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"); 313