USB: Implement support for EHCI with big endian MMIO

This patch implements supports for EHCI controllers whose MMIO
registers are big endian and enables that functionality for
the Toshiba SCC chip. It does _not_ add support for big endian
in-memory data structures as this is not needed for that chip
and I hope it will never be.

The guts of the patch are to convert readl(...) to
ehci_readl(ehci, ...) and similarly for register writes.

Signed-off-by: Kou Ishizaki <kou.ishizaki@toshiba.co.jp>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Geoff Levand <geoffrey.levand@am.sony.com>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 9 insertions, 7 deletions

diff --git a/drivers/usb/host/ehci-q.c b/drivers/usb/host/ehci-q.c
index 62e46dc60e86..e7fbbd00e7cd 100644
--- a/drivers/usb/host/ehci-q.c
+++ b/drivers/usb/host/ehci-q.c
@@ -789,13 +789,14 @@ static void qh_link_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
 	head = ehci->async;
 	timer_action_done (ehci, TIMER_ASYNC_OFF);
 	if (!head->qh_next.qh) {
-		u32	cmd = readl (&ehci->regs->command);
+		u32	cmd = ehci_readl(ehci, &ehci->regs->command);
 
 		if (!(cmd & CMD_ASE)) {
 			/* in case a clear of CMD_ASE didn't take yet */
-			(void) handshake (&ehci->regs->status, STS_ASS, 0, 150);
+			(void)handshake(ehci, &ehci->regs->status,
+					STS_ASS, 0, 150);
 			cmd |= CMD_ASE | CMD_RUN;
-			writel (cmd, &ehci->regs->command);
+			ehci_writel(ehci, cmd, &ehci->regs->command);
 			ehci_to_hcd(ehci)->state = HC_STATE_RUNNING;
 			/* posted write need not be known to HC yet ... */
 		}
@@ -1007,7 +1008,7 @@ static void end_unlink_async (struct ehci_hcd *ehci)
 
 static void start_unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
 {
-	int		cmd = readl (&ehci->regs->command);
+	int		cmd = ehci_readl(ehci, &ehci->regs->command);
 	struct ehci_qh	*prev;
 
 #ifdef DEBUG
@@ -1025,7 +1026,8 @@ static void start_unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
 		if (ehci_to_hcd(ehci)->state != HC_STATE_HALT
 				&& !ehci->reclaim) {
 			/* ... and CMD_IAAD clear */
-			writel (cmd & ~CMD_ASE, &ehci->regs->command);
+			ehci_writel(ehci, cmd & ~CMD_ASE,
+				    &ehci->regs->command);
 			wmb ();
 			// handshake later, if we need to
 			timer_action_done (ehci, TIMER_ASYNC_OFF);
@@ -1054,8 +1056,8 @@ static void start_unlink_async (struct ehci_hcd *ehci, struct ehci_qh *qh)
 
 	ehci->reclaim_ready = 0;
 	cmd |= CMD_IAAD;
-	writel (cmd, &ehci->regs->command);
-	(void) readl (&ehci->regs->command);
+	ehci_writel(ehci, cmd, &ehci->regs->command);
+	(void)ehci_readl(ehci, &ehci->regs->command);
 	timer_action (ehci, TIMER_IAA_WATCHDOG);
 }