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
27 static void __iomem *rda_intc_base;
28 static struct irq_domain *rda_irq_domain;
29
rda_intc_mask_irq(struct irq_data * d)30 static 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
rda_intc_unmask_irq(struct irq_data * d)35 static 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
rda_intc_set_type(struct irq_data * data,unsigned int flow_type)40 static 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
rda_handle_irq(struct pt_regs * regs)49 static 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
61 static 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
rda_irq_map(struct irq_domain * d,unsigned int virq,irq_hw_number_t hw)68 static 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
79 static const struct irq_domain_ops rda_irq_domain_ops = {
80 .map = rda_irq_map,
81 .xlate = irq_domain_xlate_onecell,
82 };
83
rda8810_intc_init(struct device_node * node,struct device_node * parent)84 static 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
107 IRQCHIP_DECLARE(rda_intc, "rda,8810pl-intc", rda8810_intc_init);
108