1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2014-2017 Broadcom 4 */ 5 6 /* 7 * This file contains the Broadcom Iproc GPIO driver that supports 3 8 * GPIO controllers on Iproc including the ASIU GPIO controller, the 9 * chipCommonG GPIO controller, and the always-on GPIO controller. Basic 10 * PINCONF such as bias pull up/down, and drive strength are also supported 11 * in this driver. 12 * 13 * It provides the functionality where pins from the GPIO can be 14 * individually muxed to GPIO function, if individual pad 15 * configuration is supported, through the interaction with respective 16 * SoCs IOMUX controller. 17 */ 18 19 #include <linux/gpio/driver.h> 20 #include <linux/interrupt.h> 21 #include <linux/io.h> 22 #include <linux/ioport.h> 23 #include <linux/kernel.h> 24 #include <linux/of.h> 25 #include <linux/platform_device.h> 26 #include <linux/seq_file.h> 27 #include <linux/slab.h> 28 29 #include <linux/pinctrl/consumer.h> 30 #include <linux/pinctrl/pinconf-generic.h> 31 #include <linux/pinctrl/pinconf.h> 32 #include <linux/pinctrl/pinctrl.h> 33 34 #include "../pinctrl-utils.h" 35 36 #define IPROC_GPIO_DATA_IN_OFFSET 0x00 37 #define IPROC_GPIO_DATA_OUT_OFFSET 0x04 38 #define IPROC_GPIO_OUT_EN_OFFSET 0x08 39 #define IPROC_GPIO_INT_TYPE_OFFSET 0x0c 40 #define IPROC_GPIO_INT_DE_OFFSET 0x10 41 #define IPROC_GPIO_INT_EDGE_OFFSET 0x14 42 #define IPROC_GPIO_INT_MSK_OFFSET 0x18 43 #define IPROC_GPIO_INT_STAT_OFFSET 0x1c 44 #define IPROC_GPIO_INT_MSTAT_OFFSET 0x20 45 #define IPROC_GPIO_INT_CLR_OFFSET 0x24 46 #define IPROC_GPIO_PAD_RES_OFFSET 0x34 47 #define IPROC_GPIO_RES_EN_OFFSET 0x38 48 49 /* drive strength control for ASIU GPIO */ 50 #define IPROC_GPIO_ASIU_DRV0_CTRL_OFFSET 0x58 51 52 /* pinconf for CCM GPIO */ 53 #define IPROC_GPIO_PULL_DN_OFFSET 0x10 54 #define IPROC_GPIO_PULL_UP_OFFSET 0x14 55 56 /* pinconf for CRMU(aon) GPIO and CCM GPIO*/ 57 #define IPROC_GPIO_DRV_CTRL_OFFSET 0x00 58 59 #define GPIO_BANK_SIZE 0x200 60 #define NGPIOS_PER_BANK 32 61 #define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK) 62 63 #define IPROC_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg)) 64 #define IPROC_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK) 65 66 #define GPIO_DRV_STRENGTH_BIT_SHIFT 20 67 #define GPIO_DRV_STRENGTH_BITS 3 68 #define GPIO_DRV_STRENGTH_BIT_MASK ((1 << GPIO_DRV_STRENGTH_BITS) - 1) 69 70 enum iproc_pinconf_param { 71 IPROC_PINCONF_DRIVE_STRENGTH = 0, 72 IPROC_PINCONF_BIAS_DISABLE, 73 IPROC_PINCONF_BIAS_PULL_UP, 74 IPROC_PINCONF_BIAS_PULL_DOWN, 75 IPROC_PINCON_MAX, 76 }; 77 78 enum iproc_pinconf_ctrl_type { 79 IOCTRL_TYPE_AON = 1, 80 IOCTRL_TYPE_CDRU, 81 IOCTRL_TYPE_INVALID, 82 }; 83 84 /* 85 * Iproc GPIO core 86 * 87 * @dev: pointer to device 88 * @base: I/O register base for Iproc GPIO controller 89 * @io_ctrl: I/O register base for certain type of Iproc GPIO controller that 90 * has the PINCONF support implemented outside of the GPIO block 91 * @lock: lock to protect access to I/O registers 92 * @gc: GPIO chip 93 * @num_banks: number of GPIO banks, each bank supports up to 32 GPIOs 94 * @pinmux_is_supported: flag to indicate this GPIO controller contains pins 95 * that can be individually muxed to GPIO 96 * @pinconf_disable: contains a list of PINCONF parameters that need to be 97 * disabled 98 * @nr_pinconf_disable: total number of PINCONF parameters