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Diffstat (limited to 'nuttx/arch/arm/src/stm32/stm32_wwdg.c')
-rw-r--r--nuttx/arch/arm/src/stm32/stm32_wwdg.c807
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diff --git a/nuttx/arch/arm/src/stm32/stm32_wwdg.c b/nuttx/arch/arm/src/stm32/stm32_wwdg.c
deleted file mode 100644
index 4506fa4e0..000000000
--- a/nuttx/arch/arm/src/stm32/stm32_wwdg.c
+++ /dev/null
@@ -1,807 +0,0 @@
-/****************************************************************************
- * arch/arm/src/stm32/stm32_wwdg.c
- *
- * Copyright (C) 2012 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * 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/watchdog.h>
-#include <arch/board/board.h>
-
-#include "up_arch.h"
-#include "chip/stm32_dbgmcu.h"
-#include "stm32_wdg.h"
-
-#if defined(CONFIG_WATCHDOG) && defined(CONFIG_STM32_WWDG)
-
-/****************************************************************************
- * Pre-Processor Definitions
- ****************************************************************************/
-/* Clocking *****************************************************************/
-/* The minimum frequency of the WWDG clock is:
- *
- * Fmin = PCLK1 / 4096 / 8
- *
- * So the maximum delay (in milliseconds) is then:
- *
- * 1000 * (WWDG_CR_T_MAX+1) / Fmin
- *
- * For example, if PCLK1 = 42MHz, then the maximum delay is:
- *
- * Fmin = 1281.74
- * 1000 * 64 / Fmin = 49.93 msec
- */
-
-#define WWDG_FMIN (STM32_PCLK1_FREQUENCY / 4096 / 8)
-#define WWDG_MAXTIMEOUT (1000 * (WWDG_CR_T_MAX+1) / WWDG_FMIN)
-
-/* Configuration ************************************************************/
-
-#ifndef CONFIG_STM32_WWDG_DEFTIMOUT
-# define CONFIG_STM32_WWDG_DEFTIMOUT WWDG_MAXTIMEOUT
-#endif
-
-/* Debug ********************************************************************/
-/* Non-standard debug that may be enabled just for testing the watchdog
- * driver. NOTE: that only lldbg types are used so that the output is
- * immediately available.
- */
-
-#ifdef CONFIG_DEBUG_WATCHDOG
-# define wddbg lldbg
-# define wdvdbg llvdbg
-#else
-# define wddbg(x...)
-# define wdvdbg(x...)
-#endif
-
-/****************************************************************************
- * 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 stm32_lowerhalf_s
-{
- FAR const struct watchdog_ops_s *ops; /* Lower half operations */
- xcpt_t handler; /* Current EWI interrupt handler */
- uint32_t timeout; /* The actual timeout value */
- uint32_t fwwdg; /* WWDG clock frequency */
- bool started; /* The timer has been started */
- uint8_t reload; /* The 7-bit reload field reset value */
- uint8_t window; /* The 7-bit window (W) field value */
-};
-
-/****************************************************************************
- * Private Function Prototypes
- ****************************************************************************/
-/* Register operations ******************************************************/
-
-#if defined(CONFIG_STM32_WWDG_REGDEBUG) && defined(CONFIG_DEBUG)
-static uint16_t stm32_getreg(uint32_t addr);
-static void stm32_putreg(uint16_t val, uint32_t addr);
-#else
-# define stm32_getreg(addr) getreg32(addr)
-# define stm32_putreg(val,addr) putreg32(val,addr)
-#endif
-static void stm32_setwindow(FAR struct stm32_lowerhalf_s *priv,
- uint8_t window);
-
-/* Interrupt hanlding *******************************************************/
-
-static int stm32_interrupt(int irq, FAR void *context);
-
-/* "Lower half" driver methods **********************************************/
-
-static int stm32_start(FAR struct watchdog_lowerhalf_s *lower);
-static int stm32_stop(FAR struct watchdog_lowerhalf_s *lower);
-static int stm32_keepalive(FAR struct watchdog_lowerhalf_s *lower);
-static int stm32_getstatus(FAR struct watchdog_lowerhalf_s *lower,
- FAR struct watchdog_status_s *status);
