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
  21 static 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
  34 static 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
  47 static 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
  60 static 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
  67 static 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
  75 static 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
  91 arch_initcall(mcf_intc2_init);