summaryrefslogtreecommitdiff
path: root/arch/c6x/kernel/irq.c
blob: c6b36e86a010e14bc2b695e31047ff336aff5963 (plain)
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
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
/*
 *  Copyright (C) 2011 Texas Instruments Incorporated
 *
 *  This borrows heavily from powerpc version, which is:
 *
 *  Derived from arch/i386/kernel/irq.c
 *    Copyright (C) 1992 Linus Torvalds
 *  Adapted from arch/i386 by Gary Thomas
 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
 *  Updated and modified by Cort Dougan <cort@fsmlabs.com>
 *    Copyright (C) 1996-2001 Cort Dougan
 *  Adapted for Power Macintosh by Paul Mackerras
 *    Copyright (C) 1996 Paul Mackerras (paulus@cs.anu.edu.au)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */
#include <linux/slab.h>
#include <linux/seq_file.h>
#include <linux/radix-tree.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>

#include <asm/megamod-pic.h>

unsigned long irq_err_count;

static DEFINE_RAW_SPINLOCK(core_irq_lock);

static void mask_core_irq(struct irq_data *data)
{
	unsigned int prio = data->irq;

	BUG_ON(prio < 4 || prio >= NR_PRIORITY_IRQS);

	raw_spin_lock(&core_irq_lock);
	and_creg(IER, ~(1 << prio));
	raw_spin_unlock(&core_irq_lock);
}

static void unmask_core_irq(struct irq_data *data)
{
	unsigned int prio = data->irq;

	raw_spin_lock(&core_irq_lock);
	or_creg(IER, 1 << prio);
	raw_spin_unlock(&core_irq_lock);
}

static struct irq_chip core_chip = {
	.name		= "core",
	.irq_mask	= mask_core_irq,
	.irq_unmask	= unmask_core_irq,
};

asmlinkage void c6x_do_IRQ(unsigned int prio, struct pt_regs *regs)
{
	struct pt_regs *old_regs = set_irq_regs(regs);

	irq_enter();

	BUG_ON(prio < 4 || prio >= NR_PRIORITY_IRQS);

	generic_handle_irq(prio);

	irq_exit();

	set_irq_regs(old_regs);
}

static struct irq_domain *core_domain;

static int core_domain_map(struct irq_domain *h, unsigned int virq,
			   irq_hw_number_t hw)
{
	if (hw < 4 || hw >= NR_PRIORITY_IRQS)
		return -EINVAL;

	irq_set_status_flags(virq, IRQ_LEVEL);
	irq_set_chip_and_handler(virq, &core_chip, handle_level_irq);
	return 0;
}

static const struct irq_domain_ops core_domain_ops = {
	.map = core_domain_map,
};

void __init init_IRQ(void)
{
	struct device_node *np;

	/* Mask all priority IRQs */
	and_creg(IER, ~0xfff0);

	np = of_find_compatible_node(NULL, NULL, "ti,c64x+core-pic");
	if (np != NULL) {
		/* create the core host */
		core_domain = irq_domain_add_legacy(np, NR_PRIORITY_IRQS,
						    0, 0, &core_domain_ops,
						    NULL);
		if (core_domain)
			irq_set_default_host(core_domain);
		of_node_put(np);
	}

	printk(KERN_INFO "Core interrupt controller initialized\n");

	/* now we're ready for other SoC controllers */
	megamod_pic_init();

	/* Clear all general IRQ flags */
	set_creg(ICR, 0xfff0);
}

void ack_bad_irq(int irq)
{
	printk(KERN_ERR "IRQ: spurious interrupt %d\n", irq);
	irq_err_count++;
}

int arch_show_interrupts(struct seq_file *p, int prec)
{
	seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count);
	return 0;
}

irq_hw_number_t irqd_to_hwirq(struct irq_data *d)
{
	return d->hwirq;
}
EXPORT_SYMBOL_GPL(irqd_to_hwirq);

irq_hw_number_t virq_to_hw(unsigned int virq)
{
	struct irq_data *irq_data = irq_get_irq_data(virq);
	return WARN_ON(!irq_data) ? 0 : irq_data->hwirq;
}
EXPORT_SYMBOL_GPL(virq_to_hw);