drivers/pinctrl/pinctrl-at91-pio4.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Driver for the Atmel PIO4 controller
   4  *
   5  * Copyright (C) 2015 Atmel,
   6  *               2015 Ludovic Desroches <ludovic.desroches@atmel.com>
   7  */
   8
   9 #include <dt-bindings/pinctrl/at91.h>
  10 #include <linux/clk.h>
  11 #include <linux/gpio/driver.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/io.h>
  14 #include <linux/init.h>
  15 #include <linux/of.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/pinctrl/pinconf.h>
  18 #include <linux/pinctrl/pinconf-generic.h>
  19 #include <linux/pinctrl/pinctrl.h>
  20 #include <linux/pinctrl/pinmux.h>
  21 #include <linux/slab.h>
  22 #include "core.h"
  23 #include "pinconf.h"
  24 #include "pinctrl-utils.h"
  25
  26 /*
  27  * Warning:
  28  * In order to not introduce confusion between Atmel PIO groups and pinctrl
  29  * framework groups, Atmel PIO groups will be called banks, line is kept to
  30  * designed the pin id into this bank.
  31  */
  32
  33 #define ATMEL_PIO_MSKR          0x0000
  34 #define ATMEL_PIO_CFGR          0x0004
  35 #define         ATMEL_PIO_CFGR_FUNC_MASK        GENMASK(2, 0)
  36 #define         ATMEL_PIO_DIR_MASK              BIT(8)
  37 #define         ATMEL_PIO_PUEN_MASK             BIT(9)
  38 #define         ATMEL_PIO_PDEN_MASK             BIT(10)
  39 #define         ATMEL_PIO_SR_MASK               BIT(11)
  40 #define         ATMEL_PIO_IFEN_MASK             BIT(12)
  41 #define         ATMEL_PIO_IFSCEN_MASK           BIT(13)
  42 #define         ATMEL_PIO_OPD_MASK              BIT(14)
  43 #define         ATMEL_PIO_SCHMITT_MASK          BIT(15)
  44 #define         ATMEL_PIO_DRVSTR_MASK           GENMASK(17, 16)
  45 #define         ATMEL_PIO_DRVSTR_OFFSET         16
  46 #define         ATMEL_PIO_CFGR_EVTSEL_MASK      GENMASK(26, 24)
  47 #define         ATMEL_PIO_CFGR_EVTSEL_FALLING   (0 << 24)
  48 #define         ATMEL_PIO_CFGR_EVTSEL_RISING    (1 << 24)
  49 #define         ATMEL_PIO_CFGR_EVTSEL_BOTH      (2 << 24)
  50 #define         ATMEL_PIO_CFGR_EVTSEL_LOW       (3 << 24)
  51 #define         ATMEL_PIO_CFGR_EVTSEL_HIGH      (4 << 24)
  52 #define ATMEL_PIO_PDSR          0x0008
  53 #define ATMEL_PIO_LOCKSR        0x000C
  54 #define ATMEL_PIO_SODR          0x0010
  55 #define ATMEL_PIO_CODR          0x0014
  56 #define ATMEL_PIO_ODSR          0x0018
  57 #define ATMEL_PIO_IER           0x0020
  58 #define ATMEL_PIO_IDR           0x0024
  59 #define ATMEL_PIO_IMR           0x0028
  60 #define ATMEL_PIO_ISR           0x002C
  61 #define ATMEL_PIO_IOFR          0x003C
  62
  63 #define ATMEL_PIO_NPINS_PER_BANK        32
  64 #define ATMEL_PIO_BANK(pin_id)          (pin_id / ATMEL_PIO_NPINS_PER_BANK)
  65 #define ATMEL_PIO_LINE(pin_id)          (pin_id % ATMEL_PIO_NPINS_PER_BANK)
  66 #define ATMEL_PIO_BANK_OFFSET           0x40
  67
  68 #define ATMEL_GET_PIN_NO(pinfunc)       ((pinfunc) & 0xff)
  69 #define ATMEL_GET_PIN_FUNC(pinfunc)     ((pinfunc >> 16) & 0xf)
  70 #define ATMEL_GET_PIN_IOSET(pinfunc)    ((pinfunc >> 20) & 0xf)
  71
  72 /* Custom pinconf parameters */
  73 #define ATMEL_PIN_CONFIG_DRIVE_STRENGTH (PIN_CONFIG_END + 1)
  74
  75 /**
  76  * struct atmel_pioctrl_data - Atmel PIO controller (pinmux + gpio) data struct
  77  * @nbanks: number of PIO banks
  78  * @last_bank_count: number of lines in the last bank (can be less than
  79  *      the rest of the banks).
  80  * @slew_rate_support: slew rate support
  81  */
  82 struct atmel_pioctrl_data {
  83         unsigned int nbanks;
  84         unsigned int last_bank_count;
  85         unsigned int slew_rate_support;
  86 };
  87
  88 struct atmel_group {
  89         const char *name;
  90         u32 pin;
  91 };
  92
  93 struct atmel_pin {
  94         unsigned int pin_id;
  95         unsigned int mux;
  96         unsigned int ioset;
  97         unsigned int bank;
  98         unsigned int line;
  99         const char *device;
 100 };
 101
 102 /**
 103  * struct atmel_pioctrl - Atmel PIO controller (pinmux + gpio)
 104  * @reg_base: base address of the controller.
 105  * @clk: clock of the controller.
 106  * @nbanks: number of PIO groups, it can vary depending on the SoC.
 107  * @pinctrl_dev: pinctrl device registered.
 108  * @groups: groups table to provide group name and pin in the group to pinctrl.
 109  * @group_names: group names table to provide all the group/pin names to
 110  *     pinctrl or gpio.
 111  * @pins: pins table used for both pinctrl and gpio. pin_id, bank and line
 112  *     fields are set at probe time. Other ones are set when parsing dt
 113  *     pinctrl.
 114  * @npins: number of pins.
 115  * @gpio_chip: gpio chip registered.
 116  * @irq_domain: irq domain for the gpio controller.
 117  * @irqs: table containing the hw irq number of the bank. The index of the
 118  *     table is the bank id.
 119  * @pm_wakeup_sources: bitmap of wakeup sources (lines)
 120  * @pm_suspend_backup: backup/restore register values on suspend/resume
 121  * @dev: device entry for the Atmel PIO controller.
 122  * @node: node of the Atmel PIO controller.
