nrf52_wdt: split into low-level API and watchdog driver lower-half
This separation allows to interact with the watchdog from OS code, for example initiating the watchdog very early on boot. Moreover, these changes make the lower-half driver support an already running watchdog, which may happen if there's a bootloader which already started it.
This commit is contained in:
Matias N
Alan Carvalho de Assis
parent
d6686b7409
commit
4cbfbd0c74
@ -115,6 +115,10 @@ endif
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ifeq ($(CONFIG_NRF52_WDT),y)
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CHIP_CSRCS += nrf52_wdt.c
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ifeq ($(CONFIG_WATCHDOG),y)
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CHIP_CSRCS += nrf52_wdt_lowerhalf.c
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endif
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endif
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ifeq ($(CONFIG_NRF52_RNG),y)
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@ -154,4 +158,4 @@ endif
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ifeq ($(CONFIG_NRF52_SAADC),y)
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CHIP_CSRCS += nrf52_adc.c
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endif
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endif
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@ -106,7 +106,7 @@
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/* CONFIG Register */
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#define WDT_CONFIG_SLEEP (1 << 0) /* Bit 0: */
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#define WDT_CONFIG_HALT (1 << 0) /* Bit 3: */
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#define WDT_CONFIG_HALT (1 << 3) /* Bit 3: */
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/* RR[x] Register */
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@ -39,16 +39,6 @@
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****************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/arch.h>
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#include <stdint.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/irq.h>
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#include <nuttx/clock.h>
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#include <nuttx/timers/watchdog.h>
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#include <arch/board/board.h>
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#include "chip.h"
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#include "arm_arch.h"
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@ -57,106 +47,30 @@
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#include "hardware/nrf52_wdt.h"
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#include "nrf52_wdt.h"
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#if defined(CONFIG_WATCHDOG) && defined(CONFIG_NRF52_WDT)
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Clocking *****************************************************************/
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/* The watchdog is always running under 32.768KHz:
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*
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* Fmin = Flsi / 32768
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*
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* So the maximum delay (in milliseconds) is then:
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*
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* 1000 * WDT_MAX_VALUE / 32768
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*
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* For example, if Flsi = 30Khz (the nominal, uncalibrated value), then the
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* maximum delay is:
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*
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* Fmin = 0.03 ms
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* Fmax = 131702 Sec
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*/
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#define WDT_FMIN (1)
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#define WDT_MAXTIMEOUT (1000 * (UINT32_MAX / 32768))
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/* Configuration ************************************************************/
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/* There are the options:
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*
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* WDT_CONFIG_MODE - WDT behavior in CPU SLEEP or HALT mode
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* <1=> Run in SLEEP, Pause in HALT
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* <8=> Pause in SLEEP, Run in HALT
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* <9=> Run in SLEEP and HALT
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* <0=> Pause in SLEEP and HALT
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*/
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#define NRF_WDT_BEHAVIOUR_PAUSE_SLEEP_HALT 0
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#define WDT_CONFIG_MODE NRF_WDT_BEHAVIOUR_PAUSE_SLEEP_HALT
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#define WDT_CONFIG_IRQ_PRIORITY 7
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/* This structure provides the private representation of the "lower-half"
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* driver state structure. This structure must be cast-compatible with the
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* well-known watchdog_lowerhalf_s structure.
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*/
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struct nrf52_wdt_lowerhalf_s
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{
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FAR const struct watchdog_ops_s *ops; /* Lower half operations */
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uint32_t timeout; /* The (actual) timeout */
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uint32_t lastreset; /* The last reset time */
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bool started; /* true: The watchdog timer has been started */
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uint16_t reload; /* Timer reload value */
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uint16_t mode; /* watchdog mode under sleep and halt of CPU */
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* "Lower half" driver methods **********************************************/
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static int nrf52_start(FAR struct watchdog_lowerhalf_s *lower);
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static int nrf52_stop(FAR struct watchdog_lowerhalf_s *lower);
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static int nrf52_keepalive(FAR struct watchdog_lowerhalf_s *lower);
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static int nrf52_getstatus(FAR struct watchdog_lowerhalf_s *lower,
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FAR struct watchdog_status_s *status);
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static int nrf52_settimeout(FAR struct watchdog_lowerhalf_s *lower,
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uint32_t timeout);
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* "Lower half" driver methods */
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static const struct watchdog_ops_s g_wdtops =
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{
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.start = nrf52_start,
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.stop = nrf52_stop,
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.keepalive = nrf52_keepalive,
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.getstatus = nrf52_getstatus,
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.settimeout = nrf52_settimeout,
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.capture = NULL,
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.ioctl = NULL,
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};
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/* "Lower half" driver state */
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static struct nrf52_wdt_lowerhalf_s g_wdtdev;
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nrf52_wdt_int_enable
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*
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@ -171,7 +85,7 @@ static struct nrf52_wdt_lowerhalf_s g_wdtdev;
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*
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****************************************************************************/
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static void nrf52_wdt_int_enable(uint32_t int_mask)
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void nrf52_wdt_int_enable(uint32_t int_mask)
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{
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putreg32(int_mask, NRF52_WDT_INTENSET);
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}
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@ -190,11 +104,33 @@ static void nrf52_wdt_int_enable(uint32_t int_mask)
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*
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****************************************************************************/
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static void nrf52_wdt_task_trigger(void)
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void nrf52_wdt_task_trigger(void)
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{
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putreg32(1, NRF52_WDT_TASKS_START);
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}
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/****************************************************************************
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* Name: nrf52_wdt_reload_register_enable
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*
