1 /* 2 * (C) Copyright 2009 3 * Graeme Russ, <graeme.russ@gmail.com> 4 * 5 * (C) Copyright 2007 6 * Daniel Hellstrom, Gaisler Research, <daniel@gaisler.com> 7 * 8 * (C) Copyright 2006 9 * Detlev Zundel, DENX Software Engineering, <dzu@denx.de> 10 * 11 * (C) Copyright -2003 12 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de> 13 * 14 * (C) Copyright 2002 15 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se> 16 * 17 * (C) Copyright 2001 18 * Josh Huber, Mission Critical Linux, Inc, <huber@mclx.com> 19 * 20 * SPDX-License-Identifier: GPL-2.0+ 21 */ 22 23 /* 24 * This file contains the high-level API for the interrupt sub-system 25 * of the x86 port of U-Boot. Most of the functionality has been 26 * shamelessly stolen from the leon2 / leon3 ports of U-Boot. 27 * Daniel Hellstrom, Detlev Zundel, Wolfgang Denk and Josh Huber are 28 * credited for the corresponding work on those ports. The original 29 * interrupt handling routines for the x86 port were written by 30 * Daniel Engström 31 */ 32 33 #include <common.h> 34 #include <asm/interrupt.h> 35 36 struct irq_action { 37 interrupt_handler_t *handler; 38 void *arg; 39 unsigned int count; 40 }; 41 42 static struct irq_action irq_handlers[CONFIG_SYS_NUM_IRQS] = { {0} }; 43 static int spurious_irq_cnt; 44 static int spurious_irq; 45 46 void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg) 47 { 48 int status; 49 50 if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) { 51 printf("irq_install_handler: bad irq number %d\n", irq); 52 return; 53 } 54 55 if (irq_handlers[irq].handler != NULL) 56 printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n", 57 (ulong) handler, 58 (ulong) irq_handlers[irq].handler); 59 60 status = disable_interrupts(); 61 62 irq_handlers[irq].handler = handler; 63 irq_handlers[irq].arg = arg; 64 irq_handlers[irq].count = 0; 65 66 unmask_irq(irq); 67 68 if (status) 69 enable_interrupts(); 70 71 return; 72 } 73 74 void irq_free_handler(int irq) 75 { 76 int status; 77 78 if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) { 79 printf("irq_free_handler: bad irq number %d\n", irq); 80 return; 81 } 82 83 status = disable_interrupts(); 84 85 mask_irq(irq); 86 87 irq_handlers[irq].handler = NULL; 88 irq_handlers[irq].arg = NULL; 89 90 if (status) 91 enable_interrupts(); 92 93 return; 94 } 95 96 void do_irq(int hw_irq) 97 { 98 int irq = hw_irq - 0x20; 99 100 if (irq < 0 || irq >= CONFIG_SYS_NUM_IRQS) { 101 printf("do_irq: bad irq number %d\n", irq); 102 return; 103 } 104 105 if (irq_handlers[irq].handler) { 106 mask_irq(irq); 107 108 irq_handlers[irq].handler(irq_handlers[irq].arg); 109 irq_handlers[irq].count++; 110 111 unmask_irq(irq); 112 specific_eoi(irq); 113 114 } else { 115 if ((irq & 7) != 7) { 116 spurious_irq_cnt++; 117 spurious_irq = irq; 118 } 119 } 120 } 121 122 #if defined(CONFIG_CMD_IRQ) 123 int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) 124 { 125 int irq; 126 127 printf("Spurious IRQ: %u, last unknown IRQ: %d\n", 128 spurious_irq_cnt, spurious_irq); 129 130 printf("Interrupt-Information:\n"); 131 printf("Nr Routine Arg Count\n"); 132 133 for (irq = 0; irq <= CONFIG_SYS_NUM_IRQS; irq++) { 134 if (irq_handlers[irq].handler != NULL) { 135 printf("%02d %08lx %08lx %d\n", 136 irq, 137 (ulong)irq_handlers[irq].handler, 138 (ulong)irq_handlers[irq].arg, 139 irq_handlers[irq].count); 140 } 141 } 142 143 return 0; 144 } 145 #endif 146