linux-kernel - [PATCH v2 1/7] arm64: dts: ti: k3-am64-main: switch to 64-bit address space for PCIe0

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Message-ID: <20250422120042.3746004-2-s-vadapalli@ti.com>
Date: Tue, 22 Apr 2025 17:30:36 +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>, <u-kumar1@...com>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <srk@...com>,
        <s-vadapalli@...com>
Subject: [PATCH v2 1/7] arm64: dts: ti: k3-am64-main: switch to 64-bit address space for PCIe0

The PCIe0 instance of PCIe in AM64 SoC supports:
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>
---

Link to v1 patch:
https://lore.kernel.org/r/20250417120407.2646929-2-s-vadapalli@ti.com/
Changes since v1:
- Based on Udit's feedback and offline discussion as described at:
  https://lore.kernel.org/r/7f6ea98c-df6d-4c94-8f42-76cc8306b6c4@ti.com/
  the address region of 4 GB is split as:
  0. 4 KB ECAM
  1. 1 MB IO
  2. (4 GB - 1 MB - 4 KB) 32-bit Non-Prefetchable MEM
  instead of the previous split of:
  0. 4 KB ECAM
  1. 1 MB IO
  2. 128 MB 32-bit Non-Prefetchable MEM
  3. (4 GB - 129 MB - 4 KB) 64-bit Prefetchable MEM

Regards,
Siddharth.

 arch/arm64/boot/dts/ti/k3-am64-main.dtsi | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
index 324eb44c258d..a22295ab4f9e 100644
--- a/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am64-main.dtsi
@@ -1031,7 +1031,7 @@ pcie0_rc: pcie@...2000 {
 		reg = <0x00 0x0f102000 0x00 0x1000>,
 		      <0x00 0x0f100000 0x00 0x400>,
 		      <0x00 0x0d000000 0x00 0x00800000>,
-		      <0x00 0x68000000 0x00 0x00001000>;
+		      <0x06 0x00000000 0x00 0x00001000>; /* ECAM (4 KB) */
 		reg-names = "intd_cfg", "user_cfg", "reg", "cfg";
 		interrupt-names = "link_state";
 		interrupts = <GIC_SPI 203 IRQ_TYPE_EDGE_RISING>;
@@ -1049,8 +1049,8 @@ pcie0_rc: pcie@...2000 {
 		vendor-id = <0x104c>;
 		device-id = <0xb010>;
 		msi-map = <0x0 &gic_its 0x0 0x10000>;
-		ranges = <0x01000000 0x00 0x68001000  0x00 0x68001000  0x00 0x0010000>,
-			 <0x02000000 0x00 0x68011000  0x00 0x68011000  0x00 0x7fef000>;
+		ranges = <0x01000000 0x00 0x00001000 0x06 0x00001000 0x00 0x00100000>, /* IO (1 MB) */
+			 <0x02000000 0x00 0x00101000 0x06 0x00101000 0x00 0xffeff000>; /* 32-bit Non-Prefetchable MEM (4 GB - 1 MB - 4 KB) */
 		dma-ranges = <0x02000000 0x0 0x0 0x0 0x0 0x00000010 0x0>;
 		status = "disabled";
 	};
-- 
2.34.1