1 /* 2 * arch/arm/mach-tegra/gpio.c 3 * 4 * Copyright (c) 2010 Google, Inc 5 * 6 * Author: 7 * Erik Gilling <konkers@google.com> 8 * 9 * This software is licensed under the terms of the GNU General Public 10 * License version 2, as published by the Free Software Foundation, and 11 * may be copied, distributed, and modified under those terms. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 */ 19 20 #include <linux/err.h> 21 #include <linux/init.h> 22 #include <linux/irq.h> 23 #include <linux/interrupt.h> 24 #include <linux/io.h> 25 #include <linux/gpio.h> 26 #include <linux/of_device.h> 27 #include <linux/platform_device.h> 28 #include <linux/module.h> 29 #include <linux/irqdomain.h> 30 #include <linux/irqchip/chained_irq.h> 31 #include <linux/pinctrl/consumer.h> 32 #include <linux/pm.h> 33 34 #define GPIO_BANK(x) ((x) >> 5) 35 #define GPIO_PORT(x) (((x) >> 3) & 0x3) 36 #define GPIO_BIT(x) ((x) & 0x7) 37 38 #define GPIO_REG(tgi, x) (GPIO_BANK(x) * tgi->soc->bank_stride + \ 39 GPIO_PORT(x) * 4) 40 41 #define GPIO_CNF(t, x) (GPIO_REG(t, x) + 0x00) 42 #define GPIO_OE(t, x) (GPIO_REG(t, x) + 0x10) 43 #define GPIO_OUT(t, x) (GPIO_REG(t, x) + 0X20) 44 #define GPIO_IN(t, x) (GPIO_REG(t, x) + 0x30) 45 #define GPIO_INT_STA(t, x) (GPIO_REG(t, x) + 0x40) 46 #define GPIO_INT_ENB(t, x) (GPIO_REG(t, x) + 0x50) 47 #define GPIO_INT_LVL(t, x) (GPIO_REG(t, x) + 0x60) 48 #define GPIO_INT_CLR(t, x) (GPIO_REG(t, x) + 0x70) 49 #define GPIO_DBC_CNT(t, x) (GPIO_REG(t, x) + 0xF0) 50 51 52 #define GPIO_MSK_CNF(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x00) 53 #define GPIO_MSK_OE(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x10) 54 #define GPIO_MSK_OUT(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0X20) 55 #define GPIO_MSK_DBC_EN(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x30) 56 #define GPIO_MSK_INT_STA(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x40) 57 #define GPIO_MSK_INT_ENB(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x50) 58 #define GPIO_MSK_INT_LVL(t, x) (GPIO_REG(t, x) + t->soc->upper_offset + 0x60) 59 60 #define GPIO_INT_LVL_MASK 0x010101 61 #define GPIO_INT_LVL_EDGE_RISING 0x000101 62 #define GPIO_INT_LVL_EDGE_FALLING 0x000100 63 #define GPIO_INT_LVL_EDGE_BOTH 0x010100 64 #define GPIO_INT_LVL_LEVEL_HIGH 0x000001 65 #define GPIO_INT_LVL_LEVEL_LOW 0x000000 66 67 struct tegra_gpio_info; 68 69 struct tegra_gpio_bank { 70 unsigned int bank; 71 unsigned int irq; 72 spinlock_t lvl_lock[4]; 73 spinlock_t dbc_lock[4]; /* Lock for updating debounce count register */ 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 struct tegra_gpio_info *tgi; 85 }; 86 87 struct tegra_gpio_soc_config { 88 bool debounce_supported; 89 u32 bank_stride; 90 u32 upper_offset; 91 }; 92 93 struct tegra_gpio_info { 94 struct device *dev; 95 void __iomem *regs; 96 struct irq_domain *irq_domain; 97 struct tegra_gpio_bank *bank_info; 98 const struct tegra_gpio_soc_config *soc; 99 struct gpio_chip gc; 100 struct irq_chip ic; 101 u32 bank_count; 