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: NStefan Meyer <reyems@telkomsa.net>
Signed-off-by: NLi Yang <leoli@freescale.com>
Cc: Greg KH <greg@kroah.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

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);
 

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 */