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authorHaavard Skinnemoen <hskinnemoen@atmel.com>2008-01-23 17:20:14 +0100
committerHaavard Skinnemoen <hskinnemoen@atmel.com>2008-02-05 12:14:27 +0100
commitd38da537943cd36356b9d3d9d9b60533554b81d8 (patch)
tree6263c715346047e4cda757dff839f4e1052652b7 /board/atmel
parent61151cccb660cdb06a07fb283de6089913d7bde0 (diff)
AVR32: Make SDRAM refresh rate configurable
The existing code assumes the SDRAM row refresh period should always be 15.6 us. This is not always true, and indeed on the ATNGW100, the refresh rate should really be 7.81 us. Add a refresh_period member to struct sdram_info and initialize it properly for both ATSTK1000 and ATNGW100. Out-of-tree boards will panic() until the refresh_period member is updated properly. Big thanks to Gerhard Berghofer for pointing out this issue. Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Diffstat (limited to 'board/atmel')
-rw-r--r--board/atmel/atngw100/atngw100.c3
-rw-r--r--board/atmel/atstk1000/atstk1000.c3
2 files changed, 6 insertions, 0 deletions
diff --git a/board/atmel/atngw100/atngw100.c b/board/atmel/atngw100/atngw100.c
index bd4b6b4ce5b..1ccbe2c1817 100644
--- a/board/atmel/atngw100/atngw100.c
+++ b/board/atmel/atngw100/atngw100.c
@@ -23,6 +23,7 @@
#include <asm/io.h>
#include <asm/sdram.h>
+#include <asm/arch/clk.h>
#include <asm/arch/gpio.h>
#include <asm/arch/hmatrix2.h>
@@ -40,6 +41,8 @@ static const struct sdram_info sdram = {
.trcd = 2,
.tras = 5,
.txsr = 5,
+ /* 7.81 us */
+ .refresh_period = (781 * (SDRAMC_BUS_HZ / 1000)) / 100000,
};
int board_early_init_f(void)
diff --git a/board/atmel/atstk1000/atstk1000.c b/board/atmel/atstk1000/atstk1000.c
index 6618963cc0e..28f64c4a6f2 100644
--- a/board/atmel/atstk1000/atstk1000.c
+++ b/board/atmel/atstk1000/atstk1000.c
@@ -23,6 +23,7 @@
#include <asm/io.h>
#include <asm/sdram.h>
+#include <asm/arch/clk.h>
#include <asm/arch/gpio.h>
#include <asm/arch/hmatrix2.h>
@@ -40,6 +41,8 @@ static const struct sdram_info sdram = {
.trcd = 2,
.tras = 5,
.txsr = 5,
+ /* 15.6 us */
+ .refresh_period = (156 * (SDRAMC_BUS_HZ / 1000)) / 10000,
};
int board_early_init_f(void)