root/drivers/pinctrl/pinctrl-coh901.c

DEFINITIONS

1. u300_gpio_get
2. u300_gpio_set
3. u300_gpio_direction_input
4. u300_gpio_direction_output
5. u300_gpio_config_get
6. u300_gpio_config_set
7. u300_toggle_trigger
8. u300_gpio_irq_type
9. u300_gpio_irq_enable
10. u300_gpio_irq_disable
11. u300_gpio_irq_handler
12. u300_gpio_init_pin
13. u300_gpio_init_coh901571
14. u300_gpio_probe
15. u300_gpio_remove
16. u300_gpio_init
17. u300_gpio_exit

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * U300 GPIO module.
   4  *
   5  * Copyright (C) 2007-2012 ST-Ericsson AB
   6  * COH 901 571/3 - Used in DB3210 (U365 2.0) and DB3350 (U335 1.0)
   7  * Author: Linus Walleij <linus.walleij@linaro.org>
   8  * Author: Jonas Aaberg <jonas.aberg@stericsson.com>
   9  */
  10 #include <linux/module.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/delay.h>
  13 #include <linux/errno.h>
  14 #include <linux/io.h>
  15 #include <linux/clk.h>
  16 #include <linux/err.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/gpio/driver.h>
  19 #include <linux/slab.h>
  20 #include <linux/pinctrl/consumer.h>
  21 #include <linux/pinctrl/pinconf-generic.h>
  22 #include "pinctrl-coh901.h"
  23 
  24 #define U300_GPIO_PORT_STRIDE                           (0x30)
  25 /*
  26  * Control Register 32bit (R/W)
  27  * bit 15-9 (mask 0x0000FE00) contains the number of cores. 8*cores
  28  * gives the number of GPIO pins.
  29  * bit 8-2  (mask 0x000001FC) contains the core version ID.
  30  */
  31 #define U300_GPIO_CR                                    (0x00)
  32 #define U300_GPIO_CR_SYNC_SEL_ENABLE                    (0x00000002UL)
  33 #define U300_GPIO_CR_BLOCK_CLKRQ_ENABLE                 (0x00000001UL)
  34 #define U300_GPIO_PXPDIR                                (0x04)
  35 #define U300_GPIO_PXPDOR                                (0x08)
  36 #define U300_GPIO_PXPCR                                 (0x0C)
  37 #define U300_GPIO_PXPCR_ALL_PINS_MODE_MASK              (0x0000FFFFUL)
  38 #define U300_GPIO_PXPCR_PIN_MODE_MASK                   (0x00000003UL)
  39 #define U300_GPIO_PXPCR_PIN_MODE_SHIFT                  (0x00000002UL)
  40 #define U300_GPIO_PXPCR_PIN_MODE_INPUT                  (0x00000000UL)
  41 #define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL       (0x00000001UL)
  42 #define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN      (0x00000002UL)
  43 #define U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE     (0x00000003UL)
  44 #define U300_GPIO_PXPER                                 (0x10)
  45 #define U300_GPIO_PXPER_ALL_PULL_UP_DISABLE_MASK        (0x000000FFUL)
  46 #define U300_GPIO_PXPER_PULL_UP_DISABLE                 (0x00000001UL)
  47 #define U300_GPIO_PXIEV                                 (0x14)
  48 #define U300_GPIO_PXIEN                                 (0x18)
  49 #define U300_GPIO_PXIFR                                 (0x1C)
  50 #define U300_GPIO_PXICR                                 (0x20)
  51 #define U300_GPIO_PXICR_ALL_IRQ_CONFIG_MASK             (0x000000FFUL)
  52 #define U300_GPIO_PXICR_IRQ_CONFIG_MASK                 (0x00000001UL)
  53 #define U300_GPIO_PXICR_IRQ_CONFIG_FALLING_EDGE         (0x00000000UL)
  54 #define U300_GPIO_PXICR_IRQ_CONFIG_RISING_EDGE          (0x00000001UL)
  55 
  56 /* 8 bits per port, no version has more than 7 ports */
  57 #define U300_GPIO_NUM_PORTS 7
  58 #define U300_GPIO_PINS_PER_PORT 8
  59 #define U300_GPIO_MAX (U300_GPIO_PINS_PER_PORT * U300_GPIO_NUM_PORTS)
  60 
  61 struct u300_gpio_port {
  62         struct u300_gpio *gpio;
  63         char name[8];
  64         int irq;
  65         int number;
  66         u8 toggle_edge_mode;
  67 };
  68 
  69 struct u300_gpio {
  70         struct gpio_chip chip;
  71         struct u300_gpio_port ports[U300_GPIO_NUM_PORTS];
  72         struct clk *clk;
  73         void __iomem *base;
  74         struct device *dev;
  75         u32 stride;
  76         /* Register offsets */
  77         u32 pcr;
  78         u32 dor;
  79         u32 dir;
  80         u32 per;
  81         u32 icr;
  82         u32 ien;
  83         u32 iev;
  84 };
  85 
  86 /*
  87  * Macro to expand to read a specific register found in the "gpio"
  88  * struct. It requires the struct u300_gpio *gpio variable to exist in
  89  * its context. It calculates the port offset from the given pin
  90  * offset, muliplies by the port stride and adds the register offset
  91  * so it provides a pointer to the desired register.
