tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * PPC440SP/PPC440SPe system library
3 *
4 * Matt Porter <mporter@kernel.crashing.org>
5 * Copyright 2002-2005 MontaVista Software Inc.
6 *
7 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
8 * Copyright (c) 2003, 2004 Zultys Technologies
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
14 *
15 */
16#include <linux/types.h>
17#include <linux/serial.h>
18
19#include <asm/param.h>
20#include <asm/ibm44x.h>
21#include <asm/mmu.h>
22#include <asm/machdep.h>
23#include <asm/time.h>
24#include <asm/ppc4xx_pic.h>
25
26/*
27 * Read the 440SP memory controller to get size of system memory.
28 */
29unsigned long __init ibm440sp_find_end_of_memory(void)
30{
31 u32 i;
32 u32 mem_size = 0;
33
34 /* Read two bank sizes and sum */
35 for (i=0; i< MQ0_NUM_BANKS; i++)
36 switch (mfdcr(DCRN_MQ0_BS0BAS + i) & MQ0_CONFIG_SIZE_MASK) {
37 case MQ0_CONFIG_SIZE_8M:
38 mem_size += PPC44x_MEM_SIZE_8M;
39 break;
40 case MQ0_CONFIG_SIZE_16M:
41 mem_size += PPC44x_MEM_SIZE_16M;
42 break;
43 case MQ0_CONFIG_SIZE_32M:
44 mem_size += PPC44x_MEM_SIZE_32M;
45 break;
46 case MQ0_CONFIG_SIZE_64M:
47 mem_size += PPC44x_MEM_SIZE_64M;
48 break;
49 case MQ0_CONFIG_SIZE_128M:
50 mem_size += PPC44x_MEM_SIZE_128M;
51 break;
52 case MQ0_CONFIG_SIZE_256M:
53 mem_size += PPC44x_MEM_SIZE_256M;
54 break;
55 case MQ0_CONFIG_SIZE_512M:
56 mem_size += PPC44x_MEM_SIZE_512M;
57 break;
58 case MQ0_CONFIG_SIZE_1G:
59 mem_size += PPC44x_MEM_SIZE_1G;
60 break;
61 case MQ0_CONFIG_SIZE_2G:
62 mem_size += PPC44x_MEM_SIZE_2G;
63 break;
64 default:
65 break;
66 }
67 return mem_size;
68}