that need to be 99 * disabled 100 * @pctl: pointer to pinctrl_dev 101 * @pctldesc: pinctrl descriptor 102 */ 103 struct iproc_gpio { 104 struct device *dev; 105 106 void __iomem *base; 107 void __iomem *io_ctrl; 108 enum iproc_pinconf_ctrl_type io_ctrl_type; 109 110 raw_spinlock_t lock; 111 112 struct gpio_chip gc; 113 unsigned num_banks; 114 115 bool pinmux_is_supported; 116 117 enum pin_config_param *pinconf_disable; 118 unsigned int nr_pinconf_disable; 119 120 struct pinctrl_dev *pctl; 121 struct pinctrl_desc pctldesc; 122 }; 123 124 /* 125 * Mapping from PINCONF pins to GPIO pins is 1-to-1 126 */ 127 static inline unsigned iproc_pin_to_gpio(unsigned pin) 128 { 129 return pin; 130 } 131 132 /** 133 * iproc_set_bit - set or clear one bit (corresponding to the GPIO pin) in a 134 * Iproc GPIO register 135 * 136 * @chip: Iproc GPIO device 137 * @reg: register offset 138 * @gpio: GPIO pin 139 * @set: set or clear 140 */ 141 static inline void iproc_set_bit(struct iproc_gpio *chip, unsigned int reg, 142 unsigned gpio, bool set) 143 { 144 unsigned int offset = IPROC_GPIO_REG(gpio, reg); 145 unsigned int shift = IPROC_GPIO_SHIFT(gpio); 146 u32 val; 147 148 val = readl(chip->base + offset); 149 if (set) 150 val |= BIT(shift); 151 else 152 val &= ~BIT(shift); 153 writel(val, chip->base + offset); 154 } 155 156 static inline bool iproc_get_bit(struct iproc_gpio *chip, unsigned int reg, 157 unsigned gpio) 158 { 159 unsigned int offset = IPROC_GPIO_REG(gpio, reg); 160 unsigned int shift = IPROC_GPIO_SHIFT(gpio); 161 162 return !!(readl(chip->base + offset) & BIT(shift)); 163 } 164 165 static void iproc_gpio_irq_handler(struct irq_desc *desc) 166 { 167 struct gpio_chip *gc = irq_desc_get_handler_data(desc); 168 struct iproc_gpio *chip = gpiochip_get_data(gc); 169 struct irq_chip *irq_chip = irq_desc_get_chip(desc); 170 int i, bit; 171 172 chained_irq_enter(irq_chip, desc); 173 174 /* go through the entire GPIO banks and handle all interrupts */ 175 for (i = 0; i < chip->num_banks; i++) { 176 unsigned long val = readl(chip->base + (i * GPIO_BANK_SIZE) + 177 IPROC_GPIO_INT_MSTAT_OFFSET); 178 179 for_each_set_bit(bit, &val, NGPIOS_PER_BANK) { 180 unsigned pin = NGPIOS_PER_BANK * i + bit; 181 182 /* 183 * Clear the interrupt before invoking the 184 * handler, so we do not leave any window 185 */ 186 writel(BIT(bit), chip->base + (i * GPIO_BANK_SIZE) + 187 IPROC_GPIO_INT_CLR_OFFSET); 188 189 generic_handle_domain_irq(gc->irq.domain, pin); 190 } 191 } 192 193 chained_irq_exit(irq_chip, desc); 194 } 195 196 197 static void iproc_gpio_irq_ack(struct irq_data *d) 198 { 199 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 200 struct iproc_gpio *chip = gpiochip_get_data(gc); 201 unsigned gpio = d->hwirq; 202 unsigned int offset = IPROC_GPIO_REG(gpio, 203 IPROC_GPIO_INT_CLR_OFFSET); 204 unsigned int shift = IPROC_GPIO_SHIFT(gpio); 205 u32 val = BIT(shift); 206 207 writel(val, chip->base + offset); 208 } 209 210 /** 211 * iproc_gpio_irq_set_mask - mask/unmask a GPIO interrupt 212 * 213 * @d: IRQ chip data 214 * @unmask: mask/unmask GPIO interrupt 215 */ 216 static void iproc_gpio_irq_set_mask(struct irq_data *d, bool unmask) 217 { 218 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 219 struct iproc_gpio *chip = gpiochip_get_data(gc); 220 unsigned gpio = irqd_to_hwirq(d); 221 222 