drivers/pinctrl/bcm/pinctrl-iproc-gpio.c

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