arch/arm/mach-kirkwood/include/mach/entry-macro.S

   1 /*
   2  * arch/arm/mach-kirkwood/include/mach/entry-macro.S
   3  *
   4  * Low-level IRQ helper macros for Marvell Kirkwood platforms
   5  *
   6  * This file is licensed under the terms of the GNU General Public
   7  * License version 2.  This program is licensed "as is" without any
   8  * warranty of any kind, whether express or implied.
   9  */
  10
  11 #include <mach/bridge-regs.h>
  12
  13         .macro  get_irqnr_preamble, base, tmp
  14         ldr     \base, =IRQ_VIRT_BASE
  15         .endm
  16
  17         .macro  get_irqnr_and_base, irqnr, irqstat, base, tmp
  18         @ check low interrupts
  19         ldr     \irqstat, [\base, #IRQ_CAUSE_LOW_OFF]
  20         ldr     \tmp, [\base, #IRQ_MASK_LOW_OFF]
  21         mov     \irqnr, #31
  22         ands    \irqstat, \irqstat, \tmp
  23         bne     1001f
  24
  25         @ if no low interrupts set, check high interrupts
  26         ldr     \irqstat, [\base, #IRQ_CAUSE_HIGH_OFF]
  27         ldr     \tmp, [\base, #IRQ_MASK_HIGH_OFF]
  28         mov     \irqnr, #63
  29         ands    \irqstat, \irqstat, \tmp
  30
  31         @ find first active interrupt source
  32 1001:   clzne   \irqstat, \irqstat
  33         subne   \irqnr, \irqnr, \irqstat
  34         .endm