mirror of
https://github.com/AsahiLinux/u-boot
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121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
/*
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* (C) Copyright 2011, Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
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* (C) Copyright 2011, Julius Baxter <julius@opencores.org>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/types.h>
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#include <asm/ptrace.h>
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#include <asm/system.h>
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#include <asm/openrisc_exc.h>
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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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int count;
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};
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static struct irq_action handlers[32];
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void interrupt_handler(void)
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{
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int irq;
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while ((irq = ffs(mfspr(SPR_PICSR)))) {
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if (handlers[--irq].handler) {
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handlers[irq].handler(handlers[irq].arg);
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handlers[irq].count++;
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} else {
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/* disable the interrupt */
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mtspr(SPR_PICMR, mfspr(SPR_PICMR) & ~(1 << irq));
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printf("Unhandled interrupt: %d\n", irq);
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}
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/* clear the interrupt */
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mtspr(SPR_PICSR, mfspr(SPR_PICSR) & ~(1 << irq));
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}
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}
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int interrupt_init(void)
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{
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/* install handler for external interrupt exception */
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exception_install_handler(EXC_EXT_IRQ, interrupt_handler);
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/* Enable interrupts in supervisor register */
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mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_IEE);
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return 0;
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}
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void enable_interrupts(void)
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{
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/* Set interrupt enable bit in supervisor register */
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mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_IEE);
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/* Enable timer exception */
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mtspr(SPR_SR, mfspr(SPR_SR) | SPR_SR_TEE);
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}
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int disable_interrupts(void)
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{
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/* Clear interrupt enable bit in supervisor register */
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mtspr(SPR_SR, mfspr(SPR_SR) & ~SPR_SR_IEE);
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/* Disable timer exception */
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mtspr(SPR_SR, mfspr(SPR_SR) & ~SPR_SR_TEE);
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return 0;
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}
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void irq_install_handler(int irq, interrupt_handler_t *handler, void *arg)
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{
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if (irq < 0 || irq > 31)
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return;
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handlers[irq].handler = handler;
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handlers[irq].arg = arg;
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}
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void irq_free_handler(int irq)
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{
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if (irq < 0 || irq > 31)
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return;
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handlers[irq].handler = 0;
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handlers[irq].arg = 0;
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}
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#if defined(CONFIG_CMD_IRQ)
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int do_irqinfo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
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{
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int i;
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printf("\nInterrupt-Information:\n\n");
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printf("Nr Routine Arg Count\n");
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printf("-----------------------------\n");
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for (i = 0; i < 32; i++) {
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if (handlers[i].handler) {
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printf("%02d %08lx %08lx %d\n",
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i,
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(ulong)handlers[i].handler,
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(ulong)handlers[i].arg,
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handlers[i].count);
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}
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}
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printf("\n");
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return 0;
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}
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#endif
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