1 files changed, 6 insertions, 0 deletions

diff --git a/arch/powerpc/sysdev/fsl_rio.c b/arch/powerpc/sysdev/fsl_rio.c
index d2d14708e714..14c106cf4aa2 100644
--- a/arch/powerpc/sysdev/fsl_rio.c
+++ b/arch/powerpc/sysdev/fsl_rio.c
@@ -1007,6 +1007,12 @@ int fsl_rio_setup(struct of_device *dev)
         rio_register_mport(port);
 
         priv->regs_win = ioremap(regs.start, regs.end - regs.start + 1);
+
+        port->sys_size = (in_be32((priv->regs_win + RIO_PEF_CAR))
+                                        & RIO_PEF_CTLS) >> 4;
+        dev_info(&dev->dev, "RapidIO Common Transport System size: %d\n",
+                        port->sys_size ? 65536 : 256);
+
         priv->atmu_regs = (struct rio_atmu_regs *)(priv->regs_win
                                         + RIO_ATMU_REGS_OFFSET);
         priv->maint_atmu_regs = priv->atmu_regs + 1;