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31 ******************************************************************************/
32 /****************************************************************************/
36 * @addtogroup scuwdt_v2_1
40 * The Xilinx SCU watchdog timer driver (XScuWdt) supports the Xilinx SCU private
41 * watchdog timer hardware.
43 * The XScuWdt driver supports the following features:
46 * - Auto reload (timer mode only)
48 * The watchdog counter register is a down counter and starts decrementing when
49 * the watchdog is started.
50 * In watchdog mode, when the counter reaches 0, the Reset flag is set in the
51 * Reset status register and the WDRESETREQ pin is asserted, causing a system
52 * reset. The Reset flag is not reset by normal processor reset and is cleared
53 * when written with a value of 1. This enables the user to differentiate a
54 * normal reset and a reset caused by watchdog time-out. The user needs to call
55 * XScuWdt_RestartWdt() periodically, to avoid the watchdog from being timed-out.
57 * The IsWdtExpired function can be used to check if the watchdog was the cause
58 * of the last reset. In this situation, call Initialize then call IsWdtExpired.
59 * If the result is true, watchdog timeout caused the last system reset. The
60 * application then needs to clear the Reset flag.
62 * In timer mode, when the counter reaches 0, the Event flag is set in the
63 * Interrupt status register and if interrupts are enabled, interrupt ID 30 is
64 * set as pending in the interrupt distributor. The IsTimerExpired function
65 * is used to check if the watchdog counter has decremented to 0 in timer mode.
66 * If auto-reload mode is enabled, the Counter register is automatically reloaded
67 * from the Load register.
69 * <b> Initialization and Configuration </b>
71 * The device driver enables higher layer software (e.g., an application) to
72 * communicate with the Watchdog Timer.
74 * XScuWdt_CfgInitialize() API is used to initialize the Watchdog Timer. The
75 * user needs to first call the XScuWdt_LookupConfig() API which returns
76 * the Configuration structure pointer which is passed as a parameter to
77 * the XScuWdt_CfgInitialize() API.
81 * The SCU Watchdog Timer supports interrupts in Timer mode.
83 * This driver does not provide a Interrupt Service Routine (ISR) for the device.
84 * It is the responsibility of the application to provide one if needed. Refer to
85 * the interrupt example provided with this driver for details on using the
86 * Timer in interrupt mode.
88 * <b> Virtual Memory </b>
90 * This driver supports Virtual Memory. The RTOS is responsible for calculating
91 * the correct device base address in Virtual Memory space.
95 * This driver is not thread safe. Any needs for threads or thread mutual
96 * exclusion must be satisfied by the layer above this driver.
100 * Asserts are used within all Xilinx drivers to enforce constraints on argument
101 * values. Asserts can be turned off on a system-wide basis by defining, at
102 * compile time, the NDEBUG identifier. By default, asserts are turned on and it
103 * is recommended that users leave asserts on during development.
105 * <b> Building the driver </b>
107 * The XScuWdt driver is composed of several source files. This allows the user
108 * to build and link only those parts of the driver that are necessary.
113 * The watchdog timer is not a part of the snoop control unit as indicated
114 * by the prefix "scu" in the name of the driver.
115 * It is an independent module in APU.
118 * MODIFICATION HISTORY:
120 * Ver Who Date Changes
121 * ----- --- -------- ---------------------------------------------
122 * 1.00a sdm 01/15/10 First release
123 * 1.02a sg 07/17/12 Included xil_assert.h for CR 667947. This is an issue
124 * when the xstatus.h in the common driver overwrites
125 * the xstatus.h of the standalone BSP during the
127 * 2.1 sk 02/26/15 Modified the code for MISRA-C:2012 compliance.
128 * ms 03/17/17 Added readme.txt file in examples folder for doxygen
132 ******************************************************************************/
133 #ifndef XSCUWDT_H /* prevent circular inclusions */
134 #define XSCUWDT_H /* by using protection macros */
136 /***************************** Include Files *********************************/
139 #include "xscuwdt_hw.h"
145 /************************** Constant Definitions *****************************/
147 /**************************** Type Definitions *******************************/
150 * This typedef contains configuration information for the device.
