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 
unmask_rm7k_irq(struct irq_data * d)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 
mask_rm7k_irq(struct irq_data * d)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 
rm7k_cpu_irq_init(void)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