diff --git a/drivers/char/riscom8_reg.h b/drivers/char/riscom8_reg.h
new file mode 100644
index 0000000..a32475e
--- /dev/null
+++ b/drivers/char/riscom8_reg.h
@@ -0,0 +1,254 @@
+/*
+ *      linux/drivers/char/riscom8_reg.h  -- RISCom/8 multiport serial driver.
+ */
+
+/*
+ * Definitions for RISCom/8 Async Mux card by SDL Communications, Inc.
+ */
+
+/*
+ * Address mapping between Cirrus Logic CD180 chip internal registers
+ * and ISA port addresses:
+ *
+ *      CL-CD180                A6  A5   A4  A3                      A2 A1 A0
+ *      ISA             A15 A14 A13 A12  A11 A10 A9 A8  A7 A6 A5 A4  A3 A2 A1 A0
+ */
+#define RC_TO_ISA(r)    ((((r)&0x07)<<1) | (((r)&~0x07)<<7))
+
+
+/* RISCom/8 On-Board Registers (assuming address translation) */
+
+#define RC_RI           0x100   /* Ring Indicator Register (R/O)           */
+#define RC_DTR          0x100   /* DTR Register (W/O)                      */
+#define RC_BSR          0x101   /* Board Status Register (R/O)             */
+#define RC_CTOUT        0x101   /* Clear Timeout (W/O)                     */
+
+
+/* Board Status Register */
+
+#define RC_BSR_TOUT     0x08     /* Hardware Timeout                       */
+#define RC_BSR_RINT     0x04     /* Receiver Interrupt                     */
+#define RC_BSR_TINT     0x02     /* Transmitter Interrupt                  */
+#define RC_BSR_MINT     0x01     /* Modem Ctl Interrupt                    */
+
+
+/* On-board oscillator frequency (in Hz) */
+#define RC_OSCFREQ      9830400
+
+/* Values of choice for Interrupt ACKs */
+#define RC_ACK_MINT     0x81    /* goes to PILR1                           */
+#define RC_ACK_RINT     0x82    /* goes to PILR3                           */
+#define RC_ACK_TINT     0x84    /* goes to PILR2                           */
+
+/* Chip ID (sorry, only one chip now) */
+#define RC_ID           0x10
+
+/* Definitions for Cirrus Logic CL-CD180 8-port async mux chip */
+ 
+#define CD180_NCH       8       /* Total number of channels                */
+#define CD180_TPC       16      /* Ticks per character                     */
+#define CD180_NFIFO	8	/* TX FIFO size                            */
+
+
+/* Global registers */
+
+#define CD180_GIVR      0x40    /* Global Interrupt Vector Register        */
+#define CD180_GICR      0x41    /* Global Interrupting Channel Register    */
+#define CD180_PILR1     0x61    /* Priority Interrupt Level Register 1     */
+#define CD180_PILR2     0x62    /* Priority Interrupt Level Register 2     */
+#define CD180_PILR3     0x63    /* Priority Interrupt Level Register 3     */
+#define CD180_CAR       0x64    /* Channel Access Register                 */
+#define CD180_GFRCR     0x6b    /* Global Firmware Revision Code Register  */
+#define CD180_PPRH      0x70    /* Prescaler Period Register High          */
+#define CD180_PPRL      0x71    /* Prescaler Period Register Low           */
+#define CD180_RDR       0x78    /* Receiver Data Register                  */
+#define CD180_RCSR      0x7a    /* Receiver Character Status Register      */
+#define CD180_TDR       0x7b    /* Transmit Data Register                  */
+#define CD180_EOIR      0x7f    /* End of Interrupt Register               */
+
+
+/* Channel Registers */
+
+#define CD180_CCR       0x01    /* Channel Command Register                */
+#define CD180_IER       0x02    /* Interrupt Enable Register               */
+#define CD180_COR1      0x03    /* Channel Option Register 1               */
+#define CD180_COR2      0x04    /* Channel Option Register 2               */
+#define CD180_COR3      0x05    /* Channel Option Register 3               */
+#define CD180_CCSR      0x06    /* Channel Control Status Register         */
+#define CD180_RDCR      0x07    /* Receive Data Count Register             */
+#define CD180_SCHR1     0x09    /* Special Character Register 1            */
+#define CD180_SCHR2     0x0a    /* Special Character Register 2            */
+#define CD180_SCHR3     0x0b    /* Special Character Register 3            */
+#define CD180_SCHR4     0x0c    /* Special Character Register 4            */
+#define CD180_MCOR1     0x10    /* Modem Change Option 1 Register          */
+#define CD180_MCOR2     0x11    /* Modem Change Option 2 Register          */
+#define CD180_MCR       0x12    /* Modem Change Register                   */
