diff options
| author | Rob Herring <robh@kernel.org> | 2020-11-05 15:11:59 -0600 |
|---|---|---|
| committer | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2020-11-19 10:51:41 +0000 |
| commit | 281f1f99cf3a761b45f611943721dfb1895c68a3 (patch) | |
| tree | a5333f35268b2673d19f73ba5fbf5025abf56b22 /drivers/pci/controller/dwc/pcie-designware-ep.c | |
| parent | 9ca17af552bcd28cb91b6317edd945b4134411fa (diff) | |
PCI: dwc: Detect number of iATU windows
Currently the number of inbound and outbound iATU windows are determined
from DT properties. Unfortunately, there's 'num-viewport' for RC mode
and 'num-ib-windows' and 'num-ob-windows' for EP mode, yet the number of
windows is not mode dependent. Also, 'num-viewport' is not clear whether
that's inbound, outbound or both. We can probably assume it's outbound
windows as that's all RC mode uses.
However, using DT properties isn't really needed as the number of
regions can be detected at runtime by poking the iATU registers. The
basic algorithm is just writing a target address and reading back what
we wrote. In the unrolled ATU case, we have to take care not to go
past the mapped region.
With this, we can drop num_viewport in favor of num_ob_windows instead.
Link: https://lore.kernel.org/r/20201105211159.1814485-17-robh@kernel.org
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Jonathan Hunter <jonathanh@nvidia.com>
Cc: linux-tegra@vger.kernel.org
Diffstat (limited to 'drivers/pci/controller/dwc/pcie-designware-ep.c')
| -rw-r--r-- | drivers/pci/controller/dwc/pcie-designware-ep.c | 20 |
1 files changed, 0 insertions, 20 deletions
diff --git a/drivers/pci/controller/dwc/pcie-designware-ep.c b/drivers/pci/controller/dwc/pcie-designware-ep.c index 79b998982e41..bcd1cd9ba8c8 100644 --- a/drivers/pci/controller/dwc/pcie-designware-ep.c +++ b/drivers/pci/controller/dwc/pcie-designware-ep.c @@ -714,26 +714,6 @@ int dw_pcie_ep_init(struct dw_pcie_ep *ep) ep->phys_base = res->start; ep->addr_size = resource_size(res); - ret = of_property_read_u32(np, "num-ib-windows", &pci->num_ib_windows); - if (ret < 0) { - dev_err(dev, "Unable to read *num-ib-windows* property\n"); - return ret; - } - if (pci->num_ib_windows > MAX_IATU_IN) { - dev_err(dev, "Invalid *num-ib-windows*\n"); - return -EINVAL; - } - - ret = of_property_read_u32(np, "num-ob-windows", &pci->num_ob_windows); - if (ret < 0) { - dev_err(dev, "Unable to read *num-ob-windows* property\n"); - return ret; - } - if (pci->num_ob_windows > MAX_IATU_OUT) { - dev_err(dev, "Invalid *num-ob-windows*\n"); - return -EINVAL; - } - ep->ib_window_map = devm_kcalloc(dev, BITS_TO_LONGS(pci->num_ib_windows), sizeof(long), |