[PATCH 2/2] board: ti: j722s: tifs-rm-cfg/rm-cfg: Update DMA resource sharing for CPSW

Siddharth Vadapalli
2026-02-24T12:05:01Z

The CPSW3G instance of CPSW on J722S 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 J722S SoC to the following:

--------------- -------------- ------------- ----------------
Resource MAIN_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/j722s/rm-cfg.yaml | 124 ++++++++++++++++++++------------
board/ti/j722s/tifs-rm-cfg.yaml | 104 ++++++++++++++++++---------
2 files changed, 147 insertions(+), 81 deletions(-)

diff --git a/board/ti/j722s/rm-cfg.yaml b/board/ti/j722s/rm-cfg.yaml
index 62730adf216..7fe21892055 100644
--- a/board/ti/j722s/rm-cfg.yaml
+++ b/board/ti/j722s/rm-cfg.yaml
@@ -1,5 +1,5 @@
# SPDX-License-Identifier: GPL-2.0+
-# Copyright (C) 2022-2025 Texas Instruments Incorporated - https://www.ti.com/
+# Copyright (C) 2022-2026 Texas Instruments Incorporated - https://www.ti.com/
#
# Resource management configuration for J722S
#
@@ -244,7 +244,7 @@ rm-cfg:
subhdr:
magic: 0x7B25
size: 8
- resasg_entries_size: 1184
+ resasg_entries_size: 1192
reserved: 0
resasg_entries:
-
@@ -717,15 +717,27 @@ 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
+ host_id: 38
+ 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
-
start_resource: 83
@@ -771,15 +783,27 @@ 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
+ host_id: 38
+ 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
-
start_resource: 134
@@ -837,15 +861,27 @@ 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
+ host_id: 38
+ 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
-
start_resource: 27
@@ -929,19 +965,31 @@ rm-cfg:
start_resource: 19
num_resource: 1
type: 1963
- host_id: 36
+ host_id: 38
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
+ host_id: 38
+ 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
-
start_resource: 20
@@ -1017,13 +1065,13 @@ rm-cfg:
reserved: 0
-
start_resource: 8
- num_resource: 32
+ num_resource: 12
type: 12750
host_id: 12
reserved: 0
-
- start_resource: 8
- num_resource: 32
+ start_resource: 20
+ num_resource: 20
type: 12750
host_id: 38
reserved: 0
@@ -1035,13 +1083,13 @@ rm-cfg:
reserved: 0
-
start_resource: 0
- num_resource: 32
+ num_resource: 12
type: 12769
host_id: 12
reserved: 0
-
- start_resource: 0
- num_resource: 32
+ start_resource: 12
+ num_resource: 20
type: 12769
host_id: 38
reserved: 0
@@ -1053,22 +1101,10 @@ rm-cfg:
reserved: 0
-
start_resource: 0
- num_resource: 2
+ num_resource: 8
type: 12810
host_id: 12
reserved: 0
- -
- start_resource: 2
- num_resource: 2
- type: 12810
- host_id: 20
- reserved: 0
- -
- start_resource: 4
- num_resource: 2
- type: 12810
- host_id: 22
- reserved: 0
-
start_resource: 22
num_resource: 18
@@ -1077,27 +1113,21 @@ rm-cfg:
reserved: 0
-
start_resource: 12288
- num_resource: 56
+ num_resource: 64
type: 12813
host_id: 12
reserved: 0
-
- start_resource: 12344
- num_resource: 48
- type: 12813
- host_id: 20
- reserved: 0
- -
- start_resource: 12392
- num_resource: 48
+ start_resource: 12352
+ num_resource: 64
type: 12813
- host_id: 22
+ host_id: 38
reserved: 0
-
- start_resource: 12440
- num_resource: 64
+ start_resource: 12416
+ num_resource: 88
type: 12813
- host_id: 38
+ host_id: 128
reserved: 0
-
start_resource: 1536
diff --git a/board/ti/j722s/tifs-rm-cfg.yaml b/board/ti/j722s/tifs-rm-cfg.yaml
index 7b2e58a89b3..a6b7a089e36 100644
--- a/board/ti/j722s/tifs-rm-cfg.yaml
+++ b/board/ti/j722s/tifs-rm-cfg.yaml
@@ -1,5 +1,5 @@
# SPDX-License-Identifier: GPL-2.0+
-# Copyright (C) 2022-2025 Texas Instruments Incorporated - https://www.ti.com/
+# Copyright (C) 2022-2026 Texas Instruments Incorporated - https://www.ti.com/
#
# Resource management configuration for J722S
#
@@ -244,7 +244,7 @@ tifs-rm-cfg:
subhdr:
magic: 0x7B25
size: 8
- resasg_entries_size: 992
+ resasg_entries_size: 1000
reserved: 0
resasg_entries:
-
@@ -609,15 +609,27 @@ 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
+ host_id: 38
+ 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
-
start_resource: 83
@@ -663,15 +675,27 @@ 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
+ host_id: 38
+ 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
-
start_resource: 134
@@ -729,15 +753,27 @@ 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
+ host_id: 38
+ 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
-
start_resource: 27
@@ -821,19 +857,31 @@ tifs-rm-cfg:
start_resource: 19
num_resource: 1
type: 1963
- host_id: 36
+ host_id: 38
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
+ host_id: 38
+ 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
-
start_resource: 20
@@ -897,13 +945,13 @@ tifs-rm-cfg:
reserved: 0
-
start_resource: 8
- num_resource: 32
+ num_resource: 12
type: 12750
host_id: 12
reserved: 0
-
- start_resource: 8
- num_resource: 32
+ start_resource: 20
+ num_resource: 20
type: 12750
host_id: 38
reserved: 0
@@ -915,13 +963,13 @@ tifs-rm-cfg:
reserved: 0
-
start_resource: 0
- num_resource: 32
+ num_resource: 12
type: 12769
host_id: 12
reserved: 0
-
- start_resource: 0
- num_resource: 32
+ start_resource: 12
+ num_resource: 20
type: 12769
host_id: 38
reserved: 0
@@ -933,22 +981,10 @@ tifs-rm-cfg:
reserved: 0
-
start_resource: 0
- num_resource: 2
+ num_resource: 8
type: 12810
host_id: 12
reserved: 0
- -
- start_resource: 2
- num_resource: 2
- type: 12810
- host_id: 20
- reserved: 0
- -
- start_resource: 4
- num_resource: 2
- type: 12810
- host_id: 22
- reserved: 0
-
start_resource: 22
num_resource: 18
--
2.51.1