-static int stm32_settimeout(FAR struct watchdog_lowerhalf_s *lower,
- uint32_t timeout);
-static xcpt_t stm32_capture(FAR struct watchdog_lowerhalf_s *lower,
- xcpt_t handler);
-static int stm32_ioctl(FAR struct watchdog_lowerhalf_s *lower, int cmd,
- unsigned long arg);
-
-/****************************************************************************
- * Private Data
- ****************************************************************************/
-/* "Lower half" driver methods */
-
-static const struct watchdog_ops_s g_wdgops =
-{
- .start = stm32_start,
- .stop = stm32_stop,
- .keepalive = stm32_keepalive,
- .getstatus = stm32_getstatus,
- .settimeout = stm32_settimeout,
- .capture = stm32_capture,
- .ioctl = stm32_ioctl,
-};
-
-/* "Lower half" driver state */
-
-static struct stm32_lowerhalf_s g_wdgdev;
-
-/****************************************************************************
- * Private Functions
- ****************************************************************************/
-
-/****************************************************************************
- * Name: stm32_getreg
- *
- * Description:
- * Get the contents of an STM32 register
- *
- ****************************************************************************/
-
-#if defined(CONFIG_STM32_WWDG_REGDEBUG) && defined(CONFIG_DEBUG)
-static uint16_t stm32_getreg(uint32_t addr)
-{
- static uint32_t prevaddr = 0;
- static uint32_t count = 0;
- static uint16_t preval = 0;
-
- /* Read the value from the register */
-
- uint16_t val = getreg16(addr);
-
- /* Is this the same value that we read from the same registe last time? Are
- * we polling the register? If so, suppress some of the output.
- */
-
- if (addr == prevaddr && val == preval)
- {
- if (count == 0xffffffff || ++count > 3)
- {
- if (count == 4)
- {
- lldbg("...\n");
- }
- return val;
- }
- }
-
- /* No this is a new address or value */
-
- else
- {
- /* Did we print "..." for the previous value? */
-
- if (count > 3)
- {
- /* Yes.. then show how many times the value repeated */
-
- lldbg("[repeats %d more times]\n", count-3);
- }
-
- /* Save the new address, value, and count */
-
- prevaddr = addr;
- preval = val;
- count = 1;
- }
-
- /* Show the register value read */
-
- lldbg("%08x->%04x\n", addr, val);
- return val;
-}
-#endif
-
-/****************************************************************************
- * Name: stm32_putreg
- *
- * Description:
- * Set the contents of an STM32 register to a value
- *
- ****************************************************************************/
-
-#if defined(CONFIG_STM32_WWDG_REGDEBUG) && defined(CONFIG_DEBUG)
-static void stm32_putreg(uint16_t val, uint32_t addr)
-{
- /* Show the register value being written */
-
- lldbg("%08x<-%04x\n", addr, val);
-
- /* Write the value */
-
- putreg16(val, addr);
-}
-#endif
-
-/****************************************************************************
- * Name: stm32_setwindow
- *
- * Description:
- * Set the CFR window value. The window value is compared to the down-
- * counter when the counter is updated. The WWDG counter should be updated
- * only when the counter is below this window value (and greater than 64)
- * otherwise a reset will be generated
- *
- ****************************************************************************/
-
-static void stm32_setwindow(FAR struct stm32_lowerhalf_s *priv, uint8_t window)
-{
- uint16_t regval;
-
- /* Set W[6:0] bits according to selected window value */
-
- regval = stm32_getreg(STM32_WWDG_CFR);
- regval &= ~WWDG_CFR_W_MASK;
- regval |= window << WWDG_CFR_W_SHIFT;
- stm32_putreg(regval, STM32_WWDG_CFR);
-
- /* Remember the window setting */
-
- priv->window = window;
-}
-
-/****************************************************************************
- * Name: stm32_interrupt
- *
- * Description:
- * WWDG early warning interrupt
- *
- * Input Parameters:
- * Usual interrupt handler arguments.