iproc_set_bit(chip, IPROC_GPIO_INT_MSK_OFFSET, gpio, unmask); 223 } 224 225 static void iproc_gpio_irq_mask(struct irq_data *d) 226 { 227 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 228 struct iproc_gpio *chip = gpiochip_get_data(gc); 229 unsigned long flags; 230 231 raw_spin_lock_irqsave(&chip->lock, flags); 232 iproc_gpio_irq_set_mask(d, false); 233 raw_spin_unlock_irqrestore(&chip->lock, flags); 234 gpiochip_disable_irq(gc, irqd_to_hwirq(d)); 235 } 236 237 static void iproc_gpio_irq_unmask(struct irq_data *d) 238 { 239 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 240 struct iproc_gpio *chip = gpiochip_get_data(gc); 241 unsigned long flags; 242 243 gpiochip_enable_irq(gc, irqd_to_hwirq(d)); 244 raw_spin_lock_irqsave(&chip->lock, flags); 245 iproc_gpio_irq_set_mask(d, true); 246 raw_spin_unlock_irqrestore(&chip->lock, flags); 247 } 248 249 static int iproc_gpio_irq_set_type(struct irq_data *d, unsigned int type) 250 { 251 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 252 struct iproc_gpio *chip = gpiochip_get_data(gc); 253 unsigned gpio = d->hwirq; 254 bool level_triggered = false; 255 bool dual_edge = false; 256 bool rising_or_high = false; 257 unsigned long flags; 258 259 switch (type & IRQ_TYPE_SENSE_MASK) { 260 case IRQ_TYPE_EDGE_RISING: 261 rising_or_high = true; 262 break; 263 264 case IRQ_TYPE_EDGE_FALLING: 265 break; 266 267 case IRQ_TYPE_EDGE_BOTH: 268 dual_edge = true; 269 break; 270 271 case IRQ_TYPE_LEVEL_HIGH: 272 level_triggered = true; 273 rising_or_high = true; 274 break; 275 276 case IRQ_TYPE_LEVEL_LOW: 277 level_triggered = true; 278 break; 279 280 default: 281 dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n", 282 type); 283 return -EINVAL; 284 } 285 286 raw_spin_lock_irqsave(&chip->lock, flags); 287 iproc_set_bit(chip, IPROC_GPIO_INT_TYPE_OFFSET, gpio, 288 level_triggered); 289 iproc_set_bit(chip, IPROC_GPIO_INT_DE_OFFSET, gpio, dual_edge); 290 iproc_set_bit(chip, IPROC_GPIO_INT_EDGE_OFFSET, gpio, 291 rising_or_high); 292 293 if (type & IRQ_TYPE_EDGE_BOTH) 294 irq_set_handler_locked(d, handle_edge_irq); 295 else 296 irq_set_handler_locked(d, handle_level_irq); 297 298 raw_spin_unlock_irqrestore(&chip->lock, flags); 299 300 dev_dbg(chip->dev, 301 "gpio:%u level_triggered:%d dual_edge:%d rising_or_high:%d\n", 302 gpio, level_triggered, dual_edge, rising_or_high); 303 304 return 0; 305 } 306 307 static void iproc_gpio_irq_print_chip(struct irq_data *d, struct seq_file *p) 308 { 309 struct gpio_chip *gc = irq_data_get_irq_chip_data(d); 310 struct iproc_gpio *chip = gpiochip_get_data(gc); 311 312 seq_printf(p, dev_name(chip->dev)); 313 } 314 315 static const struct irq_chip iproc_gpio_irq_chip = { 316 .irq_ack = iproc_gpio_irq_ack, 317 .irq_mask = iproc_gpio_irq_mask, 318 .irq_unmask = iproc_gpio_irq_unmask, 319 .irq_set_type = iproc_gpio_irq_set_type, 320 .irq_enable = iproc_gpio_irq_unmask, 321 .irq_disable = iproc_gpio_irq_mask, 322 .irq_print_chip = iproc_gpio_irq_print_chip, 323 .flags = IRQCHIP_IMMUTABLE, 324 GPIOCHIP_IRQ_RESOURCE_HELPERS, 325 }; 326 327 /* 328 * Request the Iproc IOMUX pinmux controller to mux individual pins to GPIO 329 */ 330 static int iproc_gpio_request(struct gpio_chip *gc, unsigned offset) 331 { 332 struct iproc_gpio *chip = gpiochip_get_data(gc); 333 334 /* not all Iproc GPIO pins can be muxed individually */ 335 if (!chip->pinmux_is_supported) 