Unverified Commit ff8d9203 authored by Manivannan Sadhasivam's avatar Manivannan Sadhasivam Committed by Krzysztof Wilczyński
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PCI: qcom-ep: Add eDMA support 

Qualcomm PCIe Endpoint controllers have the in-built Embedded DMA (eDMA)
peripheral for offloading the data transfer between the PCIe bus and
memory.

Let's add support for it by enabling the eDMA IRQ in the driver. The
eDMA DMA Engine driver will handle the rest of the functionality.

Since the eDMA on Qualcomm platforms only uses a single IRQ for all
channels, use 1 for edma.nr_irqs.

[kwilczynski: commit log]
Link: https://lore.kernel.org/linux-pci/20230717065459.14138-4-manivannan.sadhasivam@linaro.org


Signed-off-by: default avatarManivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: default avatarKrzysztof Wilczyński <kwilczynski@kernel.org>
parent d9d9f26f

drivers/pci/controller/dwc/pcie-qcom-ep.c

+3 −1
Original line number Diff line number Diff line
@@ -74,6 +74,7 @@ 
#define PARF_INT_ALL_PLS_ERR			BIT(15)

#define PARF_INT_ALL_PME_LEGACY			BIT(16)

#define PARF_INT_ALL_PLS_PME			BIT(17)

#define PARF_INT_ALL_EDMA			BIT(22)



/* PARF_BDF_TO_SID_CFG register fields */

#define PARF_BDF_TO_SID_BYPASS			BIT(0)
@@ -395,7 +396,7 @@ static int qcom_pcie_perst_deassert(struct dw_pcie *pci) 
	writel_relaxed(0, pcie_ep->parf + PARF_INT_ALL_MASK);

	val = PARF_INT_ALL_LINK_DOWN | PARF_INT_ALL_BME |

	      PARF_INT_ALL_PM_TURNOFF | PARF_INT_ALL_DSTATE_CHANGE |

	      PARF_INT_ALL_LINK_UP;

	      PARF_INT_ALL_LINK_UP | PARF_INT_ALL_EDMA;

	writel_relaxed(val, pcie_ep->parf + PARF_INT_ALL_MASK);



	ret = dw_pcie_ep_init_complete(&pcie_ep->pci.ep);
@@ -744,6 +745,7 @@ static int qcom_pcie_ep_probe(struct platform_device *pdev) 
	pcie_ep->pci.dev = dev;

	pcie_ep->pci.ops = &pci_ops;

	pcie_ep->pci.ep.ops = &pci_ep_ops;

	pcie_ep->pci.edma.nr_irqs = 1;

	platform_set_drvdata(pdev, pcie_ep);



	ret = qcom_pcie_ep_get_resources(pdev, pcie_ep);