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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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21
board/atmel/atngw100/atngw100.c
View File

@@ -29,8 +29,8 @@
DECLARE_GLOBAL_DATA_PTR;
static const struct sdram_info sdram = {
.phys_addr = CFG_SDRAM_BASE,
static const struct sdram_config sdram_config = {
.data_bits = SDRAM_DATA_16BIT,
.row_bits = 13,
.col_bits = 9,
.bank_bits = 2,
@@ -66,7 +66,22 @@ int board_early_init_f(void)
long int initdram(int board_type)
{
return sdram_init(&sdram);
unsigned long expected_size;
unsigned long actual_size;
void *sdram_base;
sdram_base = map_physmem(EBI_SDRAM_BASE, EBI_SDRAM_SIZE, MAP_NOCACHE);
expected_size = sdram_init(sdram_base, &sdram_config);
actual_size = get_ram_size(sdram_base, expected_size);
unmap_physmem(sdram_base, EBI_SDRAM_SIZE);
if (expected_size != actual_size)
printf("Warning: Only %u of %u MiB SDRAM is working\n",
actual_size >> 20, expected_size >> 20);
return actual_size;
}
void board_init_info(void)

42
board/atmel/atstk1000/atstk1000.c
View File

@@ -29,10 +29,10 @@
DECLARE_GLOBAL_DATA_PTR;
#ifdef CONFIG_ATSTK1006
/* Dual MT48LC16M16A2-7E on daughterboard */
static const struct sdram_info sdram = {
.phys_addr = CFG_SDRAM_BASE,
static const struct sdram_config sdram_config = {
#if defined(CONFIG_ATSTK1006)
/* Dual MT48LC16M16A2-7E (64 MB) on daughterboard */
.data_bits = SDRAM_DATA_32BIT,
.row_bits = 13,
.col_bits = 9,
.bank_bits = 2,
@@ -45,12 +45,19 @@ static const struct sdram_info sdram = {
.txsr = 7,
/* 7.81 us */
.refresh_period = (781 * (SDRAMC_BUS_HZ / 1000)) / 100000,
};
#else
/* MT48LC2M32B2-5 on motherboard */
static const struct sdram_info sdram = {
.phys_addr = CFG_SDRAM_BASE,
/* MT48LC2M32B2P-5 (8 MB) on motherboard */
#ifdef CONFIG_ATSTK1004
.data_bits = SDRAM_DATA_16BIT,
#else
.data_bits = SDRAM_DATA_32BIT,
#endif
#ifdef CONFIG_ATSTK1000_16MB_SDRAM
/* MT48LC4M32B2P-6 (16 MB) on mod'ed motherboard */
.row_bits = 12,
#else
.row_bits = 11,
#endif
.col_bits = 8,
.bank_bits = 2,
.cas = 3,
@@ -62,8 +69,8 @@ static const struct sdram_info sdram = {
.txsr = 5,
/* 15.6 us */
.refresh_period = (156 * (SDRAMC_BUS_HZ / 1000)) / 10000,
};
#endif
};
int board_early_init_f(void)
{
@@ -85,7 +92,22 @@ int board_early_init_f(void)
long int initdram(int board_type)
{
return sdram_init(&sdram);
unsigned long expected_size;
unsigned long actual_size;
void *sdram_base;
sdram_base = map_physmem(EBI_SDRAM_BASE, EBI_SDRAM_SIZE, MAP_NOCACHE);
expected_size = sdram_init(sdram_base, &sdram_config);
actual_size = get_ram_size(sdram_base, expected_size);
unmap_physmem(sdram_base, EBI_SDRAM_SIZE);
if (expected_size != actual_size)
printf("Warning: Only %u of %u MiB SDRAM is working\n",
actual_size >> 20, expected_size >> 20);
return actual_size;
}
void board_init_info(void)