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 enum { 32 S2MPS11_CLK_AP = 0, 33 S2MPS11_CLK_CP, 34 S2MPS11_CLK_BT, 35 S2MPS11_CLKS_NUM, 36 }; 37 38 struct s2mps11_clk { 39 struct sec_pmic_dev *iodev; 40 struct device_node *clk_np; 41 struct clk_hw hw; 42 struct clk *clk; 43 struct clk_lookup *lookup; 44 u32 mask; 45 unsigned int reg; 46 }; 47 48 static struct s2mps11_clk *to_s2mps11_clk(struct clk_hw *hw) 49 { 50 return container_of(hw, struct s2mps11_clk, hw); 51 } 52 53 static int s2mps11_clk_prepare(struct clk_hw *hw) 54 { 55 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); 56 57 return regmap_update_bits(s2mps11->iodev->regmap_pmic, 58 s2mps11->reg, 59 s2mps11->mask, s2mps11->mask); 60 } 61 62 static void s2mps11_clk_unprepare(struct clk_hw *hw) 63 { 64 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); 65 66 regmap_update_bits(s2mps11->iodev->regmap_pmic, s2mps11->reg, 67 s2mps11->mask, ~s2mps11->mask); 68 } 69 70 static int s2mps11_clk_is_prepared(struct clk_hw *hw) 71 { 72 int ret; 73 u32 val; 74 struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw); 75 76 ret = regmap_read(s2mps11->iodev->regmap_pmic, 77 s2mps11->reg, &val); 78 if (ret < 0) 79 return -EINVAL; 80 81 return val & s2mps11->mask; 82 } 83 84 static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw, 85 unsigned long parent_rate) 86 { 87 return 32768; 88 } 89 90 static struct clk_ops s2mps11_clk_ops = { 91 .prepare = s2mps11_clk_prepare, 92 .unprepare = s2mps11_clk_unprepare, 93 .is_prepared = s2mps11_clk_is_prepared, 94 .recalc_rate = s2mps11_clk_recalc_rate, 95 }; 96 97 /* This s2mps11_clks_init tructure is common to s2mps11, s2mps13 and s2mps14 */ 98 static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = { 99 [S2MPS11_CLK_AP] = { 100 .name = "s2mps11_ap", 101 .ops = &s2mps11_clk_ops, 102 }, 103 [S2MPS11_CLK_CP] = { 104 .name = "s2mps11_cp", 105 .ops = &s2mps11_clk_ops, 106 }, 107 [S2MPS11_CLK_BT] = { 108 .name = "s2mps11_bt", 109 .ops = &s2mps11_clk_ops, 110 }, 111 }; 112 113 static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev, 114 struct clk_init_data *clks_init) 115 { 116 struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent); 117 struct device_node *clk_np; 118 int i; 119 120 if (!iodev->dev->of_node) 121 return ERR_PTR(-EINVAL); 122 123 clk_np = of_get_child_by_name(iodev->dev->of_node, "clocks"); 124 if (!clk_np) { 125 dev_err(&pdev->dev, "could not find clock sub-node\n"); 126 return ERR_PTR(-EINVAL); 127 } 128 129 for (i = 0; i < S2MPS11_CLKS_NUM; i++) 130 of_property_read_string_index(clk_np, "clock-output-names", i, 131 &clks_init[i].name); 132 133 return clk_np; 134 } 135 136 static int s2mps11_clk_probe(struct platform_device *pdev) 137 { 138 struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent); 139 struct s2mps11_clk *s2mps11_clks; 140 struct clk_hw_onecell_data *clk_data; 141 unsigned int s2mps11_reg; 142 int i, ret = 0; 143 enum sec_device_type hwid = platform_get_device_id(pdev)->driver_data; 144 145 s2mps11_clks = devm_kcalloc(&pdev->dev, S2MPS11_CLKS_NUM, 146 sizeof(*s2mps11_clks), GFP_KERNEL); 147 if (!s2mps11_clks) 148 return -ENOMEM; 149 150 clk_data = devm_kzalloc(&pdev->dev, 151 struct_size(clk_data, hws, S2MPS11_CLKS_NUM), 152 GFP_KERNEL); 