181 lines
3.6 KiB
C
181 lines
3.6 KiB
C
/*
|
|
* (C) Copyright -2003
|
|
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
|
|
*
|
|
* (C) Copyright 2001
|
|
* Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/*
|
|
* interrupts.c - just enough support for the decrementer/timer
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <asm/processor.h>
|
|
#include <command.h>
|
|
|
|
/****************************************************************************/
|
|
|
|
unsigned decrementer_count; /* count value for 1e6/HZ microseconds */
|
|
|
|
/****************************************************************************/
|
|
|
|
static __inline__ unsigned long
|
|
get_msr(void)
|
|
{
|
|
unsigned long msr;
|
|
|
|
asm volatile("mfmsr %0" : "=r" (msr) :);
|
|
return msr;
|
|
}
|
|
|
|
static __inline__ void
|
|
set_msr(unsigned long msr)
|
|
{
|
|
asm volatile("mtmsr %0" : : "r" (msr));
|
|
}
|
|
|
|
static __inline__ unsigned long
|
|
get_dec(void)
|
|
{
|
|
unsigned long val;
|
|
|
|
asm volatile("mfdec %0" : "=r" (val) :);
|
|
return val;
|
|
}
|
|
|
|
|
|
static __inline__ void
|
|
set_dec(unsigned long val)
|
|
{
|
|
asm volatile("mtdec %0" : : "r" (val));
|
|
}
|
|
|
|
|
|
void
|
|
enable_interrupts(void)
|
|
{
|
|
set_msr (get_msr() | MSR_EE);
|
|
}
|
|
|
|
/* returns flag if MSR_EE was set before */
|
|
int
|
|
disable_interrupts(void)
|
|
{
|
|
ulong msr = get_msr();
|
|
set_msr (msr & ~MSR_EE);
|
|
return ((msr & MSR_EE) != 0);
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
int interrupt_init(void)
|
|
{
|
|
decrementer_count = get_tbclk() / CFG_HZ;
|
|
|
|
#ifdef DEBUG
|
|
puts("interrupt_init: setting actual decremter\n");
|
|
#endif
|
|
set_dec (get_tbclk() / CFG_HZ);
|
|
|
|
#ifdef DEBUG
|
|
printf("interrupt_init: enabling interrupts (msr = %08lx)\n",
|
|
get_msr());
|
|
#endif
|
|
set_msr (get_msr() | MSR_EE);
|
|
|
|
#ifdef DEBUG
|
|
printf("interrupt_init: done. (msr = %08lx)\n", get_msr());
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
/*
|
|
* Handle external interrupts
|
|
*/
|
|
void
|
|
external_interrupt(struct pt_regs *regs)
|
|
{
|
|
puts("external_interrupt (oops!)\n");
|
|
}
|
|
|
|
volatile ulong timestamp = 0;
|
|
|
|
/*
|
|
* timer_interrupt - gets called when the decrementer overflows,
|
|
* with interrupts disabled.
|
|
* Trivial implementation - no need to be really accurate.
|
|
*/
|
|
void
|
|
timer_interrupt(struct pt_regs *regs)
|
|
{
|
|
set_dec(decrementer_count);
|
|
timestamp++;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
void
|
|
reset_timer(void)
|
|
{
|
|
timestamp = 0;
|
|
}
|
|
|
|
ulong
|
|
get_timer(ulong base)
|
|
{
|
|
return (timestamp - base);
|
|
}
|
|
|
|
void
|
|
set_timer(ulong t)
|
|
{
|
|
timestamp = t;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
/*
|
|
* Install and free a interrupt handler.
|
|
*/
|
|
|
|
void
|
|
irq_install_handler(int vec, interrupt_handler_t *handler, void *arg)
|
|
{
|
|
|
|
}
|
|
|
|
void
|
|
irq_free_handler(int vec)
|
|
{
|
|
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
void
|
|
do_irqinfo(cmd_tbl_t *cmdtp, bd_t *bd, int flag, int argc, char *argv[])
|
|
{
|
|
puts("IRQ related functions are unimplemented currently.\n");
|
|
}
|