1 /* 2 * Copyright (c) 2014 MediaTek Inc. 3 * Author: Flora Fu, MediaTek 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 */ 14 15 #include <linux/interrupt.h> 16 #include <linux/module.h> 17 #include <linux/of_device.h> 18 #include <linux/of_irq.h> 19 #include <linux/regmap.h> 20 #include <linux/mfd/core.h> 21 #include <linux/mfd/mt6397/core.h> 22 #include <linux/mfd/mt6323/core.h> 23 #include <linux/mfd/mt6397/registers.h> 24 #include <linux/mfd/mt6323/registers.h> 25 26 #define MT6397_RTC_BASE 0xe000 27 #define MT6397_RTC_SIZE 0x3e 28 29 #define MT6323_CID_CODE 0x23 30 #define MT6391_CID_CODE 0x91 31 #define MT6397_CID_CODE 0x97 32 33 static const struct resource mt6397_rtc_resources[] = { 34 { 35 .start = MT6397_RTC_BASE, 36 .end = MT6397_RTC_BASE + MT6397_RTC_SIZE, 37 .flags = IORESOURCE_MEM, 38 }, 39 { 40 .start = MT6397_IRQ_RTC, 41 .end = MT6397_IRQ_RTC, 42 .flags = IORESOURCE_IRQ, 43 }, 44 }; 45 46 static const struct resource mt6323_keys_resources[] = { 47 DEFINE_RES_IRQ(MT6323_IRQ_STATUS_PWRKEY), 48 DEFINE_RES_IRQ(MT6323_IRQ_STATUS_FCHRKEY), 49 }; 50 51 static const struct resource mt6397_keys_resources[] = { 52 DEFINE_RES_IRQ(MT6397_IRQ_PWRKEY), 53 DEFINE_RES_IRQ(MT6397_IRQ_HOMEKEY), 54 }; 55 56 static const struct mfd_cell mt6323_devs[] = { 57 { 58 .name = "mt6323-regulator", 59 .of_compatible = "mediatek,mt6323-regulator" 60 }, { 61 .name = "mt6323-led", 62 .of_compatible = "mediatek,mt6323-led" 63 }, { 64 .name = "mtk-pmic-keys", 65 .num_resources = ARRAY_SIZE(mt6323_keys_resources), 66 .resources = mt6323_keys_resources, 67 .of_compatible = "mediatek,mt6323-keys" 68 }, 69 }; 70 71 static const struct mfd_cell mt6397_devs[] = { 72 { 73 .name = "mt6397-rtc", 74 .num_resources = ARRAY_SIZE(mt6397_rtc_resources), 75 .resources = mt6397_rtc_resources, 76 .of_compatible = "mediatek,mt6397-rtc", 77 }, { 78 .name = "mt6397-regulator", 79 .of_compatible = "mediatek,mt6397-regulator", 80 }, { 81 .name = "mt6397-codec", 82 .of_compatible = "mediatek,mt6397-codec", 83 }, { 84 .name = "mt6397-clk", 85 .of_compatible = "mediatek,mt6397-clk", 86 }, { 87 .name = "mt6397-pinctrl", 88 .of_compatible = "mediatek,mt6397-pinctrl", 89 }, { 90 .name = "mtk-pmic-keys", 91 .num_resources = ARRAY_SIZE(mt6397_keys_resources), 92 .resources = mt6397_keys_resources, 93 .of_compatible = "mediatek,mt6397-keys" 94 } 95 }; 96 97 static void mt6397_irq_lock(struct irq_data *data) 98 { 99 struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data); 100 101 mutex_lock(&mt6397->irqlock); 102 } 103 104 static void mt6397_irq_sync_unlock(struct irq_data *data) 105 { 106 struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data); 107 108 regmap_write(mt6397->regmap, mt6397->int_con[0], 109 mt6397->irq_masks_cur[0]); 110 regmap_write(mt6397->regmap, mt6397->int_con[1], 111 mt6397->irq_masks_cur[1]); 112 113 mutex_unlock(&mt6397->irqlock); 114 } 115 116 static void mt6397_irq_disable(struct irq_data *data) 117 { 118 struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data); 119 int shift = data->hwirq & 0xf; 120 int reg = data->hwirq >> 4; 121 122 mt6397->irq_masks_cur[reg] &= ~BIT(shift); 123 } 124 125 static void mt6397_irq_enable(struct irq_data *data) 126 { 127 struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(data); 128 int shift = data->hwirq & 0xf; 129 int reg = data->hwirq >> 4; 130 131 mt6397->irq_masks_cur[reg] |= BIT(shift); 132 } 133 134 #ifdef CONFIG_PM_SLEEP 135 static int mt6397_irq_set_wake(struct irq_data *irq_data, unsigned int on) 136 { 137 struct mt6397_chip *mt6397 = irq_data_get_irq_chip_data(irq_data); 138 int shift = irq_data->hwirq & 0xf; 139 int reg = irq_data->hwirq >> 4; 140 141 if (on) 142 mt6397->wake_mask[reg] |= BIT(shift); 143 else 144 mt6397->wake_mask[reg] &= ~BIT(shift); 145 146 return 0; 147 } 148 #else 149 #define mt6397_irq_set_wake NULL 150 #endif 151 152 static struct irq_chip mt6397_irq_chip = { 153 .name = "mt6397-irq", 154 .irq_bus_lock = mt6397_irq_lock, 155 .irq_bus_sync_unlock = mt6397_irq_sync_unlock, 156 .irq_enable = mt6397_irq_enable, 157 .irq_disable = mt6397_irq_disable, 158 .irq_set_wake = mt6397_irq_set_wake, 159 }; 160 161 static void mt6397_irq_handle_reg(struct mt6397_chip *mt6397, int reg, 162 int irqbase) 163 { 164 unsigned int status; 165 int i, irq, ret; 166 167 ret = regmap_read(mt6397->regmap, reg, &status); 168 if (ret) { 169 dev_err(mt6397->dev, "Failed to read irq status: %d\n", ret); 170 return; 171 } 172 173 for (i = 0; i < 16; i++) { 174 if (status & BIT(i)) { 175 irq = irq_find_mapping(mt6397->irq_domain, irqbase + i); 176 if (irq) 177 handle_nested_irq(irq); 178 } 179 } 180 181 regmap_write(mt6397->regmap, reg, status); 182 } 183 184 static irqreturn_t mt6397_irq_thread(int irq, void *data) 185 { 186 struct mt6397_chip *mt6397 = data; 187 188 mt6397_irq_handle_reg(mt6397, mt6397->int_status[0], 0); 189 mt6397_irq_handle_reg(mt6397, mt6397->int_status[1], 16); 190 191 return IRQ_HANDLED; 192 } 193 194 static int mt6397_irq_domain_map(struct irq_domain *d, unsigned int irq, 195 irq_hw_number_t hw) 196 { 197 struct mt6397_chip *mt6397 = d->host_data; 198 199 irq_set_chip_data(irq, mt6397); 200 irq_set_chip_and_handler(irq, &mt6397_irq_chip, handle_level_irq); 201 irq_set_nested_thread(irq, 1); 202 irq_set_noprobe(irq); 203 204 return 0; 205 } 206 207 static const struct irq_domain_ops mt6397_irq_domain_ops = { 208 .map = mt6397_irq_domain_map, 209 }; 210 211 static int mt6397_irq_init(struct mt6397_chip *mt6397) 212 { 213 int ret; 214 215 mutex_init(&mt6397->irqlock); 216 217 /* Mask all interrupt sources */ 218 regmap_write(mt6397->regmap, mt6397->int_con[0], 0x0); 219 regmap_write(mt6397->regmap, mt6397->int_con[1], 0x0); 220 221 mt6397->irq_domain = irq_domain_add_linear(mt6397->dev->of_node, 222 MT6397_IRQ_NR, &mt6397_irq_domain_ops, mt6397); 223 if (!mt6397->irq_domain) { 224 dev_err(mt6397->dev, "could not create irq domain\n"); 225 return -ENOMEM; 226 } 227 228 ret = devm_request_threaded_irq(mt6397->dev, mt6397->irq, NULL, 229 mt6397_irq_thread, IRQF_ONESHOT, "mt6397-pmic", mt6397); 230 if (ret) { 231 dev_err(mt6397->dev, "failed to register irq=%d; err: %d\n", 232 mt6397->irq, ret); 233 return ret; 234 } 235 236 return 0; 237 } 238 239 #ifdef CONFIG_PM_SLEEP 240 static int mt6397_irq_suspend(struct device *dev) 241 { 242 struct mt6397_chip *chip = dev_get_drvdata(dev); 243 244 regmap_write(chip->regmap, chip->int_con[0], chip->wake_mask[0]); 245 