LXR linux/arch/m68k/coldfire/intc-525x.c

   1/*
   2 * intc2.c  -- support for the 2nd INTC controller of the 525x
   3 *
   4 * (C) Copyright 2012, Steven King <sfking@fdwdc.com>
   5 * (C) Copyright 2009, Greg Ungerer <gerg@snapgear.com>
   6 *
   7 * This file is subject to the terms and conditions of the GNU General Public
   8 * License.  See the file COPYING in the main directory of this archive
   9 * for more details.
  10 */
  11
  12#include <linux/types.h>
  13#include <linux/init.h>
  14#include <linux/kernel.h>
  15#include <linux/interrupt.h>
  16#include <linux/irq.h>
  17#include <linux/io.h>
  18#include <asm/coldfire.h>
  19#include <asm/mcfsim.h>
  20
  21static void intc2_irq_gpio_mask(struct irq_data *d)
  22{
  23        u32 imr = readl(MCFSIM2_GPIOINTENABLE);
  24        u32 type = irqd_get_trigger_type(d);
  25        int irq = d->irq - MCF_IRQ_GPIO0;
  26
  27        if (type & IRQ_TYPE_EDGE_RISING)
  28                imr &= ~(0x001 << irq);
  29        if (type & IRQ_TYPE_EDGE_FALLING)
  30                imr &= ~(0x100 << irq);
  31        writel(imr, MCFSIM2_GPIOINTENABLE);
  32}
  33
  34static void intc2_irq_gpio_unmask(struct irq_data *d)
  35{
  36        u32 imr = readl(MCFSIM2_GPIOINTENABLE);
  37        u32 type = irqd_get_trigger_type(d);
  38        int irq = d->irq - MCF_IRQ_GPIO0;
  39
  40        if (type & IRQ_TYPE_EDGE_RISING)
  41                imr |= (0x001 << irq);
  42        if (type & IRQ_TYPE_EDGE_FALLING)
  43                imr |= (0x100 << irq);
  44        writel(imr, MCFSIM2_GPIOINTENABLE);
  45}
  46
  47static void intc2_irq_gpio_ack(struct irq_data *d)
  48{
  49        u32 imr = 0;
  50        u32 type = irqd_get_trigger_type(d);
  51        int irq = d->irq - MCF_IRQ_GPIO0;
  52
  53        if (type & IRQ_TYPE_EDGE_RISING)
  54                imr |= (0x001 << irq);
  55        if (type & IRQ_TYPE_EDGE_FALLING)
  56                imr |= (0x100 << irq);
  57        writel(imr, MCFSIM2_GPIOINTCLEAR);
  58}
  59
  60static int intc2_irq_gpio_set_type(struct irq_data *d, unsigned int f)
  61{
  62        if (f & ~IRQ_TYPE_EDGE_BOTH)
  63                return -EINVAL;
  64        return 0;
  65}
  66
  67static struct irq_chip intc2_irq_gpio_chip = {
  68        .name           = "CF-INTC2",
  69        .irq_mask       = intc2_irq_gpio_mask,
  70        .irq_unmask     = intc2_irq_gpio_unmask,
  71        .irq_ack        = intc2_irq_gpio_ack,
  72        .irq_set_type   = intc2_irq_gpio_set_type,
  73};
  74
  75static int __init mcf_intc2_init(void)
  76{
  77        int irq;
  78
  79        /* set the interrupt base for the second interrupt controller */
  80        writel(MCFINTC2_VECBASE, MCFINTC2_INTBASE);
  81
  82        /* GPIO interrupt sources */
  83        for (irq = MCF_IRQ_GPIO0; (irq <= MCF_IRQ_GPIO6); irq++) {
  84                irq_set_chip(irq, &intc2_irq_gpio_chip);
  85                irq_set_handler(irq, handle_edge_irq);
  86        }
  87
  88        return 0;
  89}
  90
  91arch_initcall(mcf_intc2_init);
  92