AVR32: Resource management rewrite

Rewrite the resource management code (i.e. I/O memory, clock gating,
gpio) so it doesn't depend on any global state. This is necessary
because this code is heavily used before relocation to RAM, so we
can't write to any global variables.

As an added bonus, this makes u-boot's memory footprint a bit smaller,
although some functionality has been left out; all clocks are enabled
all the time, and there's no checking for gpio line conflicts.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/board/atmel/atstk1000/atstk1000.c b/board/atmel/atstk1000/atstk1000.c
index 4d737d293ad..8210bc60e80 100644
--- a/board/atmel/atstk1000/atstk1000.c
+++ b/board/atmel/atstk1000/atstk1000.c
@@ -23,6 +23,8 @@
 
 #include <asm/io.h>
 #include <asm/sdram.h>
+#include <asm/arch/gpio.h>
+#include <asm/arch/hmatrix2.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -40,6 +42,17 @@ static const struct sdram_info sdram = {
 	.txsr		= 5,
 };
 
+int board_early_init_f(void)
+{
+	/* Set the SDRAM_ENABLE bit in the HEBI SFR */
+	hmatrix2_writel(SFR4, 1 << 1);
+
+	gpio_enable_ebi();
+	gpio_enable_usart1();
+
+	return 0;
+}
+
 void board_init_memories(void)
 {
 	gd->sdram_size = sdram_init(&sdram);