kgdb: kgdboc console poll hooks for serial_txx9 uart

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>

diff --git a/drivers/serial/serial_txx9.c b/drivers/serial/serial_txx9.c
index 7313c2edcb831b873d89156bb6200179dd642fb8..54dd16d66a4bc7e2a1152c87828c7eab0b14ba3b 100644 (file)
--- a/drivers/serial/serial_txx9.c
+++ b/drivers/serial/serial_txx9.c
@@ -461,6 +461,94 @@ static void serial_txx9_break_ctl(struct uart_port *port, int break_state)
        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)
 {
        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,
        .request_port   = serial_txx9_request_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];
@@ -803,27 +895,6 @@ static void __init serial_txx9_register_ports(struct uart_driver *drv,
 
 #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)
 {
        struct uart_txx9_port *up = (struct uart_txx9_port *)port;