2c8f92039d
Added initial support Xilinx Embedded Software. Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
255 lines
9.7 KiB
C
Executable file
255 lines
9.7 KiB
C
Executable file
/******************************************************************************
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*
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* Copyright (C) 2002 - 2014 Xilinx, Inc. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* Use of the Software is limited solely to applications:
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* (a) running on a Xilinx device, or
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* (b) that interact with a Xilinx device through a bus or interconnect.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* XILINX CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Except as contained in this notice, the name of the Xilinx shall not be used
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* in advertising or otherwise to promote the sale, use or other dealings in
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* this Software without prior written authorization from Xilinx.
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*
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******************************************************************************/
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/*****************************************************************************/
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/**
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* @file xgpio.c
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*
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* The implementation of the XGpio driver's basic functionality. See xgpio.h
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* for more information about the driver.
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*
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* @note
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*
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* None
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*
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* <pre>
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* MODIFICATION HISTORY:
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*
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* Ver Who Date Changes
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* ----- ---- -------- -----------------------------------------------
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* 1.00a rmm 02/04/02 First release
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* 2.00a jhl 12/16/02 Update for dual channel and interrupt support
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* 2.01a jvb 12/13/05 Changed Initialize() into CfgInitialize(), and made
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* CfgInitialize() take a pointer to a config structure
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* instead of a device id. Moved Initialize() into
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* xgpio_sinit.c, and had Initialize() call CfgInitialize()
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* after it retrieved the config structure using the device
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* id. Removed include of xparameters.h along with any
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* dependencies on xparameters.h and the _g.c config table.
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* 2.11a mta 03/21/07 Updated to new coding style, added GetDataDirection
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* 2.12a sv 11/21/07 Updated driver to support access through DCR bus
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* 3.00a sv 11/21/09 Updated to use HAL Processor APIs. Renamed the
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* macros to remove _m from the name.
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* </pre>
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*
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*****************************************************************************/
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/***************************** Include Files ********************************/
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#include "xgpio.h"
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#include "xstatus.h"
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/************************** Constant Definitions ****************************/
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/**************************** Type Definitions ******************************/
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/***************** Macros (Inline Functions) Definitions ********************/
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/************************** Variable Definitions ****************************/
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/************************** Function Prototypes *****************************/
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/****************************************************************************/
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/**
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* Initialize the XGpio instance provided by the caller based on the
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* given configuration data.
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*
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* Nothing is done except to initialize the InstancePtr.
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*
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* @param InstancePtr is a pointer to an XGpio instance. The memory the
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* pointer references must be pre-allocated by the caller. Further
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* calls to manipulate the driver through the XGpio API must be
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* made with this pointer.
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* @param Config is a reference to a structure containing information
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* about a specific GPIO device. This function initializes an
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* InstancePtr object for a specific device specified by the
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* contents of Config. This function can initialize multiple
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* instance objects with the use of multiple calls giving different
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* Config information on each call.
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* @param EffectiveAddr is the device base address in the virtual memory
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* address space. The caller is responsible for keeping the address
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* mapping from EffectiveAddr to the device physical base address
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* unchanged once this function is invoked. Unexpected errors may
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* occur if the address mapping changes after this function is
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* called. If address translation is not used, use
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* Config->BaseAddress for this parameters, passing the physical
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* address instead.
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*
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* @return
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* - XST_SUCCESS Initialization was successfull.
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*
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* @note None.
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*
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*****************************************************************************/
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int XGpio_CfgInitialize(XGpio * InstancePtr, XGpio_Config * Config,
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u32 EffectiveAddr)
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{
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/*
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* Assert arguments
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*/
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Xil_AssertNonvoid(InstancePtr != NULL);
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/*
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* Set some default values.
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*/
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#if (XPAR_XGPIO_USE_DCR_BRIDGE != 0)
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InstancePtr->BaseAddress = ((EffectiveAddr >> 2)) & 0xFFF;
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#else
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InstancePtr->BaseAddress = EffectiveAddr;
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#endif
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InstancePtr->InterruptPresent = Config->InterruptPresent;
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InstancePtr->IsDual = Config->IsDual;
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/*
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* Indicate the instance is now ready to use, initialized without error
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*/
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InstancePtr->IsReady = XIL_COMPONENT_IS_READY;
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return (XST_SUCCESS);
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}
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/****************************************************************************/
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/**
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* Set the input/output direction of all discrete signals for the specified
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* GPIO channel.
