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113 lines
2.4 KiB
C
113 lines
2.4 KiB
C
/*
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* (C) Copyright 2000-2002
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* (C) Copyright 2003
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* Gleb Natapov <gnatapov@mrv.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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* 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 <asm/processor.h>
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#include <asm/irq.h>
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/* Implemented by SPARC CPUs */
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extern int interrupt_init_cpu(void);
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extern void timer_interrupt_cpu(void *arg);
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extern int timer_interrupt_init_cpu(void);
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int intLock(void)
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{
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unsigned int pil;
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pil = get_pil();
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/* set PIL to 15 ==> no pending interrupts will interrupt CPU */
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set_pil(15);
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return pil;
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}
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void intUnlock(int oldLevel)
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{
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set_pil(oldLevel);
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}
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void enable_interrupts(void)
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{
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set_pil(0); /* enable all interrupts */
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}
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int disable_interrupts(void)
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{
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return intLock();
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}
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int interrupt_init(void)
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{
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int ret;
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/* call cpu specific function from $(CPU)/interrupts.c */
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ret = interrupt_init_cpu();
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/* enable global interrupts */
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enable_interrupts();
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return ret;
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}
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/* timer interrupt/overflow counter */
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static volatile ulong timestamp = 0;
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/* regs can not be used here! regs is actually the pointer given in
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* irq_install_handler
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*/
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void timer_interrupt(struct pt_regs *regs)
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{
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/* call cpu specific function from $(CPU)/interrupts.c */
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timer_interrupt_cpu((void *)regs);
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timestamp++;
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}
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ulong get_timer(ulong base)
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{
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return (timestamp - base);
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}
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void timer_interrupt_init(void)
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{
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int irq;
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timestamp = 0;
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irq = timer_interrupt_init_cpu();
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if (irq < 0) {
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/* cpu specific code handled the interrupt registration it self */
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return;
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}
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/* register interrupt handler for timer */
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irq_install_handler(irq, (void (*)(void *))timer_interrupt, NULL);
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}
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