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 #include <linux/config.h>
  19
  20 #ifdef CONFIG_ROCKHOPPER
  21 #include <asm/io.h>
  22 #include <linux/pci.h>
  23
  24 #define PCICONFDREG     0xaf000c14
  25 #define PCICONFAREG     0xaf000c18
  26
  27 void disable_pcnet(void)
  28 {
  29         u32 data;
  30
  31         /*
  32          * Workaround for the bug in PMON on VR4133. PMON leaves
  33          * AMD PCNet controller (on Rockhopper) initialized and running in
  34          * bus master mode. We have do disable it before doing any
  35          * further initialization. Or we get problems with PCI bus 2
  36          * and random lockups and crashes.
  37          */
  38
  39         writel((2 << 16)                |
  40                (PCI_DEVFN(1,0) << 8)    |
  41                (0 & 0xfc)               |
  42                1UL,
  43                PCICONFAREG);
  44
  45         data = readl(PCICONFDREG);
  46
  47         writel((2 << 16)                |
  48                (PCI_DEVFN(1,0) << 8)    |
  49                (4 & 0xfc)               |
  50                1UL,
  51                PCICONFAREG);
  52
  53         data = readl(PCICONFDREG);
  54
  55         writel((2 << 16)                |
  56                (PCI_DEVFN(1,0) << 8)    |
  57                (4 & 0xfc)               |
  58                1UL,
  59                PCICONFAREG);
  60
  61         data &= ~4;
  62
  63         writel(data, PCICONFDREG);
  64 }
  65 #endif
  66