 123  * @slew_rate_support: slew rate support
 124  */
 125 struct atmel_pioctrl {
 126         void __iomem            *reg_base;
 127         struct clk              *clk;
 128         unsigned int            nbanks;
 129         struct pinctrl_dev      *pinctrl_dev;
 130         struct atmel_group      *groups;
 131         const char * const      *group_names;
 132         struct atmel_pin        **pins;
 133         unsigned int            npins;
 134         struct gpio_chip        *gpio_chip;
 135         struct irq_domain       *irq_domain;
 136         int                     *irqs;
 137         unsigned int            *pm_wakeup_sources;
 138         struct {
 139                 u32             imr;
 140                 u32             odsr;
 141                 u32             cfgr[ATMEL_PIO_NPINS_PER_BANK];
 142         } *pm_suspend_backup;
 143         struct device           *dev;
 144         struct device_node      *node;
 145         unsigned int            slew_rate_support;
 146 };
 147
 148 static const char * const atmel_functions[] = {
 149         "GPIO", "A", "B", "C", "D", "E", "F", "G"
 150 };
 151
 152 static const struct pinconf_generic_params atmel_custom_bindings[] = {
 153         {"atmel,drive-strength", ATMEL_PIN_CONFIG_DRIVE_STRENGTH, 0},
 154 };
 155
 156 /* --- GPIO --- */
 157 static unsigned int atmel_gpio_read(struct atmel_pioctrl *atmel_pioctrl,
 158                                     unsigned int bank, unsigned int reg)
 159 {
 160         return readl_relaxed(atmel_pioctrl->reg_base
 161                              + ATMEL_PIO_BANK_OFFSET * bank + reg);
 162 }
 163
 164 static void atmel_gpio_write(struct atmel_pioctrl *atmel_pioctrl,
 165                              unsigned int bank, unsigned int reg,
 166                              unsigned int val)
 167 {
 168         writel_relaxed(val, atmel_pioctrl->reg_base
 169                        + ATMEL_PIO_BANK_OFFSET * bank + reg);
 170 }
 171
 172 static void atmel_gpio_irq_ack(struct irq_data *d)
 173 {
 174         /*
 175          * Nothing to do, interrupt is cleared when reading the status
 176          * register.
 177          */
 178 }
 179
 180 static int atmel_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 181 {
 182         struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
 183         struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
 184         unsigned int reg;
 185
 186         atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
 187                          BIT(pin->line));
 188         reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
 189         reg &= (~ATMEL_PIO_CFGR_EVTSEL_MASK);
 190
 191         switch (type) {
 192         case IRQ_TYPE_EDGE_RISING:
 193                 irq_set_handler_locked(d, handle_edge_irq);
 194                 reg |= ATMEL_PIO_CFGR_EVTSEL_RISING;
 195                 break;
 196         case IRQ_TYPE_EDGE_FALLING:
 197                 irq_set_handler_locked(d, handle_edge_irq);
 198                 reg |= ATMEL_PIO_CFGR_EVTSEL_FALLING;
 199                 break;
 200         case IRQ_TYPE_EDGE_BOTH:
 201                 irq_set_handler_locked(d, handle_edge_irq);
 202                 reg |= ATMEL_PIO_CFGR_EVTSEL_BOTH;
 203                 break;
 204         case IRQ_TYPE_LEVEL_LOW:
 205                 irq_set_handler_locked(d, handle_level_irq);
 206                 reg |= ATMEL_PIO_CFGR_EVTSEL_LOW;
 207                 break;
 208         case IRQ_TYPE_LEVEL_HIGH:
 209                 irq_set_handler_locked(d, handle_level_irq);
 210                 reg |= ATMEL_PIO_CFGR_EVTSEL_HIGH;
 211                 break;
 212         case IRQ_TYPE_NONE:
 213         default:
 214                 return -EINVAL;
 215         }
 216
 217         atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
 218
 219         return 0;
 220 }
 221
 222 static void atmel_gpio_irq_mask(struct irq_data *d)
 223 {
 224         struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
 225         struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
 226
 227         atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_IDR,
 228                          BIT(pin->line));
 229 }
 230
 231 static void atmel_gpio_irq_unmask(struct irq_data *d)
 232 {
 233         struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
 234         struct atmel_pin *pin = atmel_pioctrl->pins[d->hwirq];
 235
 236         atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_IER,
 237                          BIT(pin->line));
 238 }
 239
 240 static int atmel_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
 241 {
 242         struct atmel_pioctrl *atmel_pioctrl = irq_data_get_irq_chip_data(d);
 243         int bank = ATMEL_PIO_BANK(d->hwirq);
 244         int line = ATMEL_PIO_LINE(d->hwirq);
 245
 246         /* The gpio controller has one interrupt line per bank. */
 247         irq_set_irq_wake(atmel_pioctrl->irqs[bank], on);
 248
 249         if (on)
 250                 atmel_pioctrl->pm_wakeup_sources[bank] |= BIT(line);
 251         else
 252                 atmel_pioctrl->pm_wakeup_sources[bank] &= ~(BIT(line));
 253
 254         return 0;
 255 }
 256
 257 static struct irq_chip atmel_gpio_irq_chip = {
 258         .name           = "GPIO",
 259         .irq_ack        = atmel_gpio_irq_ack,
 260         .irq_mask       = atmel_gpio_irq_mask,
 261         .irq_unmask     = atmel_gpio_irq_unmask,
 262         .irq_set_type   = atmel_gpio_irq_set_type,
 263         .irq_set_wake   = pm_sleep_ptr(atmel_gpio_irq_set_wake),
 264 };
 265
 266 static int atmel_gpio_to_irq(struct gpio_chip *chip, unsigned int offset)
 267 {
 268         struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
 269
 270         return irq_find_mapping(atmel_pioctrl->irq_domain, offset);
 271 }
 272
 273 static void atmel_gpio_irq_handler(struct irq_desc *desc)
 274 {
 275         unsigned int irq = irq_desc_get_irq(desc);
 276         struct atmel_pioctrl *atmel_pioctrl = irq_desc_get_handler_data(desc);
 277         struct irq_chip *chip = irq_desc_get_chip(desc);
 278         unsigned long isr;
 279         int n, bank = -1;
 280
 281         /* Find from which bank is the irq received. */
 282         for (n = 0; n < atmel_pioctrl->nbanks; n++) {
 283                 if (atmel_pioctrl->irqs[n] == irq) {
 284                         bank = n;
 285                         break;
 286                 }
 287         }
 288
 289         if (bank < 0) {
 290                 dev_err(atmel_pioctrl->dev,
 291                         "no bank associated to irq %u\n", irq);
 292                 return;
 293         }
 294
 295         chained_irq_enter(chip, desc);
 296
 297         for (;;) {
 298                 isr = (unsigned long)atmel_gpio_read(atmel_pioctrl, bank,
