1/*
2 *  Interrupt routines for Gemini
3 *
4 *  Copyright (C) 2001-2006 Storlink, Corp.
5 *  Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 */
12#include <linux/init.h>
13#include <linux/io.h>
14#include <linux/ioport.h>
15#include <linux/stddef.h>
16#include <linux/list.h>
17#include <linux/sched.h>
18#include <linux/cpu.h>
19
20#include <asm/irq.h>
21#include <asm/mach/irq.h>
22#include <asm/system_misc.h>
23#include <mach/hardware.h>
24
25#define IRQ_SOURCE(base_addr)	(base_addr + 0x00)
26#define IRQ_MASK(base_addr)	(base_addr + 0x04)
27#define IRQ_CLEAR(base_addr)	(base_addr + 0x08)
28#define IRQ_TMODE(base_addr)	(base_addr + 0x0C)
29#define IRQ_TLEVEL(base_addr)	(base_addr + 0x10)
30#define IRQ_STATUS(base_addr)	(base_addr + 0x14)
31#define FIQ_SOURCE(base_addr)	(base_addr + 0x20)
32#define FIQ_MASK(base_addr)	(base_addr + 0x24)
33#define FIQ_CLEAR(base_addr)	(base_addr + 0x28)
34#define FIQ_TMODE(base_addr)	(base_addr + 0x2C)
35#define FIQ_LEVEL(base_addr)	(base_addr + 0x30)
36#define FIQ_STATUS(base_addr)	(base_addr + 0x34)
37
38static void gemini_ack_irq(struct irq_data *d)
39{
40	__raw_writel(1 << d->irq, IRQ_CLEAR(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
41}
42
43static void gemini_mask_irq(struct irq_data *d)
44{
45	unsigned int mask;
46
47	mask = __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
48	mask &= ~(1 << d->irq);
49	__raw_writel(mask, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
50}
51
52static void gemini_unmask_irq(struct irq_data *d)
53{
54	unsigned int mask;
55
56	mask = __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
57	mask |= (1 << d->irq);
58	__raw_writel(mask, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
59}
60
61static struct irq_chip gemini_irq_chip = {
62	.name		= "INTC",
63	.irq_ack	= gemini_ack_irq,
64	.irq_mask	= gemini_mask_irq,
65	.irq_unmask	= gemini_unmask_irq,
66};
67
68static struct resource irq_resource = {
69	.name	= "irq_handler",
70	.start	= GEMINI_INTERRUPT_BASE,
71	.end	= FIQ_STATUS(GEMINI_INTERRUPT_BASE) + 4,
72};
73
74void __init gemini_init_irq(void)
75{
76	unsigned int i, mode = 0, level = 0;
77
78	/*
79	 * Disable the idle handler by default since it is buggy
80	 * For more info see arch/arm/mach-gemini/idle.c
81	 */
82	cpu_idle_poll_ctrl(true);
83
84	request_resource(&iomem_resource, &irq_resource);
85
86	for (i = 0; i < NR_IRQS; i++) {
87		irq_set_chip(i, &gemini_irq_chip);
88		if((i >= IRQ_TIMER1 && i <= IRQ_TIMER3) || (i >= IRQ_SERIRQ0 && i <= IRQ_SERIRQ1)) {
89			irq_set_handler(i, handle_edge_irq);
90			mode |= 1 << i;
91			level |= 1 << i;
92		} else {
93			irq_set_handler(i, handle_level_irq);
94		}
95		irq_clear_status_flags(i, IRQ_NOREQUEST | IRQ_NOPROBE);
96	}
97
98	/* Disable all interrupts */
99	__raw_writel(0, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
100	__raw_writel(0, FIQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
101
102	/* Set interrupt mode */
103	__raw_writel(mode, IRQ_TMODE(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
104	__raw_writel(level, IRQ_TLEVEL(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
105}
106