102 }; 103 104 static inline void tegra_gpio_writel(struct tegra_gpio_info *tgi, 105 u32 val, u32 reg) 106 { 107 __raw_writel(val, tgi->regs + reg); 108 } 109 110 static inline u32 tegra_gpio_readl(struct tegra_gpio_info *tgi, u32 reg) 111 { 112 return __raw_readl(tgi->regs + reg); 113 } 114 115 static unsigned int tegra_gpio_compose(unsigned int bank, unsigned int port, 116 unsigned int bit) 117 { 118 return (bank << 5) | ((port & 0x3) << 3) | (bit & 0x7); 119 } 120 121 static void tegra_gpio_mask_write(struct tegra_gpio_info *tgi, u32 reg, 122 unsigned int gpio, u32 value) 123 { 124 u32 val; 125 126 val = 0x100 << GPIO_BIT(gpio); 127 if (value) 128 val |= 1 << GPIO_BIT(gpio); 129 tegra_gpio_writel(tgi, val, reg); 130 } 131 132 static void tegra_gpio_enable(struct tegra_gpio_info *tgi, unsigned int gpio) 133 { 134 tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 1); 135 } 136 137 static void tegra_gpio_disable(struct tegra_gpio_info *tgi, unsigned int gpio) 138 { 139 tegra_gpio_mask_write(tgi, GPIO_MSK_CNF(tgi, gpio), gpio, 0); 140 } 141 142 static int tegra_gpio_request(struct gpio_chip *chip, unsigned int offset) 143 { 144 return pinctrl_request_gpio(offset); 145 } 146 147 static void tegra_gpio_free(struct gpio_chip *chip, unsigned int offset) 148 { 149 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 150 151 pinctrl_free_gpio(offset); 152 tegra_gpio_disable(tgi, offset); 153 } 154 155 static void tegra_gpio_set(struct gpio_chip *chip, unsigned int offset, 156 int value) 157 { 158 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 159 160 tegra_gpio_mask_write(tgi, GPIO_MSK_OUT(tgi, offset), offset, value); 161 } 162 163 static int tegra_gpio_get(struct gpio_chip *chip, unsigned int offset) 164 { 165 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 166 unsigned int bval = BIT(GPIO_BIT(offset)); 167 168 /* If gpio is in output mode then read from the out value */ 169 if (tegra_gpio_readl(tgi, GPIO_OE(tgi, offset)) & bval) 170 return !!(tegra_gpio_readl(tgi, GPIO_OUT(tgi, offset)) & bval); 171 172 return !!(tegra_gpio_readl(tgi, GPIO_IN(tgi, offset)) & bval); 173 } 174 175 static int tegra_gpio_direction_input(struct gpio_chip *chip, 176 unsigned int offset) 177 { 178 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 179 180 tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, offset), offset, 0); 181 tegra_gpio_enable(tgi, offset); 182 return 0; 183 } 184 185 static int tegra_gpio_direction_output(struct gpio_chip *chip, 186 unsigned int offset, 187 int value) 188 { 189 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 190 191 tegra_gpio_set(chip, offset, value); 192 tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, offset), offset, 1); 193 tegra_gpio_enable(tgi, offset); 194 return 0; 195 } 196 197 static int tegra_gpio_get_direction(struct gpio_chip *chip, 198 unsigned int offset) 199 { 200 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 201 u32 pin_mask = BIT(GPIO_BIT(offset)); 202 u32 cnf, oe; 203 204 cnf = tegra_gpio_readl(tgi, GPIO_CNF(tgi, offset)); 205 if (!