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107 lines · 2.5 KiB

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);