drivers/irqchip/irq-tb10x.c

Source file repositories/reference/linux-study-clean/drivers/irqchip/irq-tb10x.c

File Facts

System
Linux kernel
Corpus path
drivers/irqchip/irq-tb10x.c
Extension
.c
Size
4885 bytes
Lines
177
Domain
Driver Families
Bucket
drivers/irqchip
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Abilis Systems interrupt controller driver
 *
 * Copyright (C) Abilis Systems 2012
 *
 * Author: Christian Ruppert <christian.ruppert@abilis.com>
 */

#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/bitops.h>

#define AB_IRQCTL_INT_ENABLE   0x00
#define AB_IRQCTL_INT_STATUS   0x04
#define AB_IRQCTL_SRC_MODE     0x08
#define AB_IRQCTL_SRC_POLARITY 0x0C
#define AB_IRQCTL_INT_MODE     0x10
#define AB_IRQCTL_INT_POLARITY 0x14
#define AB_IRQCTL_INT_FORCE    0x18

#define AB_IRQCTL_MAXIRQ       32

static inline void ab_irqctl_writereg(struct irq_chip_generic *gc, u32 reg,
	u32 val)
{
	irq_reg_writel(gc, val, reg);
}

static inline u32 ab_irqctl_readreg(struct irq_chip_generic *gc, u32 reg)
{
	return irq_reg_readl(gc, reg);
}

static int tb10x_irq_set_type(struct irq_data *data, unsigned int flow_type)
{
	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
	uint32_t mod, pol, im = data->mask;

	guard(raw_spinlock)(&gc->lock);

	mod = ab_irqctl_readreg(gc, AB_IRQCTL_SRC_MODE) | im;
	pol = ab_irqctl_readreg(gc, AB_IRQCTL_SRC_POLARITY) | im;

	switch (flow_type & IRQF_TRIGGER_MASK) {
	case IRQ_TYPE_EDGE_FALLING:
		pol ^= im;
		break;
	case IRQ_TYPE_LEVEL_HIGH:
		mod ^= im;
		break;
	case IRQ_TYPE_NONE:
		flow_type = IRQ_TYPE_LEVEL_LOW;
		fallthrough;
	case IRQ_TYPE_LEVEL_LOW:
		mod ^= im;
		pol ^= im;
		break;
	case IRQ_TYPE_EDGE_RISING:
		break;
	default:
		pr_err("%s: Cannot assign multiple trigger modes to IRQ %d.\n",	__func__, data->irq);
		return -EBADR;
	}

	irqd_set_trigger_type(data, flow_type);
	irq_setup_alt_chip(data, flow_type);

	ab_irqctl_writereg(gc, AB_IRQCTL_SRC_MODE, mod);
	ab_irqctl_writereg(gc, AB_IRQCTL_SRC_POLARITY, pol);
	ab_irqctl_writereg(gc, AB_IRQCTL_INT_STATUS, im);
	return IRQ_SET_MASK_OK;
}

static void tb10x_irq_cascade(struct irq_desc *desc)
{
	struct irq_domain *domain = irq_desc_get_handler_data(desc);
	unsigned int irq = irq_desc_get_irq(desc);

	generic_handle_domain_irq(domain, irq);
}

static int __init of_tb10x_init_irq(struct device_node *ictl,
					struct device_node *parent)

Annotation

Implementation Notes