+++ /dev/null
-/******************************************************************************
-*
-* Copyright (C) 2010 - 2015 Xilinx, Inc. All rights reserved.
-*
-* Permission is hereby granted, free of charge, to any person obtaining a copy
-* of this software and associated documentation files (the "Software"), to deal
-* in the Software without restriction, including without limitation the rights
-* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-* copies of the Software, and to permit persons to whom the Software is
-* furnished to do so, subject to the following conditions:
-*
-* The above copyright notice and this permission notice shall be included in
-* all copies or substantial portions of the Software.
-*
-* Use of the Software is limited solely to applications:
-* (a) running on a Xilinx device, or
-* (b) that interact with a Xilinx device through a bus or interconnect.
-*
-* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
-* XILINX BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
-* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
-* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-* SOFTWARE.
-*
-* Except as contained in this notice, the name of the Xilinx shall not be used
-* in advertising or otherwise to promote the sale, use or other dealings in
-* this Software without prior written authorization from Xilinx.
-*
-******************************************************************************/
-/*****************************************************************************/
-/**
-*
-* @file xiicps.c
-* @addtogroup iicps_v3_0
-* @{
-*
-* Contains implementation of required functions for the XIicPs driver.
-* See xiicps.h for detailed description of the device and driver.
-*
-* <pre> MODIFICATION HISTORY:
-*
-* Ver Who Date Changes
-* ----- ------ -------- --------------------------------------------
-* 1.00a drg/jz 01/30/10 First release
-* 1.00a sdm 09/21/11 Updated the InstancePtr->Options in the
-* XIicPs_CfgInitialize by calling XIicPs_GetOptions.
-* 2.1 hk 04/25/14 Explicitly reset CR and clear FIFO in Abort function
-* and state the same in the comments. CR# 784254.
-* Fix for CR# 761060 - provision for repeated start.
-* 2.3 sk 10/07/14 Repeated start feature removed.
-* 3.0 sk 11/03/14 Modified TimeOut Register value to 0xFF
-* in XIicPs_Reset.
-* 12/06/14 Implemented Repeated start feature.
-* 01/31/15 Modified the code according to MISRAC 2012 Compliant.
-*
-* </pre>
-*
-******************************************************************************/
-
-/***************************** Include Files *********************************/
-
-#include "xiicps.h"
-
-/************************** Constant Definitions *****************************/
-
-/**************************** Type Definitions *******************************/
-
-/***************** Macros (Inline Functions) Definitions *********************/
-
-/************************** Function Prototypes ******************************/
-
-static void StubHandler(void *CallBackRef, u32 StatusEvent);
-
-/************************** Variable Definitions *****************************/
-
-
-/*****************************************************************************/
-/**
-*
-* Initializes a specific XIicPs instance such that the driver is ready to use.
-*
-* The state of the device after initialization is:
-* - Device is disabled
-* - Slave mode
-*
-* @param InstancePtr is a pointer to the XIicPs instance.
-* @param ConfigPtr is a reference to a structure containing information
-* about a specific IIC device. This function initializes an
-* InstancePtr object for a specific device specified by the
-* contents of Config.
-* @param EffectiveAddr is the device base address in the virtual memory
-* address space. The caller is responsible for keeping the address
-* mapping from EffectiveAddr to the device physical base address
-* unchanged once this function is invoked. Unexpected errors may
-* occur if the address mapping changes after this function is
-* called. If address translation is not used, use
-* ConfigPtr->BaseAddress for this parameter, passing the physical
-* address instead.
-*
-* @return The return value is XST_SUCCESS if successful.
-*
-* @note None.
-*
-******************************************************************************/
-s32 XIicPs_CfgInitialize(XIicPs *InstancePtr, XIicPs_Config *ConfigPtr,
- u32 EffectiveAddr)
-{
- /*
- * Assert validates the input arguments.
- */
- Xil_AssertNonvoid(InstancePtr != NULL);
- Xil_AssertNonvoid(ConfigPtr != NULL);
-
- /*
- * Set some default values.
- */
- InstancePtr->Config.DeviceId = ConfigPtr->DeviceId;
- InstancePtr->Config.BaseAddress = EffectiveAddr;
- InstancePtr->Config.InputClockHz = ConfigPtr->InputClockHz;
- InstancePtr->StatusHandler = StubHandler;
- InstancePtr->CallBackRef = NULL;
-
- InstancePtr->IsReady = (u32)XIL_COMPONENT_IS_READY;
-
- /*
- * Reset the IIC device to get it into its initial state. It is expected
- * that device configuration will take place after this initialization
- * is done, but before the device is started.
- */
- XIicPs_Reset(InstancePtr);
-
- /*
- * Keep a copy of what options this instance has.
- */
- InstancePtr->Options = XIicPs_GetOptions(InstancePtr);
-
- /* Initialize repeated start flag to 0 */
- InstancePtr->IsRepeatedStart = 0;
-
- return (s32)XST_SUCCESS;
-}
-
-/*****************************************************************************/
-/**
-* Check whether the I2C bus is busy
-*
-* @param InstancePtr is a pointer to the XIicPs instance.
-*
-* @return
-* - TRUE if the bus is busy.
-* - FALSE if the bus is not busy.
-*
-* @note None.
-*
-******************************************************************************/
-s32 XIicPs_BusIsBusy(XIicPs *InstancePtr)
-{
- u32 StatusReg;
- s32 Status;
-
- StatusReg = XIicPs_ReadReg(InstancePtr->Config.BaseAddress,
- XIICPS_SR_OFFSET);
- if ((StatusReg & XIICPS_SR_BA_MASK) != 0x0U) {
- Status = (s32)TRUE;
- }else {
- Status = (s32)FALSE;
- }
- return Status;
-}
-
-/*****************************************************************************/
-/**
-*
-* This is a stub for the status callback. The stub is here in case the upper
-* layers forget to set the handler.
