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31 ******************************************************************************/
32 /*****************************************************************************/
36 * @addtogroup canps_v3_0
39 * This file contains functions related to CAN interrupt handling.
42 * MODIFICATION HISTORY:
44 * Ver Who Date Changes
45 * ----- ----- -------- -----------------------------------------------
46 * 1.00a xd/sv 01/12/10 First release
47 * 3.00 kvn 02/13/15 Modified code for MISRA-C:2012 compliance.
48 * 3.1 nsk 12/21/15 Updated XCanPs_IntrHandler to handle error
49 * interrupts correctly. CR#925615
52 ******************************************************************************/
54 /***************************** Include Files *********************************/
58 /************************** Constant Definitions *****************************/
60 /**************************** Type Definitions *******************************/
62 /***************** Macros (Inline Functions) Definitions *********************/
64 /************************** Variable Definitions *****************************/
66 /************************** Function Prototypes ******************************/
68 /****************************************************************************/
71 * This routine enables interrupt(s). Use the XCANPS_IXR_* constants defined in
72 * xcanps_hw.h to create the bit-mask to enable interrupts.
74 * @param InstancePtr is a pointer to the XCanPs instance.
75 * @param Mask is the mask to enable. Bit positions of 1 will be enabled.
76 * Bit positions of 0 will keep the previous setting. This mask is
77 * formed by OR'ing XCANPS_IXR_* bits defined in xcanps_hw.h.
83 *****************************************************************************/
84 void XCanPs_IntrEnable(XCanPs *InstancePtr, u32 Mask)
88 Xil_AssertVoid(InstancePtr != NULL);
89 Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
92 * Write to the IER to enable the specified interrupts.
94 IntrValue = XCanPs_IntrGetEnabled(InstancePtr);
96 XCanPs_WriteReg(InstancePtr->CanConfig.BaseAddr,
97 XCANPS_IER_OFFSET, IntrValue);
100 /****************************************************************************/
103 * This routine disables interrupt(s). Use the XCANPS_IXR_* constants defined in
104 * xcanps_hw.h to create the bit-mask to disable interrupt(s).
106 * @param InstancePtr is a pointer to the XCanPs instance.
107 * @param Mask is the mask to disable. Bit positions of 1 will be
108 * disabled. Bit positions of 0 will keep the previous setting.
109 * This mask is formed by OR'ing XCANPS_IXR_* bits defined in
116 *****************************************************************************/
117 void XCanPs_IntrDisable(XCanPs *InstancePtr, u32 Mask)
121 Xil_AssertVoid(InstancePtr != NULL);
122 Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
125 * Write to the IER to disable the specified interrupts.
127 IntrValue = XCanPs_IntrGetEnabled(InstancePtr);
129 XCanPs_WriteReg(InstancePtr->CanConfig.BaseAddr,
130 XCANPS_IER_OFFSET, IntrValue);
133 /****************************************************************************/
136 * This routine returns enabled interrupt(s). Use the XCANPS_IXR_* constants
137 * defined in xcanps_hw.h to interpret the returned value.
139 * @param InstancePtr is a pointer to the XCanPs instance.
141 * @return Enabled interrupt(s) in a 32-bit format.
145 *****************************************************************************/
146 u32 XCanPs_IntrGetEnabled(XCanPs *InstancePtr)
149 Xil_AssertNonvoid(InstancePtr != NULL);
150 Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
152 return XCanPs_ReadReg(InstancePtr->CanConfig.BaseAddr,
157 /****************************************************************************/
160 * This routine returns interrupt status read from Interrupt Status Register.
161 * Use the XCANPS_IXR_* constants defined in xcanps_hw.h to interpret the
164 * @param InstancePtr is a pointer to the XCanPs instance.
166 * @return The value stored in Interrupt Status Register.
