1 /* 2 * Arizona interrupt support 3 * 4 * Copyright 2012 Wolfson Microelectronics plc 5 * 6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #include <linux/delay.h> 14 #include <linux/gpio.h> 15 #include <linux/interrupt.h> 16 #include <linux/irq.h> 17 #include <linux/irqdomain.h> 18 #include <linux/module.h> 19 #include <linux/pm_runtime.h> 20 #include <linux/regmap.h> 21 #include <linux/regulator/consumer.h> 22 #include <linux/slab.h> 23 24 #include <linux/mfd/arizona/core.h> 25 #include <linux/mfd/arizona/registers.h> 26 27 #include "arizona.h" 28 29 static int arizona_map_irq(struct arizona *arizona, int irq) 30 { 31 int ret; 32 33 if (arizona->aod_irq_chip) { 34 ret = regmap_irq_get_virq(arizona->aod_irq_chip, irq); 35 if (ret >= 0) 36 return ret; 37 } 38 39 return regmap_irq_get_virq(arizona->irq_chip, irq); 40 } 41 42 int arizona_request_irq(struct arizona *arizona, int irq, char *name, 43 irq_handler_t handler, void *data) 44 { 45 irq = arizona_map_irq(arizona, irq); 46 if (irq < 0) 47 return irq; 48 49 return request_threaded_irq(irq, NULL, handler, IRQF_ONESHOT, 50 name, data); 51 } 52 EXPORT_SYMBOL_GPL(arizona_request_irq); 53 54 void arizona_free_irq(struct arizona *arizona, int irq, void *data) 55 { 56 irq = arizona_map_irq(arizona, irq); 57 if (irq < 0) 58 return; 59 60 free_irq(irq, data); 61 } 62 EXPORT_SYMBOL_GPL(arizona_free_irq); 63 64 int arizona_set_irq_wake(struct arizona *arizona, int irq, int on) 65 { 66 irq = arizona_map_irq(arizona, irq); 67 if (irq < 0) 68 return irq; 69 70 return irq_set_irq_wake(irq, on); 71 } 72 EXPORT_SYMBOL_GPL(arizona_set_irq_wake); 73 74 static irqreturn_t arizona_boot_done(int irq, void *data) 75 { 76 struct arizona *arizona = data; 77 78 dev_dbg(arizona->dev, "Boot done\n"); 79 80 return IRQ_HANDLED; 81 } 82 83 static irqreturn_t arizona_ctrlif_err(int irq, void *data) 84 { 85 struct arizona *arizona = data; 86 87 /* 88 * For pretty much all potential sources a register cache sync 89 * won't help, we've just got a software bug somewhere. 90 */ 91 dev_err(arizona->dev, "Control interface error\n"); 92 93 return IRQ_HANDLED; 94 } 95 96 static irqreturn_t arizona_irq_thread(int irq, void *data) 97 { 98 struct arizona *arizona = data; 99 bool poll; 100 unsigned int val; 101 int ret; 102 103 ret = pm_runtime_get_sync(arizona->dev); 104 if (ret < 0) { 105 dev_err(arizona->dev, "Failed to resume device: %d\n", ret); 106 return IRQ_NONE; 107 } 108 109 do { 110 poll = false; 111 112 if (arizona->aod_irq_chip) 113 handle_nested_irq(irq_find_mapping(arizona->virq, 0)); 114 115 /* 116 * Check if one of the main interrupts is asserted and only 117 * check that domain if it is. 118 */ 119 ret = regmap_read(arizona->regmap, ARIZONA_IRQ_PIN_STATUS, 120 &val); 121 if (ret == 0 && val & ARIZONA_IRQ1_STS) { 122 handle_nested_irq(irq_find_mapping(arizona->virq, 1)); 123 } else if (ret != 0) { 124 dev_err(arizona->dev, 125 "Failed to read main IRQ status: %d\n", ret); 126 } 127 128 /* 129 * Poll the IRQ pin status to see if we're really done 130 * if the interrupt controller can't do it for us. 131 */ 132 if (!arizona->pdata.irq_gpio) { 133 break; 134 } else if (arizona->pdata.irq_flags & IRQF_TRIGGER_RISING && 135 gpio_get_value_cansleep(arizona->pdata.irq_gpio)) { 136 poll = true; 137 } else if (arizona->pdata.irq_flags & IRQF_TRIGGER_FALLING && 138 !gpio_get_value_cansleep(arizona->pdata.irq_gpio)) { 139 poll = true; 140 } 141 } while (poll); 