- *
- * Returned Values:
- * Always returns OK.
- *
- ****************************************************************************/
-
-static int stm32_interrupt(int irq, FAR void *context)
-{
- FAR struct stm32_lowerhalf_s *priv = &g_wdgdev;
- uint16_t regval;
-
- /* Check if the EWI interrupt is really pending */
-
- regval = stm32_getreg(STM32_WWDG_SR);
- if ((regval & WWDG_SR_EWIF) != 0)
- {
- /* Is there a registered handler? */
-
- if (priv->handler)
- {
- /* Yes... NOTE: This interrupt service routine (ISR) must reload
- * the WWDG counter to prevent the reset. Otherwise, we will reset
- * upon return.
- */
-
- priv->handler(irq, context);
- }
-
- /* The EWI interrupt is cleared by writing '0' to the EWIF bit in the
- * WWDG_SR register.
- */
-
- regval &= ~WWDG_SR_EWIF;
- stm32_putreg(regval, STM32_WWDG_SR);
- }
-
- return OK;
-}
-
-/****************************************************************************
- * Name: stm32_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 stm32_start(FAR struct watchdog_lowerhalf_s *lower)
-{
- FAR struct stm32_lowerhalf_s *priv = (FAR struct stm32_lowerhalf_s *)lower;
-
- wdvdbg("Entry\n");
- DEBUGASSERT(priv);
-
- /* The watchdog is always disabled after a reset. It is enabled by setting
- * the WDGA bit in the WWDG_CR register, then it cannot be disabled again
- * except by a reset.
- */
-
- stm32_putreg(WWDG_CR_WDGA | WWDG_CR_T_RESET | priv->reload, STM32_WWDG_CR);
- priv->started = true;
- return OK;
-}
-
-/****************************************************************************
- * Name: stm32_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 stm32_stop(FAR struct watchdog_lowerhalf_s *lower)
-{
- /* The watchdog is always disabled after a reset. It is enabled by setting
- * the WDGA bit in the WWDG_CR register, then it cannot be disabled again
- * except by a reset.
- */
-
- wdvdbg("Entry\n");
- return -ENOSYS;
-}
-
-/****************************************************************************
- * Name: stm32_keepalive
- *
- * Description:
- * Reset the watchdog timer to the current timeout value, prevent any
- * imminent watchdog timeouts. This is sometimes referred as "pinging"
- * the atchdog timer or "petting the dog".
- *
- * The application program must write in the WWDG_CR register at regular
- * intervals during normal operation to prevent an MCU reset. This operation
- * must occur only when the counter value is lower than the window register
- * value. The value to be stored in the WWDG_CR register must be between
- * 0xff and 0xC0:
- *
- * 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 stm32_keepalive(FAR struct watchdog_lowerhalf_s *lower)
-{
- FAR struct stm32_lowerhalf_s *priv = (FAR struct stm32_lowerhalf_s *)lower;
-
- wdvdbg("Entry\n");
- DEBUGASSERT(priv);
-
- /* Write to T[6:0] bits to configure the counter value, no need to do
- * a read-modify-write; writing a 0 to WDGA bit does nothing.
- */
-
- stm32_putreg((WWDG_CR_T_RESET | priv->reload), STM32_WWDG_CR);
- return OK;
-}
-
-/****************************************************************************
- * Name: stm32_getstatus
- *
- * Description:
- * Get the current watchdog timer status
- *
- * Input Parameters:
- * lower - A pointer the publicly visible representation of the "lower-half"
- * driver state structure.
- * stawtus - The location to return the watchdog status information.
- *
- * Returned Values:
- * Zero on success; a negated errno value on failure.
