/** * * Write a CompactFlash sector. This is a blocking, low-level function which * does not return until the specified sector is written in its entirety. * * @param BaseAddress is the base address of the device * @param SectorId is the id of the sector to write * @param BufferPtr is a pointer to a buffer used to write the sector. * * @return * * The number of bytes written. If this number is not equal to the sector size, * 512 bytes, then an error occurred. * * @note * * None. * ******************************************************************************/ int XSysAce_WriteSector(Xuint32 BaseAddress, Xuint32 SectorId, Xuint8 *BufferPtr) { int NumSent; /* Get the lock */ XSysAce_mWaitForLock(BaseAddress); /* See if the CF is ready for a command */ if (!XSysAce_mIsReadyForCmd(BaseAddress)) { return 0; } /* Write the sector ID (LBA) */ XSysAce_RegWrite32(BaseAddress + XSA_MLR_OFFSET, SectorId); /* Send a write command of one sector to the controller */ XSysAce_RegWrite16(BaseAddress + XSA_SCCR_OFFSET, XSA_SCCR_WRITEDATA_MASK | 1); /* Reset configuration controller (be sure to keep the lock) */ XSysAce_mOrControlReg(BaseAddress, XSA_CR_CFGRESET_MASK); /* Write a sector of data to the data buffer */ NumSent = XSysAce_WriteDataBuffer(BaseAddress, BufferPtr, XSA_CF_SECTOR_SIZE); /* Clear reset of configuration controller and locks */ XSysAce_mAndControlReg(BaseAddress, ~(XSA_CR_CFGRESET_MASK | XSA_CR_LOCKREQ_MASK)); return NumSent; }
/** * * Write data to the CompactFlash. The user specifies the starting sector ID * and the number of sectors to be written. The minimum unit that can be written * to the CompactFlash is a sector, which is 512 bytes. * * In polled mode, this write is blocking. If there are other tasks in the * system that must run, it is best to keep the number of sectors to be written * to a minimum (e.g., 1). In interrupt mode, this write is non-blocking and an * event, XSA_EVENT_DATA_DONE, is returned to the user in the asynchronous * event handler when the write is complete. The user must call * XSysAce_EnableInterrupt() to put the driver/device into interrupt mode. * * An MPU lock, obtained using XSysAce_Lock(), must be granted before calling * this function. If a lock has not been granted, no action is taken and an * error is returned. * * @param InstancePtr is a pointer to the XSysAce instance to be worked on. * @param StartSector is the starting sector ID from where data will be written. * Sector IDs range from 0 (first sector) to 0x10000000. * @param NumSectors is the number of sectors to write. The range can be from * 1 to 256. * @param BufferPtr is a pointer to the data buffer to be written. This buffer * must have at least (512 * NumSectors) bytes. * * @return * * - XST_SUCCESS if the write was successful. In interrupt mode, this does not * mean the write is complete, only that it has begun. An event is returned * to the user when the write is complete. * - XST_SYSACE_NO_LOCK if no MPU lock has yet been granted * - XST_DEVICE_BUSY if the ACE controller is not ready for a command * - XST_FAILURE if an error occurred during the write. The user should call * XSysAce_GetErrors() to determine the cause of the error. * * @note * * None. * * @internal * * Polled mode is blocking under the assumption that a single sector can be * transferred at a very fast rate (>20 Mbps). So, the user can choose to * transfer only single sectors when in polled mode, thus allowing time for * other work to be done. The biggest issue is that although data transfer * rates are high, seek time for CompactFlash cards is slow (5-20 ms on * average, depending on the type of device). We could move to a non-blocking * solution that transfers 32 bytes at a time (the entire data buffer) and * then returns. The user would then need to increment its buffer pointer * appropriately and call the read/write again. The driver would need some way * to know not to issue a new