[PATCH] serial: Add CONSOLE_POLL support for uartlite

[Michal Simek]

CONSOLE_POLL support for uartlite enables
KGDB debugging over serial line.

Signed-off-by: Michal Simek <mon...@monstr.eu>
---
drivers/serial/uartlite.c | 26 +++++++++++++++++++++++++-
1 files changed, 25 insertions(+), 1 deletions(-)

diff --git a/drivers/serial/uartlite.c b/drivers/serial/uartlite.c
index caf085d..ce1f3e0 100644
--- a/drivers/serial/uartlite.c
+++ b/drivers/serial/uartlite.c
@@ -322,6 +322,26 @@ static int ulite_verify_port(struct uart_port *port, struct serial_struct *ser)
return -EINVAL;
}

+#ifdef CONFIG_CONSOLE_POLL
+static int ulite_get_poll_char(struct uart_port *port)
+{
+ while (!(ioread32be(port->membase + ULITE_STATUS)
+ & ULITE_STATUS_RXVALID))
+ cpu_relax();
+
+ return ioread32be(port->membase + ULITE_RX);
+}
+
+static void ulite_put_poll_char(struct uart_port *port, unsigned char ch)
+{
+ while (ioread32be(port->membase + ULITE_STATUS) & ULITE_STATUS_TXFULL)
+ cpu_relax();
+
+ /* write char to device */
+ iowrite32be(ch, port->membase + ULITE_TX);
+}
+#endif
+
static struct uart_ops ulite_ops = {
.tx_empty = ulite_tx_empty,
.set_mctrl = ulite_set_mctrl,
@@ -338,7 +358,11 @@ static struct uart_ops ulite_ops = {
.release_port = ulite_release_port,
.request_port = ulite_request_port,
.config_port = ulite_config_port,
- .verify_port = ulite_verify_port
+ .verify_port = ulite_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+ .poll_get_char = ulite_get_poll_char,
+ .poll_put_char = ulite_put_poll_char,
+#endif
};

/* ---------------------------------------------------------------------
--
1.5.5.6

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majo...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

[Jason Wessel]

On 08/09/2010 05:07 AM, Michal Simek wrote:
> CONSOLE_POLL support for uartlite enables
> KGDB debugging over serial line.
>
> Signed-off-by: Michal Simek <mon...@monstr.eu>
> ---
> drivers/serial/uartlite.c | 26 +++++++++++++++++++++++++-
> 1 files changed, 25 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/serial/uartlite.c b/drivers/serial/uartlite.c
> index caf085d..ce1f3e0 100644
> --- a/drivers/serial/uartlite.c
> +++ b/drivers/serial/uartlite.c
> @@ -322,6 +322,26 @@ static int ulite_verify_port(struct uart_port *port, struct serial_struct *ser)
> return -EINVAL;
> }
>
> +#ifdef CONFIG_CONSOLE_POLL
> +static int ulite_get_poll_char(struct uart_port *port)
> +{
> + while (!(ioread32be(port->membase + ULITE_STATUS)
> + & ULITE_STATUS_RXVALID))
> + cpu_relax();
> +
> + return ioread32be(port->membase + ULITE_RX);
> +}

After kdb was merged, the CONSOLE_POLL API had a subtle change where
all I/O drivers should return immediately with a return of
NO_POLL_CHAR in order to allow more than one I/O driver to operate in
the same poll loop.

The patch should look like the following for the get_poll_char.

+static int ulite_get_poll_char(struct uart_port *port)
+{

+ if (!(ioread32be(port->membase + ULITE_STATUS)
+ & ULITE_STATUS_RXVALID))
+ return NO_POLL_CHAR;

+
+ return ioread32be(port->membase + ULITE_RX);
+}

If you agree to the change you can add my SOB.

Signed-off-by: Jason Wessel <jason....@windriver.com>

Cheers,
Jason.

[Michal Simek]

I have no problem with it.

Thanks,
Michal

--
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/
Microblaze U-BOOT custodian