1 /*
2  * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
3  * Copyright (C) 2007-2009 PetaLogix
4  * Copyright (C) 2006 Atmark Techno, Inc.
5  *
6  * This file is subject to the terms and conditions of the GNU General Public
7  * License. See the file "COPYING" in the main directory of this archive
8  * for more details.
9  */
10 
11 #include <linux/init.h>
12 #include <linux/ftrace.h>
13 #include <linux/kernel.h>
14 #include <linux/hardirq.h>
15 #include <linux/interrupt.h>
16 #include <linux/irqflags.h>
17 #include <linux/seq_file.h>
18 #include <linux/kernel_stat.h>
19 #include <linux/irq.h>
20 #include <linux/irqchip.h>
21 #include <linux/of_irq.h>
22 
23 static u32 concurrent_irq;
24 
do_IRQ(struct pt_regs * regs)25 void __irq_entry do_IRQ(struct pt_regs *regs)
26 {
27 	unsigned int irq;
28 	struct pt_regs *old_regs = set_irq_regs(regs);
29 	trace_hardirqs_off();
30 
31 	irq_enter();
32 	irq = xintc_get_irq();
33 next_irq:
34 	BUG_ON(!irq);
35 	generic_handle_irq(irq);
36 
37 	irq = xintc_get_irq();
38 	if (irq != -1U) {
39 		pr_debug("next irq: %d\n", irq);
40 		++concurrent_irq;
41 		goto next_irq;
42 	}
43 
44 	irq_exit();
45 	set_irq_regs(old_regs);
46 	trace_hardirqs_on();
47 }
48 
init_IRQ(void)49 void __init init_IRQ(void)
50 {
51 	/* process the entire interrupt tree in one go */
52 	irqchip_init();
53 }
54