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(addr: 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(val: imr, addr: MCFSIM2_GPIOINTENABLE);
32}
33
34static void intc2_irq_gpio_unmask(struct irq_data *d)
35{
36 u32 imr = readl(addr: 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(val: imr, addr: 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(val: imr, addr: 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(val: MCFINTC2_VECBASE, addr: 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

source code of linux/arch/m68k/coldfire/intc-525x.c