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"); 324