target/linux/brcm2708/patches-3.18/0002-Add-bcm2708_gpio-driver.patch

   1 From 4f339b429583965a8eb7c23474414d0730db1215 Mon Sep 17 00:00:00 2001
   2 From: popcornmix <popcornmix@gmail.com>
   3 Date: Wed, 8 Oct 2014 18:50:05 +0100
   4 Subject: [PATCH 002/114] Add bcm2708_gpio driver
   5
   6 Signed-off-by: popcornmix <popcornmix@gmail.com>
   7
   8 bcm2708: Add extension to configure internal pulls
   9
  10 The bcm2708 gpio controller supports internal pulls to be used as pull-up,
  11 pull-down or being entirely disabled. As it can be useful for a driver to
  12 change the pull configuration from it's default pull-down state, add an
  13 extension which allows configuring the pull per gpio.
  14
  15 Signed-off-by: Julian Scheel <julian@jusst.de>
  16
  17 bcm2708-gpio: Revert the use of pinctrl_request_gpio
  18
  19 In non-DT systems, pinctrl_request_gpio always fails causing
  20 "requests probe deferral" messages. In DT systems, it isn't useful
  21 because the reference counting is independent of the normal pinctrl
  22 pin reservations.
  23
  24 gpio: Only clear the currently occurring interrupt. Avoids losing interrupts
  25
  26 See: linux #760
  27
  28 bcm2708_gpio: Avoid calling irq_unmask for all interrupts
  29
  30 When setting up the interrupts, specify that the handle_simple_irq
  31 handler should be used. This leaves interrupt acknowledgement to
  32 the caller, and prevents irq_unmask from being called for all
  33 interrupts.
  34
  35 Issue: linux #760
  36 ---
  37  arch/arm/mach-bcm2708/Kconfig             |   8 +
  38  arch/arm/mach-bcm2708/Makefile            |   1 +
  39  arch/arm/mach-bcm2708/bcm2708.c           |  28 ++
  40  arch/arm/mach-bcm2708/bcm2708_gpio.c      | 426 ++++++++++++++++++++++++++++++
  41  arch/arm/mach-bcm2708/include/mach/gpio.h |  17 ++
  42  include/linux/platform_data/bcm2708.h     |  23 ++
  43  6 files changed, 503 insertions(+)
  44  create mode 100644 arch/arm/mach-bcm2708/bcm2708_gpio.c
  45  create mode 100644 arch/arm/mach-bcm2708/include/mach/gpio.h
  46  create mode 100644 include/linux/platform_data/bcm2708.h
  47
  48 diff --git a/arch/arm/mach-bcm2708/Kconfig b/arch/arm/mach-bcm2708/Kconfig
  49 index 1f11478..9355841 100644
  50 --- a/arch/arm/mach-bcm2708/Kconfig
  51 +++ b/arch/arm/mach-bcm2708/Kconfig
  52 @@ -9,6 +9,14 @@ config MACH_BCM2708
  53         help
  54           Include support for the Broadcom(R) BCM2708 platform.
  55
  56 +config BCM2708_GPIO
  57 +       bool "BCM2708 gpio support"
  58 +       depends on MACH_BCM2708
  59 +       select ARCH_REQUIRE_GPIOLIB
  60 +        default y
  61 +       help
  62 +         Include support for the Broadcom(R) BCM2708 gpio.
