[PATCH 1/2] board: ti: am62ax: tifs-rm-cfg/rm-cfg: Update DMA resource sharing for CPSW

Siddharth Vadapalli
2026-02-24T12:04:50Z

The CPSW3G instance of CPSW on AM62AX SoC provides Ethernet functionality.
Currently, Ethernet is supported on Linux which runs on the A53 core on the
SoC, by allocating all of the DMA resources associated with CPSW to A53_2.

In order to enable use-cases where the Ethernet traffic is sent from or
consumed by various CPU cores on the SoC simultaneously, while at the
same time, maintaining backward compatibility with the existing use-case
of A53 being the sole entity that exchanges traffic with CPSW via DMA,
update the DMA resource sharing scheme on AM62AX SoC to the following:

--------------- -------------- ------------- ----------------
Resource WKUP_R5 MCU_R5 A53_2
--------------- -------------- ------------- ----------------
TX Channels [8] => 4 (Primary) 4 (Primary) 8 (Secondary)
TX Rings [64] => 32 (Primary) 32 (Primary) 64 (Secondary)
RX Channels [1] => 1 (Primary) 0 1 (Secondary)
RX Flows [16] => 6 (Primary) 10 (Primary) 16 (Secondary)

In the absence of primary owners of resources (existing use-case
where A53 owns all of the CPSW DMA resources), the secondary owner
can claim all of the resources as its own. For shared use-cases,
the resources that are not claimed by the primary are communicated
to the secondary owner allowing it to claim them. This ensures that
Linux on A53_2 can continue claiming all DMA resources associated
with CPSW in the absence of primary owners, while at the same time
providing users the flexibility to share CPSW DMA resources across
various CPU cores listed above if needed.

While Linux has been mentioned as the Operating System running
on A53, there is no dependency between the Operating System
running on A53 and its ability to claim the CPSW DMA resources
listed above.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
---
board/ti/am62ax/rm-cfg.yaml | 74 ++++++++++++++++----
board/ti/am62ax/tifs-rm-cfg.yaml | 112 +++++++++++++++++++++++--------
2 files changed, 144 insertions(+), 42 deletions(-)

