kernel/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         int ret;
  62
  63         ret = regmap_update_bits(s2mps11->iodev->regmap_pmic,
  64                                  s2mps11->reg,
  65                                  s2mps11->mask, s2mps11->mask);
  66
  67         return ret;
  68 }
  69
  70 static void s2mps11_clk_unprepare(struct clk_hw *hw)
  71 {
  72         struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
  73         int ret;
  74
  75         ret = regmap_update_bits(s2mps11->iodev->regmap_pmic, s2mps11->reg,
  76                            s2mps11->mask, ~s2mps11->mask);
  77 }
  78
  79 static int s2mps11_clk_is_prepared(struct clk_hw *hw)
  80 {
  81         int ret;
  82         u32 val;
  83         struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
  84
  85         ret = regmap_read(s2mps11->iodev->regmap_pmic,
  86                                 s2mps11->reg, &val);
  87         if (ret < 0)
  88                 return -EINVAL;
  89
  90         return val & s2mps11->mask;
  91 }
  92
  93 static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw,
  94                                              unsigned long parent_rate)
  95 {
  96         return 32768;
  97 }
  98
  99 static struct clk_ops s2mps11_clk_ops = {
 100         .prepare        = s2mps11_clk_prepare,
 101         .unprepare      = s2mps11_clk_unprepare,
 102         .is_prepared    = s2mps11_clk_is_prepared,
 103         .recalc_rate    = s2mps11_clk_recalc_rate,
 104 };
 105
 106 static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = {
 107         [S2MPS11_CLK_AP] = {
 108                 .name = "s2mps11_ap",
 109                 .ops = &s2mps11_clk_ops,
 110                 .flags = CLK_IS_ROOT,
 111         },
 112         [S2MPS11_CLK_CP] = {
 113                 .name = "s2mps11_cp",
 114                 .ops = &s2mps11_clk_ops,
 115                 .flags = CLK_IS_ROOT,
 116         },
 117         [S2MPS11_CLK_BT] = {
 118                 .name = "s2mps11_bt",
 119                 .ops = &s2mps11_clk_ops,
 120                 .flags = CLK_IS_ROOT,
 121         },
 122 };
 123
 124 static struct clk_init_data s2mps13_clks_init[S2MPS11_CLKS_NUM] = {
 125         [S2MPS11_CLK_AP] = {
 126                 .name = "s2mps13_ap",
 127                 .ops = &s2mps11_clk_ops,
 128                 .flags = CLK_IS_ROOT,
 129         },
 130         [S2MPS11_CLK_CP] = {
 131                 .name = "s2mps13_cp",
 132                 .ops = &s2mps11_clk_ops,
 133                 .flags = CLK_IS_ROOT,
 134         },
 135         [S2MPS11_CLK_BT] = {
 136                 .name = "s2mps13_bt",
 137                 .ops = &s2mps11_clk_ops,
 138                 .flags = CLK_IS_ROOT,
 139         },
 140 };
 141
 142 static struct clk_init_data s2mps14_clks_init[S2MPS11_CLKS_NUM] = {
 143         [S2MPS11_CLK_AP] = {
 144                 .name = "s2mps14_ap",
 145                 .ops = &s2mps11_clk_ops,
 146                 .flags = CLK_IS_ROOT,
 147         },
 148         [S2MPS11_CLK_BT] = {
 149                 .name = "s2mps14_bt",
 150                 .ops = &s2mps11_clk_ops,
 151                 .flags = CLK_IS_ROOT,
 152         },
 153 };
 154
 155 static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev,
 156                 struct clk_init_data *clks_init)
 157 {
 158         struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 159         struct device_node *clk_np;
 160         int i;
 161
 162         if (!iodev->dev->of_node)
 163                 return ERR_PTR(-EINVAL);
 164
 165         clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks");
 166         if (!clk_np) {
 167                 dev_err(&pdev->dev, "could not find clock sub-node\n");
 168                 return ERR_PTR(-EINVAL);
 169         }
 170
 171         for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
 172                 if (!clks_init[i].name)
 173                         continue; /* Skip clocks not present in some devices */
 174                 of_property_read_string_index(clk_np, "clock-output-names", i,
 175                                 &clks_init[i].name);
 176         }
 177
 178         return clk_np;
 179 }
 180
 181 static int s2mps11_clk_probe(struct platform_device *pdev)
 182 {
 183         struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 184         struct s2mps11_clk *s2mps11_clks, *s2mps11_clk;
 185         unsigned int s2mps11_reg;
 186         struct clk_init_data *clks_init;
 187         int i, ret = 0;
 188
 189         s2mps11_clks = devm_kzalloc(&pdev->dev, sizeof(*s2mps11_clk) *
 190                                         S2MPS11_CLKS_NUM, GFP_KERNEL);
 191         if (!s2mps11_clks)
 192                 return -ENOMEM;
 193
 194         s2mps11_clk = s2mps11_clks;
 195
 196         clk_table = devm_kzalloc(&pdev->dev, sizeof(struct clk *) *
 197                                  S2MPS11_CLKS_NUM, GFP_KERNEL);
 198         if (!clk_table)
 199                 return -ENOMEM;
 200
 201         switch(platform_get_device_id(pdev)->driver_data) {
 202         case S2MPS11X:
