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 unsigned int val; 98 int ret; 99 100 ret = pm_runtime_get_sync(arizona->dev); 101 if (ret < 0) { 102 dev_err(arizona->dev, "Failed to resume device: %d\n", ret); 103 return IRQ_NONE; 104 } 105 106 /* Always handle the AoD domain */ 107 handle_nested_irq(irq_find_mapping(arizona->virq, 0)); 108 109 /* 110 * Check if one of the main interrupts is asserted and only 111 * check that domain if it is. 112 */ 113 ret = regmap_read(arizona->regmap, ARIZONA_IRQ_PIN_STATUS, &val); 114 if (ret == 0 && val & ARIZONA_IRQ1_STS) { 115 handle_nested_irq(irq_find_mapping(arizona->virq, 1)); 116 } else if (ret != 0) { 117 dev_err(arizona->dev, "Failed to read main IRQ status: %d\n", 118 ret); 119 } 120 121 pm_runtime_mark_last_busy(arizona->dev); 122 pm_runtime_put_autosuspend(arizona->dev); 123 124 return IRQ_HANDLED; 125 } 126 127 static void arizona_irq_enable(struct irq_data *data) 128 { 129 } 130 131 static void arizona_irq_disable(struct irq_data *data) 132 { 133 } 134 135 static struct irq_chip arizona_irq_chip = { 136 .name = "arizona", 137 .irq_disable = arizona_irq_disable, 138 .irq_enable = arizona_irq_enable, 139 }; 140 141 static int arizona_irq_map(struct irq_domain *h, unsigned int virq, 142 irq_hw_number_t hw) 143 { 144 struct regmap_irq_chip_data *data = h->host_data; 145 146 irq_set_chip_data(virq, data); 147 irq_set_chip_and_handler(virq, &arizona_irq_chip, handle_edge_irq); 148 irq_set_nested_thread(virq, 1); 149 150 /* ARM needs us to explicitly flag the IRQ as valid 151 * and will set them noprobe when we do so. */ 152 #ifdef CONFIG_ARM 153 set_irq_flags(virq, IRQF_VALID); 154 #else 155 irq_set_noprobe(virq); 156 #endif 157 158 return 0; 159 } 160 161 static struct irq_domain_ops arizona_domain_ops = { 162 .map = arizona_irq_map, 163 .xlate = irq_domain_xlate_twocell, 164 }; 165 166 int arizona_irq_init(struct arizona *arizona) 167 { 168 int flags = IRQF_ONESHOT; 169 int ret, i; 170 const struct regmap_irq_chip *aod, *irq; 171 bool ctrlif_error = true; 172 173 switch (arizona->type) { 174 #ifdef CONFIG_MFD_WM5102 175 case WM5102: 176 aod = &wm5102_aod; 177 irq = &wm5102_irq; 178 179 switch (arizona->rev) { 180 case 0: 181 case 1: 182 ctrlif_error = false; 183 break; 184 default: 185 break; 186 } 187 break; 188 #endif 189 #ifdef CONFIG_MFD_WM5110 190 case WM5110: 191 aod = &wm5110_aod; 192 irq = &wm5110_irq; 193 194 switch (arizona->rev) { 195 case 0: 196 case 1: 197 ctrlif_error = false; 198 break; 199 default: 200 break; 201 } 202 break; 203 #endif 204 default: 205 BUG_ON("Unknown Arizona class device" == NULL); 206 return -EINVAL; 207 } 208 209 if (arizona->pdata.irq_active_high) { 210 ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1, 211 ARIZONA_IRQ_POL, 0); 212 if (ret != 0) { 213 dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n", 214 ret); 215 goto err; 216 } 217 218 flags |= IRQF_TRIGGER_HIGH; 219 } else { 220 flags |= IRQF_TRIGGER_LOW; 221 } 222 223 /* Allocate a virtual IRQ domain to distribute to the regmap domains */ 224 arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops, 225 arizona); 226 if (!arizona->virq) { 227 ret = -EINVAL; 228 goto err; 229 } 230 231 ret = regmap_add_irq_chip(arizona->regmap, 232 irq_create_mapping(arizona->virq, 0), 233 IRQF_ONESHOT, -1, aod, 234 &arizona->aod_irq_chip); 235 if (ret != 0) { 236 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret); 237 goto err_domain; 238 } 239 240 ret = regmap_add_irq_chip(arizona->regmap, 241 irq_create_mapping(arizona->virq, 1), 242 IRQF_ONESHOT, -1, irq, 243 &arizona->irq_chip); 244 if (ret != 0) { 245 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret); 246 goto err_aod; 247 } 248 249 /* Make sure the boot done IRQ is unmasked for resumes */ 250 i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE); 251 ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT, 252 "Boot done", arizona); 253 if (ret != 0) { 254 dev_err(arizona->dev, "Failed to request boot done %d: %d\n", 255 arizona->irq, ret); 256 goto err_boot_done; 257 } 258 259 /* Handle control interface errors in the core */ 260 if (ctrlif_error) { 261 i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR); 262 ret = request_threaded_irq(i, NULL, arizona_ctrlif_err, 263 IRQF_ONESHOT, 264 "Control interface error", arizona); 265 if (ret != 0) { 266 dev_err(arizona->dev, 267 "Failed to request CTRLIF_ERR %d: %d\n", 268 arizona->irq, ret); 269 goto err_ctrlif; 270 } 271 } 272 273 ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread, 274 flags, "arizona", arizona); 275 276 if (ret != 0) { 277 dev_err(arizona->dev, "Failed to request IRQ %d: %d\n", 278 arizona->irq, ret); 279 goto err_main_irq; 280 } 281 282 return 0; 283 284 err_main_irq: 285 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona); 286 err_ctrlif: 287 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona); 288 err_boot_done: 289 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1), 290 arizona->irq_chip); 291 err_aod: 292 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0), 293 arizona->aod_irq_chip); 294 err_domain: 295 err: 296 return ret; 297 } 298 299 int arizona_irq_exit(struct arizona *arizona) 300 { 301 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona); 302 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona); 303 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1), 304 arizona->irq_chip); 305 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0), 306 arizona->aod_irq_chip); 307 free_irq(arizona->irq, arizona); 308 309 return 0; 310 } 311