xref: /openbmc/linux/arch/m68k/coldfire/intc-525x.c (revision aaf9128a)
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