1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2018 Spreadtrum Communications Inc. 4 * Copyright (C) 2018 Linaro Ltd. 5 */ 6 7 #include <linux/gpio/driver.h> 8 #include <linux/interrupt.h> 9 #include <linux/kernel.h> 10 #include <linux/module.h> 11 #include <linux/of_device.h> 12 #include <linux/platform_device.h> 13 #include <linux/regmap.h> 14 15 /* EIC registers definition */ 16 #define SPRD_PMIC_EIC_DATA 0x0 17 #define SPRD_PMIC_EIC_DMSK 0x4 18 #define SPRD_PMIC_EIC_IEV 0x14 19 #define SPRD_PMIC_EIC_IE 0x18 20 #define SPRD_PMIC_EIC_RIS 0x1c 21 #define SPRD_PMIC_EIC_MIS 0x20 22 #define SPRD_PMIC_EIC_IC 0x24 23 #define SPRD_PMIC_EIC_TRIG 0x28 24 #define SPRD_PMIC_EIC_CTRL0 0x40 25 26 /* 27 * The PMIC EIC controller only has one bank, and each bank now can contain 28 * 16 EICs. 29 */ 30 #define SPRD_PMIC_EIC_PER_BANK_NR 16 31 #define SPRD_PMIC_EIC_NR SPRD_PMIC_EIC_PER_BANK_NR 32 #define SPRD_PMIC_EIC_DATA_MASK GENMASK(15, 0) 33 #define SPRD_PMIC_EIC_BIT(x) ((x) & (SPRD_PMIC_EIC_PER_BANK_NR - 1)) 34 #define SPRD_PMIC_EIC_DBNC_MASK GENMASK(11, 0) 35 36 /* 37 * These registers are modified under the irq bus lock and cached to avoid 38 * unnecessary writes in bus_sync_unlock. 39 */ 40 enum { 41 REG_IEV, 42 REG_IE, 43 REG_TRIG, 44 CACHE_NR_REGS 45 }; 46 47 /** 48 * struct sprd_pmic_eic - PMIC EIC controller 49 * @chip: the gpio_chip structure. 50 * @intc: the irq_chip structure. 51 * @map: the regmap from the parent device. 52 * @offset: the EIC controller's offset address of the PMIC. 53 * @reg: the array to cache the EIC registers. 54 * @buslock: for bus lock/sync and unlock. 55 * @irq: the interrupt number of the PMIC EIC conteroller. 56 */ 57 struct sprd_pmic_eic { 58 struct gpio_chip chip; 59 struct irq_chip intc; 60 struct regmap *map; 61 u32 offset; 62 u8 reg[CACHE_NR_REGS]; 63 struct mutex buslock; 64 int irq; 65 }; 66 67 static void sprd_pmic_eic_update(struct gpio_chip *chip, unsigned int offset, 68 u16 reg, unsigned int val) 69 { 70 struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip); 71 u32 shift = SPRD_PMIC_EIC_BIT(offset); 72 73 regmap_update_bits(pmic_eic->map, pmic_eic->offset + reg, 74 BIT(shift), val << shift); 75 } 76 77 static int sprd_pmic_eic_read(struct gpio_chip *chip, unsigned int offset, 78 u16 reg) 79 { 80 struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip); 81 u32 value; 82 int ret; 83 84 ret = regmap_read(pmic_eic->map, pmic_eic->offset + reg, &value); 85 if (ret) 86 return ret; 87 88 return !!(value & BIT(SPRD_PMIC_EIC_BIT(offset))); 89 } 90 91 static int sprd_pmic_eic_request(struct gpio_chip *chip, unsigned int offset) 92 { 93 sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_DMSK, 1); 94 return 0; 95 } 96 97 static void sprd_pmic_eic_free(struct gpio_chip *chip, unsigned int offset) 98 { 99 sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_DMSK, 0); 100 } 101 102 static int sprd_pmic_eic_get(struct gpio_chip *chip, unsigned int offset) 103 { 104 return sprd_pmic_eic_read(chip, offset, SPRD_PMIC_EIC_DATA); 105 } 106 107 static int sprd_pmic_eic_direction_input(struct gpio_chip *chip, 108 unsigned int offset) 109 { 110 /* EICs are always input, nothing need to do here. */ 111 return 0; 112 } 113 114 static void sprd_pmic_eic_set(struct gpio_chip *chip, unsigned int offset, 115 int value) 116 { 117 /* EICs are always input, nothing need to do here. */ 118 } 119 120 static int sprd_pmic_eic_set_debounce(struct gpio_chip *chip, 121 unsigned int offset, 122 unsigned int debounce) 123 { 124 struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip); 125 u32 reg, value; 126 int ret; 127 128 reg = SPRD_PMIC_EIC_CTRL0 + SPRD_PMIC_EIC_BIT(offset) * 0x4; 129 ret = regmap_read(pmic_eic->map, pmic_eic->offset + reg, &value); 130 if (ret) 131 return ret; 132 