release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/bcm47xx/irq.c

   1 /*
   2  *  Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org>
   3  *
   4  *  This program is free software; you can redistribute  it and/or modify it
   5  *  under  the terms of  the GNU General  Public License as published by the
   6  *  Free Software Foundation;  either version 2 of the  License, or (at your
   7  *  option) any later version.
   8  *
   9  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  10  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  11  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  12  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  13  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  14  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  15  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  16  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  17  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  18  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  19  *
  20  *  You should have received a copy of the  GNU General Public License along
  21  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  22  *  675 Mass Ave, Cambridge, MA 02139, USA.
  23  */
  24
  25 #include <linux/types.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/irq.h>
  28 #include <asm/irq_cpu.h>
  29
  30 void plat_irq_dispatch(void)
  31 {
  32         u32 cause;
  33
  34         cause = read_c0_cause() & read_c0_status() & CAUSEF_IP;
  35
  36         clear_c0_status(cause);
  37
  38         if (cause & CAUSEF_IP7)
  39                 do_IRQ(7);
  40         if (cause & CAUSEF_IP2)
  41                 do_IRQ(2);
  42         if (cause & CAUSEF_IP3)
  43                 do_IRQ(3);
  44         if (cause & CAUSEF_IP4)
  45                 do_IRQ(4);
  46         if (cause & CAUSEF_IP5)
  47                 do_IRQ(5);
  48         if (cause & CAUSEF_IP6)
  49                 do_IRQ(6);
  50 }
  51
  52 void __init arch_init_irq(void)
  53 {
  54         mips_cpu_irq_init();
  55 }