cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

irqchip.c (1836B)


      1/*
      2 * Copyright (C) 2012 Thomas Petazzoni
      3 *
      4 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
      5 *
      6 * This file is licensed under the terms of the GNU General Public
      7 * License version 2.  This program is licensed "as is" without any
      8 * warranty of any kind, whether express or implied.
      9 */
     10
     11#include <linux/acpi.h>
     12#include <linux/init.h>
     13#include <linux/of_device.h>
     14#include <linux/of_irq.h>
     15#include <linux/irqchip.h>
     16#include <linux/platform_device.h>
     17
     18/*
     19 * This special of_device_id is the sentinel at the end of the
     20 * of_device_id[] array of all irqchips. It is automatically placed at
     21 * the end of the array by the linker, thanks to being part of a
     22 * special section.
     23 */
     24static const struct of_device_id
     25irqchip_of_match_end __used __section("__irqchip_of_table_end");
     26
     27extern struct of_device_id __irqchip_of_table[];
     28
     29void __init irqchip_init(void)
     30{
     31	of_irq_init(__irqchip_of_table);
     32	acpi_probe_device_table(irqchip);
     33}
     34
     35int platform_irqchip_probe(struct platform_device *pdev)
     36{
     37	struct device_node *np = pdev->dev.of_node;
     38	struct device_node *par_np = of_irq_find_parent(np);
     39	of_irq_init_cb_t irq_init_cb = of_device_get_match_data(&pdev->dev);
     40
     41	if (!irq_init_cb)
     42		return -EINVAL;
     43
     44	if (par_np == np)
     45		par_np = NULL;
     46
     47	/*
     48	 * If there's a parent interrupt controller and  none of the parent irq
     49	 * domains have been registered, that means the parent interrupt
     50	 * controller has not been initialized yet.  it's not time for this
     51	 * interrupt controller to initialize. So, defer probe of this
     52	 * interrupt controller. The actual initialization callback of this
     53	 * interrupt controller can check for specific domains as necessary.
     54	 */
     55	if (par_np && !irq_find_matching_host(par_np, DOMAIN_BUS_ANY))
     56		return -EPROBE_DEFER;
     57
     58	return irq_init_cb(np, par_np);
     59}
     60EXPORT_SYMBOL_GPL(platform_irqchip_probe);