1/*
2 * common tx4927 memory interface
3 *
4 * Author: MontaVista Software, Inc.
5 *	   source@mvista.com
6 *
7 * Copyright 2001-2002 MontaVista Software Inc.
8 *
9 *  This program is free software; you can redistribute it and/or modify it
10 *  under the terms of the GNU General Public License as published by the
11 *  Free Software Foundation; either version 2 of the License, or (at your
12 *  option) any later version.
13 *
14 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
15 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
16 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
19 *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
20 *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21 *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
22 *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
23 *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 *  You should have received a copy of the GNU General Public License along
26 *  with this program; if not, write to the Free Software Foundation, Inc.,
27 *  675 Mass Ave, Cambridge, MA 02139, USA.
28 */
29
30#include <linux/init.h>
31#include <linux/types.h>
32#include <linux/io.h>
33#include <asm/txx9/tx4927.h>
34
35static unsigned int __init tx4927_process_sdccr(u64 __iomem *addr)
36{
37	u64 val;
38	unsigned int sdccr_ce;
39	unsigned int sdccr_bs;
40	unsigned int sdccr_rs;
41	unsigned int sdccr_cs;
42	unsigned int sdccr_mw;
43	unsigned int bs = 0;
44	unsigned int rs = 0;
45	unsigned int cs = 0;
46	unsigned int mw = 0;
47
48	val = __raw_readq(addr);
49
50	/* MVMCP -- need #defs for these bits masks */
51	sdccr_ce = ((val & (1 << 10)) >> 10);
52	sdccr_bs = ((val & (1 << 8)) >> 8);
53	sdccr_rs = ((val & (3 << 5)) >> 5);
54	sdccr_cs = ((val & (7 << 2)) >> 2);
55	sdccr_mw = ((val & (1 << 0)) >> 0);
56
57	if (sdccr_ce) {
58		bs = 2 << sdccr_bs;
59		rs = 2048 << sdccr_rs;
60		cs = 256 << sdccr_cs;
61		mw = 8 >> sdccr_mw;
62	}
63
64	return rs * cs * mw * bs;
65}
66
67unsigned int __init tx4927_get_mem_size(void)
68{
69	unsigned int total = 0;
70	int i;
71
72	for (i = 0; i < ARRAY_SIZE(tx4927_sdramcptr->cr); i++)
73		total += tx4927_process_sdccr(&tx4927_sdramcptr->cr[i]);
74	return total;
75}
76