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 
19 static 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 
30 struct sl28cpld_intc {
31 	struct regmap *regmap;
32 	struct regmap_irq_chip chip;
33 	struct regmap_irq_chip_data *irq_data;
34 };
35 
36 static 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 
78 static const struct of_device_id sl28cpld_intc_of_match[] = {
79 	{ .compatible = "kontron,sl28cpld-intc" },
80 	{}
81 };
82 MODULE_DEVICE_TABLE(of, sl28cpld_intc_of_match);
83 
84 static 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 };
91 module_platform_driver(sl28cpld_intc_driver);
92 
93 MODULE_DESCRIPTION("sl28cpld Interrupt Controller Driver");
94 MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
95