linux/drivers/irqchip/irq-sl28cpld.c
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   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.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
  79static const struct of_device_id sl28cpld_intc_of_match[] = {
  80        { .compatible = "kontron,sl28cpld-intc" },
  81        {}
  82};
  83MODULE_DEVICE_TABLE(of, sl28cpld_intc_of_match);
  84
  85static 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};
  92module_platform_driver(sl28cpld_intc_driver);
  93
  94MODULE_DESCRIPTION("sl28cpld Interrupt Controller Driver");
  95MODULE_AUTHOR("Michael Walle <michael@walle.cc>");
  96MODULE_LICENSE("GPL");
  97