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);