LXR linux/arch/m68knommu/platform/5249/intc2.c

   1/*
   2 * intc2.c  -- support for the 2nd INTC controller of the 5249
   3 *
   4 * (C) Copyright 2009, Greg Ungerer <gerg@snapgear.com>
   5 *
   6 * This file is subject to the terms and conditions of the GNU General Public
   7 * License.  See the file COPYING in the main directory of this archive
   8 * for more details.
   9 */
  10
  11#include <linux/types.h>
  12#include <linux/init.h>
  13#include <linux/kernel.h>
  14#include <linux/interrupt.h>
  15#include <linux/irq.h>
  16#include <linux/io.h>
  17#include <asm/coldfire.h>
  18#include <asm/mcfsim.h>
  19
  20static void intc2_irq_gpio_mask(unsigned int irq)
  21{
  22        u32 imr;
  23        imr = readl(MCF_MBAR2 + MCFSIM2_GPIOINTENABLE);
  24        imr &= ~(0x1 << (irq - MCFINTC2_GPIOIRQ0));
  25        writel(imr, MCF_MBAR2 + MCFSIM2_GPIOINTENABLE);
  26}
  27
  28static void intc2_irq_gpio_unmask(unsigned int irq)
  29{
  30        u32 imr;
  31        imr = readl(MCF_MBAR2 + MCFSIM2_GPIOINTENABLE);
  32        imr |= (0x1 << (irq - MCFINTC2_GPIOIRQ0));
  33        writel(imr, MCF_MBAR2 + MCFSIM2_GPIOINTENABLE);
  34}
  35
  36static void intc2_irq_gpio_ack(unsigned int irq)
  37{
  38        writel(0x1 << (irq - MCFINTC2_GPIOIRQ0), MCF_MBAR2 + MCFSIM2_GPIOINTCLEAR);
  39}
  40
  41static struct irq_chip intc2_irq_gpio_chip = {
  42        .name           = "CF-INTC2",
  43        .mask           = intc2_irq_gpio_mask,
  44        .unmask         = intc2_irq_gpio_unmask,
  45        .ack            = intc2_irq_gpio_ack,
  46};
  47
  48static int __init mcf_intc2_init(void)
  49{
  50        int irq;
  51
  52        /* GPIO interrupt sources */
  53        for (irq = MCFINTC2_GPIOIRQ0; (irq <= MCFINTC2_GPIOIRQ7); irq++)
  54                irq_desc[irq].chip = &intc2_irq_gpio_chip;
  55
  56        return 0;
  57}
  58
  59arch_initcall(mcf_intc2_init);
  60