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* Description:
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* Enable/disable a given reload register
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*
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* Input Parameter:
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* rr_register - Reload request register
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* enable - true to enable, false to disable
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*
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* Returned Values:
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* None
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*
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****************************************************************************/
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void nrf52_wdt_reload_register_enable(int rr_register, bool enable)
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{
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modifyreg32(NRF52_WDT_RREN,
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enable ? 0 : WDT_RREN_RR(rr_register),
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enable ? WDT_RREN_RR(rr_register) : 0);
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}
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/****************************************************************************
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* Name: nrf52_wdt_reload_request_set
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*
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@ -209,7 +145,7 @@ static void nrf52_wdt_task_trigger(void)
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*
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****************************************************************************/
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static void nrf52_wdt_reload_request_set(int rr_register)
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void nrf52_wdt_reload_request_set(int rr_register)
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{
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/* Each register is 32-bit (4 bytes), then multiply by 4 to get offset */
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@ -230,7 +166,7 @@ static void nrf52_wdt_reload_request_set(int rr_register)
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*
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****************************************************************************/
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static void nrf52_wdt_behaviour_set(int behaviour)
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void nrf52_wdt_behaviour_set(int behaviour)
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{
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putreg32(behaviour, NRF52_WDT_CONFIG);
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}
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@ -249,281 +185,39 @@ static void nrf52_wdt_behaviour_set(int behaviour)
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*
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****************************************************************************/
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static void nrf52_wdt_reload_value_set(uint32_t reload_value)
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void nrf52_wdt_reload_value_set(uint32_t reload_value)
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{
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putreg32(reload_value, NRF52_WDT_CRV);
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}
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/****************************************************************************
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* Name: nrf52_start
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* Name: nrf52_wdt_reload_value_get
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*
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* Description:
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* Start the watchdog timer, resetting the time to the current timeout,
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*
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* Input Parameters:
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* lower - A pointer the publicly visible representation of the
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* "lower-half" driver state structure.
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* Read the watchdog reload value
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*
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* Returned Values:
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* Zero on success; a negated errno value on failure.
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* Watchdog counter initial value
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*
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****************************************************************************/
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static int nrf52_start(FAR struct watchdog_lowerhalf_s *lower)
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uint32_t nrf52_wdt_reload_value_get(void)
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{
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FAR struct nrf52_wdt_lowerhalf_s *priv =
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(FAR struct nrf52_wdt_lowerhalf_s *)lower;
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irqstate_t flags;
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wdinfo("Entry: started=%d\n");
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DEBUGASSERT(priv);
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/* Have we already been started? */
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if (!priv->started)
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{
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flags = enter_critical_section();
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priv->lastreset = clock_systime_ticks();
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priv->started = true;
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nrf52_wdt_int_enable(WDT_INT_TIMEOUT);
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nrf52_wdt_task_trigger();
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leave_critical_section(flags);
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}
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return OK;
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return getreg32(NRF52_WDT_CRV);
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}
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/****************************************************************************
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* Name: nrf52_stop
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* Name: nrf52_wdt_running
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*
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* Description:
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* Stop the watchdog timer
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*
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* Input Parameters:
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* lower - A pointer the publicly visible representation of the
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* "lower-half" driver state structure.
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* Check if watchdog is running
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*
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* Returned Values:
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* Zero on success; a negated errno value on failure.
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* true if watchdog is running, false otherwise
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*
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****************************************************************************/
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static int nrf52_stop(FAR struct watchdog_lowerhalf_s *lower)
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bool nrf52_wdt_running(void)
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{
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/* There is no way to disable the WDT timer once it has been started */
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wdinfo("Entry\n");
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return -ENOSYS;
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return getreg32(NRF52_WDT_RUNSTATUS);
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}
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/****************************************************************************
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* Name: nrf52_keepalive
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*
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* Description:
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* Reset the watchdog timer to the current timeout value, prevent any
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* imminent watchdog timeouts. This is sometimes referred as "pinging"
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* the watchdog timer or "petting the dog".
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*
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* Input Parameters:
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* lower - A pointer the publicly visible representation of the
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* "lower-half" driver state structure.
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*
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* Returned Values:
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* Zero on success; a negated errno value on failure.
