tty: serial: altera_uart: Add CONSOLE_POLL support

This allows altera_uart to be used for KGDB debugging over serial line.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 25 insertions, 1 deletions

diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index 1997ad4a39a6..50d279000e79 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -75,12 +75,12 @@ obj-$(CONFIG_SERIAL_OF_PLATFORM) += of_serial.o
 obj-$(CONFIG_SERIAL_OF_PLATFORM_NWPSERIAL) += nwpserial.o
 obj-$(CONFIG_SERIAL_KS8695) += serial_ks8695.o
 obj-$(CONFIG_SERIAL_OMAP) += omap-serial.o
+obj-$(CONFIG_SERIAL_ALTERA_UART) += altera_uart.o
 obj-$(CONFIG_KGDB_SERIAL_CONSOLE) += kgdboc.o
 obj-$(CONFIG_SERIAL_QE) += ucc_uart.o
 obj-$(CONFIG_SERIAL_TIMBERDALE) += timbuart.o
 obj-$(CONFIG_SERIAL_GRLIB_GAISLER_APBUART) += apbuart.o
 obj-$(CONFIG_SERIAL_ALTERA_JTAGUART) += altera_jtaguart.o
-obj-$(CONFIG_SERIAL_ALTERA_UART) += altera_uart.o
 obj-$(CONFIG_SERIAL_VT8500) += vt8500_serial.o
 obj-$(CONFIG_SERIAL_MRST_MAX3110)       += mrst_max3110.o
 obj-$(CONFIG_SERIAL_MFD_HSU)    += mfd.o
diff --git a/drivers/tty/serial/altera_uart.c b/drivers/tty/serial/altera_uart.c
index 217833e94b5b..e7903751e058 100644
--- a/drivers/tty/serial/altera_uart.c
+++ b/drivers/tty/serial/altera_uart.c
@@ -377,6 +377,26 @@ static int altera_uart_verify_port(struct uart_port *port,
         return 0;
 }
 
+#ifdef CONFIG_CONSOLE_POLL
+static int altera_uart_poll_get_char(struct uart_port *port)
+{
+        while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
+                 ALTERA_UART_STATUS_RRDY_MSK))
+                cpu_relax();
+
+        return altera_uart_readl(port, ALTERA_UART_RXDATA_REG);
+}
+
+static void altera_uart_poll_put_char(struct uart_port *port, unsigned char c)
+{
+        while (!(altera_uart_readl(port, ALTERA_UART_STATUS_REG) &
+                 ALTERA_UART_STATUS_TRDY_MSK))
+                cpu_relax();
+
+        altera_uart_writel(port, c, ALTERA_UART_TXDATA_REG);
+}
+#endif
+
 /*
  *      Define the basic serial functions we support.
  */
@@ -397,6 +417,10 @@ static struct uart_ops altera_uart_ops = {
         .release_port   = altera_uart_release_port,
         .config_port    = altera_uart_config_port,
         .verify_port    = altera_uart_verify_port,
+#ifdef CONFIG_CONSOLE_POLL
+        .poll_get_char  = altera_uart_poll_get_char,
+        .poll_put_char  = altera_uart_poll_put_char,
+#endif
 };
 
 static struct altera_uart altera_uart_ports[CONFIG_SERIAL_ALTERA_UART_MAXPORTS];