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avr32: Rework SDRAM initialization code

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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>
This commit is contained in:
Haavard Skinnemoen
2008-05-19 11:36:28 +02:00
parent 95107b7c02
commit a23e277c4a
10 changed files with 162 additions and 116 deletions
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27
include/asm-avr32/sdram.h
View File

@@ -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 */