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Linux/arch/mips/kernel/irq-rm7000.c

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  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 }
 46 

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