[PATCH v8 2/5] PCI: dwc: Add support for ELBI resource mapping

[Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>]

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@linaro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@oss.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 89aad5a08928cc29870ab258d33bee9ff8f83143..4684c671a81bee468f686a83cc992433b38af59d 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 00f52d472dcdd794013a865ad6c4c7cc251edb48..ceb022506c3191cd8fe580411526e20cc3758fed 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -492,6 +492,7 @@ 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