1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * arch/arm/mach-tegra/gpio.c 4 * 5 * Copyright (c) 2010 Google, Inc 6 * Copyright (c) 2011-2016, NVIDIA CORPORATION. All rights reserved. 7 * 8 * Author: 9 * Erik Gilling <konkers@google.com> 10 */ 11 12 #include <linux/err.h> 13 #include <linux/init.h> 14 #include <linux/irq.h> 15 #include <linux/interrupt.h> 16 #include <linux/io.h> 17 #include <linux/gpio/driver.h> 18 #include <linux/of.h> 19 #include <linux/platform_device.h> 20 #include <linux/module.h> 21 #include <linux/seq_file.h> 22 #include <linux/irqdomain.h> 23 #include <linux/irqchip/chained_irq.h> 24 #include <linux/pinctrl/consumer.h> 25 #include <linux/pm.h> 26 27 #define GPIO_BANK(x) ((x) >> 5) 28 #define GPIO_PORT(x) (((x) >> 3) & 0x3) 29 #define GPIO_BIT(x) ((x) & 0x7) 30 31 #define GPIO_REG(tgi, x) (GPIO_BANK(x) * tgi->soc->bank_stride + \ 32 GPIO_PORT(x) * 4) 33 34 #define GPIO_CNF(t, x) (GPIO_REG(t, x) + 0x00) 35 #define GPIO_OE(t, x) (GPIO_REG(t, x) + 0x10) 36 #define GPIO_OUT(t, x) (GPIO_REG(t, x) + 0X20) 37 #define GPIO_IN(t, x) (GPIO_REG(t, x) + 0x30) 38 #define GPIO_INT_STA(t, x) (GPIO_REG(t, x) + 0x40) 39 #define GPIO_INT_ENB(t, x) (GPIO_REG(t, x) + 0x50) 40 #define GPIO_INT_LVL(t, x) (GPIO_REG(t, x) + 0x60) 41 #define GPIO_INT_CLR(t, x) (GPIO_REG(t, x) + 0x70) 42 #define GPIO_DBC_CNT(t, x) (GPIO_REG(t, x) + 0xF0) 43 44 45 #define GPIO_MSK_CNF(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x00) 46 #define GPIO_MSK_OE(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x10) 47 #define GPIO_MSK_OUT(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0X20) 48 #define GPIO_MSK_DBC_EN(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x30) 49 #define GPIO_MSK_INT_STA(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x40) 50 #define GPIO_MSK_INT_ENB(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x50) 51 #define GPIO_MSK_INT_LVL(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x60) 52 53 #define GPIO_INT_LVL_MASK 0x010101 54 #define GPIO_INT_LVL_EDGE_RISING 0x000101 55 #define GPIO_INT_LVL_EDGE_FALLING 0x000100 56 #define GPIO_INT_LVL_EDGE_BOTH 0x010100 57 #define GPIO_INT_LVL_LEVEL_HIGH 0x000001 58 #define GPIO_INT_LVL_LEVEL_LOW 0x000000 59 60 struct tegra_gpio_info; 61 62 struct tegra_gpio_bank { 63 unsigned int bank; 64 65 /* 66 * IRQ-core code uses raw locking, and thus, nested locking also 67 * should be raw in order not to trip spinlock debug warnings. 68 */ 69 raw_spinlock_t lvl_lock[4]; 70 71 /* Lock for updating debounce count register */ 72 spinlock_t dbc_lock[4]; 73 74 #ifdef CONFIG_PM_SLEEP 75 u32 cnf[4]; 76 u32 out[4]; 77 u32 oe[4]; 78 u32 int_enb[4]; 79 u32 int_lvl[4]; 80 u32 wake_enb[4]; 81 u32 dbc_enb[4]; 82 #endif 83 u32 dbc_cnt[4]; 84 }; 85 86 struct tegra_gpio_soc_config { 87 bool debounce_supported; 88 u32 bank_stride; 89 u32 upper_offset; 90 }; 91 92 struct tegra_gpio_info { 93 struct device *dev; 94 void __iomem *regs; 95 struct tegra_gpio_bank *bank_info; 96 const struct tegra_gpio_soc_config *soc; 97 struct gpio_chip gc; 98 u32 