  92  */
  93 #define U300_PIN_REG(pin, reg) \
  94         (gpio->base + (pin >> 3) * gpio->stride + gpio->reg)
  95 
  96 /*
  97  * Provides a bitmask for a specific gpio pin inside an 8-bit GPIO
  98  * register.
  99  */
 100 #define U300_PIN_BIT(pin) \
 101         (1 << (pin & 0x07))
 102 
 103 struct u300_gpio_confdata {
 104         u16 bias_mode;
 105         bool output;
 106         int outval;
 107 };
 108 
 109 #define U300_FLOATING_INPUT { \
 110         .bias_mode = PIN_CONFIG_BIAS_HIGH_IMPEDANCE, \
 111         .output = false, \
 112 }
 113 
 114 #define U300_PULL_UP_INPUT { \
 115         .bias_mode = PIN_CONFIG_BIAS_PULL_UP, \
 116         .output = false, \
 117 }
 118 
 119 #define U300_OUTPUT_LOW { \
 120         .output = true, \
 121         .outval = 0, \
 122 }
 123 
 124 #define U300_OUTPUT_HIGH { \
 125         .output = true, \
 126         .outval = 1, \
 127 }
 128 
 129 /* Initial configuration */
 130 static const struct u300_gpio_confdata __initconst
 131 bs335_gpio_config[U300_GPIO_NUM_PORTS][U300_GPIO_PINS_PER_PORT] = {
 132         /* Port 0, pins 0-7 */
 133         {
 134                 U300_FLOATING_INPUT,
 135                 U300_OUTPUT_HIGH,
 136                 U300_FLOATING_INPUT,
 137                 U300_OUTPUT_LOW,
 138                 U300_OUTPUT_LOW,
 139                 U300_OUTPUT_LOW,
 140                 U300_OUTPUT_LOW,
 141                 U300_OUTPUT_LOW,
 142         },
 143         /* Port 1, pins 0-7 */
 144         {
 145                 U300_OUTPUT_LOW,
 146                 U300_OUTPUT_LOW,
 147                 U300_OUTPUT_LOW,
 148                 U300_PULL_UP_INPUT,
 149                 U300_FLOATING_INPUT,
 150                 U300_OUTPUT_HIGH,
 151                 U300_OUTPUT_LOW,
 152                 U300_OUTPUT_LOW,
 153         },
 154         /* Port 2, pins 0-7 */
 155         {
 156                 U300_FLOATING_INPUT,
 157                 U300_FLOATING_INPUT,
 158                 U300_FLOATING_INPUT,
 159                 U300_FLOATING_INPUT,
 160                 U300_OUTPUT_LOW,
 161                 U300_PULL_UP_INPUT,
 162                 U300_OUTPUT_LOW,
 163                 U300_PULL_UP_INPUT,
 164         },
 165         /* Port 3, pins 0-7 */
 166         {
 167                 U300_PULL_UP_INPUT,
 168                 U300_OUTPUT_LOW,
 169                 U300_FLOATING_INPUT,
 170                 U300_FLOATING_INPUT,
 171                 U300_FLOATING_INPUT,
 172                 U300_FLOATING_INPUT,
 173                 U300_FLOATING_INPUT,
 174                 U300_FLOATING_INPUT,
 175         },
 176         /* Port 4, pins 0-7 */
 177         {
 178                 U300_FLOATING_INPUT,
 179                 U300_FLOATING_INPUT,
 180                 U300_FLOATING_INPUT,
 181                 U300_FLOATING_INPUT,
 182                 U300_FLOATING_INPUT,