133 value &= ~SPRD_PMIC_EIC_DBNC_MASK; 134 value |= (debounce / 1000) & SPRD_PMIC_EIC_DBNC_MASK; 135 return regmap_write(pmic_eic->map, pmic_eic->offset + reg, value); 136 } 137 138 static int sprd_pmic_eic_set_config(struct gpio_chip *chip, unsigned int offset, 139 unsigned long config) 140 { 141 unsigned long param = pinconf_to_config_param(config); 142 u32 arg = pinconf_to_config_argument(config); 143 144 if (param == PIN_CONFIG_INPUT_DEBOUNCE) 145 return sprd_pmic_eic_set_debounce(chip, offset, arg); 146 147 return -ENOTSUPP; 148 } 149 150 static void sprd_pmic_eic_irq_mask(struct irq_data *data) 151 { 152 struct gpio_chip *chip = irq_data_get_irq_chip_data(data); 153 struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip); 154 155 pmic_eic->reg[REG_IE] = 0; 156 pmic_eic->reg[REG_TRIG] = 0; 157 } 158 159 static void sprd_pmic_eic_irq_unmask(struct irq_data *data) 160 { 161 struct gpio_chip *chip = irq_data_get_irq_chip_data(data); 162 struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip); 163 164 pmic_eic->reg[REG_IE] = 1; 165 pmic_eic->reg[REG_TRIG] = 1; 166 } 167 168 static int sprd_pmic_eic_irq_set_type(struct irq_data *data, 169 unsigned int flow_type) 170 { 171 struct gpio_chip *chip = irq_data_get_irq_chip_data(data); 172 struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip); 173 174 switch (flow_type) { 175 case IRQ_TYPE_LEVEL_HIGH: 176 pmic_eic->reg[REG_IEV] = 1; 177 break; 178 case IRQ_TYPE_LEVEL_LOW: 179 pmic_eic->reg[REG_IEV] = 0; 180 break; 181 case IRQ_TYPE_EDGE_RISING: 182 case IRQ_TYPE_EDGE_FALLING: 183 case IRQ_TYPE_EDGE_BOTH: 184 /* 185 * Will set the trigger level according to current EIC level 186 * in irq_bus_sync_unlock() interface, so here nothing to do. 187 */ 188 break; 189 default: 190 return -ENOTSUPP; 191 } 192 193 return 0; 194 } 195 196 static void sprd_pmic_eic_bus_lock(struct irq_data *data) 197 { 198 struct gpio_chip *chip = irq_data_get_irq_chip_data(data); 199 struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip); 200 201 mutex_lock(&pmic_eic->buslock); 202 } 203 204 static void sprd_pmic_eic_bus_sync_unlock(struct irq_data *data) 205 { 206 struct gpio_chip *chip = irq_data_get_irq_chip_data(data); 207 struct sprd_pmic_eic *pmic_eic = gpiochip_get_data(chip); 208 u32 trigger = irqd_get_trigger_type(data); 209 u32 offset = irqd_to_hwirq(data); 210 int state; 211 212 /* Set irq type */ 213 if (trigger & IRQ_TYPE_EDGE_BOTH) { 214 state = sprd_pmic_eic_get(chip, offset); 215 if (state) 216 sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IEV, 0); 217 else 218 sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IEV, 1); 219 } else { 220 sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IEV, 221 pmic_eic->reg[REG_IEV]); 222 } 223 224 /* Set irq unmask */ 225 sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IE, 226 pmic_eic->reg[REG_IE]); 227 /* Generate trigger start pulse for debounce EIC */ 228 sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_TRIG, 229 pmic_eic->reg[REG_TRIG]); 230 231 mutex_unlock(&pmic_eic->buslock); 232 } 233 234 static void sprd_pmic_eic_toggle_trigger(struct gpio_chip *chip, 235 unsigned int irq, unsigned int offset) 236 { 237 u32 trigger = irq_get_trigger_type(irq); 238 int state, post_state; 239 240 if (!(trigger & IRQ_TYPE_EDGE_BOTH)) 241 return; 242 243 state = sprd_pmic_eic_get(chip, offset); 244 retry: 245 if (state) 246 sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IEV, 0); 247 else 248 sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IEV, 1); 249 250 post_state = sprd_pmic_eic_get(chip, offset); 251 if (state != post_state) { 252 dev_warn(chip->parent, "PMIC EIC level was changed.