1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * common tx4927 memory interface
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Author: MontaVista Software, Inc.
5*4882a593Smuzhiyun * source@mvista.com
6*4882a593Smuzhiyun *
7*4882a593Smuzhiyun * Copyright 2001-2002 MontaVista Software Inc.
8*4882a593Smuzhiyun *
9*4882a593Smuzhiyun * This program is free software; you can redistribute it and/or modify it
10*4882a593Smuzhiyun * under the terms of the GNU General Public License as published by the
11*4882a593Smuzhiyun * Free Software Foundation; either version 2 of the License, or (at your
12*4882a593Smuzhiyun * option) any later version.
13*4882a593Smuzhiyun *
14*4882a593Smuzhiyun * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
15*4882a593Smuzhiyun * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
16*4882a593Smuzhiyun * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17*4882a593Smuzhiyun * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18*4882a593Smuzhiyun * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
19*4882a593Smuzhiyun * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
20*4882a593Smuzhiyun * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21*4882a593Smuzhiyun * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
22*4882a593Smuzhiyun * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
23*4882a593Smuzhiyun * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24*4882a593Smuzhiyun *
25*4882a593Smuzhiyun * You should have received a copy of the GNU General Public License along
26*4882a593Smuzhiyun * with this program; if not, write to the Free Software Foundation, Inc.,
27*4882a593Smuzhiyun * 675 Mass Ave, Cambridge, MA 02139, USA.
28*4882a593Smuzhiyun */
29*4882a593Smuzhiyun
30*4882a593Smuzhiyun #include <linux/init.h>
31*4882a593Smuzhiyun #include <linux/types.h>
32*4882a593Smuzhiyun #include <linux/io.h>
33*4882a593Smuzhiyun #include <asm/txx9/tx4927.h>
34*4882a593Smuzhiyun
tx4927_process_sdccr(u64 __iomem * addr)35*4882a593Smuzhiyun static unsigned int __init tx4927_process_sdccr(u64 __iomem *addr)
36*4882a593Smuzhiyun {
37*4882a593Smuzhiyun u64 val;
38*4882a593Smuzhiyun unsigned int sdccr_ce;
39*4882a593Smuzhiyun unsigned int sdccr_bs;
40*4882a593Smuzhiyun unsigned int sdccr_rs;
41*4882a593Smuzhiyun unsigned int sdccr_cs;
42*4882a593Smuzhiyun unsigned int sdccr_mw;
43*4882a593Smuzhiyun unsigned int bs = 0;
44*4882a593Smuzhiyun unsigned int rs = 0;
45*4882a593Smuzhiyun unsigned int cs = 0;
46*4882a593Smuzhiyun unsigned int mw = 0;
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun val = __raw_readq(addr);
49*4882a593Smuzhiyun
50*4882a593Smuzhiyun /* MVMCP -- need #defs for these bits masks */
51*4882a593Smuzhiyun sdccr_ce = ((val & (1 << 10)) >> 10);
52*4882a593Smuzhiyun sdccr_bs = ((val & (1 << 8)) >> 8);
53*4882a593Smuzhiyun sdccr_rs = ((val & (3 << 5)) >> 5);
54*4882a593Smuzhiyun sdccr_cs = ((val & (7 << 2)) >> 2);
55*4882a593Smuzhiyun sdccr_mw = ((val & (1 << 0)) >> 0);
56*4882a593Smuzhiyun
57*4882a593Smuzhiyun if (sdccr_ce) {
58*4882a593Smuzhiyun bs = 2 << sdccr_bs;
59*4882a593Smuzhiyun rs = 2048 << sdccr_rs;
60*4882a593Smuzhiyun cs = 256 << sdccr_cs;
61*4882a593Smuzhiyun mw = 8 >> sdccr_mw;
62*4882a593Smuzhiyun }
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun return rs * cs * mw * bs;
65*4882a593Smuzhiyun }
66*4882a593Smuzhiyun
tx4927_get_mem_size(void)67*4882a593Smuzhiyun unsigned int __init tx4927_get_mem_size(void)
68*4882a593Smuzhiyun {
69*4882a593Smuzhiyun unsigned int total = 0;
70*4882a593Smuzhiyun int i;
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun for (i = 0; i < ARRAY_SIZE(tx4927_sdramcptr->cr); i++)
73*4882a593Smuzhiyun total += tx4927_process_sdccr(&tx4927_sdramcptr->cr[i]);
74*4882a593Smuzhiyun return total;
75*4882a593Smuzhiyun }
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