Release 4.14 arch/microblaze/kernel/heartbeat.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/sched/loadavg.h>
#include <linux/io.h>

#include <asm/setup.h>
#include <asm/page.h>
#include <asm/prom.h>


static unsigned int base_addr;



void microblaze_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;
		}
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Michal Simek
105
99.06%
1
50.00%
Guenter Roeck
1
0.94%
1
50.00%
Total
106
100.00%
2
100.00%



void microblaze_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);
	}
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Michal Simek
120
85.71%
3
50.00%
John Linn
17
12.14%
1
16.67%
Joe Perches
2
1.43%
1
16.67%
Guenter Roeck
1
0.71%
1
16.67%
Total
140
100.00%
6
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Michal Simek
246
91.11%
3
42.86%
John Linn
17
6.30%
1
14.29%
Ingo Molnar
3
1.11%
1
14.29%
Guenter Roeck
2
0.74%
1
14.29%
Joe Perches
2
0.74%
1
14.29%
Total
270
100.00%
7
100.00%
Directory: arch/microblaze/kernel

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