Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=40acc095302aee380491df5f58d98945243468ec
Commit:     40acc095302aee380491df5f58d98945243468ec
Parent:     3d6ac9843175c1d29c075794519cb045b52e46c2
Author:     Li Yang <[EMAIL PROTECTED]>
AuthorDate: Wed May 23 13:58:17 2007 -0700
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Wed May 23 20:14:15 2007 -0700

    ehci-fsl: fix cache coherency problem on system with large memory
    
    The patch fixes bug http://bugzilla.kernel.org/show_bug.cgi?id=7482.
    
    It sets USB snooping on 4G space for PowerPC platforms without
    CONFIG_NOT_COHERENT_CACHE defined.
    
    Reported-by: Stefan Meyer <[EMAIL PROTECTED]>
    Signed-off-by: Li Yang <[EMAIL PROTECTED]>
    Cc: Greg KH <[EMAIL PROTECTED]>
    Cc: David Brownell <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
 drivers/usb/host/ehci-fsl.c |   13 +++++++++++++
 drivers/usb/host/ehci-fsl.h |    1 +
 2 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index a524805..c7a7c59 100644
--- 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);
 
diff --git a/drivers/usb/host/ehci-fsl.h b/drivers/usb/host/ehci-fsl.h
index f28736a..b5e59db 100644
--- a/drivers/usb/host/ehci-fsl.h
+++ b/drivers/usb/host/ehci-fsl.h
@@ -34,4 +34,5 @@
 #define FSL_SOC_USB_PRICTRL    0x40c   /* NOTE: big-endian */
 #define FSL_SOC_USB_SICTRL     0x410   /* NOTE: big-endian */
 #define FSL_SOC_USB_CTRL       0x500   /* NOTE: big-endian */
+#define SNOOP_SIZE_2GB         0x1e
 #endif                         /* _EHCI_FSL_H */
-
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