 299                                                      ATMEL_PIO_ISR);
 300                 isr &= (unsigned long)atmel_gpio_read(atmel_pioctrl, bank,
 301                                                       ATMEL_PIO_IMR);
 302                 if (!isr)
 303                         break;
 304
 305                 for_each_set_bit(n, &isr, BITS_PER_LONG)
 306                         generic_handle_irq(atmel_gpio_to_irq(
 307                                         atmel_pioctrl->gpio_chip,
 308                                         bank * ATMEL_PIO_NPINS_PER_BANK + n));
 309         }
 310
 311         chained_irq_exit(chip, desc);
 312 }
 313
 314 static int atmel_gpio_direction_input(struct gpio_chip *chip,
 315                                       unsigned int offset)
 316 {
 317         struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
 318         struct atmel_pin *pin = atmel_pioctrl->pins[offset];
 319         unsigned int reg;
 320
 321         atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
 322                          BIT(pin->line));
 323         reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
 324         reg &= ~ATMEL_PIO_DIR_MASK;
 325         atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
 326
 327         return 0;
 328 }
 329
 330 static int atmel_gpio_get(struct gpio_chip *chip, unsigned int offset)
 331 {
 332         struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
 333         struct atmel_pin *pin = atmel_pioctrl->pins[offset];
 334         unsigned int reg;
 335
 336         reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_PDSR);
 337
 338         return !!(reg & BIT(pin->line));
 339 }
 340
 341 static int atmel_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask,
 342                                    unsigned long *bits)
 343 {
 344         struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
 345         unsigned int bank;
 346
 347         bitmap_zero(bits, atmel_pioctrl->npins);
 348
 349         for (bank = 0; bank < atmel_pioctrl->nbanks; bank++) {
 350                 unsigned int word = bank;
 351                 unsigned int offset = 0;
 352                 unsigned int reg;
 353
 354 #if ATMEL_PIO_NPINS_PER_BANK != BITS_PER_LONG
 355                 word = BIT_WORD(bank * ATMEL_PIO_NPINS_PER_BANK);
 356                 offset = bank * ATMEL_PIO_NPINS_PER_BANK % BITS_PER_LONG;
 357 #endif
 358                 if (!mask[word])
 359                         continue;
 360
 361                 reg = atmel_gpio_read(atmel_pioctrl, bank, ATMEL_PIO_PDSR);
 362                 bits[word] |= mask[word] & (reg << offset);
 363         }
 364
 365         return 0;
 366 }
 367
 368 static int atmel_gpio_direction_output(struct gpio_chip *chip,
 369                                        unsigned int offset,
 370                                        int value)
 371 {
 372         struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
 373         struct atmel_pin *pin = atmel_pioctrl->pins[offset];
 374         unsigned int reg;
 375
 376         atmel_gpio_write(atmel_pioctrl, pin->bank,
 377                          value ? ATMEL_PIO_SODR : ATMEL_PIO_CODR,
 378                          BIT(pin->line));
 379
 380         atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_MSKR,
 381                          BIT(pin->line));
 382         reg = atmel_gpio_read(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR);
 383         reg |= ATMEL_PIO_DIR_MASK;
 384         atmel_gpio_write(atmel_pioctrl, pin->bank, ATMEL_PIO_CFGR, reg);
 385
 386         return 0;
 387 }
 388
 389 static void atmel_gpio_set(struct gpio_chip *chip, unsigned int offset, int val)
 390 {
 391         struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
 392         struct atmel_pin *pin = atmel_pioctrl->pins[offset];
 393
 394         atmel_gpio_write(atmel_pioctrl, pin->bank,
 395                          val ? ATMEL_PIO_SODR : ATMEL_PIO_CODR,
 396                          BIT(pin->line));
 397 }
 398
 399 static void atmel_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask,
 400                                     unsigned long *bits)
 401 {
 402         struct atmel_pioctrl *atmel_pioctrl = gpiochip_get_data(chip);
 403         unsigned int bank;
 404
 405         for (bank = 0; bank < atmel_pioctrl->nbanks; bank++) {
 406                 unsigned int bitmask;
 407                 unsigned int word = bank;
 408
 409 /*
 410  * On a 64-bit platform, BITS_PER_LONG is 64 so it is necessary to iterate over
 411  * two 32bit words to handle the whole  bitmask
 412  */
 413 #if ATMEL_PIO_NPINS_PER_BANK != BITS_PER_LONG
 414                 word = BIT_WORD(bank * ATMEL_PIO_NPINS_PER_BANK);
 415 #endif
 416                 if (!mask[word])
 417                         continue;
 418
 419                 bitmask = mask[word] & bits[word];
 420                 atmel_gpio_write(atmel_pioctrl, bank, ATMEL_PIO_SODR, bitmask);
 421
 422                 bitmask = mask[word] & ~bits[word];
 423                 atmel_gpio_write(atmel_pioctrl, bank, ATMEL_PIO_CODR, bitmask);
 424
 425 #if ATMEL_PIO_NPINS_PER_BANK != BITS_PER_LONG
 426                 mask[word] >>= ATMEL_PIO_NPINS_PER_BANK;
 427                 bits[word] >>= ATMEL_PIO_NPINS_PER_BANK;
 428 #endif
 429         }
 430 }
 431
 432 static struct gpio_chip atmel_gpio_chip = {
 433         .direction_input        = atmel_gpio_direction_input,
 434         .get                    = atmel_gpio_get,
 435         .get_multiple           = atmel_gpio_get_multiple,
 436         .direction_output       = atmel_gpio_direction_output,
 437         .set                    = atmel_gpio_set,
 438         .set_multiple           = atmel_gpio_set_multiple,
 439         .to_irq                 = atmel_gpio_to_irq,
 440         .base                   = 0,
 441 };
 442
 443 /* --- PINCTRL --- */
 444 static unsigned int atmel_pin_config_read(struct pinctrl_dev *pctldev,
 445                                           unsigned int pin_id)
 446 {
 447         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 448         unsigned int bank = atmel_pioctrl->pins[pin_id]->bank;
 449         unsigned int line = atmel_pioctrl->pins[pin_id]->line;
 450         void __iomem *addr = atmel_pioctrl->reg_base
 451                              + bank * ATMEL_PIO_BANK_OFFSET;
 452
 453         writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR);
 454         /* Have to set MSKR first, to access the right pin CFGR. */
 455         wmb();
 456
 457         return readl_relaxed(addr + ATMEL_PIO_CFGR);
 458 }
 459
 460 static void atmel_pin_config_write(struct pinctrl_dev *pctldev,
 461                                    unsigned int pin_id, u32 conf)
 462 {
 463         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 464         unsigned int bank = atmel_pioctrl->pins[pin_id]->bank;
