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
35 static 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
67 unsigned 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 }