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[mv-sheeva.git] / arch / powerpc / kernel / dbell.c
1 /*
2  * Author: Kumar Gala <galak@kernel.crashing.org>
3  *
4  * Copyright 2009 Freescale Semiconductor Inc.
5  *
6  * This program is free software; you can redistribute  it and/or modify it
7  * under  the terms of  the GNU General  Public License as published by the
8  * Free Software Foundation;  either version 2 of the  License, or (at your
9  * option) any later version.
10  */
11
12 #include <linux/stddef.h>
13 #include <linux/kernel.h>
14 #include <linux/smp.h>
15 #include <linux/threads.h>
16
17 #include <asm/dbell.h>
18
19 #ifdef CONFIG_SMP
20 unsigned long dbell_smp_message[NR_CPUS];
21
22 void smp_dbell_message_pass(int target, int msg)
23 {
24         int i;
25
26         if(target < NR_CPUS) {
27                 set_bit(msg, &dbell_smp_message[target]);
28                 ppc_msgsnd(PPC_DBELL, 0, target);
29         }
30         else if(target == MSG_ALL_BUT_SELF) {
31                 for_each_online_cpu(i) {
32                         if (i == smp_processor_id())
33                                 continue;
34                         set_bit(msg, &dbell_smp_message[i]);
35                         ppc_msgsnd(PPC_DBELL, 0, i);
36                 }
37         }
38         else { /* target == MSG_ALL */
39                 for_each_online_cpu(i)
40                         set_bit(msg, &dbell_smp_message[i]);
41                 ppc_msgsnd(PPC_DBELL, PPC_DBELL_MSG_BRDCAST, 0);
42         }
43 }
44 #endif