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serial: sh-sci: console drainage

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Modify the serial console code to wait for the transmit FIFO,
make sure all bits have been put on the wire before returning.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2009-02-24 15:57:12 +09:00 committed by Paul Mundt
parent a73090ffaf
commit 973e5d525d
1 changed files with 7 additions and 1 deletions
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8
drivers/serial/sh-sci.c
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@ -139,7 +139,7 @@ static void sci_poll_put_char(struct uart_port *port, unsigned char c)
} while (!(status & SCxSR_TDxE(port)));
sci_in(port, SCxSR); /* Dummy read */
sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port) & ~SCxSR_TEND(port));
sci_out(port, SCxTDR, c);
}
#endif /* CONFIG_CONSOLE_POLL || CONFIG_SERIAL_SH_SCI_CONSOLE */
@ -1095,6 +1095,7 @@ static void serial_console_write(struct console *co, const char *s,
unsigned count)
{
struct uart_port *port = &serial_console_port->port;
unsigned short bits;
int i;
for (i = 0; i < count; i++) {
@ -1103,6 +1104,11 @@ static void serial_console_write(struct console *co, const char *s,
sci_poll_put_char(port, *s++);
}
/* wait until fifo is empty and last bit has been transmitted */
bits = SCxSR_TDxE(port) | SCxSR_TEND(port);
while ((sci_in(port, SCxSR) & bits) != bits)
cpu_relax();
}
static int __init serial_console_setup(struct console *co, char *options)