command to the CompactFlash, but instead continue * with the previous command. This can be done either with a NumSectors argument * of zero to indicate that there is already an operation in progress, or by * having the driver keep state to know there is an operation in progress. The * interface for either seems a bit awkward. Also, the hit for seek time needs * to be taken regardless of the blocking or non-blocking nature of the call, so * the additional few microseconds to transfer a sector of data seems acceptable. * ******************************************************************************/ int XSysAce_SectorWrite(XSysAce *InstancePtr, u32 StartSector, int NumSectors, u8 *BufferPtr) { u16 SectorCmd; int NumSent; int BytesToSend; Xil_AssertNonvoid(InstancePtr != NULL); Xil_AssertNonvoid(NumSectors > 0 && NumSectors <= (XSA_SCCR_COUNT_MASK + 1)); Xil_AssertNonvoid(BufferPtr != NULL); Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY); /* If a lock has not been granted, return an error */ if (!XSysAce_IsMpuLocked(InstancePtr->BaseAddress)) { return XST_SYSACE_NO_LOCK; } /* See if the CF is ready for a command */ if (!XSysAce_IsReadyForCmd(InstancePtr->BaseAddress)) { return XST_DEVICE_BUSY; } /* Write the sector ID (LBA) */ XSysAce_RegWrite32(InstancePtr->BaseAddress + XSA_MLR_OFFSET, StartSector); /* * Send the write command for the number of sectors specified */ SectorCmd = (NumSectors & XSA_SCCR_COUNT_MASK) | XSA_SCCR_WRITEDATA_MASK; XSysAce_RegWrite16(InstancePtr->BaseAddress + XSA_SCCR_OFFSET, SectorCmd); BytesToSend = XSA_CF_SECTOR_SIZE * NumSectors; /* * If in interrupt mode, set up the state variables and enable the * data-buffer-ready interrupt. We do this after the write command above * is done in order to guarantee that the interrupt occurs only after the * first data buffer write is done below (an interrupt may or may not occur * after the write command is issued) */ if (XSysAce_IsIntrEnabled(InstancePtr->BaseAddress)) { /* * Set the state variables. We're going to send one data buffer here in * this routine, so adjust the buffer pointer and number remaining to * reflect this. */ InstancePtr->NumRequested = BytesToSend; InstancePtr->NumRemaining = BytesToSend - XSA_DATA_BUFFER_SIZE; InstancePtr->BufferPtr = BufferPtr + XSA_DATA_BUFFER_SIZE; /* Send only one data buffer in interrupt mode */ BytesToSend = XSA_DATA_BUFFER_SIZE; XSysAce_OrControlReg(InstancePtr->BaseAddress, XSA_CR_DATARDYIRQ_MASK); } NumSent = XSysAce_WriteDataBuffer(InstancePtr->BaseAddress, BufferPtr, BytesToSend); if (NumSent != BytesToSend) { /* an error occurred, report this to the user */ return XST_FAILURE; } return XST_SUCCESS; }
/** * * Read at least one sector of data from the CompactFlash. The user specifies * the starting sector ID and the number of sectors to be read. The minimum unit * that can be read from the CompactFlash is a sector, which is 512 bytes. * * In polled mode, this read is blocking. If there are other tasks in the system * that must run, it is best to keep the number of sectors to be read to a * minimum (e.g., 1). In interrupt mode, this read is non-blocking and an event, * XSA_EVENT_DATA_DONE, is returned to the user in the asynchronous event * handler when the read is complete. The user must call * XSysAce_EnableInterrupt() to put the driver/device into interrupt mode. * * An MPU lock, obtained using XSysAce_Lock(), must be granted before calling * this function. If a lock has not been granted, no action is taken and an * error is returned. * * @param InstancePtr is a pointer to the XSysAce instance. * @param StartSector is the starting sector ID from where data will * be read. * Sector IDs range from 0 (first sector) to 0x10000000. * @param NumSectors is the number of sectors to read. * The range can be from 1 to 256. * @param BufferPtr is a pointer to a buffer where the data will be * stored. The user must ensure it is big enough to hold * (512 * NumSectors) bytes. * * @return * - XST_SUCCESS if the read was successful. In interrupt mode, * this does not mean the read is complete, only that it has begun. * An event is returned to the user when the read is complete. * - XST_SYSACE_NO_LOCK if no MPU lock has yet been granted * - XST_DEVICE_BUSY if the ACE controller is not ready for a * command * - XST_FAILURE if an error occurred during the read. The user * should call XSysAce_GetErrors() to determine the cause of the * error. * * @note None. * * @internal * * Polled mode is blocking under the assumption that a single sector can be * transferred at a very fast rate (>20 Mbps). So, the user can choose to * transfer only single sectors when in polled mode, thus allowing time for * other work to be done. The biggest issue is that although data transfer * rates are high, seek time for CompactFlash cards is slow (5-20 ms on * average, depending on the type of device). We could move to a non-blocking * solution that transfers 32 bytes at a time (the entire data buffer) and * then returns. The user would then need to increment its buffer pointer * appropriately and call the read/write again. The driver would need some way * to know not to issue a new command to the CompactFlash, but instead continue * with the previous command. This can be done either with a NumSectors argument * of zero to indicate that there is already an operation in progress, or by * having the driver keep state to know there is an operation in progress. The * interface for either seems a bit awkward. Also, the hit for seek time needs * to be taken regardless of the blocking or non-blocking nature of the call, so * the additional few microseconds to transfer a sector of data seems acceptable. * ******************************************************************************/ int XSysAce_SectorRead(XSysAce *InstancePtr, u32 StartSector, int NumSectors, u8 *BufferPtr) { u16 SectorCmd; int BytesToRecv; Xil_AssertNonvoid(InstancePtr != NULL); Xil_AssertNonvoid(NumSectors > 0 && NumSectors <= (XSA_SCCR_COUNT_MASK + 1)); Xil_AssertNonvoid(BufferPtr != NULL); Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY); /* If a lock has not been granted, return an error */ if (!XSysAce_IsMpuLocked(InstancePtr->BaseAddress)) { return XST_SYSACE_NO_LOCK; } /* See if the CF is ready for a command */ if (!XSysAce_IsReadyForCmd(InstancePtr->BaseAddress)) { return XST_DEVICE_BUSY; } BytesToRecv = XSA_CF_SECTOR_SIZE * NumSectors; /* * If in interrupt mode, set up the state variables and enable the * data-buffer-ready interrupt. This needs to be done before the command * is sent to the ACE, which will cause the interrupt to occur. */ if (XSysAce_IsIntrEnabled(InstancePtr->BaseAddress)) { InstancePtr->NumRequested = BytesToRecv; InstancePtr->NumRemaining = BytesToRecv; InstancePtr->BufferPtr = BufferPtr; XSysAce_OrControlReg(InstancePtr->BaseAddress, XSA_CR_DATARDYIRQ_MASK); } /* Write the sector ID (LBA) */ XSysAce_RegWrite32(InstancePtr->BaseAddress + XSA_MLR_OFFSET, StartSector); /* * Send the read command for the number of sectors specified */ SectorCmd = (NumSectors & XSA_SCCR_COUNT_MASK) | XSA_SCCR_READDATA_MASK; XSysAce_RegWrite16(InstancePtr->BaseAddress + XSA_SCCR_OFFSET, SectorCmd); /* * If in polled mode, receive the entire amount requested */ if (!XSysAce_IsIntrEnabled(InstancePtr->BaseAddress)) { int NumRead; /* Reset configuration controller (be sure to keep the lock) */ /* This breaks mvl, beware! */ /*XSysAce_OrControlReg(InstancePtr->BaseAddress, XSA_CR_CFGRESET_MASK); */ NumRead = XSysAce_ReadDataBuffer(InstancePtr->BaseAddress, BufferPtr, BytesToRecv); /* Clear reset of configuration controller */ /* This breaks mvl, beware! */ /*XSysAce_AndControlReg(InstancePtr->BaseAddress, ~(XSA_CR_CFGRESET_MASK)); */ if (NumRead != BytesToRecv) { /* an error occurred, report this to the user */ return XST_FAILURE; } } return XST_SUCCESS; }