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CSL DAT Adapter

CSL DAT Adapter. CSL 2.x DAT Reference Implementation on EDMA3 hardware using EDMA3 Low level driver. EDMA3 Resource Manager. DMA/ QDMA Channels. TCCs. PaRAMs. EDMA3 ISRs. EDMA3 Low Level Driver (LLD). EDMA3 Driver APIs EDMA3 Resource Manager. Framework Components. CSL/DAT.

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CSL DAT Adapter

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  1. CSL DAT Adapter CSL 2.x DAT Reference Implementation on EDMA3 hardware using EDMA3 Low level driver.

  2. EDMA3 Resource Manager DMA/ QDMA Channels TCCs PaRAMs EDMA3 ISRs EDMA3 Low Level Driver (LLD) • EDMA3 Driver APIs • EDMA3 Resource Manager Framework Components CSL/DAT PSP Drivers DMAN3 ACPY3 Internally calls EDMA3 Driver EDMA3 Driver EDMA3 Package

  3. EDMA3 LLD Package • OS independent package • Registering and un-registering of EDMA3 Interrupt Service Routines with the underlying OS is responsibility of user. • User expected to provide implementation for the following functions to correctly link an application with the EDMA3 LLD Package. • edma3OsProtectEntry, edma3OsProtectExit • Used to protect entry and exit into critical sections of code. • edma3OsSemGive, edma3OsSemTake • Used for proper sharing and management of EDMA3 resources among multiple users. • Demo application provides sample implementation of these functions on BIOS

  4. EDMA3 LLD Initialization • Creates the EDMA3 Driver Instance, associated with particular shadow region. • Takes region specific configuration information and a semaphore handle as argument • Returns handle to newly created instance. • Creates EDMA3 Driver Object associated with the hardware • HW specific configuration information passed as argument. EDMA3_DRV_create() OS specific SEM_create() call EDMA3_DRV_Handle EDMA3_DRV_open() 0 EDMA3_RM_create() EDMA3_RM_open() Initializes the global and shadow regions and programs EDMA3 H/W registers.

  5. EDMA3 LLD Sequence(Driver APIs) OS specific EDMA3 ISR registration call EDMA3_DRV_Handle • Specify the channel type, channel number, tcc, event queue and the callback function. EDMA3_DRV_requestChannel() 0 EDMA3_RM_allocResource() EDMA3_RM_allocResource() EDMA3_RM_registerTccCb() EDMA3_RM_mapEdmaChannel() EDMA3_RM_mapQdmaChannel() Allocates a channel, param set, and a tcc. Registers the callback function and enable interrupts. Binds channel to the param set.

  6. EDMA3 LLD Sequence (cont’d..) EDMA3_DRV_Handle EDMA3_DRV_setSrcParams() EDMA3_DRV_setDestParams() EDMA3_DRV_setSrcIndex() EDMA3_DRV_setDestIndex() Programs PaRAM Set EDMA3_DRV_setTransferParams() EDMA3_DRV_setOptField() EDMA3_DRV_setQdmaTrigWord() 0

  7. EDMA3 LLD Sequence (cont’d..) EDMA3_DRV_Handle EDMA3_DRV_setParam() EDMA3_DRV_clearErrorBits() • Mode of data transfer (event, manual, QDMA) passed as an argument along with the channel id. EDMA3_DRV_enableTransfer() 0 After transfer completes, callback function is called (if registered)

  8. EDMA3 LLD Sequence (cont’d..) EDMA3_DRV_Handle EDMA3_DRV_freeChannel() EDMA3_DRV_close() OS specific SEM_delete() and EDMA3 ISR un-registration calls EDMA3_DRV_delete() 0 EDMA3_RM_freeResource()… EDMA3_RM_freeResource()… EDMA3_RM_delete() EDMA3_RM_close() Resets the state of the RM Instance configuration. Unregisters interrupts if no other RM instance exists. Programs H/W registers

  9. CSL DAT • CSL DAT consists of a small set of convenience APIs to move data around using the EDMA hardware. • DAT_open, DAT_copy, DAT_copy2d, DAT_fill, DAT_wait, DAT_busy, DAT_close. • CSL 2.x DAT and 3.x DAT implementations had different behavior as the underlying EDMA hardware changed (EDMA2 to EDMA3) • DAT_copy, DAT_copy2d are non-blocking calls on DAT 2.x, and blocking calls on DAT 3.x.

  10. CSL DAT Adapter • CSL DAT wrapper OS independent. • CSL DAT adapter implements the CSL 2.x DAT on the EDMA3 hardware • Uses the CSL 2.x header files • Behavior of the new API implementation, similar to that on EDMA2 hardware • Uses the EDMA3 Low Level Driver Package (only the Driver API was required) • Adds two APIs DAT_EDMA3LLD_init () and DAT_EDMA3LLD_exit() to set up the EDMA3 LLD. • Users of the package need to implement 2 functions • _dat_critical_section_enter() and _dat_critical_section_exit() • Demo application provides sample implementation of these functions on BIOS

  11. CSL DAT adapter (cont’d) DAT_open DAT_open x x DAT_copy x DAT_copy DAT_copy x DAT_copy DAT_copy x DAT_copy DAT_copy DAT 2.x on EDMA2 (hardware queue depth 4 on DM642) DAT 3.x on EDMA3 (no hardware queue)

  12. CSL DAT adapter (cont’d) X DAT_open DAT_open x x DAT_copy x DAT_copy DAT_copy x DAT_copy DAT_copy x DAT_copy DAT_copy DAT 2.x on EDMA2 (hardware queue depth 4 on DM642) DAT 3.x on EDMA3 (no hardware queue)

  13. CSL DAT adapter (cont’d) DAT_open DAT_open x x DAT_copy x DAT_copy x numChannels = 6 DAT_copy x DAT_copy x DAT_copy x DAT_copy x DAT_copy DAT_copy DAT_copy DAT 2.x on EDMA2 (hardware queue depth 4 on DM642) DAT using CSL Adapter on EDMA3 (no hardware queue)

  14. See DAT adapter code with example

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