/*
* Renesas IRQC Driver
*
* Copyright (C) 2013 Magnus Damm
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/spinlock.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/platform_data/irq-renesas-irqc.h>
#define IRQC_IRQ_MAX 32 /* maximum 32 interrupts per driver instance */
#define IRQC_REQ_STS 0x00
#define IRQC_EN_STS 0x04
#define IRQC_EN_SET 0x08
#define IRQC_INT_CPU_BASE(n) (0x000 + ((n) * 0x10))
#define DETECT_STATUS 0x100
#define IRQC_CONFIG(n) (0x180 + ((n) * 0x04))
struct irqc_irq {
int hw_irq;
int requested_irq;
int domain_irq;
struct irqc_priv *p;
};
struct irqc_priv {
void __iomem *iomem;
void __iomem *cpu_int_base;
struct irqc_irq irq[IRQC_IRQ_MAX];
struct renesas_irqc_config config;
unsigned int number_of_irqs;
struct platform_device *pdev;
struct irq_chip irq_chip;
struct irq_domain *irq_domain;
};
static void irqc_dbg(struct irqc_irq *i, char *str)
{
dev_dbg(&i->p->pdev->dev, "%s (%d:%d:%d)\n",
str, i->requested_irq, i->hw_irq, i->domain_irq);
}
static void irqc_irq_enable(struct irq_data *d)
{
struct irqc_priv *p = irq_data_get_irq_chip_data(d);
int hw_irq = irqd_to_hwirq(d);
irqc_dbg(&p->irq[hw_irq], "enable");
iowrite32(BIT(hw_irq), p->cpu_int_base + IRQC_EN_SET);
}
static void irqc_irq_disable(struct irq_data *d)
{
struct irqc_priv *p = irq_data_get_irq_chip_data(d);
int hw_irq = irqd_to_hwirq(d);
irqc_dbg(&p->irq[hw_irq], "disable");
iowrite32(BIT(hw_irq), p->cpu_int_base + IRQC_EN_STS);
}
#define INTC_IRQ_SENSE_VALID 0x10
#define INTC_IRQ_SENSE(x) (x + INTC_IRQ_SENSE_VALID)
static unsigned char irqc_sense[IRQ_TYPE_SENSE_MASK + 1] = {
[IRQ_TYPE_LEVEL_LOW] = INTC_IRQ_SENSE(0x01),
[IRQ_TYPE_LEVEL_HIGH] = INTC_IRQ_SENSE(0x02),
[IRQ_TYPE_EDGE_FALLING] = INTC_IRQ_SENSE(0x04), /* Synchronous */
[IRQ_TYPE_EDGE_RISING] = INTC_IRQ_SENSE(0x08), /* Synchronous */
[IRQ_TYPE_EDGE_BOTH] = INTC_IRQ_SENSE(0x0c), /* Synchronous */
};
static int irqc_irq_set_type(struct irq_data *d, unsigned int type)
{
struct irqc_priv *p = irq_data_get_irq_chip_data(d);
int hw_irq = irqd_to_hwirq(d);
unsigned char value = irqc_sense[type & IRQ_TYPE_SENSE_MASK];
unsigned long tmp;
irqc_dbg(&p->irq[hw_irq], "sense");
if (!(value & INTC_IRQ_SENSE_VALID))
return -EINVAL;
tmp = ioread32(p->iomem + IRQC_CONFIG(hw_irq));
tmp &= ~0x3f;
tmp |= value ^ INTC_IRQ_SENSE_VALID;
iowrite32(tmp, p->iomem + IRQC_CONFIG(hw_irq));
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;
unsigned long 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_irq(i->domain_irq);
return IRQ_HANDLED;
}
return IRQ_NONE;
}
static int irqc_irq_domain_map(struct irq_domain *h, unsigned int virq,
irq_hw_number_t hw)
{
struct irqc_priv *p = h->host_data;
p->irq[hw].domain_irq = virq;
p->irq[hw].hw_irq = hw;
irqc_dbg(&p->irq[hw], "map");
irq_set_chip_data(virq, h->host_data);
irq_set_chip_and_handler(virq, &p->irq_chip, handle_level_irq);
set_irq_flags(virq, IRQF_VALID); /* kill me now */
return 0;
}
static struct irq_domain_ops irqc_irq_domain_ops = {
.map = irqc_irq_domain_map,
.xlate = irq_domain_xlate_twocell,
};
static int irqc_probe(struct platform_device *pdev)