 183                 U300_FLOATING_INPUT,
 184                 U300_FLOATING_INPUT,
 185                 U300_FLOATING_INPUT,
 186         },
 187         /* Port 5, pins 0-7 */
 188         {
 189                 U300_FLOATING_INPUT,
 190                 U300_FLOATING_INPUT,
 191                 U300_FLOATING_INPUT,
 192                 U300_FLOATING_INPUT,
 193                 U300_FLOATING_INPUT,
 194                 U300_FLOATING_INPUT,
 195                 U300_FLOATING_INPUT,
 196                 U300_FLOATING_INPUT,
 197         },
 198         /* Port 6, pind 0-7 */
 199         {
 200                 U300_FLOATING_INPUT,
 201                 U300_FLOATING_INPUT,
 202                 U300_FLOATING_INPUT,
 203                 U300_FLOATING_INPUT,
 204                 U300_FLOATING_INPUT,
 205                 U300_FLOATING_INPUT,
 206                 U300_FLOATING_INPUT,
 207                 U300_FLOATING_INPUT,
 208         }
 209 };
 210 
 211 static int u300_gpio_get(struct gpio_chip *chip, unsigned offset)
 212 {
 213         struct u300_gpio *gpio = gpiochip_get_data(chip);
 214 
 215         return !!(readl(U300_PIN_REG(offset, dir)) & U300_PIN_BIT(offset));
 216 }
 217 
 218 static void u300_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
 219 {
 220         struct u300_gpio *gpio = gpiochip_get_data(chip);
 221         unsigned long flags;
 222         u32 val;
 223 
 224         local_irq_save(flags);
 225 
 226         val = readl(U300_PIN_REG(offset, dor));
 227         if (value)
 228                 writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, dor));
 229         else
 230                 writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, dor));
 231 
 232         local_irq_restore(flags);
 233 }
 234 
 235 static int u300_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
 236 {
 237         struct u300_gpio *gpio = gpiochip_get_data(chip);
 238         unsigned long flags;
 239         u32 val;
 240 
 241         local_irq_save(flags);
 242         val = readl(U300_PIN_REG(offset, pcr));
 243         /* Mask out this pin, note 2 bits per setting */
 244         val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1));
 245         writel(val, U300_PIN_REG(offset, pcr));
 246         local_irq_restore(flags);
 247         return 0;
 248 }
 249 
 250 static int u300_gpio_direction_output(struct gpio_chip *chip, unsigned offset,
 251                                       int value)
 252 {
 253         struct u300_gpio *gpio = gpiochip_get_data(chip);
 254         unsigned long flags;
 255         u32 oldmode;
 256         u32 val;
 257 
 258         local_irq_save(flags);
 259         val = readl(U300_PIN_REG(offset, pcr));
 260         /*
 261          * Drive mode must be set by the special mode set function, set
 262          * push/pull mode by default if no mode has been selected.
