| 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 | */ |
| 24 | static const struct of_device_id |
| 25 | irqchip_of_match_end __used __section("__irqchip_of_table_end"); |
| 26 | |
| 27 | extern struct of_device_id __irqchip_of_table[]; |
| 28 | |
| 29 | void __init irqchip_init(void) |
| 30 | { |
| 31 | of_irq_init(matches: __irqchip_of_table); |
| 32 | acpi_probe_device_table(irqchip); |
| 33 | } |
| 34 | |
| 35 | int 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(child: np); |
| 39 | of_irq_init_cb_t irq_init_cb = of_device_get_match_data(dev: &pdev->dev); |
| 40 | |
| 41 | if (!irq_init_cb) { |
| 42 | of_node_put(node: par_np); |
| 43 | return -EINVAL; |
| 44 | } |
| 45 | |
| 46 | if (par_np == np) |
| 47 | par_np = NULL; |
| 48 | |
| 49 | /* |
| 50 | * If there's a parent interrupt controller and none of the parent irq |
| 51 | * domains have been registered, that means the parent interrupt |
| 52 | * controller has not been initialized yet. it's not time for this |
| 53 | * interrupt controller to initialize. So, defer probe of this |
| 54 | * interrupt controller. The actual initialization callback of this |
| 55 | * interrupt controller can check for specific domains as necessary. |
| 56 | */ |
| 57 | if (par_np && !irq_find_matching_host(node: par_np, bus_token: DOMAIN_BUS_ANY)) { |
| 58 | of_node_put(node: par_np); |
| 59 | return -EPROBE_DEFER; |
| 60 | } |
| 61 | |
| 62 | return irq_init_cb(np, par_np); |
| 63 | } |
| 64 | EXPORT_SYMBOL_GPL(platform_irqchip_probe); |
| 65 |