65 lines
1.8 KiB
C
65 lines
1.8 KiB
C
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/*
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* Copyright (C) 2012 Thomas Petazzoni
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*
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* Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/acpi.h>
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/of_irq.h>
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#include <linux/irqchip.h>
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#include <linux/platform_device.h>
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/*
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* This special of_device_id is the sentinel at the end of the
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* of_device_id[] array of all irqchips. It is automatically placed at
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* the end of the array by the linker, thanks to being part of a
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* special section.
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*/
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static const struct of_device_id
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irqchip_of_match_end __used __section("__irqchip_of_table_end");
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extern struct of_device_id __irqchip_of_table[];
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void __init irqchip_init(void)
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{
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of_irq_init(__irqchip_of_table);
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acpi_probe_device_table(irqchip);
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}
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int platform_irqchip_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct device_node *par_np = of_irq_find_parent(np);
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of_irq_init_cb_t irq_init_cb = of_device_get_match_data(&pdev->dev);
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if (!irq_init_cb) {
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of_node_put(par_np);
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return -EINVAL;
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}
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if (par_np == np)
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par_np = NULL;
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/*
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* If there's a parent interrupt controller and none of the parent irq
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* domains have been registered, that means the parent interrupt
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* controller has not been initialized yet. it's not time for this
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* interrupt controller to initialize. So, defer probe of this
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* interrupt controller. The actual initialization callback of this
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* interrupt controller can check for specific domains as necessary.
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*/
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if (par_np && !irq_find_matching_host(par_np, DOMAIN_BUS_ANY)) {
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of_node_put(par_np);
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return -EPROBE_DEFER;
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}
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return irq_init_cb(np, par_np);
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}
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EXPORT_SYMBOL_GPL(platform_irqchip_probe);
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