-#define UART_LCR_DLAB 0x80 /* Divisor latch access bit */
-#define UART_LCR_SBC 0x40 /* Set break control */
-#define UART_LCR_SPAR 0x20 /* Stick parity (?) */
-#define UART_LCR_EPAR 0x10 /* Even parity select */
-#define UART_LCR_PARITY 0x08 /* Parity Enable */
-#define UART_LCR_STOP 0x04 /* Stop bits: 0=1 stop bit, 1= 2 stop bits */
-#define UART_LCR_WLEN5 0x00 /* Wordlength: 5 bits */
-#define UART_LCR_WLEN6 0x01 /* Wordlength: 6 bits */
-#define UART_LCR_WLEN7 0x02 /* Wordlength: 7 bits */
-#define UART_LCR_WLEN8 0x03 /* Wordlength: 8 bits */
+#define UART_LCR_DLAB 0x80 /* Divisor latch access bit */
+#define UART_LCR_SBC 0x40 /* Set break control */
+#define UART_LCR_SPAR 0x20 /* Stick parity (?) */
+#define UART_LCR_EPAR 0x10 /* Even parity select */
+#define UART_LCR_PARITY 0x08 /* Parity Enable */
+#define UART_LCR_STOP 0x04 /* Stop bits: 0=1 bit, 1=2 bits */
+#define UART_LCR_WLEN5 0x00 /* Wordlength: 5 bits */
+#define UART_LCR_WLEN6 0x01 /* Wordlength: 6 bits */
+#define UART_LCR_WLEN7 0x02 /* Wordlength: 7 bits */
+#define UART_LCR_WLEN8 0x03 /* Wordlength: 8 bits */
+
+#define UART_MCR 4 /* Out: Modem Control Register */
+#define UART_MCR_CLKSEL 0x80 /* Divide clock by 4 (TI16C752, EFR[4]=1) */
+#define UART_MCR_TCRTLR 0x40 /* Access TCR/TLR (TI16C752, EFR[4]=1) */
+#define UART_MCR_XONANY 0x20 /* Enable Xon Any (TI16C752, EFR[4]=1) */
+#define UART_MCR_AFE 0x20 /* Enable auto-RTS/CTS (TI16C550C/TI16C750) */
+#define UART_MCR_LOOP 0x10 /* Enable loopback test mode */
+#define UART_MCR_OUT2 0x08 /* Out2 complement */
+#define UART_MCR_OUT1 0x04 /* Out1 complement */
+#define UART_MCR_RTS 0x02 /* RTS complement */
+#define UART_MCR_DTR 0x01 /* DTR complement */
+
+#define UART_LSR 5 /* In: Line Status Register */
+#define UART_LSR_TEMT 0x40 /* Transmitter empty */
+#define UART_LSR_THRE 0x20 /* Transmit-hold-register empty */
+#define UART_LSR_BI 0x10 /* Break interrupt indicator */
+#define UART_LSR_FE 0x08 /* Frame error indicator */
+#define UART_LSR_PE 0x04 /* Parity error indicator */
+#define UART_LSR_OE 0x02 /* Overrun error indicator */
+#define UART_LSR_DR 0x01 /* Receiver data ready */
+
+#define UART_MSR 6 /* In: Modem Status Register */
+#define UART_MSR_DCD 0x80 /* Data Carrier Detect */
+#define UART_MSR_RI 0x40 /* Ring Indicator */
+#define UART_MSR_DSR 0x20 /* Data Set Ready */
+#define UART_MSR_CTS 0x10 /* Clear to Send */
+#define UART_MSR_DDCD 0x08 /* Delta DCD */
+#define UART_MSR_TERI 0x04 /* Trailing edge ring indicator */
+#define UART_MSR_DDSR 0x02 /* Delta DSR */
+#define UART_MSR_DCTS 0x01 /* Delta CTS */
+#define UART_MSR_ANY_DELTA 0x0F /* Any of the delta bits! */
+
+#define UART_SCR 7 /* I/O: Scratch Register */