336 return 0; 337 338 return pinctrl_gpio_request(gc, offset); 339 } 340 341 static void iproc_gpio_free(struct gpio_chip *gc, unsigned offset) 342 { 343 struct iproc_gpio *chip = gpiochip_get_data(gc); 344 345 if (!chip->pinmux_is_supported) 346 return; 347 348 pinctrl_gpio_free(gc, offset); 349 } 350 351 static int iproc_gpio_direction_input(struct gpio_chip *gc, unsigned gpio) 352 { 353 struct iproc_gpio *chip = gpiochip_get_data(gc); 354 unsigned long flags; 355 356 raw_spin_lock_irqsave(&chip->lock, flags); 357 iproc_set_bit(chip, IPROC_GPIO_OUT_EN_OFFSET, gpio, false); 358 raw_spin_unlock_irqrestore(&chip->lock, flags); 359 360 dev_dbg(chip->dev, "gpio:%u set input\n", gpio); 361 362 return 0; 363 } 364 365 static int iproc_gpio_direction_output(struct gpio_chip *gc, unsigned gpio, 366 int val) 367 { 368 struct iproc_gpio *chip = gpiochip_get_data(gc); 369 unsigned long flags; 370 371 raw_spin_lock_irqsave(&chip->lock, flags); 372 iproc_set_bit(chip, IPROC_GPIO_OUT_EN_OFFSET, gpio, true); 373 iproc_set_bit(chip, IPROC_GPIO_DATA_OUT_OFFSET, gpio, !!(val)); 374 raw_spin_unlock_irqrestore(&chip->lock, flags); 375 376 dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, val); 377 378 return 0; 379 } 380 381 static int iproc_gpio_get_direction(struct gpio_chip *gc, unsigned int gpio) 382 { 383 struct iproc_gpio *chip = gpiochip_get_data(gc); 384 unsigned int offset = IPROC_GPIO_REG(gpio, IPROC_GPIO_OUT_EN_OFFSET); 385 unsigned int shift = IPROC_GPIO_SHIFT(gpio); 386 387 if (readl(chip->base + offset) & BIT(shift)) 388 return GPIO_LINE_DIRECTION_OUT; 389 390 return GPIO_LINE_DIRECTION_IN; 391 } 392 393 static void iproc_gpio_set(struct gpio_chip *gc, unsigned gpio, int val) 394 { 395 struct iproc_gpio *chip = gpiochip_get_data(gc); 396 unsigned long flags; 397 398 raw_spin_lock_irqsave(&chip->lock, flags); 399 iproc_set_bit(chip, IPROC_GPIO_DATA_OUT_OFFSET, gpio, !!(val)); 400 raw_spin_unlock_irqrestore(&chip->lock, flags); 401 402 dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, val); 403 } 404 405 static int iproc_gpio_get(struct gpio_chip *gc, unsigned gpio) 406 { 407 struct iproc_gpio *chip = gpiochip_get_data(gc); 408 unsigned int offset = IPROC_GPIO_REG(gpio, 409 IPROC_GPIO_DATA_IN_OFFSET); 410 unsigned int shift = IPROC_GPIO_SHIFT(gpio); 411 412 return !!(readl(chip->base + offset) & BIT(shift)); 413 } 414 415 /* 416 * Mapping of the iProc PINCONF parameters to the generic pin configuration 417 * parameters 418 */ 419 static const enum pin_config_param iproc_pinconf_disable_map[] = { 420 [IPROC_PINCONF_DRIVE_STRENGTH] = PIN_CONFIG_DRIVE_STRENGTH, 421 [IPROC_PINCONF_BIAS_DISABLE] = PIN_CONFIG_BIAS_DISABLE, 422 [IPROC_PINCONF_BIAS_PULL_UP] = PIN_CONFIG_BIAS_PULL_UP, 423 [IPROC_PINCONF_BIAS_PULL_DOWN] = PIN_CONFIG_BIAS_PULL_DOWN, 424 }; 425 426 static bool iproc_pinconf_param_is_disabled(struct iproc_gpio *chip, 427 enum pin_config_param param) 428 { 429 unsigned int i; 430 431 if (!chip->nr_pinconf_disable) 432 return false; 433 434 for (i = 0; i < chip->nr_pinconf_disable; i++) 435 if (chip->pinconf_disable[i] == param) 436 return true; 437 438 return false; 439 } 440 441 static int iproc_pinconf_disable_map_create(struct iproc_gpio *chip, 442 unsigned long disable_mask) 443 { 444 unsigned int map_size = ARRAY_SIZE(iproc_pinconf_disable_map); 445 unsigned int bit, nbits = 0; 