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Bugzilla 1647. This patch resets PCI which fixes the USB problem on mcf5475.
Set PCI registers MCF_PCIGSCR and MCF_PCITCR to their reset defaults.
This fixes the USB problem and enables other PCI cards, such as PCI
network to function properly.
Original work of Matt Waddel
Signed-off-by: Ross Wille
--- a/arch/m68k/coldfire/mcf548x-pci.c
+++ b/arch/m68k/coldfire/mcf548x-pci.c
@@ -1,5 +1,23 @@
/*
* ColdFire 547x/548x PCI Host Controller functions
+ *
+ * Copyright (c) 2005-2008 Freescale Semiconductor, Inc.
+ *
+ * This code is based on the 2.6.10 version of pci.c
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/kernel.h>
#include <linux/types.h>
@@ -815,6 +833,13 @@ struct pci_bus_info *__init init_coldfir
return NULL;
}
+ /* Must Reset!!! If bootloader has PCI enabled, it will cause
+ * problem in linux when it tries to configure/find resources
+ * for the pci devices. Both registers need to be reset.
+ */
+ MCF_PCIGSCR = 0x1;
+ MCF_PCITCR = 0x00000000;
+
/* Set up the arbiter */
MCF_PCIARB_PACR = 0 /*MCF_PCIARB_PACR_PKMD*/
| MCF_PCIARB_PACR_INTMPRI
|