170 *****************************************************************************/
171 u32 XCanPs_IntrGetStatus(XCanPs *InstancePtr)
173 Xil_AssertNonvoid(InstancePtr != NULL);
174 Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
176 return XCanPs_ReadReg(InstancePtr->CanConfig.BaseAddr,
180 /****************************************************************************/
183 * This function clears interrupt(s). Every bit set in Interrupt Status
184 * Register indicates that a specific type of interrupt is occurring, and this
185 * function clears one or more interrupts by writing a bit mask to Interrupt
188 * @param InstancePtr is a pointer to the XCanPs instance.
189 * @param Mask is the mask to clear. Bit positions of 1 will be cleared.
190 * Bit positions of 0 will not change the previous interrupt
191 * status. This mask is formed by OR'ing XCANPS_IXR_* bits defined
196 *****************************************************************************/
197 void XCanPs_IntrClear(XCanPs *InstancePtr, u32 Mask)
201 Xil_AssertVoid(InstancePtr != NULL);
202 Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
205 * Clear the currently pending interrupts.
207 IntrValue = XCanPs_IntrGetStatus(InstancePtr);
209 XCanPs_WriteReg(InstancePtr->CanConfig.BaseAddr, XCANPS_ICR_OFFSET,
213 /*****************************************************************************/
216 * This routine is the interrupt handler for the CAN driver.
218 * This handler reads the interrupt status from the ISR, determines the source of
219 * the interrupts, calls according callbacks, and finally clears the interrupts.
221 * Application beyond this driver is responsible for providing callbacks to
222 * handle interrupts and installing the callbacks using XCanPs_SetHandler()
223 * during initialization phase. An example delivered with this driver
224 * demonstrates how this could be done.
226 * @param InstancePtr is a pointer to the XCanPs instance that just
233 ******************************************************************************/
234 void XCanPs_IntrHandler(void *InstancePtr)
239 XCanPs *CanPtr = (XCanPs *) ((void *)InstancePtr);
241 Xil_AssertVoid(CanPtr != NULL);
242 Xil_AssertVoid(CanPtr->IsReady == XIL_COMPONENT_IS_READY);
244 PendingIntr = XCanPs_IntrGetStatus(CanPtr);
245 PendingIntr &= XCanPs_IntrGetEnabled(CanPtr);
248 * Clear all pending interrupts.
249 * Rising Edge interrupt
251 XCanPs_IntrClear(CanPtr, PendingIntr);
254 * An error interrupt is occurring.
256 if (((PendingIntr & XCANPS_IXR_ERROR_MASK) != (u32)0) &&
257 (CanPtr->ErrorHandler != NULL)) {
258 ErrorStatus = XCanPs_GetBusErrorStatus(CanPtr);
259 CanPtr->ErrorHandler(CanPtr->ErrorRef,ErrorStatus);
261 * Clear Error Status Register.
263 XCanPs_ClearBusErrorStatus(CanPtr,ErrorStatus);
267 * Check if any following event interrupt is pending:
269 * - RX FIFO Underflow
270 * - TX High Priority Buffer full
272 * - Wake up from sleep mode
274 * - Enter Bus off status
275 * - Arbitration is lost
277 * If so, call event callback provided by upper level.
279 EventIntr = PendingIntr & ((u32)XCANPS_IXR_RXOFLW_MASK |
280 (u32)XCANPS_IXR_RXUFLW_MASK |
281 (u32)XCANPS_IXR_TXBFLL_MASK |
282 (u32)XCANPS_IXR_TXFLL_MASK |
283 (u32)XCANPS_IXR_WKUP_MASK |
284 (u32)XCANPS_IXR_SLP_MASK |
285 (u32)XCANPS_IXR_BSOFF_MASK |
286 (u32)XCANPS_IXR_ARBLST_MASK);
287 if ((EventIntr != (u32)0) && (CanPtr->EventHandler != NULL)) {
288 CanPtr->EventHandler(CanPtr->EventRef, EventIntr);
290 if ((EventIntr & XCANPS_IXR_BSOFF_MASK) != (u32)0) {
292 * Event callback should reset whole device if "Enter
293 * Bus Off Status" interrupt occurred. All pending
294 * interrupts are cleared and no further checking and
295 * handling of other interrupts is needed any more.
