char/cadence_uart: Define Missing SR/ISR fields

Some (interrupt) status register bits relating to the TxFIFO path were
not defined. Define them. This prepares support for proper Tx data path
flow control.
Signed-off-by: NPeter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: 2068b963f0af8cc834c353944e9fa816d950b163.1388626249.git.peter.crosthwaite@xilinx.com
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

hw/char/cadence_uart.c

@@ -34,6 +34,9 @@
 #define UART_SR_INTR_RFUL      0x00000004
 #define UART_SR_INTR_TEMPTY    0x00000008
 #define UART_SR_INTR_TFUL      0x00000010
+/* somewhat awkwardly, TTRIG is misaligned between SR and ISR */
+#define UART_SR_TTRIG          0x00002000
+#define UART_INTR_TTRIG        0x00000400
 /* bits fields in CSR that correlate to CISR. If any of these bits are set in
  * SR, then the same bit in CISR is set high too */
 #define UART_SR_TO_CISR_MASK   0x0000001F
@@ -43,6 +46,7 @@
 #define UART_INTR_PARE         0x00000080
 #define UART_INTR_TIMEOUT      0x00000100
 #define UART_INTR_DMSI         0x00000200
+#define UART_INTR_TOVR         0x00001000
 
 #define UART_SR_RACTIVE    0x00000400
 #define UART_SR_TACTIVE    0x00000800