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-rw-r--r--board/atmel/at91cap9adk/at91cap9adk.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/board/atmel/at91cap9adk/at91cap9adk.c b/board/atmel/at91cap9adk/at91cap9adk.c
index e353cea..a3eaf19 100644
--- a/board/atmel/at91cap9adk/at91cap9adk.c
+++ b/board/atmel/at91cap9adk/at91cap9adk.c
@@ -72,6 +72,33 @@ static void at91cap9_serial_hw_init(void)
#endif
}
+static void at91cap9_slowclock_hw_init(void)
+{
+ /*
+ * On AT91CAP9 revC CPUs, the slow clock can be based on an
+ * internal impreciseRC oscillator or an external 32kHz oscillator.
+ * Switch to the latter.
+ */
+#define ARCH_ID_AT91CAP9_REVB 0x399
+#define ARCH_ID_AT91CAP9_REVC 0x601
+ if (at91_sys_read(AT91_PMC_VER) == ARCH_ID_AT91CAP9_REVC) {
+ unsigned i, tmp = at91_sys_read(AT91_SCKCR);
+ if ((tmp & AT91CAP9_SCKCR_OSCSEL) == AT91CAP9_SCKCR_OSCSEL_RC) {
+ extern void timer_init(void);
+ timer_init();
+ tmp |= AT91CAP9_SCKCR_OSC32EN;
+ at91_sys_write(AT91_SCKCR, tmp);
+ for (i = 0; i < 1200; i++)
+ udelay(1000);
+ tmp |= AT91CAP9_SCKCR_OSCSEL_32;
+ at91_sys_write(AT91_SCKCR, tmp);
+ udelay(200);
+ tmp &= ~AT91CAP9_SCKCR_RCEN;
+ at91_sys_write(AT91_SCKCR, tmp);
+ }
+ }
+}
+
static void at91cap9_nor_hw_init(void)
{
unsigned long csa;
@@ -305,6 +332,7 @@ int board_init(void)
gd->bd->bi_boot_params = PHYS_SDRAM + 0x100;
at91cap9_serial_hw_init();
+ at91cap9_slowclock_hw_init();
at91cap9_nor_hw_init();
#ifdef CONFIG_CMD_NAND
at91cap9_nand_hw_init();