299 /*This else was made for misra-c compliance*/
305 if (((PendingIntr & (XCANPS_IXR_RXFWMFLL_MASK |
306 XCANPS_IXR_RXNEMP_MASK)) != (u32)0) &&
307 (CanPtr->RecvHandler != NULL)) {
310 * This case happens when
311 * A number of frames depending on the Rx FIFO Watermark
312 * threshold are received.
313 * And also when frame was received and is sitting in RX FIFO.
315 * XCANPS_IXR_RXOK_MASK is not used because the bit is set
316 * just once even if there are multiple frames sitting
319 * XCANPS_IXR_RXNEMP_MASK is used because the bit can be
320 * set again and again automatically as long as there is
321 * at least one frame in RX FIFO.
323 CanPtr->RecvHandler(CanPtr->RecvRef);
327 * A frame was transmitted successfully.
329 if (((PendingIntr & (XCANPS_IXR_TXOK_MASK | XCANPS_IXR_TXFWMEMP_MASK)) != (u32)0) &&
330 (CanPtr->SendHandler != NULL)) {
331 CanPtr->SendHandler(CanPtr->SendRef);
336 /*****************************************************************************/
339 * This routine installs an asynchronous callback function for the given
343 * HandlerType Callback Function Type
344 * ----------------------- ------------------------
345 * XCANPS_HANDLER_SEND XCanPs_SendRecvHandler
346 * XCANPS_HANDLER_RECV XCanPs_SendRecvHandler
347 * XCANPS_HANDLER_ERROR XCanPs_ErrorHandler
348 * XCANPS_HANDLER_EVENT XCanPs_EventHandler
350 * HandlerType Invoked by this driver when:
351 * -------------------------------------------------------------------------
352 * XCANPS_HANDLER_SEND A frame transmitted by a call to
353 * XCanPs_Send() has been sent successfully.
355 * XCANPS_HANDLER_RECV A frame(s) has been received and is sitting in
358 * XCANPS_HANDLER_ERROR An error interrupt is occurring.
360 * XCANPS_HANDLER_EVENT Any other kind of interrupt is occurring.
363 * @param InstancePtr is a pointer to the XCanPs instance.
364 * @param HandlerType specifies which handler is to be attached.
365 * @param CallBackFunc is the address of the callback function.
366 * @param CallBackRef is a user data item that will be passed to the
367 * callback function when it is invoked.
370 * - XST_SUCCESS when handler is installed.
371 * - XST_INVALID_PARAM when HandlerType is invalid.
374 * Invoking this function for a handler that already has been installed replaces
375 * it with the new handler.
377 ******************************************************************************/
378 s32 XCanPs_SetHandler(XCanPs *InstancePtr, u32 HandlerType,
379 void *CallBackFunc, void *CallBackRef)
382 Xil_AssertNonvoid(InstancePtr != NULL);
383 Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
385 switch (HandlerType) {
386 case XCANPS_HANDLER_SEND:
387 InstancePtr->SendHandler =
388 (XCanPs_SendRecvHandler) CallBackFunc;
389 InstancePtr->SendRef = CallBackRef;
390 Status = XST_SUCCESS;
393 case XCANPS_HANDLER_RECV:
394 InstancePtr->RecvHandler =
395 (XCanPs_SendRecvHandler) CallBackFunc;
396 InstancePtr->RecvRef = CallBackRef;
397 Status = XST_SUCCESS;
400 case XCANPS_HANDLER_ERROR:
401 InstancePtr->ErrorHandler =
402 (XCanPs_ErrorHandler) CallBackFunc;
403 InstancePtr->ErrorRef = CallBackRef;
404 Status = XST_SUCCESS;
407 case XCANPS_HANDLER_EVENT:
408 InstancePtr->EventHandler =
409 (XCanPs_EventHandler) CallBackFunc;
410 InstancePtr->EventRef = CallBackRef;
411 Status = XST_SUCCESS;
415 Status = XST_INVALID_PARAM;