arch/mips/kernel/irq-rm7000.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2003 Ralf Baechle
   4  *
   5  * Handler for RM7000 extended interrupts.  These are a non-standard
   6  * feature so we handle them separately from standard interrupts.
   7  */
   8 #include <linux/init.h>
   9 #include <linux/interrupt.h>
  10 #include <linux/irq.h>
  11 #include <linux/kernel.h>
  12
  13 #include <asm/irq_cpu.h>
  14 #include <asm/mipsregs.h>
  15
  16 static inline void unmask_rm7k_irq(struct irq_data *d)
  17 {
  18         set_c0_intcontrol(0x100 << (d->irq - RM7K_CPU_IRQ_BASE));
  19 }
  20
  21 static inline void mask_rm7k_irq(struct irq_data *d)
  22 {
  23         clear_c0_intcontrol(0x100 << (d->irq - RM7K_CPU_IRQ_BASE));
  24 }
  25
  26 static struct irq_chip rm7k_irq_controller = {
  27         .name = "RM7000",
  28         .irq_ack = mask_rm7k_irq,
  29         .irq_mask = mask_rm7k_irq,
  30         .irq_mask_ack = mask_rm7k_irq,
  31         .irq_unmask = unmask_rm7k_irq,
  32         .irq_eoi = unmask_rm7k_irq
  33 };
  34
  35 void __init rm7k_cpu_irq_init(void)
  36 {
  37         int base = RM7K_CPU_IRQ_BASE;
  38         int i;
  39
  40         clear_c0_intcontrol(0x00000f00);                /* Mask all */
  41
  42         for (i = base; i < base + 4; i++)
  43                 irq_set_chip_and_handler(i, &rm7k_irq_controller,
  44                                          handle_percpu_irq);
  45 }