// SPDX-License-Identifier: GPL-2.0+ /* * (C) Copyright 2009 * Graeme Russ, <graeme.russ@gmail.com> * * (C) Copyright 2007 * Daniel Hellstrom, Gaisler Research, <daniel@gaisler.com> * * (C) Copyright 2006 * Detlev Zundel, DENX Software Engineering, <dzu@denx.de> * * (C) Copyright -2003 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de> * * (C) Copyright 2002 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se> * * (C) Copyright 2001 * Josh Huber, Mission Critical Linux, Inc, <huber@mclx.com> */ /* * This file contains the high-level API for the interrupt sub-system * of the x86 port of U-Boot. Most of the functionality has been * shamelessly stolen from the leon2 / leon3 ports of U-Boot. * Daniel Hellstrom, Detlev Zundel, Wolfgang Denk and Josh Huber are * credited for the corresponding work on those ports. The original * interrupt handling routines for the x86 port were written by * Daniel Engström */ #include <common.h> #include <command.h> #include <irq_func.h> #include <asm/interrupt.h> #if !CONFIG_IS_ENABLED(X86_64) struct irq_action { interrupt_handler_t *handler; void *arg; unsigned int count; }; static struct irq_action irq_handlers[SYS_NUM_IRQS] = { {0} }; static int spurious_irq_cnt; static int spurious_irq; void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg) { int status; if (irq < 0 || irq >= SYS_NUM_IRQS) { printf("irq_install_handler: bad irq number %d\n", irq); return; } if (irq_handlers[irq].handler != NULL) printf("irq_install_handler: 0x%08lx replacing 0x%08lx\n", (ulong) handler, (ulong) irq_handlers[irq].handler); status = disable_interrupts(); irq_handlers[irq].handler = handler; irq_handlers[irq].arg = arg; irq_handlers[irq].count = 0; if (CONFIG_IS_ENABLED(I8259_PIC)) unmask_irq(irq); if (status) enable_interrupts(); return; } void irq_free_handler(int irq) { int status; if (irq < 0 || irq >= SYS_NUM_IRQS) { printf("irq_free_handler: bad irq number %d\n", irq); return; } status = disable_interrupts(); if (CONFIG_IS_ENABLED(I8259_PIC)) mask_irq(irq); irq_handlers[irq].handler = NULL; irq_handlers[irq].arg = NULL; if (status) enable_interrupts(); return; } void do_irq(int hw_irq) { int irq = hw_irq - 0x20; if (irq < 0 || irq >= SYS_NUM_IRQS) { printf("do_irq: bad irq number %d\n", irq); return; } if (irq_handlers[irq].handler) { if (CONFIG_IS_ENABLED(I8259_PIC)) mask_irq(irq); irq_handlers[irq].handler(irq_handlers[irq].arg); irq_handlers[irq].count++; if (CONFIG_IS_ENABLED(I8259_PIC)) { unmask_irq(irq); specific_eoi(irq); } } else { if ((irq & 7) != 7) { spurious_irq_cnt++; spurious_irq = irq; } } } #endif #if defined(CONFIG_CMD_IRQ) int do_irqinfo(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]) { #if !CONFIG_IS_ENABLED(X86_64) struct idt_ptr ptr; int irq; interrupt_read_idt(&ptr); printf("IDT at %lx, size %x\n", ptr.address, ptr.size); printf("Spurious IRQ: %u, last unknown IRQ: %d\n", spurious_irq_cnt, spurious_irq); printf("Interrupt-Information:\n"); printf("Nr Routine Arg Count\n"); for (irq = 0; irq < SYS_NUM_IRQS; irq++) { if (irq_handlers[irq].handler != NULL) { printf("%02d %08lx %08lx %d\n", irq, (ulong)irq_handlers[irq].handler, (ulong)irq_handlers[irq].arg, irq_handlers[irq].count); } } #endif return 0; } #endif