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 regmap_irq_chip_data *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); 177 178 /* ARM needs us to explicitly flag the IRQ as valid 179 * and will set them noprobe when we do so. */ 180 #ifdef CONFIG_ARM 181 set_irq_flags(virq, IRQF_VALID); 182 #else 183 irq_set_noprobe(virq); 184 #endif 185 186 return 0; 187 } 188 189 static const struct irq_domain_ops arizona_domain_ops = { 190 .map = arizona_irq_map, 191 .xlate = irq_domain_xlate_twocell, 192 }; 193 194 int arizona_irq_init(struct arizona *arizona) 195 { 196 int flags = IRQF_ONESHOT; 197 int ret, i; 198 const struct regmap_irq_chip *aod, *irq; 199 struct irq_data *irq_data; 200 201 arizona->ctrlif_error = true; 202 203 switch (arizona->type) { 204 #ifdef CONFIG_MFD_WM5102 205 case WM5102: 206 aod = &wm5102_aod; 207 irq = &wm5102_irq; 208 209 arizona->ctrlif_error = false; 210 break; 211 #endif 212 #ifdef CONFIG_MFD_WM5110 213 case WM5110: 214 case WM8280: 215 aod = &wm5110_aod; 216 217 switch (arizona->rev) { 218 case 0 ... 2: 219 irq = &wm5110_irq; 220 break; 221 default: 222 irq = &wm5110_revd_irq; 223 break; 224 } 225 226 arizona->ctrlif_error = false; 227 break; 228 #endif 229 #ifdef CONFIG_MFD_WM8997 230 case WM8997: 231 aod = &wm8997_aod; 232 irq = &wm8997_irq; 233 234 arizona->ctrlif_error = false; 235 break; 236 #endif 237 default: 238 BUG_ON("Unknown Arizona class device" == NULL); 239 return -EINVAL; 240 } 241 242 /* Disable all wake sources by default */ 243 regmap_write(arizona->regmap, ARIZONA_WAKE_CONTROL, 0); 244 245 /* Read the flags from the interrupt controller if not specified */ 246 if (!arizona->pdata.irq_flags) { 247 irq_data = irq_get_irq_data(arizona->irq); 248 if (!irq_data) { 249 dev_err(arizona->dev, "Invalid IRQ: %d\n", 250 arizona->irq); 251 return -EINVAL; 252 } 253 254 arizona->pdata.irq_flags = irqd_get_trigger_type(irq_data); 255 switch (arizona->pdata.irq_flags) { 256 case IRQF_TRIGGER_LOW: 257 case IRQF_TRIGGER_HIGH: 258 case IRQF_TRIGGER_RISING: 259 case IRQF_TRIGGER_FALLING: 260 break; 261 262 case IRQ_TYPE_NONE: 263 default: 264 /* Device default */ 265 arizona->pdata.irq_flags = IRQF_TRIGGER_LOW; 266 break; 267 } 268 } 269 270 if (arizona->pdata.irq_flags & (IRQF_TRIGGER_HIGH | 271 IRQF_TRIGGER_RISING)) { 272 ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1, 273 ARIZONA_IRQ_POL, 0); 274 if (ret != 0) { 275 dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n", 276 ret); 277 goto err; 278 } 279 } 280 281 flags |= arizona->pdata.irq_flags; 282 283 /* Allocate a virtual IRQ domain to distribute to the regmap domains */ 284 arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops, 285 arizona); 286 if (!arizona->virq) { 287 dev_err(arizona->dev, "Failed to add core IRQ domain\n"); 288 ret = -EINVAL; 289 goto err; 290 } 291 292 ret = regmap_add_irq_chip(arizona->regmap, 293 irq_create_mapping(arizona->virq, 0), 294 IRQF_ONESHOT, 0, aod, 295 &arizona->aod_irq_chip); 296 if (ret != 0) { 297 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret); 298 goto err_domain; 299 } 300 301 ret = regmap_add_irq_chip(arizona->regmap, 302 irq_create_mapping(arizona->virq, 1), 303 IRQF_ONESHOT, 0, irq, 304 &arizona->irq_chip); 305 if (ret != 0) { 306 dev_err(arizona->dev, "Failed to add main IRQs: %d\n", ret); 307 goto err_aod; 308 } 309 310 /* Make sure the boot done IRQ is unmasked for resumes */ 311 i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE); 312 ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT, 313 "Boot done", arizona); 314 if (ret != 0) { 315 dev_err(arizona->dev, "Failed to request boot done %d: %d\n", 316 arizona->irq, ret); 317 goto err_boot_done; 318 } 319 320 /* Handle control interface errors in the core */ 321 if (arizona->ctrlif_error) { 322 i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR); 323 ret = request_threaded_irq(i, NULL, arizona_ctrlif_err, 324 IRQF_ONESHOT, 325 "Control interface error", arizona); 326 if (ret != 0) { 327 dev_err(arizona->dev, 328 "Failed to request CTRLIF_ERR %d: %d\n", 329 arizona->irq, ret); 330 goto err_ctrlif; 331 } 332 } 333 334 /* Used to emulate edge trigger and to work around broken pinmux */ 335 if (arizona->pdata.irq_gpio) { 336 if (gpio_to_irq(arizona->pdata.irq_gpio) != arizona->irq) { 337 dev_warn(arizona->dev, "IRQ %d is not GPIO %d (%d)\n", 338 arizona->irq, arizona->pdata.irq_gpio, 339 gpio_to_irq(arizona->pdata.irq_gpio)); 340 arizona->irq = gpio_to_irq(arizona->pdata.irq_gpio); 341 } 342 343 ret = devm_gpio_request_one(arizona->dev, 344 arizona->pdata.irq_gpio, 345 GPIOF_IN, "arizona IRQ"); 346 if (ret != 0) { 347 dev_err(arizona->dev, 348 "Failed to request IRQ GPIO %d:: %d\n", 349 arizona->pdata.irq_gpio, ret); 350 arizona->pdata.irq_gpio = 0; 351 } 352 } 353 354 ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread, 355 flags, "arizona", arizona); 356 357 if (ret != 0) { 358 dev_err(arizona->dev, "Failed to request primary IRQ %d: %d\n", 359 arizona->irq, ret); 360 goto err_main_irq; 361 } 362 363 return 0; 364 365 err_main_irq: 366 if (arizona->ctrlif_error) 367 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), 368 arizona); 369 err_ctrlif: 370 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona); 371 err_boot_done: 372 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1), 373 arizona->irq_chip); 374 err_aod: 375 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0), 376 arizona->aod_irq_chip); 377 err_domain: 378 err: 379 return ret; 380 } 381 382 int arizona_irq_exit(struct arizona *arizona) 383 { 384 if (arizona->ctrlif_error) 385 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), 386 arizona); 387 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona); 388 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1), 389 arizona->irq_chip); 390 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0), 391 arizona->aod_irq_chip); 392 free_irq(arizona->irq, arizona); 393 394 return 0; 395 } 396