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tty: serial: KGDB support for PXA 

Actually, in order to support KGDB over serial console one must
implement two callbacks for character polling. Clone them from
8250 driver with a bit of tuning.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: Marko Katic <dromede@gmail.com>
CC: Eric Miao <eric.y.miao@gmail.com>
CC: Russell King <linux@arm.linux.org.uk>
Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com>

 drivers/tty/serial/pxa.c |   55 ++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 55 insertions(+), 0 deletions(-)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Denis V. Lunev 2012-10-21 12:00:30 +08:00 committed by Greg Kroah-Hartman
parent c97399418a
commit e1a9c17969
1 changed files with 55 additions and 0 deletions
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55
drivers/tty/serial/pxa.c
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@ -705,6 +705,57 @@ serial_pxa_console_write(struct console *co, const char *s, unsigned int count)
clk_disable_unprepare(up->clk); clk_disable_unprepare(up->clk);
} }
#ifdef CONFIG_CONSOLE_POLL
/*
* Console polling routines for writing and reading from the uart while
* in an interrupt or debug context.
*/
static int serial_pxa_get_poll_char(struct uart_port *port)
{
struct uart_pxa_port *up = (struct uart_pxa_port *)port;
unsigned char lsr = serial_in(up, UART_LSR);
while (!(lsr & UART_LSR_DR))
lsr = serial_in(up, UART_LSR);
return serial_in(up, UART_RX);
}
static void serial_pxa_put_poll_char(struct uart_port *port,
unsigned char c)
{
unsigned int ier;
struct uart_pxa_port *up = (struct uart_pxa_port *)port;
/*
* First save the IER then disable the interrupts
*/
ier = serial_in(up, UART_IER);
serial_out(up, UART_IER, UART_IER_UUE);
wait_for_xmitr(up);
/*
* Send the character out.
* If a LF, also do CR...
*/
serial_out(up, UART_TX, c);
if (c == 10) {
wait_for_xmitr(up);
serial_out(up, UART_TX, 13);
}
/*
* Finally, wait for transmitter to become empty
* and restore the IER
*/
wait_for_xmitr(up);
serial_out(up, UART_IER, ier);
}
#endif /* CONFIG_CONSOLE_POLL */
static int __init static int __init
serial_pxa_console_setup(struct console *co, char *options) serial_pxa_console_setup(struct console *co, char *options)
{ {
@ -759,6 +810,10 @@ struct uart_ops serial_pxa_pops = {
.request_port = serial_pxa_request_port, .request_port = serial_pxa_request_port,
.config_port = serial_pxa_config_port, .config_port = serial_pxa_config_port,
.verify_port = serial_pxa_verify_port, .verify_port = serial_pxa_verify_port,
#ifdef CONFIG_CONSOLE_POLL
.poll_get_char = serial_pxa_get_poll_char,
.poll_put_char = serial_pxa_put_poll_char,
#endif
}; };
static struct uart_driver serial_pxa_reg = { static struct uart_driver serial_pxa_reg = {