  63 +
  64  config BCM2708_VCMEM
  65         bool "Videocore Memory"
  66         depends on MACH_BCM2708
  67 diff --git a/arch/arm/mach-bcm2708/Makefile b/arch/arm/mach-bcm2708/Makefile
  68 index c76f39bc..a722f3f 100644
  69 --- a/arch/arm/mach-bcm2708/Makefile
  70 +++ b/arch/arm/mach-bcm2708/Makefile
  71 @@ -3,4 +3,5 @@
  72  #
  73
  74  obj-$(CONFIG_MACH_BCM2708)     += clock.o bcm2708.o armctrl.o vcio.o power.o dma.o
  75 +obj-$(CONFIG_BCM2708_GPIO)     += bcm2708_gpio.o
  76  obj-$(CONFIG_BCM2708_VCMEM)    += vc_mem.o
  77 diff --git a/arch/arm/mach-bcm2708/bcm2708.c b/arch/arm/mach-bcm2708/bcm2708.c
  78 index 9b4e709..7503649 100644
  79 --- a/arch/arm/mach-bcm2708/bcm2708.c
  80 +++ b/arch/arm/mach-bcm2708/bcm2708.c
  81 @@ -331,6 +331,31 @@ static struct platform_device bcm2708_vcio_device = {
  82                 },
  83  };
  84
  85 +#ifdef CONFIG_BCM2708_GPIO
  86 +#define BCM_GPIO_DRIVER_NAME "bcm2708_gpio"
  87 +
  88 +static struct resource bcm2708_gpio_resources[] = {
  89 +       [0] = {                 /* general purpose I/O */
  90 +              .start = GPIO_BASE,
  91 +              .end = GPIO_BASE + SZ_4K - 1,
  92 +              .flags = IORESOURCE_MEM,
  93 +              },
  94 +};
  95 +
  96 +static u64 gpio_dmamask = DMA_BIT_MASK(DMA_MASK_BITS_COMMON);
  97 +
  98 +static struct platform_device bcm2708_gpio_device = {
  99 +       .name = BCM_GPIO_DRIVER_NAME,
 100 +       .id = -1,               /* only one VideoCore I/O area */
 101 +       .resource = bcm2708_gpio_resources,
 102 +       .num_resources = ARRAY_SIZE(bcm2708_gpio_resources),
 103 +       .dev = {
 104 +               .dma_mask = &gpio_dmamask,
 105 +               .coherent_dma_mask = DMA_BIT_MASK(DMA_MASK_BITS_COMMON),
 106 +               },
 107 +};
 108 +#endif
 109 +
 110  static struct resource bcm2708_systemtimer_resources[] = {
 111         [0] = {                 /* system timer access */
 112                .start = ST_BASE,
 113 @@ -473,6 +498,9 @@ void __init bcm2708_init(void)
 114
 115         bcm_register_device(&bcm2708_dmaman_device);
 116         bcm_register_device(&bcm2708_vcio_device);
 117 +#ifdef CONFIG_BCM2708_GPIO
 118 +       bcm_register_device(&bcm2708_gpio_device);
 119 +#endif
 120         bcm_register_device(&bcm2708_systemtimer_device);
 121         bcm_register_device(&bcm2708_fb_device);
 122         bcm_register_device(&bcm2708_usb_device);
 123 diff --git a/arch/arm/mach-bcm2708/bcm2708_gpio.c b/arch/arm/mach-bcm2708/bcm2708_gpio.c
 124 new file mode 100644
 125 index 0000000..c1e9254
 126 --- /dev/null
 127 +++ b/arch/arm/mach-bcm2708/bcm2708_gpio.c
 128 @@ -0,0 +1,426 @@
 129 +/*
 130 + *  linux/arch/arm/mach-bcm2708/bcm2708_gpio.c
 131 + *
 132 + *  Copyright (C) 2010 Broadcom
 133 + *
 134 + * This program is free software; you can redistribute it and/or modify
 135 + * it under the terms of the GNU General Public License version 2 as
 136 + * published by the Free Software Foundation.
 137 + *
 138 + */
 139 +
 140 +#include <linux/spinlock.h>
 141 +#include <linux/module.h>
 142 +#include <linux/delay.h>
 143 +#include <linux/list.h>
 144 +#include <linux/io.h>
 145 +#include <linux/irq.h>
 146 +#include <linux/interrupt.h>
 147 +#include <linux/slab.h>
 148 +#include <mach/gpio.h>
 149 +#include <linux/gpio.h>
 150 +#include <linux/platform_device.h>
 151 +#include <mach/platform.h>
 152 +#include <linux/pinctrl/consumer.h>
 153 +
 154 +#include <linux/platform_data/bcm2708.h>
 155 +
 156 +#define BCM_GPIO_DRIVER_NAME "bcm2708_gpio"
 157 +#define DRIVER_NAME BCM_GPIO_DRIVER_NAME
 158 +#define BCM_GPIO_USE_IRQ 1
 159 +
 160 +#define GPIOFSEL(x)  (0x00+(x)*4)
 161 +#define GPIOSET(x)   (0x1c+(x)*4)
 162 +#define GPIOCLR(x)   (0x28+(x)*4)
 163 +#define GPIOLEV(x)   (0x34+(x)*4)
 164 +#define GPIOEDS(x)   (0x40+(x)*4)
 165 +#define GPIOREN(x)   (0x4c+(x)*4)
 166 +#define GPIOFEN(x)   (0x58+(x)*4)
 167 +#define GPIOHEN(x)   (0x64+(x)*4)
 168 +#define GPIOLEN(x)   (0x70+(x)*4)
 169 +#define GPIOAREN(x)  (0x7c+(x)*4)
 170 +#define GPIOAFEN(x)  (0x88+(x)*4)
 171 +#define GPIOUD(x)    (0x94+(x)*4)
 172 +#define GPIOUDCLK(x) (0x98+(x)*4)
 173 +
 174 +#define GPIO_BANKS 2
 175 +
 176 +enum { GPIO_FSEL_INPUT, GPIO_FSEL_OUTPUT,
 177 +       GPIO_FSEL_ALT5, GPIO_FSEL_ALT_4,
 178 +       GPIO_FSEL_ALT0, GPIO_FSEL_ALT1,
 179 +       GPIO_FSEL_ALT2, GPIO_FSEL_ALT3,
 180 +};
 181 +
 182 +       /* Each of the two spinlocks protects a different set of hardware
 183 +        * regiters and data structurs. This decouples the code of the IRQ from
 184 +        * the GPIO code. This also makes the case of a GPIO routine call from
 185 +        * the IRQ code simpler.
