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authorHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2008-05-19 11:36:28 +0200
committerHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2008-05-27 15:27:31 +0200
commita23e277c4a3a2bbc42d237aae29da3a8971e757f (patch)
tree22e2e0bc2559d38166e1d1844c9a8ac0429b0475 /include/asm-avr32/sdram.h
parent95107b7c028806919630bf02c653aa8f4f867c94 (diff)
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>
Diffstat (limited to 'include/asm-avr32/sdram.h')
-rw-r--r--include/asm-avr32/sdram.h27
1 files changed, 22 insertions, 5 deletions
diff --git a/include/asm-avr32/sdram.h b/include/asm-avr32/sdram.h
index 833af6e6ad..7bdefc1fd2 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 */