(cnf & pin_mask)) 206 return -EINVAL; 207 208 oe = tegra_gpio_readl(tgi, GPIO_OE(tgi, offset)); 209 210 return (oe & pin_mask) ? GPIOF_DIR_OUT : GPIOF_DIR_IN; 211 } 212 213 static int tegra_gpio_set_debounce(struct gpio_chip *chip, unsigned int offset, 214 unsigned int debounce) 215 { 216 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 217 struct tegra_gpio_bank *bank = &tgi->bank_info[GPIO_BANK(offset)]; 218 unsigned int debounce_ms = DIV_ROUND_UP(debounce, 1000); 219 unsigned long flags; 220 unsigned int port; 221 222 if (!debounce_ms) { 223 tegra_gpio_mask_write(tgi, GPIO_MSK_DBC_EN(tgi, offset), 224 offset, 0); 225 return 0; 226 } 227 228 debounce_ms = min(debounce_ms, 255U); 229 port = GPIO_PORT(offset); 230 231 /* There is only one debounce count register per port and hence 232 * set the maximum of current and requested debounce time. 233 */ 234 spin_lock_irqsave(&bank->dbc_lock[port], flags); 235 if (bank->dbc_cnt[port] < debounce_ms) { 236 tegra_gpio_writel(tgi, debounce_ms, GPIO_DBC_CNT(tgi, offset)); 237 bank->dbc_cnt[port] = debounce_ms; 238 } 239 spin_unlock_irqrestore(&bank->dbc_lock[port], flags); 240 241 tegra_gpio_mask_write(tgi, GPIO_MSK_DBC_EN(tgi, offset), offset, 1); 242 243 return 0; 244 } 245 246 static int tegra_gpio_set_config(struct gpio_chip *chip, unsigned int offset, 247 unsigned long config) 248 { 249 u32 debounce; 250 251 if (pinconf_to_config_param(config) != PIN_CONFIG_INPUT_DEBOUNCE) 252 return -ENOTSUPP; 253 254 debounce = pinconf_to_config_argument(config); 255 return tegra_gpio_set_debounce(chip, offset, debounce); 256 } 257 258 static int tegra_gpio_to_irq(struct gpio_chip *chip, unsigned int offset) 259 { 260 struct tegra_gpio_info *tgi = gpiochip_get_data(chip); 261 262 return irq_find_mapping(tgi->irq_domain, offset); 263 } 264 265 static void tegra_gpio_irq_ack(struct irq_data *d) 266 { 267 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d); 268 struct tegra_gpio_info *tgi = bank->tgi; 269 unsigned int gpio = d->hwirq; 270 271 tegra_gpio_writel(tgi, 1 << GPIO_BIT(gpio), GPIO_INT_CLR(tgi, gpio)); 272 } 273 274 static void tegra_gpio_irq_mask(struct irq_data *d) 275 { 276 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d); 277 struct tegra_gpio_info *tgi = bank->tgi; 278 unsigned int gpio = d->hwirq; 279 280 tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 0); 281 } 282 283 static void tegra_gpio_irq_unmask(struct irq_data *d) 284 { 285 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d); 286 struct tegra_gpio_info *tgi = bank->tgi; 287 unsigned int gpio = d->hwirq; 288 289 tegra_gpio_mask_write(tgi, GPIO_MSK_INT_ENB(tgi, gpio), gpio, 1); 290 } 291 292 static int tegra_gpio_irq_set_type(struct irq_data *d, unsigned int type) 293 { 294 unsigned int gpio = d->hwirq, port = GPIO_PORT(gpio), lvl_type; 295 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d); 296 struct tegra_gpio_info *tgi = bank->tgi; 297 unsigned