 186 +        */
 187 +static DEFINE_SPINLOCK(lock);  /* GPIO registers */
 188 +
 189 +struct bcm2708_gpio {
 190 +       struct list_head list;
 191 +       void __iomem *base;
 192 +       struct gpio_chip gc;
 193 +       unsigned long rising[(BCM2708_NR_GPIOS + 31) / 32];
 194 +       unsigned long falling[(BCM2708_NR_GPIOS + 31) / 32];
 195 +       unsigned long high[(BCM2708_NR_GPIOS + 31) / 32];
 196 +       unsigned long low[(BCM2708_NR_GPIOS + 31) / 32];
 197 +};
 198 +
 199 +static int bcm2708_set_function(struct gpio_chip *gc, unsigned offset,
 200 +                               int function)
 201 +{
 202 +       struct bcm2708_gpio *gpio = container_of(gc, struct bcm2708_gpio, gc);
 203 +       unsigned long flags;
 204 +       unsigned gpiodir;
 205 +       unsigned gpio_bank = offset / 10;
 206 +       unsigned gpio_field_offset = (offset - 10 * gpio_bank) * 3;
 207 +
 208 +//printk(KERN_ERR DRIVER_NAME ": bcm2708_gpio_set_function %p (%d,%d)\n", gc, offset, function);
 209 +       if (offset >= BCM2708_NR_GPIOS)
 210 +               return -EINVAL;
 211 +
 212 +       spin_lock_irqsave(&lock, flags);
 213 +
 214 +       gpiodir = readl(gpio->base + GPIOFSEL(gpio_bank));
 215 +       gpiodir &= ~(7 << gpio_field_offset);
 216 +       gpiodir |= function << gpio_field_offset;
 217 +       writel(gpiodir, gpio->base + GPIOFSEL(gpio_bank));
 218 +       spin_unlock_irqrestore(&lock, flags);
 219 +       gpiodir = readl(gpio->base + GPIOFSEL(gpio_bank));
 220 +
 221 +       return 0;
 222 +}
 223 +
 224 +static int bcm2708_gpio_dir_in(struct gpio_chip *gc, unsigned offset)
 225 +{
 226 +       return bcm2708_set_function(gc, offset, GPIO_FSEL_INPUT);
 227 +}
 228 +
 229 +static void bcm2708_gpio_set(struct gpio_chip *gc, unsigned offset, int value);
 230 +static int bcm2708_gpio_dir_out(struct gpio_chip *gc, unsigned offset,
 231 +                               int value)
 232 +{
 233 +       int ret;
 234 +       ret = bcm2708_set_function(gc, offset, GPIO_FSEL_OUTPUT);
 235 +       if (ret >= 0)
 236 +               bcm2708_gpio_set(gc, offset, value);
 237 +       return ret;
 238 +}
 239 +
 240 +static int bcm2708_gpio_get(struct gpio_chip *gc, unsigned offset)
 241 +{
 242 +       struct bcm2708_gpio *gpio = container_of(gc, struct bcm2708_gpio, gc);
 243 +       unsigned gpio_bank = offset / 32;
 244 +       unsigned gpio_field_offset = (offset - 32 * gpio_bank);
 245 +       unsigned lev;
 246 +
 247 +       if (offset >= BCM2708_NR_GPIOS)
 248 +               return 0;
 249 +       lev = readl(gpio->base + GPIOLEV(gpio_bank));
 250 +//printk(KERN_ERR DRIVER_NAME ": bcm2708_gpio_get %p (%d)=%d\n", gc, offset, 0x1 & (lev>>gpio_field_offset));
 251 +       return 0x1 & (lev >> gpio_field_offset);
 252 +}
 253 +
 254 +static void bcm2708_gpio_set(struct gpio_chip *gc, unsigned offset, int value)
 255 +{
 256 +       struct bcm2708_gpio *gpio = container_of(gc, struct bcm2708_gpio, gc);
 257 +       unsigned gpio_bank = offset / 32;
 258 +       unsigned gpio_field_offset = (offset - 32 * gpio_bank);
 259 +//printk(KERN_ERR DRIVER_NAME ": bcm2708_gpio_set %p (%d=%d)\n", gc, offset, value);
 260 +       if (offset >= BCM2708_NR_GPIOS)
