summaryrefslogtreecommitdiff
path: root/drivers/serial/ns16550.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/serial/ns16550.c')
-rw-r--r--drivers/serial/ns16550.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c
index ed4e6b3..7f013ab 100644
--- a/drivers/serial/ns16550.c
+++ b/drivers/serial/ns16550.c
@@ -36,10 +36,24 @@
void NS16550_init(NS16550_t com_port, int baud_divisor)
{
-#if (!defined(CONFIG_SYS_NS16550_BROKEN_TEMT))
+#if (defined(CONFIG_SPL_BUILD) && defined(CONFIG_OMAP34XX))
+ /*
+ * On some OMAP3 devices when UART3 is configured for boot mode before
+ * SPL starts only THRE bit is set. We have to empty the transmitter
+ * before initialization starts.
+ */
+ if ((serial_in(&com_port->lsr) & (UART_LSR_TEMT | UART_LSR_THRE))
+ == UART_LSR_THRE) {
+ serial_out(UART_LCR_DLAB, &com_port->lcr);
+ serial_out(baud_divisor & 0xff, &com_port->dll);
+ serial_out((baud_divisor >> 8) & 0xff, &com_port->dlm);
+ serial_out(UART_LCRVAL, &com_port->lcr);
+ serial_out(0, &com_port->mdr1);
+ }
+#endif
+
while (!(serial_in(&com_port->lsr) & UART_LSR_TEMT))
;
-#endif
serial_out(CONFIG_SYS_NS16550_IER, &com_port->ier);
#if (defined(CONFIG_OMAP) && !defined(CONFIG_OMAP3_ZOOM2)) || \