git.oblomov.eu Git - linux-2.6/blob - include/asm-arm/arch-h720x/entry-macro.S

   1 /*
   2  * include/asm-arm/arch-h720x/entry-macro.S
   3  *
   4  * Low-level IRQ helper macros for Hynix HMS720x 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_preamble, base, tmp
  15                 .endm
  16
  17                 .macro  arch_ret_to_user, tmp1, tmp2
  18                 .endm
  19
  20                 .macro  get_irqnr_and_base, irqnr, irqstat, base, tmp
  21 #if defined (CONFIG_CPU_H7201) || defined (CONFIG_CPU_H7202)
  22                 @ we could use the id register on H7202, but this is not
  23                 @ properly updated when we come back from asm_do_irq
  24                 @ without a previous return from interrupt
  25                 @ (see loops below in irq_svc, irq_usr)
  26                 @ We see unmasked pending ints only, as the masked pending ints
  27                 @ are not visible here
  28
  29                 mov     \base, #0xf0000000             @ base register
  30                 orr     \base, \base, #0x24000         @ irqbase
  31                 ldr     \irqstat, [\base, #0x04]        @ get interrupt status
  32 #if defined (CONFIG_CPU_H7201)
  33                 ldr     \tmp, =0x001fffff
  34 #else
  35                 mvn     \tmp, #0xc0000000
  36 #endif
  37                 and     \irqstat, \irqstat, \tmp        @ mask out unused ints
  38                 mov     \irqnr, #0
  39
  40                 mov     \tmp, #0xff00
  41                 orr     \tmp, \tmp, #0xff
  42                 tst     \irqstat, \tmp
  43                 addeq   \irqnr, \irqnr, #16
  44                 moveq   \irqstat, \irqstat, lsr #16
  45                 tst     \irqstat, #255
  46                 addeq   \irqnr, \irqnr, #8
  47                 moveq   \irqstat, \irqstat, lsr #8
  48                 tst     \irqstat, #15
  49                 addeq   \irqnr, \irqnr, #4
  50                 moveq   \irqstat, \irqstat, lsr #4
  51                 tst     \irqstat, #3
  52                 addeq   \irqnr, \irqnr, #2
  53                 moveq   \irqstat, \irqstat, lsr #2
  54                 tst     \irqstat, #1
  55                 addeq   \irqnr, \irqnr, #1
  56                 moveq   \irqstat, \irqstat, lsr #1
  57                 tst     \irqstat, #1                   @ bit 0 should be set
  58                 .endm
  59
  60                 .macro  irq_prio_table
  61                 .endm
  62
  63 #else
  64 #error hynix processor selection missmatch
  65 #endif
  66