153 if (!clk_data) 154 return -ENOMEM; 155 156 switch (hwid) { 157 case S2MPS11X: 158 s2mps11_reg = S2MPS11_REG_RTC_CTRL; 159 break; 160 case S2MPS13X: 161 s2mps11_reg = S2MPS13_REG_RTCCTRL; 162 break; 163 case S2MPS14X: 164 s2mps11_reg = S2MPS14_REG_RTCCTRL; 165 break; 166 case S5M8767X: 167 s2mps11_reg = S5M8767_REG_CTRL1; 168 break; 169 default: 170 dev_err(&pdev->dev, "Invalid device type\n"); 171 return -EINVAL; 172 } 173 174 /* Store clocks of_node in first element of s2mps11_clks array */ 175 s2mps11_clks->clk_np = s2mps11_clk_parse_dt(pdev, s2mps11_clks_init); 176 if (IS_ERR(s2mps11_clks->clk_np)) 177 return PTR_ERR(s2mps11_clks->clk_np); 178 179 for (i = 0; i < S2MPS11_CLKS_NUM; i++) { 180 if (i == S2MPS11_CLK_CP && hwid == S2MPS14X) 181 continue; /* Skip clocks not present in some devices */ 182 s2mps11_clks[i].iodev = iodev; 183 s2mps11_clks[i].hw.init = &s2mps11_clks_init[i]; 184 s2mps11_clks[i].mask = 1 << i; 185 s2mps11_clks[i].reg = s2mps11_reg; 186 187 s2mps11_clks[i].clk = devm_clk_register(&pdev->dev, 188 &s2mps11_clks[i].hw); 189 if (IS_ERR(s2mps11_clks[i].clk)) { 190 dev_err(&pdev->dev, "Fail to register : %s\n", 191 s2mps11_clks_init[i].name); 192 ret = PTR_ERR(s2mps11_clks[i].clk); 193 goto err_reg; 194 } 195 196 s2mps11_clks[i].lookup = clkdev_hw_create(&s2mps11_clks[i].hw, 197 s2mps11_clks_init[i].name, NULL); 198 if (!s2mps11_clks[i].lookup) { 199 ret = -ENOMEM; 200 goto err_reg; 201 } 202 clk_data->hws[i] = &s2mps11_clks[i].hw; 203 } 204 205 clk_data->num = S2MPS11_CLKS_NUM; 206 of_clk_add_hw_provider(s2mps11_clks->clk_np, of_clk_hw_onecell_get, 207 clk_data); 208 209 platform_set_drvdata(pdev, s2mps11_clks); 210 211 return ret; 212 213 err_reg: 214 while (--i >= 0) 215 clkdev_drop(s2mps11_clks[i].lookup); 216 217 return ret; 218 } 219 220 static int s2mps11_clk_remove(struct platform_device *pdev) 221 { 222 struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev); 223 int i; 224 225 of_clk_del_provider(s2mps11_clks[0].clk_np); 226 /* Drop the reference obtained in s2mps11_clk_parse_dt */ 227 of_node_put(s2mps11_clks[0].clk_np); 228 229 for (i = 0; i < S2MPS11_CLKS_NUM; i++) { 230 /* Skip clocks not present on S2MPS14 */ 231 if (!s2mps11_clks[i].lookup) 232 continue; 233 clkdev_drop(s2mps11_clks[i].lookup); 234 } 235 236 return 0; 237 } 238 239 static const struct platform_device_id s2mps11_clk_id[] = { 240 { "s2mps11-clk", S2MPS11X}, 241 { "s2mps13-clk", S2MPS13X}, 242 { "s2mps14-clk", S2MPS14X}, 243 { "s5m8767-clk", S5M8767X}, 244 { }, 245 }; 246 MODULE_DEVICE_TABLE(platform, s2mps11_clk_id); 247 248 static struct platform_driver s2mps11_clk_driver = { 249 .driver = { 250 .name = "s2mps11-clk", 251 }, 252 .probe = s2mps11_clk_probe, 253 .remove = s2mps11_clk_remove, 254 .id_table = s2mps11_clk_id, 255 }; 256 257 static int __init s2mps11_clk_init(void) 258 { 259 return platform_driver_register(&s2mps11_clk_driver); 260 } 261 subsys_initcall(s2mps11_clk_init); 262 263 static void __exit s2mps11_clk_cleanup(void) 264 { 265 platform_driver_unregister(&s2mps11_clk_driver); 266 } 267 module_exit(s2mps11_clk_cleanup); 268 269 MODULE_DESCRIPTION("S2MPS11 Clock Driver"); 270 MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>"); 271 MODULE_LICENSE("GPL"); 272