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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/mfd/syscon.h>
#include <linux/regmap.h>
#include <linux/slab.h>
#include <dt-bindings/interrupt-controller/arm-gic.h>
#define MAXIRQ 12
#define LS1021A_SCFGREVCR 0x200
struct ls_extirq_data {
struct regmap *syscon;
u32 intpcr;
bool bit_reverse;
u32 nirq;
struct irq_fwspec map[MAXIRQ];
};
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->bit_reverse)
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;
}
regmap_update_bits(priv->syscon, priv->intpcr, 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,
};
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)
{
const __be32 *map;
u32 mapsize;
int ret;
map = of_get_property(node, "interrupt-map", &mapsize);
if (!map)
return -ENOENT;
if (mapsize % sizeof(*map))
return -EINVAL;
mapsize /= sizeof(*map);
while (mapsize) {
struct device_node *ipar;
u32 hwirq, intsize, j;
if (mapsize < 3)
return -EINVAL;
hwirq = be32_to_cpup(map);
if (hwirq >= MAXIRQ)
return -EINVAL;
priv->nirq = max(priv->nirq, hwirq + 1);
ipar = of_find_node_by_phandle(be32_to_cpup(map + 2));
map += 3;
mapsize -= 3;
if (!ipar)
return -EINVAL;
priv->map[hwirq].fwnode = &ipar->fwnode;
ret = of_property_read_u32(ipar, "#interrupt-cells", &intsize);
if (ret)
return ret;
if (intsize > mapsize)
return -EINVAL;
priv->map[hwirq].param_count = intsize;
for (j = 0; j < intsize; ++j)
priv->map[hwirq].param[j] = be32_to_cpup(map++);
mapsize -= intsize;
}
return 0;
}
static int __init
ls_extirq_of_init(struct device_node *node, struct device_node *parent)
{
struct irq_domain *domain, *parent_domain;
struct ls_extirq_data *priv;
int ret;
parent_domain = irq_find_host(parent);
if (!parent_domain) {
pr_err("Cannot find parent domain\n");
return -ENODEV;
}
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->syscon = syscon_node_to_regmap(node->parent);
if (IS_ERR(priv->syscon)) {
ret = PTR_ERR(priv->syscon);
pr_err("Failed to lookup parent regmap\n");
goto out;
}
ret = of_property_read_u32(node, "reg", &priv->intpcr);
if (ret) {
pr_err("Missing INTPCR offset value\n");
goto out;
}
ret = ls_extirq_parse_map(priv, node);
if (ret)
goto out;
if (of_device_is_compatible(node, "fsl,ls1021a-extirq")) {
u32 revcr;
ret = regmap_read(priv->syscon, LS1021A_SCFGREVCR, &revcr);
if (ret)
goto out;
priv->bit_reverse = (revcr != 0);
}
domain = irq_domain_add_hierarchy(parent_domain, 0, priv->nirq, node,
&extirq_domain_ops, priv);
if (!domain)
ret = -ENOMEM;
out:
if (ret)
kfree(priv);
return ret;
}
IRQCHIP_DECLARE(ls1021a_extirq, "fsl,ls1021a-extirq", ls_extirq_of_init);
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