76 строки
2.3 KiB
C
76 строки
2.3 KiB
C
/*
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* common tx4927 memory interface
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*
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* Author: MontaVista Software, Inc.
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* source@mvista.com
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*
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* Copyright 2001-2002 MontaVista Software Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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* USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/io.h>
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#include <asm/txx9/tx4927.h>
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static unsigned int __init tx4927_process_sdccr(u64 __iomem *addr)
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{
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u64 val;
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unsigned int sdccr_ce;
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unsigned int sdccr_bs;
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unsigned int sdccr_rs;
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unsigned int sdccr_cs;
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unsigned int sdccr_mw;
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unsigned int bs = 0;
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unsigned int rs = 0;
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unsigned int cs = 0;
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unsigned int mw = 0;
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val = __raw_readq(addr);
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/* MVMCP -- need #defs for these bits masks */
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sdccr_ce = ((val & (1 << 10)) >> 10);
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sdccr_bs = ((val & (1 << 8)) >> 8);
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sdccr_rs = ((val & (3 << 5)) >> 5);
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sdccr_cs = ((val & (7 << 2)) >> 2);
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sdccr_mw = ((val & (1 << 0)) >> 0);
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if (sdccr_ce) {
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bs = 2 << sdccr_bs;
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rs = 2048 << sdccr_rs;
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cs = 256 << sdccr_cs;
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mw = 8 >> sdccr_mw;
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}
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return rs * cs * mw * bs;
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}
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unsigned int __init tx4927_get_mem_size(void)
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{
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unsigned int total = 0;
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int i;
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for (i = 0; i < ARRAY_SIZE(tx4927_sdramcptr->cr); i++)
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total += tx4927_process_sdccr(&tx4927_sdramcptr->cr[i]);
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return total;
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}
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