// SPDX-License-Identifier: GPL-2.0
/*
* Renesas IRQC Driver
*
* Copyright (C) 2013 Magnus Damm
*/
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#define IRQC_IRQ_MAX 32 /* maximum 32 interrupts per driver instance */
#define IRQC_REQ_STS 0x00 /* Interrupt Request Status Register */
#define IRQC_EN_STS 0x04 /* Interrupt Enable Status Register */
#define IRQC_EN_SET 0x08 /* Interrupt Enable Set Register */
#define IRQC_INT_CPU_BASE(n) (0x000 + ((n) * 0x10))
/* SYS-CPU vs. RT-CPU */
#define DETECT_STATUS 0x100 /* IRQn Detect Status Register */
#define MONITOR 0x104 /* IRQn Signal Level Monitor Register */
#define HLVL_STS 0x108 /* IRQn High Level Detect Status Register */
#define LLVL_STS 0x10c /* IRQn Low Level Detect Status Register */
#define S_R_EDGE_STS 0x110 /* IRQn Sync Rising Edge Detect Status Reg. */
#define S_F_EDGE_STS 0x114 /* IRQn Sync Falling Edge Detect Status Reg. */
#define A_R_EDGE_STS 0x118 /* IRQn Async Rising Edge Detect Status Reg. */
#define A_F_EDGE_STS 0x11c /* IRQn Async Falling Edge Detect Status Reg. */
#define CHTEN_STS 0x120 /* Chattering Reduction Status Register */
#define IRQC_CONFIG(n) (0x180 + ((n) * 0x04))
/* IRQn Configuration Register */
struct irqc_irq {
int hw_irq;
int requested_irq;
struct irqc_priv *p;
};
struct irqc_priv {
void __iomem *iomem;
void __iomem *cpu_int_base;
struct irqc_irq irq[IRQC_IRQ_MAX];
unsigned int number_of_irqs;
struct device *dev;
struct irq_chip_generic *gc;
struct irq_domain *irq_domain;
atomic_t wakeup_path;
};
static struct irqc_priv *irq_data_to_priv(struct irq_data *data)
{
return data->domain->host_data;
}
static void irqc_dbg(struct irqc_irq *i, char *str)
{
dev_dbg(i->p->dev, "%s (%d:%d)\n", str, i->requested_irq, i->hw_irq);
}
static unsigned char irqc_sense[IRQ_TYPE_SENSE_MASK + 1] = {
[IRQ_TYPE_LEVEL_LOW] = 0x01,
[IRQ_TYPE_LEVEL_HIGH] = 0x02,
[IRQ_TYPE_EDGE_FALLING] = 0x04, /* Synchronous */
[IRQ_TYPE_EDGE_RISING] = 0x08, /* Synchronous */
[IRQ_TYPE_EDGE_BOTH] = 0x0c, /* Synchronous */
};
static int irqc_irq_set_type(struct irq_data *d, unsigned int type)
{
struct irqc_priv *p = irq_data_to_priv(d);
int hw_irq = irqd_to_hwirq(d);
unsigned char value = irqc_sense[type & IRQ_TYPE_SENSE_MASK];
u32 tmp;
irqc_dbg(&p->irq[hw_irq], "sense");
if (!value)
return -EINVAL;
tmp = ioread32(p->iomem + IRQC_CONFIG(hw_irq));
tmp &= ~0x3f;
tmp |= value;
iowrite32(tmp, p->iomem + IRQC_CONFIG(hw_irq));
return 0;
}
static int irqc_irq_set_wake(struct irq_data *d, unsigned int on)
{
struct irqc_priv *p = irq_data_to_priv(d);
int hw_irq = irqd_to_hwirq(d);
irq_set_irq_wake(p->irq[hw_irq].requested_irq, on);
if (on)
atomic_inc(&p->wakeup_path);
else
atomic_dec(&p->wakeup_path);
return 0;
}
static irqreturn_t irqc_irq_handler(int irq, void *dev_id)
{
struct irqc_irq *i = dev_id;
struct irqc_priv *p = i->p;
u32 bit = BIT(i->hw_irq);
irqc_dbg(i, "demux1");
if (ioread32(p->iomem + DETECT_STATUS) & bit) {
iowrite32(bit, p->iomem + DETECT_STATUS);
irqc_dbg(i, "demux2");
generic_handle_domain_irq(p->irq_domain, i->hw_irq);
return IRQ_HANDLED;
}
return IRQ_NONE;
}
static int irqc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
const char *name = dev_name(dev);
struct irqc_priv *p;
int ret;
int k;
p = devm_kzalloc(dev, sizeof(*p), GFP_KERNEL);
if (!p)
return -ENOMEM;
p->dev = dev;
