release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-ixp2000/include/mach/entry-macro.S

   1 /*
   2  * arch/arm/mach-ixp2000/include/mach/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 #include <mach/irqs.h>
  11
  12                 .macro  disable_fiq
  13                 .endm
  14
  15                 .macro  get_irqnr_preamble, base, tmp
  16                 .endm
  17
  18                 .macro  arch_ret_to_user, tmp1, tmp2
  19                 .endm
  20
  21                 .macro  get_irqnr_and_base, irqnr, irqstat, base, tmp
  22
  23                 mov     \irqnr, #0x0              @clear out irqnr as default
  24                 mov     \base, #0xfe000000
  25                 orr     \base, \base, #0x00e00000
  26                 orr     \base, \base, #0x08
  27                 ldr     \irqstat, [\base]         @ get interrupts
  28
  29                 cmp     \irqstat, #0
  30                 beq     1001f
  31
  32                 clz     \irqnr, \irqstat
  33                 mov     \base, #31
  34                 subs    \irqnr, \base, \irqnr
  35
  36                 /*
  37                  * We handle PCIA and PCIB here so we don't have an
  38                  * extra layer of code just to check these two bits.
  39                  */
  40                 cmp     \irqnr, #IRQ_IXP2000_PCI
  41                 bne     1001f
  42
  43                 mov     \base, #0xfe000000
  44                 orr     \base, \base, #0x00c00000
  45                 orr     \base, \base, #0x00000100
  46                 orr     \base, \base, #0x00000058
  47                 ldr     \irqstat, [\base]
  48
  49                 mov     \tmp, #(1<<26)
  50                 tst     \irqstat, \tmp
  51                 movne   \irqnr, #IRQ_IXP2000_PCIA
  52                 bne     1001f
  53
  54                 mov     \tmp, #(1<<27)
  55                 tst     \irqstat, \tmp
  56                 movne   \irqnr, #IRQ_IXP2000_PCIB
  57
  58 1001:
  59                 .endm