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*
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****************************************************************************/
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static int nrf52_keepalive(FAR struct watchdog_lowerhalf_s *lower)
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{
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FAR struct nrf52_wdt_lowerhalf_s *priv =
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(FAR struct nrf52_wdt_lowerhalf_s *)lower;
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irqstate_t flags;
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wdinfo("Entry\n");
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/* Reload the WDT timer */
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flags = enter_critical_section();
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priv->lastreset = clock_systime_ticks();
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nrf52_wdt_reload_request_set(0);
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leave_critical_section(flags);
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return OK;
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}
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/****************************************************************************
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* Name: nrf52_getstatus
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*
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* Description:
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* Get the current watchdog timer status
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*
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* Input Parameters:
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* lower - A pointer the publicly visible representation of
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* the "lower-half" driver state structure.
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* status - The location to return the watchdog status information.
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*
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* Returned Values:
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* Zero on success; a negated errno value on failure.
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*
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****************************************************************************/
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static int nrf52_getstatus(FAR struct watchdog_lowerhalf_s *lower,
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FAR struct watchdog_status_s *status)
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{
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FAR struct nrf52_wdt_lowerhalf_s *priv =
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(FAR struct nrf52_wdt_lowerhalf_s *)lower;
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uint32_t ticks;
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uint32_t elapsed;
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wdinfo("Entry\n");
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DEBUGASSERT(priv);
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/* Return the status bit */
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status->flags = WDFLAGS_RESET;
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if (priv->started)
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{
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status->flags |= WDFLAGS_ACTIVE;
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}
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/* Return the actual timeout in milliseconds */
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status->timeout = priv->timeout;
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/* Get the elapsed time since the last ping */
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ticks = clock_systime_ticks() - priv->lastreset;
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elapsed = (int32_t)TICK2MSEC(ticks);
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if (elapsed > priv->timeout)
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{
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elapsed = priv->timeout;
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}
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/* Return the approximate time until the watchdog timer expiration */
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status->timeleft = priv->timeout - elapsed;
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wdinfo("Status :\n");
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wdinfo(" flags : %08x\n", status->flags);
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wdinfo(" timeout : %d\n", status->timeout);
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wdinfo(" timeleft : %d\n", status->timeleft);
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return OK;
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}
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/****************************************************************************
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* Name: nrf52_settimeout
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*
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* Description:
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* Set a new timeout value (and reset the watchdog timer)
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*
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* Input Parameters:
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* lower - A pointer the publicly visible representation of
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* the "lower-half" driver state structure.
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* timeout - The new timeout value in milliseconds.
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*
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* Returned Values:
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* Zero on success; a negated errno value on failure.
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*
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****************************************************************************/
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static int nrf52_settimeout(FAR struct watchdog_lowerhalf_s *lower,
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uint32_t timeout)
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{
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FAR struct nrf52_wdt_lowerhalf_s *priv =
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(FAR struct nrf52_wdt_lowerhalf_s *)lower;
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wdinfo("Entry: timeout=%d\n", timeout);
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DEBUGASSERT(priv);
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/* Can this timeout be represented? */
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if (timeout < 1 || timeout > WDT_MAXTIMEOUT)
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{
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wderr("ERROR: Cannot represent timeout=%d > %d\n",
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timeout, WDT_MAXTIMEOUT);
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return -ERANGE;
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}
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if (priv->started)
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{
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wdwarn("WARNING: Watchdog is already started\n");
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return -EBUSY;
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}
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nrf52_wdt_behaviour_set(priv->mode);
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priv->timeout = timeout;
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nrf52_wdt_reload_value_set(((uint64_t) timeout * 32768) / 1000);
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up_enable_irq(NRF52_IRQ_WDT);
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wdinfo(" mode=%d priority=%d\n", WDT_CONFIG_MODE,
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WDT_CONFIG_IRQ_PRIORITY);
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return OK;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nrf52_wdt_initialize
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*
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* Description:
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* Initialize the WDT watchdog time. The watchdog timer is initialized and
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* registers as 'devpath. The initial state of the watchdog time is
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* disabled.
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*
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* Input Parameters:
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* devpath - The full path to the watchdog. This should be of the form
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* /dev/watchdog0
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* mode_sleep - The behaviour of watchdog when CPU enter sleep mode
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* mode_halt - The behaviour of watchdog when CPU was HALT by
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* debugger
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*
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* Returned Values:
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* Zero (OK) is returned on success; a negated errno value is returned on
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* any failure.
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*
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****************************************************************************/
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int nrf52_wdt_initialize(FAR const char *devpath, int16_t mode_sleep,
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int16_t mode_halt)
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{
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FAR struct nrf52_wdt_lowerhalf_s *priv = &g_wdtdev;
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FAR void *handle;
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wdinfo("Entry: devpath=%s, mode_sleep=%d, mode_halt=%d\n", devpath,
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mode_sleep, mode_halt);
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/* Initialize the driver state structure. */
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priv->ops = &g_wdtops;
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priv->started = false;
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priv->mode = (mode_halt << WDT_CONFIG_HALT) |
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(mode_sleep << WDT_CONFIG_SLEEP);
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#if 0
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/* Request LSECLK firstly */
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nrf52_clock_init();
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/* Select the lower power external 32,768Hz (Low-Speed External, LSE)
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* oscillator as RTC Clock Source and enable the Clock.
