drivers/irqchip/irq-csky-mpintc.c

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

File Facts

System
Linux kernel
Corpus path
drivers/irqchip/irq-csky-mpintc.c
Extension
.c
Size
6596 bytes
Lines
282
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
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/module.h>
#include <linux/irqdomain.h>
#include <linux/irqchip.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/smp.h>
#include <linux/io.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/reg_ops.h>

static struct irq_domain *root_domain;
static void __iomem *INTCG_base;
static void __iomem *INTCL_base;

#define IPI_IRQ		15
#define INTC_IRQS	256
#define COMM_IRQ_BASE	32

#define INTCG_SIZE	0x8000
#define INTCL_SIZE	0x1000

#define INTCG_ICTLR	0x0
#define INTCG_CICFGR	0x100
#define INTCG_CIDSTR	0x1000

#define INTCL_PICTLR	0x0
#define INTCL_CFGR	0x14
#define INTCL_SIGR	0x60
#define INTCL_RDYIR	0x6c
#define INTCL_SENR	0xa0
#define INTCL_CENR	0xa4
#define INTCL_CACR	0xb4

static DEFINE_PER_CPU(void __iomem *, intcl_reg);

static unsigned long *__trigger;

#define IRQ_OFFSET(irq) ((irq < COMM_IRQ_BASE) ? irq : (irq - COMM_IRQ_BASE))

#define TRIG_BYTE_OFFSET(i)	((((i) * 2) / 32) * 4)
#define TRIG_BIT_OFFSET(i)	 (((i) * 2) % 32)

#define TRIG_VAL(trigger, irq)	(trigger << TRIG_BIT_OFFSET(IRQ_OFFSET(irq)))
#define TRIG_VAL_MSK(irq)	    (~(3 << TRIG_BIT_OFFSET(IRQ_OFFSET(irq))))

#define TRIG_BASE(irq) \
	(TRIG_BYTE_OFFSET(IRQ_OFFSET(irq)) + ((irq < COMM_IRQ_BASE) ? \
	(this_cpu_read(intcl_reg) + INTCL_CFGR) : (INTCG_base + INTCG_CICFGR)))

static DEFINE_SPINLOCK(setup_lock);
static void setup_trigger(unsigned long irq, unsigned long trigger)
{
	unsigned int tmp;

	spin_lock(&setup_lock);

	/* setup trigger */
	tmp = readl_relaxed(TRIG_BASE(irq)) & TRIG_VAL_MSK(irq);

	writel_relaxed(tmp | TRIG_VAL(trigger, irq), TRIG_BASE(irq));

	spin_unlock(&setup_lock);
}

static void csky_mpintc_handler(struct pt_regs *regs)
{
	void __iomem *reg_base = this_cpu_read(intcl_reg);

	generic_handle_domain_irq(root_domain,
		readl_relaxed(reg_base + INTCL_RDYIR));
}

static void csky_mpintc_unmask(struct irq_data *d)
{
	void __iomem *reg_base = this_cpu_read(intcl_reg);

	setup_trigger(d->hwirq, __trigger[d->hwirq]);

	writel_relaxed(d->hwirq, reg_base + INTCL_SENR);
}

static void csky_mpintc_mask(struct irq_data *d)

Annotation

Implementation Notes