153 u16 DeviceId; /**< Unique ID of device */
154 u32 BaseAddr; /**< Base address of the device */
158 * The XScuWdt driver instance data. The user is required to allocate a
159 * variable of this type for every watchdog/timer device in the system.
160 * A pointer to a variable of this type is then passed to the driver API
164 XScuWdt_Config Config;/**< Hardware Configuration */
165 u32 IsReady; /**< Device is initialized and ready */
166 u32 IsStarted; /**< Device watchdog timer is running */
169 /***************** Macros (Inline Functions) Definitions *********************/
170 /****************************************************************************/
173 * This function is used to check if the watchdog has timed-out and the last
174 * reset was caused by the watchdog reset.
176 * @param InstancePtr is a pointer to the XScuWdt instance.
179 * - TRUE if the watchdog has expired.
180 * - FALSE if the watchdog has not expired.
182 * @note C-style signature:
183 * int XScuWdt_IsWdtExpired(XScuWdt *InstancePtr)
185 ******************************************************************************/
186 #define XScuWdt_IsWdtExpired(InstancePtr) \
187 ((XScuWdt_ReadReg((InstancePtr)->Config.BaseAddr, \
188 XSCUWDT_RST_STS_OFFSET) & \
189 XSCUWDT_RST_STS_RESET_FLAG_MASK) == XSCUWDT_RST_STS_RESET_FLAG_MASK)
191 /****************************************************************************/
194 * This function is used to check if the watchdog counter has reached 0 in timer
197 * @param InstancePtr is a pointer to the XScuWdt instance.
200 * - TRUE if the watchdog has expired.
201 * - FALSE if the watchdog has not expired.
203 * @note C-style signature:
204 * int XScuWdt_IsTimerExpired(XScuWdt *InstancePtr)
206 ******************************************************************************/
207 #define XScuWdt_IsTimerExpired(InstancePtr) \
208 ((XScuWdt_ReadReg((InstancePtr)->Config.BaseAddr, \
209 XSCUWDT_ISR_OFFSET) & \
210 XSCUWDT_ISR_EVENT_FLAG_MASK) == XSCUWDT_ISR_EVENT_FLAG_MASK)
212 /****************************************************************************/
215 * Re-start the watchdog timer. This macro will read the watchdog load register
216 * and write the same value to load register to update the counter register.
217 * An application needs to call this function periodically to keep the watchdog
218 * from asserting the WDRESETREQ reset request output pin.
220 * @param InstancePtr is a pointer to the XScuWdt instance.
224 * @note C-style signature:
225 * void XScuWdt_RestartWdt(XScuWdt *InstancePtr)
227 ******************************************************************************/
228 #define XScuWdt_RestartWdt(InstancePtr) \
229 XScuWdt_LoadWdt((InstancePtr), \
230 (XScuWdt_ReadReg((InstancePtr)->Config.BaseAddr, \
231 XSCUWDT_LOAD_OFFSET)))
233 /****************************************************************************/
236 * Write to the watchdog timer load register. This will also update the
237 * watchdog counter register with the new value. This macro can be used to
238 * change the time-out value.
240 * @param InstancePtr is a pointer to the XScuWdt instance.
241 * @param Value is the value to be written to the Watchdog Load register.
245 * @note C-style signature:
246 * void XScuWdt_LoadWdt(XScuWdt *InstancePtr, u32 Value)
248 ******************************************************************************/
249 #define XScuWdt_LoadWdt(InstancePtr, Value) \
250 XScuWdt_WriteReg((InstancePtr)->Config.BaseAddr, \
251 XSCUWDT_LOAD_OFFSET, (Value))
253 /****************************************************************************/
256 * Put the watchdog timer in Watchdog mode by setting the WD mode bit of the
257 * Watchdog control register.
259 * @param InstancePtr is a pointer to the XScuWdt instance.
