1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * sl28cpld interrupt controller driver
 4 *
 5 * Copyright 2020 Kontron Europe GmbH
 6 */
 7
 8#include <linux/interrupt.h>
 9#include <linux/kernel.h>
10#include <linux/mod_devicetable.h>
11#include <linux/module.h>
12#include <linux/platform_device.h>
13#include <linux/property.h>
14#include <linux/regmap.h>
15
16#define INTC_IE 0x00
17#define INTC_IP 0x01
18
19static const struct regmap_irq sl28cpld_irqs[] = {
20	REGMAP_IRQ_REG_LINE(0, 8),
21	REGMAP_IRQ_REG_LINE(1, 8),
22	REGMAP_IRQ_REG_LINE(2, 8),
23	REGMAP_IRQ_REG_LINE(3, 8),
24	REGMAP_IRQ_REG_LINE(4, 8),
25	REGMAP_IRQ_REG_LINE(5, 8),
26	REGMAP_IRQ_REG_LINE(6, 8),
27	REGMAP_IRQ_REG_LINE(7, 8),
28};
29
30struct sl28cpld_intc {
31	struct regmap *regmap;
32	struct regmap_irq_chip chip;
33	struct regmap_irq_chip_data *irq_data;
34};
35
36static int sl28cpld_intc_probe(struct platform_device *pdev)
37{
38	struct device *dev = &pdev->dev;
39	struct sl28cpld_intc *irqchip;
40	int irq;
41	u32 base;
42	int ret;
43
44	if (!dev->parent)
45		return -ENODEV;
46
47	irqchip = devm_kzalloc(dev, sizeof(*irqchip), GFP_KERNEL);
48	if (!irqchip)
49		return -ENOMEM;
50
51	irqchip->regmap = dev_get_regmap(dev->parent, NULL);
52	if (!irqchip->regmap)
53		return -ENODEV;
54
55	irq = platform_get_irq(pdev, 0);
56	if (irq < 0)
57		return irq;
58
59	ret = device_property_read_u32(&pdev->dev, "reg", &base);
60	if (ret)
61		return -EINVAL;
62
63	irqchip->chip.name = "sl28cpld-intc";
64	irqchip->chip.irqs = sl28cpld_irqs;
65	irqchip->chip.num_irqs = ARRAY_SIZE(sl28cpld_irqs);
66	irqchip->chip.num_regs = 1;
67	irqchip->chip.status_base = base + INTC_IP;
68	irqchip->chip.unmask_base = base + INTC_IE;
69	irqchip->chip.ack_base = base + INTC_IP;
70
71	return devm_regmap_add_irq_chip_fwnode(dev, dev_fwnode(dev),
72					       irqchip->regmap, irq,
73					       IRQF_SHARED | IRQF_ONESHOT, 0,
74					       &irqchip->chip,
75					       &irqchip->irq_data);
76}
77
78static const struct of_device_id sl28cpld_intc_of_match[] = {
79	{ .compatible = "kontron,sl28cpld-intc" },
80	{}
81};
82MODULE_DEVICE_TABLE(of, sl28cpld_intc_of_match);
83
84static struct platform_driver sl28cpld_intc_driver = {
85	.probe = sl28cpld_intc_probe,
86	.driver = {
87		.name = "sl28cpld-intc",
88		.of_match_table = sl28cpld_intc_of_match,
89	}
90};
91module_platform_driver(sl28cpld_intc_driver);
92
93MODULE_DESCRIPTION("sl28cpld Interrupt Controller Driver");
94MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
95MODULE_LICENSE("GPL");