summaryrefslogtreecommitdiffstats
path: root/board/lantec/lantec.c
blob: 6d3486c48a0a23380dacaa0637487c14579e8baa (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
/*
 * (C) Copyright 2000, 2001
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 * (C) Copyright 2001
 * Torsten Stevens, FHG IMS, stevens@ims.fhg.de
 * Bruno Achauer, Exet AG, bruno@exet-ag.de.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/*
 * Derived from ../tqm8xx/tqm8xx.c
 */

#include <common.h>
#include <mpc8xx.h>

/* ------------------------------------------------------------------------- */

static long int dram_size (long int, long int *, long int);

/* ------------------------------------------------------------------------- */

#define	_NOT_USED_	0xFFFFFFFF

const uint sdram_table[] = {
	/*
	 * Single Read. (Offset 0 in UPMA RAM)
	 */
	0x1f07fc04, 0xeeaefc04, 0x11adfc04, 0xefbbbc00,
	0x1ff77c47,		/* last */
	/*
	 * SDRAM Initialization (offset 5 in UPMA RAM)
	 *
	 * This is no UPM entry point. The following definition uses
	 * the remaining space to establish an initialization
	 * sequence, which is executed by a RUN command.
	 *
	 */
	0x1ff77c35, 0xefeabc34, 0x1fb57c35,	/* last */
	/*
	 * Burst Read. (Offset 8 in UPMA RAM)
	 */
	0x1f07fc04, 0xeeaefc04, 0x10adfc04, 0xf0affc00,
	0xf0affc00, 0xf1affc00, 0xefbbbc00, 0x1ff77c47,	/* last */
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Single Write. (Offset 18 in UPMA RAM)
	 */
	0x1f27fc04, 0xeeaebc00, 0x01b93c04, 0x1ff77c47,	/* last */
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Burst Write. (Offset 20 in UPMA RAM)
	 */
	0x1f07fc04, 0xeeaebc00, 0x10ad7c00, 0xf0affc00,
	0xf0affc00, 0xe1bbbc04, 0x1ff77c47,	/* last */
	_NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Refresh  (Offset 30 in UPMA RAM)
	 */
	0x1ff5fc84, 0xfffffc04, 0xfffffc04, 0xfffffc04,
	0xfffffc84, 0xfffffc07, 0xfffffc07,	/* last */
	_NOT_USED_,
	_NOT_USED_, _NOT_USED_, _NOT_USED_, _NOT_USED_,
	/*
	 * Exception. (Offset 3c in UPMA RAM)
	 */
	0x7ffffc07,		/* last */
	_NOT_USED_, _NOT_USED_, _NOT_USED_,
};

/* ------------------------------------------------------------------------- */


/*
 * Check Board Identity:
 *
 * Test TQ ID string (TQM8xx...)
 * If present, check for "L" type (no second DRAM bank),
 * otherwise "L" type is assumed as default.
 *
 * Return 1 for "L" type, 0 else.
 */

int checkboard (void)
{
	printf ("Board: Lantec special edition rev.%d\n", CONFIG_LANTEC);
	return 0;
}

/* ------------------------------------------------------------------------- */

phys_size_t initdram (int board_type)
{
	volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;
	long int size_b0;
	int i;

	/*
	 * Configure UPMA for SDRAM
	 */
	upmconfig (UPMA, (uint *) sdram_table,
		   sizeof (sdram_table) / sizeof (uint));

	memctl->memc_mptpr = CONFIG_SYS_MPTPR_1BK_8K /* XXX CONFIG_SYS_MPTPR XXX */ ;

	/* burst length=4, burst type=sequential, CAS latency=2 */
	memctl->memc_mar = 0x00000088;

	/*
	 * Map controller bank 3 to the SDRAM bank at preliminary address.
	 */
	memctl->memc_or3 = CONFIG_SYS_OR3_PRELIM;
	memctl->memc_br3 = CONFIG_SYS_BR3_PRELIM;

	/* initialize memory address register */
	memctl->memc_mamr = CONFIG_SYS_MAMR_8COL;	/* refresh not enabled yet */

	/* mode initialization (offset 5) */
	udelay (200);		/* 0x80006105 */
	memctl->memc_mcr =
		MCR_OP_RUN | MCR_MB_CS3 | MCR_MLCF (1) | MCR_MAD (0x05);

	/* run 2 refresh sequence with 4-beat refresh burst (offset 0x30) */
	udelay (1);		/* 0x80006130 */
	memctl->memc_mcr =
		MCR_OP_RUN | MCR_MB_CS3 | MCR_MLCF (1) | MCR_MAD (0x30);
	udelay (1);		/* 0x80006130 */
	memctl->memc_mcr =
		MCR_OP_RUN | MCR_MB_CS3 | MCR_MLCF (1) | MCR_MAD (0x30);

	udelay (1);		/* 0x80006106 */
	memctl->memc_mcr =
		MCR_OP_RUN | MCR_MB_CS3 | MCR_MLCF (1) | MCR_MAD (0x06);

	memctl->memc_mamr |= MAMR_PTAE;	/* refresh enabled */

	udelay (200);

	/* Need at least 10 DRAM accesses to stabilize */
	for (i = 0; i < 10; ++i) {
		volatile unsigned long *addr =
			(volatile unsigned long *) SDRAM_BASE3_PRELIM;
		unsigned long val;

		val = *(addr + i);
		*(addr + i) = val;
	}

	/*
	 * Check Bank 0 Memory Size for re-configuration
	 */
	size_b0 = dram_size (CONFIG_SYS_MAMR_8COL,
			     (long *) SDRAM_BASE3_PRELIM, SDRAM_MAX_SIZE);

	memctl->memc_mamr = CONFIG_SYS_MAMR_8COL | MAMR_PTAE;

	/*
	 * Final mapping:
	 */

	memctl->memc_or3 = ((-size_b0) & 0xFFFF0000) | CONFIG_SYS_OR_TIMING_SDRAM;
	memctl->memc_br3 = (CONFIG_SYS_SDRAM_BASE & BR_BA_MSK) | BR_MS_UPMA | BR_V;
	udelay (1000);

	return (size_b0);
}

/* ------------------------------------------------------------------------- */

/*
 * Check memory range for valid RAM. A simple memory test determines
 * the actually available RAM size between addresses `base' and
 * `base + maxsize'. Some (not all) hardware errors are detected:
 * - short between address lines
 * - short between data lines
 */

static long int dram_size (long int mamr_value, long int *base,
			   long int maxsize)
{
	volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
	volatile memctl8xx_t *memctl = &immap->im_memctl;

	memctl->memc_mamr = mamr_value;

	return (get_ram_size (base, maxsize));
}