1 /* 2 * Based on arch/arm/kernel/irq.c 3 * 4 * Copyright (C) 1992 Linus Torvalds 5 * Modifications for ARM processor Copyright (C) 1995-2000 Russell King. 6 * Support for Dynamic Tick Timer Copyright (C) 2004-2005 Nokia Corporation. 7 * Dynamic Tick Timer written by Tony Lindgren <tony@atomide.com> and 8 * Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>. 9 * Copyright (C) 2012 ARM Ltd. 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License version 2 as 13 * published by the Free Software Foundation. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program. If not, see <http://www.gnu.org/licenses/>. 22 */ 23 24 #include <linux/kernel_stat.h> 25 #include <linux/irq.h> 26 #include <linux/smp.h> 27 #include <linux/init.h> 28 #include <linux/of_irq.h> 29 #include <linux/seq_file.h> 30 #include <linux/ratelimit.h> 31 32 unsigned long irq_err_count; 33 34 int arch_show_interrupts(struct seq_file *p, int prec) 35 { 36 #ifdef CONFIG_SMP 37 show_ipi_list(p, prec); 38 #endif 39 seq_printf(p, "%*s: %10lu\n", prec, "Err", irq_err_count); 40 return 0; 41 } 42 43 /* 44 * handle_IRQ handles all hardware IRQ's. Decoded IRQs should 45 * not come via this function. Instead, they should provide their 46 * own 'handler'. Used by platform code implementing C-based 1st 47 * level decoding. 48 */ 49 void handle_IRQ(unsigned int irq, struct pt_regs *regs) 50 { 51 struct pt_regs *old_regs = set_irq_regs(regs); 52 53 irq_enter(); 54 55 /* 56 * Some hardware gives randomly wrong interrupts. Rather 57 * than crashing, do something sensible. 58 */ 59 if (unlikely(irq >= nr_irqs)) { 60 pr_warn_ratelimited("Bad IRQ%u\n", irq); 61 ack_bad_irq(irq); 62 } else { 63 generic_handle_irq(irq); 64 } 65 66 irq_exit(); 67 set_irq_regs(old_regs); 68 } 69 70 /* 71 * Interrupt controllers supported by the kernel. 72 */ 73 static const struct of_device_id intctrl_of_match[] __initconst = { 74 /* IRQ controllers { .compatible, .data } info to go here */ 75 {} 76 }; 77 78 void __init init_IRQ(void) 79 { 80 of_irq_init(intctrl_of_match); 81 82 if (!handle_arch_irq) 83 panic("No interrupt controller found."); 84 } 85