1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
/* arch/arm/plat-samsung/irq-vic-timer.c
* originally part of arch/arm/plat-s3c64xx/irq.c
*
* Copyright 2008 Openmoko, Inc.
* Copyright 2008 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
* http://armlinux.simtec.co.uk/
*
* S3C64XX - Interrupt handling
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <mach/map.h>
#include <plat/irq-vic-timer.h>
#include <plat/regs-timer.h>
static void s3c_irq_demux_vic_timer(unsigned int irq, struct irq_desc *desc)
{
generic_handle_irq((int)desc->irq_data.handler_data);
}
/* We assume the IRQ_TIMER0..IRQ_TIMER4 range is continuous. */
static void s3c_irq_timer_mask(struct irq_data *data)
{
u32 reg = __raw_readl(S3C64XX_TINT_CSTAT);
u32 mask = (u32)data->chip_data;
reg &= 0x1f; /* mask out pending interrupts */
reg &= ~mask;
__raw_writel(reg, S3C64XX_TINT_CSTAT);
}
static void s3c_irq_timer_unmask(struct irq_data *data)
{
u32 reg = __raw_readl(S3C64XX_TINT_CSTAT);
u32 mask = (u32)data->chip_data;
reg &= 0x1f; /* mask out pending interrupts */
reg |= mask;
__raw_writel(reg, S3C64XX_TINT_CSTAT);
}
static void s3c_irq_timer_ack(struct irq_data *data)
{
u32 reg = __raw_readl(S3C64XX_TINT_CSTAT);
u32 mask = (u32)data->chip_data;
reg &= 0x1f;
reg |= mask << 5;
__raw_writel(reg, S3C64XX_TINT_CSTAT);
}
static struct irq_chip s3c_irq_timer = {
.name = "s3c-timer",
.irq_mask = s3c_irq_timer_mask,
.irq_unmask = s3c_irq_timer_unmask,
.irq_ack = s3c_irq_timer_ack,
};
/**
* s3c_init_vic_timer_irq() - initialise timer irq chanined off VIC.\
* @parent_irq: The parent IRQ on the VIC for the timer.
* @timer_irq: The IRQ to be used for the timer.
*
* Register the necessary IRQ chaining and support for the timer IRQs
* chained of the VIC.
*/
void __init s3c_init_vic_timer_irq(unsigned int parent_irq,
unsigned int timer_irq)
{
irq_set_chained_handler(parent_irq, s3c_irq_demux_vic_timer);
irq_set_handler_data(parent_irq, (void *)timer_irq);
irq_set_chip_and_handler(timer_irq, &s3c_irq_timer, handle_level_irq);
irq_set_chip_data(timer_irq, (void *)(1 << (timer_irq - IRQ_TIMER0)));
set_irq_flags(timer_irq, IRQF_VALID);
}
|
