2 * arch/arm/mach-kirkwood/irq.c
4 * Kirkwood 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.
10 #include <asm/exception.h>
11 #include <linux/gpio.h>
12 #include <linux/kernel.h>
13 #include <linux/irq.h>
15 #include <mach/bridge-regs.h>
16 #include <plat/orion-gpio.h>
20 static int __initdata gpio0_irqs[4] = {
21 IRQ_KIRKWOOD_GPIO_LOW_0_7,
22 IRQ_KIRKWOOD_GPIO_LOW_8_15,
23 IRQ_KIRKWOOD_GPIO_LOW_16_23,
24 IRQ_KIRKWOOD_GPIO_LOW_24_31,
27 static int __initdata gpio1_irqs[4] = {
28 IRQ_KIRKWOOD_GPIO_HIGH_0_7,
29 IRQ_KIRKWOOD_GPIO_HIGH_8_15,
30 IRQ_KIRKWOOD_GPIO_HIGH_16_23,
34 #ifdef CONFIG_MULTI_IRQ_HANDLER
36 * Compiling with both non-DT and DT support enabled, will
37 * break asm irq handler used by non-DT boards. Therefore,
38 * we provide a C-style irq handler even for non-DT boards,
39 * if MULTI_IRQ_HANDLER is set.
42 static void __iomem *kirkwood_irq_base = IRQ_VIRT_BASE;
45 __exception_irq_entry kirkwood_legacy_handle_irq(struct pt_regs *regs)
49 stat = readl_relaxed(kirkwood_irq_base + IRQ_CAUSE_LOW_OFF);
50 stat &= readl_relaxed(kirkwood_irq_base + IRQ_MASK_LOW_OFF);
52 unsigned int hwirq = __fls(stat);
53 handle_IRQ(hwirq, regs);
56 stat = readl_relaxed(kirkwood_irq_base + IRQ_CAUSE_HIGH_OFF);
57 stat &= readl_relaxed(kirkwood_irq_base + IRQ_MASK_HIGH_OFF);
59 unsigned int hwirq = 32 + __fls(stat);
60 handle_IRQ(hwirq, regs);
66 void __init kirkwood_init_irq(void)
68 orion_irq_init(0, IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF);
69 orion_irq_init(32, IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF);
71 #ifdef CONFIG_MULTI_IRQ_HANDLER
72 set_handle_irq(kirkwood_legacy_handle_irq);
76 * Initialize gpiolib for GPIOs 0-49.
78 orion_gpio_init(NULL, 0, 32, GPIO_LOW_VIRT_BASE, 0,
79 IRQ_KIRKWOOD_GPIO_START, gpio0_irqs);
80 orion_gpio_init(NULL, 32, 18, GPIO_HIGH_VIRT_BASE, 0,
81 IRQ_KIRKWOOD_GPIO_START + 32, gpio1_irqs);