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 bool enabled; 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 if (!ret) 67 s2mps11->enabled = true; 68 69 return ret; 70 } 71 72 static void s2mps11_clk_unprepare(struct clk_hw *hw) 73 { 74 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); 75 int ret; 76 77 ret = regmap_update_bits(s2mps11->iodev->regmap_pmic, s2mps11->reg, 78 s2mps11->mask, ~s2mps11->mask); 79 80 if (!ret) 81 s2mps11->enabled = false; 82 } 83 84 static int s2mps11_clk_is_enabled(struct clk_hw *hw) 85 { 86 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); 87 88 return s2mps11->enabled; 89 } 90 91 static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw, 92 unsigned long parent_rate) 93 { 94 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); 95 if (s2mps11->enabled) 96 return 32768; 97 else 98 return 0; 99 } 100 101 static struct clk_ops s2mps11_clk_ops = { 102 .prepare = s2mps11_clk_prepare, 103 .unprepare = s2mps11_clk_unprepare, 104 .is_enabled = s2mps11_clk_is_enabled, 105 .recalc_rate = s2mps11_clk_recalc_rate, 106 }; 107 108 static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = { 109 [S2MPS11_CLK_AP] = { 110 .name = "s2mps11_ap", 111 .ops = &s2mps11_clk_ops, 112 .flags = CLK_IS_ROOT, 113 }, 114 [S2MPS11_CLK_CP] = { 115 .name = "s2mps11_cp", 116 .ops = &s2mps11_clk_ops, 117 .flags = CLK_IS_ROOT, 118 }, 119 [S2MPS11_CLK_BT] = { 120 .name = "s2mps11_bt", 121 .ops = &s2mps11_clk_ops, 122 .flags = CLK_IS_ROOT, 123 }, 124 }; 125 126 static struct clk_init_data s2mps14_clks_init[S2MPS11_CLKS_NUM] = { 127 [S2MPS11_CLK_AP] = { 128 .name = "s2mps14_ap", 129 .ops = &s2mps11_clk_ops, 130 .flags = CLK_IS_ROOT, 131 }, 132 [S2MPS11_CLK_BT] = { 133 .name = "s2mps14_bt", 134 .ops = &s2mps11_clk_ops, 135 .flags = CLK_IS_ROOT, 136 }, 137 }; 138 139 static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev, 140 struct clk_init_data *clks_init) 141 { 142 struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent); 143 struct device_node *clk_np; 144 int i; 145 146 if (!iodev->dev->of_node) 147 return ERR_PTR(-EINVAL); 148 149 clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks"); 150 if (!clk_np) { 151 dev_err(&pdev->dev, "could not find clock sub-node\n"); 152 return ERR_PTR(-EINVAL); 153 } 154 155 for (i = 0; i < S2MPS11_CLKS_NUM; i++) { 156 if (!clks_init[i].name) 157 continue; /* Skip clocks not present in some devices */ 158 of_property_read_string_index(clk_np, "clock-output-names", i, 159 &clks_init[i].name); 160 } 161 162 return clk_np; 163 } 164 165 static int s2mps11_clk_probe(struct platform_device *pdev) 166 { 167 struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent); 168 struct s2mps11_clk *s2mps11_clks, *s2mps11_clk; 169 unsigned int s2mps11_reg; 170 struct clk_init_data *clks_init; 171 int i, ret = 0; 172 u32 val; 173 174 s2mps11_clks = devm_kzalloc(&pdev->dev, sizeof(*s2mps11_clk) * 175 S2MPS11_CLKS_NUM, GFP_KERNEL); 176 if (!s2mps11_clks) 