1// SPDX-License-Identifier: GPL-2.0+
  2/*
  3 * RDA8810PL SoC irqchip driver
  4 *
  5 * Copyright RDA Microelectronics Company Limited
  6 * Copyright (c) 2017 Andreas Färber
  7 * Copyright (c) 2018 Manivannan Sadhasivam
  8 */
  9
 10#include <linux/init.h>
 11#include <linux/interrupt.h>
 12#include <linux/irq.h>
 13#include <linux/irqchip.h>
 14#include <linux/irqdomain.h>
 15#include <linux/of_address.h>
 16
 17#include <asm/exception.h>
 18
 19#define RDA_INTC_FINALSTATUS	0x00
 20#define RDA_INTC_MASK_SET	0x08
 21#define RDA_INTC_MASK_CLR	0x0c
 22
 23#define RDA_IRQ_MASK_ALL	0xFFFFFFFF
 24
 25#define RDA_NR_IRQS 32
 26
 27static void __iomem *rda_intc_base;
 28static struct irq_domain *rda_irq_domain;
 29
 30static void rda_intc_mask_irq(struct irq_data *d)
 31{
 32	writel_relaxed(BIT(d->hwirq), rda_intc_base + RDA_INTC_MASK_CLR);
 33}
 34
 35static void rda_intc_unmask_irq(struct irq_data *d)
 36{
 37	writel_relaxed(BIT(d->hwirq), rda_intc_base + RDA_INTC_MASK_SET);
 38}
 39
 40static int rda_intc_set_type(struct irq_data *data, unsigned int flow_type)
 41{
 42	/* Hardware supports only level triggered interrupts */
 43	if ((flow_type & (IRQF_TRIGGER_HIGH | IRQF_TRIGGER_LOW)) == flow_type)
 44		return 0;
 45
 46	return -EINVAL;
 47}
 48
 49static void __exception_irq_entry rda_handle_irq(struct pt_regs *regs)
 50{
 51	u32 stat = readl_relaxed(rda_intc_base + RDA_INTC_FINALSTATUS);
 52	u32 hwirq;
 53
 54	while (stat) {
 55		hwirq = __fls(stat);
 56		generic_handle_domain_irq(rda_irq_domain, hwirq);
 57		stat &= ~BIT(hwirq);
 58	}
 59}
 60
 61static struct irq_chip rda_irq_chip = {
 62	.name		= "rda-intc",
 63	.irq_mask	= rda_intc_mask_irq,
 64	.irq_unmask	= rda_intc_unmask_irq,
 65	.irq_set_type	= rda_intc_set_type,
 66};
 67
 68static int rda_irq_map(struct irq_domain *d,
 69		       unsigned int virq, irq_hw_number_t hw)
 70{
 71	irq_set_status_flags(virq, IRQ_LEVEL);
 72	irq_set_chip_and_handler(virq, &rda_irq_chip, handle_level_irq);
 73	irq_set_chip_data(virq, d->host_data);
 74	irq_set_probe(virq);
 75
 76	return 0;
 77}
 78
 79static const struct irq_domain_ops rda_irq_domain_ops = {
 80	.map = rda_irq_map,
 81	.xlate = irq_domain_xlate_onecell,
 82};
 83
 84static int __init rda8810_intc_init(struct device_node *node,
 85				    struct device_node *parent)
 86{
 87	rda_intc_base = of_io_request_and_map(node, 0, "rda-intc");
 88	if (IS_ERR(rda_intc_base))
 89		return PTR_ERR(rda_intc_base);
 90
 91	/* Mask all interrupt sources */
 92	writel_relaxed(RDA_IRQ_MASK_ALL, rda_intc_base + RDA_INTC_MASK_CLR);
 93
 94	rda_irq_domain = irq_domain_create_linear(&node->fwnode, RDA_NR_IRQS,
 95						  &rda_irq_domain_ops,
 96						  rda_intc_base);
 97	if (!rda_irq_domain) {
 98		iounmap(rda_intc_base);
 99		return -ENOMEM;
100	}
101
102	set_handle_irq(rda_handle_irq);
103
104	return 0;
105}
106
107IRQCHIP_DECLARE(rda_intc, "rda,8810pl-intc", rda8810_intc_init);