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// SPDX-License-Identifier: GPL-2.0+
/*
* RDA8810PL SoC irqchip driver
*
* Copyright RDA Microelectronics Company Limited
* Copyright (c) 2017 Andreas Färber
* Copyright (c) 2018 Manivannan Sadhasivam
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/irqdomain.h>
#include <linux/of_address.h>
#include <asm/exception.h>
#define RDA_INTC_FINALSTATUS 0x00
#define RDA_INTC_MASK_SET 0x08
#define RDA_INTC_MASK_CLR 0x0c
#define RDA_IRQ_MASK_ALL 0xFFFFFFFF
#define RDA_NR_IRQS 32
static void __iomem *rda_intc_base;
static struct irq_domain *rda_irq_domain;
static void rda_intc_mask_irq(struct irq_data *d)
{
writel_relaxed(BIT(d->hwirq), rda_intc_base + RDA_INTC_MASK_CLR);
}
static void rda_intc_unmask_irq(struct irq_data *d)
{
writel_relaxed(BIT(d->hwirq), rda_intc_base + RDA_INTC_MASK_SET);
}
static int rda_intc_set_type(struct irq_data *data, unsigned int flow_type)
{
/* Hardware supports only level triggered interrupts */
if ((flow_type & (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW)) == flow_type)
return 0;
return -EINVAL;
}
static void __exception_irq_entry rda_handle_irq(struct pt_regs *regs)
{
u32 stat = readl_relaxed(rda_intc_base + RDA_INTC_FINALSTATUS);
u32 hwirq;
while (stat) {
hwirq = __fls(stat);
generic_handle_domain_irq(rda_irq_domain, hwirq);
stat &= ~BIT(hwirq);
}
}
static struct irq_chip rda_irq_chip = {
.name = "rda-intc",
.irq_mask = rda_intc_mask_irq,
.irq_unmask = rda_intc_unmask_irq,
.irq_set_type = rda_intc_set_type,
};
static int rda_irq_map(struct irq_domain *d,
unsigned int virq, irq_hw_number_t hw)
{
irq_set_status_flags(virq, IRQ_LEVEL);
irq_set_chip_and_handler(virq, &rda_irq_chip, handle_level_irq);
irq_set_chip_data(virq, d->host_data);
irq_set_probe(virq);
return 0;
}
static const struct irq_domain_ops rda_irq_domain_ops = {
.map = rda_irq_map,
.xlate = irq_domain_xlate_onecell,
};
static int __init rda8810_intc_init(struct device_node *node,
struct device_node *parent)
{
rda_intc_base = of_io_request_and_map(node, 0, "rda-intc");
if (IS_ERR(rda_intc_base))
return PTR_ERR(rda_intc_base);
/* Mask all interrupt sources */
writel_relaxed(RDA_IRQ_MASK_ALL, rda_intc_base + RDA_INTC_MASK_CLR);
rda_irq_domain = irq_domain_create_linear(&node->fwnode, RDA_NR_IRQS,
&rda_irq_domain_ops,
rda_intc_base);
if (!rda_irq_domain) {
iounmap(rda_intc_base);
return -ENOMEM;
}
set_handle_irq(rda_handle_irq);
return 0;
}
IRQCHIP_DECLARE(rda_intc, "rda,8810pl-intc", rda8810_intc_init);
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