 465         unsigned int line = atmel_pioctrl->pins[pin_id]->line;
 466         void __iomem *addr = atmel_pioctrl->reg_base
 467                              + bank * ATMEL_PIO_BANK_OFFSET;
 468
 469         writel_relaxed(BIT(line), addr + ATMEL_PIO_MSKR);
 470         /* Have to set MSKR first, to access the right pin CFGR. */
 471         wmb();
 472         writel_relaxed(conf, addr + ATMEL_PIO_CFGR);
 473 }
 474
 475 static int atmel_pctl_get_groups_count(struct pinctrl_dev *pctldev)
 476 {
 477         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 478
 479         return atmel_pioctrl->npins;
 480 }
 481
 482 static const char *atmel_pctl_get_group_name(struct pinctrl_dev *pctldev,
 483                                              unsigned int selector)
 484 {
 485         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 486
 487         return atmel_pioctrl->groups[selector].name;
 488 }
 489
 490 static int atmel_pctl_get_group_pins(struct pinctrl_dev *pctldev,
 491                                      unsigned int selector,
 492                                      const unsigned int **pins,
 493                                      unsigned int *num_pins)
 494 {
 495         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 496
 497         *pins = (unsigned int *)&atmel_pioctrl->groups[selector].pin;
 498         *num_pins = 1;
 499
 500         return 0;
 501 }
 502
 503 static struct atmel_group *
 504 atmel_pctl_find_group_by_pin(struct pinctrl_dev *pctldev, unsigned int pin)
 505 {
 506         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 507         int i;
 508
 509         for (i = 0; i < atmel_pioctrl->npins; i++) {
 510                 struct atmel_group *grp = atmel_pioctrl->groups + i;
 511
 512                 if (grp->pin == pin)
 513                         return grp;
 514         }
 515
 516         return NULL;
 517 }
 518
 519 static int atmel_pctl_xlate_pinfunc(struct pinctrl_dev *pctldev,
 520                                     struct device_node *np,
 521                                     u32 pinfunc, const char **grp_name,
 522                                     const char **func_name)
 523 {
 524         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 525         unsigned int pin_id, func_id;
 526         struct atmel_group *grp;
 527
 528         pin_id = ATMEL_GET_PIN_NO(pinfunc);
 529         func_id = ATMEL_GET_PIN_FUNC(pinfunc);
 530
 531         if (func_id >= ARRAY_SIZE(atmel_functions))
 532                 return -EINVAL;
 533
 534         *func_name = atmel_functions[func_id];
 535
 536         grp = atmel_pctl_find_group_by_pin(pctldev, pin_id);
 537         if (!grp)
 538                 return -EINVAL;
 539         *grp_name = grp->name;
 540
 541         atmel_pioctrl->pins[pin_id]->mux = func_id;
 542         atmel_pioctrl->pins[pin_id]->ioset = ATMEL_GET_PIN_IOSET(pinfunc);
 543         /* Want the device name not the group one. */
 544         if (np->parent == atmel_pioctrl->node)
 545                 atmel_pioctrl->pins[pin_id]->device = np->name;
 546         else
 547                 atmel_pioctrl->pins[pin_id]->device = np->parent->name;
 548
 549         return 0;
 550 }
 551
 552 static int atmel_pctl_dt_subnode_to_map(struct pinctrl_dev *pctldev,
 553                                         struct device_node *np,
 554                                         struct pinctrl_map **map,
 555                                         unsigned int *reserved_maps,
 556                                         unsigned int *num_maps)
 557 {
 558         unsigned int num_pins, num_configs, reserve;
 559         unsigned long *configs;
 560         struct property *pins;
 561         u32 pinfunc;
 562         int ret, i;
 563
 564         pins = of_find_property(np, "pinmux", NULL);
 565         if (!pins)
 566                 return -EINVAL;
 567
 568         ret = pinconf_generic_parse_dt_config(np, pctldev, &configs,
 569                                               &num_configs);
 570         if (ret < 0) {
 571                 dev_err(pctldev->dev, "%pOF: could not parse node property\n",
 572                         np);
 573                 return ret;
 574         }
 575
 576         num_pins = pins->length / sizeof(u32);
 577         if (!num_pins) {
 578                 dev_err(pctldev->dev, "no pins found in node %pOF\n", np);
 579                 ret = -EINVAL;
 580                 goto exit;
 581         }
 582
 583         /*
 584          * Reserve maps, at least there is a mux map and an optional conf
 585          * map for each pin.
 586          */
 587         reserve = 1;
 588         if (num_configs)
 589                 reserve++;
 590         reserve *= num_pins;
 591         ret = pinctrl_utils_reserve_map(pctldev, map, reserved_maps, num_maps,
 592                                         reserve);
 593         if (ret < 0)
 594                 goto exit;
 595
 596         for (i = 0; i < num_pins; i++) {
 597                 const char *group, *func;
 598
 599                 ret = of_property_read_u32_index(np, "pinmux", i, &pinfunc);
 600                 if (ret)
 601                         goto exit;
 602
 603                 ret = atmel_pctl_xlate_pinfunc(pctldev, np, pinfunc, &group,
 604                                                &func);
 605                 if (ret)
 606                         goto exit;
 607
 608                 pinctrl_utils_add_map_mux(pctldev, map, reserved_maps, num_maps,
 609                                           group, func);
 610
 611                 if (num_configs) {
 612                         ret = pinctrl_utils_add_map_configs(pctldev, map,
 613                                         reserved_maps, num_maps, group,
 614                                         configs, num_configs,
 615                                         PIN_MAP_TYPE_CONFIGS_GROUP);
 616                         if (ret < 0)
 617                                 goto exit;
 618                 }
 619         }
 620
 621 exit:
 622         kfree(configs);
 623         return ret;
 624 }
 625
 626 static int atmel_pctl_dt_node_to_map(struct pinctrl_dev *pctldev,
 627                                      struct device_node *np_config,
 628                                      struct pinctrl_map **map,
 629                                      unsigned int *num_maps)
 630 {
 631         struct device_node *np;
 632         unsigned int reserved_maps;
 633         int ret;
 634
 635         *map = NULL;
 636         *num_maps = 0;
 637         reserved_maps = 0;
 638
 639         /*
 640          * If all the pins of a device have the same configuration (or no one),
 641          * it is useless to add a subnode, so directly parse node referenced by
 642          * phandle.