446 447 /* figure out total number of PINCONF parameters to disable */ 448 for_each_set_bit(bit, &disable_mask, map_size) 449 nbits++; 450 451 if (!nbits) 452 return 0; 453 454 /* 455 * Allocate an array to store PINCONF parameters that need to be 456 * disabled 457 */ 458 chip->pinconf_disable = devm_kcalloc(chip->dev, nbits, 459 sizeof(*chip->pinconf_disable), 460 GFP_KERNEL); 461 if (!chip->pinconf_disable) 462 return -ENOMEM; 463 464 chip->nr_pinconf_disable = nbits; 465 466 /* now store these parameters */ 467 nbits = 0; 468 for_each_set_bit(bit, &disable_mask, map_size) 469 chip->pinconf_disable[nbits++] = iproc_pinconf_disable_map[bit]; 470 471 return 0; 472 } 473 474 static int iproc_get_groups_count(struct pinctrl_dev *pctldev) 475 { 476 return 1; 477 } 478 479 /* 480 * Only one group: "gpio_grp", since this local pinctrl device only performs 481 * GPIO specific PINCONF configurations 482 */ 483 static const char *iproc_get_group_name(struct pinctrl_dev *pctldev, 484 unsigned selector) 485 { 486 return "gpio_grp"; 487 } 488 489 static const struct pinctrl_ops iproc_pctrl_ops = { 490 .get_groups_count = iproc_get_groups_count, 491 .get_group_name = iproc_get_group_name, 492 .dt_node_to_map = pinconf_generic_dt_node_to_map_pin, 493 .dt_free_map = pinctrl_utils_free_map, 494 }; 495 496 static int iproc_gpio_set_pull(struct iproc_gpio *chip, unsigned gpio, 497 bool disable, bool pull_up) 498 { 499 void __iomem *base; 500 unsigned long flags; 501 unsigned int shift; 502 u32 val_1, val_2; 503 504 raw_spin_lock_irqsave(&chip->lock, flags); 505 if (chip->io_ctrl_type == IOCTRL_TYPE_CDRU) { 506 base = chip->io_ctrl; 507 shift = IPROC_GPIO_SHIFT(gpio); 508 509 val_1 = readl(base + IPROC_GPIO_PULL_UP_OFFSET); 510 val_2 = readl(base + IPROC_GPIO_PULL_DN_OFFSET); 511 if (disable) { 512 /* no pull-up or pull-down */ 513 val_1 &= ~BIT(shift); 514 val_2 &= ~BIT(shift); 515 } else if (pull_up) { 516 val_1 |= BIT(shift); 517 val_2 &= ~BIT(shift); 518 } else { 519 val_1 &= ~BIT(shift); 520 val_2 |= BIT(shift); 521 } 522 writel(val_1, base + IPROC_GPIO_PULL_UP_OFFSET); 523 writel(val_2, base + IPROC_GPIO_PULL_DN_OFFSET); 524 } else { 525 if (disable) { 526 iproc_set_bit(chip, IPROC_GPIO_RES_EN_OFFSET, gpio, 527 false); 528 } else { 529 iproc_set_bit(chip, IPROC_GPIO_PAD_RES_OFFSET, gpio, 530 pull_up); 531 iproc_set_bit(chip, IPROC_GPIO_RES_EN_OFFSET, gpio, 532 true); 533 } 534 } 535 536 raw_spin_unlock_irqrestore(&chip->lock, flags); 537 dev_dbg(chip->dev, "gpio:%u set pullup:%d\n", gpio, pull_up); 538 539 return 0; 540 } 541 542 static void iproc_gpio_get_pull(struct iproc_gpio *chip, unsigned gpio, 543 bool *disable, bool *pull_up) 544 { 545 void __iomem *base; 546 unsigned long flags; 547 unsigned int shift; 548 u32 val_1, val_2; 549 550 raw_spin_lock_irqsave(&chip->lock, flags); 551 if (chip->io_ctrl_type == IOCTRL_TYPE_CDRU) { 552 base = chip->io_ctrl; 553 shift = IPROC_GPIO_SHIFT(gpio); 554 555 val_1 = readl(base + IPROC_GPIO_PULL_UP_OFFSET) & BIT(shift); 556 val_2 = readl(base + IPROC_GPIO_PULL_DN_OFFSET) & BIT(shift); 557 558 *pull_up = val_1 ? true : false; 559 *disable = (val_1 | val_2) ? false : true; 560 561 } else { 562 *disable = !iproc_get_bit(chip, IPROC_GPIO_RES_EN_OFFSET, gpio); 563 *pull_up = iproc_get_bit(chip, IPROC_GPIO_PAD_RES_OFFSET, gpio); 564 } 565 raw_spin_unlock_irqrestore(&chip->lock, flags); 