Logo Search packages:      
Sourcecode: linux version File versions  Download package

irq-gpioint.c

/* linux/arch/arm/plat-s5p/irq-gpioint.c
 *
 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
 * Author: Kyungmin Park <kyungmin.park@samsung.com>
 * Author: Joonyoung Shim <jy0922.shim@samsung.com>
 * Author: Marek Szyprowski <m.szyprowski@samsung.com>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 */

#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/gpio.h>

#include <mach/map.h>
#include <plat/gpio-core.h>
#include <plat/gpio-cfg.h>

#define S5P_GPIOREG(x)              (S5P_VA_GPIO + (x))

#define GPIOINT_CON_OFFSET          0x700
#define GPIOINT_MASK_OFFSET         0x900
#define GPIOINT_PEND_OFFSET         0xA00

static struct s3c_gpio_chip *irq_chips[S5P_GPIOINT_GROUP_MAXNR];

static int s5p_gpioint_get_group(struct irq_data *data)
{
      struct gpio_chip *chip = irq_data_get_irq_data(data);
      struct s3c_gpio_chip *s3c_chip = container_of(chip,
                  struct s3c_gpio_chip, chip);
      int group;

      for (group = 0; group < S5P_GPIOINT_GROUP_MAXNR; group++)
            if (s3c_chip == irq_chips[group])
                  break;

      return group;
}

static int s5p_gpioint_get_offset(struct irq_data *data)
{
      struct gpio_chip *chip = irq_data_get_irq_data(data);
      struct s3c_gpio_chip *s3c_chip = container_of(chip,
                  struct s3c_gpio_chip, chip);

      return data->irq - s3c_chip->irq_base;
}

static void s5p_gpioint_ack(struct irq_data *data)
{
      int group, offset, pend_offset;
      unsigned int value;

      group = s5p_gpioint_get_group(data);
      offset = s5p_gpioint_get_offset(data);
      pend_offset = group << 2;

      value = __raw_readl(S5P_GPIOREG(GPIOINT_PEND_OFFSET) + pend_offset);
      value |= 1 << offset;
      __raw_writel(value, S5P_GPIOREG(GPIOINT_PEND_OFFSET) + pend_offset);
}

static void s5p_gpioint_mask(struct irq_data *data)
{
      int group, offset, mask_offset;
      unsigned int value;

      group = s5p_gpioint_get_group(data);
      offset = s5p_gpioint_get_offset(data);
      mask_offset = group << 2;

      value = __raw_readl(S5P_GPIOREG(GPIOINT_MASK_OFFSET) + mask_offset);
      value |= 1 << offset;
      __raw_writel(value, S5P_GPIOREG(GPIOINT_MASK_OFFSET) + mask_offset);
}

static void s5p_gpioint_unmask(struct irq_data *data)
{
      int group, offset, mask_offset;
      unsigned int value;

      group = s5p_gpioint_get_group(data);
      offset = s5p_gpioint_get_offset(data);
      mask_offset = group << 2;

      value = __raw_readl(S5P_GPIOREG(GPIOINT_MASK_OFFSET) + mask_offset);
      value &= ~(1 << offset);
      __raw_writel(value, S5P_GPIOREG(GPIOINT_MASK_OFFSET) + mask_offset);
}

static void s5p_gpioint_mask_ack(struct irq_data *data)
{
      s5p_gpioint_mask(data);
      s5p_gpioint_ack(data);
}

static int s5p_gpioint_set_type(struct irq_data *data, unsigned int type)
{
      int group, offset, con_offset;
      unsigned int value;

      group = s5p_gpioint_get_group(data);
      offset = s5p_gpioint_get_offset(data);
      con_offset = group << 2;

