From c2f02da21a3f37f0878554eebc785e04fdc4e128 Mon Sep 17 00:00:00 2001 From: Daniel Hellstrom Date: Fri, 28 Mar 2008 09:47:00 +0100 Subject: SPARC: Added generic support for SPARC architecture. Signed-off-by: Daniel Hellstrom --- lib_sparc/interrupts.c | 122 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 122 insertions(+) create mode 100644 lib_sparc/interrupts.c (limited to 'lib_sparc/interrupts.c') diff --git a/lib_sparc/interrupts.c b/lib_sparc/interrupts.c new file mode 100644 index 000000000..4c73b82a6 --- /dev/null +++ b/lib_sparc/interrupts.c @@ -0,0 +1,122 @@ +/* + * (C) Copyright 2000-2002 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * (C) Copyright 2003 + * Gleb Natapov + * + * (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 +#include +#include + +/* 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); +} -- cgit v1.2.3