 203                 s2mps11_reg = S2MPS11_REG_RTC_CTRL;
 204                 clks_init = s2mps11_clks_init;
 205                 break;
 206         case S2MPS13X:
 207                 s2mps11_reg = S2MPS13_REG_RTCCTRL;
 208                 clks_init = s2mps13_clks_init;
 209                 break;
 210         case S2MPS14X:
 211                 s2mps11_reg = S2MPS14_REG_RTCCTRL;
 212                 clks_init = s2mps14_clks_init;
 213                 break;
 214         case S5M8767X:
 215                 s2mps11_reg = S5M8767_REG_CTRL1;
 216                 clks_init = s2mps11_clks_init;
 217                 break;
 218         default:
 219                 dev_err(&pdev->dev, "Invalid device type\n");
 220                 return -EINVAL;
 221         }
 222
 223         /* Store clocks of_node in first element of s2mps11_clks array */
 224         s2mps11_clks->clk_np = s2mps11_clk_parse_dt(pdev, clks_init);
 225         if (IS_ERR(s2mps11_clks->clk_np))
 226                 return PTR_ERR(s2mps11_clks->clk_np);
 227
 228         for (i = 0; i < S2MPS11_CLKS_NUM; i++, s2mps11_clk++) {
 229                 if (!clks_init[i].name)
 230                         continue; /* Skip clocks not present in some devices */
 231                 s2mps11_clk->iodev = iodev;
 232                 s2mps11_clk->hw.init = &clks_init[i];
 233                 s2mps11_clk->mask = 1 << i;
 234                 s2mps11_clk->reg = s2mps11_reg;
 235
 236                 s2mps11_clk->clk = devm_clk_register(&pdev->dev,
 237                                                         &s2mps11_clk->hw);
 238                 if (IS_ERR(s2mps11_clk->clk)) {
 239                         dev_err(&pdev->dev, "Fail to register : %s\n",
 240                                                 s2mps11_name(s2mps11_clk));
 241                         ret = PTR_ERR(s2mps11_clk->clk);
 242                         goto err_reg;
 243                 }
 244
 245                 s2mps11_clk->lookup = clkdev_alloc(s2mps11_clk->clk,
 246                                         s2mps11_name(s2mps11_clk), NULL);
 247                 if (!s2mps11_clk->lookup) {
 248                         ret = -ENOMEM;
 249                         goto err_lup;
 250                 }
 251
 252                 clkdev_add(s2mps11_clk->lookup);
 253         }
 254
 255         for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
 256                 /* Skip clocks not present on S2MPS14 */
 257                 if (!clks_init[i].name)
 258                         continue;
 259                 clk_table[i] = s2mps11_clks[i].clk;
 260         }
 261
 262         clk_data.clks = clk_table;
 263         clk_data.clk_num = S2MPS11_CLKS_NUM;
 264         of_clk_add_provider(s2mps11_clks->clk_np, of_clk_src_onecell_get,
 265                         &clk_data);
 266
 267         platform_set_drvdata(pdev, s2mps11_clks);
 268
 269         return ret;
 270 err_lup:
 271         devm_clk_unregister(&pdev->dev, s2mps11_clk->clk);
 272 err_reg:
 273         while (s2mps11_clk > s2mps11_clks) {
 274                 if (s2mps11_clk->lookup) {
 275                         clkdev_drop(s2mps11_clk->lookup);
 276                         devm_clk_unregister(&pdev->dev, s2mps11_clk->clk);
 277                 }
 278                 s2mps11_clk--;
 279         }
 280
 281         return ret;
 282 }
 283
 284 static int s2mps11_clk_remove(struct platform_device *pdev)
 285 {
 286         struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev);
 287         int i;
 288
 289         of_clk_del_provider(s2mps11_clks[0].clk_np);
 290         /* Drop the reference obtained in s2mps11_clk_parse_dt */
 291         of_node_put(s2mps11_clks[0].clk_np);
 292
 293         for (i = 0; i < S2MPS11_CLKS_NUM; i++) {
 294                 /* Skip clocks not present on S2MPS14 */
 295                 if (!s2mps11_clks[i].lookup)
 296                         continue;
 297                 clkdev_drop(s2mps11_clks[i].lookup);
 298         }
 299
 300         return 0;
 301 }
 302
 303 static const struct platform_device_id s2mps11_clk_id[] = {
 304         { "s2mps11-clk", S2MPS11X},
 305         { "s2mps13-clk", S2MPS13X},
 306         { "s2mps14-clk", S2MPS14X},
 307         { "s5m8767-clk", S5M8767X},
 308         { },
 309 };
 310 MODULE_DEVICE_TABLE(platform, s2mps11_clk_id);
 311
 312 static struct platform_driver s2mps11_clk_driver = {
 313         .driver = {
 314                 .name  = "s2mps11-clk",
 315         },
 316         .probe = s2mps11_clk_probe,
 317         .remove = s2mps11_clk_remove,
 318         .id_table = s2mps11_clk_id,
 319 };
 320
 321 static int __init s2mps11_clk_init(void)
 322 {
 323         return platform_driver_register(&s2mps11_clk_driver);
 324 }
 325 subsys_initcall(s2mps11_clk_init);
 326
 327 static void __init s2mps11_clk_cleanup(void)
 328 {
 329         platform_driver_unregister(&s2mps11_clk_driver);
 330 }
 331 module_exit(s2mps11_clk_cleanup);
 332
 333 MODULE_DESCRIPTION("S2MPS11 Clock Driver");
 334 MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>");
 335 MODULE_LICENSE("GPL");