 261 +               return;
 262 +       if (value)
 263 +               writel(1 << gpio_field_offset, gpio->base + GPIOSET(gpio_bank));
 264 +       else
 265 +               writel(1 << gpio_field_offset, gpio->base + GPIOCLR(gpio_bank));
 266 +}
 267 +
 268 +/**********************
 269 + * extension to configure pullups
 270 + */
 271 +int bcm2708_gpio_setpull(struct gpio_chip *gc, unsigned offset,
 272 +               bcm2708_gpio_pull_t value)
 273 +{
 274 +       struct bcm2708_gpio *gpio = container_of(gc, struct bcm2708_gpio, gc);
 275 +       unsigned gpio_bank = offset / 32;
 276 +       unsigned gpio_field_offset = (offset - 32 * gpio_bank);
 277 +
 278 +       if (offset >= BCM2708_NR_GPIOS)
 279 +               return -EINVAL;
 280 +
 281 +       switch (value) {
 282 +       case BCM2708_PULL_UP:
 283 +               writel(2, gpio->base + GPIOUD(0));
 284 +               break;
 285 +       case BCM2708_PULL_DOWN:
 286 +               writel(1, gpio->base + GPIOUD(0));
 287 +               break;
 288 +       case BCM2708_PULL_OFF:
 289 +               writel(0, gpio->base + GPIOUD(0));
 290 +               break;
 291 +       }
 292 +
 293 +       udelay(5);
 294 +       writel(1 << gpio_field_offset, gpio->base + GPIOUDCLK(gpio_bank));
 295 +       udelay(5);
 296 +       writel(0, gpio->base + GPIOUD(0));
 297 +       writel(0 << gpio_field_offset, gpio->base + GPIOUDCLK(gpio_bank));
 298 +
 299 +       return 0;
 300 +}
 301 +EXPORT_SYMBOL(bcm2708_gpio_setpull);
 302 +
 303 +/*************************************************************************************************************************
 304 + * bcm2708 GPIO IRQ
 305 + */
 306 +
 307 +#if BCM_GPIO_USE_IRQ
 308 +
 309 +static int bcm2708_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
 310 +{
 311 +       return gpio_to_irq(gpio);
 312 +}
 313 +
 314 +static int bcm2708_gpio_irq_set_type(struct irq_data *d, unsigned type)
 315 +{
 316 +       unsigned irq = d->irq;
 317 +       struct bcm2708_gpio *gpio = irq_get_chip_data(irq);
 318 +       unsigned gn = irq_to_gpio(irq);
 319 +       unsigned gb = gn / 32;
 320 +       unsigned go = gn % 32;
 321 +
 322 +       gpio->rising[gb]  &= ~(1 << go);
 323 +       gpio->falling[gb] &= ~(1 << go);
 324 +       gpio->high[gb]    &= ~(1 << go);
 325 +       gpio->low[gb]     &= ~(1 << go);
 326 +
 327 +       if (type & ~(IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
 328 +               return -EINVAL;
 329 +
 330 +       if (type & IRQ_TYPE_EDGE_RISING)
 331 +               gpio->rising[gb] |= (1 << go);
 332 +       if (type & IRQ_TYPE_EDGE_FALLING)
 333 +               gpio->falling[gb] |= (1 << go);
 334 +       if (type & IRQ_TYPE_LEVEL_HIGH)
 335 +               gpio->high[gb] |= (1 << go);
 336 +       if (type & IRQ_TYPE_LEVEL_LOW)
 337 +               gpio->low[gb] |= (1 << go);
 338 +       return 0;
 339 +}
 340 +
 341 +static void bcm2708_gpio_irq_mask(struct irq_data *d)
 342 +{
 343 +       unsigned irq = d->irq;
 344 +       struct bcm2708_gpio *gpio = irq_get_chip_data(irq);
 345 +       unsigned gn = irq_to_gpio(irq);
 346 +       unsigned gb = gn / 32;
 347 +       unsigned long rising  = readl(gpio->base + GPIOREN(gb));
