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
  20 static 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
  28 static 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
  36 static void intc2_irq_gpio_ack(unsigned int irq)
  37 {
  38         writel(0x1 << (irq - MCFINTC2_GPIOIRQ0), MCF_MBAR2 + MCFSIM2_GPIOINTCLEAR);
  39 }
  40
  41 static 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
  48 static 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
  59 arch_initcall(mcf_intc2_init);