long flags; 298 u32 val; 299 int ret; 300 301 switch (type & IRQ_TYPE_SENSE_MASK) { 302 case IRQ_TYPE_EDGE_RISING: 303 lvl_type = GPIO_INT_LVL_EDGE_RISING; 304 break; 305 306 case IRQ_TYPE_EDGE_FALLING: 307 lvl_type = GPIO_INT_LVL_EDGE_FALLING; 308 break; 309 310 case IRQ_TYPE_EDGE_BOTH: 311 lvl_type = GPIO_INT_LVL_EDGE_BOTH; 312 break; 313 314 case IRQ_TYPE_LEVEL_HIGH: 315 lvl_type = GPIO_INT_LVL_LEVEL_HIGH; 316 break; 317 318 case IRQ_TYPE_LEVEL_LOW: 319 lvl_type = GPIO_INT_LVL_LEVEL_LOW; 320 break; 321 322 default: 323 return -EINVAL; 324 } 325 326 ret = gpiochip_lock_as_irq(&tgi->gc, gpio); 327 if (ret) { 328 dev_err(tgi->dev, 329 "unable to lock Tegra GPIO %u as IRQ\n", gpio); 330 return ret; 331 } 332 333 spin_lock_irqsave(&bank->lvl_lock[port], flags); 334 335 val = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio)); 336 val &= ~(GPIO_INT_LVL_MASK << GPIO_BIT(gpio)); 337 val |= lvl_type << GPIO_BIT(gpio); 338 tegra_gpio_writel(tgi, val, GPIO_INT_LVL(tgi, gpio)); 339 340 spin_unlock_irqrestore(&bank->lvl_lock[port], flags); 341 342 tegra_gpio_mask_write(tgi, GPIO_MSK_OE(tgi, gpio), gpio, 0); 343 tegra_gpio_enable(tgi, gpio); 344 345 if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH)) 346 irq_set_handler_locked(d, handle_level_irq); 347 else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING)) 348 irq_set_handler_locked(d, handle_edge_irq); 349 350 return 0; 351 } 352 353 static void tegra_gpio_irq_shutdown(struct irq_data *d) 354 { 355 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d); 356 struct tegra_gpio_info *tgi = bank->tgi; 357 unsigned int gpio = d->hwirq; 358 359 gpiochip_unlock_as_irq(&tgi->gc, gpio); 360 } 361 362 static void tegra_gpio_irq_handler(struct irq_desc *desc) 363 { 364 unsigned int port, pin, gpio; 365 bool unmasked = false; 366 u32 lvl; 367 unsigned long sta; 368 struct irq_chip *chip = irq_desc_get_chip(desc); 369 struct tegra_gpio_bank *bank = irq_desc_get_handler_data(desc); 370 struct tegra_gpio_info *tgi = bank->tgi; 371 372 chained_irq_enter(chip, desc); 373 374 for (port = 0; port < 4; port++) { 375 gpio = tegra_gpio_compose(bank->bank, port, 0); 376 sta = tegra_gpio_readl(tgi, GPIO_INT_STA(tgi, gpio)) & 377 tegra_gpio_readl(tgi, GPIO_INT_ENB(tgi, gpio)); 378 lvl = tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio)); 379 380 for_each_set_bit(pin, &sta, 8) { 381 tegra_gpio_writel(tgi, 1 << pin, 382 GPIO_INT_CLR(tgi, gpio)); 383 384 /* if gpio is edge triggered, clear condition 385 * before executing the handler so that we don't 386 * miss edges 387 */ 388 if (!unmasked && lvl & (0x100 << pin)) { 389 unmasked = true; 390 chained_irq_exit(chip, desc); 391 } 392 393 generic_handle_irq(irq_find_mapping(tgi->irq_domain, 394 gpio + pin)); 395 } 396 } 397 398 if (!unmasked) 399 chained_irq_exit(chip, desc); 400 401 } 402 403 #ifdef CONFIG_PM_SLEEP 404 static int tegra_gpio_resume(struct device *dev) 405 { 406 struct platform_device *pdev = to_platform_device(dev); 407 struct tegra_gpio_info *tgi = platform_get_drvdata(pdev); 408 unsigned long flags; 409 unsigned int b, p; 410 411 local_irq_save(flags); 412 413 for (b = 0; b < tgi->bank_count; b++) { 414 struct tegra_gpio_bank *bank = &tgi->bank_info[b]; 415 416 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) { 417 unsigned int gpio = (b << 5) | (p << 3); 418 419 tegra_gpio_writel(tgi, bank->cnf[p], 420 GPIO_CNF(tgi, gpio)); 421 422 if (tgi->soc->debounce_supported) { 423 tegra_gpio_writel(tgi, bank->dbc_cnt[p], 424 GPIO_DBC_CNT(tgi, gpio)); 425 tegra_gpio_writel(tgi, bank->dbc_enb[p], 426 GPIO_MSK_DBC_EN(tgi, gpio)); 427 } 428 429 tegra_gpio_writel(tgi, bank->out[p], 430 GPIO_OUT(tgi, gpio)); 431 tegra_gpio_writel(tgi, bank->oe[p], 432 GPIO_OE(tgi, gpio)); 433 tegra_gpio_writel(tgi, bank->int_lvl[p], 434 GPIO_INT_LVL(tgi, gpio)); 435 tegra_gpio_writel(tgi, bank->int_enb[p], 436 GPIO_INT_ENB(tgi, gpio)); 437 } 438 } 439 440 local_irq_restore(flags); 441 return 0; 442 } 443 444 static int tegra_gpio_suspend(struct device *dev) 445 { 446 struct platform_device *pdev = to_platform_device(dev); 447 struct tegra_gpio_info *tgi = platform_get_drvdata(pdev); 448 unsigned long flags; 449 unsigned int b, p; 450 451 local_irq_save(flags); 452 for (b = 0; b < tgi->bank_count; b++) { 453 struct tegra_gpio_bank *bank = &tgi->bank_info[b]; 454 455 for (p = 0; p < ARRAY_SIZE(bank->oe); p++) { 456 unsigned int gpio = (b << 5) | (p << 3); 457 458 bank->cnf[p] = tegra_gpio_readl(tgi, 459 GPIO_CNF(tgi, gpio)); 460 bank->out[p] = tegra_gpio_readl(tgi, 461 GPIO_OUT(tgi, gpio)); 462 bank->oe[p] = tegra_gpio_readl(tgi, 463 GPIO_OE(tgi, gpio)); 464 if (tgi->soc->debounce_supported) { 465 bank->dbc_enb[p] = tegra_gpio_readl(tgi, 466 GPIO_MSK_DBC_EN(tgi, gpio)); 467 bank->dbc_enb[p] = (bank->dbc_enb[p] << 8) | 468 bank->dbc_enb[p]; 469 } 470 471 bank->int_enb[p] = tegra_gpio_readl(tgi, 472 GPIO_INT_ENB(tgi, gpio)); 473 bank->int_lvl[p] = tegra_gpio_readl(tgi, 474 GPIO_INT_LVL(tgi, gpio)); 475 476 /* Enable gpio irq for wake up source */ 477 tegra_gpio_writel(tgi, bank->wake_enb[p], 478 GPIO_INT_ENB(tgi, gpio)); 479 } 480 } 481 local_irq_restore(flags); 482 return 0; 483 } 484 485 static int tegra_gpio_irq_set_wake(struct irq_data *d, unsigned int enable) 486 { 487 struct tegra_gpio_bank *bank = irq_data_get_irq_chip_data(d); 488 unsigned int gpio = d->hwirq; 489 u32 port, bit, mask; 490 491 port = GPIO_PORT(gpio); 492 bit = GPIO_BIT(gpio); 493 mask = BIT(bit); 494 495 if (enable) 496 bank->wake_enb[port] |= mask; 497 else 498 bank->wake_enb[port] &= ~mask; 499 500 return irq_set_irq_wake(bank->irq, enable); 501 } 502 #endif 503 504 #ifdef CONFIG_DEBUG_FS 505 506 #include <linux/debugfs.h> 507 #include <linux/seq_file.h> 508 509 static int dbg_gpio_show(struct seq_file *s, void *unused) 510 { 511 struct tegra_gpio_info *tgi = s->private; 512 unsigned int i, j; 513 514 for (i = 0; i < tgi->bank_count; i++) { 515 for (j = 0; j < 4; j++) { 516 unsigned int gpio = tegra_gpio_compose(i, j, 0); 517 518 