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/*
* 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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