{
struct renesas_irqc_config *pdata = pdev->dev.platform_data;
struct irqc_priv *p;
struct resource *io;
struct resource *irq;
struct irq_chip *irq_chip;
const char *name = dev_name(&pdev->dev);
int ret;
int k;
p = kzalloc(sizeof(*p), GFP_KERNEL);
if (!p) {
dev_err(&pdev->dev, "failed to allocate driver data\n");
ret = -ENOMEM;
goto err0;
}
/* deal with driver instance configuration */
if (pdata)
memcpy(&p->config, pdata, sizeof(*pdata));
p->pdev = pdev;
platform_set_drvdata(pdev, p);
/* get hold of manadatory IOMEM */
io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!io) {
dev_err(&pdev->dev, "not enough IOMEM resources\n");
ret = -EINVAL;
goto err1;
}
/* allow any number of IRQs between 1 and IRQC_IRQ_MAX */
for (k = 0; k < IRQC_IRQ_MAX; k++) {
irq = platform_get_resource(pdev, IORESOURCE_IRQ, k);
if (!irq)
break;
p->irq[k].p = p;
p->irq[k].requested_irq = irq->start;
}
p->number_of_irqs = k;
if (p->number_of_irqs < 1) {
dev_err(&pdev->dev, "not enough IRQ resources\n");
ret = -EINVAL;
goto err1;
}
/* ioremap IOMEM and setup read/write callbacks */
p->iomem = ioremap_nocache(io->start, resource_size(io));
if (!p->iomem) {
dev_err(&pdev->dev, "failed to remap IOMEM\n");
ret = -ENXIO;
goto err2;
}
p->cpu_int_base = p->iomem + IRQC_INT_CPU_BASE(0); /* SYS-SPI */
irq_chip = &p->irq_chip;
irq_chip->name = name;
irq_chip->irq_mask = irqc_irq_disable;
irq_chip->irq_unmask = irqc_irq_enable;
irq_chip->irq_enable = irqc_irq_enable;
irq_chip->irq_disable = irqc_irq_disable;
irq_chip->irq_set_type = irqc_irq_set_type;
irq_chip->flags = IRQCHIP_SKIP_SET_WAKE;
p->irq_domain = irq_domain_add_simple(pdev->dev.of_node,
p->number_of_irqs,
p->config.irq_base,
&irqc_irq_domain_ops, p);
if (!p->irq_domain) {
ret = -ENXIO;
dev_err(&pdev->dev, "cannot initialize irq domain\n");
goto err2;
}
/* request interrupts one by one */
for (k = 0; k < p->number_of_irqs; k++) {
if (request_irq(p->irq[k].requested_irq, irqc_irq_handler,
0, name, &p->irq[k])) {
dev_err(&pdev->dev, "failed to request IRQ\n");
ret = -ENOENT;
goto err3;
}
}
dev_info(&pdev->dev, "driving %d irqs\n", p->number_of_irqs);
/* warn in case of mismatch if irq base is specified */
if (p->config.irq_base) {
if (p->config.irq_base != p->irq[0].domain_irq)
dev_warn(&pdev->dev, "irq base mismatch (%d/%d)\n",
p->config.irq_base, p->irq[0].domain_irq);
}
return 0;
err3:
for (; k >= 0; k--)
free_irq(p->irq[k - 1].requested_irq, &p->irq[k - 1]);
irq_domain_remove(p->irq_domain);
err2:
iounmap(p->iomem);
err1:
kfree(p);
err0:
return ret;
}
static int irqc_remove(struct platform_device *pdev)
{
struct irqc_priv *p = platform_get_drvdata(pdev);
int k;
for (k = 0; k < p->number_of_irqs; k++)
free_irq(p->irq[k].requested_irq, &p->irq[k]);
irq_domain_remove(p->irq_domain);
iounmap(p->iomem);
kfree(p);
return 0;
}
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 = irqc_remove,
.driver = {
.name = "renesas_irqc",
.of_match_table = irqc_dt_ids,
.owner = THIS_MODULE,
}
};
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");
MODULE_LICENSE("GPL v2");
