linux-kernel - [PATCH v8 1/3] PCI: microchip: Fix outbound address translation tables

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Message-ID: <20240821130217.957424-2-daire.mcnamara@microchip.com>
Date: Wed, 21 Aug 2024 14:02:15 +0100
From: <daire.mcnamara@...rochip.com>
To: <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>
CC: <conor.dooley@...rochip.com>, <lpieralisi@...nel.org>, <kw@...ux.com>,
	<robh@...nel.org>, <bhelgaas@...gle.com>, <linux-kernel@...r.kernel.org>,
	<linux-riscv@...ts.infradead.org>, <krzk+dt@...nel.org>,
	<conor+dt@...nel.org>, <daire.mcnamara@...rochip.com>,
	<ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH v8 1/3] PCI: microchip: Fix outbound address translation tables

From: Daire McNamara <daire.mcnamara@...rochip.com>

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.

This necessitates changing a size_t in mc_pcie_setup_window
to a u64 to avoid a compile error on 32-bit platforms.

Fixes: 6f15a9c9f941 ("PCI: microchip: Add Microchip Polarfire PCIe controller driver")
Signed-off-by: Daire McNamara <daire.mcnamara@...rochip.com>
Acked-by: Conor Dooley <conor.dooley@...rochip.com>
Reviewed-by: Ilpo Jarvinen <ilpo.jarvinen@...ux.intel.com>
---
 .../pci/controller/plda/pcie-microchip-host.c | 30 ++++++++++++++++---
 1 file changed, 26 insertions(+), 4 deletions(-)

diff --git a/drivers/pci/controller/plda/pcie-microchip-host.c b/drivers/pci/controller/plda/pcie-microchip-host.c
index 48f60a04b740..da766de347bd 100644
--- a/drivers/pci/controller/plda/pcie-microchip-host.c
+++ b/drivers/pci/controller/plda/pcie-microchip-host.c
@@ -21,6 +21,8 @@
 #include "../../pci.h"
 #include "pcie-plda.h"
 
+#define MC_OUTBOUND_TRANS_TBL_MASK		GENMASK(31, 0)
+
 /* PCIe Bridge Phy and Controller Phy offsets */
 #define MC_PCIE1_BRIDGE_ADDR			0x00008000u
 #define MC_PCIE1_CTRL_ADDR			0x0000a000u
@@ -612,6 +614,27 @@ static void mc_disable_interrupts(struct mc_pcie *port)
 	writel_relaxed(GENMASK(31, 0), bridge_base_addr + ISTATUS_HOST);
 }
 
+int mc_pcie_setup_iomems(struct pci_host_bridge *bridge,
+			   struct plda_pcie_rp *port)
+{
+	void __iomem *bridge_base_addr = port->bridge_addr;
+	struct resource_entry *entry;
+	u64 pci_addr;
+	u32 index = 1;
+
+	resource_list_for_each_entry(entry, &bridge->windows) {
+		if (resource_type(entry->res) == IORESOURCE_MEM) {
+			pci_addr = entry->res->start - entry->offset;
+			plda_pcie_setup_window(bridge_base_addr, index,
+					       entry->res->start & MC_OUTBOUND_TRANS_TBL_MASK,
+					       pci_addr, resource_size(entry->res));
+			index++;
+		}
+	}
+
+	return 0;
+}
+
 static int mc_platform_init(struct pci_config_window *cfg)
 {
 	struct device *dev = cfg->parent;
@@ -622,15 +645,14 @@ static int mc_platform_init(struct pci_config_window *cfg)
 	int ret;
 
 	/* Configure address translation table 0 for PCIe config space */
-	plda_pcie_setup_window(bridge_base_addr, 0, cfg->res.start,
-			       cfg->res.start,
-			       resource_size(&cfg->res));
+	plda_pcie_setup_window(bridge_base_addr, 0, cfg->res.start & MC_OUTBOUND_TRANS_TBL_MASK,
+			       0, resource_size(&cfg->res));
 
 	/* Need some fixups in config space */
 	mc_pcie_enable_msi(port, cfg->win);
 
 	/* Configure non-config space outbound ranges */
-	ret = plda_pcie_setup_iomems(bridge, &port->plda);
+	ret = mc_pcie_setup_iomems(bridge, &port->plda);
 	if (ret)
 		return ret;
 
-- 
2.34.1