Intel 80310 I/O Processor Chipset AAU Coding Techniques

Intel ® 80310 I/O Processor Chipset AAU Coding TechniquesLow-Level Design Document3.1.6.2.2 static int aau_start(iop310_aau_t *aau, sw_aau_t *aau_chain);Input:Output:aau – pointer to AAU device descriptoraau_chain – pointer to AAU descriptor chain to be sent to AAUSuccess/Error conditionPurpose: This function starts the AAU or appends an AAU chain and resumes the operation whena chain is being processed.Operation:• If AAU not active— Write AAU descriptor address to ANDAR— Set enable accelerator bit in ACR• Else— Link chain to last AAU list tail ANDAR— Flush cache for range of tail descriptor ANDAR— If channel no longer active• Set chain resume bit in ACR• Set last descriptor pointer in AAU device descriptor3.1.6.2.3 int aau_request(u32 *aau_context);Input:Output:aau_context – pass by reference AAU context. Written back by function.success -- OKfailed -- -EINVALPurpose: This function requests an interrupt for the AAU from the kernel and returns the AAUdescriptor to the driver application.Operation:• Register IRQ with kernel• Increment reference count of AAU• Return AAU device descriptor to user3.1.6.2.4 int aau_suspend(u32 aau_context);Input:Output:aau_context – AAU device contextSuccess/Error conditionPurpose: This function suspends the AAU operation. It calls aau_stop() to perform theoperation.Operation:• Unset bit in ACR that enables AAU operationWhite Paper 19