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wdenkeee810b2002-10-16 11:27:53 +00001/*
2 * (C) Copyright 2001-2002
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 * Always return 1 (no second DRAM bank).
92 */
93
94int checkboard (void)
95{
96 unsigned char *s = getenv ("serial#");
97
98 puts ("Board: RRvision ");
99
100 for (; s && *s; ++s) {
101 if (*s == ' ')
102 break;
103 putc (*s);
104 }
105
106 putc ('\n');
107
108 return (0);
109}
110
111/* ------------------------------------------------------------------------- */
112
113long int initdram (int board_type)
114{
115 volatile immap_t *immap = (immap_t *) CFG_IMMR;
116 volatile memctl8xx_t *memctl = &immap->im_memctl;
117 unsigned long reg;
118 long int size8, size9;
119 long int size = 0;
120
121 upmconfig (UPMA, (uint *)sdram_table, sizeof(sdram_table) / sizeof(uint));
122
123 /*
124 * Preliminary prescaler for refresh (depends on number of
125 * banks): This value is selected for four cycles every 62.4 us
126 * with two SDRAM banks or four cycles every 31.2 us with one
127 * bank. It will be adjusted after memory sizing.
128 */
129 memctl->memc_mptpr = CFG_MPTPR_2BK_8K;
130
131 memctl->memc_mar = 0x00000088;
132
133 /*
134 * Map controller bank 1 the SDRAM bank 2 at physical address 0.
135 */
136 memctl->memc_or1 = CFG_OR2_PRELIM;
137 memctl->memc_br1 = CFG_BR2_PRELIM;
138
139 memctl->memc_mamr = CFG_MAMR_8COL & (~(MAMR_PTAE)); /* no refresh yet */
140
141 udelay (200);
142
143 /* perform SDRAM initializsation sequence */
144
145 memctl->memc_mcr = 0x80002105; /* SDRAM bank 0 */
146 udelay (1);
147 memctl->memc_mcr = 0x80002230; /* SDRAM bank 0 - execute twice */
148 udelay (1);
149
150 memctl->memc_mamr |= MAMR_PTAE; /* enable refresh */
151
152 udelay (1000);
153
154 /*
155 * Check Bank 0 Memory Size
156 *
157 * try 8 column mode
158 */
159 size8 = dram_size (CFG_MAMR_8COL,
160 (ulong *)SDRAM_BASE2_PRELIM,
161 SDRAM_MAX_SIZE);
162
163 udelay (1000);
164
165 /*
166 * try 9 column mode
167 */
168 size9 = dram_size (CFG_MAMR_9COL,
169 (ulong *) SDRAM_BASE2_PRELIM,
170 SDRAM_MAX_SIZE);
171
172 if (size8 < size9) { /* leave configuration at 9 columns */
173 size = size9;
174/* debug ("SDRAM Bank 0 in 9 column mode: %ld MB\n", size >> 20); */
175 } else { /* back to 8 columns */
176 size = size8;
177 memctl->memc_mamr = CFG_MAMR_8COL;
178 udelay (500);
179/* debug ("SDRAM Bank 0 in 8 column mode: %ld MB\n", size >> 20); */
180 }
181
182 udelay (1000);
183
184 /*
185 * Adjust refresh rate depending on SDRAM type
186 * For types > 128 MBit leave it at the current (fast) rate
187 */
188 if (size < 0x02000000) {
189 /* reduce to 15.6 us (62.4 us / quad) */
190 memctl->memc_mptpr = CFG_MPTPR_2BK_4K;
191 udelay (1000);
192 }
193
194 /*
195 * Final mapping
196 */
197 memctl->memc_or1 = ((-size) & 0xFFFF0000) | CFG_OR_TIMING_SDRAM;
198 memctl->memc_br1 = (CFG_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V;
199
200 /*
201 * No bank 1
202 *
203 * invalidate bank
204 */
205 memctl->memc_br3 = 0;
206
207 /* adjust refresh rate depending on SDRAM type, one bank */
208 reg = memctl->memc_mptpr;
209 reg >>= 1; /* reduce to CFG_MPTPR_1BK_8K / _4K */
210 memctl->memc_mptpr = reg;
211
212 udelay (10000);
213
214 return (size);
215}
216
217/* ------------------------------------------------------------------------- */
218
219/*
220 * Check memory range for valid RAM. A simple memory test determines
221 * the actually available RAM size between addresses `base' and
222 * `base + maxsize'. Some (not all) hardware errors are detected:
223 * - short between address lines
224 * - short between data lines
225 */
226
227static long int dram_size (long int mamr_value, long int *base,
228 long int maxsize)
229{
230 volatile immap_t *immap = (immap_t *) CFG_IMMR;
231 volatile memctl8xx_t *memctl = &immap->im_memctl;
232 volatile long int *addr;
233 ulong cnt, val;
234 ulong save[32]; /* to make test non-destructive */
235 unsigned char i = 0;
236
237 memctl->memc_mamr = mamr_value;
238
239 for (cnt = maxsize / sizeof (long); cnt > 0; cnt >>= 1) {
240 addr = base + cnt; /* pointer arith! */
241
242 save[i++] = *addr;
243 *addr = ~cnt;
244 }
245
246 /* write 0 to base address */
247 addr = base;
248 save[i] = *addr;
249 *addr = 0;
250
251 /* check at base address */
252 if ((val = *addr) != 0) {
253 *addr = save[i];
254 return (0);
255 }
256
257 for (cnt = 1; cnt <= maxsize / sizeof (long); cnt <<= 1) {
258 addr = base + cnt; /* pointer arith! */
259
260 val = *addr;
261 *addr = save[--i];
262
263 if (val != (~cnt)) {
264 return (cnt * sizeof (long));
265 }
266 }
267 return (maxsize);
268}