 348 +       unsigned long falling = readl(gpio->base + GPIOFEN(gb));
 349 +       unsigned long high    = readl(gpio->base + GPIOHEN(gb));
 350 +       unsigned long low     = readl(gpio->base + GPIOLEN(gb));
 351 +
 352 +       gn = gn % 32;
 353 +
 354 +       writel(rising  & ~(1 << gn), gpio->base + GPIOREN(gb));
 355 +       writel(falling & ~(1 << gn), gpio->base + GPIOFEN(gb));
 356 +       writel(high    & ~(1 << gn), gpio->base + GPIOHEN(gb));
 357 +       writel(low     & ~(1 << gn), gpio->base + GPIOLEN(gb));
 358 +}
 359 +
 360 +static void bcm2708_gpio_irq_unmask(struct irq_data *d)
 361 +{
 362 +       unsigned irq = d->irq;
 363 +       struct bcm2708_gpio *gpio = irq_get_chip_data(irq);
 364 +       unsigned gn = irq_to_gpio(irq);
 365 +       unsigned gb = gn / 32;
 366 +       unsigned go = gn % 32;
 367 +       unsigned long rising  = readl(gpio->base + GPIOREN(gb));
 368 +       unsigned long falling = readl(gpio->base + GPIOFEN(gb));
 369 +       unsigned long high    = readl(gpio->base + GPIOHEN(gb));
 370 +       unsigned long low     = readl(gpio->base + GPIOLEN(gb));
 371 +
 372 +       if (gpio->rising[gb] & (1 << go)) {
 373 +               writel(rising |  (1 << go), gpio->base + GPIOREN(gb));
 374 +       } else {
 375 +               writel(rising & ~(1 << go), gpio->base + GPIOREN(gb));
 376 +       }
 377 +
 378 +       if (gpio->falling[gb] & (1 << go)) {
 379 +               writel(falling |  (1 << go), gpio->base + GPIOFEN(gb));
 380 +       } else {
 381 +               writel(falling & ~(1 << go), gpio->base + GPIOFEN(gb));
 382 +       }
 383 +
 384 +       if (gpio->high[gb] & (1 << go)) {
 385 +               writel(high |  (1 << go), gpio->base + GPIOHEN(gb));
 386 +       } else {
 387 +               writel(high & ~(1 << go), gpio->base + GPIOHEN(gb));
 388 +       }
 389 +
 390 +       if (gpio->low[gb] & (1 << go)) {
 391 +               writel(low |  (1 << go), gpio->base + GPIOLEN(gb));
 392 +       } else {
 393 +               writel(low & ~(1 << go), gpio->base + GPIOLEN(gb));
 394 +       }
 395 +}
 396 +
 397 +static struct irq_chip bcm2708_irqchip = {
 398 +       .name = "GPIO",
 399 +       .irq_enable = bcm2708_gpio_irq_unmask,
 400 +       .irq_disable = bcm2708_gpio_irq_mask,
 401 +       .irq_unmask = bcm2708_gpio_irq_unmask,
 402 +       .irq_mask = bcm2708_gpio_irq_mask,
 403 +       .irq_set_type = bcm2708_gpio_irq_set_type,
 404 +};
 405 +
 406 +static irqreturn_t bcm2708_gpio_interrupt(int irq, void *dev_id)
 407 +{
 408 +       unsigned long edsr;
 409 +       unsigned bank;
 410 +       int i;
 411 +       unsigned gpio;
 412 +       unsigned level_bits;
 413 +       struct bcm2708_gpio *gpio_data = dev_id;
 414 +
 415 +       for (bank = 0; bank < GPIO_BANKS; bank++) {
 416 +               edsr = readl(__io_address(GPIO_BASE) + GPIOEDS(bank));
 417 +               level_bits = gpio_data->high[bank] | gpio_data->low[bank];
 418 +
 419 +               for_each_set_bit(i, &edsr, 32) {
 420 +                       gpio = i + bank * 32;
 421 +                       /* ack edge triggered IRQs immediately */
 422 +                       if (!(level_bits & (1<<i)))
