diff options
Diffstat (limited to 'src/vendorcode/cavium/bdk/libbdk-boot/bdk-watchdog.c')
| -rw-r--r-- | src/vendorcode/cavium/bdk/libbdk-boot/bdk-watchdog.c | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/src/vendorcode/cavium/bdk/libbdk-boot/bdk-watchdog.c b/src/vendorcode/cavium/bdk/libbdk-boot/bdk-watchdog.c new file mode 100644 index 0000000000..48f955a7ef --- /dev/null +++ b/src/vendorcode/cavium/bdk/libbdk-boot/bdk-watchdog.c @@ -0,0 +1,108 @@ +/***********************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; +} + |