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*
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* @param InstancePtr is a pointer to an XGpio instance to be worked on.
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* @param Channel contains the channel of the GPIO (1 or 2) to operate on.
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* @param DirectionMask is a bitmask specifying which discretes are input
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* and which are output. Bits set to 0 are output and bits set to 1
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* are input.
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*
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* @return None.
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*
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* @note The hardware must be built for dual channels if this function
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* is used with any channel other than 1. If it is not, this
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* function will assert.
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*
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*****************************************************************************/
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void XGpio_SetDataDirection(XGpio * InstancePtr, unsigned Channel,
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u32 DirectionMask)
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{
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Xil_AssertVoid(InstancePtr != NULL);
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Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
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Xil_AssertVoid((Channel == 1) ||
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((Channel == 2) && (InstancePtr->IsDual == TRUE)));
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XGpio_WriteReg(InstancePtr->BaseAddress,
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((Channel - 1) * XGPIO_CHAN_OFFSET) + XGPIO_TRI_OFFSET,
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DirectionMask);
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}
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/****************************************************************************/
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/**
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* Get the input/output direction of all discrete signals for the specified
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* GPIO channel.
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*
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* @param InstancePtr is a pointer to an XGpio instance to be worked on.
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* @param Channel contains the channel of the GPIO (1 or 2) to operate on.
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*
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* @return Bitmask specifying which discretes are input and
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* which are output. Bits set to 0 are output and bits set to 1 are
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* input.
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*
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* @note
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*
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* The hardware must be built for dual channels if this function is used
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* with any channel other than 1. If it is not, this function will assert.
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*
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*****************************************************************************/
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u32 XGpio_GetDataDirection(XGpio *InstancePtr, unsigned Channel)
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{
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Xil_AssertNonvoid(InstancePtr != NULL);
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Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
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Xil_AssertNonvoid((Channel == 1) ||
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((Channel == 2) &&
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(InstancePtr->IsDual == TRUE)));
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return XGpio_ReadReg(InstancePtr->BaseAddress,
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((Channel - 1) * XGPIO_CHAN_OFFSET) + XGPIO_TRI_OFFSET);
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}
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/****************************************************************************/
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/**
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* Read state of discretes for the specified GPIO channnel.
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*
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* @param InstancePtr is a pointer to an XGpio instance to be worked on.
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* @param Channel contains the channel of the GPIO (1 or 2) to operate on.
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*
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* @return Current copy of the discretes register.
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*
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* @note The hardware must be built for dual channels if this function
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* is used with any channel other than 1. If it is not, this
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* function will assert.
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*
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*****************************************************************************/
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u32 XGpio_DiscreteRead(XGpio * InstancePtr, unsigned Channel)
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{
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Xil_AssertNonvoid(InstancePtr != NULL);
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Xil_AssertNonvoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
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Xil_AssertNonvoid((Channel == 1) ||
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((Channel == 2) && (InstancePtr->IsDual == TRUE)));
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return XGpio_ReadReg(InstancePtr->BaseAddress,
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((Channel - 1) * XGPIO_CHAN_OFFSET) +
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XGPIO_DATA_OFFSET);
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}
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/****************************************************************************/
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/**
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* Write to discretes register for the specified GPIO channel.
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*
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* @param InstancePtr is a pointer to an XGpio instance to be worked on.
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* @param Channel contains the channel of the GPIO (1 or 2) to operate on.
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* @param Data is the value to be written to the discretes register.
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*
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* @return None.
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*
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* @note The hardware must be built for dual channels if this function
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* is used with any channel other than 1. If it is not, this
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* function will assert. See also XGpio_DiscreteSet() and
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* XGpio_DiscreteClear().
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*
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*****************************************************************************/
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void XGpio_DiscreteWrite(XGpio * InstancePtr, unsigned Channel, u32 Data)
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{
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Xil_AssertVoid(InstancePtr != NULL);
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Xil_AssertVoid(InstancePtr->IsReady == XIL_COMPONENT_IS_READY);
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Xil_AssertVoid((Channel == 1) ||
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((Channel == 2) && (InstancePtr->IsDual == TRUE)));
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XGpio_WriteReg(InstancePtr->BaseAddress,
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((Channel - 1) * XGPIO_CHAN_OFFSET) + XGPIO_DATA_OFFSET,
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Data);
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}
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