 423 +                               writel(1<<i,
 424 +                                      __io_address(GPIO_BASE) + GPIOEDS(bank));
 425 +                       generic_handle_irq(gpio_to_irq(gpio));
 426 +                       /* ack level triggered IRQ after handling them */
 427 +                       if (level_bits & (1<<i))
 428 +                               writel(1<<i,
 429 +                                      __io_address(GPIO_BASE) + GPIOEDS(bank));
 430 +               }
 431 +       }
 432 +       return IRQ_HANDLED;
 433 +}
 434 +
 435 +static struct irqaction bcm2708_gpio_irq = {
 436 +       .name = "BCM2708 GPIO catchall handler",
 437 +       .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
 438 +       .handler = bcm2708_gpio_interrupt,
 439 +};
 440 +
 441 +static void bcm2708_gpio_irq_init(struct bcm2708_gpio *ucb)
 442 +{
 443 +       unsigned irq;
 444 +
 445 +       ucb->gc.to_irq = bcm2708_gpio_to_irq;
 446 +
 447 +       for (irq = GPIO_IRQ_START; irq < (GPIO_IRQ_START + GPIO_IRQS); irq++) {
 448 +               irq_set_chip_data(irq, ucb);
 449 +               irq_set_chip_and_handler(irq, &bcm2708_irqchip,
 450 +                                        handle_simple_irq);
 451 +               set_irq_flags(irq, IRQF_VALID);
 452 +       }
 453 +
 454 +       bcm2708_gpio_irq.dev_id = ucb;
 455 +       setup_irq(IRQ_GPIO3, &bcm2708_gpio_irq);
 456 +}
 457 +
 458 +#else
 459 +
 460 +static void bcm2708_gpio_irq_init(struct bcm2708_gpio *ucb)
 461 +{
 462 +}
 463 +
 464 +#endif /* #if BCM_GPIO_USE_IRQ ***************************************************************************************************************** */
 465 +
 466 +static int bcm2708_gpio_probe(struct platform_device *dev)
 467 +{
 468 +       struct bcm2708_gpio *ucb;
 469 +       struct resource *res;
 470 +       int bank;
 471 +       int err = 0;
 472 +
 473 +       printk(KERN_INFO DRIVER_NAME ": bcm2708_gpio_probe %p\n", dev);
 474 +
 475 +       ucb = kzalloc(sizeof(*ucb), GFP_KERNEL);
 476 +       if (NULL == ucb) {
 477 +               printk(KERN_ERR DRIVER_NAME ": failed to allocate "
 478 +                      "mailbox memory\n");
 479 +               err = -ENOMEM;
 480 +               goto err;
 481 +       }
 482 +
 483 +       res = platform_get_resource(dev, IORESOURCE_MEM, 0);
 484 +
 485 +       platform_set_drvdata(dev, ucb);
 486 +       ucb->base = __io_address(GPIO_BASE);
 487 +
 488 +       ucb->gc.label = "bcm2708_gpio";
 489 +       ucb->gc.base = 0;
 490 +       ucb->gc.ngpio = BCM2708_NR_GPIOS;
 491 +       ucb->gc.owner = THIS_MODULE;
 492 +
 493 +       ucb->gc.direction_input = bcm2708_gpio_dir_in;
 494 +       ucb->gc.direction_output = bcm2708_gpio_dir_out;
 495 +       ucb->gc.get = bcm2708_gpio_get;
 496 +       ucb->gc.set = bcm2708_gpio_set;
 497 +       ucb->gc.can_sleep = 0;
 498 +
 499 +       for (bank = 0; bank < GPIO_BANKS; bank++) {
 500 +               writel(0, ucb->base + GPIOREN(bank));
 501 +               writel(0, ucb->base + GPIOFEN(bank));
 502 +               writel(0, ucb->base + GPIOHEN(bank));
 503 +               writel(0, ucb->base + GPIOLEN(bank));