142 143 pm_runtime_mark_last_busy(arizona->dev); 144 pm_runtime_put_autosuspend(arizona->dev); 145 146 return IRQ_HANDLED; 147 } 148 149 static void arizona_irq_enable(struct irq_data *data) 150 { 151 } 152 153 static void arizona_irq_disable(struct irq_data *data) 154 { 155 } 156 157 static int arizona_irq_set_wake(struct irq_data *data, unsigned int on) 158 { 159 struct arizona *arizona = irq_data_get_irq_chip_data(data); 160 161 return irq_set_irq_wake(arizona->irq, on); 162 } 163 164 static struct irq_chip arizona_irq_chip = { 165 .name = "arizona", 166 .irq_disable = arizona_irq_disable, 167 .irq_enable = arizona_irq_enable, 168 .irq_set_wake = arizona_irq_set_wake, 169 }; 170 171 static int arizona_irq_map(struct irq_domain *h, unsigned int virq, 172 irq_hw_number_t hw) 173 { 174 struct arizona *data = h->host_data; 175 176 irq_set_chip_data(virq, data); 177 irq_set_chip_and_handler(virq, &arizona_irq_chip, handle_simple_irq); 178 irq_set_nested_thread(virq, 1); 179 irq_set_noprobe(virq); 180 181 return 0; 182 } 183 184 static const struct irq_domain_ops arizona_domain_ops = { 185 .map = arizona_irq_map, 186 .xlate = irq_domain_xlate_twocell, 187 }; 188 189 int arizona_irq_init(struct arizona *arizona) 190 { 191 int flags = IRQF_ONESHOT; 192 int ret, i; 193 const struct regmap_irq_chip *aod, *irq; 194 struct irq_data *irq_data; 195 196 arizona->ctrlif_error = true; 197 198 switch (arizona->type) { 199 #ifdef CONFIG_MFD_WM5102 200 case WM5102: 201 aod = &wm5102_aod; 202 irq = &wm5102_irq; 203 204 arizona->ctrlif_error = false; 205 break; 206 #endif 207 #ifdef CONFIG_MFD_WM5110 208 case WM5110: 209 case WM8280: 210 aod = &wm5110_aod; 211 212 switch (arizona->rev) { 213 case 0 ... 2: 214 irq = &wm5110_irq; 215 break; 216 default: 217 irq = &wm5110_revd_irq; 218 break; 219 } 220 221 arizona->ctrlif_error = false; 222 break; 223 #endif 224 #ifdef CONFIG_MFD_CS47L24 225 case WM1831: 226 case CS47L24: 227 aod = NULL; 228 irq = &cs47l24_irq; 229 230 arizona->ctrlif_error = false; 231 break; 232 #endif 233 #ifdef CONFIG_MFD_WM8997 234 case WM8997: 235 aod = &wm8997_aod; 236 irq = &wm8997_irq; 237 238 arizona->ctrlif_error = false; 239 break; 240 #endif 241 #ifdef CONFIG_MFD_WM8998 242 case WM8998: 243 case WM1814: 244 aod = &wm8998_aod; 245 irq = &wm8998_irq; 246 247 arizona->ctrlif_error = false; 248 break; 249 #endif 250 default: 251 BUG_ON("Unknown Arizona class device" == NULL); 252 return -EINVAL; 253 } 254 255 /* Disable all wake sources by default */ 256 regmap_write(arizona->regmap, ARIZONA_WAKE_CONTROL, 0); 257 258 /* Read the flags from the interrupt controller if not specified */ 259 if (!arizona->pdata.irq_flags) { 260 irq_data = irq_get_irq_data(arizona->irq); 261 if (!irq_data) { 262 dev_err(arizona->dev, "Invalid IRQ: %d\n", 263 arizona->irq); 264 return -EINVAL; 265 } 266 267 arizona->pdata.irq_flags = irqd_get_trigger_type(irq_data); 268 switch (arizona->pdata.irq_flags) { 269 case IRQF_TRIGGER_LOW: 270 case IRQF_TRIGGER_HIGH: 271 case IRQF_TRIGGER_RISING: 272 case IRQF_TRIGGER_FALLING: 273 break; 274 275 case IRQ_TYPE_NONE: 276 default: 277 /* Device default */ 278 arizona->pdata.irq_flags = IRQF_TRIGGER_LOW; 279 break; 280 } 281 } 282 283 if (arizona->pdata.irq_flags & (IRQF_TRIGGER_HIGH | 284 IRQF_TRIGGER_RISING)) { 285 ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1, 286 ARIZONA_IRQ_POL, 0); 287 if (ret != 0) { 288 dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n", 