diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index ce84805..0c23774 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -36,6 +36,10 @@
 #include <linux/pci.h>
 #include <linux/libata.h>
 
+#ifdef CONFIG_PPC_CHRP
+#include <asm/processor.h>
+#endif
+
 #include "libata.h"
 
 /**
@@ -1065,6 +1069,11 @@ int ata_pci_init_one(struct pci_dev *pdev,
 	if (rc)
 		goto err_out;
 
+#ifdef CONFIG_PPC_CHRP
+	if (machine_is(chrp) && _chrp_type == _CHRP_Pegasos)
+		legacy_mode = 1;
+#endif
+
 	if (!legacy_mode)
 		rc = devm_request_irq(dev, pdev->irq, pi->port_ops->irq_handler,
 				      IRQF_SHARED, DRV_NAME, host);