+#define CD180_RTPR      0x18    /* Receive Timeout Period Register         */
+#define CD180_MSVR      0x28    /* Modem Signal Value Register             */
+#define CD180_RBPRH     0x31    /* Receive Baud Rate Period Register High  */
+#define CD180_RBPRL     0x32    /* Receive Baud Rate Period Register Low   */
+#define CD180_TBPRH     0x39    /* Transmit Baud Rate Period Register High */
+#define CD180_TBPRL     0x3a    /* Transmit Baud Rate Period Register Low  */
+
+
+/* Global Interrupt Vector Register (R/W) */
+
+#define GIVR_ITMASK     0x07     /* Interrupt type mask                     */
+#define  GIVR_IT_MODEM   0x01    /* Modem Signal Change Interrupt           */
+#define  GIVR_IT_TX      0x02    /* Transmit Data Interrupt                 */
+#define  GIVR_IT_RCV     0x03    /* Receive Good Data Interrupt             */
+#define  GIVR_IT_REXC    0x07    /* Receive Exception Interrupt             */
+
+
+/* Global Interrupt Channel Register (R/W) */
+ 
+#define GICR_CHAN       0x1c    /* Channel Number Mask                     */
+#define GICR_CHAN_OFF   2       /* Channel Number Offset                   */
+
+
+/* Channel Address Register (R/W) */
+
+#define CAR_CHAN        0x07    /* Channel Number Mask                     */
+#define CAR_A7          0x08    /* A7 Address Extension (unused)           */
+
+
+/* Receive Character Status Register (R/O) */
+
+#define RCSR_TOUT       0x80    /* Rx Timeout                              */
+#define RCSR_SCDET      0x70    /* Special Character Detected Mask         */
+#define  RCSR_NO_SC      0x00   /* No Special Characters Detected          */
+#define  RCSR_SC_1       0x10   /* Special Char 1 (or 1 & 3) Detected      */
+#define  RCSR_SC_2       0x20   /* Special Char 2 (or 2 & 4) Detected      */
+#define  RCSR_SC_3       0x30   /* Special Char 3 Detected                 */
+#define  RCSR_SC_4       0x40   /* Special Char 4 Detected                 */
+#define RCSR_BREAK      0x08    /* Break has been detected                 */
+#define RCSR_PE         0x04    /* Parity Error                            */
+#define RCSR_FE         0x02    /* Frame Error                             */
+#define RCSR_OE         0x01    /* Overrun Error                           */
+
+
+/* Channel Command Register (R/W) (commands in groups can be OR-ed) */
+
+#define CCR_HARDRESET   0x81    /* Reset the chip                          */
+
+#define CCR_SOFTRESET   0x80    /* Soft Channel Reset                      */
+
+#define CCR_CORCHG1     0x42    /* Channel Option Register 1 Changed       */
+#define CCR_CORCHG2     0x44    /* Channel Option Register 2 Changed       */
+#define CCR_CORCHG3     0x48    /* Channel Option Register 3 Changed       */
+
+#define CCR_SSCH1       0x21    /* Send Special Character 1                */
+
+#define CCR_SSCH2       0x22    /* Send Special Character 2                */
+
+#define CCR_SSCH3       0x23    /* Send Special Character 3                */
+
+#define CCR_SSCH4       0x24    /* Send Special Character 4                */
+
+#define CCR_TXEN        0x18    /* Enable Transmitter                      */
+#define CCR_RXEN        0x12    /* Enable Receiver                         */
+
+#define CCR_TXDIS       0x14    /* Disable Transmitter                     */
+#define CCR_RXDIS       0x11    /* Disable Receiver                        */
+
+
+/* Interrupt Enable Register (R/W) */
+
+#define IER_DSR         0x80    /* Enable interrupt on DSR change          */
+#define IER_CD          0x40    /* Enable interrupt on CD change           */
+#define IER_CTS         0x20    /* Enable interrupt on CTS change          */
+#define IER_RXD         0x10    /* Enable interrupt on Receive Data        */
+#define IER_RXSC        0x08    /* Enable interrupt on Receive Spec. Char  */
+#define IER_TXRDY       0x04    /* Enable interrupt on TX FIFO empty       */
+#define IER_TXEMPTY     0x02    /* Enable interrupt on TX completely empty */
+#define IER_RET         0x01    /* Enable interrupt on RX Exc. Timeout     */
+
+
+/* Channel Option Register 1 (R/W) */
+
+#define COR1_ODDP       0x80    /* Odd Parity                              */
+#define COR1_PARMODE    0x60    /* Parity Mode mask                        */
+#define  COR1_NOPAR      0x00   /* No Parity                               */
