diff mbox series

[U-Boot,12/40] arm64: zynqmp: Add SMMU support for SATA IP

Message ID 4fc49e8a5473d46a2b26566249af128d53baa862.1509970359.git.michal.simek@xilinx.com
State Accepted
Commit 110d06b2e35f7e7b7c36cd5cbc48ed9f09f15b9e
Delegated to: Michal Simek
Headers show
Series zynqmp: arm64: DT changes | expand

Commit Message

Michal Simek Nov. 6, 2017, 12:12 p.m. UTC 
From: Anurag Kumar Vulisha <anurag.kumar.vulisha@xilinx.com>

AXI master interface in CEVA AHCI controller requires two unique
Write/Read ID tags per port. This is because, ahci controller uses
different AXI ID[3:0] bits for identifying non-data transfers(like
reading descriptors, updating PRD tables, etc) and data transfers
(like sending/receiving FIS).To make SMMU work with SATA we need to
add correct SMMU stream id for SATA. SMMU stream id for SATA is
determined based on the AXI ID[1:0] as shown below

	SATA SMMU ID =  <TBU number>, 0011, 00, 00, AXI ID[1:0]
	Note: SATA in  ZynqMp uses TBU1 so TBU number = 0x1, so
	      SMMU ID = 001, 0011, 00, 00, AXI ID[1:0]

Since we have four different AXI ID[3:0] (2 for port0 & 2 for port1
as said above) we get four different SMMU stream id's combinations
for SATA. These AXI ID can be configured using PAXIC register.
In this patch we assumed the below AXI ID values

 Read ID/ Write ID for Non-Data Port0 transfers = 0
 Read ID/ Write ID for Data Port0 transfers = 1
 Read ID/ Write ID for Non-Data Port1 transfers = 2
 Read ID/ Write ID for Data Port1 transfers = 3

Based on the above values,SMMU stream ID's for SATA will be 0x4c0 &
0x4c1 for PORT0, 0x4c2 & 0x4c3 for PORT1. These values needed to be
added to iommus dts property. This patch does the same.

Signed-off-by: Anurag Kumar Vulisha <anuragku@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
---

 arch/arm/dts/zynqmp.dtsi | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/arch/arm/dts/zynqmp.dtsi b/arch/arm/dts/zynqmp.dtsi
index c1900e9c95c2..f2c0b5ebf9ab 100644
--- a/arch/arm/dts/zynqmp.dtsi
+++ b/arch/arm/dts/zynqmp.dtsi
@@ -796,6 +796,10 @@ 
 			interrupt-parent = <&gic>;
 			interrupts = <0 133 4>;
 			power-domains = <&pd_sata>;
+			#stream-id-cells = <4>;
+			iommus = <&smmu 0x4c0>, <&smmu 0x4c1>,
+				 <&smmu 0x4c2>, <&smmu 0x4c3>;
+			/* dma-coherent; */
 		};
 
 		sdhci0: sdhci@ff160000 {