arch/arc/kernel/irq.c

   1 /*
   2  * Copyright (C) 2011-12 Synopsys, Inc. (www.synopsys.com)
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  *
   8  */
   9
  10 #include <linux/interrupt.h>
  11 #include <linux/irqchip.h>
  12 #include <asm/mach_desc.h>
  13 #include <asm/smp.h>
  14
  15 /*
  16  * Late Interrupt system init called from start_kernel for Boot CPU only
  17  *
  18  * Since slab must already be initialized, platforms can start doing any
  19  * needed request_irq( )s
  20  */
  21 void __init init_IRQ(void)
  22 {
  23         /*
  24          * process the entire interrupt tree in one go
  25          * Any external intc will be setup provided DT chains them
  26          * properly
  27          */
  28         irqchip_init();
  29
  30 #ifdef CONFIG_SMP
  31         /* a SMP H/w block could do IPI IRQ request here */
  32         if (plat_smp_ops.init_per_cpu)
  33                 plat_smp_ops.init_per_cpu(smp_processor_id());
  34
  35         if (machine_desc->init_per_cpu)
  36                 machine_desc->init_per_cpu(smp_processor_id());
  37 #endif
  38 }
  39
  40 /*
  41  * "C" Entry point for any ARC ISR, called from low level vector handler
  42  * @irq is the vector number read from ICAUSE reg of on-chip intc
  43  */
  44 void arch_do_IRQ(unsigned int hwirq, struct pt_regs *regs)
  45 {
  46         handle_domain_irq(NULL, hwirq, regs);
  47 }