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kgdb: kgdboc console poll hooks for serial_txx9 uart

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Implement the serial polling hooks for the serial_txx9 uart for use with
kgdboc.

This patch once got SOB from Jason on Jul 2008 and (perhaps) merged into
kgdb-next branch, but lost somewhere then.  I resend it now with Jason's
Acked-by.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Acked-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Atsushi Nemoto 2009-06-24 18:34:34 +01:00 committed by Linus Torvalds
parent be98eb2c2f
commit a10b32db34
1 changed files with 92 additions and 21 deletions
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113
drivers/serial/serial_txx9.c
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@ -461,6 +461,94 @@ static void serial_txx9_break_ctl(struct uart_port *port, int break_state)
spin_unlock_irqrestore(&up->port.lock, flags); spin_unlock_irqrestore(&up->port.lock, flags);
} }
#if defined(CONFIG_SERIAL_TXX9_CONSOLE) || (CONFIG_CONSOLE_POLL)
/*
* Wait for transmitter & holding register to empty
*/
static void wait_for_xmitr(struct uart_txx9_port *up)
{
unsigned int tmout = 10000;
/* Wait up to 10ms for the character(s) to be sent. */
while (--tmout &&
!(sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS))
udelay(1);
/* Wait up to 1s for flow control if necessary */
if (up->port.flags & UPF_CONS_FLOW) {
tmout = 1000000;
while (--tmout &&
(sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS))
udelay(1);
}
}
#endif
#ifdef CONFIG_CONSOLE_POLL
/*
* Console polling routines for writing and reading from the uart while
* in an interrupt or debug context.
*/
static int serial_txx9_get_poll_char(struct uart_port *port)
{
unsigned int ier;
unsigned char c;
struct uart_txx9_port *up = (struct uart_txx9_port *)port;
/*
* First save the IER then disable the interrupts
*/
ier = sio_in(up, TXX9_SIDICR);
sio_out(up, TXX9_SIDICR, 0);
while (sio_in(up, TXX9_SIDISR) & TXX9_SIDISR_UVALID)
;
c = sio_in(up, TXX9_SIRFIFO);
/*
* Finally, clear RX interrupt status
* and restore the IER
*/
sio_mask(up, TXX9_SIDISR, TXX9_SIDISR_RDIS);
sio_out(up, TXX9_SIDICR, ier);
return c;
}
static void serial_txx9_put_poll_char(struct uart_port *port, unsigned char c)
{
unsigned int ier;
struct uart_txx9_port *up = (struct uart_txx9_port *)port;
/*
* First save the IER then disable the interrupts
*/
ier = sio_in(up, TXX9_SIDICR);
sio_out(up, TXX9_SIDICR, 0);
wait_for_xmitr(up);
/*
* Send the character out.
* If a LF, also do CR...
*/
sio_out(up, TXX9_SITFIFO, c);
if (c == 10) {
wait_for_xmitr(up);
sio_out(up, TXX9_SITFIFO, 13);
}
/*
* Finally, wait for transmitter to become empty
* and restore the IER
*/
wait_for_xmitr(up);
sio_out(up, TXX9_SIDICR, ier);
}
#endif /* CONFIG_CONSOLE_POLL */
static int serial_txx9_startup(struct uart_port *port) static int serial_txx9_startup(struct uart_port *port)
{ {
struct uart_txx9_port *up = (struct uart_txx9_port *)port; struct uart_txx9_port *up = (struct uart_txx9_port *)port;
@ -781,6 +869,10 @@ static struct uart_ops serial_txx9_pops = {
.release_port = serial_txx9_release_port, .release_port = serial_txx9_release_port,
.request_port = serial_txx9_request_port, .request_port = serial_txx9_request_port,
.config_port = serial_txx9_config_port, .config_port = serial_txx9_config_port,
#ifdef CONFIG_CONSOLE_POLL
.poll_get_char = serial_txx9_get_poll_char,
.poll_put_char = serial_txx9_put_poll_char,
#endif
}; };
static struct uart_txx9_port serial_txx9_ports[UART_NR]; static struct uart_txx9_port serial_txx9_ports[UART_NR];
@ -803,27 +895,6 @@ static void __init serial_txx9_register_ports(struct uart_driver *drv,
#ifdef CONFIG_SERIAL_TXX9_CONSOLE #ifdef CONFIG_SERIAL_TXX9_CONSOLE
/*
* Wait for transmitter & holding register to empty
*/
static inline void wait_for_xmitr(struct uart_txx9_port *up)
{
unsigned int tmout = 10000;
/* Wait up to 10ms for the character(s) to be sent. */
while (--tmout &&
!(sio_in(up, TXX9_SICISR) & TXX9_SICISR_TXALS))
udelay(1);
/* Wait up to 1s for flow control if necessary */
if (up->port.flags & UPF_CONS_FLOW) {
tmout = 1000000;
while (--tmout &&
(sio_in(up, TXX9_SICISR) & TXX9_SICISR_CTSS))
udelay(1);
}
}
static void serial_txx9_console_putchar(struct uart_port *port, int ch) static void serial_txx9_console_putchar(struct uart_port *port, int ch)
{ {
struct uart_txx9_port *up = (struct uart_txx9_port *)port; struct uart_txx9_port *up = (struct uart_txx9_port *)port;