From: Pratyush Anand pp->io_base which is the input of the outbound IO address translation unit should be the cpu address, it was programmed wrongly to realio address. We should pass global_io_offset rather than sys->io_offset to pci_ioremap_io, so we map the new window into the first available spot in the Linux view of the I/O space. We must also pass cpu address instead of realio address to pci_ioremap_io. This patch fixes above issue. It has been tested with Lecroy PTC in AIC mode and Pericom PI7C9X2G303EL PCIe switch, which does not work otherwise. Signed-off-by: Pratyush Anand Tested-by: Mohit Kumar Tested-by: Tim Harvey Cc: Arnd Bergmann Cc: Marek Vasut Cc: Richard Zhu Cc: linux-pci@vger.kernel.org Cc: spear-devel@list.st.com --- drivers/pci/host/pcie-designware.c | 5 ++--- 1 files changed, 2 insertions(+), 3 deletions(-) http://thread.gmane.org/gmane.linux.kernel.pci/27204 --- a/drivers/pci/host/pcie-designware.c +++ b/drivers/pci/host/pcie-designware.c @@ -177,6 +177,7 @@ int __init dw_pcie_host_init(struct pcie + global_io_offset); pp->config.io_size = resource_size(&pp->io); pp->config.io_bus_addr = range.pci_addr; + pp->io_base = range.cpu_addr; } if (restype == IORESOURCE_MEM) { of_pci_range_to_resource(&range, np, &pp->mem); @@ -202,7 +203,6 @@ int __init dw_pcie_host_init(struct pcie pp->cfg0_base = pp->cfg.start; pp->cfg1_base = pp->cfg.start + pp->config.cfg0_size; - pp->io_base = pp->io.start; pp->mem_base = pp->mem.start; pp->va_cfg0_base = devm_ioremap(pp->dev, pp->cfg0_base, @@ -449,7 +449,7 @@ int dw_pcie_setup(int nr, struct pci_sys if (global_io_offset < SZ_1M && pp->config.io_size > 0) { sys->io_offset = global_io_offset - pp->config.io_bus_addr; - pci_ioremap_io(sys->io_offset, pp->io.start); + pci_ioremap_io(global_io_offset, pp->io_base); global_io_offset += SZ_64K; pci_add_resource_offset(&sys->resources, &pp->io, sys->io_offset);