bank_count; 99 unsigned int *irqs; 100 }; 101 102 static inline void tegra_gpio_writel(struct tegra_gpio_info *tgi, 103 u32 val, u32 reg) 104 { 105 writel_relaxed(val, tgi->regs + reg); 106 } 107 108 static inline u32 tegra_gpio_readl(struct tegra_gpio_info *tgi, u32 reg) 109 { 110 return readl_relaxed(tgi->regs + reg); 111 } 112 113 static unsigned int tegra_gpio_compose(unsigned int bank, unsigned int port, 114 unsigned int bit) 115 { 116 return (bank << 5) | ((port & 0x3) << 3) | (bit & 0x7); 117 } 118 119 static void tegra_gpio_mask_write(struct tegra_gpio_info *tgi, u32 reg, 120 unsigned int gpio, u32 value) 121 { 122 u32 val; 123 124 val = 0x100 << GPIO_BIT(gpio); 125 if (value) 126 val |= 1 << GPIO_BIT(gpio); 127 tegra_gpio_writel(tgi, val, reg); 128 } 129 130 static void tegra_gpio_enable(struct tegra_gpio_info *tgi, unsigned int gpio) 131 { 132 tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 1); 133 } 134 135 static void tegra_gpio_disable(struct tegra_gpio_info *tgi, unsigned int gpio) 136 { 137 tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 0); 138 } 139 140 static void tegra_gpio_free(struct gpio_chip *chip, unsigned int offset) 141 { 142 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 143 144 pinctrl_gpio_free(chip, offset); 145 tegra_gpio_disable(tgi, offset); 146 } 147 148 static void tegra_gpio_set(struct gpio_chip *chip, unsigned int offset, 149 int value) 150 { 151 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 152 153 tegra_gpio_mask_write(tgi, GPIO_MSK_OUT(tgi, offset), offset, value); 154 } 155 156 static int tegra_gpio_get(struct gpio_chip *chip, unsigned int offset) 157 { 158 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 159 unsigned int bval = BIT(GPIO_BIT(offset)); 160 161 /* If gpio is in output mode then read from the out value */ 162 if (tegra_gpio_readl(tgi, GPIO_OE(tgi, offset)) & bval) 163 return !!(tegra_gpio_readl(tgi, GPIO_OUT(tgi, offset)) & bval); 164 165 return !!(tegra_gpio_readl(tgi, GPIO_IN(tgi, offset)) & bval); 166 } 167 168 static int tegra_gpio_direction_input(struct gpio_chip *chip, 169 unsigned int offset) 170 { 171 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 172 int ret; 173 174 tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, offset), offset, 0); 175 tegra_gpio_enable(tgi, offset); 176 177 ret = pinctrl_gpio_direction_input(chip, offset); 178 if (ret < 0) 179 dev_err(tgi->dev, 180 "Failed to set pinctrl input direction of GPIO %d: %d", 181 chip->base + offset, ret); 182 183 return ret; 184 } 185 186 static int tegra_gpio_direction_output(struct gpio_chip *chip, 187 unsigned int offset, 188 int value) 189 { 190 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 191 int ret; 192 193 tegra_gpio_set(chip, offset, value); 194 tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, offset), offset, 1); 195 tegra_gpio_enable(tgi, offset); 196 197 ret = pinctrl_gpio_direction_output(chip, offset); 198 if (ret < 0) 199 dev_err(tgi->dev, 200 "Failed to set pinctrl output direction of GPIO %d: %d", 201 chip->base + offset, ret); 202 203 return ret; 204 } 205 206 static int tegra_gpio_get_direction(struct gpio_chip *chip, 207 unsigned int offset) 208 { 209 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 210 u32 pin_mask = BIT(GPIO_BIT(offset)); 211 u32 cnf, oe; 212 213 cnf = tegra_gpio_readl(tgi, GPIO_CNF(tgi, offset)); 214 if (!