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"); 336