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*/
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nrf52_clock_lsclk_start();
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#endif
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/* Register the watchdog driver as /dev/watchdog0 */
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handle = watchdog_register(devpath,
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(FAR struct watchdog_lowerhalf_s *)priv);
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return (handle != NULL) ? OK : -ENODEV;
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}
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#endif /* CONFIG_WATCHDOG && CONFIG_nrf52_IWDT */
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@ -41,62 +41,137 @@
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****************************************************************************/
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||||
#include <nuttx/config.h>
|
||||
|
||||
#ifdef CONFIG_WATCHDOG
|
||||
#include <stdbool.h>
|
||||
|
||||
/****************************************************************************
|
||||
* Public Types
|
||||
****************************************************************************/
|
||||
|
||||
enum wdt_behaviour_e
|
||||
{
|
||||
WDG_PAUSE = 0,
|
||||
WDG_RUN = 1
|
||||
};
|
||||
|
||||
/****************************************************************************
|
||||
* Public Function Prototypes
|
||||
****************************************************************************/
|
||||
|
||||
#undef EXTERN
|
||||
#if defined(__cplusplus)
|
||||
#define EXTERN extern "C"
|
||||
extern "C"
|
||||
{
|
||||
#else
|
||||
#define EXTERN extern
|
||||
#endif
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nrf52_wdt_initialize
|
||||
* Name: nrf52_wdt_int_enable
|
||||
*
|
||||
* Description:
|
||||
* Initialize the WDT watchdog time. The watchdog timer is initialized and
|
||||
* registers as 'devpath. The initial state of the watchdog time is
|
||||
* disabled.
|
||||
* Enable watchdog interrupt.
|
||||
*
|
||||
* Input Parameters:
|
||||
* devpath - The full path to the watchdog. This should be of the form
|
||||
* /dev/watchdog0
|
||||
* mode_sleep - The behaviour of watchdog when CPU enter sleep mode
|
||||
* mode_halt - The behaviour of watchdog when CPU was HALT by
|
||||
* debugger
|
||||
* Input Parameter:
|
||||
* int_mask - Interrupt mask
|
||||
*
|
||||
* Returned Values:
|
||||
* Zero (OK) is returned on success; a negated errno value is returned on
|
||||
* any failure.
|
||||
* None
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
#ifdef CONFIG_NRF52_WDT
|
||||
int nrf52_wdt_initialize(FAR const char *devpath, int16_t mode_sleep,
|
||||
int16_t mode_halt);
|
||||
#endif
|
||||
void nrf52_wdt_int_enable(uint32_t int_mask);
|
||||
|
||||
#undef EXTERN
|
||||
#if defined(__cplusplus)
|
||||
}
|
||||
#endif
|
||||
/****************************************************************************
|
||||
* Name: nrf52_wdt_task_trigger
|
||||
*
|
||||
* Description:
|
||||
* Starts the watchdog
|
||||
*
|
||||
* Input Parameter:
|
||||
* None
|
||||
*
|
||||
* Returned Values:
|
||||
* None
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
void nrf52_wdt_task_trigger(void);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nrf52_wdt_reload_register_enable
|
||||
*
|
||||
* Description:
|
||||
* Enable/disable a given reload register
|
||||
*
|
||||
* Input Parameter:
|
||||
* rr_register - Reload request register
|
||||
* enable - true to enable, false to disable
|
||||
*
|
||||
* Returned Values:
|
||||
* None
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
void nrf52_wdt_reload_register_enable(int rr_register, bool enable);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nrf52_wdt_reload_request_set
|
||||
*
|
||||
* Description:
|
||||
* Setting a specific reload request register
|
||||
*
|
||||
* Input Parameter:
|
||||
* rr_register - Reload request register to set
|
||||
*
|
||||
* Returned Values:
|
||||
* None
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
void nrf52_wdt_reload_request_set(int rr_register);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nrf52_wdt_behaviour_set
|
||||
*
|
||||
* Description:
|
||||
* Configure the watchdog behaviour when the CPU is sleeping or halted
|
||||
*
|
||||
* Input Parameter:
|
||||
* behavior - The behaviour to be configured
|
||||
*
|
||||
* Returned Values:
|
||||
* None
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
void nrf52_wdt_behaviour_set(int behaviour);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nrf52_wdt_reload_value_set
|
||||
*
|
||||
* Description:
|
||||
* Setup the watchdog reload value
|
||||
*
|
||||
* Input Parameter:
|
||||
* reload_value - Watchdog counter initial value
|
||||
*
|
||||
* Returned Values:
|
||||
* None
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
void nrf52_wdt_reload_value_set(uint32_t reload_value);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nrf52_wdt_reload_value_get
|
||||
*
|
||||
* Description:
|
||||
* Read the watchdog reload value
|
||||
*
|
||||
* Returned Values:
|
||||
* Watchdog counter initial value
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
uint32_t nrf52_wdt_reload_value_get(void);
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nrf52_wdt_running
|
||||
*
|
||||
* Description:
|
||||
* Check if watchdog is running
|
||||
*
|
||||
* Returned Values:
|
||||
* true if watchdog is running, false otherwise
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
bool nrf52_wdt_running(void);
|
||||
|
||||
#endif /* CONFIG_WATCHDOG */
|
||||
#endif /* __ARCH_ARM_SRC_NRF52_NRF52_WDT_H */
|
||||
|
||||
427
arch/arm/src/nrf52/nrf52_wdt_lowerhalf.c
Normal file
427
arch/arm/src/nrf52/nrf52_wdt_lowerhalf.c
Normal file
@ -0,0 +1,427 @@
|
||||
/****************************************************************************
|
||||
* arch/arm/src/nrf52/nrf52_wdt_lowerhalf.c
|
||||
*
|
||||
* Copyright (C) 2018 Zglue Inc. All rights reserved.
