usb: PS3 EHCI HC reset work-around

PS3 EHCI HC errata fix 316 - The PS3 EHCI HC will reset its
internal INSNREGXX setup regs back to the chip default values
on Host Controller Reset (CMD_RESET) or Light Host Controller
Reset (CMD_LRESET).  The work-around for this is for the HC
driver to re-initialise these regs when ever the HC is reset.

Adds a new helper routine ps3_ehci_setup_insnreg() which is
called from ps3_ehci_hc_reset().

Signed-off-by: Geoff Levand <geoff@infradead.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>

drivers/usb/host/ehci-ps3.c

@@ -21,6 +21,34 @@
 #include <asm/firmware.h>
 #include <asm/ps3.h>
 
+static void ps3_ehci_setup_insnreg(struct ehci_hcd *ehci)
+{
+	/* PS3 HC internal setup register offsets. */
+
+	enum ps3_ehci_hc_insnreg {
+		ps3_ehci_hc_insnreg01 = 0x084,
+		ps3_ehci_hc_insnreg02 = 0x088,
+		ps3_ehci_hc_insnreg03 = 0x08c,
+	};
+
+	/* PS3 EHCI HC errata fix 316 - The PS3 EHCI HC will reset its
+	 * internal INSNREGXX setup regs back to the chip default values
+	 * on Host Controller Reset (CMD_RESET) or Light Host Controller
+	 * Reset (CMD_LRESET).  The work-around for this is for the HC
+	 * driver to re-initialise these regs when ever the HC is reset.
+	 */
+
+	/* Set burst transfer counts to 256 out, 32 in. */
+
+	writel_be(0x01000020, (void __iomem *)ehci->regs +
+		ps3_ehci_hc_insnreg01);
+
+	/* Enable burst transfer counts. */
+
+	writel_be(0x00000001, (void __iomem *)ehci->regs +
+		ps3_ehci_hc_insnreg03);
+}
+
 static int ps3_ehci_hc_reset(struct usb_hcd *hcd)
 {
 	int result;
@@ -49,6 +77,8 @@ static int ps3_ehci_hc_reset(struct usb_hcd *hcd)
 
 	ehci_reset(ehci);
 
+	ps3_ehci_setup_insnreg(ehci);
+
 	return result;
 }