mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-11 07:34:31 +00:00
bc2df1afb9
It is useful to be able to access the timer before U-Boot has relocated so that we can fully support bootstage. Add new global_data members to support this. Signed-off-by: Simon Glass <sjg@chromium.org>
116 lines
2.6 KiB
C
116 lines
2.6 KiB
C
/*
|
|
* (C) Copyright 2008,2009
|
|
* Graeme Russ, <graeme.russ@gmail.com>
|
|
*
|
|
* (C) Copyright 2002
|
|
* Daniel Engström, Omicron Ceti AB, <daniel@omicron.se>
|
|
*
|
|
* 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 <malloc.h>
|
|
#include <asm/io.h>
|
|
#include <asm/i8254.h>
|
|
#include <asm/ibmpc.h>
|
|
|
|
struct timer_isr_function {
|
|
struct timer_isr_function *next;
|
|
timer_fnc_t *isr_func;
|
|
};
|
|
|
|
static struct timer_isr_function *first_timer_isr;
|
|
static unsigned long system_ticks;
|
|
|
|
/*
|
|
* register_timer_isr() allows multiple architecture and board specific
|
|
* functions to be called every millisecond. Keep the execution time of
|
|
* each function as low as possible
|
|
*/
|
|
int register_timer_isr(timer_fnc_t *isr_func)
|
|
{
|
|
struct timer_isr_function *new_func;
|
|
struct timer_isr_function *temp;
|
|
int flag;
|
|
|
|
new_func = malloc(sizeof(struct timer_isr_function));
|
|
|
|
if (new_func == NULL)
|
|
return 1;
|
|
|
|
new_func->isr_func = isr_func;
|
|
new_func->next = NULL;
|
|
|
|
/*
|
|
* Don't allow timer interrupts while the
|
|
* linked list is being modified
|
|
*/
|
|
flag = disable_interrupts();
|
|
|
|
if (first_timer_isr == NULL) {
|
|
first_timer_isr = new_func;
|
|
} else {
|
|
temp = first_timer_isr;
|
|
while (temp->next != NULL)
|
|
temp = temp->next;
|
|
temp->next = new_func;
|
|
}
|
|
|
|
if (flag)
|
|
enable_interrupts();
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* timer_isr() MUST be the registered interrupt handler for
|
|
*/
|
|
void timer_isr(void *unused)
|
|
{
|
|
struct timer_isr_function *temp = first_timer_isr;
|
|
|
|
system_ticks++;
|
|
|
|
/* Execute each registered function */
|
|
while (temp != NULL) {
|
|
temp->isr_func();
|
|
temp = temp->next;
|
|
}
|
|
}
|
|
|
|
ulong get_timer(ulong base)
|
|
{
|
|
return system_ticks - base;
|
|
}
|
|
|
|
void timer_set_tsc_base(uint64_t new_base)
|
|
{
|
|
gd->arch.tsc_base = new_base;
|
|
}
|
|
|
|
uint64_t timer_get_tsc(void)
|
|
{
|
|
uint64_t time_now;
|
|
|
|
time_now = rdtsc();
|
|
if (!gd->arch.tsc_base)
|
|
gd->arch.tsc_base = time_now;
|
|
|
|
return time_now - gd->arch.tsc_base;
|
|
}
|