cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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irq-sl28cpld.c (2366B)

      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");