1 /* $Id: xscuwdt.c,v 1.1.2.1 2011/01/20 04:04:40 sadanan Exp $ */
2 /******************************************************************************
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32 ******************************************************************************/
33 /****************************************************************************/
37 * @addtogroup scuwdt_v2_0
40 * Contains the implementation of interface functions of the XScuWdt driver.
41 * See xscuwdt.h for a description of the driver.
44 * MODIFICATION HISTORY:
46 * Ver Who Date Changes
47 * ----- --- -------- ---------------------------------------------
48 * 1.00a sdm 01/15/10 First release
51 ******************************************************************************/
53 /***************************** Include Files *********************************/
57 /************************** Constant Definitions *****************************/
59 /**************************** Type Definitions *******************************/
61 /***************** Macros (Inline Functions) Definitions *********************/
63 /************************** Function Prototypes ******************************/
65 /************************** Variable Definitions *****************************/
67 /****************************************************************************/
70 * Initialize a specific watchdog timer instance/driver. This function
71 * must be called before other functions of the driver are called.
73 * @param InstancePtr is a pointer to the XScuWdt instance.
74 * @param ConfigPtr is the config structure.
75 * @param EffectiveAddress is the base address for the device. It could be
76 * a virtual address if address translation is supported in the
77 * system, otherwise it is the physical address.
80 * - XST_SUCCESS if initialization was successful.
81 * - XST_DEVICE_IS_STARTED if the device has already been started.
83 * @note This function enables the watchdog mode.
85 ******************************************************************************/
86 int XScuWdt_CfgInitialize(XScuWdt *InstancePtr,
87 XScuWdt_Config *ConfigPtr, u32 EffectiveAddress)
89 Xil_AssertNonvoid(InstancePtr != NULL);
90 Xil_AssertNonvoid(ConfigPtr != NULL);
93 * If the device is started, disallow the initialize and return a
94 * status indicating it is started. This allows the user to stop the
95 * device and reinitialize, but prevents a user from inadvertently
98 if (InstancePtr->IsStarted == XIL_COMPONENT_IS_STARTED) {
99 return XST_DEVICE_IS_STARTED;
103 * Copy configuration into instance.
105 InstancePtr->Config.DeviceId = ConfigPtr->DeviceId;
108 * Save the base address pointer such that the registers of the block
109 * can be accessed and indicate it has not been started yet.
111 InstancePtr->Config.BaseAddr = EffectiveAddress;
112 InstancePtr->IsStarted = 0;
115 * Put the watchdog timer in Watchdog mode.
117 XScuWdt_SetWdMode(InstancePtr);
120 * Indicate the instance is ready to use, successfully initialized.
122 InstancePtr->IsReady = XIL_COMPONENT_IS_READY;
127 /****************************************************************************/
130 * Start the watchdog counter of the device.
132 * @param InstancePtr is a pointer to the XScuWdt instance.
136 * @note User needs to select the appropriate mode (watchdog/timer)
137 * before using this API.
138 * See XScuWdt_SetWdMode/XScuWdt_SetTimerMode macros in
141 ******************************************************************************/
142 void XScuWdt_Start(XScuWdt *InstancePtr)
146 Xil_AssertVoid(InstancePtr != NULL);
147 Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
150 * Read the contents of the Control register.
152 Register = XScuWdt_ReadReg(InstancePtr->Config.BaseAddr,
153 XSCUWDT_CONTROL_OFFSET);
156 * Set the 'watchdog enable' bit in the register.
158 Register |= XSCUWDT_CONTROL_WD_ENABLE_MASK;
161 * Update the Control register with the new value.
163 XScuWdt_WriteReg(InstancePtr->Config.BaseAddr,
164 XSCUWDT_CONTROL_OFFSET, Register);
167 * Indicate that the device is started.
169 InstancePtr->IsStarted = XIL_COMPONENT_IS_STARTED;
172 /****************************************************************************/
175 * Stop the watchdog timer.
177 * @param InstancePtr is a pointer to the XScuWdt instance.
183 ******************************************************************************/
184 void XScuWdt_Stop(XScuWdt *InstancePtr)
188 Xil_AssertVoid(InstancePtr != NULL);
189 Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
192 * Read the contents of the Control register.
194 Register = XScuWdt_ReadReg(InstancePtr->Config.BaseAddr,
195 XSCUWDT_CONTROL_OFFSET);
198 * Clear the 'watchdog enable' bit in the register.
200 Register &= ~XSCUWDT_CONTROL_WD_ENABLE_MASK;
203 * Update the Control register with the new value.
205 XScuWdt_WriteReg(InstancePtr->Config.BaseAddr,
206 XSCUWDT_CONTROL_OFFSET, Register);
209 * Indicate that the device is stopped.
211 InstancePtr->IsStarted = 0;