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/***********************license start***********************************
* Copyright (c) 2003-2017 Cavium Inc. (support@cavium.com). All rights
* reserved.
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* * Neither the name of Cavium Inc. nor the names of
* its contributors may be used to endorse or promote products
* derived from this software without specific prior written
* permission.
*
* This Software, including technical data, may be subject to U.S. export
* control laws, including the U.S. Export Administration Act and its
* associated regulations, and may be subject to export or import
* regulations in other countries.
*
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
* AND WITH ALL FAULTS AND CAVIUM INC. MAKES NO PROMISES, REPRESENTATIONS OR
* WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT
* TO THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY
* REPRESENTATION OR DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT
* DEFECTS, AND CAVIUM SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES
* OF TITLE, MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR
* PURPOSE, LACK OF VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT,
* QUIET POSSESSION OR CORRESPONDENCE TO DESCRIPTION. THE ENTIRE RISK
* ARISING OUT OF USE OR PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
***********************license end**************************************/
#include <bdk.h>
#include "libbdk-arch/bdk-csrs-gti.h"
/**
* Setup the watchdog to expire in timeout_ms milliseconds. When the watchdog
* expires, the chip three things happen:
* 1) Expire 1: interrupt that is ignored by the BDK
* 2) Expire 2: DEL3T interrupt, which is disabled and ignored
* 3) Expire 3: Soft reset of the chip
*
* Since we want a soft reset, we actually program the watchdog to expire at
* the timeout / 3.
*
* @param timeout_ms Timeout in milliseconds. If this is zero, the timeout is taken from the
* global configuration option BDK_BRD_CFG_WATCHDOG_TIMEOUT
*/
void bdk_watchdog_set(unsigned int timeout_ms)
{
if (timeout_ms == 0)
timeout_ms = bdk_config_get_int(BDK_CONFIG_WATCHDOG_TIMEOUT);
if (timeout_ms > 0)
{
uint64_t sclk = bdk_clock_get_rate(bdk_numa_local(), BDK_CLOCK_SCLK);
uint64_t timeout_sclk = sclk * timeout_ms / 1000;
/* Per comment above, we want the watchdog to expire at 3x the rate specified */
timeout_sclk /= 3;
/* Watchdog counts in 1024 cycle steps */
uint64_t timeout_wdog = timeout_sclk >> 10;
/* We can only specify the upper 16 bits of a 24 bit value. Round up */
timeout_wdog = (timeout_wdog + 0xff) >> 8;
/* If the timeout overflows the hardware limit, set max */
if (timeout_wdog >= 0x10000)
timeout_wdog = 0xffff;
BDK_TRACE(INIT, "Watchdog: Set to expire %lu SCLK cycles\n", timeout_wdog << 18);
BDK_CSR_MODIFY(c, bdk_numa_local(), BDK_GTI_CWD_WDOGX(bdk_get_core_num()),
c.s.len = timeout_wdog;
c.s.mode = 3);
}
}
/**
* Signal the watchdog that we are still running
*/
void bdk_watchdog_poke(void)
{
BDK_CSR_WRITE(bdk_numa_local(), BDK_GTI_CWD_POKEX(bdk_get_core_num()), 0);
}
/**
* Disable the hardware watchdog
*/
void bdk_watchdog_disable(void)
{
BDK_CSR_WRITE(bdk_numa_local(), BDK_GTI_CWD_WDOGX(bdk_get_core_num()), 0);
BDK_TRACE(INIT, "Watchdog: Disabled\n");
}
/**
* Return true if the watchdog is configured and running
*
* @return Non-zero if watchdog is running
*/
int bdk_watchdog_is_running(void)
{
BDK_CSR_INIT(wdog, bdk_numa_local(), BDK_GTI_CWD_WDOGX(bdk_get_core_num()));
return wdog.s.mode != 0;
}
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