AM275X DMA Device Descriptions

Introduction

This chapter provides information on the DMA devices in the AM275X SoC. Some System Firmware TISCI messages take device specific inputs. This chapter provides information on the valid values for DMA TISCI message parameters.

DMA Device IDs

Some System Firmware TISCI message APIs require the DMA device ID be provided as part of the request. Based on AM275X Device IDs these are the valid DMA device IDs.

DMA Device Name	DMA Device ID
AM275X_DEV_DMASS0_BCDMA_0	26
AM275X_DEV_DMASS0_PKTDMA_0	30

DMA Channel and Flow Indices

This section describes valid DMA channel indexes for each DMA channel type. Receive flow index range type information is also described if applicable to the DMA being described.

Warning

Resources marked as reserved for use by TIFS cannot be assigned to a host within the RM Board Configuration resource assignment array. The RM Board Configuration is rejected if an overlap with a reserved resource is detected.

DMASS0_BCDMA_0

Tx Channel Type	Tx Channel Index Range
SPLIT_TR_TX_CHAN	0 to 47

Rx Channel Type	Rx Channel Index Range
SPLIT_TR_RX_CHAN	0 to 49

Block Copy Channel Type	Block Copy Channel (Offset) + Index Range
BLOCK_COPY_CHAN	0 to 23

Rx Flow Type	Rx Flow Index Range
BLOCK_COPY_CHAN	0 to 23
SPLIT_TR_TX_CHAN	24 to 71
SPLIT_TR_RX_CHAN	72 to 121

DMASS0_PKTDMA_0

Tx Channel Type	Tx Channel Index Range
UNMAPPED_TX_CHAN	0 to 26
CPSW_TX_CHAN	27 to 34
SAUL_TX_0_CHAN	35 to 35
SAUL_TX_1_CHAN	36 to 36

Rx Channel Type	Rx Channel Index Range
UNMAPPED_RX_CHAN	0 to 26
CPSW_RX_CHAN	27 to 27
SAUL_RX_0_CHAN	28 to 28
SAUL_RX_1_CHAN	29 to 29
SAUL_RX_2_CHAN	30 to 30
SAUL_RX_3_CHAN	31 to 31

Rx Flow Type	Rx Flow Index Range
UNMAPPED_TX_CHAN	0 to 26
CPSW_TX_CHAN	27 to 90
SAUL_TX_0_CHAN	91 to 98
SAUL_TX_1_CHAN	99 to 106
UNMAPPED_RX_CHAN	107 to 133
CPSW_RX_CHAN	134 to 149
SAUL_RX_0_CHAN	150 to 157
SAUL_RX_1_CHAN	150 to 157
SAUL_RX_2_CHAN	158 to 165
SAUL_RX_3_CHAN	158 to 165