Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*
 * This file contains low level CPU setup functions.
 * Valentine Barshak <vbarshak@ru.mvista.com>
 * MontaVista Software, Inc (c) 2007
 *
 * Based on cpu_setup_6xx code by 
 * Benjamin Herrenschmidt <benh@kernel.crashing.org>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 *
 */

#include <asm/processor.h>
#include <asm/cputable.h>
#include <asm/ppc_asm.h>

_GLOBAL(__setup_cpu_440ep)
        b       __init_fpu_44x
_GLOBAL(__setup_cpu_440epx)
        mflr    r4
        bl      __init_fpu_44x
        bl      __plb_disable_wrp
        mtlr    r4
        blr
_GLOBAL(__setup_cpu_440grx)
        b       __plb_disable_wrp


/* enable APU between CPU and FPU */
_GLOBAL(__init_fpu_44x)
        mfspr   r3,SPRN_CCR0
        /* Clear DAPUIB flag in CCR0 */
        rlwinm  r3,r3,0,12,10
        mtspr   SPRN_CCR0,r3
        isync
        blr

/*
 * Workaround for the incorrect write to DDR SDRAM errata.
 * The write address can be corrupted during writes to
 * DDR SDRAM when write pipelining is enabled on PLB0.
 * Disable write pipelining here.
 */
#define DCRN_PLB4A0_ACR 0x81

_GLOBAL(__plb_disable_wrp)
        mfdcr   r3,DCRN_PLB4A0_ACR
        /* clear WRP bit in PLB4A0_ACR */
        rlwinm  r3,r3,0,8,6
        mtdcr   DCRN_PLB4A0_ACR,r3
        isync
        blr