pci: ls_pcie_g4: Add size check for config resource

resource "config" is required to have minimum 4KB space
to access all config space of PCI Express EP.

Signed-off-by: Wasim Khan <wasim.khan@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>

diff --git a/drivers/pci/pcie_layerscape_gen4.c b/drivers/pci/pcie_layerscape_gen4.c
index 0226bde678dbb10e8f60f9a841037b8651ba5286..6e71173621f58fb55d94e2b3cffd62f34e3edaef 100644 (file)
--- a/drivers/pci/pcie_layerscape_gen4.c
+++ b/drivers/pci/pcie_layerscape_gen4.c
@@ -455,6 +455,7 @@ static int ls_pcie_g4_probe(struct udevice *dev)
        u32 link_ctrl_sta;
        u32 val;
        int ret;
+       fdt_size_t cfg_size;
 
        pcie->bus = dev;
 
@@ -488,6 +489,13 @@ static int ls_pcie_g4_probe(struct udevice *dev)
                return ret;
        }
 
+       cfg_size = fdt_resource_size(&pcie->cfg_res);
+       if (cfg_size < SZ_4K) {
+               printf("PCIe%d: %s Invalid size(0x%llx) for resource \"config\",expected minimum 0x%x\n",
+                      PCIE_SRDS_PRTCL(pcie->idx), dev->name, cfg_size, SZ_4K);
+               return 0;
+       }
+
        pcie->cfg = map_physmem(pcie->cfg_res.start,
                                fdt_resource_size(&pcie->cfg_res),
                                MAP_NOCACHE);