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Paulius Zaleckas59d3a192009-03-26 10:06:08 +02001/*
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 <asm/irq.h>
19#include <asm/mach/irq.h>
20#include <mach/hardware.h>
21
22#define IRQ_SOURCE(base_addr) (base_addr + 0x00)
23#define IRQ_MASK(base_addr) (base_addr + 0x04)
24#define IRQ_CLEAR(base_addr) (base_addr + 0x08)
25#define IRQ_TMODE(base_addr) (base_addr + 0x0C)
26#define IRQ_TLEVEL(base_addr) (base_addr + 0x10)
27#define IRQ_STATUS(base_addr) (base_addr + 0x14)
28#define FIQ_SOURCE(base_addr) (base_addr + 0x20)
29#define FIQ_MASK(base_addr) (base_addr + 0x24)
30#define FIQ_CLEAR(base_addr) (base_addr + 0x28)
31#define FIQ_TMODE(base_addr) (base_addr + 0x2C)
32#define FIQ_LEVEL(base_addr) (base_addr + 0x30)
33#define FIQ_STATUS(base_addr) (base_addr + 0x34)
34
Lennert Buytenhek413802b2010-11-29 10:30:40 +010035static void gemini_ack_irq(struct irq_data *d)
Paulius Zaleckas59d3a192009-03-26 10:06:08 +020036{
Lennert Buytenhek413802b2010-11-29 10:30:40 +010037 __raw_writel(1 << d->irq, IRQ_CLEAR(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
Paulius Zaleckas59d3a192009-03-26 10:06:08 +020038}
39
Lennert Buytenhek413802b2010-11-29 10:30:40 +010040static void gemini_mask_irq(struct irq_data *d)
Paulius Zaleckas59d3a192009-03-26 10:06:08 +020041{
42 unsigned int mask;
43
44 mask = __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
Lennert Buytenhek413802b2010-11-29 10:30:40 +010045 mask &= ~(1 << d->irq);
Paulius Zaleckas59d3a192009-03-26 10:06:08 +020046 __raw_writel(mask, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
47}
48
Lennert Buytenhek413802b2010-11-29 10:30:40 +010049static void gemini_unmask_irq(struct irq_data *d)
Paulius Zaleckas59d3a192009-03-26 10:06:08 +020050{
51 unsigned int mask;
52
53 mask = __raw_readl(IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
Lennert Buytenhek413802b2010-11-29 10:30:40 +010054 mask |= (1 << d->irq);
Paulius Zaleckas59d3a192009-03-26 10:06:08 +020055 __raw_writel(mask, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
56}
57
58static struct irq_chip gemini_irq_chip = {
Lennert Buytenhek413802b2010-11-29 10:30:40 +010059 .name = "INTC",
60 .irq_ack = gemini_ack_irq,
61 .irq_mask = gemini_mask_irq,
62 .irq_unmask = gemini_unmask_irq,
Paulius Zaleckas59d3a192009-03-26 10:06:08 +020063};
64
65static struct resource irq_resource = {
66 .name = "irq_handler",
67 .start = IO_ADDRESS(GEMINI_INTERRUPT_BASE),
68 .end = IO_ADDRESS(FIQ_STATUS(GEMINI_INTERRUPT_BASE)) + 4,
69};
70
71void __init gemini_init_irq(void)
72{
73 unsigned int i, mode = 0, level = 0;
74
75 /*
Nicolas Pitre8925b0f2011-08-03 06:29:42 -040076 * Disable the idle handler by default since it is buggy
77 * For more info see arch/arm/mach-gemini/idle.c
Paulius Zaleckas59d3a192009-03-26 10:06:08 +020078 */
79 disable_hlt();
80
81 request_resource(&iomem_resource, &irq_resource);
82
83 for (i = 0; i < NR_IRQS; i++) {
Thomas Gleixner6845664a2011-03-24 13:25:22 +010084 irq_set_chip(i, &gemini_irq_chip);
Paulius Zaleckas59d3a192009-03-26 10:06:08 +020085 if((i >= IRQ_TIMER1 && i <= IRQ_TIMER3) || (i >= IRQ_SERIRQ0 && i <= IRQ_SERIRQ1)) {
Thomas Gleixner6845664a2011-03-24 13:25:22 +010086 irq_set_handler(i, handle_edge_irq);
Paulius Zaleckas59d3a192009-03-26 10:06:08 +020087 mode |= 1 << i;
88 level |= 1 << i;
89 } else {
Thomas Gleixner6845664a2011-03-24 13:25:22 +010090 irq_set_handler(i, handle_level_irq);
Paulius Zaleckas59d3a192009-03-26 10:06:08 +020091 }
92 set_irq_flags(i, IRQF_VALID | IRQF_PROBE);
93 }
94
95 /* Disable all interrupts */
96 __raw_writel(0, IRQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
97 __raw_writel(0, FIQ_MASK(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
98
99 /* Set interrupt mode */
100 __raw_writel(mode, IRQ_TMODE(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
101 __raw_writel(level, IRQ_TLEVEL(IO_ADDRESS(GEMINI_INTERRUPT_BASE)));
102}