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Wolfgang Denk7b64fef2006-10-24 14:21:16 +02001/*
2 * Copyright (C) 2006 Atmel Corporation
3 *
4 * See file CREDITS for list of people who contributed to this
5 * project.
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
20 * MA 02111-1307 USA
21 */
22#ifndef __ASM_AVR32_SDRAM_H
23#define __ASM_AVR32_SDRAM_H
24
Haavard Skinnemoena23e2772008-05-19 11:36:28 +020025struct sdram_config {
26 /* Number of data bits. */
27 enum {
28 SDRAM_DATA_16BIT,
29 SDRAM_DATA_32BIT,
30 } data_bits;
31
32 /* Number of address bits */
33 uint8_t row_bits, col_bits, bank_bits;
34
35 /* SDRAM timings in cycles */
36 uint8_t cas, twr, trc, trp, trcd, tras, txsr;
Haavard Skinnemoend38da532008-01-23 17:20:14 +010037
38 /* SDRAM refresh period in cycles */
39 unsigned long refresh_period;
Wolfgang Denk7b64fef2006-10-24 14:21:16 +020040};
41
Haavard Skinnemoena23e2772008-05-19 11:36:28 +020042/*
43 * Attempt to initialize the SDRAM controller using the specified
44 * parameters. Return the expected size of the memory area based on
45 * the number of address and data bits.
46 *
47 * The caller should verify that the configuration is correct by
48 * running a memory test, e.g. get_ram_size().
49 */
50extern unsigned long sdram_init(void *sdram_base,
51 const struct sdram_config *config);
Wolfgang Denk7b64fef2006-10-24 14:21:16 +020052
53#endif /* __ASM_AVR32_SDRAM_H */