board/Marvell/common/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  *
  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 */
  20 struct 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    /*reciever 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
  92 volatile struct NS16550 * NS16550_init(int chan, int baud_divisor);
  93 void NS16550_putc(volatile struct NS16550 *com_port, unsigned char c);
  94 unsigned char NS16550_getc(volatile struct NS16550 *com_port);
  95 int NS16550_tstc(volatile struct NS16550 *com_port);
  96 void NS16550_reinit(volatile struct NS16550 *com_port, int baud_divisor);
  97
  98 typedef struct NS16550 *NS16550_t;
  99
 100 extern const NS16550_t COM_PORTS[];
 101
 102 #endif