(cnf & pin_mask)) 215 return -EINVAL; 216 217 oe = tegra_gpio_readl(tgi, GPIO_OE(tgi, offset)); 218 219 if (oe & pin_mask) 220 return GPIO_LINE_DIRECTION_OUT; 221 222 return GPIO_LINE_DIRECTION_IN; 223 } 224 225 static int tegra_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset, 226 unsigned int debounce) 227 { 228 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 229 struct tegra_gpio_bank *bank = &tgi->bank_info[GPIO_BANK(offset)]; 230 unsigned int debounce_ms = DIV_ROUND_UP(debounce, 1000); 231 unsigned long flags; 232 unsigned int port; 233 234 if (!debounce_ms) { 235 tegra_gpio_mask_write(tgi, GPIO_MSK_DBC_EN(tgi, offset), 236 offset, 0); 237 return 0; 238 } 239 240 debounce_ms = min(debounce_ms, 255U); 241 port = GPIO_PORT(offset); 242 243 /* There is only one debounce count register per port and hence 244 * set the maximum of current and requested debounce time. 245 */ 246 spin_lock_irqsave(&bank->dbc_lock[port], flags); 247 if (bank->dbc_cnt[port] < debounce_ms) { 248 tegra_gpio_writel(tgi, debounce_ms, GPIO_DBC_CNT(tgi, offset)); 249 bank->dbc_cnt[port] = debounce_ms; 250 } 251 spin_unlock_irqrestore(&bank->dbc_lock[port], flags); 252 253 tegra_gpio_mask_write(tgi, GPIO_MSK_DBC_EN(tgi, offset), offset, 1); 254 255 return 0; 256 } 257 258 static int tegra_gpio_set_config(struct gpio_chip *chip, unsigned int offset, 259 unsigned long config) 260 { 261 u32 debounce; 262 263 if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE) 264 return -ENOTSUPP; 265 266 debounce = pinconf_to_config_argument(config); 267 return tegra_gpio_set_debounce(chip, offset, debounce); 268 } 269 270 static void tegra_gpio_irq_ack(struct irq_data *d) 271 { 272 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 273 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 274 unsigned int gpio = d->hwirq; 275 276 tegra_gpio_writel(tgi, 1 << GPIO_BIT(gpio), GPIO_INT_CLR(tgi, gpio)); 277 } 278 279 static void tegra_gpio_irq_mask(struct irq_data *d) 280 { 281 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 282 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 283 unsigned int gpio = d->hwirq; 284 285 tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 0); 286 gpiochip_disable_irq(chip, gpio); 287 } 288 289 static void tegra_gpio_irq_unmask(struct irq_data *d) 290 { 291 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 292 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 293 unsigned int gpio = d->hwirq; 294 295 gpiochip_enable_irq(chip, gpio); 296 tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 1); 297 } 298 299 static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type) 300 { 301 unsigned int gpio = d->hwirq, port = GPIO_PORT(gpio), lvl_type; 302 