-*
-* @param CallBackRef is a pointer to the upper layer callback reference.
-* @param StatusEvent is the event that just occurred.
-* @param ByteCount is the number of bytes transferred up until the event
-* occurred.
-*
-* @return None.
-*
-* @note None.
-*
-******************************************************************************/
-static void StubHandler(void *CallBackRef, u32 StatusEvent)
-{
- (void) ((void *)CallBackRef);
- (void) StatusEvent;
- Xil_AssertVoidAlways();
-}
-
-
-/*****************************************************************************/
-/**
-*
-* Aborts a transfer in progress by resetting the FIFOs. The byte counts are
-* cleared.
-*
-* @param InstancePtr is a pointer to the XIicPs instance.
-*
-* @return None.
-*
-* @note None.
-*
-******************************************************************************/
-void XIicPs_Abort(XIicPs *InstancePtr)
-{
- u32 IntrMaskReg;
- u32 IntrStatusReg;
-
- Xil_AssertVoid(InstancePtr != NULL);
- Xil_AssertVoid(InstancePtr->IsReady == (u32)XIL_COMPONENT_IS_READY);
-
- /*
- * Enter a critical section, so disable the interrupts while we clear
- * the FIFO and the status register.
- */
- IntrMaskReg = XIicPs_ReadReg(InstancePtr->Config.BaseAddress,
- XIICPS_IMR_OFFSET);
- XIicPs_WriteReg(InstancePtr->Config.BaseAddress,
- XIICPS_IDR_OFFSET, XIICPS_IXR_ALL_INTR_MASK);
-
- /*
- * Reset the settings in config register and clear the FIFOs.
- */
- XIicPs_WriteReg(InstancePtr->Config.BaseAddress, XIICPS_CR_OFFSET,
- XIICPS_CR_RESET_VALUE | XIICPS_CR_CLR_FIFO_MASK);
-
- /*
- * Read, then write the interrupt status to make sure there are no
- * pending interrupts.
- */
- IntrStatusReg = XIicPs_ReadReg(InstancePtr->Config.BaseAddress,
- XIICPS_ISR_OFFSET);
- XIicPs_WriteReg(InstancePtr->Config.BaseAddress,
- XIICPS_ISR_OFFSET, IntrStatusReg);
-
- /*
- * Restore the interrupt state.
- */
- IntrMaskReg = XIICPS_IXR_ALL_INTR_MASK & (~IntrMaskReg);
- XIicPs_WriteReg(InstancePtr->Config.BaseAddress,
- XIICPS_IER_OFFSET, IntrMaskReg);
-
-}
-
-/*****************************************************************************/
-/**
-*
-* Resets the IIC device. Reset must only be called after the driver has been
-* initialized. The configuration of the device after reset is the same as its
-* configuration after initialization. Any data transfer that is in progress is
-* aborted.
-*
-* The upper layer software is responsible for re-configuring (if necessary)
-* and reenabling interrupts for the IIC device after the reset.
-*
-* @param InstancePtr is a pointer to the XIicPs instance.
-*
-* @return None.
-*
-* @note None.
-*
-******************************************************************************/
-void XIicPs_Reset(XIicPs *InstancePtr)
-{
-
- Xil_AssertVoid(InstancePtr != NULL);
- Xil_AssertVoid(InstancePtr->IsReady == (u32)XIL_COMPONENT_IS_READY);
-
- /*
- * Abort any transfer that is in progress.
- */
- XIicPs_Abort(InstancePtr);
-
- /*
- * Reset any values so the software state matches the hardware device.
- */
- XIicPs_WriteReg(InstancePtr->Config.BaseAddress, XIICPS_CR_OFFSET,
- XIICPS_CR_RESET_VALUE);
- XIicPs_WriteReg(InstancePtr->Config.BaseAddress,
- XIICPS_TIME_OUT_OFFSET, XIICPS_TO_RESET_VALUE);
- XIicPs_WriteReg(InstancePtr->Config.BaseAddress, XIICPS_IDR_OFFSET,
- XIICPS_IXR_ALL_INTR_MASK);
-
-}
-/*****************************************************************************/
-/**
-* Put more data into the transmit FIFO, number of bytes is ether expected
-* number of bytes for this transfer or available space in FIFO, which ever
-* is less.
-*
-* @param InstancePtr is a pointer to the XIicPs instance.
-*
-* @return Number of bytes left for this instance.
-*
-* @note This is function is shared by master and slave.
-*
-******************************************************************************/
-s32 TransmitFifoFill(XIicPs *InstancePtr)
-{
- u8 AvailBytes;
- s32 LoopCnt;
- s32 NumBytesToSend;
-
- /*
- * Determine number of bytes to write to FIFO.
- */
- AvailBytes = (u8)XIICPS_FIFO_DEPTH -
- (u8)XIicPs_ReadReg(InstancePtr->Config.BaseAddress,
- XIICPS_TRANS_SIZE_OFFSET);
-
- if (InstancePtr->SendByteCount > (s32)AvailBytes) {
- NumBytesToSend = (s32)AvailBytes;
- } else {
- NumBytesToSend = InstancePtr->SendByteCount;
- }
-
- /*
- * Fill FIFO with amount determined above.
- */
- for (LoopCnt = 0; LoopCnt < NumBytesToSend; LoopCnt++) {
- XIicPs_SendByte(InstancePtr);
- }
-
- return InstancePtr->SendByteCount;
-}
-/** @} */
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