 263          */
 264         oldmode = val & (U300_GPIO_PXPCR_PIN_MODE_MASK <<
 265                          ((offset & 0x07) << 1));
 266         /* mode = 0 means input, else some mode is already set */
 267         if (oldmode == 0) {
 268                 val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK <<
 269                          ((offset & 0x07) << 1));
 270                 val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL
 271                         << ((offset & 0x07) << 1));
 272                 writel(val, U300_PIN_REG(offset, pcr));
 273         }
 274         u300_gpio_set(chip, offset, value);
 275         local_irq_restore(flags);
 276         return 0;
 277 }
 278 
 279 /* Returning -EINVAL means "supported but not available" */
 280 int u300_gpio_config_get(struct gpio_chip *chip,
 281                          unsigned offset,
 282                          unsigned long *config)
 283 {
 284         struct u300_gpio *gpio = gpiochip_get_data(chip);
 285         enum pin_config_param param = (enum pin_config_param) *config;
 286         bool biasmode;
 287         u32 drmode;
 288 
 289         /* One bit per pin, clamp to bool range */
 290         biasmode = !!(readl(U300_PIN_REG(offset, per)) & U300_PIN_BIT(offset));
 291 
 292         /* Mask out the two bits for this pin and shift to bits 0,1 */
 293         drmode = readl(U300_PIN_REG(offset, pcr));
 294         drmode &= (U300_GPIO_PXPCR_PIN_MODE_MASK << ((offset & 0x07) << 1));
 295         drmode >>= ((offset & 0x07) << 1);
 296 
 297         switch (param) {
 298         case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
 299                 *config = 0;
 300                 if (biasmode)
 301                         return 0;
 302                 else
 303                         return -EINVAL;
 304                 break;
 305         case PIN_CONFIG_BIAS_PULL_UP:
 306                 *config = 0;
 307                 if (!biasmode)
 308                         return 0;
 309                 else
 310                         return -EINVAL;
 311                 break;
 312         case PIN_CONFIG_DRIVE_PUSH_PULL:
 313                 *config = 0;
 314                 if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL)
 315                         return 0;
 316                 else
 317                         return -EINVAL;
 318                 break;
 319         case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 320                 *config = 0;
 321                 if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN)
 322                         return 0;
 323                 else
 324                         return -EINVAL;
 325                 break;
 326         case PIN_CONFIG_DRIVE_OPEN_SOURCE:
 327                 *config = 0;
 328                 if (drmode == U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE)
 329                         return 0;
 330                 else
 331                         return -EINVAL;
 332                 break;
 333         default:
 334                 break;
 335         }
 336         return -ENOTSUPP;
 337 }
 338 
 339 int u300_gpio_config_set(struct gpio_chip *chip, unsigned offset,
 340                          enum pin_config_param param)
 341 {
 342         struct u300_gpio *gpio = gpiochip_get_data(chip);
 343         unsigned long flags;
 344         u32 val;
 345 
 346         local_irq_save(flags);
 347         switch (param) {
 348         case PIN_CONFIG_BIAS_DISABLE:
 349         case PIN_CONFIG_BIAS_HIGH_IMPEDANCE:
 350                 val = readl(U300_PIN_REG(offset, per));
 351                 writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, per));
 352                 break;
 353         case PIN_CONFIG_BIAS_PULL_UP:
 354                 val = readl(U300_PIN_REG(offset, per));
 355                 writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, per));
 356                 break;
 357         case PIN_CONFIG_DRIVE_PUSH_PULL:
 358                 val = readl(U300_PIN_REG(offset, pcr));
 359                 val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK
 360                          << ((offset & 0x07) << 1));
 361                 val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL
 362                         << ((offset & 0x07) << 1));
 363                 writel(val, U300_PIN_REG(offset, pcr));
 364                 break;
 365         case PIN_CONFIG_DRIVE_OPEN_DRAIN:
 366                 val = readl(U300_PIN_REG(offset, pcr));
 367                 val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK
 368                          << ((offset & 0x07) << 1));
 369                 val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_DRAIN
 370                         << ((offset & 0x07) << 1));
