Add vendor specific extended configuration space capability search API
using struct dw_pcie pointer for DW controllers.
Signed-off-by: Shradha Todi <shradha.t@xxxxxxxxxxx>
---
drivers/pci/controller/dwc/pcie-designware.c | 19 +++++++++++++++++++
drivers/pci/controller/dwc/pcie-designware.h | 1 +
2 files changed, 20 insertions(+)
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index 6d6cbc8b5b2c..3588197ba2d7 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -277,6 +277,25 @@ 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, u16 vendor_id, u16 vsec_cap)
+{
+ u16 vsec = 0;
+ u32 header;
+
+ if (vendor_id != dw_pcie_readw_dbi(pci, PCI_VENDOR_ID))
+ return 0;
+
+ 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 347ab74ac35a..02e94bd9b042 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -476,6 +476,7 @@ 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, u16 vendor_id, u16 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
