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init.c

/*
 * arch/mips/vr41xx/nec-cmbvr4133/init.c
 *
 * PROM library initialisation code for NEC CMB-VR4133 board.
 *
 * Author: Yoichi Yuasa <yyuasa@mvista.com, or source@mvista.com> and
 *         Jun Sun <jsun@mvista.com, or source@mvista.com> and
 *         Alex Sapkov <asapkov@ru.mvista.com>
 *
 * 2001-2004 (c) MontaVista, Software, Inc. This file is licensed under
 * the terms of the GNU General Public License version 2. This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 *
 * Support for NEC-CMBVR4133 in 2.6
 * Manish Lachwani (mlachwani@mvista.com)
 */

#ifdef CONFIG_ROCKHOPPER
#include <asm/io.h>
#include <linux/pci.h>

#define PCICONFDREG     0xaf000c14
#define PCICONFAREG     0xaf000c18

void disable_pcnet(void)
{
      u32 data;

      /*
       * Workaround for the bug in PMON on VR4133. PMON leaves
       * AMD PCNet controller (on Rockhopper) initialized and running in
       * bus master mode. We have do disable it before doing any
       * further initialization. Or we get problems with PCI bus 2
       * and random lockups and crashes.
       */

      writel((2 << 16)        |
             (PCI_DEVFN(1, 0) << 8) |
             (0 & 0xfc)       |
               1UL,
             PCICONFAREG);

      data = readl(PCICONFDREG);

      writel((2 << 16)        |
             (PCI_DEVFN(1, 0) << 8) |
             (4 & 0xfc)       |
               1UL,
             PCICONFAREG);

      data = readl(PCICONFDREG);

      writel((2 << 16)        |
             (PCI_DEVFN(1, 0) << 8) |
             (4 & 0xfc)       |
               1UL,
             PCICONFAREG);

      data &= ~4;

      writel(data, PCICONFDREG);
}
#endif


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