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Since the DW eDMA core now supports eDMA controllers embedded in locally accessible DW PCIe Root Ports and Endpoints, register these controllers when possible. To do that the DW PCIe core driver needs to perform some preparations first. First of all, it needs to find the eDMA controller CSRs base address, whether they are accessible over the Port Logic or iATU unrolled space. Afterwards it can try to auto-detect the eDMA controller availability and number of read/write channels. If none are found the procedure silently returns without error. Secondly, the platform is supposed to provide either combined or per-channel IRQ signals. If no valid IRQs set is found, the procedure returns without error to be backward compatible with platforms where DW PCIe controllers have eDMA but lack the IRQ description. Finally, before actually probing the eDMA device we need to allocate LLP items buffers. After that the DW eDMA can be registered. If registration is successful, a message regarding the number of detected Read/Write eDMA channels will be printed to the system as is done for the iATU settings. Note: the DW PCI controller driver (either host or endpoint mode) is currently always built-in, so if the DW eDMA core is built as a module (CONFIG_DW_EDMA=m), eDMA controllers will not be registered even if the dw-edma module is later loaded. Link: https://lore.kernel.org/r/20230113171409.30470-28-Sergey.Semin@baikalelectronics.ru Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru> Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Acked-by: Vinod Koul <vkoul@kernel.org> |
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| .. | ||
| controller | ||
| endpoint | ||
| hotplug | ||
| msi | ||
| pcie | ||
| switch | ||
| access.c | ||
| ats.c | ||
| bus.c | ||
| doe.c | ||
| ecam.c | ||
| host-bridge.c | ||
| iov.c | ||
| irq.c | ||
| Kconfig | ||
| Makefile | ||
| mmap.c | ||
| of.c | ||
| p2pdma.c | ||
| pci-acpi.c | ||
| pci-bridge-emul.c | ||
| pci-bridge-emul.h | ||
| pci-driver.c | ||
| pci-label.c | ||
| pci-mid.c | ||
| pci-pf-stub.c | ||
| pci-stub.c | ||
| pci-sysfs.c | ||
| pci.c | ||
| pci.h | ||
| probe.c | ||
| proc.c | ||
| quirks.c | ||
| remove.c | ||
| rom.c | ||
| search.c | ||
| setup-bus.c | ||
| setup-irq.c | ||
| setup-res.c | ||
| slot.c | ||
| syscall.c | ||
| vc.c | ||
| vgaarb.c | ||
| vpd.c | ||
| xen-pcifront.c | ||