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