target/linux/coldfire/patches/089-m547x_8x_pci_reset_usb_fix.patch

   1 Bugzilla 1647. This patch resets PCI which fixes the USB problem on mcf5475.
   2
   3 Set PCI registers MCF_PCIGSCR and MCF_PCITCR to their reset defaults.
   4 This fixes the USB problem and enables other PCI cards, such as PCI
   5 network to function properly.
   6
   7 Original work of Matt Waddel
   8 Signed-off-by: Ross Wille
   9
  10 --- a/arch/m68k/coldfire/mcf548x-pci.c
  11 +++ b/arch/m68k/coldfire/mcf548x-pci.c
  12 @@ -1,5 +1,23 @@
  13  /*
  14   *     ColdFire 547x/548x PCI Host Controller functions
  15 + *
  16 + * Copyright (c) 2005-2008 Freescale Semiconductor, Inc.
  17 + *
  18 + * This code is based on the 2.6.10 version of pci.c
  19 + *
  20 + * This program is free software; you can redistribute it and/or modify
  21 + * it under the terms of the GNU General Public License as published by
  22 + * the Free Software Foundation; either version 2 of the License, or
  23 + * (at your option) any later version.
  24 + *
  25 + * This program is distributed in the hope that it will be useful,
  26 + * but WITHOUT ANY WARRANTY; without even the implied warranty of
  27 + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28 + * GNU General Public License for more details.
  29 + *
  30 + * You should have received a copy of the GNU General Public License
  31 + * along with this program; if not, write to the Free Software
  32 + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  33   */
  34  #include <linux/kernel.h>
  35  #include <linux/types.h>
  36 @@ -815,6 +833,13 @@ struct pci_bus_info *__init init_coldfir
  37                 return NULL;
  38         }
  39
  40 +       /* Must Reset!!! If bootloader has PCI enabled, it will cause
  41 +        * problem in linux when it tries to configure/find resources
  42 +        * for the pci devices.  Both registers need to be reset.
  43 +        */
  44 +       MCF_PCIGSCR = 0x1;
  45 +       MCF_PCITCR = 0x00000000;
  46 +
  47         /* Set up the arbiter */
  48         MCF_PCIARB_PACR = 0 /*MCF_PCIARB_PACR_PKMD*/
  49                         | MCF_PCIARB_PACR_INTMPRI