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 | } |
76 | |