+#define  COR1_FORCEPAR   0x20   /* Force Parity                            */
+#define  COR1_NORMPAR    0x40   /* Normal Parity                           */
+#define COR1_IGNORE     0x10    /* Ignore Parity on RX                     */
+#define COR1_STOPBITS   0x0c    /* Number of Stop Bits                     */
+#define  COR1_1SB        0x00   /* 1 Stop Bit                              */
+#define  COR1_15SB       0x04   /* 1.5 Stop Bits                           */
+#define  COR1_2SB        0x08   /* 2 Stop Bits                             */
+#define COR1_CHARLEN    0x03    /* Character Length                        */
+#define  COR1_5BITS      0x00   /* 5 bits                                  */
+#define  COR1_6BITS      0x01   /* 6 bits                                  */
+#define  COR1_7BITS      0x02   /* 7 bits                                  */
+#define  COR1_8BITS      0x03   /* 8 bits                                  */
+
+
+/* Channel Option Register 2 (R/W) */
+
+#define COR2_IXM        0x80    /* Implied XON mode                        */
+#define COR2_TXIBE      0x40    /* Enable In-Band (XON/XOFF) Flow Control  */
+#define COR2_ETC        0x20    /* Embedded Tx Commands Enable             */
+#define COR2_LLM        0x10    /* Local Loopback Mode                     */
+#define COR2_RLM        0x08    /* Remote Loopback Mode                    */
+#define COR2_RTSAO      0x04    /* RTS Automatic Output Enable             */
+#define COR2_CTSAE      0x02    /* CTS Automatic Enable                    */
+#define COR2_DSRAE      0x01    /* DSR Automatic Enable                    */
+
+
+/* Channel Option Register 3 (R/W) */
+
+#define COR3_XONCH      0x80    /* XON is a pair of characters (1 & 3)     */
+#define COR3_XOFFCH     0x40    /* XOFF is a pair of characters (2 & 4)    */
+#define COR3_FCT        0x20    /* Flow-Control Transparency Mode          */
+#define COR3_SCDE       0x10    /* Special Character Detection Enable      */
+#define COR3_RXTH       0x0f    /* RX FIFO Threshold value (1-8)           */
+
+
+/* Channel Control Status Register (R/O) */
+
+#define CCSR_RXEN       0x80    /* Receiver Enabled                        */
+#define CCSR_RXFLOFF    0x40    /* Receive Flow Off (XOFF was sent)        */
+#define CCSR_RXFLON     0x20    /* Receive Flow On (XON was sent)          */
+#define CCSR_TXEN       0x08    /* Transmitter Enabled                     */
+#define CCSR_TXFLOFF    0x04    /* Transmit Flow Off (got XOFF)            */
+#define CCSR_TXFLON     0x02    /* Transmit Flow On (got XON)              */
+
+
+/* Modem Change Option Register 1 (R/W) */
+
+#define MCOR1_DSRZD     0x80    /* Detect 0->1 transition of DSR           */
+#define MCOR1_CDZD      0x40    /* Detect 0->1 transition of CD            */
+#define MCOR1_CTSZD     0x20    /* Detect 0->1 transition of CTS           */
+#define MCOR1_DTRTH     0x0f    /* Auto DTR flow control Threshold (1-8)   */
+#define  MCOR1_NODTRFC   0x0     /* Automatic DTR flow control disabled     */
+
+
+/* Modem Change Option Register 2 (R/W) */
+
+#define MCOR2_DSROD     0x80    /* Detect 1->0 transition of DSR           */
+#define MCOR2_CDOD      0x40    /* Detect 1->0 transition of CD            */
+#define MCOR2_CTSOD     0x20    /* Detect 1->0 transition of CTS           */
+
+
+/* Modem Change Register (R/W) */
+
+#define MCR_DSRCHG      0x80    /* DSR Changed                             */
+#define MCR_CDCHG       0x40    /* CD Changed                              */
+#define MCR_CTSCHG      0x20    /* CTS Changed                             */
+
+
+/* Modem Signal Value Register (R/W) */
+
+#define MSVR_DSR        0x80    /* Current state of DSR input              */
+#define MSVR_CD         0x40    /* Current state of CD input               */
+#define MSVR_CTS        0x20    /* Current state of CTS input              */
+#define MSVR_DTR        0x02    /* Current state of DTR output             */
+#define MSVR_RTS        0x01    /* Current state of RTS output             */
+
+
+/* Escape characters */
+
+#define CD180_C_ESC     0x00    /* Escape character                        */
+#define CD180_C_SBRK    0x81    /* Start sending BREAK                     */
+#define CD180_C_DELAY   0x82    /* Delay output                            */
+#define CD180_C_EBRK    0x83    /* Stop sending BREAK                      */