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Linux/arch/m68k/coldfire/intc-525x.c

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  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);
 92 

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