Intel 80310 I/O Processor Chipset AAU Coding Techniques

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Intel ® 80310 I/O Processor Chipset AAU Coding TechniquesExample Calling Source Codeu32 NDA; /* next descriptor address [READONLY] */u32 SAR[AAU_SAR_GROUP]; /* src addrs */u32 DAR; /* destination addr */u32 BC; /* byte count */u32 DC; /* descriptor control */u32 SARE[AAU_SAR_GROUP]; /* extended src addrs */} aau_desc_t;/* user SGL format */typedef struct _aau_sgl{aau_desc_t aau_desc; /* AAU HW Desc */u32 status; /* status of SGL [READONLY] */struct _aau_sgl*next; /* pointer to next SG [READONLY] */void *dest; /* destination addr */void *src[AAU_SAR_GROUP]; /* source addr[4] */void *ext_src[AAU_SAR_GROUP]; /* ext src addr[4] */u32 total_src; /* total number of source */} aau_sgl_t;/* header for user SGL */typedef struct _aau_head{u32 total; /* total descriptors allocated */u32 status; /* SGL status */aau_sgl_t *list; /* ptr to head of list */aau_callback_t callback; /* callback func ptr */} aau_head_t;The function will call aau_start() and start the AAU after it queuesthe SGL to the processing queue. When the function will eithera. Sleep on the wait queue aau->wait_q if no callback has been provided, orb. Continue and then call the provided callback function when DMA interrupt68 White Paper
Intel ® 80310 I/O Processor Chipset AAU Coding TechniquesExample Calling Source Codehas been triggered.int aau_suspend(u32 aau_context);Stops/Suspends the AAU operationint aau_free(u32 aau_context);Frees the ownership of AAU. Called when no longer need AAU service.aau_sgl_t * aau_get_buffer(u32 aau_context, int num_buf);This function obtains an AAU SGL for the user. User must specify the numberof descriptors to be allocated in the chain that is returned.void aau_return_buffer(u32 aau_context, aau_sgl_t *list);This function returns all SGL back to the API after user is done.int aau_memcpy(void *dest, void *src, u32 size);This function is a short cut for user to do memory copy utilizing the AAU forbetter large block memory copy vs. using the CPU. This is similar to usingtypical memcopy() call.* User is responsible for the source address(es) and the destination address.The source and destination should all be cached memory.void aau_test(){u32 aau;char dev_id[] = "AAU";int size = 2;int err = 0;aau_head_t *head;aau_sgl_t *list;u32 i;White Paper 69
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