drivers/irqchip/irq-sl28cpld.c

   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.mask_base = base + INTC_IE;
  69         irqchip->chip.mask_invert = true;
  70         irqchip->chip.ack_base = base + INTC_IP;
  71
  72         return devm_regmap_add_irq_chip_fwnode(dev, dev_fwnode(dev),
  73                                                irqchip->regmap, irq,
  74                                                IRQF_SHARED | IRQF_ONESHOT, 0,
  75                                                &irqchip->chip,
  76                                                &irqchip->irq_data);
  77 }
  78
  79 static const struct of_device_id sl28cpld_intc_of_match[] = {
  80         { .compatible = "kontron,sl28cpld-intc" },
  81         {}
  82 };
  83 MODULE_DEVICE_TABLE(of, sl28cpld_intc_of_match);
  84
  85 static struct platform_driver sl28cpld_intc_driver = {
  86         .probe = sl28cpld_intc_probe,
  87         .driver = {
  88                 .name = "sl28cpld-intc",
  89                 .of_match_table = sl28cpld_intc_of_match,
  90         }
  91 };
  92 module_platform_driver(sl28cpld_intc_driver);
  93
  94 MODULE_DESCRIPTION("sl28cpld Interrupt Controller Driver");
  95 MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
  96 MODULE_LICENSE("GPL");