289 ret); 290 goto err; 291 } 292 } 293 294 flags |= arizona->pdata.irq_flags; 295 296 /* Allocate a virtual IRQ domain to distribute to the regmap domains */ 297 arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops, 298 arizona); 299 if (!arizona->virq) { 300 dev_err(arizona->dev, "Failed to add core IRQ domain\n"); 301 ret = -EINVAL; 302 goto err; 303 } 304 305 if (aod) { 306 ret = regmap_add_irq_chip(arizona->regmap, 307 irq_create_mapping(arizona->virq, 0), 308 IRQF_ONESHOT, 0, aod, 309 &arizona->aod_irq_chip); 310 if (ret != 0) { 311 dev_err(arizona->dev, 312 "Failed to add AOD IRQs: %d\n", ret); 313 goto err; 314 } 315 } 316 317 ret = regmap_add_irq_chip(arizona->regmap, 318 irq_create_mapping(arizona->virq, 1), 319 IRQF_ONESHOT, 0, irq, 320 &arizona->irq_chip); 321 if (ret != 0) { 322 dev_err(arizona->dev, "Failed to add main IRQs: %d\n", ret); 323 goto err_aod; 324 } 325 326 /* Used to emulate edge trigger and to work around broken pinmux */ 327 if (arizona->pdata.irq_gpio) { 328 if (gpio_to_irq(arizona->pdata.irq_gpio) != arizona->irq) { 329 dev_warn(arizona->dev, "IRQ %d is not GPIO %d (%d)\n", 330 arizona->irq, arizona->pdata.irq_gpio, 331 gpio_to_irq(arizona->pdata.irq_gpio)); 332 arizona->irq = gpio_to_irq(arizona->pdata.irq_gpio); 333 } 334 335 ret = devm_gpio_request_one(arizona->dev, 336 arizona->pdata.irq_gpio, 337 GPIOF_IN, "arizona IRQ"); 338 if (ret != 0) { 339 dev_err(arizona->dev, 340 "Failed to request IRQ GPIO %d:: %d\n", 341 arizona->pdata.irq_gpio, ret); 342 arizona->pdata.irq_gpio = 0; 343 } 344 } 345 346 ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread, 347 flags, "arizona", arizona); 348 349 if (ret != 0) { 350 dev_err(arizona->dev, "Failed to request primary IRQ %d: %d\n", 351 arizona->irq, ret); 352 goto err_main_irq; 353 } 354 355 /* Make sure the boot done IRQ is unmasked for resumes */ 356 i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE); 357 ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT, 358 "Boot done", arizona); 359 if (ret != 0) { 360 dev_err(arizona->dev, "Failed to request boot done %d: %d\n", 361 arizona->irq, ret); 362 goto err_boot_done; 363 } 364 365 /* Handle control interface errors in the core */ 366 if (arizona->ctrlif_error) { 367 i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR); 368 ret = request_threaded_irq(i, NULL, arizona_ctrlif_err, 369 IRQF_ONESHOT, 370 "Control interface error", arizona); 371 if (ret != 0) { 372 dev_err(arizona->dev, 373 "Failed to request CTRLIF_ERR %d: %d\n", 374 arizona->irq, ret); 375 goto err_ctrlif; 376 } 377 } 378 379 return 0; 380 381 err_ctrlif: 382 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona); 383 err_boot_done: 384 free_irq(arizona->irq, arizona); 385 err_main_irq: 386 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1), 387 arizona->irq_chip); 388 err_aod: 389 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0), 390 arizona->aod_irq_chip); 391 err: 392 return ret; 393 } 394 395 int arizona_irq_exit(struct arizona *arizona) 396 { 397 if (arizona->ctrlif_error) 398 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), 399 arizona); 400 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona); 401 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1), 402 arizona->irq_chip); 403 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0), 404 arizona->aod_irq_chip); 405 free_irq(arizona->irq, arizona); 406 407 return 0; 408 } 409