2 * Moschip MCS814x generic interrupt controller routines
4 * Copyright (C) 2012, Florian Fainelli <florian@openwrt.org>
6 * Licensed under the GPLv2
8 #include <linux/init.h>
12 #include <linux/of_address.h>
13 #include <linux/irqdomain.h>
15 #include <asm/exception.h>
16 #include <asm/mach/irq.h>
17 #include <mach/hardware.h>
19 void __iomem
*mcs814x_intc_base
;
21 static void __init
mcs814x_alloc_gc(void __iomem
*base
, unsigned int irq_start
,
24 struct irq_chip_generic
*gc
;
25 struct irq_chip_type
*ct
;
27 gc
= irq_alloc_generic_chip("mcs814x-intc", 1,
28 irq_start
, base
, handle_level_irq
);
30 panic("unable to allocate generic irq chip");
33 ct
->chip
.irq_ack
= irq_gc_unmask_enable_reg
;
34 ct
->chip
.irq_mask
= irq_gc_mask_clr_bit
;
35 ct
->chip
.irq_unmask
= irq_gc_mask_set_bit
;
36 ct
->regs
.mask
= MCS814X_IRQ_MASK
;
37 ct
->regs
.enable
= MCS814X_IRQ_ICR
;
39 irq_setup_generic_chip(gc
, IRQ_MSK(num
), IRQ_GC_INIT_MASK_CACHE
,
42 /* Clear all interrupts */
43 __raw_writel(0xffffffff, base
+ MCS814X_IRQ_ICR
);
46 static const struct of_device_id mcs814x_intc_ids
[] = {
47 { .compatible
= "moschip,mcs814x-intc" },
51 void __init
mcs814x_of_irq_init(void)
53 struct device_node
*np
;
55 np
= of_find_matching_node(NULL
, mcs814x_intc_ids
);
57 panic("unable to find compatible intc node in dtb\n");
59 mcs814x_intc_base
= of_iomap(np
, 0);
60 if (!mcs814x_intc_base
)
61 panic("unable to map intc cpu registers\n");
63 irq_domain_add_simple(np
, 0);
67 mcs814x_alloc_gc(mcs814x_intc_base
, 0, 32);