 371                 writel(val, U300_PIN_REG(offset, pcr));
 372                 break;
 373         case PIN_CONFIG_DRIVE_OPEN_SOURCE:
 374                 val = readl(U300_PIN_REG(offset, pcr));
 375                 val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK
 376                          << ((offset & 0x07) << 1));
 377                 val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_OPEN_SOURCE
 378                         << ((offset & 0x07) << 1));
 379                 writel(val, U300_PIN_REG(offset, pcr));
 380                 break;
 381         default:
 382                 local_irq_restore(flags);
 383                 dev_err(gpio->dev, "illegal configuration requested\n");
 384                 return -EINVAL;
 385         }
 386         local_irq_restore(flags);
 387         return 0;
 388 }
 389 
 390 static const struct gpio_chip u300_gpio_chip = {
 391         .label                  = "u300-gpio-chip",
 392         .owner                  = THIS_MODULE,
 393         .request                = gpiochip_generic_request,
 394         .free                   = gpiochip_generic_free,
 395         .get                    = u300_gpio_get,
 396         .set                    = u300_gpio_set,
 397         .direction_input        = u300_gpio_direction_input,
 398         .direction_output       = u300_gpio_direction_output,
 399 };
 400 
 401 static void u300_toggle_trigger(struct u300_gpio *gpio, unsigned offset)
 402 {
 403         u32 val;
 404 
 405         val = readl(U300_PIN_REG(offset, icr));
 406         /* Set mode depending on state */
 407         if (u300_gpio_get(&gpio->chip, offset)) {
 408                 /* High now, let's trigger on falling edge next then */
 409                 writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
 410                 dev_dbg(gpio->dev, "next IRQ on falling edge on pin %d\n",
 411                         offset);
 412         } else {
 413                 /* Low now, let's trigger on rising edge next then */
 414                 writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
 415                 dev_dbg(gpio->dev, "next IRQ on rising edge on pin %d\n",
 416                         offset);
 417         }
 418 }
 419 
 420 static int u300_gpio_irq_type(struct irq_data *d, unsigned trigger)
 421 {
 422         struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
 423         struct u300_gpio *gpio = gpiochip_get_data(chip);
 424         struct u300_gpio_port *port = &gpio->ports[d->hwirq >> 3];
 425         int offset = d->hwirq;
 426         u32 val;
 427 
 428         if ((trigger & IRQF_TRIGGER_RISING) &&
 429             (trigger & IRQF_TRIGGER_FALLING)) {
 430                 /*
 431                  * The GPIO block can only trigger on falling OR rising edges,
 432                  * not both. So we need to toggle the mode whenever the pin
 433                  * goes from one state to the other with a special state flag
 434                  */
 435                 dev_dbg(gpio->dev,
 436                         "trigger on both rising and falling edge on pin %d\n",
 437                         offset);
 438                 port->toggle_edge_mode |= U300_PIN_BIT(offset);
 439                 u300_toggle_trigger(gpio, offset);
 440         } else if (trigger & IRQF_TRIGGER_RISING) {
 441                 dev_dbg(gpio->dev, "trigger on rising edge on pin %d\n",
 442                         offset);
 443                 val = readl(U300_PIN_REG(offset, icr));
 444                 writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
 445                 port->toggle_edge_mode &= ~U300_PIN_BIT(offset);
 446         } else if (trigger & IRQF_TRIGGER_FALLING) {
 447                 dev_dbg(gpio->dev, "trigger on falling edge on pin %d\n",
 448                         offset);
 449                 val = readl(U300_PIN_REG(offset, icr));
 450                 writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, icr));
 451                 port->toggle_edge_mode &= ~U300_PIN_BIT(offset);
 452         }
 453 
 454         return 0;
 455 }
 456 
 457 static void u300_gpio_irq_enable(struct irq_data *d)
 458 {
 459         struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
 460         struct u300_gpio *gpio = gpiochip_get_data(chip);
 461         struct u300_gpio_port *port = &gpio->ports[d->hwirq >> 3];
 462         int offset = d->hwirq;
 463         u32 val;
 464         unsigned long flags;
 465 
 466         dev_dbg(gpio->dev, "enable IRQ for hwirq %lu on port %s, offset %d\n",
 467                  d->hwirq, port->name, offset);
 468         local_irq_save(flags);
 469         val = readl(U300_PIN_REG(offset, ien));
 470         writel(val | U300_PIN_BIT(offset), U300_PIN_REG(offset, ien));
 471         local_irq_restore(flags);
 472 }
 473 
