release/src-rt-6.x/linux/linux-2.6/include/asm-arm/arch-at91/entry-macro.S

   1 /*
   2  * include/asm-arm/arch-at91/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 <asm/hardware.h>
  14 #include <asm/arch/at91_aic.h>
  15
  16         .macro  disable_fiq
  17         .endm
  18
  19         .macro  get_irqnr_preamble, base, tmp
  20         .endm
  21
  22         .macro  arch_ret_to_user, tmp1, tmp2
  23         .endm
  24
  25         .macro  get_irqnr_and_base, irqnr, irqstat, base, tmp
  26         ldr     \base, =(AT91_VA_BASE_SYS + AT91_AIC)           @ base virtual address of AIC peripheral
  27         ldr     \irqnr, [\base, #(AT91_AIC_IVR - AT91_AIC)]     @ read IRQ vector register: de-asserts nIRQ to processor (and clears interrupt)
  28         ldr     \irqstat, [\base, #(AT91_AIC_ISR - AT91_AIC)]   @ read interrupt source number
  29         teq     \irqstat, #0                                    @ ISR is 0 when no current interrupt, or spurious interrupt
  30         streq   \tmp, [\base, #(AT91_AIC_EOICR - AT91_AIC)]     @ not going to be handled further, then ACK it now.
  31         .endm
  32