arch/mips/tx4927/common/tx4927_irq.c

   1 /*
   2  * Common tx4927 irq handler
   3  *
   4  * Author: MontaVista Software, Inc.
   5  *         source@mvista.com
   6  *
   7  *  under the terms of the GNU General Public License as published by the
   8  *  Free Software Foundation; either version 2 of the License, or (at your
   9  *  option) any later version.
  10  *
  11  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  12  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  13  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  14  *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  15  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  16  *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  17  *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  18  *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
  19  *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
  20  *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  21  *
  22  *  You should have received a copy of the GNU General Public License along
  23  *  with this program; if not, write to the Free Software Foundation, Inc.,
  24  *  675 Mass Ave, Cambridge, MA 02139, USA.
  25  */
  26 #include <linux/init.h>
  27 #include <linux/interrupt.h>
  28 #include <asm/irq_cpu.h>
  29 #include <asm/mipsregs.h>
  30 #include <asm/tx4927/tx4927.h>
  31 #ifdef CONFIG_TOSHIBA_RBTX4927
  32 #include <asm/tx4927/toshiba_rbtx4927.h>
  33 #endif
  34
  35 void __init tx4927_irq_init(void)
  36 {
  37         mips_cpu_irq_init();
  38         txx9_irq_init(TX4927_IRC_REG);
  39         set_irq_chained_handler(TX4927_IRQ_NEST_PIC_ON_CP0, handle_simple_irq);
  40 }
  41
  42 asmlinkage void plat_irq_dispatch(void)
  43 {
  44         unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM;
  45
  46         if (pending & STATUSF_IP7)                      /* cpu timer */
  47                 do_IRQ(TX4927_IRQ_CPU_TIMER);
  48         else if (pending & STATUSF_IP2) {               /* tx4927 pic */
  49                 int irq = txx9_irq();
  50 #ifdef CONFIG_TOSHIBA_RBTX4927
  51                 if (irq == TX4927_IRQ_NEST_EXT_ON_PIC)
  52                         irq = toshiba_rbtx4927_irq_nested(irq);
  53 #endif
  54                 if (unlikely(irq < 0)) {
  55                         spurious_interrupt();
  56                         return;
  57                 }
  58                 do_IRQ(irq);
  59         } else if (pending & STATUSF_IP0)               /* user line 0 */
  60                 do_IRQ(TX4927_IRQ_USER0);
  61         else if (pending & STATUSF_IP1)                 /* user line 1 */
  62                 do_IRQ(TX4927_IRQ_USER1);
  63         else
  64                 spurious_interrupt();
  65 }