include/asm-arm/arch-ixp4xx/entry-macro.S

   1 /*
   2  * include/asm-arm/arch-ixp4xx/entry-macro.S
   3  *
   4  * Low-level IRQ helper macros for IXP4xx-based 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                 .macro  disable_fiq
  12                 .endm
  13
  14                 .macro  get_irqnr_and_base, irqnr, irqstat, base, tmp
  15                 ldr     \irqstat, =(IXP4XX_INTC_BASE_VIRT+IXP4XX_ICIP_OFFSET)
  16                 ldr     \irqstat, [\irqstat]            @ get interrupts
  17                 cmp     \irqstat, #0
  18                 beq     1001f                           @ upper IRQ?
  19                 clz     \irqnr, \irqstat
  20                 mov     \base, #31
  21                 sub     \irqnr, \base, \irqnr
  22                 b       1002f                           @ lower IRQ being
  23                                                         @ handled
  24
  25 1001:
  26                 /*
  27                  * IXP465 has an upper IRQ status register
  28                  */
  29 #if defined(CONFIG_CPU_IXP46X)
  30                 ldr     \irqstat, =(IXP4XX_INTC_BASE_VIRT+IXP4XX_ICIP2_OFFSET)
  31                 ldr     \irqstat, [\irqstat]            @ get upper interrupts
  32                 mov     \irqnr, #63
  33                 clz     \irqstat, \irqstat
  34                 cmp     \irqstat, #32
  35                 subne   \irqnr, \irqnr, \irqstat
  36 #endif
  37 1002:
  38                 .endm
  39
  40