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