 474 static void u300_gpio_irq_disable(struct irq_data *d)
 475 {
 476         struct gpio_chip *chip = irq_data_get_irq_chip_data(d);
 477         struct u300_gpio *gpio = gpiochip_get_data(chip);
 478         int offset = d->hwirq;
 479         u32 val;
 480         unsigned long flags;
 481 
 482         local_irq_save(flags);
 483         val = readl(U300_PIN_REG(offset, ien));
 484         writel(val & ~U300_PIN_BIT(offset), U300_PIN_REG(offset, ien));
 485         local_irq_restore(flags);
 486 }
 487 
 488 static struct irq_chip u300_gpio_irqchip = {
 489         .name                   = "u300-gpio-irqchip",
 490         .irq_enable             = u300_gpio_irq_enable,
 491         .irq_disable            = u300_gpio_irq_disable,
 492         .irq_set_type           = u300_gpio_irq_type,
 493 };
 494 
 495 static void u300_gpio_irq_handler(struct irq_desc *desc)
 496 {
 497         unsigned int irq = irq_desc_get_irq(desc);
 498         struct irq_chip *parent_chip = irq_desc_get_chip(desc);
 499         struct gpio_chip *chip = irq_desc_get_handler_data(desc);
 500         struct u300_gpio *gpio = gpiochip_get_data(chip);
 501         struct u300_gpio_port *port = &gpio->ports[irq - chip->base];
 502         int pinoffset = port->number << 3; /* get the right stride */
 503         unsigned long val;
 504 
 505         chained_irq_enter(parent_chip, desc);
 506 
 507         /* Read event register */
 508         val = readl(U300_PIN_REG(pinoffset, iev));
 509         /* Mask relevant bits */
 510         val &= 0xFFU; /* 8 bits per port */
 511         /* ACK IRQ (clear event) */
 512         writel(val, U300_PIN_REG(pinoffset, iev));
 513 
 514         /* Call IRQ handler */
 515         if (val != 0) {
 516                 int irqoffset;
 517 
 518                 for_each_set_bit(irqoffset, &val, U300_GPIO_PINS_PER_PORT) {
 519                         int offset = pinoffset + irqoffset;
 520                         int pin_irq = irq_find_mapping(chip->irq.domain, offset);
 521 
 522                         dev_dbg(gpio->dev, "GPIO IRQ %d on pin %d\n",
 523                                 pin_irq, offset);
 524                         generic_handle_irq(pin_irq);
 525                         /*
 526                          * Triggering IRQ on both rising and falling edge
 527                          * needs mockery
 528                          */
 529                         if (port->toggle_edge_mode & U300_PIN_BIT(offset))
 530                                 u300_toggle_trigger(gpio, offset);
 531                 }
 532         }
 533 
 534         chained_irq_exit(parent_chip, desc);
 535 }
 536 
 537 static void __init u300_gpio_init_pin(struct u300_gpio *gpio,
 538                                       int offset,
 539                                       const struct u300_gpio_confdata *conf)
 540 {
 541         /* Set mode: input or output */
 542         if (conf->output) {
 543                 u300_gpio_direction_output(&gpio->chip, offset, conf->outval);
 544 
 545                 /* Deactivate bias mode for output */
 546                 u300_gpio_config_set(&gpio->chip, offset,
 547                                      PIN_CONFIG_BIAS_HIGH_IMPEDANCE);
 548 
 549                 /* Set drive mode for output */
 550                 u300_gpio_config_set(&gpio->chip, offset,
 551                                      PIN_CONFIG_DRIVE_PUSH_PULL);
 552 
 553                 dev_dbg(gpio->dev, "set up pin %d as output, value: %d\n",
 554                         offset, conf->outval);
 555         } else {
 556                 u300_gpio_direction_input(&gpio->chip, offset);
 557 
 558                 /* Always set output low on input pins */
 559                 u300_gpio_set(&gpio->chip, offset, 0);
 560 
 561                 /* Set bias mode for input */
 562                 u300_gpio_config_set(&gpio->chip, offset, conf->bias_mode);
 563 
 564                 dev_dbg(gpio->dev, "set up pin %d as input, bias: %04x\n",
 565                         offset, conf->bias_mode);
 566         }
 567 }
 568 
 569 static void __init u300_gpio_init_coh901571(struct u300_gpio *gpio)
 570 {
 571         int i, j;
 572 
 573         /* Write default config and values to all pins */
 574         for (i = 0; i < U300_GPIO_NUM_PORTS; i++) {
 575                 for (j = 0; j < 8; j++) {
 576                         const struct u300_gpio_confdata *conf;
 577                         int offset = (i*8) + j;
 578 
 579                         conf = &bs335_gpio_config[i][j];
 580                         u300_gpio_init_pin(gpio, offset, conf);
 581                 }
 582         }
 583 }
 584 
 585 /*
 586  * Here we map a GPIO in the local gpio_chip pin space to a pin in
 587  * the local pinctrl pin space. The pin controller used is
 588  * pinctrl-u300.
