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omap3_beagle: Flush UART3 xmit on enable if TEMT is broken

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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>
This commit is contained in:
Manfred Huber
2013-03-29 02:52:36 +00:00
committed by Tom Rini
parent 5aa014d613
commit fd2aeac560
3 changed files with 16 additions and 13 deletions
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18
drivers/serial/ns16550.c
View File

@@ -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)) || \