|
||||
* Author: Levin Li <zhiqiang@zglue.com>
|
||||
* Author: Alan Carvalho de Assis <acassis@gmail.com>
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. 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.
|
||||
* 3. Neither the name NuttX 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 IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Included Files
|
||||
****************************************************************************/
|
||||
|
||||
#include <nuttx/config.h>
|
||||
#include <nuttx/arch.h>
|
||||
|
||||
#include <stdint.h>
|
||||
#include <errno.h>
|
||||
#include <debug.h>
|
||||
|
||||
#include <nuttx/irq.h>
|
||||
#include <nuttx/clock.h>
|
||||
#include <nuttx/timers/watchdog.h>
|
||||
#include <arch/board/board.h>
|
||||
|
||||
#include "nrf52_wdt.h"
|
||||
#include "hardware/nrf52_wdt.h"
|
||||
#include "nrf52_wdt_lowerhalf.h"
|
||||
|
||||
/****************************************************************************
|
||||
* Pre-processor Definitions
|
||||
****************************************************************************/
|
||||
|
||||
/* Clocking *****************************************************************/
|
||||
|
||||
/* The watchdog is always running under 32.768KHz:
|
||||
*
|
||||
* Fmin = Flsi / 32768
|
||||
*
|
||||
* So the maximum delay (in milliseconds) is then:
|
||||
*
|
||||
* 1000 * WDT_MAX_VALUE / 32768
|
||||
*
|
||||
* For example, if Flsi = 30Khz (the nominal, uncalibrated value), then the
|
||||
* maximum delay is:
|
||||
*
|
||||
* Fmin = 0.03 ms
|
||||
* Fmax = 131702 Sec
|
||||
*/
|
||||
|
||||
#define WDT_FMIN (1)
|
||||
#define WDT_MAXTIMEOUT (1000 * (UINT32_MAX / 32768))
|
||||
|
||||
/* Configuration ************************************************************/
|
||||
|
||||
/* There are the options:
|
||||
*
|
||||
* WDT_CONFIG_MODE - WDT behavior in CPU SLEEP or HALT mode
|
||||
* <1=> Run in SLEEP, Pause in HALT
|
||||
* <8=> Pause in SLEEP, Run in HALT
|
||||
* <9=> Run in SLEEP and HALT
|
||||
* <0=> Pause in SLEEP and HALT
|
||||
*/
|
||||
|
||||
#define NRF_WDT_BEHAVIOUR_PAUSE_SLEEP_HALT 0
|
||||
#define WDT_CONFIG_MODE NRF_WDT_BEHAVIOUR_PAUSE_SLEEP_HALT
|
||||
|
||||
#define WDT_CONFIG_IRQ_PRIORITY 7
|
||||
|
||||
/****************************************************************************
|
||||
* Private Types
|
||||
****************************************************************************/
|
||||
|
||||
/* This structure provides the private representation of the "lower-half"
|
||||
* driver state structure. This structure must be cast-compatible with the
|
||||
* well-known watchdog_lowerhalf_s structure.
|
||||
*/
|
||||
|
||||
struct nrf52_wdt_lowerhalf_s
|
||||
{
|
||||
FAR const struct watchdog_ops_s *ops; /* Lower half operations */
|
||||
uint32_t lastreset; /* The last reset time */
|
||||
bool started; /* true: The watchdog timer has been started */
|
||||
uint16_t mode; /* watchdog mode under sleep and halt of CPU */
|
||||
};
|
||||
|
||||
/****************************************************************************
|
||||
* Private Function Prototypes
|
||||
****************************************************************************/
|
||||
|
||||
/* "Lower half" driver methods **********************************************/
|
||||
|
||||
static int nrf52_start(FAR struct watchdog_lowerhalf_s *lower);
|
||||
static int nrf52_stop(FAR struct watchdog_lowerhalf_s *lower);
|
||||
static int nrf52_keepalive(FAR struct watchdog_lowerhalf_s *lower);
|
||||
static int nrf52_getstatus(FAR struct watchdog_lowerhalf_s *lower,
|
||||
FAR struct watchdog_status_s *status);
|
||||
static int nrf52_settimeout(FAR struct watchdog_lowerhalf_s *lower,
|
||||
uint32_t timeout);
|
||||
|
||||
/****************************************************************************
|
||||
* Private Data
|
||||
****************************************************************************/
|
||||
|
||||
/* "Lower half" driver methods */
|
||||
|
||||
static const struct watchdog_ops_s g_wdtops =
|
||||
{
|
||||
.start = nrf52_start,
|
||||
.stop = nrf52_stop,
|
||||
.keepalive = nrf52_keepalive,
|
||||
.getstatus = nrf52_getstatus,
|
||||
.settimeout = nrf52_settimeout,
|
||||
.capture = NULL,
|
||||
.ioctl = NULL,
|
||||
};
|
||||
|
||||
/* "Lower half" driver state */
|
||||
|
||||
static struct nrf52_wdt_lowerhalf_s g_wdtdev =
|
||||
{
|
||||
.lastreset = 0,
|
||||
.started = false,
|
||||
};
|
||||
|
||||
/****************************************************************************
|
||||
* Public Data
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Private Functions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nrf52_start
|
||||
*
|
||||
* Description:
|
||||
* Start the watchdog timer, resetting the time to the current timeout,
|
||||
*
|
||||
* Input Parameters:
|
||||
* lower - A pointer the publicly visible representation of the
|
||||
* "lower-half" driver state structure.
