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.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 __free(device_node) = 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
45	if (par_np == np)
46		par_np = NULL;
47
48	/*
49	 * If there's a parent interrupt controller and  none of the parent irq
50	 * domains have been registered, that means the parent interrupt
51	 * controller has not been initialized yet.  it's not time for this
52	 * interrupt controller to initialize. So, defer probe of this
53	 * interrupt controller. The actual initialization callback of this
54	 * interrupt controller can check for specific domains as necessary.
55	 */
56	if (par_np && !irq_find_matching_host(par_np, DOMAIN_BUS_ANY)) {
57		return -EPROBE_DEFER;
58	}
59
60	return irq_init_cb(np, par_np);
61}
62EXPORT_SYMBOL_GPL(platform_irqchip_probe);