ehci-fsl: fix cache coherency problem on system with large memory

[powerpc.git] / drivers / usb / host / ehci-fsl.c

diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index a524805..c7a7c59 100644 (file)
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -193,6 +193,19 @@ static void mpc83xx_usb_setup(struct usb_hcd *hcd)
        out_be32(non_ehci + FSL_SOC_USB_CTRL, 0x00000004);
        out_be32(non_ehci + FSL_SOC_USB_SNOOP1, 0x0000001b);
 
+#if defined(CONFIG_PPC32) && !defined(CONFIG_NOT_COHERENT_CACHE)
+       /*
+        * Turn on cache snooping hardware, since some PowerPC platforms
+        * wholly rely on hardware to deal with cache coherent
+        */
+
+       /* Setup Snooping for all the 4GB space */
+       /* SNOOP1 starts from 0x0, size 2G */
+       out_be32(non_ehci + FSL_SOC_USB_SNOOP1, 0x0 | SNOOP_SIZE_2GB);
+       /* SNOOP2 starts from 0x80000000, size 2G */
+       out_be32(non_ehci + FSL_SOC_USB_SNOOP2, 0x80000000 | SNOOP_SIZE_2GB);
+#endif
+
        if (pdata->operating_mode == FSL_USB2_DR_HOST)
                mpc83xx_setup_phy(ehci, pdata->phy_mode, 0);