From a23e277c4a3a2bbc42d237aae29da3a8971e757f Mon Sep 17 00:00:00 2001 From: Haavard Skinnemoen Date: Mon, 19 May 2008 11:36:28 +0200 Subject: avr32: Rework SDRAM initialization code 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 --- include/asm-avr32/sdram.h | 27 ++++++++++++++++++++++----- 1 file changed, 22 insertions(+), 5 deletions(-) (limited to 'include/asm-avr32/sdram.h') diff --git a/include/asm-avr32/sdram.h b/include/asm-avr32/sdram.h index 833af6e6ad..7bdefc1fd2 100644 --- a/include/asm-avr32/sdram.h +++ b/include/asm-avr32/sdram.h @@ -22,15 +22,32 @@ #ifndef __ASM_AVR32_SDRAM_H #define __ASM_AVR32_SDRAM_H -struct sdram_info { - unsigned long phys_addr; - unsigned int row_bits, col_bits, bank_bits; - unsigned int cas, twr, trc, trp, trcd, tras, txsr; +struct sdram_config { + /* Number of data bits. */ + enum { + SDRAM_DATA_16BIT, + SDRAM_DATA_32BIT, + } data_bits; + + /* Number of address bits */ + uint8_t row_bits, col_bits, bank_bits; + + /* SDRAM timings in cycles */ + uint8_t cas, twr, trc, trp, trcd, tras, txsr; /* SDRAM refresh period in cycles */ unsigned long refresh_period; }; -extern unsigned long sdram_init(const struct sdram_info *info); +/* + * Attempt to initialize the SDRAM controller using the specified + * parameters. Return the expected size of the memory area based on + * the number of address and data bits. + * + * The caller should verify that the configuration is correct by + * running a memory test, e.g. get_ram_size(). + */ +extern unsigned long sdram_init(void *sdram_base, + const struct sdram_config *config); #endif /* __ASM_AVR32_SDRAM_H */ -- cgit