linux-kernel - [PATCH v6 2/5] PCI: dwc: Add support for ELBI resource mapping

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Message-Id: <20250712-ecam_v4-v6-2-d820f912e354@qti.qualcomm.com>
Date: Sat, 12 Jul 2025 05:12:38 +0530
From: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
To: cros-qcom-dts-watchers@...omium.org,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Krzysztof Wilczyński <kwilczynski@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>, Jingoo Han <jingoohan1@...il.com>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        quic_vbadigan@...cinc.com, quic_mrana@...cinc.com,
        quic_vpernami@...cinc.com, mmareddy@...cinc.com,
        Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>,
        Manivannan Sadhasivam <mani@...nel.org>
Subject: [PATCH v6 2/5] PCI: dwc: Add support for ELBI resource mapping

External Local Bus Interface(ELBI) registers are optional registers in
DWC IPs having vendor specific registers.

Since ELBI register space is applicable for all DWC based controllers,
move the resource get code to DWC core and make it optional.

Suggested-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
---
 drivers/pci/controller/dwc/pcie-designware.c | 9 +++++++++
 drivers/pci/controller/dwc/pcie-designware.h | 1 +
 2 files changed, 10 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index 4d794964fa0fd3531e2f35f16a8a765c00f9b416..f7bbfd91b03b5e18031983ff4ebd829f450b8154 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -167,6 +167,15 @@ int dw_pcie_get_resources(struct dw_pcie *pci)
 		}
 	}
 
+	if (!pci->elbi_base) {
+		res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "elbi");
+		if (res) {
+			pci->elbi_base = devm_ioremap_resource(pci->dev, res);
+			if (IS_ERR(pci->elbi_base))
+				return PTR_ERR(pci->elbi_base);
+		}
+	}
+
 	/* LLDD is supposed to manually switch the clocks and resets state */
 	if (dw_pcie_cap_is(pci, REQ_RES)) {
 		ret = dw_pcie_get_clocks(pci);
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index ce9e18554e426e46f0376af22ffc99e329c2ccb8..31b2a7e9dafa4ab481434068bde0775837babb4f 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -497,6 +497,7 @@ struct dw_pcie {
 	resource_size_t		dbi_phys_addr;
 	void __iomem		*dbi_base2;
 	void __iomem		*atu_base;
+	void __iomem		*elbi_base;
 	resource_size_t		atu_phys_addr;
 	size_t			atu_size;
 	resource_size_t		parent_bus_offset;

-- 
2.34.1