177 return -ENOMEM; 178 179 s2mps11_clk = s2mps11_clks; 180 181 clk_table = devm_kzalloc(&pdev->dev, sizeof(struct clk *) * 182 S2MPS11_CLKS_NUM, GFP_KERNEL); 183 if (!clk_table) 184 return -ENOMEM; 185 186 switch(platform_get_device_id(pdev)->driver_data) { 187 case S2MPS11X: 188 s2mps11_reg = S2MPS11_REG_RTC_CTRL; 189 clks_init = s2mps11_clks_init; 190 break; 191 case S2MPS14X: 192 s2mps11_reg = S2MPS14_REG_RTCCTRL; 193 clks_init = s2mps14_clks_init; 194 break; 195 case S5M8767X: 196 s2mps11_reg = S5M8767_REG_CTRL1; 197 clks_init = s2mps11_clks_init; 198 break; 199 default: 200 dev_err(&pdev->dev, "Invalid device type\n"); 201 return -EINVAL; 202 }; 203 204 /* Store clocks of_node in first element of s2mps11_clks array */ 205 s2mps11_clks->clk_np = s2mps11_clk_parse_dt(pdev, clks_init); 206 if (IS_ERR(s2mps11_clks->clk_np)) 207 return PTR_ERR(s2mps11_clks->clk_np); 208 209 for (i = 0; i < S2MPS11_CLKS_NUM; i++, s2mps11_clk++) { 210 if (!clks_init[i].name) 211 continue; /* Skip clocks not present in some devices */ 212 s2mps11_clk->iodev = iodev; 213 s2mps11_clk->hw.init = &clks_init[i]; 214 s2mps11_clk->mask = 1 << i; 215 s2mps11_clk->reg = s2mps11_reg; 216 217 ret = regmap_read(s2mps11_clk->iodev->regmap_pmic, 218 s2mps11_clk->reg, &val); 219 if (ret < 0) 220 goto err_reg; 221 222 s2mps11_clk->enabled = val & s2mps11_clk->mask; 223 224 s2mps11_clk->clk = devm_clk_register(&pdev->dev, 225 &s2mps11_clk->hw); 226 if (IS_ERR(s2mps11_clk->clk)) { 227 dev_err(&pdev->dev, "Fail to register : %s\n", 228 s2mps11_name(s2mps11_clk)); 229 ret = PTR_ERR(s2mps11_clk->clk); 230 goto err_reg; 231 } 232 233 s2mps11_clk->lookup = clkdev_alloc(s2mps11_clk->clk, 234 s2mps11_name(s2mps11_clk), NULL); 235 if (!s2mps11_clk->lookup) { 236 ret = -ENOMEM; 237 goto err_lup; 238 } 239 240 clkdev_add(s2mps11_clk->lookup); 241 } 242 243 for (i = 0; i < S2MPS11_CLKS_NUM; i++) { 244 /* Skip clocks not present on S2MPS14 */ 245 if (!clks_init[i].name) 246 continue; 247 clk_table[i] = s2mps11_clks[i].clk; 248 } 249 250 clk_data.clks = clk_table; 251 clk_data.clk_num = S2MPS11_CLKS_NUM; 252 of_clk_add_provider(s2mps11_clks->clk_np, of_clk_src_onecell_get, 253 &clk_data); 254 255 platform_set_drvdata(pdev, s2mps11_clks); 256 257 return ret; 258 err_lup: 259 devm_clk_unregister(&pdev->dev, s2mps11_clk->clk); 260 err_reg: 261 while (s2mps11_clk > s2mps11_clks) { 262 if (s2mps11_clk->lookup) { 263 clkdev_drop(s2mps11_clk->lookup); 264 devm_clk_unregister(&pdev->dev, s2mps11_clk->clk); 265 } 266 s2mps11_clk--; 267 } 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 { "s2mps14-clk", S2MPS14X}, 294 { "s5m8767-clk", S5M8767X}, 295 { }, 296 }; 297 MODULE_DEVICE_TABLE(platform, s2mps11_clk_id); 298 299 static struct platform_driver s2mps11_clk_driver = { 300 .driver = { 301 .name = "s2mps11-clk", 302 .owner = THIS_MODULE, 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 __init 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"); 324