arch/m68k/coldfire/intc-525x.c

Source file repositories/reference/linux-study-clean/arch/m68k/coldfire/intc-525x.c

File Facts

System
Linux kernel
Corpus path
arch/m68k/coldfire/intc-525x.c
Extension
.c
Size
2288 bytes
Lines
92
Domain
Architecture Layer
Bucket
arch/m68k
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

#include <linux/types.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <asm/coldfire.h>
#include <asm/mcfsim.h>

static void intc2_irq_gpio_mask(struct irq_data *d)
{
	u32 imr = mcf_read32(MCFSIM2_GPIOINTENABLE);
	u32 type = irqd_get_trigger_type(d);
	int irq = d->irq - MCF_IRQ_GPIO0;

	if (type & IRQ_TYPE_EDGE_RISING)
		imr &= ~(0x001 << irq);
	if (type & IRQ_TYPE_EDGE_FALLING)
		imr &= ~(0x100 << irq);
	mcf_write32(imr, MCFSIM2_GPIOINTENABLE);
}

static void intc2_irq_gpio_unmask(struct irq_data *d)
{
	u32 imr = mcf_read32(MCFSIM2_GPIOINTENABLE);
	u32 type = irqd_get_trigger_type(d);
	int irq = d->irq - MCF_IRQ_GPIO0;

	if (type & IRQ_TYPE_EDGE_RISING)
		imr |= (0x001 << irq);
	if (type & IRQ_TYPE_EDGE_FALLING)
		imr |= (0x100 << irq);
	mcf_write32(imr, MCFSIM2_GPIOINTENABLE);
}

static void intc2_irq_gpio_ack(struct irq_data *d)
{
	u32 imr = 0;
	u32 type = irqd_get_trigger_type(d);
	int irq = d->irq - MCF_IRQ_GPIO0;

	if (type & IRQ_TYPE_EDGE_RISING)
		imr |= (0x001 << irq);
	if (type & IRQ_TYPE_EDGE_FALLING)
		imr |= (0x100 << irq);
	mcf_write32(imr, MCFSIM2_GPIOINTCLEAR);
}

static int intc2_irq_gpio_set_type(struct irq_data *d, unsigned int f)
{
	if (f & ~IRQ_TYPE_EDGE_BOTH)
		return -EINVAL;
	return 0;
}

static struct irq_chip intc2_irq_gpio_chip = {
	.name		= "CF-INTC2",
	.irq_mask	= intc2_irq_gpio_mask,
	.irq_unmask	= intc2_irq_gpio_unmask,
	.irq_ack	= intc2_irq_gpio_ack,
	.irq_set_type	= intc2_irq_gpio_set_type,
};

static int __init mcf_intc2_init(void)
{
	int irq;

	/* set the interrupt base for the second interrupt controller */
	mcf_write32(MCFINTC2_VECBASE, MCFINTC2_INTBASE);

	/* GPIO interrupt sources */
	for (irq = MCF_IRQ_GPIO0; (irq <= MCF_IRQ_GPIO6); irq++) {
		irq_set_chip(irq, &intc2_irq_gpio_chip);
		irq_set_handler(irq, handle_edge_irq);
	}

	return 0;
}

arch_initcall(mcf_intc2_init);

Annotation

Implementation Notes