target/linux/ramips/files/arch/mips/ralink/rt305x/irq.c

   1 /*
   2  *  Ralink RT305x SoC specific interrupt handling
   3  *
   4  *  Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify it
   7  *  under the terms of the GNU General Public License version 2 as published
   8  *  by the Free Software Foundation.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/irq.h>
  15
  16 #include <asm/irq_cpu.h>
  17 #include <asm/mipsregs.h>
  18
  19 #include <asm/mach-ralink/common.h>
  20 #include <asm/mach-ralink/rt305x.h>
  21 #include <asm/mach-ralink/rt305x_regs.h>
  22
  23 static void rt305x_intc_irq_dispatch(void)
  24 {
  25         u32 pending;
  26
  27         pending = ramips_intc_get_status();
  28
  29         if (pending & RT305X_INTC_INT_TIMER0)
  30                 do_IRQ(RT305X_INTC_IRQ_TIMER0);
  31
  32         else if (pending & RT305X_INTC_INT_TIMER1)
  33                 do_IRQ(RT305X_INTC_IRQ_TIMER1);
  34
  35         else if (pending & RT305X_INTC_INT_UART0)
  36                 do_IRQ(RT305X_INTC_IRQ_UART0);
  37
  38         else if (pending & RT305X_INTC_INT_UART1)
  39                 do_IRQ(RT305X_INTC_IRQ_UART1);
  40
  41         /* TODO: handle PIO interrupts as well */
  42
  43         else
  44                 spurious_interrupt();
  45 }
  46
  47 asmlinkage void plat_irq_dispatch(void)
  48 {
  49         unsigned long pending;
  50
  51         pending = read_c0_status() & read_c0_cause() & ST0_IM;
  52
  53         if (pending & STATUSF_IP7)
  54                 do_IRQ(RT305X_CPU_IRQ_COUNTER);
  55
  56         else if (pending & STATUSF_IP5)
  57                 do_IRQ(RT305X_CPU_IRQ_FE);
  58
  59         else if (pending & STATUSF_IP6)
  60                 do_IRQ(RT305X_CPU_IRQ_WNIC);
  61
  62         else if (pending & STATUSF_IP2)
  63                 rt305x_intc_irq_dispatch();
  64
  65         else
  66                 spurious_interrupt();
  67 }
  68
  69 void __init arch_init_irq(void)
  70 {
  71         mips_cpu_irq_init();
  72         ramips_intc_irq_init(RT305X_INTC_BASE, RT305X_CPU_IRQ_INTC,
  73                              RT305X_INTC_IRQ_BASE);
  74 }