1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2007 Lemote Inc. & Institute of Computing Technology 4 * Author: Fuxin Zhang, zhangfx@lemote.com 5 */ 6 #include <linux/delay.h> 7 #include <linux/interrupt.h> 8 9 #include <loongson.h> 10 /* 11 * the first level int-handler will jump here if it is a bonito irq 12 */ bonito_irqdispatch(void)13void bonito_irqdispatch(void) 14 { 15 u32 int_status; 16 int i; 17 18 /* workaround the IO dma problem: let cpu looping to allow DMA finish */ 19 int_status = LOONGSON_INTISR; 20 while (int_status & (1 << 10)) { 21 udelay(1); 22 int_status = LOONGSON_INTISR; 23 } 24 25 /* Get pending sources, masked by current enables */ 26 int_status = LOONGSON_INTISR & LOONGSON_INTEN; 27 28 if (int_status) { 29 i = __ffs(int_status); 30 do_IRQ(LOONGSON_IRQ_BASE + i); 31 } 32 } 33 plat_irq_dispatch(void)34asmlinkage void plat_irq_dispatch(void) 35 { 36 unsigned int pending; 37 38 pending = read_c0_cause() & read_c0_status() & ST0_IM; 39 40 /* machine-specific plat_irq_dispatch */ 41 mach_irq_dispatch(pending); 42 } 43 arch_init_irq(void)44void __init arch_init_irq(void) 45 { 46 /* 47 * Clear all of the interrupts while we change the able around a bit. 48 * int-handler is not on bootstrap 49 */ 50 clear_c0_status(ST0_IM | ST0_BEV); 51 52 /* no steer */ 53 LOONGSON_INTSTEER = 0; 54 55 /* 56 * Mask out all interrupt by writing "1" to all bit position in 57 * the interrupt reset reg. 58 */ 59 LOONGSON_INTENCLR = ~0; 60 61 /* machine specific irq init */ 62 mach_init_irq(); 63 } 64