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, 22 insertions, 5 deletions

diff --git a/include/asm-avr32/sdram.h b/include/asm-avr32/sdram.h
index 833af6e..7bdefc1 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 */