board/bmw/ns16550.h

   1 /*
   2  * NS16550 Serial Port
   3  * originally from linux source (arch/ppc/boot/ns16550.h)
   4  * modified slightly to
   5  * have addresses as offsets from CONFIG_SYS_ISA_BASE
   6  * added a few more definitions
   7  * added prototypes for ns16550.c
   8  * reduced no of com ports to 2
   9  * modifications (c) Rob Taylor, Flying Pig Systems. 2000.
  10  * further modified to support the 8245 duart
  11  * modifications (c) Paul Jimenez, Musenki, Inc. 2001.
  12  */
  13
  14
  15 struct NS16550 {
  16         unsigned char rbrthrdlb;        /* 0 */
  17         unsigned char ierdmb;           /* 1 */
  18         unsigned char iirfcrafr;        /* 2 */
  19         unsigned char lcr;              /* 3 */
  20         unsigned char mcr;              /* 4 */
  21         unsigned char lsr;              /* 5 */
  22         unsigned char msr;              /* 6 */
  23         unsigned char scr;              /* 7 */
  24         unsigned char reserved[2];      /* 8 & 9 */
  25         unsigned char dsr;              /* 10 */
  26         unsigned char dcr;              /* 11 */
  27 };
  28
  29
  30 #define rbr rbrthrdlb
  31 #define thr rbrthrdlb
  32 #define dll rbrthrdlb
  33 #define ier ierdmb
  34 #define dlm ierdmb
  35 #define iir iirfcrafr
  36 #define fcr iirfcrafr
  37 #define afr iirfcrafr
  38
  39 #define FCR_FIFO_EN     0x01    /*fifo enable */
  40 #define FCR_RXSR        0x02    /*reciever soft reset */
  41 #define FCR_TXSR        0x04    /*transmitter soft reset */
  42 #define FCR_DMS         0x08    /* DMA Mode Select */
  43
  44 #define MCR_RTS         0x02    /* Readyu to Send */
  45 #define MCR_LOOP        0x10    /* Local loopback mode enable */
  46 /* #define MCR_DTR         0x01    noton 8245 duart */
  47 /* #define MCR_DMA_EN      0x04    noton 8245 duart */
  48 /* #define MCR_TX_DFR      0x08    noton 8245 duart */
  49
  50 #define LCR_WLS_MSK 0x03        /* character length slect mask */
  51 #define LCR_WLS_5   0x00        /* 5 bit character length */
  52 #define LCR_WLS_6   0x01        /* 6 bit character length */
  53 #define LCR_WLS_7   0x02        /* 7 bit character length */
  54 #define LCR_WLS_8   0x03        /* 8 bit character length */
  55 #define LCR_STB     0x04        /* Number of stop Bits, off = 1, on = 1.5 or 2) */
  56 #define LCR_PEN     0x08        /* Parity eneble */
  57 #define LCR_EPS     0x10        /* Even Parity Select */
  58 #define LCR_STKP    0x20        /* Stick Parity */
  59 #define LCR_SBRK    0x40        /* Set Break */
  60 #define LCR_BKSE    0x80        /* Bank select enable - aka DLAB on 8245 */
  61
  62 #define LSR_DR      0x01        /* Data ready */
  63 #define LSR_OE      0x02        /* Overrun */
  64 #define LSR_PE      0x04        /* Parity error */
  65 #define LSR_FE      0x08        /* Framing error */
  66 #define LSR_BI      0x10        /* Break */
  67 #define LSR_THRE    0x20        /* Xmit holding register empty */
  68 #define LSR_TEMT    0x40        /* Xmitter empty */
  69 #define LSR_ERR     0x80        /* Error */
  70
  71 /* useful defaults for LCR*/
  72 #define LCR_8N1     0x03
  73
  74
  75 volatile struct NS16550 *NS16550_init (int chan, int baud_divisor);
  76 void NS16550_putc (volatile struct NS16550 *com_port, unsigned char c);
  77 unsigned char NS16550_getc (volatile struct NS16550 *com_port);
  78 int NS16550_tstc (volatile struct NS16550 *com_port);
  79 void NS16550_reinit (volatile struct NS16550 *com_port, int baud_divisor);