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 303 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 304 struct tegra_gpio_bank *bank; 305 unsigned long flags; 306 int ret; 307 u32 val; 308 309 bank = &tgi->bank_info[GPIO_BANK(d->hwirq)]; 310 311 switch (type & IRQ_TYPE_SENSE_MASK) { 312 case IRQ_TYPE_EDGE_RISING: 313 lvl_type = GPIO_INT_LVL_EDGE_RISING; 314 break; 315 316 case IRQ_TYPE_EDGE_FALLING: 317 lvl_type = GPIO_INT_LVL_EDGE_FALLING; 318 break; 319 320 case IRQ_TYPE_EDGE_BOTH: 321 lvl_type = GPIO_INT_LVL_EDGE_BOTH; 322 break; 323 324 case IRQ_TYPE_LEVEL_HIGH: 325 lvl_type = GPIO_INT_LVL_LEVEL_HIGH; 326 break; 327 328 case IRQ_TYPE_LEVEL_LOW: 329 lvl_type = GPIO_INT_LVL_LEVEL_LOW; 330 break; 331 332 default: 333 return -EINVAL; 334 } 335 336 raw_spin_lock_irqsave(&bank->lvl_lock[port], flags); 337 338 val = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio)); 339 val &= ~(GPIO_INT_LVL_MASK << GPIO_BIT(gpio)); 340 val |= lvl_type << GPIO_BIT(gpio); 341 tegra_gpio_writel(tgi, val, GPIO_INT_LVL(tgi, gpio)); 342 343 raw_spin_unlock_irqrestore(&bank->lvl_lock[port], flags); 344 345 tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, gpio), gpio, 0); 346 tegra_gpio_enable(tgi, gpio); 347 348 ret = gpiochip_lock_as_irq(&tgi->gc, gpio); 349 if (ret) { 350 dev_err(tgi->dev, 351 "unable to lock Tegra GPIO %u as IRQ\n", gpio); 352 tegra_gpio_disable(tgi, gpio); 353 return ret; 354 } 355 356 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH)) 357 irq_set_handler_locked(d, handle_level_irq); 358 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) 359 irq_set_handler_locked(d, handle_edge_irq); 360 361 if (d->parent_data) 362 ret = irq_chip_set_type_parent(d, type); 363 364 return ret; 365 } 366 367 static void tegra_gpio_irq_shutdown(struct irq_data *d) 368 { 369 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 370 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 371 unsigned int gpio = d->hwirq; 372 373 tegra_gpio_irq_mask(d); 374 gpiochip_unlock_as_irq(&tgi->gc, gpio); 375 } 376 377 static void tegra_gpio_irq_handler(struct irq_desc *desc) 378 { 379 struct tegra_gpio_info *tgi = irq_desc_get_handler_data(desc); 380 struct irq_chip *chip = irq_desc_get_chip(desc); 381 struct irq_domain *domain = tgi->gc.irq.domain; 382 unsigned int irq = irq_desc_get_irq(desc); 383 struct tegra_gpio_bank *bank = NULL; 384 unsigned int port, pin, gpio, i; 385 bool unmasked = false; 386 unsigned long sta; 387 u32 lvl; 388 389 for (i = 0; i < tgi->bank_count; i++) { 390 if (tgi->irqs[i] == irq) { 391 bank = &tgi->bank_info[i]; 392 break; 393 } 394 } 395 396 if (WARN_ON(bank == NULL)) 397 return; 398 399 chained_irq_enter(chip, desc); 400 401 for (port = 0; port < 4; port++) { 402 gpio = tegra_gpio_compose(bank->bank, port, 0); 403 sta = tegra_gpio_readl(tgi, GPIO_INT_STA(tgi, gpio)) & 404 tegra_gpio_readl(tgi, GPIO_INT_ENB(tgi, gpio)); 405 lvl = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio)); 406 407 for_each_set_bit(pin, &sta, 8) { 408 int ret; 409 410 tegra_gpio_writel(tgi, 1 << pin, 