PCI: layerscape: Disable outbound windows configured by bootloader

Disable all the outbound windows to avoid one transaction hitting multiple
outbound windows.  dw_pcie_setup_rc() will reconfigure the outbound
windows, which may conflict with windows configured by the bootloader.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Roy Zang <tie-fei.zang@freescale.com>

diff --git a/drivers/pci/dwc/pci-layerscape.c b/drivers/pci/dwc/pci-layerscape.c
index 27234da..a77f756 100644 (file)
--- a/drivers/pci/dwc/pci-layerscape.c
+++ b/drivers/pci/dwc/pci-layerscape.c
@@ -35,6 +35,8 @@
 #define PCIE_STRFMR1           0x71c /* Symbol Timer & Filter Mask Register1 */
 #define PCIE_DBI_RO_WR_EN      0x8bc /* DBI Read-Only Write Enable Register */
 
+#define PCIE_IATU_NUM          6
+
 struct ls_pcie_drvdata {
        u32 lut_offset;
        u32 ltssm_shift;
@@ -91,6 +93,14 @@ static void ls_pcie_drop_msg_tlp(struct ls_pcie *pcie)
        iowrite32(val, pci->dbi_base + PCIE_STRFMR1);
 }
 
+static void ls_pcie_disable_outbound_atus(struct ls_pcie *pcie)
+{
+       int i;
+
+       for (i = 0; i < PCIE_IATU_NUM; i++)
+               dw_pcie_disable_atu(pcie->pci, DW_PCIE_REGION_OUTBOUND, i);
+}
+
 static int ls1021_pcie_link_up(struct dw_pcie *pci)
 {
        u32 state;
@@ -128,6 +138,13 @@ static int ls_pcie_host_init(struct pcie_port *pp)
        struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
        struct ls_pcie *pcie = to_ls_pcie(pci);
 
+       /*
+        * Disable outbound windows configured by the bootloader to avoid
+        * one transaction hitting multiple outbound windows.
+        * dw_pcie_setup_rc() will reconfigure the outbound windows.
+        */
+       ls_pcie_disable_outbound_atus(pcie);
+
        iowrite32(1, pci->dbi_base + PCIE_DBI_RO_WR_EN);
        ls_pcie_fix_class(pcie);
        ls_pcie_clear_multifunction(pcie);