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

irq.c

/*
 * arch/arm/mach-ks8695/irq.c
 *
 * Copyright (C) 2006 Ben Dooks <ben@simtec.co.uk>
 * Copyright (C) 2006 Simtec Electronics
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/sysdev.h>
#include <linux/io.h>

#include <mach/hardware.h>
#include <asm/irq.h>

#include <asm/mach/irq.h>

#include <mach/regs-irq.h>
#include <mach/regs-gpio.h>

static void ks8695_irq_mask(struct irq_data *d)
{
      unsigned long inten;

      inten = __raw_readl(KS8695_IRQ_VA + KS8695_INTEN);
      inten &= ~(1 << d->irq);

      __raw_writel(inten, KS8695_IRQ_VA + KS8695_INTEN);
}

static void ks8695_irq_unmask(struct irq_data *d)
{
      unsigned long inten;

      inten = __raw_readl(KS8695_IRQ_VA + KS8695_INTEN);
      inten |= (1 << d->irq);

      __raw_writel(inten, KS8695_IRQ_VA + KS8695_INTEN);
}

static void ks8695_irq_ack(struct irq_data *d)
{
      __raw_writel((1 << d->irq), KS8695_IRQ_VA + KS8695_INTST);
}


static struct irq_chip ks8695_irq_level_chip;
static struct irq_chip ks8695_irq_edge_chip;


static int ks8695_irq_set_type(struct irq_data *d, unsigned int type)
{
      unsigned long ctrl, mode;
      unsigned short level_triggered = 0;

      ctrl = __raw_readl(KS8695_GPIO_VA + KS8695_IOPC);

      switch (type) {
            case IRQ_TYPE_LEVEL_HIGH:
                  mode = IOPC_TM_HIGH;
                  level_triggered = 1;
                  break;
            case IRQ_TYPE_LEVEL_LOW:
                  mode = IOPC_TM_LOW;
                  level_triggered = 1;
                  break;
            case IRQ_TYPE_EDGE_RISING:
                  mode = IOPC_TM_RISING;
                  break;
            case IRQ_TYPE_EDGE_FALLING:
                  mode = IOPC_TM_FALLING;
                  break;
            case IRQ_TYPE_EDGE_BOTH:
                  mode = IOPC_TM_EDGE;
                  break;
            default:
                  return -EINVAL;
      }

      switch (d->irq) {
            case KS8695_IRQ_EXTERN0:
                  ctrl &= ~IOPC_IOEINT0TM;
                  ctrl |= IOPC_IOEINT0_MODE(mode);
                  break;
            case KS8695_IRQ_EXTERN1:
                  ctrl &= ~IOPC_IOEINT1TM;
                  ctrl |= IOPC_IOEINT1_MODE(mode);
                  break;
            case KS8695_IRQ_EXTERN2:
                  ctrl &= ~IOPC_IOEINT2TM;
                  ctrl |= IOPC_IOEINT2_MODE(mode);
                  break;
            case KS8695_IRQ_EXTERN3:
                  ctrl &= ~IOPC_IOEINT3TM;
                  ctrl |= IOPC_IOEINT3_MODE(mode);
                  break;
            default:
                  return -EINVAL;
      }

      if (level_triggered) {
            set_irq_chip(d->irq, &ks8695_irq_level_chip);
            set_irq_handler(d->irq, handle_level_irq);
      }
      else {
            set_irq_chip(d->irq, &ks8695_irq_edge_chip);
            set_irq_handler(d->irq, handle_edge_irq);
      }

      __raw_writel(ctrl, KS8695_GPIO_VA + KS8695_IOPC);
      return 0;
}

static struct irq_chip ks8695_irq_level_chip = {
      .irq_ack    = ks8695_irq_mask,
      .irq_mask   = ks8695_irq_mask,
      .irq_unmask = ks8695_irq_unmask,
      .irq_set_type     = ks8695_irq_set_type,
};

static struct irq_chip ks8695_irq_edge_chip = {
      .irq_ack    = ks8695_irq_ack,
      .irq_mask   = ks8695_irq_mask,
      .irq_unmask = ks8695_irq_unmask,
      .irq_set_type     = ks8695_irq_set_type,
};

void __init ks8695_init_irq(void)
{
      unsigned int irq;

      /* Disable all interrupts initially */
      __raw_writel(0, KS8695_IRQ_VA + KS8695_INTMC);
      __raw_writel(0, KS8695_IRQ_VA + KS8695_INTEN);

      for (irq = 0; irq < NR_IRQS; irq++) {
            switch (irq) {
                  /* Level-triggered interrupts */
                  case KS8695_IRQ_BUS_ERROR:
                  case KS8695_IRQ_UART_MODEM_STATUS:
                  case KS8695_IRQ_UART_LINE_STATUS:
                  case KS8695_IRQ_UART_RX:
                  case KS8695_IRQ_COMM_TX:
                  case KS8695_IRQ_COMM_RX:
                        set_irq_chip(irq, &ks8695_irq_level_chip);
                        set_irq_handler(irq, handle_level_irq);
                        break;

                  /* Edge-triggered interrupts */
                  default:
                        /* clear pending bit */
                        ks8695_irq_ack(irq_get_irq_data(irq));
                        set_irq_chip(irq, &ks8695_irq_edge_chip);
                        set_irq_handler(irq, handle_edge_irq);
            }

            set_irq_flags(irq, IRQF_VALID);
      }
}

Generated by  Doxygen 1.6.0   Back to index