1 /* 2 * Copyright (C) 2007 Lemote Inc. & Institute of Computing Technology 3 * Author: Fuxin Zhang, zhangfx@lemote.com 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License as published by the 7 * Free Software Foundation; either version 2 of the License, or (at your 8 * option) any later version. 9 */ 10 #include <linux/delay.h> 11 #include <linux/interrupt.h> 12 13 #include <loongson.h> 14 /* 15 * the first level int-handler will jump here if it is a bonito irq 16 */ bonito_irqdispatch(void)17void bonito_irqdispatch(void) 18 { 19 u32 int_status; 20 int i; 21 22 /* workaround the IO dma problem: let cpu looping to allow DMA finish */ 23 int_status = LOONGSON_INTISR; 24 while (int_status & (1 << 10)) { 25 udelay(1); 26 int_status = LOONGSON_INTISR; 27 } 28 29 /* Get pending sources, masked by current enables */ 30 int_status = LOONGSON_INTISR & LOONGSON_INTEN; 31 32 if (int_status) { 33 i = __ffs(int_status); 34 do_IRQ(LOONGSON_IRQ_BASE + i); 35 } 36 } 37 plat_irq_dispatch(void)38asmlinkage void plat_irq_dispatch(void) 39 { 40 unsigned int pending; 41 42 pending = read_c0_cause() & read_c0_status() & ST0_IM; 43 44 /* machine-specific plat_irq_dispatch */ 45 mach_irq_dispatch(pending); 46 } 47 arch_init_irq(void)48void __init arch_init_irq(void) 49 { 50 /* 51 * Clear all of the interrupts while we change the able around a bit. 52 * int-handler is not on bootstrap 53 */ 54 clear_c0_status(ST0_IM | ST0_BEV); 55 56 /* no steer */ 57 LOONGSON_INTSTEER = 0; 58 59 /* 60 * Mask out all interrupt by writing "1" to all bit position in 61 * the interrupt reset reg. 62 */ 63 LOONGSON_INTENCLR = ~0; 64 65 /* machine specific irq init */ 66 mach_init_irq(); 67 } 68