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/*
* (C) Copyright 2000-2004
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2007 Freescale Semiconductor Inc
* TsiChung Liew (Tsi-Chung.Liew@freescale.com)
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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 <watchdog.h>
#include <asm/processor.h>
#include <asm/immap.h>
#define NR_IRQS (CFG_NUM_IRQS)
/*
* Interrupt vector functions.
*/
struct interrupt_action {
interrupt_handler_t *handler;
void *arg;
};
static struct interrupt_action irq_vecs[NR_IRQS];
static __inline__ unsigned short get_sr (void)
{
unsigned short sr;
asm volatile ("move.w %%sr,%0":"=r" (sr):);
return sr;
}
static __inline__ void set_sr (unsigned short sr)
{
asm volatile ("move.w %0,%%sr"::"r" (sr));
}
/************************************************************************/
/*
* Install and free an interrupt handler
*/
void irq_install_handler (int vec, interrupt_handler_t * handler, void *arg)
{
if ((vec < 0) || (vec > NR_IRQS)) {
printf ("irq_install_handler: wrong interrupt vector %d\n",
vec);
return;
}
irq_vecs[vec].handler = handler;
irq_vecs[vec].arg = arg;
}
void irq_free_handler (int vec)
{
if ((vec < 0) || (vec > NR_IRQS)) {
return;
}
irq_vecs[vec].handler = NULL;
irq_vecs[vec].arg = NULL;
}
void enable_interrupts (void)
{
unsigned short sr;
sr = get_sr ();
set_sr (sr & ~0x0700);
}
int disable_interrupts (void)
{
unsigned short sr;
sr = get_sr ();
set_sr (sr | 0x0700);
return ((sr & 0x0700) == 0); /* return TRUE, if interrupts were enabled before */
}
void int_handler (struct pt_regs *fp)
{
int vec;
vec = (fp->vector >> 2) & 0xff;
if (vec > 0x40)
vec -= 0x40;
else
return;
if (irq_vecs[vec].handler != NULL) {
irq_vecs[vec].handler (irq_vecs[vec].arg);
} else {
printf ("\nBogus External Interrupt Vector %d\n", vec);
}
}
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