diff --git a/board/ti/am62ax/rm-cfg.yaml b/board/ti/am62ax/rm-cfg.yaml
index cbd087de797..89e1c49a2af 100644
--- a/board/ti/am62ax/rm-cfg.yaml
+++ b/board/ti/am62ax/rm-cfg.yaml
@@ -1,5 +1,5 @@
# SPDX-License-Identifier: GPL-2.0+
-# Copyright (C) 2022-2024 Texas Instruments Incorporated - https://www.ti.com/
+# Copyright (C) 2022-2026 Texas Instruments Incorporated - https://www.ti.com/
#
# Resource management configuration for AM62A
#
@@ -16,14 +16,14 @@ rm-cfg:
magic: 0x4C41
size: 356
host_cfg_entries:
- - # 1
+ - # 1
host_id: 12
allowed_atype: 0x2A
allowed_qos: 0xAAAA
allowed_orderid: 0xAAAAAAAA
allowed_priority: 0xAAAA
allowed_sched_priority: 0xAA
- - # 2
+ - # 2
host_id: 20
allowed_atype: 0x2A
allowed_qos: 0xAAAA
@@ -244,7 +244,7 @@ rm-cfg:
subhdr:
magic: 0x7B25
size: 8
- resasg_entries_size: 1064
+ resasg_entries_size: 1128
reserved: 0
resasg_entries:
-
@@ -705,13 +705,25 @@ rm-cfg:
reserved: 0
-
start_resource: 19
- num_resource: 64
+ num_resource: 32
type: 1937
host_id: 12
reserved: 0
-
start_resource: 19
- num_resource: 64
+ num_resource: 32
+ type: 1937
+ host_id: 36
+ reserved: 0
+ -
+ start_resource: 51
+ num_resource: 32
+ type: 1937
+ host_id: 12
+ reserved: 0
+ -
+ start_resource: 51
+ num_resource: 32
type: 1937
host_id: 30
reserved: 0
@@ -759,13 +771,25 @@ rm-cfg:
reserved: 0
-
start_resource: 118
- num_resource: 16
+ num_resource: 6
type: 1943
host_id: 12
reserved: 0
-
start_resource: 118
- num_resource: 16
+ num_resource: 6
+ type: 1943
+ host_id: 36
+ reserved: 0
+ -
+ start_resource: 124
+ num_resource: 10
+ type: 1943
+ host_id: 12
+ reserved: 0
+ -
+ start_resource: 124
+ num_resource: 10
type: 1943
host_id: 30
reserved: 0
@@ -825,13 +849,25 @@ rm-cfg:
reserved: 0
-
start_resource: 19
- num_resource: 8
+ num_resource: 4
type: 1956
host_id: 12
reserved: 0
-
start_resource: 19
- num_resource: 8
+ num_resource: 4
+ type: 1956
+ host_id: 36
+ reserved: 0
+ -
+ start_resource: 23
+ num_resource: 4
+ type: 1956
+ host_id: 12
+ reserved: 0
+ -
+ start_resource: 23
+ num_resource: 4
type: 1956
host_id: 30
reserved: 0
@@ -917,17 +953,29 @@ rm-cfg:
start_resource: 19
num_resource: 1
type: 1963
- host_id: 30
+ host_id: 36
reserved: 0
-
start_resource: 19
- num_resource: 16
+ num_resource: 6
type: 1964
host_id: 12
reserved: 0
-
start_resource: 19
- num_resource: 16
+ num_resource: 6
+ type: 1964
+ host_id: 36
+ reserved: 0
+ -
+ start_resource: 25
+ num_resource: 10
+ type: 1964
+ host_id: 12
+ reserved: 0
+ -
+ start_resource: 25
+ num_resource: 10
type: 1964
host_id: 30
reserved: 0
diff --git a/board/ti/am62ax/tifs-rm-cfg.yaml b/board/ti/am62ax/tifs-rm-cfg.yaml
index 151cd599b1b..fcb057dbdac 100644
--- a/board/ti/am62ax/tifs-rm-cfg.yaml
+++ b/board/ti/am62ax/tifs-rm-cfg.yaml
@@ -1,7 +1,7 @@
# SPDX-License-Identifier: GPL-2.0+
-# Copyright (C) 2022-2023 Texas Instruments Incorporated - https://www.ti.com/
+# Copyright (C) 2022-2026 Texas Instruments Incorporated - https://www.ti.com/
#
-# Resource management configuration for AM62AX
+# Resource management configuration for AM62A
#

