LXR uboot/board/Marvell/common/ns16550.h

   1/*
   2 * NS16550 Serial Port
   3 * originally from linux source (arch/powerpc/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 *
  11 * further modified to support the DUART in the Galileo eval board
  12 * modifications (c) Josh Huber <huber@mclx.com>, Mission Critical Linux, Inc.
  13 */
  14
  15#ifndef __NS16550_H__
  16#define __NS16550_H__
  17
  18/* the padding is necessary because on the galileo board the UART is
  19   wired in with the 3 address lines shifted over by 2 bits */
  20struct NS16550
  21{
  22        unsigned char rbr;  /* 0 = 0-3*/
  23        int pad1:24;
  24
  25        unsigned char ier;  /* 1 = 4-7*/
  26        int pad2:24;
  27
  28        unsigned char fcr;  /* 2 = 8-b*/
  29        int pad3:24;
  30
  31        unsigned char lcr;  /* 3 = c-f*/
  32        int pad4:24;
  33
  34        unsigned char mcr;  /* 4 = 10-13*/
  35        int pad5:24;
  36
  37        unsigned char lsr;  /* 5 = 14-17*/
  38        int pad6:24;
  39
  40        unsigned char msr;  /* 6 =18-1b*/
  41        int pad7:24;
  42
  43        unsigned char scr;  /* 7 =1c-1f*/
  44        int pad8:24;
  45} __attribute__ ((packed));
  46
  47/* aliases */
  48#define thr rbr
  49#define iir fcr
  50#define dll rbr
  51#define dlm ier
  52
  53#define FCR_FIFO_EN     0x01    /*fifo enable*/
  54#define FCR_RXSR        0x02    /*receiver soft reset*/
  55#define FCR_TXSR        0x04    /*transmitter soft reset*/
  56
  57
  58#define MCR_DTR         0x01
  59#define MCR_RTS         0x02
  60#define MCR_DMA_EN      0x04
  61#define MCR_TX_DFR      0x08
  62
  63
  64#define LCR_WLS_MSK 0x03    /* character length slect mask*/
  65#define LCR_WLS_5   0x00    /* 5 bit character length */
  66#define LCR_WLS_6   0x01    /* 6 bit character length */
  67#define LCR_WLS_7   0x02    /* 7 bit character length */
  68#define LCR_WLS_8   0x03    /* 8 bit character length */
  69#define LCR_STB     0x04    /* Number of stop Bits, off = 1, on = 1.5 or 2) */
  70#define LCR_PEN     0x08    /* Parity eneble*/
  71#define LCR_EPS     0x10    /* Even Parity Select*/
  72#define LCR_STKP    0x20    /* Stick Parity*/
  73#define LCR_SBRK    0x40    /* Set Break*/
  74#define LCR_BKSE    0x80    /* Bank select enable*/
  75
  76#define LSR_DR      0x01    /* Data ready */
  77#define LSR_OE      0x02    /* Overrun */
  78#define LSR_PE      0x04    /* Parity error */
  79#define LSR_FE      0x08    /* Framing error */
  80#define LSR_BI      0x10    /* Break */
  81#define LSR_THRE    0x20    /* Xmit holding register empty */
  82#define LSR_TEMT    0x40    /* Xmitter empty */
  83#define LSR_ERR     0x80    /* Error */
  84
  85/* useful defaults for LCR*/
  86#define LCR_8N1     0x03
  87
  88
  89#define COM1 0x03F8
  90#define COM2 0x02F8
  91
  92volatile struct NS16550 * NS16550_init(int chan, int baud_divisor);
  93void NS16550_putc(volatile struct NS16550 *com_port, unsigned char c);
  94unsigned char NS16550_getc(volatile struct NS16550 *com_port);
  95int NS16550_tstc(volatile struct NS16550 *com_port);
  96void NS16550_reinit(volatile struct NS16550 *com_port, int baud_divisor);
  97
  98typedef struct NS16550 *NS16550_t;
  99
 100extern const NS16550_t COM_PORTS[];
 101
 102#endif
 103