1 /* 2 * clk-s2mps11.c - Clock driver for S2MPS11. 3 * 4 * Copyright (C) 2013 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 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 #include <linux/module.h> 23 #include <linux/err.h> 24 #include <linux/of.h> 25 #include <linux/clkdev.h> 26 #include <linux/regmap.h> 27 #include <linux/clk-provider.h> 28 #include <linux/platform_device.h> 29 #include <linux/mfd/samsung/s2mps11.h> 30 #include <linux/mfd/samsung/s5m8767.h> 31 #include <linux/mfd/samsung/core.h> 32 33 #define s2mps11_name(a) (a->hw.init->name) 34 35 static struct clk **clk_table; 36 static struct clk_onecell_data clk_data; 37 38 enum { 39 S2MPS11_CLK_AP = 0, 40 S2MPS11_CLK_CP, 41 S2MPS11_CLK_BT, 42 S2MPS11_CLKS_NUM, 43 }; 44 45 struct s2mps11_clk { 46 struct sec_pmic_dev *iodev; 47 struct clk_hw hw; 48 struct clk *clk; 49 struct clk_lookup *lookup; 50 u32 mask; 51 bool enabled; 52 unsigned int reg; 53 }; 54 55 static struct s2mps11_clk *to_s2mps11_clk(struct clk_hw *hw) 56 { 57 return container_of(hw, struct s2mps11_clk, hw); 58 } 59 60 static int s2mps11_clk_prepare(struct clk_hw *hw) 61 { 62 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); 63 int ret; 64 65 ret = regmap_update_bits(s2mps11->iodev->regmap_pmic, 66 s2mps11->reg, 67 s2mps11->mask, s2mps11->mask); 68 if (!ret) 69 s2mps11->enabled = true; 70 71 return ret; 72 } 73 74 static void s2mps11_clk_unprepare(struct clk_hw *hw) 75 { 76 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); 77 int ret; 78 79 ret = regmap_update_bits(s2mps11->iodev->regmap_pmic, s2mps11->reg, 80 s2mps11->mask, ~s2mps11->mask); 81 82 if (!ret) 83 s2mps11->enabled = false; 84 } 85 86 static int s2mps11_clk_is_enabled(struct clk_hw *hw) 87 { 88 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); 89 90 return s2mps11->enabled; 91 } 92 93 static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw, 94 unsigned long parent_rate) 95 { 96 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); 97 if (s2mps11->enabled) 98 return 32768; 99 else 100 return 0; 101 } 102 103 static struct clk_ops s2mps11_clk_ops = { 104 .prepare = s2mps11_clk_prepare, 105 .unprepare = s2mps11_clk_unprepare, 106 .is_enabled = s2mps11_clk_is_enabled, 107 .recalc_rate = s2mps11_clk_recalc_rate, 108 }; 109 110 static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = { 111 [S2MPS11_CLK_AP] = { 112 .name = "s2mps11_ap", 113 .ops = &s2mps11_clk_ops, 114 .flags = CLK_IS_ROOT, 115 }, 116 [S2MPS11_CLK_CP] = { 117 .name = "s2mps11_cp", 118 .ops = &s2mps11_clk_ops, 119 .flags = CLK_IS_ROOT, 120 }, 121 [S2MPS11_CLK_BT] = { 122 .name = "s2mps11_bt", 123 .ops = &s2mps11_clk_ops, 124 .flags = CLK_IS_ROOT, 125 }, 126 }; 127 128 static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev) 129 { 130 struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent); 131 struct device_node *clk_np; 132 int i; 133 134 if (!iodev->dev->of_node) 135 return ERR_PTR(-EINVAL); 136 137 clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks"); 138 if (!clk_np) { 139 dev_err(&pdev->dev, "could not find clock sub-node\n"); 140 return ERR_PTR(-EINVAL); 141 } 142 143 clk_table = devm_kzalloc(&pdev->dev, sizeof(struct clk *) * 144 S2MPS11_CLKS_NUM, GFP_KERNEL); 145 if (!clk_table) 146 return ERR_PTR(-ENOMEM); 147 148 for (i = 0; i < S2MPS11_CLKS_NUM; i++) 149 of_property_read_string_index(clk_np, "clock-output-names", i, 150 &s2mps11_clks_init[i].name); 151 152 return clk_np; 153 } 154 155 static int s2mps11_clk_probe(struct platform_device *pdev) 156 { 157 struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent); 158 struct s2mps11_clk *s2mps11_clks, *s2mps11_clk; 159 struct device_node *clk_np = NULL; 160 unsigned int s2mps11_reg; 161 int i, ret = 0; 162 u32 val; 163 164 s2mps11_clks = devm_kzalloc(&pdev->dev, sizeof(*s2mps11_clk) * 165 S2MPS11_CLKS_NUM, GFP_KERNEL); 166 if (!s2mps11_clks) 167 return -ENOMEM; 168 169 s2mps11_clk = s2mps11_clks; 170 171 clk_np = s2mps11_clk_parse_dt(pdev); 172 if (IS_ERR(clk_np)) 173 return PTR_ERR(clk_np); 174 175 switch(platform_get_device_id(pdev)->driver_data) { 176 case S2MPS11X: 177 s2mps11_reg = S2MPS11_REG_RTC_CTRL; 178 break; 179 case S5M8767X: 180 s2mps11_reg = S5M8767_REG_CTRL1; 181 break; 182 default: 183 dev_err(&pdev->dev, "Invalid device type\n"); 184 return -EINVAL; 185 }; 186 187 for (i = 0; i < S2MPS11_CLKS_NUM; i++, s2mps11_clk++) { 188 s2mps11_clk->iodev = iodev; 189 s2mps11_clk->hw.init = &s2mps11_clks_init[i]; 190 s2mps11_clk->mask = 1 << i; 191 s2mps11_clk->reg = s2mps11_reg; 192 193 ret = regmap_read(s2mps11_clk->iodev->regmap_pmic, 194 s2mps11_clk->reg, &val); 195 if (ret < 0) 196 goto err_reg; 197 198 s2mps11_clk->enabled = val & s2mps11_clk->mask; 199 200 s2mps11_clk->clk = devm_clk_register(&pdev->dev, 201 &s2mps11_clk->hw); 202 if (IS_ERR(s2mps11_clk->clk)) { 203 dev_err(&pdev->dev, "Fail to register : %s\n", 204 s2mps11_name(s2mps11_clk)); 205 ret = PTR_ERR(s2mps11_clk->clk); 206 goto err_reg; 207 } 208 209 s2mps11_clk->lookup = devm_kzalloc(&pdev->dev, 210 sizeof(struct clk_lookup), GFP_KERNEL); 211 if (!s2mps11_clk->lookup) { 212 ret = -ENOMEM; 213 goto err_lup; 214 } 215 216 s2mps11_clk->lookup->con_id = s2mps11_name(s2mps11_clk); 217 s2mps11_clk->lookup->clk = s2mps11_clk->clk; 218 219 clkdev_add(s2mps11_clk->lookup); 220 } 221 222 if (clk_table) { 223 for (i = 0; i < S2MPS11_CLKS_NUM; i++) 224 clk_table[i] = s2mps11_clks[i].clk; 225 226 clk_data.clks = clk_table; 227 clk_data.clk_num = S2MPS11_CLKS_NUM; 228 of_clk_add_provider(clk_np, of_clk_src_onecell_get, &clk_data); 229 } 230 231 platform_set_drvdata(pdev, s2mps11_clks); 232 233 return ret; 234 err_lup: 235 devm_clk_unregister(&pdev->dev, s2mps11_clk->clk); 236 err_reg: 237 while (s2mps11_clk > s2mps11_clks) { 238 if (s2mps11_clk->lookup) { 239 clkdev_drop(s2mps11_clk->lookup); 240 devm_clk_unregister(&pdev->dev, s2mps11_clk->clk); 241 } 242 s2mps11_clk--; 243 } 244 245 return ret; 246 } 247 248 static int s2mps11_clk_remove(struct platform_device *pdev) 249 { 250 struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev); 251 int i; 252 253 for (i = 0; i < S2MPS11_CLKS_NUM; i++) 254 clkdev_drop(s2mps11_clks[i].lookup); 255 256 return 0; 257 } 258 259 static const struct platform_device_id s2mps11_clk_id[] = { 260 { "s2mps11-clk", S2MPS11X}, 261 { "s5m8767-clk", S5M8767X}, 262 { }, 263 }; 264 MODULE_DEVICE_TABLE(platform, s2mps11_clk_id); 265 266 static struct platform_driver s2mps11_clk_driver = { 267 .driver = { 268 .name = "s2mps11-clk", 269 .owner = THIS_MODULE, 270 }, 271 .probe = s2mps11_clk_probe, 272 .remove = s2mps11_clk_remove, 273 .id_table = s2mps11_clk_id, 274 }; 275 276 static int __init s2mps11_clk_init(void) 277 { 278 return platform_driver_register(&s2mps11_clk_driver); 279 } 280 subsys_initcall(s2mps11_clk_init); 281 282 static void __init s2mps11_clk_cleanup(void) 283 { 284 platform_driver_unregister(&s2mps11_clk_driver); 285 } 286 module_exit(s2mps11_clk_cleanup); 287 288 MODULE_DESCRIPTION("S2MPS11 Clock Driver"); 289 MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>"); 290 MODULE_LICENSE("GPL"); 291