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(__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(np); 39 of_irq_init_cb_t irq_init_cb = of_device_get_match_data(&pdev->dev); 40 41 if (!irq_init_cb) { 42 of_node_put(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(par_np, DOMAIN_BUS_ANY)) { 58 of_node_put(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