| /* |
| * Author: Kumar Gala <galak@kernel.crashing.org> |
| * |
| * Copyright 2009 Freescale Semiconductor Inc. |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the |
| * Free Software Foundation; either version 2 of the License, or (at your |
| * option) any later version. |
| */ |
| |
| #include <linux/stddef.h> |
| #include <linux/kernel.h> |
| #include <linux/smp.h> |
| #include <linux/threads.h> |
| #include <linux/hardirq.h> |
| |
| #include <asm/dbell.h> |
| #include <asm/irq_regs.h> |
| |
| #ifdef CONFIG_SMP |
| void doorbell_setup_this_cpu(void) |
| { |
| unsigned long tag = mfspr(SPRN_DOORBELL_CPUTAG) & PPC_DBELL_TAG_MASK; |
| |
| smp_muxed_ipi_set_data(smp_processor_id(), tag); |
| } |
| |
| void doorbell_cause_ipi(int cpu, unsigned long data) |
| { |
| /* Order previous accesses vs. msgsnd, which is treated as a store */ |
| mb(); |
| ppc_msgsnd(PPC_DBELL_MSGTYPE, 0, data); |
| } |
| |
| void doorbell_exception(struct pt_regs *regs) |
| { |
| struct pt_regs *old_regs = set_irq_regs(regs); |
| |
| irq_enter(); |
| |
| may_hard_irq_enable(); |
| |
| smp_ipi_demux(); |
| |
| irq_exit(); |
| set_irq_regs(old_regs); |
| } |
| #else /* CONFIG_SMP */ |
| void doorbell_exception(struct pt_regs *regs) |
| { |
| printk(KERN_WARNING "Received doorbell on non-smp system\n"); |
| } |
| #endif /* CONFIG_SMP */ |
| |
