blob: 50e5e77368651498f5209438bc4984d5505c6bba [file] [log] [blame]
wdenkabf7a7c2003-12-08 01:34:36 +00001/*
2 * (C) Copyright 2000-2003
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 *
5 * See file CREDITS for list of people who contributed to this
6 * project.
7 *
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of
11 * the License, or (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21 * MA 02111-1307 USA
22 */
23
24#include <common.h>
TsiChungLiew1692b482007-08-15 20:32:06 -050025#include <asm/immap.h>
26
27DECLARE_GLOBAL_DATA_PTR;
wdenkabf7a7c2003-12-08 01:34:36 +000028
29int checkboard (void)
30{
TsiChungLiew1692b482007-08-15 20:32:06 -050031 puts ("Board: Freescale M5282EVB Evaluation Board\n");
wdenkabf7a7c2003-12-08 01:34:36 +000032 return 0;
33}
34
Becky Brucebd99ae72008-06-09 16:03:40 -050035phys_size_t initdram (int board_type)
wdenkabf7a7c2003-12-08 01:34:36 +000036{
TsiChungLiew1692b482007-08-15 20:32:06 -050037 u32 dramsize, i, dramclk;
38
39 dramsize = CFG_SDRAM_SIZE * 0x100000;
40 for (i = 0x13; i < 0x20; i++) {
41 if (dramsize == (1 << i))
42 break;
43 }
44 i--;
45
46 if (!(MCFSDRAMC_DACR0 & MCFSDRAMC_DACR_RE))
47 {
48 dramclk = gd->bus_clk / (CFG_HZ * CFG_HZ);
49
50 /* Initialize DRAM Control Register: DCR */
51 MCFSDRAMC_DCR = (0
52 | MCFSDRAMC_DCR_RTIM_6
53 | MCFSDRAMC_DCR_RC((15 * dramclk)>>4));
54
55 /* Initialize DACR0 */
56 MCFSDRAMC_DACR0 = (0
57 | MCFSDRAMC_DACR_BASE(CFG_SDRAM_BASE)
58 | MCFSDRAMC_DACR_CASL(1)
59 | MCFSDRAMC_DACR_CBM(3)
60 | MCFSDRAMC_DACR_PS_32);
61
62 /* Initialize DMR0 */
63 MCFSDRAMC_DMR0 = (0
64 | ((dramsize - 1) & 0xFFFC0000)
65 | MCFSDRAMC_DMR_V);
66
67 /* Set IP (bit 3) in DACR */
68 MCFSDRAMC_DACR0 |= MCFSDRAMC_DACR_IP;
69
70 /* Wait 30ns to allow banks to precharge */
71 for (i = 0; i < 5; i++) {
72 asm ("nop");
73 }
74
75 /* Write to this block to initiate precharge */
76 *(u32 *)(CFG_SDRAM_BASE) = 0xA5A59696;
77
78 /* Set RE (bit 15) in DACR */
79 MCFSDRAMC_DACR0 |= MCFSDRAMC_DACR_RE;
80
81 /* Wait for at least 8 auto refresh cycles to occur */
82 for (i = 0; i < 2000; i++) {
83 asm(" nop");
84 }
85
86 /* Finish the configuration by issuing the IMRS. */
87 MCFSDRAMC_DACR0 |= MCFSDRAMC_DACR_IMRS;
88
89 /* Write to the SDRAM Mode Register */
90 *(u32 *)(CFG_SDRAM_BASE + 0x400) = 0xA5A59696;
91 }
TsiChungLiew5bffcad2007-10-25 17:09:17 -050092 return dramsize;
wdenkabf7a7c2003-12-08 01:34:36 +000093}