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