include/asm-arm/arch-ixp2000/entry-macro.S

   1 /*
   2  * include/asm-arm/arch-ixp2000/entry-macro.S
   3  *
   4  * Low-level IRQ helper macros for IXP2000-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
  16                 mov     \irqnr, #0x0              @clear out irqnr as default
  17                 mov     \base, #0xfe000000
  18                 orr     \base, \base, #0x00e00000
  19                 orr     \base, \base, #0x08
  20                 ldr     \irqstat, [\base]         @ get interrupts
  21
  22                 cmp     \irqstat, #0
  23                 beq     1001f
  24
  25                 clz     \irqnr, \irqstat
  26                 mov     \base, #31
  27                 subs    \irqnr, \base, \irqnr
  28
  29                 /*
  30                  * We handle PCIA and PCIB here so we don't have an
  31                  * extra layer of code just to check these two bits.
  32                  */
  33                 cmp     \irqnr, #IRQ_IXP2000_PCI
  34                 bne     1001f
  35
  36                 mov     \base, #0xfe000000
  37                 orr     \base, \base, #0x00c00000
  38                 orr     \base, \base, #0x00000100
  39                 orr     \base, \base, #0x00000058
  40                 ldr     \irqstat, [\base]
  41
  42                 mov     \tmp, #(1<<26)
  43                 tst     \irqstat, \tmp
  44                 movne   \irqnr, #IRQ_IXP2000_PCIA
  45                 bne     1001f
  46
  47                 mov     \tmp, #(1<<27)
  48                 tst     \irqstat, \tmp
  49                 movne   \irqnr, #IRQ_IXP2000_PCIB
  50
  51 1001:
  52                 .endm
  53