arch/arm/plat-mxc/gic.c

   1 /*
   2  * Copyright 2011 Freescale Semiconductor, Inc.
   3  * Copyright 2011 Linaro Ltd.
   4  *
   5  * The code contained herein is licensed under the GNU General Public
   6  * License. You may obtain a copy of the GNU General Public License
   7  * Version 2 or later at the following locations:
   8  *
   9  * http://www.opensource.org/licenses/gpl-license.html
  10  * http://www.gnu.org/copyleft/gpl.html
  11  */
  12
  13 #include <linux/io.h>
  14 #include <asm/exception.h>
  15 #include <asm/localtimer.h>
  16 #include <asm/hardware/gic.h>
  17 #ifdef CONFIG_SMP
  18 #include <asm/smp.h>
  19 #endif
  20
  21 asmlinkage void __exception_irq_entry gic_handle_irq(struct pt_regs *regs)
  22 {
  23         u32 irqstat, irqnr;
  24
  25         do {
  26                 irqstat = readl_relaxed(gic_cpu_base_addr + GIC_CPU_INTACK);
  27                 irqnr = irqstat & 0x3ff;
  28                 if (irqnr == 1023)
  29                         break;
  30
  31                 if (irqnr > 29 && irqnr < 1021)
  32                         handle_IRQ(irqnr, regs);
  33 #ifdef CONFIG_SMP
  34                 else if (irqnr < 16) {
  35                         writel_relaxed(irqstat, gic_cpu_base_addr +
  36                                                 GIC_CPU_EOI);
  37                         handle_IPI(irqnr, regs);
  38                 }
  39 #endif
  40 #ifdef CONFIG_LOCAL_TIMERS
  41                 else if (irqnr == 29) {
  42                         writel_relaxed(irqstat, gic_cpu_base_addr +
  43                                                 GIC_CPU_EOI);
  44                         handle_local_timer(regs);
  45                 }
  46 #endif
  47         } while (1);
  48 }