From: Serge Semin Sergey.Semin@baikalelectronics.ru
[ Upstream commit d1cf738f2b65a5640234e1da90a68d3523fbed83 ]
dw_pcie_disable_atu() was introduced by f8aed6ec624f ("PCI: dwc: designware: Add EP mode support") and supported only the viewport version of the iATU CSRs.
DW PCIe IP cores v4.80a and newer also support unrolled iATU/eDMA space. Callers of dw_pcie_disable_atu(), including pci_epc_ops.clear_bar(), pci_epc_ops.unmap_addr(), and dw_pcie_setup_rc(), don't work correctly when it is enabled.
Add dw_pcie_disable_atu() support for controllers with unrolled iATU CSRs enabled.
[bhelgaas: commit log] Fixes: f8aed6ec624f ("PCI: dwc: designware: Add EP mode support") Link: https://lore.kernel.org/r/20220624143428.8334-3-Sergey.Semin@baikalelectroni... Tested-by: Manivannan Sadhasivam manivannan.sadhasivam@linaro.org Signed-off-by: Serge Semin Sergey.Semin@baikalelectronics.ru Signed-off-by: Bjorn Helgaas bhelgaas@google.com Reviewed-by: Manivannan Sadhasivam manivannan.sadhasivam@linaro.org Reviewed-by: Rob Herring robh@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pci/controller/dwc/pcie-designware.c | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c index c2dea8fc97c8..69651c6ae6c6 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -439,7 +439,7 @@ int dw_pcie_prog_inbound_atu(struct dw_pcie *pci, u8 func_no, int index, void dw_pcie_disable_atu(struct dw_pcie *pci, int index, enum dw_pcie_region_type type) { - int region; + u32 region;
switch (type) { case DW_PCIE_REGION_INBOUND: @@ -452,8 +452,18 @@ void dw_pcie_disable_atu(struct dw_pcie *pci, int index, return; }
- dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, region | index); - dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, ~(u32)PCIE_ATU_ENABLE); + if (pci->iatu_unroll_enabled) { + if (region == PCIE_ATU_REGION_INBOUND) { + dw_pcie_writel_ib_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2, + ~(u32)PCIE_ATU_ENABLE); + } else { + dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL2, + ~(u32)PCIE_ATU_ENABLE); + } + } else { + dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, region | index); + dw_pcie_writel_dbi(pci, PCIE_ATU_CR2, ~(u32)PCIE_ATU_ENABLE); + } }
int dw_pcie_wait_for_link(struct dw_pcie *pci)