arch/mips/vr41xx/nec-cmbvr4133/init.c

   1 /*
   2  * arch/mips/vr41xx/nec-cmbvr4133/init.c
   3  *
   4  * PROM library initialisation code for NEC CMB-VR4133 board.
   5  *
   6  * Author: Yoichi Yuasa <yyuasa@mvista.com, or source@mvista.com> and
   7  *         Jun Sun <jsun@mvista.com, or source@mvista.com> and
   8  *         Alex Sapkov <asapkov@ru.mvista.com>
   9  *
  10  * 2001-2004 (c) MontaVista, Software, Inc. This file is licensed under
  11  * the terms of the GNU General Public License version 2. This program
  12  * is licensed "as is" without any warranty of any kind, whether express
  13  * or implied.
  14  *
  15  * Support for NEC-CMBVR4133 in 2.6
  16  * Manish Lachwani (mlachwani@mvista.com)
  17  */
  18
  19 #ifdef CONFIG_ROCKHOPPER
  20 #include <asm/io.h>
  21 #include <linux/pci.h>
  22
  23 #define PCICONFDREG     0xaf000c14
  24 #define PCICONFAREG     0xaf000c18
  25
  26 void disable_pcnet(void)
  27 {
  28         u32 data;
  29
  30         /*
  31          * Workaround for the bug in PMON on VR4133. PMON leaves
  32          * AMD PCNet controller (on Rockhopper) initialized and running in
  33          * bus master mode. We have do disable it before doing any
  34          * further initialization. Or we get problems with PCI bus 2
  35          * and random lockups and crashes.
  36          */
  37
  38         writel((2 << 16)                |
  39                (PCI_DEVFN(1, 0) << 8)   |
  40                (0 & 0xfc)               |
  41                1UL,
  42                PCICONFAREG);
  43
  44         data = readl(PCICONFDREG);
  45
  46         writel((2 << 16)                |
  47                (PCI_DEVFN(1, 0) << 8)   |
  48                (4 & 0xfc)               |
  49                1UL,
  50                PCICONFAREG);
  51
  52         data = readl(PCICONFDREG);
  53
  54         writel((2 << 16)                |
  55                (PCI_DEVFN(1, 0) << 8)   |
  56                (4 & 0xfc)               |
  57                1UL,
  58                PCICONFAREG);
  59
  60         data &= ~4;
  61
  62         writel(data, PCICONFDREG);
  63 }
  64 #endif
  65