/*
* Driver for UniPhier AIDET (ARM Interrupt Detector)
*
* Copyright (C) 2017 Socionext Inc.
* Author: Masahiro Yamada <yamada.masahiro@socionext.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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.
*/
#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#include <linux/platform_device.h>
#include <linux/spinlock.h>
#define UNIPHIER_AIDET_NR_IRQS 256
#define UNIPHIER_AIDET_DETCONF 0x04 /* inverter register base */
struct uniphier_aidet_priv {
struct irq_domain *domain;
void __iomem *reg_base;
spinlock_t lock;
u32 saved_vals[UNIPHIER_AIDET_NR_IRQS / 32];
};
static void uniphier_aidet_reg_update(struct uniphier_aidet_priv *priv,
unsigned int reg, u32 mask, u32 val)
{
unsigned long flags;
u32 tmp;
spin_lock_irqsave(&priv->lock, flags);
tmp = readl_relaxed(priv->reg_base + reg);
tmp &= ~mask;
tmp |= mask & val;
writel_relaxed(tmp, priv->reg_base + reg);
spin_unlock_irqrestore(&priv->lock, flags);
}
static void uniphier_aidet_detconf_update(struct uniphier_aidet_priv *priv,
unsigned long index, unsigned int val)
{
unsigned int reg;
u32 mask;
reg = UNIPHIER_AIDET_DETCONF + index / 32 * 4;
mask = BIT(index % 32);
uniphier_aidet_reg_update(priv, reg, mask, val ? mask : 0);
}
static int uniphier_aidet_irq_set_type(struct irq_data *data, unsigned int type)
{
struct uniphier_aidet_priv *priv = data->chip_data;
unsigned int val;
/* enable inverter for active low triggers */
switch (type) {
case IRQ_TYPE_EDGE_RISING:
case IRQ_TYPE_LEVEL_HIGH:
val = 0;
break;
case IRQ_TYPE_EDGE_FALLING:
val = 1;
type = IRQ_TYPE_EDGE_RISING;
break;
case IRQ_TYPE_LEVEL_LOW:
val = 1;
type = IRQ_TYPE_LEVEL_HIGH;
break;
default:
return -EINVAL;
}
uniphier_aidet_detconf_update(priv, data->hwirq, val);
return irq_chip_set_type_parent(data, type);
}
static struct irq_chip uniphier_aidet_irq_chip = {
.name = "AIDET",
.irq_mask = irq_chip_mask_parent,
.irq_unmask = irq_chip_unmask_parent,
.irq_eoi = irq_chip_eoi_parent,
.irq_set_affinity = irq_chip_set_affinity_parent,
.irq_set_type = uniphier_aidet_irq_set_type,
};
static int uniphier_aidet_domain_translate(struct irq_domain *domain,
struct irq_fwspec *fwspec,
unsigned long *out_hwirq,
unsigned int *out_type)
{
if (WARN_ON(fwspec->param_count < 2))
return -EINVAL;
*out_hwirq = fwspec->param[0];
*out_type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK;
return 0;
}
static int uniphier_aidet_domain_alloc(struct irq_domain *domain,
unsigned int virq, unsigned int nr_irqs,
void *arg)
{
struct irq_fwspec parent_fwspec;
irq_hw_number_t hwirq;
unsigned int type;
int ret;
if (nr_irqs != 1)
return -EINVAL;
ret = uniphier_aidet_domain_translate(domain, arg, &hwirq, &type);
if (ret)
return ret;
switch (type) {
case IRQ_TYPE_EDGE_RISING:
case IRQ_TYPE_LEVEL_HIGH:
break;
case IRQ_TYPE_EDGE_FALLING:
type = IRQ_TYPE_EDGE_RISING;
break;
case IRQ_TYPE_LEVEL_LOW:
type = IRQ_TYPE_LEVEL_HIGH;
break;
default:
return -EINVAL;
}
if (hwirq >= UNIPHIER_AIDET_NR_IRQS)
return -ENXIO;
ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
&uniphier_aidet_irq_chip,
domain->host_data);
if (ret)
return ret;
/* parent is GIC */
parent_fwspec.fwnode = domain->parent->fwnode;
parent_fwspec.param_count = 3;
parent_fwspec.param[0] = 0; /* SPI */
parent_fwspec.param[1] = hwirq;
parent_fwspec.param[2] = type;
return irq_domain_alloc_irqs_parent(domain, virq, 1, &parent_fwspec);
}
static const struct irq_domain_ops uniphier_aidet_domain_ops = {
.alloc = uniphier_aidet_domain_alloc,
.free = irq_domain_free_irqs_common,
.translate = uniphier_aidet_domain_translate,
};
static int uniphier_aidet_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *parent_np;
struct irq_domain *parent_domain;
struct uniphier_aidet_priv *priv;
struct resource *res;
parent_np = of_irq_find_parent(dev->of_node);
if (!parent_np)
return -ENXIO;
parent_domain = irq_find_host(parent_np);
of_node_put(parent_np);
if (!parent_domain)
return -EPROBE_DEFER;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
priv->reg_base = devm_ioremap_resource(dev, res);
if (IS_ERR(priv->reg_base))
return PTR_ERR(priv->reg_base);
spin_lock_init(&priv->lock);
priv->domain = irq_domain_create_hierarchy(
parent_domain, 0,
UNIPHIER_AIDET_NR_IRQS,
of_node_to_fwnode(dev->of_node),
&uniphier_aidet_domain_ops, priv);
if (!priv->domain)
return -ENOMEM;
platform_set_drvdata(pdev, priv);
return 0;
}
static int __maybe_unused uniphier_aidet_suspend(struct device *dev)
{
struct uniphier_aidet_priv *priv = dev_get_drvdata(dev);
int i;
for (i = 0; i < ARRAY_SIZE(priv->saved_vals); i++)
priv->saved_vals[i] = readl_relaxed(
priv->reg_base + UNIPHIER_AIDET_DETCONF + i * 4);
return 0;
}
static int __maybe_unused uniphier_aidet_resume(struct device *dev)
{
struct uniphier_aidet_priv *priv = dev_get_drvdata(dev);
int i;
for (i = 0; i < ARRAY_SIZE(priv->saved_vals); i++)
writel_relaxed(priv->saved_vals[i],
priv->reg_base + UNIPHIER_AIDET_DETCONF + i * 4);
return 0;
}
static const struct dev_pm_ops uniphier_aidet_pm_ops = {
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(uniphier_aidet_suspend,
uniphier_aidet_resume)
};
static const struct of_device_id uniphier_aidet_match[] = {
{ .compatible = "socionext,uniphier-ld4-aidet" },
{ .compatible = "socionext,uniphier-pro4-aidet" },
{ .compatible = "socionext,uniphier-sld8-aidet" },
{ .compatible = "socionext,uniphier-pro5-aidet" },
{ .compatible = "socionext,uniphier-pxs2-aidet" },
{ .compatible = "socionext,uniphier-ld11-aidet" },
{ .compatible = "socionext,uniphier-ld20-aidet" },
{ .compatible = "socionext,uniphier-pxs3-aidet" },
{ /* sentinel */ }
};
static struct platform_driver uniphier_aidet_driver = {
.probe = uniphier_aidet_probe,
.driver = {
.name = "uniphier-aidet",
.of_match_table = uniphier_aidet_match,
.pm = &uniphier_aidet_pm_ops,
},
};
builtin_platform_driver(uniphier_aidet_driver);
