So far we've assumed a fixed configuration for inbound windows as we had a single user for this controller. But the controller's DMA constraints were improved starting with BCM2711's B1 revision of the SoC, notably available in CM4 and Pi400. They allow for wider inbound windows. We can now cover the whole address space, whereas before we where limited to the lower 3GB.
This information is passed to us through DT's 'dma-ranges' property and it's specially important for us to honor it since some interactions with the board's co-processor assume we're doing so (specifically the XHCI firmware load operation, which is handled by the co-processor after u-boot has correctly configured the PCIe controller).
Signed-off-by: Nicolas Saenz Julienne nsaenzjulienne@suse.de Tested-by: Peter Robinson pbrobinson@gmail.com --- drivers/pci/pcie_brcmstb.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-)
diff --git a/drivers/pci/pcie_brcmstb.c b/drivers/pci/pcie_brcmstb.c index dd2a4ef629..bd645d7896 100644 --- a/drivers/pci/pcie_brcmstb.c +++ b/drivers/pci/pcie_brcmstb.c @@ -432,6 +432,7 @@ static int brcm_pcie_probe(struct udevice *dev) struct pci_controller *hose = dev_get_uclass_priv(ctlr); struct brcm_pcie *pcie = dev_get_priv(dev); void __iomem *base = pcie->base; + struct pci_region region; bool ssc_good = false; int num_out_wins = 0; u64 rc_bar2_offset, rc_bar2_size; @@ -468,13 +469,10 @@ static int brcm_pcie_probe(struct udevice *dev) MISC_CTRL_SCB_ACCESS_EN_MASK | MISC_CTRL_CFG_READ_UR_MODE_MASK | MISC_CTRL_MAX_BURST_SIZE_128); - /* - * TODO: When support for other SoCs than BCM2711 is added we may - * need to use the base address and size(s) provided in the dma-ranges - * property. - */ - rc_bar2_offset = 0; - rc_bar2_size = 0xc0000000; + + pci_get_dma_regions(dev, ®ion, 0); + rc_bar2_offset = region.bus_start - region.phys_start; + rc_bar2_size = 1ULL << fls64(region.size - 1);
tmp = lower_32_bits(rc_bar2_offset); u32p_replace_bits(&tmp, brcm_pcie_encode_ibar_size(rc_bar2_size),