linux-kernel - [PATCH 1/3] PCI: dwc: Add support for vendor specific capability search

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Date: Tue, 25 Jun 2024 15:08:11 +0530
From: Shradha Todi <shradha.t@...sung.com>
To: linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Cc: manivannan.sadhasivam@...aro.org, lpieralisi@...nel.org, kw@...ux.com,
	robh@...nel.org, bhelgaas@...gle.com, jingoohan1@...il.com,
	fancer.lancer@...il.com, yoshihiro.shimoda.uh@...esas.com,
	conor.dooley@...rochip.com, pankaj.dubey@...sung.com, gost.dev@...sung.com,
	Shradha Todi <shradha.t@...sung.com>
Subject: [PATCH 1/3] PCI: dwc: Add support for vendor specific capability
 search

Add vendor specific extended configuration space capability search API
using struct dw_pcie pointer for DW controllers.

Signed-off-by: Shradha Todi <shradha.t@...sung.com>
---
 drivers/pci/controller/dwc/pcie-designware.c | 16 ++++++++++++++++
 drivers/pci/controller/dwc/pcie-designware.h |  1 +
 2 files changed, 17 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index 250cf7f40b85..b74e4a97558e 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -275,6 +275,22 @@ static u16 dw_pcie_find_next_ext_capability(struct dw_pcie *pci, u16 start,
 	return 0;
 }
 
+u16 dw_pcie_find_vsec_capability(struct dw_pcie *pci, u8 vsec_cap)
+{
+	u16 vsec = 0;
+	u32 header;
+
+	while ((vsec = dw_pcie_find_next_ext_capability(pci, vsec,
+					PCI_EXT_CAP_ID_VNDR))) {
+		header = dw_pcie_readl_dbi(pci, vsec + PCI_VNDR_HEADER);
+		if (PCI_VNDR_HEADER_ID(header) == vsec_cap)
+			return vsec;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(dw_pcie_find_vsec_capability);
+
 u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap)
 {
 	return dw_pcie_find_next_ext_capability(pci, 0, cap);
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index f8e5431a207b..77686957a30d 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -423,6 +423,7 @@ void dw_pcie_version_detect(struct dw_pcie *pci);
 
 u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap);
 u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap);
+u16 dw_pcie_find_vsec_capability(struct dw_pcie *pci, u8 vsec_cap);
 
 int dw_pcie_read(void __iomem *addr, int size, u32 *val);
 int dw_pcie_write(void __iomem *addr, int size, u32 val);
-- 
2.17.1