|
||||
*
|
||||
* Returned Values:
|
||||
* Zero on success; a negated errno value on failure.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static int nrf52_start(FAR struct watchdog_lowerhalf_s *lower)
|
||||
{
|
||||
FAR struct nrf52_wdt_lowerhalf_s *priv =
|
||||
(FAR struct nrf52_wdt_lowerhalf_s *)lower;
|
||||
irqstate_t flags;
|
||||
|
||||
wdinfo("Entry: started=%d\n");
|
||||
DEBUGASSERT(priv);
|
||||
|
||||
/* Have we already been started? */
|
||||
|
||||
if (!priv->started)
|
||||
{
|
||||
flags = enter_critical_section();
|
||||
priv->lastreset = clock_systime_ticks();
|
||||
priv->started = true;
|
||||
nrf52_wdt_int_enable(WDT_INT_TIMEOUT);
|
||||
nrf52_wdt_task_trigger();
|
||||
leave_critical_section(flags);
|
||||
}
|
||||
|
||||
return OK;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nrf52_stop
|
||||
*
|
||||
* Description:
|
||||
* Stop the watchdog timer
|
||||
*
|
||||
* Input Parameters:
|
||||
* lower - A pointer the publicly visible representation of the
|
||||
* "lower-half" driver state structure.
|
||||
*
|
||||
* Returned Values:
|
||||
* Zero on success; a negated errno value on failure.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static int nrf52_stop(FAR struct watchdog_lowerhalf_s *lower)
|
||||
{
|
||||
/* There is no way to disable the WDT timer once it has been started */
|
||||
|
||||
wdinfo("Entry\n");
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nrf52_keepalive
|
||||
*
|
||||
* Description:
|
||||
* Reset the watchdog timer to the current timeout value, prevent any
|
||||
* imminent watchdog timeouts. This is sometimes referred as "pinging"
|
||||
* the watchdog timer or "petting the dog".
|
||||
*
|
||||
* Input Parameters:
|
||||
* lower - A pointer the publicly visible representation of the
|
||||
* "lower-half" driver state structure.
|
||||
*
|
||||
* Returned Values:
|
||||
* Zero on success; a negated errno value on failure.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static int nrf52_keepalive(FAR struct watchdog_lowerhalf_s *lower)
|
||||
{
|
||||
FAR struct nrf52_wdt_lowerhalf_s *priv =
|
||||
(FAR struct nrf52_wdt_lowerhalf_s *)lower;
|
||||
irqstate_t flags;
|
||||
|
||||
wdinfo("Entry\n");
|
||||
|
||||
/* Reload the WDT timer */
|
||||
|
||||
flags = enter_critical_section();
|
||||
|
||||
priv->lastreset = clock_systime_ticks();
|
||||
nrf52_wdt_reload_request_set(0);
|
||||
|
||||
leave_critical_section(flags);
|
||||
|
||||
return OK;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nrf52_getstatus
|
||||
*
|
||||
* Description:
|
||||
* Get the current watchdog timer status
|
||||
*
|
||||
* Input Parameters:
|
||||
* lower - A pointer the publicly visible representation of
|
||||
* the "lower-half" driver state structure.
|
||||
* status - The location to return the watchdog status information.