- *
- ****************************************************************************/
-
-static int stm32_getstatus(FAR struct watchdog_lowerhalf_s *lower,
- FAR struct watchdog_status_s *status)
-{
- FAR struct stm32_lowerhalf_s *priv = (FAR struct stm32_lowerhalf_s *)lower;
- uint32_t elapsed;
- uint16_t reload;
-
- wdvdbg("Entry\n");
- DEBUGASSERT(priv);
-
- /* Return the status bit */
-
- status->flags = WDFLAGS_RESET;
- if (priv->started)
- {
- status->flags |= WDFLAGS_ACTIVE;
- }
-
- if (priv->handler)
- {
- status->flags |= WDFLAGS_CAPTURE;
- }
-
- /* Return the actual timeout is milliseconds */
-
- status->timeout = priv->timeout;
-
- /* Get the time remaining until the watchdog expires (in milliseconds) */
-
- reload = (stm32_getreg(STM32_WWDG_CR) >> WWDG_CR_T_SHIFT) & 0x7f;
- elapsed = priv->reload - reload;
- status->timeleft = (priv->timeout * elapsed) / (priv->reload + 1);
-
- wdvdbg("Status :\n");
- wdvdbg(" flags : %08x\n", status->flags);
- wdvdbg(" timeout : %d\n", status->timeout);
- wdvdbg(" timeleft : %d\n", status->flags);
- return OK;
-}
-
-/****************************************************************************
- * Name: stm32_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 millisecnds.
- *
- * Returned Values:
- * Zero on success; a negated errno value on failure.
- *
- ****************************************************************************/
-
-static int stm32_settimeout(FAR struct watchdog_lowerhalf_s *lower,
- uint32_t timeout)
-{
- FAR struct stm32_lowerhalf_s *priv = (FAR struct stm32_lowerhalf_s *)lower;
- uint32_t fwwdg;
- uint32_t reload;
- uint16_t regval;
- int wdgtb;
-
- DEBUGASSERT(priv);
- wdvdbg("Entry: timeout=%d\n", timeout);
-
- /* Can this timeout be represented? */
-
- if (timeout < 1 || timeout > WWDG_MAXTIMEOUT)
- {
- wddbg("Cannot represent timeout=%d > %d\n",
- timeout, WWDG_MAXTIMEOUT);
- return -ERANGE;
- }
-
- /* Determine prescaler value.
- *
- * Fwwdg = PCLK1/4096/prescaler.
- *
- * Where
- * Fwwwdg is the frequency of the WWDG clock
- * wdgtb is one of {1, 2, 4, or 8}
- */
-
- /* Select the smallest prescaler that will result in a reload field value that is
- * less than the maximum.
- */
-
- for (wdgtb = 0; ; wdgtb++)
- {
- /* WDGTB = 0 -> Divider = 1 = 1 << 0
- * WDGTB = 1 -> Divider = 2 = 1 << 1
- * WDGTB = 2 -> Divider = 4 = 1 << 2
- * WDGTB = 3 -> Divider = 8 = 1 << 3
- */
-
- /* Get the WWDG counter frequency in Hz. */
-
- fwwdg = (STM32_PCLK1_FREQUENCY/4096) >> wdgtb;
-
- /* The formula to calculate the timeout value is given by:
- *
- * timeout = 1000 * (reload + 1) / Fwwdg, OR
- * reload = timeout * Fwwdg / 1000 - 1
- *
- * Where
- * timeout is the desired timout in milliseconds
- * reload is the contents of T{5:0]
- * Fwwdg is the frequency of the WWDG clock
- */
-
- reload = timeout * fwwdg / 1000 - 1;
-
- /* If this reload valid is less than the maximum or we are not ready
- * at the prescaler value, then break out of the loop to use these
- * settings.
