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 ctrlif_error = false; 180 break; 181 #endif 182 #ifdef CONFIG_MFD_WM5110 183 case WM5110: 184 aod = &wm5110_aod; 185 irq = &wm5110_irq; 186 187 ctrlif_error = false; 188 break; 189 #endif 190 default: 191 BUG_ON("Unknown Arizona class device" == NULL); 192 return -EINVAL; 193 } 194 195 if (arizona->pdata.irq_active_high) { 196 ret = regmap_update_bits(arizona->regmap, ARIZONA_IRQ_CTRL_1, 197 ARIZONA_IRQ_POL, 0); 198 if (ret != 0) { 199 dev_err(arizona->dev, "Couldn't set IRQ polarity: %d\n", 200 ret); 201 goto err; 202 } 203 204 flags |= IRQF_TRIGGER_HIGH; 205 } else { 206 flags |= IRQF_TRIGGER_LOW; 207 } 208 209 /* Allocate a virtual IRQ domain to distribute to the regmap domains */ 210 arizona->virq = irq_domain_add_linear(NULL, 2, &arizona_domain_ops, 211 arizona); 212 if (!arizona->virq) { 213 dev_err(arizona->dev, "Failed to add core IRQ domain\n"); 214 ret = -EINVAL; 215 goto err; 216 } 217 218 ret = regmap_add_irq_chip(arizona->regmap, 219 irq_create_mapping(arizona->virq, 0), 220 IRQF_ONESHOT, -1, aod, 221 &arizona->aod_irq_chip); 222 if (ret != 0) { 223 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret); 224 goto err_domain; 225 } 226 227 ret = regmap_add_irq_chip(arizona->regmap, 228 irq_create_mapping(arizona->virq, 1), 229 IRQF_ONESHOT, -1, irq, 230 &arizona->irq_chip); 231 if (ret != 0) { 232 dev_err(arizona->dev, "Failed to add AOD IRQs: %d\n", ret); 233 goto err_aod; 234 } 235 236 /* Make sure the boot done IRQ is unmasked for resumes */ 237 i = arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE); 238 ret = request_threaded_irq(i, NULL, arizona_boot_done, IRQF_ONESHOT, 239 "Boot done", arizona); 240 if (ret != 0) { 241 dev_err(arizona->dev, "Failed to request boot done %d: %d\n", 242 arizona->irq, ret); 243 goto err_boot_done; 244 } 245 246 /* Handle control interface errors in the core */ 247 if (ctrlif_error) { 248 i = arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR); 249 ret = request_threaded_irq(i, NULL, arizona_ctrlif_err, 250 IRQF_ONESHOT, 251 "Control interface error", arizona); 252 if (ret != 0) { 253 dev_err(arizona->dev, 254 "Failed to request CTRLIF_ERR %d: %d\n", 255 arizona->irq, ret); 256 goto err_ctrlif; 257 } 258 } 259 260 ret = request_threaded_irq(arizona->irq, NULL, arizona_irq_thread, 261 flags, "arizona", arizona); 262 263 if (ret != 0) { 264 dev_err(arizona->dev, "Failed to request IRQ %d: %d\n", 265 arizona->irq, ret); 266 goto err_main_irq; 267 } 268 269 return 0; 270 271 err_main_irq: 272 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona); 273 err_ctrlif: 274 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona); 275 err_boot_done: 276 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1), 277 arizona->irq_chip); 278 err_aod: 279 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0), 280 arizona->aod_irq_chip); 281 err_domain: 282 err: 283 return ret; 284 } 285 286 int arizona_irq_exit(struct arizona *arizona) 287 { 288 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_CTRLIF_ERR), arizona); 289 free_irq(arizona_map_irq(arizona, ARIZONA_IRQ_BOOT_DONE), arizona); 290 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 1), 291 arizona->irq_chip); 292 regmap_del_irq_chip(irq_create_mapping(arizona->virq, 0), 293 arizona->aod_irq_chip); 294 free_irq(arizona->irq, arizona); 295 296 return 0; 297 } 298