411 GPIO_INT_CLR(tgi, gpio)); 412 413 /* if gpio is edge triggered, clear condition 414 * before executing the handler so that we don't 415 * miss edges 416 */ 417 if (!unmasked && lvl & (0x100 << pin)) { 418 unmasked = true; 419 chained_irq_exit(chip, desc); 420 } 421 422 ret = generic_handle_domain_irq(domain, gpio + pin); 423 WARN_RATELIMIT(ret, "hwirq = %d", gpio + pin); 424 } 425 } 426 427 if (!unmasked) 428 chained_irq_exit(chip, desc); 429 } 430 431 static int tegra_gpio_child_to_parent_hwirq(struct gpio_chip *chip, 432 unsigned int hwirq, 433 unsigned int type, 434 unsigned int *parent_hwirq, 435 unsigned int *parent_type) 436 { 437 *parent_hwirq = chip->irq.child_offset_to_irq(chip, hwirq); 438 *parent_type = type; 439 440 return 0; 441 } 442 443 static int tegra_gpio_populate_parent_fwspec(struct gpio_chip *chip, 444 union gpio_irq_fwspec *gfwspec, 445 unsigned int parent_hwirq, 446 unsigned int parent_type) 447 { 448 struct irq_fwspec *fwspec = &gfwspec->fwspec; 449 450 fwspec->fwnode = chip->irq.parent_domain->fwnode; 451 fwspec->param_count = 3; 452 fwspec->param[0] = 0; 453 fwspec->param[1] = parent_hwirq; 454 fwspec->param[2] = parent_type; 455 456 return 0; 457 } 458 459 #ifdef CONFIG_PM_SLEEP 460 static int tegra_gpio_resume(struct device *dev) 461 { 462 struct tegra_gpio_info *tgi = dev_get_drvdata(dev); 463 unsigned int b, p; 464 465 for (b = 0; b < tgi->bank_count; b++) { 466 struct tegra_gpio_bank *bank = &tgi->bank_info[b]; 467 468 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) { 469 unsigned int gpio = (b << 5) | (p << 3); 470 471 tegra_gpio_writel(tgi, bank->cnf[p], 472 GPIO_CNF(tgi, gpio)); 473 474 if (tgi->soc->debounce_supported) { 475 tegra_gpio_writel(tgi, bank->dbc_cnt[p], 476 GPIO_DBC_CNT(tgi, gpio)); 477 tegra_gpio_writel(tgi, bank->dbc_enb[p], 478 GPIO_MSK_DBC_EN(tgi, gpio)); 479 } 480 481 tegra_gpio_writel(tgi, bank->out[p], 482 GPIO_OUT(tgi, gpio)); 483 tegra_gpio_writel(tgi, bank->oe[p], 484 GPIO_OE(tgi, gpio)); 485 tegra_gpio_writel(tgi, bank->int_lvl[p], 486 GPIO_INT_LVL(tgi, gpio)); 487 tegra_gpio_writel(tgi, bank->int_enb[p], 488 GPIO_INT_ENB(tgi, gpio)); 489 } 490 } 491 492 return 0; 493 } 494 495 static int tegra_gpio_suspend(struct device *dev) 496 { 497 struct tegra_gpio_info *tgi = dev_get_drvdata(dev); 498 unsigned int b, p; 499 500 for (b = 0; b < tgi->bank_count; b++) { 501 struct tegra_gpio_bank *bank = &tgi->bank_info[b]; 502 503 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) { 504 unsigned int gpio = (b << 5) | (p << 3); 505 506 bank->cnf[p] = tegra_gpio_readl(tgi, 507 GPIO_CNF(tgi, gpio)); 508 bank->out[p] = tegra_gpio_readl(tgi, 509 GPIO_OUT(tgi, gpio)); 510 bank->oe[p] = tegra_gpio_readl(tgi, 511 GPIO_OE(tgi, gpio)); 512 if (tgi->soc->debounce_supported) { 513 bank->dbc_enb[p] = tegra_gpio_readl(tgi, 514 GPIO_MSK_DBC_EN(tgi, gpio)); 515 bank->dbc_enb[p] = (bank->dbc_enb[p] << 8) | 516 bank->dbc_enb[p]; 517 } 518 519 bank->int_enb[p] = tegra_gpio_readl(tgi, 520 GPIO_INT_ENB(tgi, gpio)); 521 bank->int_lvl[p] = tegra_gpio_readl(tgi, 