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Diffstat (limited to 'board/xilinx/common/xdma_channel.h')
| -rw-r--r-- | board/xilinx/common/xdma_channel.h | 291 |
1 files changed, 0 insertions, 291 deletions
diff --git a/board/xilinx/common/xdma_channel.h b/board/xilinx/common/xdma_channel.h deleted file mode 100644 index 4685982..0000000 --- a/board/xilinx/common/xdma_channel.h +++ /dev/null @@ -1,291 +0,0 @@ -/****************************************************************************** -* -* Author: Xilinx, Inc. -* -* -* This program is free software; you can redistribute it and/or modify it -* under the terms of the GNU General Public License as published by the -* Free Software Foundation; either version 2 of the License, or (at your -* option) any later version. -* -* -* XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS" AS A -* COURTESY TO YOU. BY PROVIDING THIS DESIGN, CODE, OR INFORMATION AS -* ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE, APPLICATION OR STANDARD, -* XILINX IS MAKING NO REPRESENTATION THAT THIS IMPLEMENTATION IS FREE -* FROM ANY CLAIMS OF INFRINGEMENT, AND YOU ARE RESPONSIBLE FOR OBTAINING -* ANY THIRD PARTY RIGHTS YOU MAY REQUIRE FOR YOUR IMPLEMENTATION. -* XILINX EXPRESSLY DISCLAIMS ANY WARRANTY WHATSOEVER WITH RESPECT TO -* THE ADEQUACY OF THE IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO ANY -* WARRANTIES OR REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE FROM -* CLAIMS OF INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY AND -* FITNESS FOR A PARTICULAR PURPOSE. -* -* -* Xilinx hardware products are not intended for use in life support -* appliances, devices, or systems. Use in such applications is -* expressly prohibited. -* -* -* (c) Copyright 2002-2004 Xilinx Inc. -* All rights reserved. -* -* -* You should have received a copy of the GNU General Public License along -* with this program; if not, write to the Free Software Foundation, Inc., -* 675 Mass Ave, Cambridge, MA 02139, USA. -* -* FILENAME: -* -* xdma_channel.h -* -* DESCRIPTION: -* -* This file contains the DMA channel component implementation. This component -* supports a distributed DMA design in which each device can have it's own -* dedicated DMA channel, as opposed to a centralized DMA design. -* A device which uses DMA typically contains two DMA channels, one for -* sending data and the other for receiving data. -* -* This component is designed to be used as a basic building block for -* designing a device driver. It provides registers accesses such that all -* DMA processing can be maintained easier, but the device driver designer -* must still understand all the details of the DMA channel. -* -* The DMA channel allows a CPU to minimize the CPU interaction required to move -* data between a memory and a device. The CPU requests the DMA channel to -* perform a DMA operation and typically continues performing other processing -* until the DMA operation completes. DMA could be considered a primitive form -* of multiprocessing such that caching and address translation can be an issue. -* -* Scatter Gather Operations -* -* The DMA channel may support scatter gather operations. A scatter gather -* operation automates the DMA channel such that multiple buffers can be -* sent or received with minimal software interaction with the hardware. Buffer -* descriptors, contained in the XBufDescriptor component, are used by the -* scatter gather operations of the DMA channel to describe the buffers to be -* processed. -* -* Scatter Gather List Operations -* -* A scatter gather list may be supported by each DMA channel. The scatter -* gather list allows buffer descriptors to be put into the list by a device -* driver which requires scatter gather. The hardware processes the buffer -* descriptors which are contained in the list and modifies the buffer -* descriptors to reflect the status of the DMA operations. The device driver -* is notified by interrupt that specific DMA events occur including scatter -* gather events. The device driver removes the completed buffer descriptors -* from the scatter gather list to evaluate the status of each DMA operation. -* -* The scatter gather list is created and buffer descriptors are inserted into -* the list. Buffer descriptors are never removed from the list after it's -* creation such that a put operation copies from a temporary buffer descriptor -* to a buffer descriptor in the list. Get operations don't copy from the list -* to a temporary, but return a pointer to the buffer descriptor in the list. -* A buffer descriptor in the list may be locked to prevent it from