arch/arm/mach-shmobile/include/mach/entry-macro.S

   1 /*
   2  * Copyright (C) 2010 Magnus Damm
   3  * Copyright (C) 2008 Renesas Solutions Corp.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; version 2 of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include <mach/irqs.h>
  19
  20 #define INTCA_BASE      0xe6980000
  21 #define INTFLGA_OFFS    0x00000018 /* accept pending interrupt */
  22 #define INTEVTA_OFFS    0x00000020 /* vector number of accepted interrupt */
  23 #define INTLVLA_OFFS    0x00000030 /* priority level of accepted interrupt */
  24 #define INTLVLB_OFFS    0x00000034 /* previous priority level */
  25
  26         .macro  disable_fiq
  27         .endm
  28
  29         .macro  get_irqnr_preamble, base, tmp
  30         ldr     \base, =INTCA_BASE
  31         .endm
  32
  33         .macro  arch_ret_to_user, tmp1, tmp2
  34         .endm
  35
  36         .macro  get_irqnr_and_base, irqnr, irqstat, base, tmp
  37         /* The single INTFLGA read access below results in the following:
  38          *
  39          * 1. INTLVLB is updated with old priority value from INTLVLA
  40          * 2. Highest priority interrupt is accepted
  41          * 3. INTLVLA is updated to contain priority of accepted interrupt
  42          * 4. Accepted interrupt vector is stored in INTFLGA and INTEVTA
  43          */
  44         ldr     \irqnr, [\base, #INTFLGA_OFFS]
  45
  46         /* Restore INTLVLA with the value saved in INTLVLB.
  47          * This is required to support interrupt priorities properly.
  48          */
  49         ldrb    \tmp, [\base, #INTLVLB_OFFS]
  50         strb    \tmp, [\base, #INTLVLA_OFFS]
  51
  52         /* Handle invalid vector number case */
  53         cmp     \irqnr, #0
  54         beq     1000f
  55
  56         /* Convert vector to irq number, same as the evt2irq() macro */
  57         lsr     \irqnr, \irqnr, #0x5
  58         subs    \irqnr, \irqnr, #16
  59
  60 1000:
  61         .endm