522 GPIO_INT_LVL(tgi, gpio)); 523 524 /* Enable gpio irq for wake up source */ 525 tegra_gpio_writel(tgi, bank->wake_enb[p], 526 GPIO_INT_ENB(tgi, gpio)); 527 } 528 } 529 530 return 0; 531 } 532 533 static int tegra_gpio_irq_set_wake(struct irq_data *d, unsigned int enable) 534 { 535 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 536 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 537 struct tegra_gpio_bank *bank; 538 unsigned int gpio = d->hwirq; 539 u32 port, bit, mask; 540 int err; 541 542 bank = &tgi->bank_info[GPIO_BANK(d->hwirq)]; 543 544 port = GPIO_PORT(gpio); 545 bit = GPIO_BIT(gpio); 546 mask = BIT(bit); 547 548 err = irq_set_irq_wake(tgi->irqs[bank->bank], enable); 549 if (err) 550 return err; 551 552 if (d->parent_data) { 553 err = irq_chip_set_wake_parent(d, enable); 554 if (err) { 555 irq_set_irq_wake(tgi->irqs[bank->bank], !enable); 556 return err; 557 } 558 } 559 560 if (enable) 561 bank->wake_enb[port] |= mask; 562 else 563 bank->wake_enb[port] &= ~mask; 564 565 return 0; 566 } 567 #endif 568 569 static int tegra_gpio_irq_set_affinity(struct irq_data *data, 570 const struct cpumask *dest, 571 bool force) 572 { 573 if (data->parent_data) 574 return irq_chip_set_affinity_parent(data, dest, force); 575 576 return -EINVAL; 577 } 578 579 static int tegra_gpio_irq_request_resources(struct irq_data *d) 580 { 581 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 582 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 583 584 tegra_gpio_enable(tgi, d->hwirq); 585 586 return gpiochip_reqres_irq(chip, d->hwirq); 587 } 588 589 static void tegra_gpio_irq_release_resources(struct irq_data *d) 590 { 591 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 592 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 593 594 gpiochip_relres_irq(chip, d->hwirq); 595 tegra_gpio_enable(tgi, d->hwirq); 596 } 597 598 static void tegra_gpio_irq_print_chip(struct irq_data *d, struct seq_file *s) 599 { 600 struct gpio_chip *chip = irq_data_get_irq_chip_data(d); 601 602 seq_printf(s, dev_name(chip->parent)); 603 } 604 605 static const struct irq_chip tegra_gpio_irq_chip = { 606 .irq_shutdown = tegra_gpio_irq_shutdown, 607 .irq_ack = tegra_gpio_irq_ack, 608 .irq_mask = tegra_gpio_irq_mask, 609 .irq_unmask = tegra_gpio_irq_unmask, 610 .irq_set_type = tegra_gpio_irq_set_type, 611 #ifdef CONFIG_PM_SLEEP 612 .irq_set_wake = tegra_gpio_irq_set_wake, 613 #endif 614 .irq_print_chip = tegra_gpio_irq_print_chip, 615 .irq_request_resources = tegra_gpio_irq_request_resources, 616 .irq_release_resources = tegra_gpio_irq_release_resources, 617 .flags = IRQCHIP_IMMUTABLE, 618 }; 619 620 static const struct irq_chip tegra210_gpio_irq_chip = { 621 .irq_shutdown = tegra_gpio_irq_shutdown, 622 .irq_ack = tegra_gpio_irq_ack, 623 .irq_mask = tegra_gpio_irq_mask, 624 .irq_unmask = tegra_gpio_irq_unmask, 625 .irq_set_affinity = tegra_gpio_irq_set_affinity, 626 .irq_set_type = tegra_gpio_irq_set_type, 627 #ifdef CONFIG_PM_SLEEP 628 .irq_set_wake = tegra_gpio_irq_set_wake, 629 #endif 630 .irq_print_chip = tegra_gpio_irq_print_chip, 