263 * @note C-style signature:
264 * void XScuWdt_SetWdMode(XScuWdt *InstancePtr)
266 ******************************************************************************/
267 #define XScuWdt_SetWdMode(InstancePtr) \
268 XScuWdt_WriteReg((InstancePtr)->Config.BaseAddr, \
269 XSCUWDT_CONTROL_OFFSET, \
270 (XScuWdt_ReadReg((InstancePtr)->Config.BaseAddr, \
271 XSCUWDT_CONTROL_OFFSET) | \
272 (XSCUWDT_CONTROL_WD_MODE_MASK)))
274 /****************************************************************************/
277 * Put the watchdog timer in Timer mode by writing 0x12345678 and 0x87654321
278 * successively to the Watchdog Disable Register.
279 * The software must write 0x12345678 and 0x87654321 successively to the
280 * Watchdog Disable Register so that the watchdog mode bit in the Watchdog
281 * Control Register is set to zero.
283 * @param InstancePtr is a pointer to the XScuWdt instance.
287 * @note C-style signature:
288 * void XScuWdt_SetTimerMode(XScuWdt *InstancePtr)
290 ******************************************************************************/
291 #define XScuWdt_SetTimerMode(InstancePtr) \
293 XScuWdt_WriteReg((InstancePtr)->Config.BaseAddr, \
294 XSCUWDT_DISABLE_OFFSET, \
295 XSCUWDT_DISABLE_VALUE1); \
296 XScuWdt_WriteReg((InstancePtr)->Config.BaseAddr, \
297 XSCUWDT_DISABLE_OFFSET, \
298 XSCUWDT_DISABLE_VALUE2); \
301 /****************************************************************************/
304 * Get the contents of the watchdog control register.
306 * @param InstancePtr is a pointer to the XScuWdt instance.
308 * @return Contents of the watchdog control register.
310 * @note C-style signature:
311 u32 XScuWdt_GetControlReg(XScuWdt *InstancePtr)
313 ******************************************************************************/
314 #define XScuWdt_GetControlReg(InstancePtr) \
315 XScuWdt_ReadReg((InstancePtr)->Config.BaseAddr, \
316 XSCUWDT_CONTROL_OFFSET)
318 /****************************************************************************/
321 * Write to the watchdog control register.
323 * @param InstancePtr is a pointer to the XScuWdt instance.
324 * @param ControlReg is the value to be written to the watchdog control
329 * @note C-style signature:
330 void XScuWdt_SetControlReg(XScuWdt *InstancePtr, u32 ControlReg)
332 ******************************************************************************/
333 #define XScuWdt_SetControlReg(InstancePtr, ControlReg) \
334 XScuWdt_WriteReg((InstancePtr)->Config.BaseAddr, \
335 XSCUWDT_CONTROL_OFFSET, (ControlReg))
337 /****************************************************************************/
340 * Enable auto-reload mode.
342 * @param InstancePtr is a pointer to the XScuWdt instance.
346 * @note C-style signature:
347 * void XScuWdt_EnableAutoReload(XScuWdt *InstancePtr)
349 ******************************************************************************/
350 #define XScuWdt_EnableAutoReload(InstancePtr) \
351 XScuWdt_SetControlReg((InstancePtr), \
352 (XScuWdt_GetControlReg(InstancePtr) | \
353 XSCUWDT_CONTROL_AUTO_RELOAD_MASK))
355 /************************** Function Prototypes ******************************/
358 * Lookup configuration in xscuwdt_sinit.c.
360 XScuWdt_Config *XScuWdt_LookupConfig(u16 DeviceId);
363 * Selftest function in xscuwdt_selftest.c
365 s32 XScuWdt_SelfTest(XScuWdt *InstancePtr);
368 * Interface functions in xscuwdt.c
370 s32 XScuWdt_CfgInitialize(XScuWdt *InstancePtr,
371 XScuWdt_Config *ConfigPtr, u32 EffectiveAddress);
373 void XScuWdt_Start(XScuWdt *InstancePtr);
375 void XScuWdt_Stop(XScuWdt *InstancePtr);
382 #endif /* end of protection macro */