2 * Author: Kumar Gala <galak@kernel.crashing.org>
4 * Copyright 2009 Freescale Semiconductor Inc.
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.
12 #include <linux/stddef.h>
13 #include <linux/kernel.h>
14 #include <linux/smp.h>
15 #include <linux/threads.h>
16 #include <linux/hardirq.h>
18 #include <asm/dbell.h>
19 #include <asm/irq_regs.h>
22 void doorbell_setup_this_cpu(void)
24 unsigned long tag
= mfspr(SPRN_PIR
) & 0x3fff;
26 smp_muxed_ipi_set_data(smp_processor_id(), tag
);
29 void doorbell_cause_ipi(int cpu
, unsigned long data
)
31 ppc_msgsnd(PPC_DBELL
, 0, data
);
34 void doorbell_exception(struct pt_regs
*regs
)
36 struct pt_regs
*old_regs
= set_irq_regs(regs
);
40 may_hard_irq_enable();
45 set_irq_regs(old_regs
);
47 #else /* CONFIG_SMP */
48 void doorbell_exception(struct pt_regs
*regs
)
50 printk(KERN_WARNING
"Received doorbell on non-smp system\n");
52 #endif /* CONFIG_SMP */