seq_printf(s, 519 "%u:%u %02x %02x %02x %02x %02x %02x %06x\n", 520 i, j, 521 tegra_gpio_readl(tgi, GPIO_CNF(tgi, gpio)), 522 tegra_gpio_readl(tgi, GPIO_OE(tgi, gpio)), 523 tegra_gpio_readl(tgi, GPIO_OUT(tgi, gpio)), 524 tegra_gpio_readl(tgi, GPIO_IN(tgi, gpio)), 525 tegra_gpio_readl(tgi, GPIO_INT_STA(tgi, gpio)), 526 tegra_gpio_readl(tgi, GPIO_INT_ENB(tgi, gpio)), 527 tegra_gpio_readl(tgi, GPIO_INT_LVL(tgi, gpio))); 528 } 529 } 530 return 0; 531 } 532 533 static int dbg_gpio_open(struct inode *inode, struct file *file) 534 { 535 return single_open(file, dbg_gpio_show, inode->i_private); 536 } 537 538 static const struct file_operations debug_fops = { 539 .open = dbg_gpio_open, 540 .read = seq_read, 541 .llseek = seq_lseek, 542 .release = single_release, 543 }; 544 545 static void tegra_gpio_debuginit(struct tegra_gpio_info *tgi) 546 { 547 (void) debugfs_create_file("tegra_gpio", 0444, 548 NULL, tgi, &debug_fops); 549 } 550 551 #else 552 553 static inline void tegra_gpio_debuginit(struct tegra_gpio_info *tgi) 554 { 555 } 556 557 #endif 558 559 static const struct dev_pm_ops tegra_gpio_pm_ops = { 560 SET_SYSTEM_SLEEP_PM_OPS(tegra_gpio_suspend, tegra_gpio_resume) 561 }; 562 563 /* 564 * This lock class tells lockdep that GPIO irqs are in a different category 565 * than their parents, so it won't report false recursion. 566 */ 567 static struct lock_class_key gpio_lock_class; 568 569 static int tegra_gpio_probe(struct platform_device *pdev) 570 { 571 struct tegra_gpio_info *tgi; 572 struct resource *res; 573 struct tegra_gpio_bank *bank; 574 unsigned int gpio, i, j; 575 int ret; 576 577 tgi = devm_kzalloc(&pdev->dev, sizeof(*tgi), GFP_KERNEL); 578 if (!tgi) 579 return -ENODEV; 580 581 tgi->soc = of_device_get_match_data(&pdev->dev); 582 tgi->dev = &pdev->dev; 583 584 ret = platform_irq_count(pdev); 585 if (ret < 0) 586 return ret; 587 588 tgi->bank_count = ret; 589 590 if (!tgi->bank_count) { 591 dev_err(&pdev->dev, "Missing IRQ resource\n"); 592 return -ENODEV; 593 } 594 595 tgi->gc.label = "tegra-gpio"; 596 tgi->gc.request = tegra_gpio_request; 597 tgi->gc.free = tegra_gpio_free; 598 tgi->gc.direction_input = tegra_gpio_direction_input; 599 tgi->gc.get = tegra_gpio_get; 600 tgi->gc.direction_output = tegra_gpio_direction_output; 601 tgi->gc.set = tegra_gpio_set; 602 tgi->gc.get_direction = tegra_gpio_get_direction; 603 tgi->gc.to_irq = tegra_gpio_to_irq; 604 tgi->gc.base = 0; 605 tgi->gc.ngpio = tgi->bank_count * 32; 606 tgi->gc.parent = &pdev->dev; 607 tgi->gc.of_node = pdev->dev.of_node; 608 609 tgi->ic.name = "GPIO"; 610 tgi->ic.irq_ack = tegra_gpio_irq_ack; 611 tgi->ic.irq_mask = tegra_gpio_irq_mask; 612 tgi->ic.irq_unmask = tegra_gpio_irq_unmask; 613 tgi->ic.irq_set_type = tegra_gpio_irq_set_type; 614 tgi->ic.irq_shutdown = tegra_gpio_irq_shutdown; 615 #ifdef CONFIG_PM_SLEEP 616 tgi->ic.irq_set_wake = tegra_gpio_irq_set_wake; 617 #endif 618 619 platform_set_drvdata(pdev, tgi); 620 621 if (tgi->soc->debounce_supported) 622 tgi->gc.set_config = tegra_gpio_set_config; 623 624 tgi->bank_info = devm_kcalloc(&pdev->dev, tgi->bank_count, 625 sizeof(*tgi->bank_info), GFP_KERNEL); 626 if (!tgi->bank_info) 627 return -ENOMEM; 628 629 tgi->irq_domain = irq_domain_add_linear(pdev->dev.of_node, 630 tgi->gc.ngpio, 631 &irq_domain_simple_ops, NULL); 632 if (!tgi->irq_domain) 633 return -ENODEV; 634 635 for (i = 0; i < tgi->bank_count; i++) { 636 ret = platform_get_irq(pdev, i); 637 if (ret < 0) { 638 dev_err(&pdev->dev, "Missing IRQ resource: %d\n", ret); 639 return ret; 640 } 641 642 bank = &tgi->bank_info[i]; 643 bank->bank = i; 644 bank->irq = ret; 645 bank->tgi = tgi; 646 } 647 648 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 649 tgi->regs = devm_ioremap_resource(&pdev->dev, res); 650 if (IS_ERR(tgi->regs)) 651 return PTR_ERR(tgi->regs); 652 653 for (i = 0; i < tgi->bank_count; i++) { 654 for (j = 0; j < 4; j++) { 655 int gpio = tegra_gpio_compose(i, j, 0); 656 657 tegra_gpio_writel(tgi, 0x00, GPIO_INT_ENB(tgi, gpio)); 658 } 659 } 660 661 ret = devm_gpiochip_add_data(&pdev->dev, &tgi->gc, tgi); 662 if (ret < 0) { 663 irq_domain_remove(tgi->irq_domain); 664 return ret; 665 } 666 667 for (gpio = 0; gpio < tgi->gc.ngpio; gpio++) { 668 int irq = irq_create_mapping(tgi->irq_domain, gpio); 669 /* No validity check; all Tegra GPIOs are valid IRQs */ 670 671 bank = &tgi->bank_info[GPIO_BANK(gpio)]; 672 673 irq_set_lockdep_class(irq, &gpio_lock_class); 674 irq_set_chip_data(irq, bank); 675 irq_set_chip_and_handler(irq, &tgi->ic, handle_simple_irq); 676 } 677 678 for (i = 0; i < tgi->bank_count; i++) { 679 bank = &tgi->bank_info[i]; 680 681 irq_set_chained_handler_and_data(bank->irq, 682 tegra_gpio_irq_handler, bank); 683 684 for (j = 0; j < 4; j++) { 685 spin_lock_init(&bank->lvl_lock[j]); 686 spin_lock_init(&bank->dbc_lock[j]); 687 } 688 } 689 690 tegra_gpio_debuginit(tgi); 691 692 return 0; 693 } 694 695 static const struct tegra_gpio_soc_config tegra20_gpio_config = { 696 .bank_stride = 0x80, 697 .upper_offset = 0x800, 698 }; 699 700 static const struct tegra_gpio_soc_config tegra30_gpio_config = { 701 .bank_stride = 0x100, 702 .upper_offset = 0x80, 703 }; 704 705 static const struct tegra_gpio_soc_config tegra210_gpio_config = { 706 .debounce_supported = true, 707 .bank_stride = 0x100, 708 .upper_offset = 0x80, 709 }; 710 711 static const struct of_device_id tegra_gpio_of_match[] = { 712 { .compatible = "nvidia,tegra210-gpio", .data = &tegra210_gpio_config }, 713 { .compatible = "nvidia,tegra30-gpio", .data = &tegra30_gpio_config }, 714 { .compatible = "nvidia,tegra20-gpio", .data = &tegra20_gpio_config }, 715 { }, 716 }; 717 718 static struct platform_driver tegra_gpio_driver = { 719 .driver = { 720 .name = "tegra-gpio", 721 .pm = &tegra_gpio_pm_ops, 722 .of_match_table = tegra_gpio_of_match, 723 }, 724 .probe = tegra_gpio_probe, 725 }; 726 727 static int __init tegra_gpio_init(void) 728 { 729 return platform_driver_register(&tegra_gpio_driver); 730 } 731 postcore_initcall(tegra_gpio_init); 732