188 lines
4.0 KiB
C
188 lines
4.0 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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* Rob Taylor, Flying Pig Systems. robt@flyingpig.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 <mpc824x.h>
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#include <asm/processor.h>
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#include <asm/pci_io.h>
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#include <commproc.h>
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#include "drivers/epic.h"
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/****************************************************************************/
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unsigned decrementer_count; /* count val for 1e6/HZ microseconds */
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static __inline__ unsigned long get_msr (void)
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{
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unsigned long msr;
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asm volatile ("mfmsr %0":"=r" (msr):);
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return msr;
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}
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static __inline__ void set_msr (unsigned long msr)
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{
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asm volatile ("mtmsr %0"::"r" (msr));
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}
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static __inline__ unsigned long get_dec (void)
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{
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unsigned long val;
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asm volatile ("mfdec %0":"=r" (val):);
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return val;
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}
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static __inline__ void set_dec (unsigned long val)
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{
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asm volatile ("mtdec %0"::"r" (val));
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}
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void enable_interrupts (void)
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{
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set_msr (get_msr () | MSR_EE);
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}
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/* returns flag if MSR_EE was set before */
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int disable_interrupts (void)
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{
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ulong msr = get_msr ();
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set_msr (msr & ~MSR_EE);
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return ((msr & MSR_EE) != 0);
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}
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/****************************************************************************/
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int interrupt_init (void)
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{
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decrementer_count = (get_bus_freq (0) / 4) / CFG_HZ;
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/*
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* It's all broken at the moment and I currently don't need
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* interrupts. If you want to fix it, have a look at the epic
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* drivers in dink32 v12. They do everthing and Motorola said
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* I could use the dink source in this project as long as
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* copyright notices remain intact.
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*/
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epicInit (EPIC_DIRECT_IRQ, 0);
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/* EPIC won't generate INT unless Current Task Pri < 15 */
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epicCurTaskPrioSet(0);
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set_dec (decrementer_count);
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set_msr (get_msr () | MSR_EE);
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return (0);
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}
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/****************************************************************************/
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/*
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* Handle external interrupts
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*/
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void external_interrupt (struct pt_regs *regs)
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{
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register unsigned long temp;
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pci_readl (CFG_EUMB_ADDR + EPIC_PROC_INT_ACK_REG, temp);
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sync (); /* i'm not convinced this is needed, but dink source has it */
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temp &= 0xff; /*get vector */
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/*TODO: handle them -... */
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epicEOI ();
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}
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/****************************************************************************/
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/*
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* blank int handlers.
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*/
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void
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irq_install_handler (int vec, interrupt_handler_t * handler, void *arg)
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{
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}
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void irq_free_handler (int vec)
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{
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}
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/*TODO: some handlers for winbond and 87308 interrupts
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and what about generic pci inteerupts?
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vga?
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*/
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volatile ulong timestamp = 0;
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void timer_interrupt (struct pt_regs *regs)
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{
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/* Restore Decrementer Count */
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set_dec (decrementer_count);
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timestamp++;
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#if defined(CONFIG_WATCHDOG)
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if ((timestamp % (CFG_HZ / 2)) == 0) {
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#if defined(CONFIG_OXC)
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{
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extern void oxc_wdt_reset (void);
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oxc_wdt_reset ();
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}
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#endif
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}
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#endif /* CONFIG_WATCHDOG */
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#if defined(CONFIG_SHOW_ACTIVITY) && defined(CONFIG_OXC)
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if ((timestamp % (CFG_HZ / 10)) == 0) {
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{
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extern void oxc_toggle_activeled (void);
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oxc_toggle_activeled ();
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}
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}
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#endif
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}
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void reset_timer (void)
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{
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timestamp = 0;
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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 set_timer (ulong t)
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{
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timestamp = t;
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}
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