 643          */
 644         ret = atmel_pctl_dt_subnode_to_map(pctldev, np_config, map,
 645                                            &reserved_maps, num_maps);
 646         if (ret) {
 647                 for_each_child_of_node(np_config, np) {
 648                         ret = atmel_pctl_dt_subnode_to_map(pctldev, np, map,
 649                                                     &reserved_maps, num_maps);
 650                         if (ret < 0) {
 651                                 of_node_put(np);
 652                                 break;
 653                         }
 654                 }
 655         }
 656
 657         if (ret < 0) {
 658                 pinctrl_utils_free_map(pctldev, *map, *num_maps);
 659                 dev_err(pctldev->dev, "can't create maps for node %pOF\n",
 660                         np_config);
 661         }
 662
 663         return ret;
 664 }
 665
 666 static const struct pinctrl_ops atmel_pctlops = {
 667         .get_groups_count       = atmel_pctl_get_groups_count,
 668         .get_group_name         = atmel_pctl_get_group_name,
 669         .get_group_pins         = atmel_pctl_get_group_pins,
 670         .dt_node_to_map         = atmel_pctl_dt_node_to_map,
 671         .dt_free_map            = pinctrl_utils_free_map,
 672 };
 673
 674 static int atmel_pmx_get_functions_count(struct pinctrl_dev *pctldev)
 675 {
 676         return ARRAY_SIZE(atmel_functions);
 677 }
 678
 679 static const char *atmel_pmx_get_function_name(struct pinctrl_dev *pctldev,
 680                                                unsigned int selector)
 681 {
 682         return atmel_functions[selector];
 683 }
 684
 685 static int atmel_pmx_get_function_groups(struct pinctrl_dev *pctldev,
 686                                          unsigned int selector,
 687                                          const char * const **groups,
 688                                          unsigned * const num_groups)
 689 {
 690         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 691
 692         *groups = atmel_pioctrl->group_names;
 693         *num_groups = atmel_pioctrl->npins;
 694
 695         return 0;
 696 }
 697
 698 static int atmel_pmx_set_mux(struct pinctrl_dev *pctldev,
 699                              unsigned int function,
 700                              unsigned int group)
 701 {
 702         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 703         unsigned int pin;
 704         u32 conf;
 705
 706         dev_dbg(pctldev->dev, "enable function %s group %s\n",
 707                 atmel_functions[function], atmel_pioctrl->groups[group].name);
 708
 709         pin = atmel_pioctrl->groups[group].pin;
 710         conf = atmel_pin_config_read(pctldev, pin);
 711         conf &= (~ATMEL_PIO_CFGR_FUNC_MASK);
 712         conf |= (function & ATMEL_PIO_CFGR_FUNC_MASK);
 713         dev_dbg(pctldev->dev, "pin: %u, conf: 0x%08x\n", pin, conf);
 714         atmel_pin_config_write(pctldev, pin, conf);
 715
 716         return 0;
 717 }
 718
 719 static const struct pinmux_ops atmel_pmxops = {
 720         .get_functions_count    = atmel_pmx_get_functions_count,
 721         .get_function_name      = atmel_pmx_get_function_name,
 722         .get_function_groups    = atmel_pmx_get_function_groups,
 723         .set_mux                = atmel_pmx_set_mux,
 724 };
 725
 726 static int atmel_conf_pin_config_group_get(struct pinctrl_dev *pctldev,
 727                                            unsigned int group,
 728                                            unsigned long *config)
 729 {
 730         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 731         unsigned int param = pinconf_to_config_param(*config), arg = 0;
 732         struct atmel_group *grp = atmel_pioctrl->groups + group;
 733         unsigned int pin_id = grp->pin;
 734         u32 res;
 735
 736         res = atmel_pin_config_read(pctldev, pin_id);
 737
 738         switch (param) {
 739         case PIN_CONFIG_BIAS_PULL_UP:
 740                 if (!(res & ATMEL_PIO_PUEN_MASK))
 741                         return -EINVAL;
 742                 arg = 1;
 743                 break;
 744         case PIN_CONFIG_BIAS_PULL_DOWN:
 745                 if ((res & ATMEL_PIO_PUEN_MASK) ||
 746                     (!(res & ATMEL_PIO_PDEN_MASK)))
 747                         return -EINVAL;
 748                 arg = 1;
 749                 break;
 750         case PIN_CONFIG_BIAS_DISABLE:
 751                 if ((res & ATMEL_PIO_PUEN_MASK) ||
 752                     ((res & ATMEL_PIO_PDEN_MASK)))
 753                         return -EINVAL;
 754                 arg = 1;
 755                 break;
 756         case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 757                 if (!(res & ATMEL_PIO_OPD_MASK))
 758                         return -EINVAL;
 759                 arg = 1;
 760                 break;
 761         case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
 762                 if (!(res & ATMEL_PIO_SCHMITT_MASK))
 763                         return -EINVAL;
 764                 arg = 1;
 765                 break;
 766         case PIN_CONFIG_SLEW_RATE:
 767                 if (!atmel_pioctrl->slew_rate_support)
 768                         return -EOPNOTSUPP;
 769                 if (!(res & ATMEL_PIO_SR_MASK))
 770                         return -EINVAL;
 771                 arg = 1;
 772                 break;
 773         case ATMEL_PIN_CONFIG_DRIVE_STRENGTH:
 774                 if (!(res & ATMEL_PIO_DRVSTR_MASK))
 775                         return -EINVAL;
 776                 arg = (res & ATMEL_PIO_DRVSTR_MASK) >> ATMEL_PIO_DRVSTR_OFFSET;
 777                 break;
 778         default:
 779                 return -ENOTSUPP;
 780         }
 781
 782         *config = pinconf_to_config_packed(param, arg);
 783         return 0;
 784 }
 785
 786 static int atmel_conf_pin_config_group_set(struct pinctrl_dev *pctldev,
 787                                            unsigned int group,
 788                                            unsigned long *configs,
 789                                            unsigned int num_configs)
 790 {
 791         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 792         struct atmel_group *grp = atmel_pioctrl->groups + group;
 793         unsigned int bank, pin, pin_id = grp->pin;
 794         u32 mask, conf = 0;
 795         int i;
 796
 797         conf = atmel_pin_config_read(pctldev, pin_id);
 798
 799         /* Keep slew rate enabled by default. */
 800         if (atmel_pioctrl->slew_rate_support)
 801                 conf |= ATMEL_PIO_SR_MASK;
 802
 803         for (i = 0; i < num_configs; i++) {
 804                 unsigned int param = pinconf_to_config_param(configs[i]);
 805                 unsigned int arg = pinconf_to_config_argument(configs[i]);
 806
 807                 dev_dbg(pctldev->dev, "%s: pin=%u, config=0x%lx\n",
 808                         __func__, pin_id, configs[i]);
 809
 810                 switch (param) {
 811                 case PIN_CONFIG_BIAS_DISABLE:
 812                         conf &= (~ATMEL_PIO_PUEN_MASK);
 813                         conf &= (~ATMEL_PIO_PDEN_MASK);
 814                         break;
 815                 case PIN_CONFIG_BIAS_PULL_UP:
 816                         conf |= ATMEL_PIO_PUEN_MASK;
 817                         conf &= (~ATMEL_PIO_PDEN_MASK);
 818                         break;
 819                 case PIN_CONFIG_BIAS_PULL_DOWN:
 820                         conf |= ATMEL_PIO_PDEN_MASK;
 821                         conf &= (~ATMEL_PIO_PUEN_MASK);
 822                         break;
 823                 case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 824                         if (arg == 0)
 825                                 conf &= (~ATMEL_PIO_OPD_MASK);
 826                         else
 827                                 conf |= ATMEL_PIO_OPD_MASK;
 828                         break;
 829                 case PIN_CONFIG_INPUT_SCHMITT_ENABLE:
 830                         if (arg == 0)
 831                                 conf |= ATMEL_PIO_SCHMITT_MASK;
 832                         else
 833                                 conf &= (~ATMEL_PIO_SCHMITT_MASK);
 834                         break;
 835                 case PIN_CONFIG_INPUT_DEBOUNCE:
 836                         if (arg == 0) {
 837                                 conf &= (~ATMEL_PIO_IFEN_MASK);
 838                                 conf &= (~ATMEL_PIO_IFSCEN_MASK);
 839                         } else {
 840                                 /*
 841                                  * We don't care about the debounce value for several reasons:
 842                                  * - can't have different debounce periods inside a same group,
 843                                  * - the register to configure this period is a secure register.
