78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
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/*
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* Copyright (C) 2010 Apple Inc. All rights reserved.
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*
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* This document is the property of Apple Inc.
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* It is considered confidential and proprietary.
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*
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* This document may not be reproduced or transmitted in any form,
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* in whole or in part, without the express written permission of
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* Apple Inc.
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*/
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#ifndef __AE2_DMA_H__
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#define __AE2_DMA_H__
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typedef void * dma_object_t;
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/*
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* dma_object_t is an object that can be used to control a dma
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*/
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typedef enum {
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kDirectionNone = 0,
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kDirectionIn = 1,
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kDirectionOut = 2
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} DMADirection;
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typedef struct LLI
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{
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uint32_t source;
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uint32_t destination;
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struct LLI *next;
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uint32_t control;
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} DMALinkedListItem;
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typedef enum {
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kI2S_0 = 0,
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kI2S_1,
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kI2S_2,
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kI2S_3,
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kMCA_0,
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kMCA_1,
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kAudioDevice_Last
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} AudioDevice_Index;
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// create a dma object that will transfer to/from a buffer from/to a device, depending
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// on the direction.
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dma_object_t create_dma_object(void *buffer, AudioDevice_Index device, DMALinkedListItem *chain, DMADirection direction, size_t bytesToTransfer);
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void destroy_dma_object(dma_object_t dma);
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void setupInterruptHandler(dma_object_t dma, int_handler handler, void *arg);
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void setupErrorHandler(dma_object_t dma, int_handler handler, void *arg);
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typedef enum {
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kFrameError = 0,
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kRXOverrun,
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kRXUnderrun,
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kTXOverrun,
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kTXUnderrun,
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kError_last
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} Error_Index;
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static const char* const kErrorTypeStr[kError_last] = {
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"Frame_Error",
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"RX_Overrun",
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"RX_Underrun",
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"TX_Overrun",
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"TX_Underrun",
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};
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uint32_t getErrorCount(dma_object_t dma, Error_Index which);
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void startDMAObject(dma_object_t dma);
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void stopDMAObject(dma_object_t dma, bool immediate);
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#endif /* __AE2_DMA_H__ */
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