- */
-
-#if 0
- wdvdbg("wdgtb=%d fwwdg=%d reload=%d timout=%d\n",
- wdgtb, fwwdg, reload, 1000 * (reload + 1) / fwwdg);
-#endif
- if (reload <= WWDG_CR_T_MAX || wdgtb == 3)
- {
- /* Note that we explicity break out of the loop rather than using
- * the 'for' loop termination logic because we do not want the
- * value of wdgtb to be incremented.
- */
-
- break;
- }
- }
-
- /* Make sure that the final reload value is within range */
-
- if (reload > WWDG_CR_T_MAX)
- {
- reload = WWDG_CR_T_MAX;
- }
-
- /* Calculate and save the actual timeout value in milliseconds:
- *
- * timeout = 1000 * (reload + 1) / Fwwdg
- */
-
- priv->timeout = 1000 * (reload + 1) / fwwdg;
-
- /* Remember the selected values */
-
- priv->fwwdg = fwwdg;
- priv->reload = reload;
-
- wdvdbg("wdgtb=%d fwwdg=%d reload=%d timout=%d\n",
- wdgtb, fwwdg, reload, priv->timeout);
-
- /* Set WDGTB[1:0] bits according to calculated value */
-
- regval = stm32_getreg(STM32_WWDG_CFR);
- regval &= ~WWDG_CFR_WDGTB_MASK;
- regval |= (uint16_t)wdgtb << WWDG_CFR_WDGTB_SHIFT;
- stm32_putreg(regval, STM32_WWDG_CFR);
-
- /* Reset the 7-bit window value to the maximum value.. essentially disabling
- * the lower limit of the watchdog reset time.
- */
-
- stm32_setwindow(priv, 0x7f);
- return OK;
-}
-
-/****************************************************************************
- * Name: stm32_capture
- *
- * Description:
- * Don't reset on watchdog timer timeout; instead, call this user provider
- * timeout handler. NOTE: Providing handler==NULL will restore the reset
- * behavior.
- *
- * Input Parameters:
- * lower - A pointer the publicly visible representation of the "lower-half"
- * driver state structure.
- * newhandler - The new watchdog expiration function pointer. If this
- * function pointer is NULL, then the the reset-on-expiration
- * behavior is restored,
- *
- * Returned Values:
- * The previous watchdog expiration function pointer or NULL is there was
- * no previous function pointer, i.e., if the previous behavior was
- * reset-on-expiration (NULL is also returned if an error occurs).
- *
- ****************************************************************************/
-
-static xcpt_t stm32_capture(FAR struct watchdog_lowerhalf_s *lower,
- xcpt_t handler)
-{
- FAR struct stm32_lowerhalf_s *priv = (FAR struct stm32_lowerhalf_s *)lower;
- irqstate_t flags;
- xcpt_t oldhandler;
- uint16_t regval;
-
- DEBUGASSERT(priv);
- wdvdbg("Entry: handler=%p\n", handler);
-
- /* Get the old handler return value */
-
- flags = irqsave();
- oldhandler = priv->handler;
-
- /* Save the new handler */
-
- priv->handler = handler;
-
- /* Are we attaching or detaching the handler? */
-
- regval = stm32_getreg(STM32_WWDG_CFR);
- if (handler)
- {
- /* Attaching... Enable the EWI interrupt */
-
- regval |= WWDG_CFR_EWI;
- stm32_putreg(regval, STM32_WWDG_CFR);
-
- up_enable_irq(STM32_IRQ_WWDG);
- }
- else
- {
- /* Detaching... Disable the EWI interrupt */
-
- regval &= ~WWDG_CFR_EWI;
- stm32_putreg(regval, STM32_WWDG_CFR);
-
- up_disable_irq(STM32_IRQ_WWDG);
- }
-
- irqrestore(flags);
- return oldhandler;
-}
-
-/****************************************************************************
- * Name: stm32_ioctl
- *
- * Description:
- * Any ioctl commands that are not recognized by the "upper-half" driver
- * are forwarded to the lower half driver through this method.
- *
- * Input Parameters:
- * lower - A pointer the publicly visible representation of the "lower-half"
- * driver state structure.
