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