2 * (C) Copyright 2001-2002
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * See file CREDITS for list of people who contributed to this
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.
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.
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,
27 /* ------------------------------------------------------------------------- */
29 static long int dram_size (long int, long int *, long int);
31 /* ------------------------------------------------------------------------- */
33 #define _NOT_USED_ 0xFFFFFFFF
35 const uint sdram_table[] =
38 * Single Read. (Offset 0 in UPMA RAM)
40 0x1F07FC04, 0xEEAEFC04, 0x11ADFC04, 0xEFBBBC00,
41 0x1FF77C47, /* last */
43 * SDRAM Initialization (offset 5 in UPMA RAM)
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.
50 0x1FF77C34, 0xEFEABC34, 0x1FB57C35, /* last */
52 * Burst Read. (Offset 8 in UPMA RAM)
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_,
59 * Single Write. (Offset 18 in UPMA RAM)
61 0x1F07FC04, 0xEEAEBC00, 0x01B93C04, 0x1FF77C47, /* last */
62 _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
64 * Burst Write. (Offset 20 in UPMA RAM)
66 0x1F07FC04, 0xEEAEBC00, 0x10AD7C00, 0xF0AFFC00,
67 0xF0AFFC00, 0xE1BBBC04, 0x1FF77C47, /* last */
69 _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
70 _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
72 * Refresh (Offset 30 in UPMA RAM)
74 0x1FF5FC84, 0xFFFFFC04, 0xFFFFFC04, 0xFFFFFC04,
75 0xFFFFFC84, 0xFFFFFC07, /* last */
76 _NOT_USED_, _NOT_USED_,
77 _NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
79 * Exception. (Offset 3c in UPMA RAM)
81 0x7FFFFC07, /* last */
82 _NOT_USED_, _NOT_USED_, _NOT_USED_,
85 /* ------------------------------------------------------------------------- */
89 * Check Board Identity:
91 * Always return 1 (no second DRAM bank).
96 char *s = getenv ("serial#");
98 puts ("Board: RRvision ");
100 for (; s && *s; ++s) {
111 /* ------------------------------------------------------------------------- */
113 long int initdram (int board_type)
115 volatile immap_t *immap = (immap_t *) CFG_IMMR;
116 volatile memctl8xx_t *memctl = &immap->im_memctl;
118 long int size8, size9;
121 upmconfig (UPMA, (uint *)sdram_table, sizeof(sdram_table) / sizeof(uint));
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.
129 memctl->memc_mptpr = CFG_MPTPR_2BK_8K;
131 memctl->memc_mar = 0x00000088;
134 * Map controller bank 1 the SDRAM bank 2 at physical address 0.
136 memctl->memc_or1 = CFG_OR2_PRELIM;
137 memctl->memc_br1 = CFG_BR2_PRELIM;
139 memctl->memc_mamr = CFG_MAMR_8COL & (~(MAMR_PTAE)); /* no refresh yet */
143 /* perform SDRAM initializsation sequence */
145 memctl->memc_mcr = 0x80002105; /* SDRAM bank 0 */
147 memctl->memc_mcr = 0x80002230; /* SDRAM bank 0 - execute twice */
150 memctl->memc_mamr |= MAMR_PTAE; /* enable refresh */
155 * Check Bank 0 Memory Size
159 size8 = dram_size (CFG_MAMR_8COL,
168 size9 = dram_size (CFG_MAMR_9COL,
172 if (size8 < size9) { /* leave configuration at 9 columns */
174 /* debug ("SDRAM Bank 0 in 9 column mode: %ld MB\n", size >> 20); */
175 } else { /* back to 8 columns */
177 memctl->memc_mamr = CFG_MAMR_8COL;
179 /* debug ("SDRAM Bank 0 in 8 column mode: %ld MB\n", size >> 20); */
185 * Adjust refresh rate depending on SDRAM type
186 * For types > 128 MBit leave it at the current (fast) rate
188 if (size < 0x02000000) {
189 /* reduce to 15.6 us (62.4 us / quad) */
190 memctl->memc_mptpr = CFG_MPTPR_2BK_4K;
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;
205 memctl->memc_br3 = 0;
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;
217 /* ------------------------------------------------------------------------- */
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
227 static long int dram_size (long int mamr_value, long int *base,
230 volatile immap_t *immap = (immap_t *) CFG_IMMR;
231 volatile memctl8xx_t *memctl = &immap->im_memctl;
233 memctl->memc_mamr = mamr_value;
235 return (get_ram_size(base, maxsize));