 589  */
 590 struct coh901_pinpair {
 591         unsigned int offset;
 592         unsigned int pin_base;
 593 };
 594 
 595 #define COH901_PINRANGE(a, b) { .offset = a, .pin_base = b }
 596 
 597 static struct coh901_pinpair coh901_pintable[] = {
 598         COH901_PINRANGE(10, 426),
 599         COH901_PINRANGE(11, 180),
 600         COH901_PINRANGE(12, 165), /* MS/MMC card insertion */
 601         COH901_PINRANGE(13, 179),
 602         COH901_PINRANGE(14, 178),
 603         COH901_PINRANGE(16, 194),
 604         COH901_PINRANGE(17, 193),
 605         COH901_PINRANGE(18, 192),
 606         COH901_PINRANGE(19, 191),
 607         COH901_PINRANGE(20, 186),
 608         COH901_PINRANGE(21, 185),
 609         COH901_PINRANGE(22, 184),
 610         COH901_PINRANGE(23, 183),
 611         COH901_PINRANGE(24, 182),
 612         COH901_PINRANGE(25, 181),
 613 };
 614 
 615 static int __init u300_gpio_probe(struct platform_device *pdev)
 616 {
 617         struct u300_gpio *gpio;
 618         struct resource *memres;
 619         int err = 0;
 620         int portno;
 621         u32 val;
 622         u32 ifr;
 623         int i;
 624 
 625         gpio = devm_kzalloc(&pdev->dev, sizeof(struct u300_gpio), GFP_KERNEL);
 626         if (gpio == NULL)
 627                 return -ENOMEM;
 628 
 629         gpio->chip = u300_gpio_chip;
 630         gpio->chip.ngpio = U300_GPIO_NUM_PORTS * U300_GPIO_PINS_PER_PORT;
 631         gpio->chip.parent = &pdev->dev;
 632         gpio->chip.base = 0;
 633         gpio->dev = &pdev->dev;
 634 
 635         memres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 636         gpio->base = devm_ioremap_resource(&pdev->dev, memres);
 637         if (IS_ERR(gpio->base))
 638                 return PTR_ERR(gpio->base);
 639 
 640         gpio->clk = devm_clk_get(gpio->dev, NULL);
 641         if (IS_ERR(gpio->clk)) {
 642                 err = PTR_ERR(gpio->clk);
 643                 dev_err(gpio->dev, "could not get GPIO clock\n");
 644                 return err;
 645         }
 646 
 647         err = clk_prepare_enable(gpio->clk);
 648         if (err) {
 649                 dev_err(gpio->dev, "could not enable GPIO clock\n");
 650                 return err;
 651         }
 652 
 653         dev_info(gpio->dev,
 654                  "initializing GPIO Controller COH 901 571/3\n");
 655         gpio->stride = U300_GPIO_PORT_STRIDE;
 656         gpio->pcr = U300_GPIO_PXPCR;
 657         gpio->dor = U300_GPIO_PXPDOR;
 658         gpio->dir = U300_GPIO_PXPDIR;
 659         gpio->per = U300_GPIO_PXPER;
 660         gpio->icr = U300_GPIO_PXICR;
 661         gpio->ien = U300_GPIO_PXIEN;
 662         gpio->iev = U300_GPIO_PXIEV;
 663         ifr = U300_GPIO_PXIFR;
 664 
 665         val = readl(gpio->base + U300_GPIO_CR);
 666         dev_info(gpio->dev, "COH901571/3 block version: %d, " \
 667                  "number of cores: %d totalling %d pins\n",
 668                  ((val & 0x000001FC) >> 2),
 669                  ((val & 0x0000FE00) >> 9),
 670                  ((val & 0x0000FE00) >> 9) * 8);
 671         writel(U300_GPIO_CR_BLOCK_CLKRQ_ENABLE,
 672                gpio->base + U300_GPIO_CR);
 673         u300_gpio_init_coh901571(gpio);
 674 
 675 #ifdef CONFIG_OF_GPIO
 676         gpio->chip.of_node = pdev->dev.of_node;
 677 #endif
 678         err = gpiochip_add_data(&gpio->chip, gpio);
 679         if (err) {
 680                 dev_err(gpio->dev, "unable to add gpiochip: %d\n", err);
 681                 goto err_no_chip;
 682         }
 683 
