 238                         goto err_reg;
 239                 }
 240
 241                 s2mps11_clk->lookup = clkdev_create(s2mps11_clk->clk,
 242                                         s2mps11_name(s2mps11_clk), NULL);
 243                 if (!s2mps11_clk->lookup) {
 244                         ret = -ENOMEM;
 245                         goto err_reg;
 246                 }
 247         }
 248
 249         for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
 250                 /* Skip clocks not present on S2MPS14 */
 251                 if (!clks_init[i].name)
 252                         continue;
 253                 clk_table[i] = s2mps11_clks[i].clk;
 254         }
 255
 256         clk_data.clks = clk_table;
 257         clk_data.clk_num = S2MPS11_CLKS_NUM;
 258         of_clk_add_provider(s2mps11_clks->clk_np, of_clk_src_onecell_get,
 259                         &clk_data);
 260
 261         platform_set_drvdata(pdev, s2mps11_clks);
 262
 263         return ret;
 264
 265 err_reg:
 266         while (--i >= 0)
 267                 clkdev_drop(s2mps11_clks[i].lookup);
 268
 269         return ret;
 270 }
 271
 272 static int s2mps11_clk_remove(struct platform_device *pdev)
 273 {
 274         struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev);
 275         int i;
 276
 277         of_clk_del_provider(s2mps11_clks[0].clk_np);
 278         /* Drop the reference obtained in s2mps11_clk_parse_dt */
 279         of_node_put(s2mps11_clks[0].clk_np);
 280
 281         for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
 282                 /* Skip clocks not present on S2MPS14 */
 283                 if (!s2mps11_clks[i].lookup)
 284                         continue;
 285                 clkdev_drop(s2mps11_clks[i].lookup);
 286         }
 287
 288         return 0;
 289 }
 290
 291 static const struct platform_device_id s2mps11_clk_id[] = {
 292         { "s2mps11-clk", S2MPS11X},
 293         { "s2mps13-clk", S2MPS13X},
 294         { "s2mps14-clk", S2MPS14X},
 295         { "s5m8767-clk", S5M8767X},
 296         { },
 297 };
 298 MODULE_DEVICE_TABLE(platform, s2mps11_clk_id);
 299
 300 static struct platform_driver s2mps11_clk_driver = {
 301         .driver = {
 302                 .name  = "s2mps11-clk",
 303         },
 304         .probe = s2mps11_clk_probe,
 305         .remove = s2mps11_clk_remove,
 306         .id_table = s2mps11_clk_id,
 307 };
 308
 309 static int __init s2mps11_clk_init(void)
 310 {
 311         return platform_driver_register(&s2mps11_clk_driver);
 312 }
 313 subsys_initcall(s2mps11_clk_init);
 314
 315 static void __exit s2mps11_clk_cleanup(void)
 316 {
 317         platform_driver_unregister(&s2mps11_clk_driver);
 318 }
 319 module_exit(s2mps11_clk_cleanup);
 320
 321 MODULE_DESCRIPTION("S2MPS11 Clock Driver");
 322 MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>");
 323 MODULE_LICENSE("GPL");