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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/mips/txx9/generic/mem_tx4927.c
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/*

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 * common tx4927 memory interface

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 *

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 * Author: MontaVista Software, Inc.

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 *         [email protected]

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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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