- * cmd - The ioctol command value
- * arg - The optional argument that accompanies the 'cmd'. The
- * interpretation of this argument depends on the particular
- * command.
- *
- * Returned Values:
- * Zero on success; a negated errno value on failure.
- *
- ****************************************************************************/
-
-static int stm32_ioctl(FAR struct watchdog_lowerhalf_s *lower, int cmd,
- unsigned long arg)
-{
- FAR struct stm32_lowerhalf_s *priv = (FAR struct stm32_lowerhalf_s *)lower;
- int ret = -ENOTTY;
-
- DEBUGASSERT(priv);
- wdvdbg("Entry: cmd=%d arg=%ld\n", cmd, arg);
-
- /* WDIOC_MINTIME: Set the minimum ping time. If two keepalive ioctls
- * are received within this time, a reset event will be generated.
- * Argument: A 32-bit time value in milliseconds.
- */
-
- if (cmd == WDIOC_MINTIME)
- {
- uint32_t mintime = (uint32_t)arg;
-
- /* The minimum time should be strictly less than the total delay
- * which, in turn, will be less than or equal to WWDG_CR_T_MAX
- */
-
- ret = -EINVAL;
- if (mintime < priv->timeout)
- {
- uint32_t window = (priv->timeout - mintime) * priv->fwwdg / 1000 - 1;
- DEBUGASSERT(window < priv->reload);
- stm32_setwindow(priv, window | WWDG_CR_T_RESET);
- ret = OK;
- }
- }
-
- return ret;
-}
-
-/****************************************************************************
- * Public Functions
- ****************************************************************************/
-
-/****************************************************************************
- * Name: stm32_wwdginitialize
- *
- * Description:
- * Initialize the WWDG watchdog time. The watchdog timer is intialized 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
- *
- * Returned Values:
- * None
- *
- ****************************************************************************/
-
-void stm32_wwdginitialize(FAR const char *devpath)
-{
- FAR struct stm32_lowerhalf_s *priv = &g_wdgdev;
-
- wdvdbg("Entry: devpath=%s\n", devpath);
-
- /* NOTE we assume that clocking to the IWDG has already been provided by
- * the RCC initialization logic.
- */
-
- /* Initialize the driver state structure. Here we assume: (1) the state
- * structure lies in .bss and was zeroed at reset time. (2) This function
- * is only called once so it is never necessary to re-zero the structure.
- */
-
- priv->ops = &g_wdgops;
-
- /* Attach our EWI interrupt handler (But don't enable it yet) */
-
- (void)irq_attach(STM32_IRQ_WWDG, stm32_interrupt);
-
- /* Select an arbitrary initial timeout value. But don't start the watchdog
- * yet. NOTE: If the "Hardware watchdog" feature is enabled through the
- * device option bits, the watchdog is automatically enabled at power-on.
- */
-
- stm32_settimeout((FAR struct watchdog_lowerhalf_s *)priv,
- CONFIG_STM32_WWDG_DEFTIMOUT);
-
- /* Register the watchdog driver as /dev/watchdog0 */
-
- (void)watchdog_register(devpath, (FAR struct watchdog_lowerhalf_s *)priv);
-
- /* When the microcontroller enters debug mode (Cortex™-M4F core halted),
- * the WWDG counter either continues to work normally or stops, depending
- * on DBG_WWDG_STOP configuration bit in DBG module.
- */
-
-#if defined(CONFIG_STM32_JTAG_FULL_ENABLE) || \
- defined(CONFIG_STM32_JTAG_NOJNTRST_ENABLE) || \
- defined(CONFIG_STM32_JTAG_SW_ENABLE)
- {
- uint32_t cr = getreg32(STM32_DBGMCU_CR);
- cr |= DBGMCU_CR_WWDGSTOP;
- putreg32(cr, STM32_DBGMCU_CR);
- }
-#endif
-}
-
-#endif /* CONFIG_WATCHDOG && CONFIG_STM32_WWDG */