diff options
Diffstat (limited to 'target/linux/coldfire/patches/089-m547x_8x_pci_reset_usb_fix.patch')
| -rw-r--r-- | target/linux/coldfire/patches/089-m547x_8x_pci_reset_usb_fix.patch | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/target/linux/coldfire/patches/089-m547x_8x_pci_reset_usb_fix.patch b/target/linux/coldfire/patches/089-m547x_8x_pci_reset_usb_fix.patch new file mode 100644 index 0000000000..79a1e3930e --- /dev/null +++ b/target/linux/coldfire/patches/089-m547x_8x_pci_reset_usb_fix.patch @@ -0,0 +1,49 @@ +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 |