blob: d63e93e1e8bf885295a26e4ec154c836a96c3d64 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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. */
Thomas Gleixner44377f62009-06-16 15:33:25 -070051static struct irq_chip srm_irq_type = {
Thomas Gleixner8ab12212009-11-30 22:51:31 -050052 .name = "SRM",
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 .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
Ivan Kokshaysky70b66cbf2009-01-15 13:51:17 -080066 if (NR_IRQS <= 16)
67 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 for (i = 16; i < max; ++i) {
69 if (i < 64 && ((ignore_mask >> i) & 1))
70 continue;
71 irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
Ingo Molnard1bef4e2006-06-29 02:24:36 -070072 irq_desc[i].chip = &srm_irq_type;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 }
74}
75
76void
Al Viro7ca560532006-10-08 14:36:08 +010077srm_device_interrupt(unsigned long vector)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078{
79 int irq = (vector - 0x800) >> 4;
Al Viro3dbb8c62006-10-08 14:37:32 +010080 handle_irq(irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081}