631 .irq_request_resources = tegra_gpio_irq_request_resources, 632 .irq_release_resources = tegra_gpio_irq_release_resources, 633 .flags = IRQCHIP_IMMUTABLE, 634 }; 635 636 #ifdef CONFIG_DEBUG_FS 637 638 #include <linux/debugfs.h> 639 640 static int tegra_dbg_gpio_show(struct seq_file *s, void *unused) 641 { 642 struct tegra_gpio_info *tgi = dev_get_drvdata(s->private); 643 unsigned int i, j; 644 645 for (i = 0; i < tgi->bank_count; i++) { 646 for (j = 0; j < 4; j++) { 647 unsigned int gpio = tegra_gpio_compose(i, j, 0); 648 649 seq_printf(s, 650 "%u:%u %02x %02x %02x %02x %02x %02x %06x\n", 651 i, j, 652 tegra_gpio_readl(tgi, GPIO_CNF(tgi, gpio)), 653 tegra_gpio_readl(tgi, GPIO_OE(tgi, gpio)), 654 tegra_gpio_readl(tgi, GPIO_OUT(tgi, gpio)), 655 tegra_gpio_readl(tgi, GPIO_IN(tgi, gpio)), 656 tegra_gpio_readl(tgi, GPIO_INT_STA(tgi, gpio)), 657 tegra_gpio_readl(tgi, GPIO_INT_ENB(tgi, gpio)), 658 tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio))); 659 } 660 } 661 return 0; 662 } 663 664 static void tegra_gpio_debuginit(struct tegra_gpio_info *tgi) 665 { 666 debugfs_create_devm_seqfile(tgi->dev, "tegra_gpio", NULL, 667 tegra_dbg_gpio_show); 668 } 669 670 #else 671 672 static inline void tegra_gpio_debuginit(struct tegra_gpio_info *tgi) 673 { 674 } 675 676 #endif 677 678 static const struct dev_pm_ops tegra_gpio_pm_ops = { 679 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(tegra_gpio_suspend, tegra_gpio_resume) 680 }; 681 682 static const struct of_device_id tegra_pmc_of_match[] = { 683 { .compatible = "nvidia,tegra210-pmc", }, 684 { /* sentinel */ }, 685 }; 686 687 static int tegra_gpio_probe(struct platform_device *pdev) 688 { 689 struct tegra_gpio_bank *bank; 690 struct tegra_gpio_info *tgi; 691 struct gpio_irq_chip *irq; 692 struct device_node *np; 693 unsigned int i, j; 694 int ret; 695 696 tgi = devm_kzalloc(&pdev->dev, sizeof(*tgi), GFP_KERNEL); 697 if (!tgi) 698 return -ENODEV; 699 700 tgi->soc = of_device_get_match_data(&pdev->dev); 701 tgi->dev = &pdev->dev; 702 703 ret = platform_irq_count(pdev); 704 if (ret < 0) 705 return ret; 706 707 tgi->bank_count = ret; 708 709 if (!tgi->bank_count) { 710 dev_err(&pdev->dev, "Missing IRQ resource\n"); 711 return -ENODEV; 712 } 713 714 tgi->gc.label = "tegra-gpio"; 715 tgi->gc.request = pinctrl_gpio_request; 716 tgi->gc.free = tegra_gpio_free; 717 tgi->gc.direction_input = tegra_gpio_direction_input; 718 tgi->gc.get = tegra_gpio_get; 719 tgi->gc.direction_output = tegra_gpio_direction_output; 720 tgi->gc.set = tegra_gpio_set; 721 tgi->gc.get_direction = tegra_gpio_get_direction; 722 tgi->gc.base = 0; 723 tgi->gc.ngpio = tgi->bank_count * 32; 724 tgi->gc.parent = &pdev->dev; 725 726 platform_set_drvdata(pdev, tgi); 727 728 if (tgi->soc->debounce_supported) 729 tgi->gc.set_config = tegra_gpio_set_config; 730 731 tgi->bank_info = devm_kcalloc(&pdev->dev, tgi->bank_count, 732 sizeof(*tgi->bank_info), GFP_KERNEL); 733 if (!tgi->bank_info) 734 return -ENOMEM; 735 736 tgi->irqs = devm_kcalloc(&pdev->dev, tgi->bank_count, 737 