 844                                  * The debouncing filter can filter a pulse with a duration of less
 845                                  * than 1/2 slow clock period.
 846                                  */
 847                                 conf |= ATMEL_PIO_IFEN_MASK;
 848                                 conf |= ATMEL_PIO_IFSCEN_MASK;
 849                         }
 850                         break;
 851                 case PIN_CONFIG_OUTPUT:
 852                         conf |= ATMEL_PIO_DIR_MASK;
 853                         bank = ATMEL_PIO_BANK(pin_id);
 854                         pin = ATMEL_PIO_LINE(pin_id);
 855                         mask = 1 << pin;
 856
 857                         if (arg == 0) {
 858                                 writel_relaxed(mask, atmel_pioctrl->reg_base +
 859                                         bank * ATMEL_PIO_BANK_OFFSET +
 860                                         ATMEL_PIO_CODR);
 861                         } else {
 862                                 writel_relaxed(mask, atmel_pioctrl->reg_base +
 863                                         bank * ATMEL_PIO_BANK_OFFSET +
 864                                         ATMEL_PIO_SODR);
 865                         }
 866                         break;
 867                 case PIN_CONFIG_SLEW_RATE:
 868                         if (!atmel_pioctrl->slew_rate_support)
 869                                 break;
 870                         /* And remove it if explicitly requested. */
 871                         if (arg == 0)
 872                                 conf &= ~ATMEL_PIO_SR_MASK;
 873                         break;
 874                 case ATMEL_PIN_CONFIG_DRIVE_STRENGTH:
 875                         switch (arg) {
 876                         case ATMEL_PIO_DRVSTR_LO:
 877                         case ATMEL_PIO_DRVSTR_ME:
 878                         case ATMEL_PIO_DRVSTR_HI:
 879                                 conf &= (~ATMEL_PIO_DRVSTR_MASK);
 880                                 conf |= arg << ATMEL_PIO_DRVSTR_OFFSET;
 881                                 break;
 882                         default:
 883                                 dev_warn(pctldev->dev, "drive strength not updated (incorrect value)\n");
 884                         }
 885                         break;
 886                 default:
 887                         dev_warn(pctldev->dev,
 888                                  "unsupported configuration parameter: %u\n",
 889                                  param);
 890                         continue;
 891                 }
 892         }
 893
 894         dev_dbg(pctldev->dev, "%s: reg=0x%08x\n", __func__, conf);
 895         atmel_pin_config_write(pctldev, pin_id, conf);
 896
 897         return 0;
 898 }
 899
 900 static void atmel_conf_pin_config_dbg_show(struct pinctrl_dev *pctldev,
 901                                            struct seq_file *s,
 902                                            unsigned int pin_id)
 903 {
 904         struct atmel_pioctrl *atmel_pioctrl = pinctrl_dev_get_drvdata(pctldev);
 905         u32 conf;
 906
 907         if (!atmel_pioctrl->pins[pin_id]->device)
 908                 return;
 909
 910         if (atmel_pioctrl->pins[pin_id])
 911                 seq_printf(s, " (%s, ioset %u) ",
 912                            atmel_pioctrl->pins[pin_id]->device,
 913                            atmel_pioctrl->pins[pin_id]->ioset);
 914
 915         conf = atmel_pin_config_read(pctldev, pin_id);
 916         if (conf & ATMEL_PIO_PUEN_MASK)
 917                 seq_printf(s, "%s ", "pull-up");
 918         if (conf & ATMEL_PIO_PDEN_MASK)
 919                 seq_printf(s, "%s ", "pull-down");
 920         if (conf & ATMEL_PIO_IFEN_MASK)
 921                 seq_printf(s, "%s ", "debounce");
 922         if (conf & ATMEL_PIO_OPD_MASK)
 923                 seq_printf(s, "%s ", "open-drain");
 924         if (conf & ATMEL_PIO_SCHMITT_MASK)
 925                 seq_printf(s, "%s ", "schmitt");
 926         if (atmel_pioctrl->slew_rate_support && (conf & ATMEL_PIO_SR_MASK))
 927                 seq_printf(s, "%s ", "slew-rate");
 928         if (conf & ATMEL_PIO_DRVSTR_MASK) {
 929                 switch ((conf & ATMEL_PIO_DRVSTR_MASK) >> ATMEL_PIO_DRVSTR_OFFSET) {
 930                 case ATMEL_PIO_DRVSTR_ME:
 931                         seq_printf(s, "%s ", "medium-drive");
 932                         break;
 933                 case ATMEL_PIO_DRVSTR_HI:
 934                         seq_printf(s, "%s ", "high-drive");
 935                         break;
 936                 /* ATMEL_PIO_DRVSTR_LO and 0 which is the default value at reset */
 937                 default:
 938                         seq_printf(s, "%s ", "low-drive");
 939                 }
 940         }
 941 }
 942
 943 static const struct pinconf_ops atmel_confops = {
 944         .pin_config_group_get   = atmel_conf_pin_config_group_get,
 945         .pin_config_group_set   = atmel_conf_pin_config_group_set,
 946         .pin_config_dbg_show    = atmel_conf_pin_config_dbg_show,
 947 };
 948
 949 static struct pinctrl_desc atmel_pinctrl_desc = {
 950         .name           = "atmel_pinctrl",
 951         .confops        = &atmel_confops,
 952         .pctlops        = &atmel_pctlops,
 953         .pmxops         = &atmel_pmxops,
 954 };
 955
 956 static int __maybe_unused atmel_pctrl_suspend(struct device *dev)
 957 {
 958         struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(dev);
 959         int i, j;
 960
 961         /*
 962          * For each bank, save IMR to restore it later and disable all GPIO
 963          * interrupts excepting the ones marked as wakeup sources.