 504 +               writel(0, ucb->base + GPIOAREN(bank));
 505 +               writel(0, ucb->base + GPIOAFEN(bank));
 506 +               writel(~0, ucb->base + GPIOEDS(bank));
 507 +       }
 508 +
 509 +       bcm2708_gpio_irq_init(ucb);
 510 +
 511 +       err = gpiochip_add(&ucb->gc);
 512 +
 513 +err:
 514 +       return err;
 515 +
 516 +}
 517 +
 518 +static int bcm2708_gpio_remove(struct platform_device *dev)
 519 +{
 520 +       int err = 0;
 521 +       struct bcm2708_gpio *ucb = platform_get_drvdata(dev);
 522 +
 523 +       printk(KERN_ERR DRIVER_NAME ": bcm2708_gpio_remove %p\n", dev);
 524 +
 525 +       gpiochip_remove(&ucb->gc);
 526 +
 527 +       platform_set_drvdata(dev, NULL);
 528 +       kfree(ucb);
 529 +
 530 +       return err;
 531 +}
 532 +
 533 +static struct platform_driver bcm2708_gpio_driver = {
 534 +       .probe = bcm2708_gpio_probe,
 535 +       .remove = bcm2708_gpio_remove,
 536 +       .driver = {
 537 +                  .name = "bcm2708_gpio"},
 538 +};
 539 +
 540 +static int __init bcm2708_gpio_init(void)
 541 +{
 542 +       return platform_driver_register(&bcm2708_gpio_driver);
 543 +}
 544 +
 545 +static void __exit bcm2708_gpio_exit(void)
 546 +{
 547 +       platform_driver_unregister(&bcm2708_gpio_driver);
 548 +}
 549 +
 550 +module_init(bcm2708_gpio_init);
 551 +module_exit(bcm2708_gpio_exit);
 552 +
 553 +MODULE_DESCRIPTION("Broadcom BCM2708 GPIO driver");
 554 +MODULE_LICENSE("GPL");
 555 diff --git a/arch/arm/mach-bcm2708/include/mach/gpio.h b/arch/arm/mach-bcm2708/include/mach/gpio.h
 556 new file mode 100644
 557 index 0000000..7965a97
 558 --- /dev/null
 559 +++ b/arch/arm/mach-bcm2708/include/mach/gpio.h
 560 @@ -0,0 +1,17 @@
 561 +/*
 562 + * arch/arm/mach-bcm2708/include/mach/gpio.h
 563 + *
 564 + * This file is licensed under the terms of the GNU General Public
 565 + * License version 2.  This program is licensed "as is" without any
 566 + * warranty of any kind, whether express or implied.
 567 + */
 568 +
 569 +#ifndef __ASM_ARCH_GPIO_H
 570 +#define __ASM_ARCH_GPIO_H
 571 +
 572 +#define BCM2708_NR_GPIOS 54 // number of gpio lines
 573 +
 574 +#define gpio_to_irq(x) ((x) + GPIO_IRQ_START)
 575 +#define irq_to_gpio(x) ((x) - GPIO_IRQ_START)
 576 +
 577 +#endif
 578 diff --git a/include/linux/platform_data/bcm2708.h b/include/linux/platform_data/bcm2708.h
 579 new file mode 100644
 580 index 0000000..fb69624
 581 --- /dev/null
 582 +++ b/include/linux/platform_data/bcm2708.h
 583 @@ -0,0 +1,23 @@
 584 +/*
 585 + * include/linux/platform_data/bcm2708.h
 586 + *
 587 + * This program is free software; you can redistribute it and/or modify
 588 + * it under the terms of the GNU General Public License version 2 as
 589 + * published by the Free Software Foundation.
 590 + *
 591 + * (C) 2014 Julian Scheel <julian@jusst.de>
 592 + *
 593 + */
 594 +#ifndef __BCM2708_H_
 595 +#define __BCM2708_H_
 596 +
 597 +typedef enum {
 598 +       BCM2708_PULL_OFF,
 599 +       BCM2708_PULL_UP,
 600 +       BCM2708_PULL_DOWN
 601 +} bcm2708_gpio_pull_t;
 602 +
 603 +extern int bcm2708_gpio_setpull(struct gpio_chip *gc, unsigned offset,
 604 +               bcm2708_gpio_pull_t value);
 605 +
 606 +#endif
 607 --
 608 1.8.3.2
 609