/* * (C) Copyright 2000-2002 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * (C) Copyright 2003 * Gleb Natapov <gnatapov@mrv.com> * * (C) Copyright 2007 * Daniel Hellstrom, Gaisler Research, daniel@gaisler.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 <asm/processor.h> #include <asm/irq.h> /* Implemented by SPARC CPUs */ extern int interrupt_init_cpu(void); extern void timer_interrupt_cpu(void *arg); extern int timer_interrupt_init_cpu(void); int intLock(void) { unsigned int pil; pil = get_pil(); /* set PIL to 15 ==> no pending interrupts will interrupt CPU */ set_pil(15); return pil; } void intUnlock(int oldLevel) { set_pil(oldLevel); } void enable_interrupts(void) { set_pil(0); /* enable all interrupts */ } int disable_interrupts(void) { return intLock(); } int interrupt_init(void) { int ret; /* call cpu specific function from $(CPU)/interrupts.c */ ret = interrupt_init_cpu(); /* enable global interrupts */ enable_interrupts(); return ret; } /* timer interrupt/overflow counter */ static volatile ulong timestamp = 0; /* regs can not be used here! regs is actually the pointer given in * irq_install_handler */ void timer_interrupt(struct pt_regs *regs) { /* call cpu specific function from $(CPU)/interrupts.c */ timer_interrupt_cpu((void *)regs); timestamp++; } void reset_timer(void) { timestamp = 0; } ulong get_timer(ulong base) { return (timestamp - base); } void set_timer(ulong t) { timestamp = t; } void timer_interrupt_init(void) { int irq; reset_timer(); irq = timer_interrupt_init_cpu(); if (irq < 0) { /* cpu specific code handled the interrupt registration it self */ return; } /* register interrupt handler for timer */ irq_install_handler(irq, (void (*)(void *))timer_interrupt, NULL); }