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wdenk354bc6f2002-08-26 21:53:16 +00001/*
2 * (C) Copyright 2001
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>
25#include <mpc8xx.h>
26
27/* ------------------------------------------------------------------------- */
28
29static long int dram_size (long int, long int *, long int);
30
31/* ------------------------------------------------------------------------- */
32
33#define _NOT_USED_ 0xFFFFFFFF
34
35const uint sdram_table[] =
36{
37 /*
38 * Single Read. (Offset 0 in UPMA RAM)
39 */
40 0x1F07FC04, 0xEEAEFC04, 0x11ADFC04, 0xEFBBBC00,
41 0x1FF77C47, /* last */
42 /*
43 * SDRAM Initialization (offset 5 in UPMA RAM)
44 *
45 * This is no UPM entry point. The following definition uses
46 * the remaining space to establish an initialization
47 * sequence, which is executed by a RUN command.
48 *
49 */
50 0x1FF77C34, 0xEFEABC34, 0x1FB57C35, /* last */
51 /*
52 * Burst Read. (Offset 8 in UPMA RAM)
53 */
54 0x1F07FC04, 0xEEAEFC04, 0x10ADFC04, 0xF0AFFC00,
55 0xF0AFFC00, 0xF1AFFC00, 0xEFBBBC00, 0x1FF77C47, /* last */
56 _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
57 _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
58 /*
59 * Single Write. (Offset 18 in UPMA RAM)
60 */
61 0x1F07FC04, 0xEEAEBC00, 0x01B93C04, 0x1FF77C47, /* last */
62 _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
63 /*
64 * Burst Write. (Offset 20 in UPMA RAM)
65 */
66 0x1F07FC04, 0xEEAEBC00, 0x10AD7C00, 0xF0AFFC00,
67 0xF0AFFC00, 0xE1BBBC04, 0x1FF77C47, /* last */
68 _NOT_USED_,
69 _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
70 _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
71 /*
72 * Refresh (Offset 30 in UPMA RAM)
73 */
74 0x1FF5FC84, 0xFFFFFC04, 0xFFFFFC04, 0xFFFFFC04,
75 0xFFFFFC84, 0xFFFFFC07, /* last */
76 _NOT_USED_, _NOT_USED_,
77 _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
78 /*
79 * Exception. (Offset 3c in UPMA RAM)
80 */
81 0x7FFFFC07, /* last */
82 _NOT_USED_, _NOT_USED_, _NOT_USED_,
83};
84
85/* ------------------------------------------------------------------------- */
86
87
88/*
89 * Check Board Identity:
90 */
91
92int checkboard (void)
93{
94 unsigned char *s = getenv ("serial#");
95
96 puts ("Board: TTTech C2MON ");
97
98 for (; s && *s; ++s) {
99 if (*s == ' ')
100 break;
101 putc (*s);
102 }
103
104 putc ('\n');
105
106 return (0);
107}
108
109/* ------------------------------------------------------------------------- */
110
111long int initdram (int board_type)
112{
113 volatile immap_t *immap = (immap_t *) CFG_IMMR;
114 volatile memctl8xx_t *memctl = &immap->im_memctl;
115 unsigned long reg;
116 long int size8, size9;
117 long int size = 0;
118
119 upmconfig (UPMA, (uint *)sdram_table, sizeof(sdram_table) / sizeof(uint));
120
121 /*
122 * Preliminary prescaler for refresh (depends on number of
123 * banks): This value is selected for four cycles every 62.4 us
124 * with two SDRAM banks or four cycles every 31.2 us with one
125 * bank. It will be adjusted after memory sizing.
126 */
127 memctl->memc_mptpr = CFG_MPTPR_2BK_8K;
128
129 memctl->memc_mar = 0x00000088;
130
131 /*
132 * Map controller bank 2 the SDRAM bank 2 at physical address 0.
133 */
134 memctl->memc_or2 = CFG_OR2_PRELIM;
135 memctl->memc_br2 = CFG_BR2_PRELIM;
136
137 memctl->memc_mamr = CFG_MAMR_8COL & (~(MAMR_PTAE)); /* no refresh yet */
138
139 udelay (200);
140
141 /* perform SDRAM initializsation sequence */
142
143 memctl->memc_mcr = 0x80004105; /* SDRAM bank 0 */
144 udelay (1);
145 memctl->memc_mcr = 0x80004230; /* SDRAM bank 0 - execute twice */
146 udelay (1);
147
148 memctl->memc_mamr |= MAMR_PTAE; /* enable refresh */
149
150 udelay (1000);
151
152 /*
153 * Check Bank 0 Memory Size
154 *
155 * try 8 column mode
156 */
157 size8 = dram_size (CFG_MAMR_8COL,
158 (ulong *)SDRAM_BASE2_PRELIM,
159 SDRAM_MAX_SIZE);
160
161 udelay (1000);
162
163 /*
164 * try 9 column mode
165 */
166 size9 = dram_size (CFG_MAMR_9COL,
167 (ulong *) SDRAM_BASE2_PRELIM,
168 SDRAM_MAX_SIZE);
169
170 if (size8 < size9) { /* leave configuration at 9 columns */
171 size = size9;
172/* debug ("SDRAM Bank 0 in 9 column mode: %ld MB\n", size >> 20); */
173 } else { /* back to 8 columns */
174 size = size8;
175 memctl->memc_mamr = CFG_MAMR_8COL;
176 udelay (500);
177/* debug ("SDRAM Bank 0 in 8 column mode: %ld MB\n", size >> 20); */
178 }
179
180 udelay (1000);
181
182 /*
183 * Adjust refresh rate depending on SDRAM type
184 * For types > 128 MBit leave it at the current (fast) rate
185 */
186 if (size < 0x02000000) {
187 /* reduce to 15.6 us (62.4 us / quad) */
188 memctl->memc_mptpr = CFG_MPTPR_2BK_4K;
189 udelay (1000);
190 }
191
192 /*
193 * Final mapping
194 */
195 memctl->memc_or2 = ((-size) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM;
196 memctl->memc_br2 = (CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V;
197
198 /*
199 * No bank 1
200 *
201 * invalidate bank
202 */
203 memctl->memc_br3 = 0;
204
205 /* adjust refresh rate depending on SDRAM type, one bank */
206 reg = memctl->memc_mptpr;
207 reg >>= 1; /* reduce to CFG_MPTPR_1BK_8K / _4K */
208 memctl->memc_mptpr = reg;
209
210 udelay (10000);
211
212 return (size);
213}
214
215/* ------------------------------------------------------------------------- */
216
217/*
218 * Check memory range for valid RAM. A simple memory test determines
219 * the actually available RAM size between addresses `base' and
220 * `base + maxsize'. Some (not all) hardware errors are detected:
221 * - short between address lines
222 * - short between data lines
223 */
224
225static long int dram_size (long int mamr_value, long int *base,
226 long int maxsize)
227{
228 volatile immap_t *immap = (immap_t *) CFG_IMMR;
229 volatile memctl8xx_t *memctl = &immap->im_memctl;
wdenk354bc6f2002-08-26 21:53:16 +0000230
231 memctl->memc_mamr = mamr_value;
232
wdenkc83bf6a2004-01-06 22:38:14 +0000233 return (get_ram_size(base, maxsize));
wdenk354bc6f2002-08-26 21:53:16 +0000234}