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serial: pch_uart: add console poll support 

Implement console poll for pch_uart, this could enable KGDBoC when
on pch-uart console.

Signed-off-by: Liang Li <liang.li@windriver.com>
Acked-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Liang Li 2013-03-05 22:30:38 +08:00 committed by Greg Kroah-Hartman
parent fec6bee367
commit ef44d28c4f
1 changed files with 79 additions and 24 deletions
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103
drivers/tty/serial/pch_uart.c
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@ -1493,29 +1493,6 @@ static int pch_uart_verify_port(struct uart_port *port,
return 0;
}
static struct uart_ops pch_uart_ops = {
.tx_empty = pch_uart_tx_empty,
.set_mctrl = pch_uart_set_mctrl,
.get_mctrl = pch_uart_get_mctrl,
.stop_tx = pch_uart_stop_tx,
.start_tx = pch_uart_start_tx,
.stop_rx = pch_uart_stop_rx,
.enable_ms = pch_uart_enable_ms,
.break_ctl = pch_uart_break_ctl,
.startup = pch_uart_startup,
.shutdown = pch_uart_shutdown,
.set_termios = pch_uart_set_termios,
/* .pm = pch_uart_pm, Not supported yet */
/* .set_wake = pch_uart_set_wake, Not supported yet */
.type = pch_uart_type,
.release_port = pch_uart_release_port,
.request_port = pch_uart_request_port,
.config_port = pch_uart_config_port,
.verify_port = pch_uart_verify_port
};
#ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
/*
* Wait for transmitter & holding register to empty
*/
@ -1547,6 +1524,84 @@ static void wait_for_xmitr(struct eg20t_port *up, int bits)
}
}
#ifdef CONFIG_CONSOLE_POLL
/*
* Console polling routines for communicate via uart while
* in an interrupt or debug context.
*/
static int pch_uart_get_poll_char(struct uart_port *port)
{
struct eg20t_port *priv =
container_of(port, struct eg20t_port, port);
u8 lsr = ioread8(priv->membase + UART_LSR);
if (!(lsr & UART_LSR_DR))
return NO_POLL_CHAR;
return ioread8(priv->membase + PCH_UART_RBR);
}
static void pch_uart_put_poll_char(struct uart_port *port,
unsigned char c)
{
unsigned int ier;
struct eg20t_port *priv =
container_of(port, struct eg20t_port, port);
/*
* First save the IER then disable the interrupts
*/
ier = ioread8(priv->membase + UART_IER);
pch_uart_hal_disable_interrupt(priv, PCH_UART_HAL_ALL_INT);
wait_for_xmitr(priv, UART_LSR_THRE);
/*
* Send the character out.
* If a LF, also do CR...
*/
iowrite8(c, priv->membase + PCH_UART_THR);
if (c == 10) {
wait_for_xmitr(priv, UART_LSR_THRE);
iowrite8(13, priv->membase + PCH_UART_THR);
}
/*
* Finally, wait for transmitter to become empty
* and restore the IER
*/
wait_for_xmitr(priv, BOTH_EMPTY);
iowrite8(ier, priv->membase + UART_IER);
}
#endif /* CONFIG_CONSOLE_POLL */
static struct uart_ops pch_uart_ops = {
.tx_empty = pch_uart_tx_empty,
.set_mctrl = pch_uart_set_mctrl,
.get_mctrl = pch_uart_get_mctrl,
.stop_tx = pch_uart_stop_tx,
.start_tx = pch_uart_start_tx,
.stop_rx = pch_uart_stop_rx,
.enable_ms = pch_uart_enable_ms,
.break_ctl = pch_uart_break_ctl,
.startup = pch_uart_startup,
.shutdown = pch_uart_shutdown,
.set_termios = pch_uart_set_termios,
/* .pm = pch_uart_pm, Not supported yet */
/* .set_wake = pch_uart_set_wake, Not supported yet */
.type = pch_uart_type,
.release_port = pch_uart_release_port,
.request_port = pch_uart_request_port,
.config_port = pch_uart_config_port,
.verify_port = pch_uart_verify_port,
#ifdef CONFIG_CONSOLE_POLL
.poll_get_char = pch_uart_get_poll_char,
.poll_put_char = pch_uart_put_poll_char,
#endif
};
#ifdef CONFIG_SERIAL_PCH_UART_CONSOLE
static void pch_console_putchar(struct uart_port *port, int ch)
{
struct eg20t_port *priv =
@ -1655,7 +1710,7 @@ static struct console pch_console = {
#define PCH_CONSOLE (&pch_console)
#else
#define PCH_CONSOLE NULL
#endif
#endif /* CONFIG_SERIAL_PCH_UART_CONSOLE */
static struct uart_driver pch_uart_driver = {
.owner = THIS_MODULE,