|
||||
*
|
||||
* Returned Values:
|
||||
* Zero on success; a negated errno value on failure.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static int nrf52_getstatus(FAR struct watchdog_lowerhalf_s *lower,
|
||||
FAR struct watchdog_status_s *status)
|
||||
{
|
||||
FAR struct nrf52_wdt_lowerhalf_s *priv =
|
||||
(FAR struct nrf52_wdt_lowerhalf_s *)lower;
|
||||
uint32_t ticks;
|
||||
uint32_t elapsed;
|
||||
|
||||
wdinfo("Entry\n");
|
||||
DEBUGASSERT(priv);
|
||||
|
||||
/* Return the status bit */
|
||||
|
||||
status->flags = WDFLAGS_RESET;
|
||||
if (priv->started)
|
||||
{
|
||||
status->flags |= WDFLAGS_ACTIVE;
|
||||
}
|
||||
|
||||
/* Return the actual timeout in milliseconds */
|
||||
|
||||
status->timeout = (nrf52_wdt_reload_value_get() / 32768) * 1000;
|
||||
|
||||
/* Get the elapsed time since the last ping */
|
||||
|
||||
ticks = clock_systime_ticks() - priv->lastreset;
|
||||
elapsed = (int32_t)TICK2MSEC(ticks);
|
||||
|
||||
if (elapsed > status->timeout)
|
||||
{
|
||||
elapsed = status->timeout;
|
||||
}
|
||||
|
||||
/* Return the approximate time until the watchdog timer expiration */
|
||||
|
||||
status->timeleft = status->timeout - elapsed;
|
||||
|
||||
wdinfo("Status :\n");
|
||||
wdinfo(" flags : %08x\n", status->flags);
|
||||
wdinfo(" timeout : %d\n", status->timeout);
|
||||
wdinfo(" timeleft : %d\n", status->timeleft);
|
||||
return OK;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nrf52_settimeout
|
||||
*
|
||||
* Description:
|
||||
* Set a new timeout value (and reset the watchdog timer)
|
||||
*
|
||||
* Input Parameters:
|
||||
* lower - A pointer the publicly visible representation of
|
||||
* the "lower-half" driver state structure.
|
||||
* timeout - The new timeout value in milliseconds.
|
||||
*
|
||||
* Returned Values:
|
||||
* Zero on success; a negated errno value on failure.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
static int nrf52_settimeout(FAR struct watchdog_lowerhalf_s *lower,
|
||||
uint32_t timeout)
|
||||
{
|
||||
FAR struct nrf52_wdt_lowerhalf_s *priv =
|
||||
(FAR struct nrf52_wdt_lowerhalf_s *)lower;
|
||||
|
||||
wdinfo("Entry: timeout=%d\n", timeout);
|
||||
DEBUGASSERT(priv);
|
||||
|
||||
/* Can this timeout be represented? */
|
||||
|
||||
if (timeout < 1 || timeout > WDT_MAXTIMEOUT)
|
||||
{
|
||||
wderr("ERROR: Cannot represent timeout=%d > %d\n",
|
||||
timeout, WDT_MAXTIMEOUT);
|
||||
return -ERANGE;
|
||||
}
|
||||
|
||||
if (priv->started)
|
||||
{
|
||||
wdwarn("WARNING: Watchdog is already started\n");
|
||||
return -EBUSY;
|
||||
}
|
||||
|
||||
nrf52_wdt_behaviour_set(priv->mode);
|
||||
|
||||
nrf52_wdt_reload_value_set(((uint64_t) timeout * 32768) / 1000);
|
||||
|
||||
up_enable_irq(NRF52_IRQ_WDT);
|
||||
|
||||
wdinfo(" mode=%d priority=%d\n", WDT_CONFIG_MODE,
|
||||
WDT_CONFIG_IRQ_PRIORITY);
|
||||
|
||||
return OK;
|
||||
}
|
||||
|
||||
/****************************************************************************
|
||||
* Public Functions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nrf52_wdt_initialize
|
||||
*
|
||||
* Description:
|
||||
* Initialize the WDT watchdog time. The watchdog timer is initialized and
|
||||
* registers as 'devpath. The initial state of the watchdog time is
|
||||
* disabled.
|
||||
*
|
||||
* Input Parameters:
|
||||
* devpath - The full path to the watchdog. This should be of the form
|
||||
* /dev/watchdog0
|
||||
* mode_sleep - The behaviour of watchdog when CPU enter sleep mode
|
||||
* mode_halt - The behaviour of watchdog when CPU was HALT by
|
||||
* debugger
|
||||
*
|
||||
* Returned Values:
|
||||
* Zero (OK) is returned on success; a negated errno value is returned on
|
||||
* any failure.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
int nrf52_wdt_initialize(FAR const char *devpath, int16_t mode_sleep,
|
||||
int16_t mode_halt)
|
||||
{
|
||||
FAR struct nrf52_wdt_lowerhalf_s *priv = &g_wdtdev;
|
||||
FAR void *handle;
|
||||
|
||||
wdinfo("Entry: devpath=%s, mode_sleep=%d, mode_halt=%d\n", devpath,
|
||||
mode_sleep, mode_halt);
|
||||
|
||||
/* Initialize the driver state structure. */
|
||||
|
||||
priv->ops = &g_wdtops;
|
||||
priv->started = nrf52_wdt_running();
|
||||
|
||||
if (priv->started)
|
||||
{
|
||||
wdwarn("Watchdog is already running, "
|
||||
"configuration cannot be changed\n");
|
||||
}
|
||||
|
||||
/* This will only take effect if watchdog is not yet running */
|
||||
|
||||
priv->mode = (mode_halt << WDT_CONFIG_HALT) |
|
||||
(mode_sleep << WDT_CONFIG_SLEEP);
|
||||
|
||||
/* Register the watchdog driver as /dev/watchdog0 */
|
||||
|
||||
handle = watchdog_register(devpath,
|
||||
(FAR struct watchdog_lowerhalf_s *)priv);
|
||||
return (handle != NULL) ? OK : -ENODEV;
|
||||
}
|
||||
104
arch/arm/src/nrf52/nrf52_wdt_lowerhalf.h
Normal file
104
arch/arm/src/nrf52/nrf52_wdt_lowerhalf.h
Normal file
@ -0,0 +1,104 @@
|
||||
/****************************************************************************
|
||||
* arch/arm/src/nrf52/nrf52_wdt_lowerhalf.c
|
||||
*
|
||||
* Copyright (C) 2018 Zglue Inc. All rights reserved.