being -* overwritten by a put operation. This allows the device driver to get a -* descriptor from a scatter gather list and prevent it from being overwritten -* until the buffer associated with the buffer descriptor has been processed. -* -* Typical Scatter Gather Processing -* -* The following steps illustrate the typical processing to use the -* scatter gather features of a DMA channel. -* -* 1. Create a scatter gather list for the DMA channel which puts empty buffer -* descriptors into the list. -* 2. Create buffer descriptors which describe the buffers to be filled with -* receive data or the buffers which contain data to be sent. -* 3. Put buffer descriptors into the DMA channel scatter list such that scatter -* gather operations are requested. -* 4. Commit the buffer descriptors in the list such that they are ready to be -* used by the DMA channel hardware. -* 5. Start the scatter gather operations of the DMA channel. -* 6. Process any interrupts which occur as a result of the scatter gather -* operations or poll the DMA channel to determine the status. -* -* Interrupts -* -* Each DMA channel has the ability to generate an interrupt. This component -* does not perform processing for the interrupt as this processing is typically -* tightly coupled with the device which is using the DMA channel. It is the -* responsibility of the caller of DMA functions to manage the interrupt -* including connecting to the interrupt and enabling/disabling the interrupt. -* -* Critical Sections -* -* It is the responsibility of the device driver designer to use critical -* sections as necessary when calling functions of the DMA channel. This -* component does not use critical sections and it does access registers using -* read-modify-write operations. Calls to DMA functions from a main thread -* and from an interrupt context could produce unpredictable behavior such that -* the caller must provide the appropriate critical sections. -* -* Address Translation -* -* All addresses of data structures which are passed to DMA functions must -* be physical (real) addresses as opposed to logical (virtual) addresses. -* -* Caching -* -* The memory which is passed to the function which creates the scatter gather -* list must not be cached such that buffer descriptors are non-cached. This -* is necessary because the buffer descriptors are kept in a ring buffer and -* not directly accessible to the caller of DMA functions. -* -* The caller of DMA functions is responsible for ensuring that any data -* buffers which are passed to the DMA channel are cache-line aligned if -* necessary. -* -* The caller of DMA functions is responsible for ensuring that any data -* buffers which are passed to the DMA channel have been flushed from the cache. -* -* The caller of DMA functions is responsible for ensuring that the cache is -* invalidated prior to using any data buffers which are the result of a DMA -* operation. -* -* Memory Alignment -* -* The addresses of data buffers which are passed to DMA functions must be -* 32 bit word aligned since the DMA hardware performs 32 bit word transfers. -* -* Mutual Exclusion -* -* The functions of the DMA channel are not thread safe such that the caller -* of all DMA functions is responsible for ensuring mutual exclusion for a -* DMA channel. Mutual exclusion across multiple DMA channels is not -* necessary. -* -* NOTES: -* -* Many of the provided functions which are register accessors don't provide -* a lot of error detection. The caller is expected to understand the impact -* of a function call based upon the current state of the DMA channel. This -* is done to minimize the overhead in this component. -* -******************************************************************************/ - -#ifndef XDMA_CHANNEL_H /* prevent circular inclusions */ -#define XDMA_CHANNEL_H /* by using protection macros */ - -/***************************** Include Files *********************************/ - -#include "xdma_channel_i.h" /* constants shared with buffer descriptor */ -#include "xbasic_types.h" -#include "xstatus.h" -#include "xversion.h" -#include "xbuf_descriptor.h" - -/************************** Constant Definitions *****************************/ - -/* the following constants provide access to the bit fields of the DMA control - * register (DMACR) - */ -#define XDC_DMACR_SOURCE_INCR_MASK 0x80000000UL /* increment source address */ -#define XDC_DMACR_DEST_INCR_MASK 0x40000000UL /* increment dest address */ -#define XDC_DMACR_SOURCE_LOCAL_MASK 0x20000000UL /* local source address */ -#define XDC_DMACR_DEST_LOCAL_MASK 0x10000000UL /* local dest address */ -#define XDC_DMACR_SG_DISABLE_MASK 0x08000000UL /* scatter gather disable */ -#define XDC_DMACR_GEN_BD_INTR_MASK 0x04000000UL /* descriptor interrupt */ -#define XDC_DMACR_LAST_BD_MASK XDC_CONTROL_LAST_BD_MASK /* last buffer */ - /* descriptor */ - -/* the following constants provide access to the bit fields of the DMA status - * register (DMASR) - */ -#define XDC_DMASR_BUSY_MASK 0x80000000UL /* channel is busy */ -#define XDC_DMASR_BUS_ERROR_MASK 0x40000000UL /* bus error occurred */ -#define XDC_DMASR_BUS_TIMEOUT_MASK 0x20000000UL /* bus timeout occurred */ -#define XDC_DMASR_LAST_BD_MASK XDC_STATUS_LAST_BD_MASK /* last buffer */ - /* descriptor */ -#define XDC_DMASR_SG_BUSY_MASK 0x08000000UL /* scatter gather is busy */ - -/* the following constants provide access to the bit fields of the interrupt - * status register (ISR) and the interrupt enable register (IER), bit masks - * match for both registers such that they are named IXR - */ -#define XDC_IXR_DMA_DONE_MASK 0x1UL /* dma operation done */ -#define XDC_IXR_DMA_ERROR_MASK 0x2UL /* dma operation error */ -#define XDC_IXR_PKT_DONE_MASK 0x4UL /* packet done */ -#define XDC_IXR_PKT_THRESHOLD_MASK 0x8UL /* packet count threshold */ -#define XDC_IXR_PKT_WAIT_BOUND_MASK 0x10UL /* packet wait bound reached */ -#define XDC_IXR_SG_DISABLE_ACK_MASK 0x20UL /* scatter gather disable - acknowledge occurred */ -#define XDC_IXR_SG_END_MASK 0x40UL /* last buffer descriptor - disabled scatter gather */ -#define XDC_IXR_BD_MASK 0x80UL /* buffer descriptor done */ - -/**************************** Type Definitions *******************************/ - -/* - * the following structure contains data which is on a per instance basis - * for the XDmaChannel component - */ -typedef struct XDmaChannelTag { - XVersion Version; /* version of the driver */ - u32 RegBaseAddress; /* base address of registers */ - u32 IsReady; /* device is initialized and ready */ - - XBufDescriptor *PutPtr; /* keep track of where to put into list */ - XBufDescriptor *GetPtr; /* keep track of where to get from list */ - XBufDescriptor *CommitPtr; /* keep track of where to commit in list */ - XBufDescriptor *LastPtr; /* keep track of the last put in the list */ - u32 TotalDescriptorCount; /* total # of descriptors in the list */ - u32 ActiveDescriptorCount; /* # of descriptors pointing to buffers - * in the buffer descriptor list */ -} XDmaChannel; - -/***************** Macros (Inline Functions) Definitions *********************/ - -/************************** Function Prototypes ******************************/ - -XStatus XDmaChannel_Initialize(XDmaChannel * InstancePtr, u32 BaseAddress); -u32 XDmaChannel_IsReady(XDmaChannel * InstancePtr); -XVersion *XDmaChannel_GetVersion(XDmaChannel * InstancePtr); -XStatus XDmaChannel_SelfTest(XDmaChannel * InstancePtr); -void XDmaChannel_Reset(XDmaChannel * InstancePtr); - -/* Control functions */ - -u32 XDmaChannel_GetControl(XDmaChannel * InstancePtr); -void XDmaChannel_SetControl(XDmaChannel * InstancePtr, u32 Control); - -/* Status functions */ - -u32 XDmaChannel_GetStatus(XDmaChannel * InstancePtr); -void XDmaChannel_SetIntrStatus(XDmaChannel * InstancePtr, u32 Status); -u32 XDmaChannel_GetIntrStatus(XDmaChannel * InstancePtr); -void XDmaChannel_SetIntrEnable(XDmaChannel * InstancePtr, u32 Enable); -u32 XDmaChannel_GetIntrEnable(XDmaChannel * InstancePtr); - -/* DMA without scatter gather functions */ - -void XDmaChannel_Transfer(XDmaChannel * InstancePtr, - u32 * SourcePtr, u32 * DestinationPtr, u32 ByteCount); - -/* Scatter gather functions */ - -XStatus XDmaChannel_SgStart(XDmaChannel * InstancePtr); -XStatus XDmaChannel_SgStop(XDmaChannel * InstancePtr, - XBufDescriptor ** BufDescriptorPtr); -XStatus XDmaChannel_CreateSgList(XDmaChannel * InstancePtr, - u32 * MemoryPtr, u32 ByteCount); -u32 XDmaChannel_IsSgListEmpty(XDmaChannel * InstancePtr); - -XStatus XDmaChannel_PutDescriptor(XDmaChannel * InstancePtr, - XBufDescriptor * BufDescriptorPtr); -XStatus XDmaChannel_CommitPuts(XDmaChannel * InstancePtr); -XStatus XDmaChannel_GetDescriptor(XDmaChannel * InstancePtr, - XBufDescriptor ** BufDescriptorPtr); - -/* Packet functions for interrupt collescing */ - -u32 XDmaChannel_GetPktCount(XDmaChannel * InstancePtr); -void XDmaChannel_DecrementPktCount(XDmaChannel * InstancePtr); -XStatus XDmaChannel_SetPktThreshold(XDmaChannel * InstancePtr, u8 Threshold); -u8 XDmaChannel_GetPktThreshold(XDmaChannel * InstancePtr); -void XDmaChannel_SetPktWaitBound(XDmaChannel * InstancePtr, u32 WaitBound); -u32 XDmaChannel_GetPktWaitBound(XDmaChannel * InstancePtr); - -#endif /* end of protection macro */ |