\n"); 253 state = post_state; 254 goto retry; 255 } 256 257 /* Set irq unmask */ 258 sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_IE, 1); 259 /* Generate trigger start pulse for debounce EIC */ 260 sprd_pmic_eic_update(chip, offset, SPRD_PMIC_EIC_TRIG, 1); 261 } 262 263 static irqreturn_t sprd_pmic_eic_irq_handler(int irq, void *data) 264 { 265 struct sprd_pmic_eic *pmic_eic = data; 266 struct gpio_chip *chip = &pmic_eic->chip; 267 unsigned long status; 268 u32 n, girq, val; 269 int ret; 270 271 ret = regmap_read(pmic_eic->map, pmic_eic->offset + SPRD_PMIC_EIC_MIS, 272 &val); 273 if (ret) 274 return IRQ_RETVAL(ret); 275 276 status = val & SPRD_PMIC_EIC_DATA_MASK; 277 278 for_each_set_bit(n, &status, chip->ngpio) { 279 /* Clear the interrupt */ 280 sprd_pmic_eic_update(chip, n, SPRD_PMIC_EIC_IC, 1); 281 282 girq = irq_find_mapping(chip->irq.domain, n); 283 handle_nested_irq(girq); 284 285 /* 286 * The PMIC EIC can only support level trigger, so we can 287 * toggle the level trigger to emulate the edge trigger. 288 */ 289 sprd_pmic_eic_toggle_trigger(chip, girq, n); 290 } 291 292 return IRQ_HANDLED; 293 } 294 295 static int sprd_pmic_eic_probe(struct platform_device *pdev) 296 { 297 struct gpio_irq_chip *irq; 298 struct sprd_pmic_eic *pmic_eic; 299 int ret; 300 301 pmic_eic = devm_kzalloc(&pdev->dev, sizeof(*pmic_eic), GFP_KERNEL); 302 if (!pmic_eic) 303 return -ENOMEM; 304 305 mutex_init(&pmic_eic->buslock); 306 307 pmic_eic->irq = platform_get_irq(pdev, 0); 308 if (pmic_eic->irq < 0) 309 return pmic_eic->irq; 310 311 pmic_eic->map = dev_get_regmap(pdev->dev.parent, NULL); 312 if (!pmic_eic->map) 313 return -ENODEV; 314 315 ret = of_property_read_u32(pdev->dev.of_node, "reg", &pmic_eic->offset); 316 if (ret) { 317 dev_err(&pdev->dev, "Failed to get PMIC EIC base address.\n"); 318 return ret; 319 } 320 321 ret = devm_request_threaded_irq(&pdev->dev, pmic_eic->irq, NULL, 322 sprd_pmic_eic_irq_handler, 323 IRQF_ONESHOT | IRQF_NO_SUSPEND, 324 dev_name(&pdev->dev), pmic_eic); 325 if (ret) { 326 dev_err(&pdev->dev, "Failed to request PMIC EIC IRQ.\n"); 327 return ret; 328 } 329 330 pmic_eic->chip.label = dev_name(&pdev->dev); 331 pmic_eic->chip.ngpio = SPRD_PMIC_EIC_NR; 332 pmic_eic->chip.base = -1; 333 pmic_eic->chip.parent = &pdev->dev; 334 pmic_eic->chip.direction_input = sprd_pmic_eic_direction_input; 335 pmic_eic->chip.request = sprd_pmic_eic_request; 336 pmic_eic->chip.free = sprd_pmic_eic_free; 337 pmic_eic->chip.set_config = sprd_pmic_eic_set_config; 338 pmic_eic->chip.set = sprd_pmic_eic_set; 339 pmic_eic->chip.get = sprd_pmic_eic_get; 340 341 pmic_eic->intc.name = dev_name(&pdev->dev); 342 pmic_eic->intc.irq_mask = sprd_pmic_eic_irq_mask; 343 pmic_eic->intc.irq_unmask = sprd_pmic_eic_irq_unmask; 344 pmic_eic->intc.irq_set_type = sprd_pmic_eic_irq_set_type; 345 pmic_eic->intc.irq_bus_lock = sprd_pmic_eic_bus_lock; 346 pmic_eic->intc.irq_bus_sync_unlock = sprd_pmic_eic_bus_sync_unlock; 347 pmic_eic->intc.flags = IRQCHIP_SKIP_SET_WAKE; 348 349 irq = &pmic_eic->chip.irq; 350 irq->chip = &pmic_eic->intc; 351 irq->threaded = true; 352 353 ret = devm_gpiochip_add_data(&pdev->dev, &pmic_eic->chip, pmic_eic); 354 if (ret < 0) { 355 dev_err(&pdev->dev, "Could not register gpiochip %d.\n", ret); 356 return ret; 357 } 358 359 platform_set_drvdata(pdev, pmic_eic); 360 return 0; 361 } 362 363 static const struct of_device_id sprd_pmic_eic_of_match[] = { 364 { .compatible = "sprd,sc2731-eic", }, 365 { /* end of list */ } 366 }; 367 MODULE_DEVICE_TABLE(of, sprd_pmic_eic_of_match); 368 369 static struct platform_driver sprd_pmic_eic_driver = { 370 .probe = sprd_pmic_eic_probe, 371 .driver = { 372 .name = "sprd-pmic-eic", 373 .of_match_table = sprd_pmic_eic_of_match, 374 }, 375 }; 376 377 module_platform_driver(sprd_pmic_eic_driver); 378 379 MODULE_DESCRIPTION("Spreadtrum PMIC EIC driver"); 380 MODULE_LICENSE("GPL v2"); 381