|
||||
* Author: Levin Li <zhiqiang@zglue.com>
|
||||
* Author: Alan Carvalho de Assis <acassis@gmail.com>
|
||||
*
|
||||
* Redistribution and use in source and binary forms, with or without
|
||||
* modification, are permitted provided that the following conditions
|
||||
* are met:
|
||||
*
|
||||
* 1. Redistributions of source code must retain the above copyright
|
||||
* notice, this list of conditions and the following disclaimer.
|
||||
* 2. 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.
|
||||
* 3. Neither the name NuttX 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 IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
||||
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
||||
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
||||
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
||||
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
||||
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||||
* POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
#ifndef __ARCH_ARM_NRF52_WDT_LOWERHALF_H
|
||||
#define __ARCH_ARM_NRF52_WDT_LOWERHALF_H
|
||||
|
||||
/****************************************************************************
|
||||
* Included Files
|
||||
****************************************************************************/
|
||||
|
||||
#include <nuttx/config.h>
|
||||
|
||||
/****************************************************************************
|
||||
* Pre-processor Definitions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Public Types
|
||||
****************************************************************************/
|
||||
|
||||
enum wdt_behaviour_e
|
||||
{
|
||||
WDG_PAUSE = 0,
|
||||
WDG_RUN = 1
|
||||
};
|
||||
|
||||
/****************************************************************************
|
||||
* Public Data
|
||||
****************************************************************************/
|
||||
|
||||
#ifdef __cplusplus
|
||||
#define EXTERN extern "C"
|
||||
extern "C"
|
||||
{
|
||||
#else
|
||||
#define EXTERN extern
|
||||
#endif
|
||||
|
||||
/****************************************************************************
|
||||
* Inline Functions
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Public Function Prototypes
|
||||
****************************************************************************/
|
||||
|
||||
/****************************************************************************
|
||||
* Name: nrf52_wdt_initialize
|
||||
*
|
||||
* Description:
|
||||
* Initialize the WDT watchdog time. The watchdog timer is initialized and
|
||||
* registers as 'devpath. The initial state of the watchdog time is
|
||||
* disabled.
|
||||
*
|
||||
* Input Parameters:
|
||||
* devpath - The full path to the watchdog. This should be of the form
|
||||
* /dev/watchdog0
|
||||
* mode_sleep - The behaviour of watchdog when CPU enter sleep mode
|
||||
* mode_halt - The behaviour of watchdog when CPU was HALT by
|
||||
* debugger
|
||||
*
|
||||
* Returned Values:
|
||||
* Zero (OK) is returned on success; a negated errno value is returned on
|
||||
* any failure.
|
||||
*
|
||||
****************************************************************************/
|
||||
|
||||
int nrf52_wdt_initialize(FAR const char *devpath, int16_t mode_sleep,
|
||||
int16_t mode_halt);
|
||||
|
||||
#endif /* __ARCH_ARM_NRF52_WDT_LOWERHALF_H */
|
||||
@ -43,7 +43,7 @@
|
||||
#include <syslog.h>
|
||||
|
||||
#ifdef CONFIG_NRF52_WDT
|
||||
# include "nrf52_wdt.h"
|
||||
# include "nrf52_wdt_lowerhalf.h"
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_USERLED
|
||||
|
||||
@ -43,7 +43,7 @@
|
||||
#include <syslog.h>
|
||||
|
||||
#ifdef CONFIG_NRF52_WDT
|
||||
# include "nrf52_wdt.h"
|
||||
# include "nrf52_wdt_lowerhalf.h"
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_USERLED
|
||||
|
||||
@ -28,7 +28,7 @@
|
||||
#include <syslog.h>
|
||||
|
||||
#ifdef CONFIG_NRF52_WDT
|
||||
# include "nrf52_wdt.h"
|
||||
# include "nrf52_wdt_lowerhalf.h"
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_USERLED
|
||||
|
||||
@ -28,7 +28,7 @@
|
||||
#include <syslog.h>
|
||||
|
||||
#ifdef CONFIG_NRF52_WDT
|
||||
# include "nrf52_wdt.h"
|
||||
# include "nrf52_wdt_lowerhalf.h"
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_USERLED
|
||||
|
||||
Loading…
Reference in New Issue
Block a user