1 /* $Id: xscuwdt.c,v 1.1.2.1 2011/01/20 04:04:40 sadanan Exp $ */
2 /******************************************************************************
4 * Copyright (C) 2010 - 2014 Xilinx, Inc. All rights reserved.
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * Use of the Software is limited solely to applications:
17 * (a) running on a Xilinx device, or
18 * (b) that interact with a Xilinx device through a bus or interconnect.
20 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
21 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
22 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
23 * XILINX BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
24 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
25 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
28 * Except as contained in this notice, the name of the Xilinx shall not be used
29 * in advertising or otherwise to promote the sale, use or other dealings in
30 * this Software without prior written authorization from Xilinx.
32 ******************************************************************************/
33 /****************************************************************************/
38 * Contains the implementation of interface functions of the XScuWdt driver.
39 * See xscuwdt.h for a description of the driver.
42 * MODIFICATION HISTORY:
44 * Ver Who Date Changes
45 * ----- --- -------- ---------------------------------------------
46 * 1.00a sdm 01/15/10 First release
49 ******************************************************************************/
51 /***************************** Include Files *********************************/
55 /************************** Constant Definitions *****************************/
57 /**************************** Type Definitions *******************************/
59 /***************** Macros (Inline Functions) Definitions *********************/
61 /************************** Function Prototypes ******************************/
63 /************************** Variable Definitions *****************************/
65 /****************************************************************************/
68 * Initialize a specific watchdog timer instance/driver. This function
69 * must be called before other functions of the driver are called.
71 * @param InstancePtr is a pointer to the XScuWdt instance.
72 * @param ConfigPtr is the config structure.
73 * @param EffectiveAddress is the base address for the device. It could be
74 * a virtual address if address translation is supported in the
75 * system, otherwise it is the physical address.
78 * - XST_SUCCESS if initialization was successful.
79 * - XST_DEVICE_IS_STARTED if the device has already been started.
81 * @note This function enables the watchdog mode.
83 ******************************************************************************/
84 int XScuWdt_CfgInitialize(XScuWdt *InstancePtr,
85 XScuWdt_Config *ConfigPtr, u32 EffectiveAddress)
87 Xil_AssertNonvoid(InstancePtr != NULL);
88 Xil_AssertNonvoid(ConfigPtr != NULL);
91 * If the device is started, disallow the initialize and return a
92 * status indicating it is started. This allows the user to stop the
93 * device and reinitialize, but prevents a user from inadvertently
96 if (InstancePtr->IsStarted == XIL_COMPONENT_IS_STARTED) {
97 return XST_DEVICE_IS_STARTED;
101 * Copy configuration into instance.
103 InstancePtr->Config.DeviceId = ConfigPtr->DeviceId;
106 * Save the base address pointer such that the registers of the block
107 * can be accessed and indicate it has not been started yet.
109 InstancePtr->Config.BaseAddr = EffectiveAddress;
110 InstancePtr->IsStarted = 0;
113 * Put the watchdog timer in Watchdog mode.
115 XScuWdt_SetWdMode(InstancePtr);
118 * Indicate the instance is ready to use, successfully initialized.
120 InstancePtr->IsReady = XIL_COMPONENT_IS_READY;
125 /****************************************************************************/
128 * Start the watchdog counter of the device.
130 * @param InstancePtr is a pointer to the XScuWdt instance.
134 * @note User needs to select the appropriate mode (watchdog/timer)
135 * before using this API.
136 * See XScuWdt_SetWdMode/XScuWdt_SetTimerMode macros in
139 ******************************************************************************/
140 void XScuWdt_Start(XScuWdt *InstancePtr)
144 Xil_AssertVoid(InstancePtr != NULL);
145 Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
148 * Read the contents of the Control register.
150 Register = XScuWdt_ReadReg(InstancePtr->Config.BaseAddr,
151 XSCUWDT_CONTROL_OFFSET);
154 * Set the 'watchdog enable' bit in the register.
156 Register |= XSCUWDT_CONTROL_WD_ENABLE_MASK;
159 * Update the Control register with the new value.
161 XScuWdt_WriteReg(InstancePtr->Config.BaseAddr,
162 XSCUWDT_CONTROL_OFFSET, Register);
165 * Indicate that the device is started.
167 InstancePtr->IsStarted = XIL_COMPONENT_IS_STARTED;
170 /****************************************************************************/
173 * Stop the watchdog timer.
175 * @param InstancePtr is a pointer to the XScuWdt instance.
181 ******************************************************************************/
182 void XScuWdt_Stop(XScuWdt *InstancePtr)
186 Xil_AssertVoid(InstancePtr != NULL);
187 Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
190 * Read the contents of the Control register.
192 Register = XScuWdt_ReadReg(InstancePtr->Config.BaseAddr,
193 XSCUWDT_CONTROL_OFFSET);
196 * Clear the 'watchdog enable' bit in the register.
198 Register &= ~XSCUWDT_CONTROL_WD_ENABLE_MASK;
201 * Update the Control register with the new value.
203 XScuWdt_WriteReg(InstancePtr->Config.BaseAddr,
204 XSCUWDT_CONTROL_OFFSET, Register);
207 * Indicate that the device is stopped.
209 InstancePtr->IsStarted = 0;