platform_set_drvdata(pdev, p);
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
/* allow any number of IRQs between 1 and IRQC_IRQ_MAX */
for (k = 0; k < IRQC_IRQ_MAX; k++) {
ret = platform_get_irq_optional(pdev, k);
if (ret == -ENXIO)
break;
if (ret < 0)
goto err_runtime_pm_disable;
p->irq[k].p = p;
p->irq[k].hw_irq = k;
p->irq[k].requested_irq = ret;
}
p->number_of_irqs = k;
if (p->number_of_irqs < 1) {
dev_err(dev, "not enough IRQ resources\n");
ret = -EINVAL;
goto err_runtime_pm_disable;
}
/* ioremap IOMEM and setup read/write callbacks */
p->iomem = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(p->iomem)) {
ret = PTR_ERR(p->iomem);
goto err_runtime_pm_disable;
}
p->cpu_int_base = p->iomem + IRQC_INT_CPU_BASE(0); /* SYS-SPI */
p->irq_domain = irq_domain_add_linear(dev->of_node, p->number_of_irqs,
&irq_generic_chip_ops, p);
if (!p->irq_domain) {
ret = -ENXIO;
dev_err(dev, "cannot initialize irq domain\n");
goto err_runtime_pm_disable;
}
ret = irq_alloc_domain_generic_chips(p->irq_domain, p->number_of_irqs,
1, "irqc", handle_level_irq,
0, 0, IRQ_GC_INIT_NESTED_LOCK);
if (ret) {
dev_err(dev, "cannot allocate generic chip\n");
goto err_remove_domain;
}
p->gc = irq_get_domain_generic_chip(p->irq_domain, 0);
p->gc->reg_base = p->cpu_int_base;
p->gc->chip_types[0].regs.enable = IRQC_EN_SET;
p->gc->chip_types[0].regs.disable = IRQC_EN_STS;
p->gc->chip_types[0].chip.irq_mask = irq_gc_mask_disable_reg;
p->gc->chip_types[0].chip.irq_unmask = irq_gc_unmask_enable_reg;
p->gc->chip_types[0].chip.irq_set_type = irqc_irq_set_type;
p->gc->chip_types[0].chip.irq_set_wake = irqc_irq_set_wake;
p->gc->chip_types[0].chip.flags = IRQCHIP_MASK_ON_SUSPEND;
irq_domain_set_pm_device(p->irq_domain, dev);
/* request interrupts one by one */
for (k = 0; k < p->number_of_irqs; k++) {
if (devm_request_irq(dev, p->irq[k].requested_irq,
irqc_irq_handler, 0, name, &p->irq[k])) {
dev_err(dev, "failed to request IRQ\n");
ret = -ENOENT;
goto err_remove_domain;
}
}
dev_info(dev, "driving %d irqs\n", p->number_of_irqs);
return 0;
err_remove_domain:
irq_domain_remove(p->irq_domain);
err_runtime_pm_disable:
pm_runtime_put(dev);
pm_runtime_disable(dev);
return ret;
}
static void irqc_remove(struct platform_device *pdev)
{
struct irqc_priv *p = platform_get_drvdata(pdev);
irq_domain_remove(p->irq_domain);
pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);
}
static int __maybe_unused irqc_suspend(struct device *dev)
{
struct irqc_priv *p = dev_get_drvdata(dev);
if (atomic_read(&p->wakeup_path))
device_set_wakeup_path(dev);
return 0;
}
static SIMPLE_DEV_PM_OPS(irqc_pm_ops, irqc_suspend, NULL);
static const struct of_device_id irqc_dt_ids[] = {
{ .compatible = "renesas,irqc", },
{},
};
MODULE_DEVICE_TABLE(of, irqc_dt_ids);
static struct platform_driver irqc_device_driver = {
.probe = irqc_probe,
.remove_new = irqc_remove,
.driver = {
.name = "renesas_irqc",
.of_match_table = irqc_dt_ids,
.pm = &irqc_pm_ops,
}
};
static int __init irqc_init(void)
{
return platform_driver_register(&irqc_device_driver);
}
postcore_initcall(irqc_init);
static void __exit irqc_exit(void)
{
platform_driver_unregister(&irqc_device_driver);
}
module_exit(irqc_exit);
MODULE_AUTHOR("Magnus Damm");
MODULE_DESCRIPTION("Renesas IRQC Driver");
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