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, size: sizeof(*irqchip), GFP_KERNEL); |
48 | if (!irqchip) |
49 | return -ENOMEM; |
50 | |
51 | irqchip->regmap = dev_get_regmap(dev: 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(dev: &pdev->dev, propname: "reg" , val: &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 | map: irqchip->regmap, irq, |
73 | IRQF_SHARED | IRQF_ONESHOT, irq_base: 0, |
74 | chip: &irqchip->chip, |
75 | data: &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 | |