566 } 567 568 #define DRV_STRENGTH_OFFSET(gpio, bit, type) ((type) == IOCTRL_TYPE_AON ? \ 569 ((2 - (bit)) * 4 + IPROC_GPIO_DRV_CTRL_OFFSET) : \ 570 ((type) == IOCTRL_TYPE_CDRU) ? \ 571 ((bit) * 4 + IPROC_GPIO_DRV_CTRL_OFFSET) : \ 572 ((bit) * 4 + IPROC_GPIO_REG(gpio, IPROC_GPIO_ASIU_DRV0_CTRL_OFFSET))) 573 574 static int iproc_gpio_set_strength(struct iproc_gpio *chip, unsigned gpio, 575 unsigned strength) 576 { 577 void __iomem *base; 578 unsigned int i, offset, shift; 579 u32 val; 580 unsigned long flags; 581 582 /* make sure drive strength is supported */ 583 if (strength < 2 || strength > 16 || (strength % 2)) 584 return -ENOTSUPP; 585 586 if (chip->io_ctrl) { 587 base = chip->io_ctrl; 588 } else { 589 base = chip->base; 590 } 591 592 shift = IPROC_GPIO_SHIFT(gpio); 593 594 dev_dbg(chip->dev, "gpio:%u set drive strength:%d mA\n", gpio, 595 strength); 596 597 raw_spin_lock_irqsave(&chip->lock, flags); 598 strength = (strength / 2) - 1; 599 for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) { 600 offset = DRV_STRENGTH_OFFSET(gpio, i, chip->io_ctrl_type); 601 val = readl(base + offset); 602 val &= ~BIT(shift); 603 val |= ((strength >> i) & 0x1) << shift; 604 writel(val, base + offset); 605 } 606 raw_spin_unlock_irqrestore(&chip->lock, flags); 607 608 return 0; 609 } 610 611 static int iproc_gpio_get_strength(struct iproc_gpio *chip, unsigned gpio, 612 u16 *strength) 613 { 614 void __iomem *base; 615 unsigned int i, offset, shift; 616 u32 val; 617 unsigned long flags; 618 619 if (chip->io_ctrl) { 620 base = chip->io_ctrl; 621 } else { 622 base = chip->base; 623 } 624 625 shift = IPROC_GPIO_SHIFT(gpio); 626 627 raw_spin_lock_irqsave(&chip->lock, flags); 628 *strength = 0; 629 for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) { 630 offset = DRV_STRENGTH_OFFSET(gpio, i, chip->io_ctrl_type); 631 val = readl(base + offset) & BIT(shift); 632 val >>= shift; 633 *strength += (val << i); 634 } 635 636 /* convert to mA */ 637 *strength = (*strength + 1) * 2; 638 raw_spin_unlock_irqrestore(&chip->lock, flags); 639 640 return 0; 641 } 642 643 static int iproc_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin, 644 unsigned long *config) 645 { 646 struct iproc_gpio *chip = pinctrl_dev_get_drvdata(pctldev); 647 enum pin_config_param param = pinconf_to_config_param(*config); 648 unsigned gpio = iproc_pin_to_gpio(pin); 649 u16 arg; 650 bool disable, pull_up; 651 int ret; 652 653 if (iproc_pinconf_param_is_disabled(chip, param)) 654 return -ENOTSUPP; 655 656 switch (param) { 657 case PIN_CONFIG_BIAS_DISABLE: 658 iproc_gpio_get_pull(chip, gpio, &disable, &pull_up); 659 if (disable) 660 return 0; 661 else 662 return -EINVAL; 663 664 case PIN_CONFIG_BIAS_PULL_UP: 665 iproc_gpio_get_pull(chip, gpio, &disable, &pull_up); 666 if (!disable && pull_up) 667 return 0; 668 else 669 return -EINVAL; 670 671 case PIN_CONFIG_BIAS_PULL_DOWN: 672 iproc_gpio_get_pull(chip, gpio, &disable, &pull_up); 673 if (!disable && !pull_up) 674 return 0; 675 else 676 return -EINVAL; 677 678 case PIN_CONFIG_DRIVE_STRENGTH: 679 ret = iproc_gpio_get_strength(chip, gpio, &arg); 680 if (ret) 681 return ret; 682 *config = pinconf_to_config_packed(param, arg); 683 684 return 0; 685 686 default: 687 return -ENOTSUPP; 688 } 689 690 return -ENOTSUPP; 691 } 692 693 static int iproc_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin, 