diff options
| author | Manfred Huber <man.huber@arcor.de> | 2013-03-29 02:52:36 (GMT) |
|---|---|---|
| committer | Tom Rini <trini@ti.com> | 2013-04-08 15:29:05 (GMT) |
| commit | fd2aeac5606f8c706be5e07bead790c6cdee0f23 (patch) | |
| tree | 4607f0485dbd0a8bf0fb4233584886eb9a04e06e /drivers/serial/ns16550.c | |
| parent | 5aa014d613c561fb2e124acd60e4f6a34df17c21 (diff) | |
| download | u-boot-fd2aeac5606f8c706be5e07bead790c6cdee0f23.tar.xz | |
omap3_beagle: Flush UART3 xmit on enable if TEMT is broken
Flush UART3 xmit on enable if TEMT is broken
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. This patch avoids the use of CONFIG_SYS_NS16550_BROKEN_TEMT.
Signed-off-by: Manfred Huber <man.huber@arcor.de>
Tested-by: Javier Martinez Canillas <javier@dowhile0.org>
Tested-by: Andreas Bießmann <andreas.devel@googlemail.com>
Diffstat (limited to 'drivers/serial/ns16550.c')
| -rw-r--r-- | drivers/serial/ns16550.c | 18 |
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)) || \ |