mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-20 19:23:57 +08:00
6bd55f0bba
Fix coding style issues reported by checkpatch.pl. Signed-off-by: Michal Simek <monstr@monstr.eu>
72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
/*
|
|
* Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
|
|
* Copyright (C) 2007-2009 PetaLogix
|
|
* Copyright (C) 2006 Atmark Techno, Inc.
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
|
|
#include <linux/sched.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <asm/setup.h>
|
|
#include <asm/page.h>
|
|
#include <asm/prom.h>
|
|
|
|
static unsigned int base_addr;
|
|
|
|
void heartbeat(void)
|
|
{
|
|
static unsigned int cnt, period, dist;
|
|
|
|
if (base_addr) {
|
|
if (cnt == 0 || cnt == dist)
|
|
out_be32(base_addr, 1);
|
|
else if (cnt == 7 || cnt == dist + 7)
|
|
out_be32(base_addr, 0);
|
|
|
|
if (++cnt > period) {
|
|
cnt = 0;
|
|
/*
|
|
* The hyperbolic function below modifies the heartbeat
|
|
* period length in dependency of the current (5min)
|
|
* load. It goes through the points f(0)=126, f(1)=86,
|
|
* f(5)=51, f(inf)->30.
|
|
*/
|
|
period = ((672 << FSHIFT) / (5 * avenrun[0] +
|
|
(7 << FSHIFT))) + 30;
|
|
dist = period / 4;
|
|
}
|
|
}
|
|
}
|
|
|
|
void setup_heartbeat(void)
|
|
{
|
|
struct device_node *gpio = NULL;
|
|
int *prop;
|
|
int j;
|
|
const char * const gpio_list[] = {
|
|
"xlnx,xps-gpio-1.00.a",
|
|
NULL
|
|
};
|
|
|
|
for (j = 0; gpio_list[j] != NULL; j++) {
|
|
gpio = of_find_compatible_node(NULL, NULL, gpio_list[j]);
|
|
if (gpio)
|
|
break;
|
|
}
|
|
|
|
if (gpio) {
|
|
base_addr = be32_to_cpup(of_get_property(gpio, "reg", NULL));
|
|
base_addr = (unsigned long) ioremap(base_addr, PAGE_SIZE);
|
|
pr_notice("Heartbeat GPIO at 0x%x\n", base_addr);
|
|
|
|
/* GPIO is configured as output */
|
|
prop = (int *) of_get_property(gpio, "xlnx,is-bidir", NULL);
|
|
if (prop)
|
|
out_be32(base_addr + 4, 0);
|
|
}
|
|
}
|