/* * 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