      switch (type) {
      case IRQ_TYPE_EDGE_RISING:
            type = S5P_IRQ_TYPE_EDGE_RISING;
            break;
      case IRQ_TYPE_EDGE_FALLING:
            type = S5P_IRQ_TYPE_EDGE_FALLING;
            break;
      case IRQ_TYPE_EDGE_BOTH:
            type = S5P_IRQ_TYPE_EDGE_BOTH;
            break;
      case IRQ_TYPE_LEVEL_HIGH:
            type = S5P_IRQ_TYPE_LEVEL_HIGH;
            break;
      case IRQ_TYPE_LEVEL_LOW:
            type = S5P_IRQ_TYPE_LEVEL_LOW;
            break;
      case IRQ_TYPE_NONE:
      default:
            printk(KERN_WARNING "No irq type\n");
            return -EINVAL;
      }

      value = __raw_readl(S5P_GPIOREG(GPIOINT_CON_OFFSET) + con_offset);
      value &= ~(0x7 << (offset * 0x4));
      value |= (type << (offset * 0x4));
      __raw_writel(value, S5P_GPIOREG(GPIOINT_CON_OFFSET) + con_offset);

      return 0;
}

struct irq_chip s5p_gpioint = {
      .name       = "s5p_gpioint",
      .irq_ack    = s5p_gpioint_ack,
      .irq_mask   = s5p_gpioint_mask,
      .irq_mask_ack     = s5p_gpioint_mask_ack,
      .irq_unmask = s5p_gpioint_unmask,
      .irq_set_type     = s5p_gpioint_set_type,
};

static void s5p_gpioint_handler(unsigned int irq, struct irq_desc *desc)
{
      int group, offset, pend_offset, mask_offset;
      int real_irq;
      unsigned int pend, mask;

      for (group = 0; group < S5P_GPIOINT_GROUP_MAXNR; group++) {
            pend_offset = group << 2;
            pend = __raw_readl(S5P_GPIOREG(GPIOINT_PEND_OFFSET) +
                        pend_offset);
            if (!pend)
                  continue;

            mask_offset = group << 2;
            mask = __raw_readl(S5P_GPIOREG(GPIOINT_MASK_OFFSET) +
                        mask_offset);
            pend &= ~mask;

            for (offset = 0; offset < 8; offset++) {
                  if (pend & (1 << offset)) {
                        struct s3c_gpio_chip *chip = irq_chips[group];
                        if (chip) {
                              real_irq = chip->irq_base + offset;
                              generic_handle_irq(real_irq);
                        }
                  }
            }
      }
}

static __init int s5p_gpioint_add(struct s3c_gpio_chip *chip)
{
      static int used_gpioint_groups = 0;
      static bool handler_registered = 0;
      int irq, group = chip->group;
      int i;

      if (used_gpioint_groups >= S5P_GPIOINT_GROUP_COUNT)
            return -ENOMEM;

      chip->irq_base = S5P_GPIOINT_BASE +
                   used_gpioint_groups * S5P_GPIOINT_GROUP_SIZE;
      used_gpioint_groups++;

      if (!handler_registered) {
            set_irq_chained_handler(IRQ_GPIOINT, s5p_gpioint_handler);
            handler_registered = 1;
      }

      irq_chips[group] = chip;
      for (i = 0; i < chip->chip.ngpio; i++) {
            irq = chip->irq_base + i;
            set_irq_chip(irq, &s5p_gpioint);
            set_irq_data(irq, &chip->chip);
            set_irq_handler(irq, handle_level_irq);
            set_irq_flags(irq, IRQF_VALID);
      }
      return 0;
}

int __init s5p_register_gpio_interrupt(int pin)
{
      struct s3c_gpio_chip *my_chip = s3c_gpiolib_getchip(pin);
      int offset, group;
      int ret;

      if (!my_chip)
            return -EINVAL;

      offset = pin - my_chip->chip.base;
      group = my_chip->group;

      /* check if the group has been already registered */
      if (my_chip->irq_base)
            return my_chip->irq_base + offset;

      /* register gpio group */
      ret = s5p_gpioint_add(my_chip);
      if (ret == 0) {
            my_chip->chip.to_irq = samsung_gpiolib_to_irq;
            printk(KERN_INFO "Registered interrupt support for gpio group %d.\n",
                   group);
            return my_chip->irq_base + offset;
      }
      return ret;
}

Generated by  Doxygen 1.6.0   Back to index