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 struct irq_chip arizona_irq_chip = { 156 .name = "arizona", 157 .irq_disable = arizona_irq_disable, 158 .irq_enable = arizona_irq_enable, 159 }; 160 161 static int arizona_irq_map(struct irq_domain *h, unsigned int virq, 162 irq_hw_number_t hw) 163 { 164 struct regmap_irq_chip_data *data = h->host_data; 165 166 irq_set_chip_data(virq, data); 167 irq_set_chip_and_handler(virq, &arizona_irq_chip, handle_edge_irq); 168 irq_set_nested_thread(virq, 1); 169 170 /* ARM needs us to explicitly flag the IRQ as valid 171 * and will set them noprobe when we do so. */ 172 #ifdef CONFIG_ARM 173 set_irq_flags(virq, IRQF_VALID); 174 #else 175 irq_set_noprobe(virq); 176 #endif 177 178 return 0; 179 } 180 181 static struct irq_domain_ops arizona_domain_ops = { 182 .map = arizona_irq_map, 183 .xlate = irq_domain_xlate_twocell, 184 }; 185 186 int arizona_irq_init(struct arizona *arizona) 187 { 188 int flags = IRQF_ONESHOT; 189 int ret, i; 190 const struct regmap_irq_chip *aod, *irq; 191 struct irq_data *irq_data; 192 193 arizona->ctrlif_error = true; 194 195 switch (arizona->type) { 196 #ifdef CONFIG_MFD_WM5102 197 case WM5102: 198 aod = &wm5102_aod; 199 irq = &wm5102_irq; 200 201 arizona->ctrlif_error = false; 202 break; 203 #endif 204 #ifdef CONFIG_MFD_WM5110 205 case WM5110: 206 aod = &wm5110_aod; 207 208 switch (arizona->rev) { 209 case 0 ... 2: 210 irq = &wm5110_irq; 211 break; 212 default: 213 irq = &wm5110_revd_irq; 214 break; 215 } 216 217 arizona->ctrlif_error = false; 218 break; 219 #endif 220 #ifdef CONFIG_MFD_WM8997 221 case WM8997: 222 aod = &wm8997_aod; 223 irq = &wm8997_irq; 224 225 arizona->ctrlif_error = false; 226 break; 227 #endif 228 default: 229 BUG_ON("Unknown Arizona class device" == NULL); 230 return -EINVAL; 231 } 232 233 /* Disable all wake sources by default */ 234 regmap_write(arizona->regmap, ARIZONA_WAKE_CONTROL, 0); 235 236 /* Read the flags from the interrupt controller if not specified */ 237 if (!arizona->pdata.irq_flags) { 238 irq_data = irq_get_irq_data(arizona->irq); 239 if (!irq_data) { 240 dev_err(arizona->dev, "Invalid IRQ: %d\n", 241 arizona->irq); 242 return -EINVAL; 243 } 244 245 arizona->pdata.irq_flags = irqd_get_trigger_type(irq_data); 246 switch (arizona->pdata.irq_flags) { 247 case IRQF_TRIGGER_LOW: 248 case IRQF_TRIGGER_HIGH: 249 case IRQF_TRIGGER_RISING: 250 case IRQF_TRIGGER_FALLING: 251 break; 252 253 case IRQ_TYPE_NONE: 254 default: 255 /* Device default */ 256 arizona->pdata.irq_flags = IRQF_TRIGGER_LOW; 257 break; 258 } 259 } 260 261 if (arizona->pdata.irq_flags & (IRQF_TRIGGER_HIGH | 262 IRQF_TRIGGER_RISING)) { 263 ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1, 264 ARIZONA_IRQ_POL, 0); 265 if (ret != 0) { 266 dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n", 267 ret); 268 goto err; 269 } 270 } 271 272 flags |= arizona->pdata.irq_flags; 273 274 /* Allocate a virtual IRQ domain to distribute to the regmap domains */ 275 arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops, 276 arizona); 277 if (!arizona->virq) { 278 dev_err(arizona->dev, "Failed to add core IRQ domain\n"); 279 ret = -EINVAL; 280 goto err; 281 } 282 283 ret = regmap_add_irq_chip(arizona->regmap, 284 irq_create_mapping(arizona->virq, 0), 285 IRQF_ONESHOT, -1, aod, 286 &arizona->aod_irq_chip); 287 if (ret != 0) { 288 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret); 289 goto err_domain; 290 } 291 292 ret = regmap_add_irq_chip(arizona->regmap, 293 irq_create_mapping(arizona->virq, 1), 294 IRQF_ONESHOT, -1, irq, 295 &arizona->irq_chip); 296 if (ret != 0) { 297 dev_err(arizona->dev, "Failed to add main IRQs: %d\n", ret); 298 goto err_aod; 299 } 300 301 /* Make sure the boot done IRQ is unmasked for resumes */ 302 i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE); 303 ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT, 304 "Boot done", arizona); 305 if (ret != 0) { 306 dev_err(arizona->dev, "Failed to request boot done %d: %d\n", 307 arizona->irq, ret); 308 goto err_boot_done; 309 } 310 311 /* Handle control interface errors in the core */ 312 if (arizona->ctrlif_error) { 313 i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR); 314 ret = request_threaded_irq(i, NULL, arizona_ctrlif_err, 315 IRQF_ONESHOT, 316 "Control interface error", arizona); 317 if (ret != 0) { 318 dev_err(arizona->dev, 319 "Failed to request CTRLIF_ERR %d: %d\n", 320 arizona->irq, ret); 321 goto err_ctrlif; 322 } 323 } 324 325 /* Used to emulate edge trigger and to work around broken pinmux */ 326 if (arizona->pdata.irq_gpio) { 327 if (gpio_to_irq(arizona->pdata.irq_gpio) != arizona->irq) { 328 dev_warn(arizona->dev, "IRQ %d is not GPIO %d (%d)\n", 329 arizona->irq, arizona->pdata.irq_gpio, 330 gpio_to_irq(arizona->pdata.irq_gpio)); 331 arizona->irq = gpio_to_irq(arizona->pdata.irq_gpio); 332 } 333 334 ret = devm_gpio_request_one(arizona->dev, 335 arizona->pdata.irq_gpio, 336 GPIOF_IN, "arizona IRQ"); 337 if (ret != 0) { 338 dev_err(arizona->dev, 339 "Failed to request IRQ GPIO %d:: %d\n", 340 arizona->pdata.irq_gpio, ret); 341 arizona->pdata.irq_gpio = 0; 342 } 343 } 344 345 ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread, 346 flags, "arizona", arizona); 347 348 if (ret != 0) { 349 dev_err(arizona->dev, "Failed to request primary IRQ %d: %d\n", 350 arizona->irq, ret); 351 goto err_main_irq; 352 } 353 354 return 0; 355 356 err_main_irq: 357 if (arizona->ctrlif_error) 358 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), 359 arizona); 360 err_ctrlif: 361 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona); 362 err_boot_done: 363 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1), 364 arizona->irq_chip); 365 err_aod: 366 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0), 367 arizona->aod_irq_chip); 368 err_domain: 369 err: 370 return ret; 371 } 372 373 int arizona_irq_exit(struct arizona *arizona) 374 { 375 if (arizona->ctrlif_error) 376 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), 377 arizona); 378 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona); 379 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1), 380 arizona->irq_chip); 381 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0), 382 arizona->aod_irq_chip); 383 free_irq(arizona->irq, arizona); 384 385 return 0; 386 } 387