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>

1 files changed, 32 insertions, 10 deletions

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 @@ 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)