arch/arm/mach-at91/include/mach/entry-macro.S

   1 /*
   2  * arch/arm/mach-at91/include/mach/entry-macro.S
   3  *
   4  *  Copyright (C) 2003-2005 SAN People
   5  *
   6  * Low-level IRQ helper macros for AT91RM9200 platforms
   7  *
   8  * This file is licensed under the terms of the GNU General Public
   9  * License version 2. This program is licensed "as is" without any
  10  * warranty of any kind, whether express or implied.
  11  */
  12
  13 #include <mach/hardware.h>
  14 #include <mach/at91_aic.h>
  15
  16         .macro  get_irqnr_preamble, base, tmp
  17         ldr     \base, =at91_aic_base           @ base virtual address of AIC peripheral
  18         ldr     \base, [\base]
  19         .endm
  20
  21         .macro  get_irqnr_and_base, irqnr, irqstat, base, tmp
  22         ldr     \irqnr, [\base, #AT91_AIC_IVR]          @ read IRQ vector register: de-asserts nIRQ to processor (and clears interrupt)
  23         ldr     \irqstat, [\base, #AT91_AIC_ISR]        @ read interrupt source number
  24         teq     \irqstat, #0                            @ ISR is 0 when no current interrupt, or spurious interrupt
  25         streq   \tmp, [\base, #AT91_AIC_EOICR]          @ not going to be handled further, then ACK it now.
  26         .endm
  27