The host bridge MMIO region is disabled by default due to which MMIO accesses cause an exception. Fix it by setting the bridge enable bit. This change is ported from the linux pcie-xilinx driver.
Signed-off-by: Mayuresh Chitale mchitale@ventanamicro.com --- drivers/pci/pcie_xilinx.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/pci/pcie_xilinx.c b/drivers/pci/pcie_xilinx.c index 20b630027f..d1fbd40175 100644 --- a/drivers/pci/pcie_xilinx.c +++ b/drivers/pci/pcie_xilinx.c @@ -25,6 +25,8 @@ struct xilinx_pcie { /* Register definitions */ #define XILINX_PCIE_REG_PSCR 0x144 #define XILINX_PCIE_REG_PSCR_LNKUP BIT(11) +#define XILINX_PCIE_REG_RPSC 0x148 +#define XILINX_PCIE_REG_RPSC_BEN BIT(0)
/** * pcie_xilinx_link_up() - Check whether the PCIe link is up @@ -142,6 +144,7 @@ static int pcie_xilinx_of_to_plat(struct udevice *dev) struct xilinx_pcie *pcie = dev_get_priv(dev); fdt_addr_t addr; fdt_size_t size; + u32 rpsc;
addr = dev_read_addr_size(dev, &size); if (addr == FDT_ADDR_T_NONE) @@ -149,6 +152,11 @@ static int pcie_xilinx_of_to_plat(struct udevice *dev)
pcie->cfg_base = map_physmem(addr, size, MAP_NOCACHE);
+ /* Enable the Bridge enable bit */ + rpsc = __raw_readl(pcie->cfg_base + XILINX_PCIE_REG_RPSC); + rpsc |= XILINX_PCIE_REG_RPSC_BEN; + __raw_writel(rpsc, pcie->cfg_base + XILINX_PCIE_REG_RPSC); + return 0; }