 964          */
 965         for (i = 0; i < atmel_pioctrl->nbanks; i++) {
 966                 atmel_pioctrl->pm_suspend_backup[i].imr =
 967                         atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_IMR);
 968                 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IDR,
 969                                  ~atmel_pioctrl->pm_wakeup_sources[i]);
 970                 atmel_pioctrl->pm_suspend_backup[i].odsr =
 971                         atmel_gpio_read(atmel_pioctrl, i, ATMEL_PIO_ODSR);
 972                 for (j = 0; j < ATMEL_PIO_NPINS_PER_BANK; j++) {
 973                         atmel_gpio_write(atmel_pioctrl, i,
 974                                          ATMEL_PIO_MSKR, BIT(j));
 975                         atmel_pioctrl->pm_suspend_backup[i].cfgr[j] =
 976                                 atmel_gpio_read(atmel_pioctrl, i,
 977                                                 ATMEL_PIO_CFGR);
 978                 }
 979         }
 980
 981         return 0;
 982 }
 983
 984 static int __maybe_unused atmel_pctrl_resume(struct device *dev)
 985 {
 986         struct atmel_pioctrl *atmel_pioctrl = dev_get_drvdata(dev);
 987         int i, j;
 988
 989         for (i = 0; i < atmel_pioctrl->nbanks; i++) {
 990                 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_IER,
 991                                  atmel_pioctrl->pm_suspend_backup[i].imr);
 992                 atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_SODR,
 993                                  atmel_pioctrl->pm_suspend_backup[i].odsr);
 994                 for (j = 0; j < ATMEL_PIO_NPINS_PER_BANK; j++) {
 995                         atmel_gpio_write(atmel_pioctrl, i,
 996                                          ATMEL_PIO_MSKR, BIT(j));
 997                         atmel_gpio_write(atmel_pioctrl, i, ATMEL_PIO_CFGR,
 998                                          atmel_pioctrl->pm_suspend_backup[i].cfgr[j]);
 999                 }
1000         }
1001
1002         return 0;
1003 }
1004
1005 static const struct dev_pm_ops atmel_pctrl_pm_ops = {
1006         SET_SYSTEM_SLEEP_PM_OPS(atmel_pctrl_suspend, atmel_pctrl_resume)
1007 };
1008
1009 /*
1010  * The number of banks can be different from a SoC to another one.
1011  * We can have up to 16 banks.
1012  */
1013 static const struct atmel_pioctrl_data atmel_sama5d2_pioctrl_data = {
1014         .nbanks                 = 4,
1015         .last_bank_count        = ATMEL_PIO_NPINS_PER_BANK,
1016 };
1017
1018 static const struct atmel_pioctrl_data microchip_sama7g5_pioctrl_data = {
1019         .nbanks                 = 5,
1020         .last_bank_count        = 8, /* sama7g5 has only PE0 to PE7 */
1021         .slew_rate_support      = 1,
1022 };
1023
1024 static const struct of_device_id atmel_pctrl_of_match[] = {
1025         {
1026                 .compatible = "atmel,sama5d2-pinctrl",
1027                 .data = &atmel_sama5d2_pioctrl_data,
1028         }, {
1029                 .compatible = "microchip,sama7g5-pinctrl",
1030                 .data = &microchip_sama7g5_pioctrl_data,
1031         }, {
1032                 /* sentinel */
1033         }
1034 };
1035
1036 static int atmel_pinctrl_probe(struct platform_device *pdev)
1037 {
1038         struct device *dev = &pdev->dev;
1039         struct pinctrl_pin_desc *pin_desc;
1040         const char **group_names;
1041         const struct of_device_id *match;
1042         int i, ret;
1043         struct atmel_pioctrl *atmel_pioctrl;
1044         const struct atmel_pioctrl_data *atmel_pioctrl_data;
1045
1046         atmel_pioctrl = devm_kzalloc(dev, sizeof(*atmel_pioctrl), GFP_KERNEL);
1047         if (!atmel_pioctrl)
1048                 return -ENOMEM;
1049         atmel_pioctrl->dev = dev;
1050         atmel_pioctrl->node = dev->of_node;
1051         platform_set_drvdata(pdev, atmel_pioctrl);
1052
1053         match = of_match_node(atmel_pctrl_of_match, dev->of_node);
1054         if (!match) {
1055                 dev_err(dev, "unknown compatible string\n");
1056                 return -ENODEV;
1057         }
1058         atmel_pioctrl_data = match->data;
1059         atmel_pioctrl->nbanks = atmel_pioctrl_data->nbanks;
1060         atmel_pioctrl->npins = atmel_pioctrl->nbanks * ATMEL_PIO_NPINS_PER_BANK;
1061         /* if last bank has limited number of pins, adjust accordingly */
1062         if (atmel_pioctrl_data->last_bank_count != ATMEL_PIO_NPINS_PER_BANK) {
1063                 atmel_pioctrl->npins -= ATMEL_PIO_NPINS_PER_BANK;
1064                 atmel_pioctrl->npins += atmel_pioctrl_data->last_bank_count;
1065         }
1066         atmel_pioctrl->slew_rate_support = atmel_pioctrl_data->slew_rate_support;
1067
1068         atmel_pioctrl->reg_base = devm_platform_ioremap_resource(pdev, 0);
1069         if (IS_ERR(atmel_pioctrl->reg_base))
1070                 return PTR_ERR(atmel_pioctrl->reg_base);
1071
1072         atmel_pioctrl->clk = devm_clk_get(dev, NULL);
1073         if (IS_ERR(atmel_pioctrl->clk)) {
1074                 dev_err(dev, "failed to get clock\n");
1075                 return PTR_ERR(atmel_pioctrl->clk);
1076         }
1077
1078         atmel_pioctrl->pins = devm_kcalloc(dev,
1079                                            atmel_pioctrl->npins,
1080                                            sizeof(*atmel_pioctrl->pins),
1081                                            GFP_KERNEL);
1082         if (!atmel_pioctrl->pins)
1083                 return -ENOMEM;
1084
1085         pin_desc = devm_kcalloc(dev, atmel_pioctrl->npins, sizeof(*pin_desc),
1086                                 GFP_KERNEL);
1087         if (!pin_desc)
1088                 return -ENOMEM;
1089         atmel_pinctrl_desc.pins = pin_desc;
1090         atmel_pinctrl_desc.npins = atmel_pioctrl->npins;
1091         atmel_pinctrl_desc.num_custom_params = ARRAY_SIZE(atmel_custom_bindings);
1092         atmel_pinctrl_desc.custom_params = atmel_custom_bindings;
1093
1094         /* One pin is one group since a pin can achieve all functions. */
1095         group_names = devm_kcalloc(dev,
1096                                    atmel_pioctrl->npins, sizeof(*group_names),
1097                                    GFP_KERNEL);
1098         if (!group_names)
1099                 return -ENOMEM;
1100         atmel_pioctrl->group_names = group_names;
1101
1102         atmel_pioctrl->groups = devm_kcalloc(&pdev->dev,
