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