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Linux/arch/m68k/coldfire/intc-5249.c

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  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(struct irq_data *d)
 21 {
 22         u32 imr;
 23         imr = readl(MCFSIM2_GPIOINTENABLE);
 24         imr &= ~(0x1 << (d->irq - MCF_IRQ_GPIO0));
 25         writel(imr, MCFSIM2_GPIOINTENABLE);
 26 }
 27 
 28 static void intc2_irq_gpio_unmask(struct irq_data *d)
 29 {
 30         u32 imr;
 31         imr = readl(MCFSIM2_GPIOINTENABLE);
 32         imr |= (0x1 << (d->irq - MCF_IRQ_GPIO0));
 33         writel(imr, MCFSIM2_GPIOINTENABLE);
 34 }
 35 
 36 static void intc2_irq_gpio_ack(struct irq_data *d)
 37 {
 38         writel(0x1 << (d->irq - MCF_IRQ_GPIO0), MCFSIM2_GPIOINTCLEAR);
 39 }
 40 
 41 static struct irq_chip intc2_irq_gpio_chip = {
 42         .name           = "CF-INTC2",
 43         .irq_mask       = intc2_irq_gpio_mask,
 44         .irq_unmask     = intc2_irq_gpio_unmask,
 45         .irq_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 = MCF_IRQ_GPIO0; (irq <= MCF_IRQ_GPIO7); irq++) {
 54                 irq_set_chip(irq, &intc2_irq_gpio_chip);
 55                 irq_set_handler(irq, handle_edge_irq);
 56         }
 57 
 58         return 0;
 59 }
 60 
 61 arch_initcall(mcf_intc2_init);
 62 

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