arch/mips/tx4938/common/irq.c

   1 /*
   2  * linux/arch/mips/tx4938/common/irq.c
   3  *
   4  * Common tx4938 irq handler
   5  * Copyright (C) 2000-2001 Toshiba Corporation
   6  *
   7  * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
   8  * terms of the GNU General Public License version 2. This program is
   9  * licensed "as is" without any warranty of any kind, whether express
  10  * or implied.
  11  *
  12  * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
  13  */
  14 #include <linux/init.h>
  15 #include <linux/interrupt.h>
  16 #include <asm/irq_cpu.h>
  17 #include <asm/mipsregs.h>
  18 #include <asm/tx4938/rbtx4938.h>
  19
  20 void __init
  21 tx4938_irq_init(void)
  22 {
  23         mips_cpu_irq_init();
  24         txx9_irq_init(TX4938_IRC_REG);
  25         set_irq_chained_handler(TX4938_IRQ_NEST_PIC_ON_CP0, handle_simple_irq);
  26 }
  27
  28 int toshiba_rbtx4938_irq_nested(int irq);
  29
  30 asmlinkage void plat_irq_dispatch(void)
  31 {
  32         unsigned int pending = read_c0_cause() & read_c0_status();
  33
  34         if (pending & STATUSF_IP7)
  35                 do_IRQ(TX4938_IRQ_CPU_TIMER);
  36         else if (pending & STATUSF_IP2) {
  37                 int irq = txx9_irq();
  38                 if (irq == TX4938_IRQ_PIC_BEG + TX4938_IR_INT(0))
  39                         irq = toshiba_rbtx4938_irq_nested(irq);
  40                 if (irq >= 0)
  41                         do_IRQ(irq);
  42                 else
  43                         spurious_interrupt();
  44         } else if (pending & STATUSF_IP1)
  45                 do_IRQ(TX4938_IRQ_USER1);
  46         else if (pending & STATUSF_IP0)
  47                 do_IRQ(TX4938_IRQ_USER0);
  48 }