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 <haavard.skinnemoen@atmel.com>
diff --git a/board/atmel/atstk1000/atstk1000.c b/board/atmel/atstk1000/atstk1000.c
index 52fec65..33bdba6 100644
--- a/board/atmel/atstk1000/atstk1000.c
+++ b/board/atmel/atstk1000/atstk1000.c
@@ -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 @@
.txsr = 7,
/* 7.81 us */
.refresh_period = (781 * (SDRAMC_BUS_HZ / 1000)) / 100000,
-};
+#else
+ /* 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
-/* MT48LC2M32B2-5 on motherboard */
-static const struct sdram_info sdram = {
- .phys_addr = CFG_SDRAM_BASE,
.row_bits = 11,
+#endif
.col_bits = 8,
.bank_bits = 2,
.cas = 3,
@@ -62,8 +69,8 @@
.txsr = 5,
/* 15.6 us */
.refresh_period = (156 * (SDRAMC_BUS_HZ / 1000)) / 10000,
-};
#endif
+};
int board_early_init_f(void)
{
@@ -85,7 +92,22 @@
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)