1103                         atmel_pioctrl->npins, sizeof(*atmel_pioctrl->groups),
1104                         GFP_KERNEL);
1105         if (!atmel_pioctrl->groups)
1106                 return -ENOMEM;
1107         for (i = 0 ; i < atmel_pioctrl->npins; i++) {
1108                 struct atmel_group *group = atmel_pioctrl->groups + i;
1109                 unsigned int bank = ATMEL_PIO_BANK(i);
1110                 unsigned int line = ATMEL_PIO_LINE(i);
1111
1112                 atmel_pioctrl->pins[i] = devm_kzalloc(dev,
1113                                 sizeof(**atmel_pioctrl->pins), GFP_KERNEL);
1114                 if (!atmel_pioctrl->pins[i])
1115                         return -ENOMEM;
1116
1117                 atmel_pioctrl->pins[i]->pin_id = i;
1118                 atmel_pioctrl->pins[i]->bank = bank;
1119                 atmel_pioctrl->pins[i]->line = line;
1120
1121                 pin_desc[i].number = i;
1122                 /* Pin naming convention: P(bank_name)(bank_pin_number). */
1123                 pin_desc[i].name = kasprintf(GFP_KERNEL, "P%c%d",
1124                                              bank + 'A', line);
1125
1126                 group->name = group_names[i] = pin_desc[i].name;
1127                 group->pin = pin_desc[i].number;
1128
1129                 dev_dbg(dev, "pin_id=%u, bank=%u, line=%u", i, bank, line);
1130         }
1131
1132         atmel_pioctrl->gpio_chip = &atmel_gpio_chip;
1133         atmel_pioctrl->gpio_chip->ngpio = atmel_pioctrl->npins;
1134         atmel_pioctrl->gpio_chip->label = dev_name(dev);
1135         atmel_pioctrl->gpio_chip->parent = dev;
1136         atmel_pioctrl->gpio_chip->names = atmel_pioctrl->group_names;
1137
1138         atmel_pioctrl->pm_wakeup_sources = devm_kcalloc(dev,
1139                         atmel_pioctrl->nbanks,
1140                         sizeof(*atmel_pioctrl->pm_wakeup_sources),
1141                         GFP_KERNEL);
1142         if (!atmel_pioctrl->pm_wakeup_sources)
1143                 return -ENOMEM;
1144
1145         atmel_pioctrl->pm_suspend_backup = devm_kcalloc(dev,
1146                         atmel_pioctrl->nbanks,
1147                         sizeof(*atmel_pioctrl->pm_suspend_backup),
1148                         GFP_KERNEL);
1149         if (!atmel_pioctrl->pm_suspend_backup)
1150                 return -ENOMEM;
1151
1152         atmel_pioctrl->irqs = devm_kcalloc(dev,
1153                                            atmel_pioctrl->nbanks,
1154                                            sizeof(*atmel_pioctrl->irqs),
1155                                            GFP_KERNEL);
1156         if (!atmel_pioctrl->irqs)
1157                 return -ENOMEM;
1158
1159         /* There is one controller but each bank has its own irq line. */
1160         for (i = 0; i < atmel_pioctrl->nbanks; i++) {
1161                 ret = platform_get_irq(pdev, i);
1162                 if (ret < 0) {
1163                         dev_dbg(dev, "missing irq resource for group %c\n",
1164                                 'A' + i);
1165                         return ret;
1166                 }
1167                 atmel_pioctrl->irqs[i] = ret;
1168                 irq_set_chained_handler_and_data(ret, atmel_gpio_irq_handler, atmel_pioctrl);
1169                 dev_dbg(dev, "bank %i: irq=%d\n", i, ret);
1170         }
1171
1172         atmel_pioctrl->irq_domain = irq_domain_add_linear(dev->of_node,
1173                         atmel_pioctrl->gpio_chip->ngpio,
1174                         &irq_domain_simple_ops, NULL);
1175         if (!atmel_pioctrl->irq_domain) {
1176                 dev_err(dev, "can't add the irq domain\n");
1177                 return -ENODEV;
1178         }
1179         atmel_pioctrl->irq_domain->name = "atmel gpio";
1180
1181         for (i = 0; i < atmel_pioctrl->npins; i++) {
1182                 int irq = irq_create_mapping(atmel_pioctrl->irq_domain, i);
1183
1184                 irq_set_chip_and_handler(irq, &atmel_gpio_irq_chip,
1185                                          handle_simple_irq);
1186                 irq_set_chip_data(irq, atmel_pioctrl);
1187                 dev_dbg(dev,
1188                         "atmel gpio irq domain: hwirq: %d, linux irq: %d\n",
1189                         i, irq);
1190         }
1191
1192         ret = clk_prepare_enable(atmel_pioctrl->clk);
1193         if (ret) {
1194                 dev_err(dev, "failed to prepare and enable clock\n");
1195                 goto clk_prepare_enable_error;
1196         }
1197
1198         atmel_pioctrl->pinctrl_dev = devm_pinctrl_register(&pdev->dev,
1199                                                            &atmel_pinctrl_desc,
1200                                                            atmel_pioctrl);
1201         if (IS_ERR(atmel_pioctrl->pinctrl_dev)) {
1202                 ret = PTR_ERR(atmel_pioctrl->pinctrl_dev);
1203                 dev_err(dev, "pinctrl registration failed\n");
1204                 goto clk_unprep;
1205         }
1206
1207         ret = gpiochip_add_data(atmel_pioctrl->gpio_chip, atmel_pioctrl);
1208         if (ret) {
1209                 dev_err(dev, "failed to add gpiochip\n");
1210                 goto clk_unprep;
1211         }
1212
1213         ret = gpiochip_add_pin_range(atmel_pioctrl->gpio_chip, dev_name(dev),
1214                                      0, 0, atmel_pioctrl->gpio_chip->ngpio);
1215         if (ret) {
1216                 dev_err(dev, "failed to add gpio pin range\n");
1217                 goto gpiochip_add_pin_range_error;
1218         }
1219
1220         dev_info(&pdev->dev, "atmel pinctrl initialized\n");
1221
1222         return 0;
1223
1224 gpiochip_add_pin_range_error:
1225         gpiochip_remove(atmel_pioctrl->gpio_chip);
1226
1227 clk_unprep:
1228         clk_disable_unprepare(atmel_pioctrl->clk);
1229
1230 clk_prepare_enable_error:
1231         irq_domain_remove(atmel_pioctrl->irq_domain);
1232
1233         return ret;
1234 }
1235
1236 static struct platform_driver atmel_pinctrl_driver = {
1237         .driver = {
1238                 .name = "pinctrl-at91-pio4",
1239                 .of_match_table = atmel_pctrl_of_match,
1240                 .pm = &atmel_pctrl_pm_ops,
1241                 .suppress_bind_attrs = true,
1242         },
1243         .probe = atmel_pinctrl_probe,
1244 };
1245 builtin_platform_driver(atmel_pinctrl_driver);