linux-kernel - [PATCH 1/2] PCI: microchip: Fix outbound address translation tables

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Date: Fri, 31 May 2024 09:53:32 +0100
From: Daire McNamara <daire.mcnamara@...rochip.com>
To: <linux-pci@...r.kernel.org>
CC: Conor Dooley <conor.dooley@...rochip.com>, Lorenzo Pieralisi
	<lpieralisi@...nel.org>, Krzysztof Wilczyński
	<kw@...ux.com>, Rob Herring <robh@...nel.org>, Bjorn Helgaas
	<bhelgaas@...gle.com>, <linux-kernel@...r.kernel.org>,
	<linux-riscv@...ts.infradead.org>, Daire McNamara
	<daire.mcnamara@...rochip.com>
Subject: [PATCH 1/2] PCI: microchip: Fix outbound address translation tables

On Microchip PolarFire SoC (MPFS) the PCIe Root Port can be behind one of
three general-purpose Fabric Interface Controller (FIC) buses that
encapsulate an AXI-M interface. That FIC is responsible for managing
the translations of the upper 32-bits of the AXI-M address. On MPFS,
the Root Port driver needs to take account of that outbound address
translation done by the parent FIC bus before setting up its own
outbound address translation tables.  In all cases on MPFS,
the remaining outbound address translation tables are 32-bit only.

Limit the outbound address translation tables to 32-bit only.

Fixes: 6f15a9c9f941 ("PCI: microchip: Add Microchip Polarfire PCIe controller driver")

Signed-off-by: Daire McNamara <daire.mcnamara@...rochip.com>
---
 drivers/pci/controller/pcie-microchip-host.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/controller/pcie-microchip-host.c b/drivers/pci/controller/pcie-microchip-host.c
index 137fb8570ba2..0795cd122a4a 100644
--- a/drivers/pci/controller/pcie-microchip-host.c
+++ b/drivers/pci/controller/pcie-microchip-host.c
@@ -983,7 +983,8 @@ static int mc_pcie_setup_windows(struct platform_device *pdev,
 		if (resource_type(entry->res) == IORESOURCE_MEM) {
 			pci_addr = entry->res->start - entry->offset;
 			mc_pcie_setup_window(bridge_base_addr, index,
-					     entry->res->start, pci_addr,
+					     entry->res->start & 0xffffffff,
+					     pci_addr & 0xffffffff,
 					     resource_size(entry->res));
 			index++;
 		}
@@ -1117,8 +1118,8 @@ static int mc_platform_init(struct pci_config_window *cfg)
 	int ret;
 
 	/* Configure address translation table 0 for PCIe config space */
-	mc_pcie_setup_window(bridge_base_addr, 0, cfg->res.start,
-			     cfg->res.start,
+	mc_pcie_setup_window(bridge_base_addr, 0, cfg->res.start & 0xffffffff,
+			     cfg->res.start & 0xffffffff,
 			     resource_size(&cfg->res));
 
 	/* Need some fixups in config space */
-- 
2.34.1