arch/arm/mach-shmobile/entry-intc.S

   1 /*
   2  * ARM Interrupt demux handler using INTC
   3  *
   4  * Copyright (C) 2010 Magnus Damm
   5  * Copyright (C) 2008 Renesas Solutions Corp.
   6  *
   7  * This file is licensed under  the terms of the GNU General Public
   8  * License version 2. This program is licensed "as is" without any
   9  * warranty of any kind, whether express or implied.
  10  */
  11
  12 #include <asm/entry-macro-multi.S>
  13
  14 #define INTCA_BASE      0xe6980000
  15 #define INTFLGA_OFFS    0x00000018 /* accept pending interrupt */
  16 #define INTEVTA_OFFS    0x00000020 /* vector number of accepted interrupt */
  17 #define INTLVLA_OFFS    0x00000030 /* priority level of accepted interrupt */
  18 #define INTLVLB_OFFS    0x00000034 /* previous priority level */
  19
  20         .macro  get_irqnr_preamble, base, tmp
  21         ldr     \base, =INTCA_BASE
  22         .endm
  23
  24         .macro  get_irqnr_and_base, irqnr, irqstat, base, tmp
  25         /* The single INTFLGA read access below results in the following:
  26          *
  27          * 1. INTLVLB is updated with old priority value from INTLVLA
  28          * 2. Highest priority interrupt is accepted
  29          * 3. INTLVLA is updated to contain priority of accepted interrupt
  30          * 4. Accepted interrupt vector is stored in INTFLGA and INTEVTA
  31          */
  32         ldr     \irqnr, [\base, #INTFLGA_OFFS]
  33
  34         /* Restore INTLVLA with the value saved in INTLVLB.
  35          * This is required to support interrupt priorities properly.
  36          */
  37         ldrb    \tmp, [\base, #INTLVLB_OFFS]
  38         strb    \tmp, [\base, #INTLVLA_OFFS]
  39
  40         /* Handle invalid vector number case */
  41         cmp     \irqnr, #0
  42         beq     1000f
  43
  44         /* Convert vector to irq number, same as the evt2irq() macro */
  45         lsr     \irqnr, \irqnr, #0x5
  46         subs    \irqnr, \irqnr, #16
  47
  48 1000:
  49         .endm
  50
  51         .macro  test_for_ipi, irqnr, irqstat, base, tmp
  52         .endm
  53
  54         arch_irq_handler shmobile_handle_irq_intc