arch/arm/mach-orion5x/irq.c

Source file repositories/reference/linux-study-clean/arch/arm/mach-orion5x/irq.c

File Facts

System
Linux kernel
Corpus path
arch/arm/mach-orion5x/irq.c
Extension
.c
Size
1086 bytes
Lines
52
Domain
Architecture Layer
Bucket
arch/arm
Inferred role
Architecture Layer: implementation source
Status
source implementation candidate

Why This File Exists

CPU and platform-specific kernel glue: boot entry, traps, syscall entry, interrupts, page tables, context switch, and low-level barriers.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * arch/arm/mach-orion5x/irq.c
 *
 * Core IRQ functions for Marvell Orion System On Chip
 *
 * Maintainer: Tzachi Perelstein <tzachi@marvell.com>
 */
#include <linux/gpio.h>
#include <linux/kernel.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <plat/orion-gpio.h>
#include <plat/irq.h>
#include <asm/exception.h>
#include "bridge-regs.h"
#include "common.h"

static int __initdata gpio0_irqs[4] = {
	IRQ_ORION5X_GPIO_0_7,
	IRQ_ORION5X_GPIO_8_15,
	IRQ_ORION5X_GPIO_16_23,
	IRQ_ORION5X_GPIO_24_31,
};

static asmlinkage void
__exception_irq_entry orion5x_legacy_handle_irq(struct pt_regs *regs)
{
	u32 stat;

	stat = readl_relaxed(MAIN_IRQ_CAUSE);
	stat &= readl_relaxed(MAIN_IRQ_MASK);
	if (stat) {
		unsigned int hwirq = 1 + __fls(stat);
		handle_IRQ(hwirq, regs);
		return;
	}
}

void __init orion5x_init_irq(void)
{
	orion_irq_init(1, MAIN_IRQ_MASK);

	set_handle_irq(orion5x_legacy_handle_irq);

	/*
	 * Initialize gpiolib for GPIOs 0-31.
	 */
	orion_gpio_init(0, 32, GPIO_VIRT_BASE, 0,
			IRQ_ORION5X_GPIO_START, gpio0_irqs);
}

Annotation

Implementation Notes