2 * arch/arm/plat-orion/irq.c
4 * Marvell Orion SoC IRQ handling.
6 * This file is licensed under the terms of the GNU General Public
7 * License version 2. This program is licensed "as is" without any
8 * warranty of any kind, whether express or implied.
11 #include <linux/kernel.h>
12 #include <linux/init.h>
13 #include <linux/irq.h>
17 static void orion_irq_mask(u32 irq)
19 void __iomem *maskaddr = get_irq_chip_data(irq);
22 mask = readl(maskaddr);
23 mask &= ~(1 << (irq & 31));
24 writel(mask, maskaddr);
27 static void orion_irq_unmask(u32 irq)
29 void __iomem *maskaddr = get_irq_chip_data(irq);
32 mask = readl(maskaddr);
33 mask |= 1 << (irq & 31);
34 writel(mask, maskaddr);
37 static struct irq_chip orion_irq_chip = {
39 .mask = orion_irq_mask,
40 .mask_ack = orion_irq_mask,
41 .unmask = orion_irq_unmask,
44 void __init orion_irq_init(unsigned int irq_start, void __iomem *maskaddr)
49 * Mask all interrupts initially.
54 * Register IRQ sources.
56 for (i = 0; i < 32; i++) {
57 unsigned int irq = irq_start + i;
59 set_irq_chip(irq, &orion_irq_chip);
60 set_irq_chip_data(irq, maskaddr);
61 set_irq_handler(irq, handle_level_irq);
62 irq_desc[irq].status |= IRQ_LEVEL;
63 set_irq_flags(irq, IRQF_VALID);