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 #include <linux/init.h>
  20 #include <linux/kernel.h>
  21 #include <linux/string.h>
  22
  23 #include <asm/bootinfo.h>
  24
  25 #ifdef CONFIG_ROCKHOPPER
  26 #include <asm/io.h>
  27 #include <linux/pci.h>
  28
  29 #define PCICONFDREG     0xaf000c14
  30 #define PCICONFAREG     0xaf000c18
  31 #endif
  32
  33 const char *get_system_type(void)
  34 {
  35         return "NEC CMB-VR4133";
  36 }
  37
  38 #ifdef CONFIG_ROCKHOPPER
  39 void disable_pcnet(void)
  40 {
  41         u32 data;
  42
  43         /*
  44          * Workaround for the bug in PMON on VR4133. PMON leaves
  45          * AMD PCNet controller (on Rockhopper) initialized and running in
  46          * bus master mode. We have do disable it before doing any
  47          * further initialization. Or we get problems with PCI bus 2
  48          * and random lockups and crashes.
  49          */
  50
  51         writel((2 << 16)                |
  52                (PCI_DEVFN(1,0) << 8)    |
  53                (0 & 0xfc)               |
  54                1UL,
  55                PCICONFAREG);
  56
  57         data = readl(PCICONFDREG);
  58
  59         writel((2 << 16)                |
  60                (PCI_DEVFN(1,0) << 8)    |
  61                (4 & 0xfc)               |
  62                1UL,
  63                PCICONFAREG);
  64
  65         data = readl(PCICONFDREG);
  66
  67         writel((2 << 16)                |
  68                (PCI_DEVFN(1,0) << 8)    |
  69                (4 & 0xfc)               |
  70                1UL,
  71                PCICONFAREG);
  72
  73         data &= ~4;
  74
  75         writel(data, PCICONFDREG);
  76 }
  77 #endif
  78