[PATCH v7 4/9] PCI: dwc: Record integrated eDMA register window
From: Koichiro Den <hidden>
Date: 2026-02-15 16:39:10
Also in:
linux-pci, linux-rockchip, lkml
Subsystem:
pci driver for synopsys designware, pci native host bridge and endpoint drivers, pci subsystem, the rest · Maintainers:
Jingoo Han, Manivannan Sadhasivam, Lorenzo Pieralisi, Krzysztof Wilczyński, Bjorn Helgaas, Linus Torvalds
Some DesignWare PCIe controllers integrate an eDMA block whose registers are located in a dedicated register window. Endpoint function drivers may need the physical base and size of this window to map/expose it to a peer. Record the physical base and size of the integrated eDMA register window in struct dw_pcie. Reviewed-by: Frank Li <Frank.Li@nxp.com> Signed-off-by: Koichiro Den <redacted> --- drivers/pci/controller/dwc/pcie-designware.c | 4 ++++ drivers/pci/controller/dwc/pcie-designware.h | 2 ++ 2 files changed, 6 insertions(+)
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index 5741c09dde7f..f82ed189f6ae 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c@@ -162,8 +162,12 @@ int dw_pcie_get_resources(struct dw_pcie *pci) pci->edma.reg_base = devm_ioremap_resource(pci->dev, res); if (IS_ERR(pci->edma.reg_base)) return PTR_ERR(pci->edma.reg_base); + pci->edma_reg_phys = res->start; + pci->edma_reg_size = resource_size(res); } else if (pci->atu_size >= 2 * DEFAULT_DBI_DMA_OFFSET) { pci->edma.reg_base = pci->atu_base + DEFAULT_DBI_DMA_OFFSET; + pci->edma_reg_phys = pci->atu_phys_addr + DEFAULT_DBI_DMA_OFFSET; + pci->edma_reg_size = pci->atu_size - DEFAULT_DBI_DMA_OFFSET; } }
diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index ae6389dd9caa..52f26663e8b1 100644
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h@@ -541,6 +541,8 @@ struct dw_pcie { int max_link_speed; u8 n_fts[2]; struct dw_edma_chip edma; + phys_addr_t edma_reg_phys; + resource_size_t edma_reg_size; bool l1ss_support; /* L1 PM Substates support */ struct clk_bulk_data app_clks[DW_PCIE_NUM_APP_CLKS]; struct clk_bulk_data core_clks[DW_PCIE_NUM_CORE_CLKS];
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2.51.0