 684         err = gpiochip_irqchip_add(&gpio->chip,
 685                                    &u300_gpio_irqchip,
 686                                    0,
 687                                    handle_simple_irq,
 688                                    IRQ_TYPE_EDGE_FALLING);
 689         if (err) {
 690                 dev_err(gpio->dev, "no GPIO irqchip\n");
 691                 goto err_no_irqchip;
 692         }
 693 
 694         /* Add each port with its IRQ separately */
 695         for (portno = 0 ; portno < U300_GPIO_NUM_PORTS; portno++) {
 696                 struct u300_gpio_port *port = &gpio->ports[portno];
 697 
 698                 snprintf(port->name, 8, "gpio%d", portno);
 699                 port->number = portno;
 700                 port->gpio = gpio;
 701 
 702                 port->irq = platform_get_irq(pdev, portno);
 703 
 704                 gpiochip_set_chained_irqchip(&gpio->chip,
 705                                              &u300_gpio_irqchip,
 706                                              port->irq,
 707                                              u300_gpio_irq_handler);
 708 
 709                 /* Turns off irq force (test register) for this port */
 710                 writel(0x0, gpio->base + portno * gpio->stride + ifr);
 711         }
 712         dev_dbg(gpio->dev, "initialized %d GPIO ports\n", portno);
 713 
 714         /*
 715          * Add pinctrl pin ranges, the pin controller must be registered
 716          * at this point
 717          */
 718         for (i = 0; i < ARRAY_SIZE(coh901_pintable); i++) {
 719                 struct coh901_pinpair *p = &coh901_pintable[i];
 720 
 721                 err = gpiochip_add_pin_range(&gpio->chip, "pinctrl-u300",
 722                                              p->offset, p->pin_base, 1);
 723                 if (err)
 724                         goto err_no_range;
 725         }
 726 
 727         platform_set_drvdata(pdev, gpio);
 728 
 729         return 0;
 730 
 731 err_no_range:
 732 err_no_irqchip:
 733         gpiochip_remove(&gpio->chip);
 734 err_no_chip:
 735         clk_disable_unprepare(gpio->clk);
 736         dev_err(&pdev->dev, "module ERROR:%d\n", err);
 737         return err;
 738 }
 739 
 740 static int __exit u300_gpio_remove(struct platform_device *pdev)
 741 {
 742         struct u300_gpio *gpio = platform_get_drvdata(pdev);
 743 
 744         /* Turn off the GPIO block */
 745         writel(0x00000000U, gpio->base + U300_GPIO_CR);
 746 
 747         gpiochip_remove(&gpio->chip);
 748         clk_disable_unprepare(gpio->clk);
 749         return 0;
 750 }
 751 
 752 static const struct of_device_id u300_gpio_match[] = {
 753         { .compatible = "stericsson,gpio-coh901" },
 754         {},
 755 };
 756 
 757 static struct platform_driver u300_gpio_driver = {
 758         .driver         = {
 759                 .name   = "u300-gpio",
 760                 .of_match_table = u300_gpio_match,
 761         },
 762         .remove         = __exit_p(u300_gpio_remove),
 763 };
 764 
 765 static int __init u300_gpio_init(void)
 766 {
 767         return platform_driver_probe(&u300_gpio_driver, u300_gpio_probe);
 768 }
 769 
 770 static void __exit u300_gpio_exit(void)
 771 {
 772         platform_driver_unregister(&u300_gpio_driver);
 773 }
 774 
 775 arch_initcall(u300_gpio_init);
 776 module_exit(u300_gpio_exit);
 777 
 778 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
 779 MODULE_DESCRIPTION("ST-Ericsson AB COH 901 335/COH 901 571/3 GPIO driver");
 780 MODULE_LICENSE("GPL");