target/linux/ramips/files/arch/mips/ralink/rt288x/irq.c

   1 /*
   2  *  Ralink RT288x SoC specific interrupt handling
   3  *
   4  *  Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
   5  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   6  *
   7  *  This program is free software; you can redistribute it and/or modify it
   8  *  under the terms of the GNU General Public License version 2 as published
   9  *  by the Free Software Foundation.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/irq.h>
  16
  17 #include <asm/irq_cpu.h>
  18 #include <asm/mipsregs.h>
  19
  20 #include <asm/mach-ralink/common.h>
  21 #include <asm/mach-ralink/rt288x.h>
  22 #include <asm/mach-ralink/rt288x_regs.h>
  23
  24 static void rt288x_intc_irq_dispatch(void)
  25 {
  26         u32 pending;
  27
  28         pending = ramips_intc_get_status();
  29
  30         if (pending & RT2880_INTC_INT_TIMER0)
  31                 do_IRQ(RT2880_INTC_IRQ_TIMER0);
  32
  33         else if (pending & RT2880_INTC_INT_TIMER1)
  34                 do_IRQ(RT2880_INTC_IRQ_TIMER1);
  35
  36         else if (pending & RT2880_INTC_INT_UART0)
  37                 do_IRQ(RT2880_INTC_IRQ_UART0);
  38
  39         else if (pending & RT2880_INTC_INT_PCM)
  40                 do_IRQ(RT2880_INTC_IRQ_PCM);
  41
  42         else if (pending & RT2880_INTC_INT_UART1)
  43                 do_IRQ(RT2880_INTC_IRQ_UART1);
  44
  45         /* TODO: handle PIO interrupts as well */
  46
  47         else
  48                 spurious_interrupt();
  49 }
  50
  51 asmlinkage void plat_irq_dispatch(void)
  52 {
  53         unsigned long pending;
  54
  55         pending = read_c0_status() & read_c0_cause() & ST0_IM;
  56
  57         if (pending & STATUSF_IP7)
  58                 do_IRQ(RT288X_CPU_IRQ_COUNTER);
  59
  60         else if (pending & STATUSF_IP4)
  61                 do_IRQ(RT288X_CPU_IRQ_PCI);
  62
  63         else if (pending & STATUSF_IP5)
  64                 do_IRQ(RT288X_CPU_IRQ_FE);
  65
  66         else if (pending & STATUSF_IP6)
  67                 do_IRQ(RT288X_CPU_IRQ_WNIC);
  68
  69         else if (pending & STATUSF_IP2)
  70                 rt288x_intc_irq_dispatch();
  71
  72         else
  73                 spurious_interrupt();
  74 }
  75
  76 void __init arch_init_irq(void)
  77 {
  78         mips_cpu_irq_init();
  79         ramips_intc_irq_init(RT2880_INTC_BASE, RT288X_CPU_IRQ_INTC,
  80                              RT288X_INTC_IRQ_BASE);
  81 }