sizeof(*tgi->irqs), GFP_KERNEL); 738 if (!tgi->irqs) 739 return -ENOMEM; 740 741 for (i = 0; i < tgi->bank_count; i++) { 742 ret = platform_get_irq(pdev, i); 743 if (ret < 0) 744 return ret; 745 746 bank = &tgi->bank_info[i]; 747 bank->bank = i; 748 749 tgi->irqs[i] = ret; 750 751 for (j = 0; j < 4; j++) { 752 raw_spin_lock_init(&bank->lvl_lock[j]); 753 spin_lock_init(&bank->dbc_lock[j]); 754 } 755 } 756 757 irq = &tgi->gc.irq; 758 irq->fwnode = of_node_to_fwnode(pdev->dev.of_node); 759 irq->child_to_parent_hwirq = tegra_gpio_child_to_parent_hwirq; 760 irq->populate_parent_alloc_arg = tegra_gpio_populate_parent_fwspec; 761 irq->handler = handle_simple_irq; 762 irq->default_type = IRQ_TYPE_NONE; 763 irq->parent_handler = tegra_gpio_irq_handler; 764 irq->parent_handler_data = tgi; 765 irq->num_parents = tgi->bank_count; 766 irq->parents = tgi->irqs; 767 768 np = of_find_matching_node(NULL, tegra_pmc_of_match); 769 if (np) { 770 irq->parent_domain = irq_find_host(np); 771 of_node_put(np); 772 773 if (!irq->parent_domain) 774 return -EPROBE_DEFER; 775 776 gpio_irq_chip_set_chip(irq, &tegra210_gpio_irq_chip); 777 } else { 778 gpio_irq_chip_set_chip(irq, &tegra_gpio_irq_chip); 779 } 780 781 tgi->regs = devm_platform_ioremap_resource(pdev, 0); 782 if (IS_ERR(tgi->regs)) 783 return PTR_ERR(tgi->regs); 784 785 for (i = 0; i < tgi->bank_count; i++) { 786 for (j = 0; j < 4; j++) { 787 int gpio = tegra_gpio_compose(i, j, 0); 788 789 tegra_gpio_writel(tgi, 0x00, GPIO_INT_ENB(tgi, gpio)); 790 } 791 } 792 793 ret = devm_gpiochip_add_data(&pdev->dev, &tgi->gc, tgi); 794 if (ret < 0) 795 return ret; 796 797 tegra_gpio_debuginit(tgi); 798 799 return 0; 800 } 801 802 static const struct tegra_gpio_soc_config tegra20_gpio_config = { 803 .bank_stride = 0x80, 804 .upper_offset = 0x800, 805 }; 806 807 static const struct tegra_gpio_soc_config tegra30_gpio_config = { 808 .bank_stride = 0x100, 809 .upper_offset = 0x80, 810 }; 811 812 static const struct tegra_gpio_soc_config tegra210_gpio_config = { 813 .debounce_supported = true, 814 .bank_stride = 0x100, 815 .upper_offset = 0x80, 816 }; 817 818 static const struct of_device_id tegra_gpio_of_match[] = { 819 { .compatible = "nvidia,tegra210-gpio", .data = &tegra210_gpio_config }, 820 { .compatible = "nvidia,tegra30-gpio", .data = &tegra30_gpio_config }, 821 { .compatible = "nvidia,tegra20-gpio", .data = &tegra20_gpio_config }, 822 { }, 823 }; 824 MODULE_DEVICE_TABLE(of, tegra_gpio_of_match); 825 826 static struct platform_driver tegra_gpio_driver = { 827 .driver = { 828 .name = "tegra-gpio", 829 .pm = &tegra_gpio_pm_ops, 830 .of_match_table = tegra_gpio_of_match, 831 }, 832 .probe = tegra_gpio_probe, 833 }; 834 module_platform_driver(tegra_gpio_driver); 835 836 MODULE_DESCRIPTION("NVIDIA Tegra GPIO controller driver"); 837 MODULE_AUTHOR("Laxman Dewangan <ldewangan@nvidia.com>"); 838 MODULE_AUTHOR("Stephen Warren <swarren@nvidia.com>"); 839 MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>"); 840 MODULE_AUTHOR("Erik Gilling <konkers@google.com>"); 841 MODULE_LICENSE("GPL v2"); 842