1/*
2 * Handle interrupts from the SRM, assuming no additional weirdness.
3 */
4
5#include <linux/init.h>
6#include <linux/sched.h>
7#include <linux/irq.h>
8
9#include "proto.h"
10#include "irq_impl.h"
11
12
13/*
14 * Is the palcode SMP safe? In other words: can we call cserve_ena/dis
15 * at the same time in multiple CPUs? To be safe I added a spinlock
16 * but it can be removed trivially if the palcode is robust against smp.
17 */
18DEFINE_SPINLOCK(srm_irq_lock);
19
20static inline void
21srm_enable_irq(unsigned int irq)
22{
23	spin_lock(&srm_irq_lock);
24	cserve_ena(irq - 16);
25	spin_unlock(&srm_irq_lock);
26}
27
28static void
29srm_disable_irq(unsigned int irq)
30{
31	spin_lock(&srm_irq_lock);
32	cserve_dis(irq - 16);
33	spin_unlock(&srm_irq_lock);
34}
35
36static unsigned int
37srm_startup_irq(unsigned int irq)
38{
39	srm_enable_irq(irq);
40	return 0;
41}
42
43static void
44srm_end_irq(unsigned int irq)
45{
46	if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
47		srm_enable_irq(irq);
48}
49
50/* Handle interrupts from the SRM, assuming no additional weirdness.  */
51static struct hw_interrupt_type srm_irq_type = {
52	.typename	= "SRM",
53	.startup	= srm_startup_irq,
54	.shutdown	= srm_disable_irq,
55	.enable		= srm_enable_irq,
56	.disable	= srm_disable_irq,
57	.ack		= srm_disable_irq,
58	.end		= srm_end_irq,
59};
60
61void __init
62init_srm_irqs(long max, unsigned long ignore_mask)
63{
64	long i;
65
66	for (i = 16; i < max; ++i) {
67		if (i < 64 && ((ignore_mask >> i) & 1))
68			continue;
69		irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
70		irq_desc[i].chip = &srm_irq_type;
71	}
72}
73
74void
75srm_device_interrupt(unsigned long vector)
76{
77	int irq = (vector - 0x800) >> 4;
78	handle_irq(irq);
79}
80