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