79c157a3fb
microblaze:allmodconfig complains for some configurations that 'heartbeat' is redefined as different kind of symbol. This is seen in test compiles of watchdog drivers, which often use 'heartbeat' as ststic variable. Since 'heartbeat' is an unfortunate name for a global function, rename it to microblaze_heartbeat. Also rename the setup function to microblaze_setup_heartbeat. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
72 lines
1.6 KiB
C
72 lines
1.6 KiB
C
/*
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* Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
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* Copyright (C) 2007-2009 PetaLogix
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* Copyright (C) 2006 Atmark Techno, Inc.
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*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*/
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#include <linux/sched.h>
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#include <linux/io.h>
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#include <asm/setup.h>
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#include <asm/page.h>
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#include <asm/prom.h>
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static unsigned int base_addr;
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void microblaze_heartbeat(void)
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{
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static unsigned int cnt, period, dist;
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if (base_addr) {
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if (cnt == 0 || cnt == dist)
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out_be32(base_addr, 1);
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else if (cnt == 7 || cnt == dist + 7)
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out_be32(base_addr, 0);
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if (++cnt > period) {
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cnt = 0;
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/*
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* The hyperbolic function below modifies the heartbeat
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* period length in dependency of the current (5min)
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* load. It goes through the points f(0)=126, f(1)=86,
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* f(5)=51, f(inf)->30.
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*/
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period = ((672 << FSHIFT) / (5 * avenrun[0] +
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(7 << FSHIFT))) + 30;
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dist = period / 4;
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}
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}
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}
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void microblaze_setup_heartbeat(void)
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{
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struct device_node *gpio = NULL;
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int *prop;
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int j;
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const char * const gpio_list[] = {
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"xlnx,xps-gpio-1.00.a",
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NULL
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};
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for (j = 0; gpio_list[j] != NULL; j++) {
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gpio = of_find_compatible_node(NULL, NULL, gpio_list[j]);
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if (gpio)
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break;
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}
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if (gpio) {
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base_addr = be32_to_cpup(of_get_property(gpio, "reg", NULL));
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base_addr = (unsigned long) ioremap(base_addr, PAGE_SIZE);
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pr_notice("Heartbeat GPIO at 0x%x\n", base_addr);
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/* GPIO is configured as output */
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prop = (int *) of_get_property(gpio, "xlnx,is-bidir", NULL);
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if (prop)
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out_be32(base_addr + 4, 0);
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}
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}
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