blob: e089d5f02f1ff7c473d90d884c4207ca99dbc49e [file] [log] [blame]
Marian Balakowicz78b123c2006-05-09 11:54:44 +02001/*
2 * (C) Copyright 2000-2006
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>
TsiChungLiewf28e1bd2007-08-15 20:32:06 -050025#include <asm/immap.h>
Marian Balakowicz78b123c2006-05-09 11:54:44 +020026
27int checkboard (void) {
28 puts ("Board: Freescale M5271EVB\n");
29 return 0;
30};
31
Becky Bruce9973e3c2008-06-09 16:03:40 -050032phys_size_t initdram (int board_type) {
Marian Balakowicz78b123c2006-05-09 11:54:44 +020033
34 int i;
35
36 /* Enable Address lines 23-21 and lower 16bits of data path */
37 mbar_writeByte(MCF_GPIO_PAR_AD, MCF_GPIO_AD_ADDR23 |
38 MCF_GPIO_AD_ADDR22 | MCF_GPIO_AD_ADDR21 |
39 MCF_GPIO_AD_DATAL);
40
41 /* Set CS2 pin to be SD_CS0 */
42 mbar_writeByte(MCF_GPIO_PAR_CS, mbar_readByte(MCF_GPIO_PAR_CS)
43 | MCF_GPIO_PAR_CS_PAR_CS2);
44
45 /* Configure SDRAM Control Pin Assignemnt Register */
46 mbar_writeByte(MCF_GPIO_PAR_SDRAM, MCF_GPIO_SDRAM_CSSDCS_00 |
47 MCF_GPIO_SDRAM_SDWE | MCF_GPIO_SDRAM_SCAS |
48 MCF_GPIO_SDRAM_SRAS | MCF_GPIO_SDRAM_SCKE |
49 MCF_GPIO_SDRAM_SDCS_11);
50
51 /*
52 * Check to see if the SDRAM has already been initialized
53 * by a run control tool
54 */
Wolfgang Denk977b50f2006-05-10 17:43:20 +020055 if (!(mbar_readLong(MCF_SDRAMC_DACR0) & MCF_SDRAMC_DACRn_RE)) {
Marian Balakowicz78b123c2006-05-09 11:54:44 +020056 /* Initialize DRAM Control Register: DCR */
Wolfgang Denk977b50f2006-05-10 17:43:20 +020057 mbar_writeShort(MCF_SDRAMC_DCR,
Marian Balakowicz78b123c2006-05-09 11:54:44 +020058 MCF_SDRAMC_DCR_RTIM(0x01)
59 | MCF_SDRAMC_DCR_RC(0x30));
60
61 /*
62 * Initialize DACR0
63 *
64 * CASL: 01
65 * CBM: cmd at A20, bank select bits 21 and up
66 * PS: 32bit port size
67 */
68 mbar_writeLong(MCF_SDRAMC_DACR0,
69 MCF_SDRAMC_DACRn_BA(CFG_SDRAM_BASE>>18)
70 | MCF_SDRAMC_DACRn_CASL(1)
71 | MCF_SDRAMC_DACRn_CBM(3)
72 | MCF_SDRAMC_DACRn_PS(0));
73
74 /* Initialize DMR0 */
Wolfgang Denk977b50f2006-05-10 17:43:20 +020075 mbar_writeLong(MCF_SDRAMC_DMR0,
Marian Balakowicz78b123c2006-05-09 11:54:44 +020076 MCF_SDRAMC_DMRn_BAM_16M
77 | MCF_SDRAMC_DMRn_V);
78
79 /* Set IP bit in DACR */
80 mbar_writeLong(MCF_SDRAMC_DACR0, mbar_readLong(MCF_SDRAMC_DACR0)
81 | MCF_SDRAMC_DACRn_IP);
82
83 /* Wait at least 20ns to allow banks to precharge */
84 for (i = 0; i < 5; i++)
85 asm(" nop");
86
87 /* Write to this block to initiate precharge */
88 *(u32 *)(CFG_SDRAM_BASE) = 0xa5a5a5a5;
89
90 /* Set RE bit in DACR */
91 mbar_writeLong(MCF_SDRAMC_DACR0, mbar_readLong(MCF_SDRAMC_DACR0)
92 | MCF_SDRAMC_DACRn_RE);
93
94 /* Wait for at least 8 auto refresh cycles to occur */
95 for (i = 0; i < 2000; i++)
96 asm(" nop");
97
98 /* Finish the configuration by issuing the MRS */
99 mbar_writeLong(MCF_SDRAMC_DACR0, mbar_readLong(MCF_SDRAMC_DACR0)
100 | MCF_SDRAMC_DACRn_MRS);
101
102 /*
103 * Write to the SDRAM Mode Register A0-A11 = 0x400
104 *
105 * Write Burst Mode = Programmed Burst Length
106 * Op Mode = Standard Op
107 * CAS Latency = 2
108 * Burst Type = Sequential
109 * Burst Length = 1
110 */
111 *(u32 *)(CFG_SDRAM_BASE + 0x400) = 0xa5a5a5a5;
112 }
113
114 return CFG_SDRAM_SIZE * 1024 * 1024;
115};
116
117int testdram (void) {
118
119 /* TODO: XXX XXX XXX */
120 printf ("DRAM test not implemented!\n");
121
122 return (0);
123}