linux-kernel - [PATCH 4/7] arm64: dts: ti: k3-j721e-main: switch to 64-bit address space for PCIe0 and PCIe1

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Message-ID: <20250417120407.2646929-5-s-vadapalli@ti.com>
Date: Thu, 17 Apr 2025 17:34:04 +0530
From: Siddharth Vadapalli <s-vadapalli@...com>
To: <nm@...com>, <vigneshr@...com>, <kristo@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <srk@...com>,
        <s-vadapalli@...com>
Subject: [PATCH 4/7] arm64: dts: ti: k3-j721e-main: switch to 64-bit address space for PCIe0 and PCIe1

The PCIe0 and PCIe1 instances of PCIe in J721E SoC support:
1. 128 MB address region in the 32-bit address space
2. 4 GB address region in the 64-bit address space

The default configuration is that of a 128 MB address region in the
32-bit address space. While this might be sufficient for most use-cases,
it is insufficient for supporting use-cases which require larger address
spaces. Therefore, switch to using the 64-bit address space with a 4 GB
address region.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
---
 arch/arm64/boot/dts/ti/k3-j721e-main.dtsi | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi b/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi
index af3d730154ac..8bd5cf26fc42 100644
--- a/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-j721e-main.dtsi
@@ -941,7 +941,7 @@ pcie0_rc: pcie@...0000 {
 		reg = <0x00 0x02900000 0x00 0x1000>,
 		      <0x00 0x02907000 0x00 0x400>,
 		      <0x00 0x0d000000 0x00 0x00800000>,
-		      <0x00 0x10000000 0x00 0x00001000>;
+		      <0x40 0x00000000 0x00 0x00001000>;
 		reg-names = "intd_cfg", "user_cfg", "reg", "cfg";
 		interrupt-names = "link_state";
 		interrupts = <GIC_SPI 318 IRQ_TYPE_EDGE_RISING>;
@@ -959,8 +959,9 @@ pcie0_rc: pcie@...0000 {
 		device-id = <0xb00d>;
 		msi-map = <0x0 &gic_its 0x0 0x10000>;
 		dma-coherent;
-		ranges = <0x01000000 0x0 0x10001000 0x0 0x10001000 0x0 0x0010000>,
-			 <0x02000000 0x0 0x10011000 0x0 0x10011000 0x0 0x7fef000>;
+		ranges = <0x01000000 0x00 0x00001000 0x40 0x00001000 0x00 0x00100000>, /* IO (1 MB) */
+			 <0x02000000 0x00 0x00101000 0x40 0x00101000 0x00 0x08000000>, /* 32-bit Non-Prefetchable MEM (128 MB) */
+			 <0x43000000 0x40 0x08101000 0x40 0x08101000 0x00 0xf7eff000>; /* 64-bit Prefetchable MEM (4 GB - (129 MB + 4 KB)) */
 		dma-ranges = <0x02000000 0x0 0x0 0x0 0x0 0x10000 0x0>;
 		status = "disabled";
 	};
@@ -970,7 +971,7 @@ pcie1_rc: pcie@...0000 {
 		reg = <0x00 0x02910000 0x00 0x1000>,
 		      <0x00 0x02917000 0x00 0x400>,
 		      <0x00 0x0d800000 0x00 0x00800000>,
-		      <0x00 0x18000000 0x00 0x00001000>;
+		      <0x41 0x00000000 0x00 0x00001000>;
 		reg-names = "intd_cfg", "user_cfg", "reg", "cfg";
 		interrupt-names = "link_state";
 		interrupts = <GIC_SPI 330 IRQ_TYPE_EDGE_RISING>;
@@ -988,8 +989,9 @@ pcie1_rc: pcie@...0000 {
 		device-id = <0xb00d>;
 		msi-map = <0x0 &gic_its 0x10000 0x10000>;
 		dma-coherent;
-		ranges = <0x01000000 0x0 0x18001000 0x0 0x18001000 0x0 0x0010000>,
-			 <0x02000000 0x0 0x18011000 0x0 0x18011000 0x0 0x7fef000>;
+		ranges = <0x01000000 0x00 0x00001000 0x41 0x00001000 0x00 0x00100000>, /* IO (1 MB) */
+			 <0x02000000 0x00 0x00101000 0x41 0x00101000 0x00 0x08000000>, /* 32-bit Non-Prefetchable MEM (128 MB) */
+			 <0x43000000 0x41 0x08101000 0x41 0x08101000 0x00 0xf7eff000>; /* 64-bit Prefetchable MEM (4 GB - (129 MB + 4 KB)) */
 		dma-ranges = <0x02000000 0x0 0x0 0x0 0x0 0x10000 0x0>;
 		status = "disabled";
 	};
-- 
2.34.1