regmap_write(chip->regmap, chip->int_con[1], chip->wake_mask[1]); 246 247 enable_irq_wake(chip->irq); 248 249 return 0; 250 } 251 252 static int mt6397_irq_resume(struct device *dev) 253 { 254 struct mt6397_chip *chip = dev_get_drvdata(dev); 255 256 regmap_write(chip->regmap, chip->int_con[0], chip->irq_masks_cur[0]); 257 regmap_write(chip->regmap, chip->int_con[1], chip->irq_masks_cur[1]); 258 259 disable_irq_wake(chip->irq); 260 261 return 0; 262 } 263 #endif 264 265 static SIMPLE_DEV_PM_OPS(mt6397_pm_ops, mt6397_irq_suspend, 266 mt6397_irq_resume); 267 268 static int mt6397_probe(struct platform_device *pdev) 269 { 270 int ret; 271 unsigned int id; 272 struct mt6397_chip *pmic; 273 274 pmic = devm_kzalloc(&pdev->dev, sizeof(*pmic), GFP_KERNEL); 275 if (!pmic) 276 return -ENOMEM; 277 278 pmic->dev = &pdev->dev; 279 280 /* 281 * mt6397 MFD is child device of soc pmic wrapper. 282 * Regmap is set from its parent. 283 */ 284 pmic->regmap = dev_get_regmap(pdev->dev.parent, NULL); 285 if (!pmic->regmap) 286 return -ENODEV; 287 288 platform_set_drvdata(pdev, pmic); 289 290 ret = regmap_read(pmic->regmap, MT6397_CID, &id); 291 if (ret) { 292 dev_err(pmic->dev, "Failed to read chip id: %d\n", ret); 293 return ret; 294 } 295 296 pmic->irq = platform_get_irq(pdev, 0); 297 if (pmic->irq <= 0) 298 return pmic->irq; 299 300 switch (id & 0xff) { 301 case MT6323_CID_CODE: 302 pmic->int_con[0] = MT6323_INT_CON0; 303 pmic->int_con[1] = MT6323_INT_CON1; 304 pmic->int_status[0] = MT6323_INT_STATUS0; 305 pmic->int_status[1] = MT6323_INT_STATUS1; 306 ret = mt6397_irq_init(pmic); 307 if (ret) 308 return ret; 309 310 ret = devm_mfd_add_devices(&pdev->dev, -1, mt6323_devs, 311 ARRAY_SIZE(mt6323_devs), NULL, 312 0, pmic->irq_domain); 313 break; 314 315 case MT6397_CID_CODE: 316 case MT6391_CID_CODE: 317 pmic->int_con[0] = MT6397_INT_CON0; 318 pmic->int_con[1] = MT6397_INT_CON1; 319 pmic->int_status[0] = MT6397_INT_STATUS0; 320 pmic->int_status[1] = MT6397_INT_STATUS1; 321 ret = mt6397_irq_init(pmic); 322 if (ret) 323 return ret; 324 325 ret = devm_mfd_add_devices(&pdev->dev, -1, mt6397_devs, 326 ARRAY_SIZE(mt6397_devs), NULL, 327 0, pmic->irq_domain); 328 break; 329 330 default: 331 dev_err(&pdev->dev, "unsupported chip: %d\n", id); 332 ret = -ENODEV; 333 break; 334 } 335 336 if (ret) { 337 irq_domain_remove(pmic->irq_domain); 338 dev_err(&pdev->dev, "failed to add child devices: %d\n", ret); 339 } 340 341 return ret; 342 } 343 344 static const struct of_device_id mt6397_of_match[] = { 345 { .compatible = "mediatek,mt6397" }, 346 { .compatible = "mediatek,mt6323" }, 347 { } 348 }; 349 MODULE_DEVICE_TABLE(of, mt6397_of_match); 350 351 static const struct platform_device_id mt6397_id[] = { 352 { "mt6397", 0 }, 353 { }, 354 }; 355 MODULE_DEVICE_TABLE(platform, mt6397_id); 356 357 static struct platform_driver mt6397_driver = { 358 .probe = mt6397_probe, 359 .driver = { 360 .name = "mt6397", 361 .of_match_table = of_match_ptr(mt6397_of_match), 362 .pm = &mt6397_pm_ops, 363 }, 364 .id_table = mt6397_id, 365 }; 366 367 module_platform_driver(mt6397_driver); 368 369 MODULE_AUTHOR("Flora Fu, MediaTek"); 370 MODULE_DESCRIPTION("Driver for MediaTek MT6397 PMIC"); 371 MODULE_LICENSE("GPL"); 372