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 ctrlif_error = false; 182 break; 183 default: 184 break; 185 } 186 break; 187 #endif 188 #ifdef CONFIG_MFD_WM5110 189 case WM5110: 190 aod = &wm5110_aod; 191 irq = &wm5110_irq; 192 193 switch (arizona->rev) { 194 case 0: 195 case 1: 196 ctrlif_error = false; 197 break; 198 default: 199 break; 200 } 201 break; 202 #endif 203 default: 204 BUG_ON("Unknown Arizona class device" == NULL); 205 return -EINVAL; 206 } 207 208 if (arizona->pdata.irq_active_high) { 209 ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1, 210 ARIZONA_IRQ_POL, 0); 211 if (ret != 0) { 212 dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n", 213 ret); 214 goto err; 215 } 216 217 flags |= IRQF_TRIGGER_HIGH; 218 } else { 219 flags |= IRQF_TRIGGER_LOW; 220 } 221 222 /* Allocate a virtual IRQ domain to distribute to the regmap domains */ 223 arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops, 224 arizona); 225 if (!arizona->virq) { 226 ret = -EINVAL; 227 goto err; 228 } 229 230 ret = regmap_add_irq_chip(arizona->regmap, 231 irq_create_mapping(arizona->virq, 0), 232 IRQF_ONESHOT, -1, aod, 233 &arizona->aod_irq_chip); 234 if (ret != 0) { 235 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret); 236 goto err_domain; 237 } 238 239 ret = regmap_add_irq_chip(arizona->regmap, 240 irq_create_mapping(arizona->virq, 1), 241 IRQF_ONESHOT, -1, irq, 242 &arizona->irq_chip); 243 if (ret != 0) { 244 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret); 245 goto err_aod; 246 } 247 248 /* Make sure the boot done IRQ is unmasked for resumes */ 249 i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE); 250 ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT, 251 "Boot done", arizona); 252 if (ret != 0) { 253 dev_err(arizona->dev, "Failed to request boot done %d: %d\n", 254 arizona->irq, ret); 255 goto err_boot_done; 256 } 257 258 /* Handle control interface errors in the core */ 259 if (ctrlif_error) { 260 i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR); 261 ret = request_threaded_irq(i, NULL, arizona_ctrlif_err, 262 IRQF_ONESHOT, 263 "Control interface error", arizona); 264 if (ret != 0) { 265 dev_err(arizona->dev, 266 "Failed to request CTRLIF_ERR %d: %d\n", 267 arizona->irq, ret); 268 goto err_ctrlif; 269 } 270 } 271 272 ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread, 273 flags, "arizona", arizona); 274 275 if (ret != 0) { 276 dev_err(arizona->dev, "Failed to request IRQ %d: %d\n", 277 arizona->irq, ret); 278 goto err_main_irq; 279 } 280 281 return 0; 282 283 err_main_irq: 284 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona); 285 err_ctrlif: 286 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona); 287 err_boot_done: 288 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1), 289 arizona->irq_chip); 290 err_aod: 291 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0), 292 arizona->aod_irq_chip); 293 err_domain: 294 err: 295 return ret; 296 } 297 298 int arizona_irq_exit(struct arizona *arizona) 299 { 300 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona); 301 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona); 302 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1), 303 arizona->irq_chip); 304 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0), 305 arizona->aod_irq_chip); 306 free_irq(arizona->irq, arizona); 307 308 return 0; 309 } 310