[PATCH] arm64: dts: rockchip: enable the mmu600_pcie IOMMU on the rk3588 SoC

[Niklas Cassel]

Commit cd81d3a0695c ("arm64: dts: rockchip: add rk3588 pcie and php
IOMMUs") added the rk3588 SoC's pcie IOMMU and php IOMMU as disabled.

The mmu600_pcie is connected with the five PCIe controllers.
See 8.2 Block Diagram, in rk3588 TRM (Technical Reference Manual).

The five PCIe controllers are:
pcie3x4, pcie3x2, pcie2x1l0, pcie2x1l1, pcie2x1l2.

pcie3x4 can run in either Root Complex mode or Endpoint mode, the other
four PCIe controllers can only run in Root Complex mode. To describe this
we thus have six different device nodes in the device tree.

A PCIe controller in Root Complex mode needs to specify an iommu-map, such
that the device knows how to convert a Requester ID (PCI BDF) to an IOMMU
master ID (stream ID). (A PCIe controller in Endpoint mode should use the
iommus property, just like a regular device.)

If you look at the device tree bindings for msi-map and iommu-map, you can
see that the conversion from Requester ID to MSI-specifier data is the same
as the conversion from Requester ID to IOMMU specifier data. Thus it is
sensible to define the iommu-map property value similar to the msi-map,
such that the conversion will be identical.

Add the proper iommu device tree properties for these six device nodes
connected to the mmu600_pcie, so that we can enable the mmu600_pcie IOMMU.
(The mmu600_php IOMMU is not touched, so it is still disabled.)

Signed-off-by: Niklas Cassel <cassel at kernel.org>
---
Testing done:
-pcie2x1l2: Ethernet connected to the pcie2x1l2 works as expected.
-pcie3x4: A PCIe endpoint (running the PCI endpoint framework) connected to
 pcie3x4 can run pcitest.sh without any issues.
 Modifying the PCI endpoint to DMA to an invalid address gives IOMMU errors
 (as expected).
-pcie3x4_ep: A PCIe root complex (running Linux) connected to pcie3x4_ep can
 run pcitest.sh without any issues.
 Modifying the PCI endpoint's inbound address translation to point to a
 buffer that has not been mapped using the DMA API, results in IOMMU errors
 when the RC writes to the PCI BARs exposed by the endpoint (as expected).
-My board does not expose a convenient method to test the other PCIe
 controllers, but considering that the ones that I did test worked fine,
 I do not see any reason why the others should not do the same.

 arch/arm64/boot/dts/rockchip/rk3588-base.dtsi  | 3 ++-
 arch/arm64/boot/dts/rockchip/rk3588-extra.dtsi | 4 ++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588-base.dtsi b/arch/arm64/boot/dts/rockchip/rk3588-base.dtsi
index d97d84b888375..f96e607db2857 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588-base.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3588-base.dtsi
@@ -551,7 +551,6 @@ mmu600_pcie: iommu at fc900000 {
 			     <GIC_SPI 367 IRQ_TYPE_LEVEL_HIGH 0>;
 		interrupt-names = "eventq", "gerror", "priq", "cmdq-sync";
 		#iommu-cells = <1>;
-		status = "disabled";
 	};
 
 	mmu600_php: iommu at fcb00000 {
@@ -1641,6 +1640,7 @@ pcie2x1l1: pcie at fe180000 {
 		linux,pci-domain = <3>;
 		max-link-speed = <2>;
 		msi-map = <0x3000 &its0 0x3000 0x1000>;
+		iommu-map = <0x3000 &mmu600_pcie 0x3000 0x1000>;
 		num-lanes = <1>;
 		phys = <&combphy2_psu PHY_TYPE_PCIE>;
 		phy-names = "pcie-phy";
@@ -1692,6 +1692,7 @@ pcie2x1l2: pcie at fe190000 {
 		linux,pci-domain = <4>;
 		max-link-speed = <2>;
 		msi-map = <0x4000 &its0 0x4000 0x1000>;
+		iommu-map = <0x4000 &mmu600_pcie 0x4000 0x1000>;
 		num-lanes = <1>;
 		phys = <&combphy0_ps PHY_TYPE_PCIE>;
 		phy-names = "pcie-phy";
diff --git a/arch/arm64/boot/dts/rockchip/rk3588-extra.dtsi b/arch/arm64/boot/dts/rockchip/rk3588-extra.dtsi
index 0ce0934ec6b79..4a950907ea6f5 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588-extra.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3588-extra.dtsi
@@ -162,6 +162,7 @@ pcie3x4: pcie at fe150000 {
 		linux,pci-domain = <0>;
 		max-link-speed = <3>;
 		msi-map = <0x0000 &its1 0x0000 0x1000>;
+		iommu-map = <0x0000 &mmu600_pcie 0x0000 0x1000>;
 		num-lanes = <4>;
 		phys = <&pcie30phy>;
 		phy-names = "pcie-phy";
@@ -212,6 +213,7 @@ pcie3x4_ep: pcie-ep at fe150000 {
 		interrupt-names = "sys", "pmc", "msg", "legacy", "err",
 				  "dma0", "dma1", "dma2", "dma3";
 		max-link-speed = <3>;
+		iommus = <&mmu600_pcie 0x0000>;
 		num-lanes = <4>;
 		phys = <&pcie30phy>;
 		phy-names = "pcie-phy";
@@ -248,6 +250,7 @@ pcie3x2: pcie at fe160000 {
 		linux,pci-domain = <1>;
 		max-link-speed = <3>;
 		msi-map = <0x1000 &its1 0x1000 0x1000>;
+		iommu-map = <0x1000 &mmu600_pcie 0x1000 0x1000>;
 		num-lanes = <2>;
 		phys = <&pcie30phy>;
 		phy-names = "pcie-phy";
@@ -297,6 +300,7 @@ pcie2x1l0: pcie at fe170000 {
 		linux,pci-domain = <2>;
 		max-link-speed = <2>;
 		msi-map = <0x2000 &its0 0x2000 0x1000>;
+		iommu-map = <0x2000 &mmu600_pcie 0x2000 0x1000>;
 		num-lanes = <1>;
 		phys = <&combphy1_ps PHY_TYPE_PCIE>;
 		phy-names = "pcie-phy";
-- 
2.47.0