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serial: atmel_serial: add poll_get_char and poll_put_char uart_ops

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Permits using KGDB over the console with the atmel_serial driver.

[akpm@linux-foundation.org: s/barrier/cpu_relax/]
Signed-off-by: Albin Tonnerre <albin.tonnerre@free-electrons.com>
Acked-by: Andrew Victor <linux@maxim.org.za>
Acked-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Albin Tonnerre 2009-12-09 12:31:32 -08:00 committed by Greg Kroah-Hartman
parent 8b505ca8e2
commit 8fe2d54145
1 changed files with 22 additions and 0 deletions
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22
drivers/serial/atmel_serial.c
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@ -1213,6 +1213,24 @@ static int atmel_verify_port(struct uart_port *port, struct serial_struct *ser)
return ret;
}
#ifdef CONFIG_CONSOLE_POLL
static int atmel_poll_get_char(struct uart_port *port)
{
while (!(UART_GET_CSR(port) & ATMEL_US_RXRDY))
cpu_relax();
return UART_GET_CHAR(port);
}
static void atmel_poll_put_char(struct uart_port *port, unsigned char ch)
{
while (!(UART_GET_CSR(port) & ATMEL_US_TXRDY))
cpu_relax();
UART_PUT_CHAR(port, ch);
}
#endif
static struct uart_ops atmel_pops = {
.tx_empty = atmel_tx_empty,
.set_mctrl = atmel_set_mctrl,
@ -1232,6 +1250,10 @@ static struct uart_ops atmel_pops = {
.config_port = atmel_config_port,
.verify_port = atmel_verify_port,
.pm = atmel_serial_pm,
#ifdef CONFIG_CONSOLE_POLL
.poll_get_char = atmel_poll_get_char,
.poll_put_char = atmel_poll_put_char,
#endif
};
/*