[PATCH] or1ksim: Console: implement uart_read_polled

[Hesham ALMatary]

Implement uart_read_polled which is needed for any application that
reads input from users. It works fine with pppd, capture, and all
termios tests.
---
 c/src/lib/libbsp/or1k/or1ksim/console/uart.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/c/src/lib/libbsp/or1k/or1ksim/console/uart.c b/c/src/lib/libbsp/or1k/or1ksim/console/uart.c
index f1cfa09..c0ee618 100644
--- a/c/src/lib/libbsp/or1k/or1ksim/console/uart.c
+++ b/c/src/lib/libbsp/or1k/or1ksim/console/uart.c
@@ -86,9 +86,18 @@ static int uart_last_close(int major, int minor, void *arg)
   return 0;
 }
 
-static int uart_read_polled(int minor)
+static char uart_read_polled(int minor)
 {
-   return -1;
+  unsigned char lsr;
+  char c;
+
+ /* Get a character when avaiable */
+  do {
+       lsr = OR1KSIM_REG(OR1KSIM_BSP_UART_REG_LINE_STATUS);
+  } while ((lsr & OR1KSIM_BSP_UART_REG_LINE_STATUS_DR) 
+           != OR1KSIM_BSP_UART_REG_LINE_STATUS_DR);
+
+  return OR1KSIM_REG(OR1KSIM_BSP_UART_REG_RX);
 }
 
 static void uart_write_polled(int minor, char c)
-- 
1.9.3