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