694 unsigned long *configs, unsigned num_configs) 695 { 696 struct iproc_gpio *chip = pinctrl_dev_get_drvdata(pctldev); 697 enum pin_config_param param; 698 u32 arg; 699 unsigned i, gpio = iproc_pin_to_gpio(pin); 700 int ret = -ENOTSUPP; 701 702 for (i = 0; i < num_configs; i++) { 703 param = pinconf_to_config_param(configs[i]); 704 705 if (iproc_pinconf_param_is_disabled(chip, param)) 706 return -ENOTSUPP; 707 708 arg = pinconf_to_config_argument(configs[i]); 709 710 switch (param) { 711 case PIN_CONFIG_BIAS_DISABLE: 712 ret = iproc_gpio_set_pull(chip, gpio, true, false); 713 if (ret < 0) 714 goto out; 715 break; 716 717 case PIN_CONFIG_BIAS_PULL_UP: 718 ret = iproc_gpio_set_pull(chip, gpio, false, true); 719 if (ret < 0) 720 goto out; 721 break; 722 723 case PIN_CONFIG_BIAS_PULL_DOWN: 724 ret = iproc_gpio_set_pull(chip, gpio, false, false); 725 if (ret < 0) 726 goto out; 727 break; 728 729 case PIN_CONFIG_DRIVE_STRENGTH: 730 ret = iproc_gpio_set_strength(chip, gpio, arg); 731 if (ret < 0) 732 goto out; 733 break; 734 735 default: 736 dev_err(chip->dev, "invalid configuration\n"); 737 return -ENOTSUPP; 738 } 739 } /* for each config */ 740 741 out: 742 return ret; 743 } 744 745 static const struct pinconf_ops iproc_pconf_ops = { 746 .is_generic = true, 747 .pin_config_get = iproc_pin_config_get, 748 .pin_config_set = iproc_pin_config_set, 749 }; 750 751 /* 752 * Iproc GPIO controller supports some PINCONF related configurations such as 753 * pull up, pull down, and drive strength, when the pin is configured to GPIO 754 * 755 * Here a local pinctrl device is created with simple 1-to-1 pin mapping to the 756 * local GPIO pins 757 */ 758 static int iproc_gpio_register_pinconf(struct iproc_gpio *chip) 759 { 760 struct pinctrl_desc *pctldesc = &chip->pctldesc; 761 struct pinctrl_pin_desc *pins; 762 struct gpio_chip *gc = &chip->gc; 763 int i; 764 765 pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL); 766 if (!pins) 767 return -ENOMEM; 768 769 for (i = 0; i < gc->ngpio; i++) { 770 pins[i].number = i; 771 pins[i].name = devm_kasprintf(chip->dev, GFP_KERNEL, 772 "gpio-%d", i); 773 if (!pins[i].name) 774 return -ENOMEM; 775 } 776 777 pctldesc->name = dev_name(chip->dev); 778 pctldesc->pctlops = &iproc_pctrl_ops; 779 pctldesc->pins = pins; 780 pctldesc->npins = gc->ngpio; 781 pctldesc->confops = &iproc_pconf_ops; 782 783 chip->pctl = devm_pinctrl_register(chip->dev, pctldesc, chip); 784 if (IS_ERR(chip->pctl)) { 785 dev_err(chip->dev, "unable to register pinctrl device\n"); 786 return PTR_ERR(chip->pctl); 787 } 788 789 return 0; 790 } 791 792 static const struct of_device_id iproc_gpio_of_match[] = { 793 { .compatible = "brcm,iproc-gpio" }, 794 { .compatible = "brcm,cygnus-ccm-gpio" }, 795 { .compatible = "brcm,cygnus-asiu-gpio" }, 796 { .compatible = "brcm,cygnus-crmu-gpio" }, 797 { .compatible = "brcm,iproc-nsp-gpio" }, 798 { .compatible = "brcm,iproc-stingray-gpio" }, 799 { /* sentinel */ } 800 }; 801 802 static int iproc_gpio_probe(struct platform_device *pdev) 803 { 804 struct device *dev = &pdev->dev; 805 struct resource *res; 806 struct iproc_gpio *chip; 807 struct gpio_chip *gc; 808 u32 ngpios, pinconf_disable_mask = 0; 809 int irq, ret; 810 bool no_pinconf = false; 811 enum iproc_pinconf_ctrl_type io_ctrl_type = IOCTRL_TYPE_INVALID; 812 813 /* NSP does not support