mirror of
https://github.com/brain-hackers/u-boot-brain
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a23e277c4a
This cleans up the SDRAM initialization and related code a bit, and
allows faster booting.
* Add definitions for EBI and internal SRAM to asm/arch/memory-map.h
* Remove memory test from sdram_init() and make caller responsible
for verifying the SDRAM and determining its size.
* Remove base_address member from struct sdram_config (was sdram_info)
* Add data_bits member to struct sdram_config and kill CFG_SDRAM_16BIT
* Add support for a common STK1000 hack: 16MB SDRAM instead of 8.
Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
54 lines
1.6 KiB
C
54 lines
1.6 KiB
C
/*
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* Copyright (C) 2006 Atmel Corporation
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef __ASM_AVR32_SDRAM_H
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#define __ASM_AVR32_SDRAM_H
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struct sdram_config {
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/* Number of data bits. */
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enum {
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SDRAM_DATA_16BIT,
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SDRAM_DATA_32BIT,
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} data_bits;
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/* Number of address bits */
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uint8_t row_bits, col_bits, bank_bits;
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/* SDRAM timings in cycles */
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uint8_t cas, twr, trc, trp, trcd, tras, txsr;
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/* SDRAM refresh period in cycles */
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unsigned long refresh_period;
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};
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/*
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* Attempt to initialize the SDRAM controller using the specified
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* parameters. Return the expected size of the memory area based on
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* the number of address and data bits.
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*
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* The caller should verify that the configuration is correct by
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* running a memory test, e.g. get_ram_size().
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*/
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extern unsigned long sdram_init(void *sdram_base,
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const struct sdram_config *config);
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#endif /* __ASM_AVR32_SDRAM_H */
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