Release 4.12 drivers/irqchip/irq-renesas-irqc.c
/*
* 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/clk.h>
#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/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 platform_device *pdev;
struct irq_chip_generic *gc;
struct irq_domain *irq_domain;
struct clk *clk;
};
static struct irqc_priv *irq_data_to_priv(struct irq_data *data)
{
return data->domain->host_data;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Magnus Damm | 20 | 100.00% | 1 | 100.00% |
| Total | 20 | 100.00% | 1 | 100.00% |
static void irqc_dbg(struct irqc_irq *i, char *str)
{
dev_dbg(&i->p->pdev->dev, "%s (%d:%d)\n",
str, i->requested_irq, i->hw_irq);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Magnus Damm | 39 | 100.00% | 2 | 100.00% |
| Total | 39 | 100.00% | 2 | 100.00% |
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;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Magnus Damm | 108 | 99.08% | 2 | 66.67% |
| Geert Uytterhoeven | 1 | 0.92% | 1 | 33.33% |
| Total | 109 | 100.00% | 3 | 100.00% |
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 (!p->clk)
return 0;
if (on)
clk_enable(p->clk);
else
clk_disable(p->clk);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Geert Uytterhoeven | 78 | 98.73% | 2 | 66.67% |
| Magnus Damm | 1 | 1.27% | 1 | 33.33% |
| Total | 79 | 100.00% | 3 | 100.00% |
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_irq(irq_find_mapping(p->irq_domain, i->hw_irq));
return IRQ_HANDLED;
}
return IRQ_NONE;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Magnus Damm | 98 | 98.99% | 2 | 66.67% |
| Geert Uytterhoeven | 1 | 1.01% | 1 | 33.33% |
| Total | 99 | 100.00% | 3 | 100.00% |
static int irqc_probe(struct platform_device *pdev)
{
struct irqc_priv *p;
struct resource *io;
struct resource *irq;
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;
}
p->pdev = pdev;
platform_set_drvdata(pdev, p);
p->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(p->clk)) {
dev_warn(&pdev->dev, "unable to get clock\n");
p->clk = NULL;
}
pm_runtime_enable(&pdev->dev);
pm_runtime_get_sync(&pdev->dev);
/* 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].hw_irq = k;
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 */
p->irq_domain = irq_domain_add_linear(pdev->dev.of_node,
p->number_of_irqs,
&irq_generic_chip_ops, p);
if (!p->irq_domain) {
ret = -ENXIO;
dev_err(&pdev->dev, "cannot initialize irq domain\n");
goto err2;
}
ret = irq_alloc_domain_generic_chips(p->irq_domain, p->number_of_irqs,
1, name, handle_level_irq,
0, 0, IRQ_GC_INIT_NESTED_LOCK);
if (ret) {
dev_err(&pdev->dev, "cannot allocate generic chip\n");
goto err3;
}
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;
/* 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 err4;
}
}
dev_info(&pdev->dev, "driving %d irqs\n", p->number_of_irqs);
return 0;
err4:
while (--k >= 0)
free_irq(p->irq[k].requested_irq, &p->irq[k]);
err3:
irq_domain_remove(p->irq_domain);
err2:
iounmap(p->iomem);
err1:
pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);
kfree(p);
err0:
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Magnus Damm | 652 | 89.44% | 4 | 57.14% |
| Geert Uytterhoeven | 73 | 10.01% | 2 | 28.57% |
| Axel Lin | 4 | 0.55% | 1 | 14.29% |
| Total | 729 | 100.00% | 7 | 100.00% |
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);
pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);
kfree(p);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Magnus Damm | 81 | 83.51% | 1 | 50.00% |
| Geert Uytterhoeven | 16 | 16.49% | 1 | 50.00% |
| Total | 97 | 100.00% | 2 | 100.00% |
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,
}
};
static int __init irqc_init(void)
{
return platform_driver_register(&irqc_device_driver);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Magnus Damm | 16 | 100.00% | 1 | 100.00% |
| Total | 16 | 100.00% | 1 | 100.00% |
postcore_initcall(irqc_init);
static void __exit irqc_exit(void)
{
platform_driver_unregister(&irqc_device_driver);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Magnus Damm | 15 | 100.00% | 1 | 100.00% |
| Total | 15 | 100.00% | 1 | 100.00% |
module_exit(irqc_exit);
MODULE_AUTHOR("Magnus Damm");
MODULE_DESCRIPTION("Renesas IRQC Driver");
MODULE_LICENSE("GPL v2");
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Magnus Damm | 1286 | 84.94% | 5 | 45.45% |
| Geert Uytterhoeven | 224 | 14.80% | 5 | 45.45% |
| Axel Lin | 4 | 0.26% | 1 | 9.09% |
| Total | 1514 | 100.00% | 11 | 100.00% |
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