---
@@ -24,26 +24,26 @@ tifs-rm-cfg:
allowed_priority: 0xAAAA
allowed_sched_priority: 0xAA
- # 2
- host_id: 30
+ host_id: 20
allowed_atype: 0x2A
allowed_qos: 0xAAAA
allowed_orderid: 0xAAAAAAAA
allowed_priority: 0xAAAA
allowed_sched_priority: 0xAA
- # 3
- host_id: 36
+ host_id: 30
allowed_atype: 0x2A
allowed_qos: 0xAAAA
allowed_orderid: 0xAAAAAAAA
allowed_priority: 0xAAAA
allowed_sched_priority: 0xAA
- # 4
- host_id: 0
- allowed_atype: 0
- allowed_qos: 0
- allowed_orderid: 0
- allowed_priority: 0
- allowed_sched_priority: 0
+ host_id: 36
+ allowed_atype: 0x2A
+ allowed_qos: 0xAAAA
+ allowed_orderid: 0xAAAAAAAA
+ allowed_priority: 0xAAAA
+ allowed_sched_priority: 0xAA
- # 5
host_id: 0
allowed_atype: 0
@@ -244,7 +244,7 @@ tifs-rm-cfg:
subhdr:
magic: 0x7B25
size: 8
- resasg_entries_size: 872
+ resasg_entries_size: 944
reserved: 0
resasg_entries:
-
@@ -257,7 +257,7 @@ tifs-rm-cfg:
start_resource: 18
num_resource: 6
type: 1677
- host_id: 35
+ host_id: 20
reserved: 0
-
start_resource: 18
@@ -287,7 +287,7 @@ tifs-rm-cfg:
start_resource: 72
num_resource: 6
type: 1678
- host_id: 35
+ host_id: 20
reserved: 0
-
start_resource: 72
@@ -317,7 +317,7 @@ tifs-rm-cfg:
start_resource: 44
num_resource: 6
type: 1679
- host_id: 35
+ host_id: 20
reserved: 0
-
start_resource: 44
@@ -347,7 +347,7 @@ tifs-rm-cfg:
start_resource: 18
num_resource: 6
type: 1696
- host_id: 35
+ host_id: 20
reserved: 0
-
start_resource: 18
@@ -377,7 +377,7 @@ tifs-rm-cfg:
start_resource: 18
num_resource: 6
type: 1697
- host_id: 35
+ host_id: 20
reserved: 0
-
start_resource: 18
@@ -407,7 +407,7 @@ tifs-rm-cfg:
start_resource: 12
num_resource: 6
type: 1698
- host_id: 35
+ host_id: 20
reserved: 0
-
start_resource: 12
@@ -429,19 +429,25 @@ tifs-rm-cfg:
reserved: 0
-
start_resource: 6
- num_resource: 34
+ num_resource: 26
type: 1802
host_id: 12
reserved: 0
+ -
+ start_resource: 32
+ num_resource: 8
+ type: 1802
+ host_id: 20
+ reserved: 0
-
start_resource: 44
- num_resource: 36
+ num_resource: 35
type: 1802
host_id: 35
reserved: 0
-
start_resource: 44
- num_resource: 36
+ num_resource: 35
type: 1802
host_id: 36
reserved: 0
@@ -579,13 +585,25 @@ tifs-rm-cfg:
reserved: 0
-
start_resource: 19
- num_resource: 64
+ num_resource: 32
type: 1937
host_id: 12
reserved: 0
-
start_resource: 19
- num_resource: 64
+ num_resource: 32
+ type: 1937
+ host_id: 36
+ reserved: 0
+ -
+ start_resource: 51
+ num_resource: 32
+ type: 1937
+ host_id: 12
+ reserved: 0
+ -
+ start_resource: 51
+ num_resource: 32
type: 1937
host_id: 30
reserved: 0
@@ -633,13 +651,25 @@ tifs-rm-cfg:
reserved: 0
-
start_resource: 118
- num_resource: 16
+ num_resource: 6
type: 1943
host_id: 12
reserved: 0
-
start_resource: 118
- num_resource: 16
+ num_resource: 6
+ type: 1943
+ host_id: 36
+ reserved: 0
+ -
+ start_resource: 124
+ num_resource: 10
+ type: 1943
+ host_id: 12
+ reserved: 0
+ -
+ start_resource: 124
+ num_resource: 10
type: 1943
host_id: 30
reserved: 0
@@ -699,13 +729,25 @@ tifs-rm-cfg:
reserved: 0
-
start_resource: 19
- num_resource: 8
+ num_resource: 4
type: 1956
host_id: 12
reserved: 0
-
start_resource: 19
- num_resource: 8
+ num_resource: 4
+ type: 1956
+ host_id: 36
+ reserved: 0
+ -
+ start_resource: 23
+ num_resource: 4
+ type: 1956
+ host_id: 12
+ reserved: 0
+ -
+ start_resource: 23
+ num_resource: 4
type: 1956
host_id: 30
reserved: 0
@@ -791,17 +833,29 @@ tifs-rm-cfg:
start_resource: 19
num_resource: 1
type: 1963
- host_id: 30
+ host_id: 36
reserved: 0
-
start_resource: 19
- num_resource: 16
+ num_resource: 6
type: 1964
host_id: 12
reserved: 0
-
start_resource: 19
- num_resource: 16
+ num_resource: 6
+ type: 1964
+ host_id: 36
+ reserved: 0
+ -
+ start_resource: 25
+ num_resource: 10
+ type: 1964
+ host_id: 12
+ reserved: 0
+ -
+ start_resource: 25
+ num_resource: 10
type: 1964
host_id: 30
reserved: 0
--
2.51.1