drive strength config */ 814 if (of_device_is_compatible(dev->of_node, "brcm,iproc-nsp-gpio")) 815 pinconf_disable_mask = BIT(IPROC_PINCONF_DRIVE_STRENGTH); 816 /* Stingray does not support pinconf in this controller */ 817 else if (of_device_is_compatible(dev->of_node, 818 "brcm,iproc-stingray-gpio")) 819 no_pinconf = true; 820 821 chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL); 822 if (!chip) 823 return -ENOMEM; 824 825 chip->dev = dev; 826 platform_set_drvdata(pdev, chip); 827 828 chip->base = devm_platform_ioremap_resource(pdev, 0); 829 if (IS_ERR(chip->base)) { 830 dev_err(dev, "unable to map I/O memory\n"); 831 return PTR_ERR(chip->base); 832 } 833 834 res = platform_get_resource(pdev, IORESOURCE_MEM, 1); 835 if (res) { 836 chip->io_ctrl = devm_ioremap_resource(dev, res); 837 if (IS_ERR(chip->io_ctrl)) 838 return PTR_ERR(chip->io_ctrl); 839 if (of_device_is_compatible(dev->of_node, 840 "brcm,cygnus-ccm-gpio")) 841 io_ctrl_type = IOCTRL_TYPE_CDRU; 842 else 843 io_ctrl_type = IOCTRL_TYPE_AON; 844 } 845 846 chip->io_ctrl_type = io_ctrl_type; 847 848 if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) { 849 dev_err(&pdev->dev, "missing ngpios DT property\n"); 850 return -ENODEV; 851 } 852 853 raw_spin_lock_init(&chip->lock); 854 855 gc = &chip->gc; 856 gc->base = -1; 857 gc->ngpio = ngpios; 858 chip->num_banks = (ngpios + NGPIOS_PER_BANK - 1) / NGPIOS_PER_BANK; 859 gc->label = dev_name(dev); 860 gc->parent = dev; 861 gc->request = iproc_gpio_request; 862 gc->free = iproc_gpio_free; 863 gc->direction_input = iproc_gpio_direction_input; 864 gc->direction_output = iproc_gpio_direction_output; 865 gc->get_direction = iproc_gpio_get_direction; 866 gc->set = iproc_gpio_set; 867 gc->get = iproc_gpio_get; 868 869 chip->pinmux_is_supported = of_property_read_bool(dev->of_node, 870 "gpio-ranges"); 871 872 /* optional GPIO interrupt support */ 873 irq = platform_get_irq_optional(pdev, 0); 874 if (irq > 0) { 875 struct gpio_irq_chip *girq; 876 877 girq = &gc->irq; 878 gpio_irq_chip_set_chip(girq, &iproc_gpio_irq_chip); 879 girq->parent_handler = iproc_gpio_irq_handler; 880 girq->num_parents = 1; 881 girq->parents = devm_kcalloc(dev, 1, 882 sizeof(*girq->parents), 883 GFP_KERNEL); 884 if (!girq->parents) 885 return -ENOMEM; 886 girq->parents[0] = irq; 887 girq->default_type = IRQ_TYPE_NONE; 888 girq->handler = handle_bad_irq; 889 } 890 891 ret = gpiochip_add_data(gc, chip); 892 if (ret < 0) 893 return dev_err_probe(dev, ret, "unable to add GPIO chip\n"); 894 895 if (!no_pinconf) { 896 ret = iproc_gpio_register_pinconf(chip); 897 if (ret) { 898 dev_err(dev, "unable to register pinconf\n"); 899 goto err_rm_gpiochip; 900 } 901 902 if (pinconf_disable_mask) { 903 ret = iproc_pinconf_disable_map_create(chip, 904 pinconf_disable_mask); 905 if (ret) { 906 dev_err(dev, 907 "unable to create pinconf disable map\n"); 908 goto err_rm_gpiochip; 909 } 910 } 911 } 912 913 return 0; 914 915 err_rm_gpiochip: 916 gpiochip_remove(gc); 917 918 return ret; 919 } 920 921 static struct platform_driver iproc_gpio_driver = { 922 .driver = { 923 .name = "iproc-gpio", 924 .of_match_table = iproc_gpio_of_match, 925 }, 926 .probe = iproc_gpio_probe, 927 }; 928 929 static int __init iproc_gpio_init(void) 930 { 931 return platform_driver_register(&iproc_gpio_driver); 932 } 933 arch_initcall_sync(iproc_gpio_init); 934