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// SPDX-License-Identifier: GPL-2.0
#define pr_fmt(fmt) "irq-ls-extirq: " fmt
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/irqdomain.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/slab.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
#define MAXIRQ 12
#define LS1021A_SCFGREVCR 0x200
struct ls_extirq_data {
void __iomem *intpcr;
raw_spinlock_t lock;
bool big_endian;
bool is_ls1021a_or_ls1043a;
u32 nirq;
struct irq_fwspec map[MAXIRQ];
};
static void ls_extirq_intpcr_rmw(struct ls_extirq_data *priv, u32 mask,
u32 value)
{
u32 intpcr;
/*
* Serialize concurrent calls to ls_extirq_set_type() from multiple
* IRQ descriptors, making sure the read-modify-write is atomic.
*/
raw_spin_lock(&priv->lock);
if (priv->big_endian)
intpcr = ioread32be(priv->intpcr);
else
intpcr = ioread32(priv->intpcr);
intpcr &= ~mask;
intpcr |= value;
if (priv->big_endian)
iowrite32be(intpcr, priv->intpcr);
else
iowrite32(intpcr, priv->intpcr);
raw_spin_unlock(&priv->lock);
}
static int
ls_extirq_set_type(struct irq_data *data, unsigned int type)
{
struct ls_extirq_data *priv = data->chip_data;
irq_hw_number_t hwirq = data->hwirq;
u32 value, mask;
if (priv->is_ls1021a_or_ls1043a)
mask = 1U << (31 - hwirq);
else
mask = 1U << hwirq;
switch (type) {
case IRQ_TYPE_LEVEL_LOW:
type = IRQ_TYPE_LEVEL_HIGH;
value = mask;
break;
case IRQ_TYPE_EDGE_FALLING:
type = IRQ_TYPE_EDGE_RISING;
value = mask;
break;
case IRQ_TYPE_LEVEL_HIGH:
case IRQ_TYPE_EDGE_RISING:
value = 0;
break;
default:
return -EINVAL;
}
ls_extirq_intpcr_rmw(priv, mask, value);
return irq_chip_set_type_parent(data, type);
}
static struct irq_chip ls_extirq_chip = {
.name = "ls-extirq",
.irq_mask = irq_chip_mask_parent,
.irq_unmask = irq_chip_unmask_parent,
.irq_eoi = irq_chip_eoi_parent,
.irq_set_type = ls_extirq_set_type,
.irq_retrigger = irq_chip_retrigger_hierarchy,
.irq_set_affinity = irq_chip_set_affinity_parent,
.flags = IRQCHIP_SET_TYPE_MASKED | IRQCHIP_SKIP_SET_WAKE,
};
static int
ls_extirq_domain_alloc(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs, void *arg)
{
struct ls_extirq_data *priv = domain->host_data;
struct irq_fwspec *fwspec = arg;
irq_hw_number_t hwirq;
if (fwspec->param_count != 2)
return -EINVAL;
hwirq = fwspec->param[0];
if (hwirq >= priv->nirq)
return -EINVAL;
irq_domain_set_hwirq_and_chip(domain, virq, hwirq, &ls_extirq_chip,
priv);
return irq_domain_alloc_irqs_parent(domain, virq, 1, &priv->map[hwirq]);
}
static const struct irq_domain_ops extirq_domain_ops = {
.xlate = irq_domain_xlate_twocell,
.alloc = ls_extirq_domain_alloc,
.free = irq_domain_free_irqs_common,
};
static int
ls_extirq_parse_map(struct ls_extirq_data *priv, struct device_node *node)
{
struct of_imap_parser imap_parser;
struct of_imap_item imap_item;
int ret;
ret = of_imap_parser_init(&imap_parser, node, &imap_item);
if (ret)
return ret;
for_each_of_imap_item(&imap_parser, &imap_item) {
struct device_node *ipar;
u32 hwirq;
int i;
hwirq = imap_item.child_imap[0];
if (hwirq >= MAXIRQ) {
of_node_put(imap_item.parent_args.np);
return -EINVAL;
}
priv->nirq = max(priv->nirq, hwirq + 1);
ipar = of_node_get(imap_item.parent_args.np);
priv->map[hwirq].fwnode = of_fwnode_handle(ipar);
priv->map[hwirq].param_count = imap_item.parent_args.args_count;
for (i = 0; i < priv->map[hwirq].param_count; i++)
priv->map[hwirq].param[i] = imap_item.parent_args.args[i];
}
return 0;
}
static int ls_extirq_probe(struct platform_device *pdev)
{
struct irq_domain *domain, *parent_domain;
struct device_node *node, *parent;
struct device *dev = &pdev->dev;
struct ls_extirq_data *priv;
int ret;
node = dev->of_node;
parent = of_irq_find_parent(node);
if (!parent)
return dev_err_probe(dev, -ENODEV, "Failed to get IRQ parent node\n");
parent_domain = irq_find_host(parent);
if (!parent_domain)
return dev_err_probe(dev, -EPROBE_DEFER, "Cannot find parent domain\n");
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return dev_err_probe(dev, -ENOMEM, "Failed to allocate memory\n");
priv->intpcr = devm_of_iomap(dev, node, 0, NULL);
if (!priv->intpcr)
return dev_err_probe(dev, -ENOMEM, "Cannot ioremap OF node %pOF\n", node);
ret = ls_extirq_parse_map(priv, node);
if (ret)
return dev_err_probe(dev, ret, "Failed to parse IRQ map\n");
priv->big_endian = of_device_is_big_endian(node->parent);
priv->is_ls1021a_or_ls1043a = of_device_is_compatible(node, "fsl,ls1021a-extirq") ||
of_device_is_compatible(node, "fsl,ls1043a-extirq");
raw_spin_lock_init(&priv->lock);
domain = irq_domain_create_hierarchy(parent_domain, 0, priv->nirq, of_fwnode_handle(node),
&extirq_domain_ops, priv);
if (!domain)
return dev_err_probe(dev, -ENOMEM, "Failed to add IRQ domain\n");
return 0;
}
static const struct of_device_id ls_extirq_dt_ids[] = {
{ .compatible = "fsl,ls1021a-extirq" },
{ .compatible = "fsl,ls1043a-extirq" },
{ .compatible = "fsl,ls1088a-extirq" },
{}
};
MODULE_DEVICE_TABLE(of, ls_extirq_dt_ids);
static struct platform_driver ls_extirq_driver = {
.probe = ls_extirq_probe,
.driver = {
.name = "ls-extirq",
.of_match_table = ls_extirq_dt_ids,
}
};
builtin_platform_driver(ls_extirq_driver);
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