board/bmw/ns16550.c

   1 /*
   2  * COM1 NS16550 support
   3  * originally from linux source (arch/ppc/boot/ns16550.c)
   4  * modified to use CFG_ISA_MEM and new defines
   5  */
   6
   7 #include <config.h>
   8 #include "ns16550.h"
   9
  10 typedef struct NS16550 *NS16550_t;
  11
  12 const NS16550_t COM_PORTS[] = { (NS16550_t) ((CFG_EUMB_ADDR) + 0x4500), (NS16550_t) ((CFG_EUMB_ADDR) + 0x4600)};
  13
  14 volatile struct NS16550 *
  15 NS16550_init(int chan, int baud_divisor)
  16 {
  17  volatile struct NS16550 *com_port;
  18  com_port = (struct NS16550 *) COM_PORTS[chan];
  19  com_port->ier = 0x00;
  20  com_port->lcr = LCR_BKSE;              /* Access baud rate */
  21  com_port->dll = baud_divisor & 0xff;   /* 9600 baud */
  22  com_port->dlm = (baud_divisor >> 8) & 0xff;
  23  com_port->lcr = LCR_8N1;               /* 8 data, 1 stop, no parity */
  24  com_port->mcr = MCR_RTS;     /* RTS/DTR */
  25  com_port->fcr = FCR_FIFO_EN | FCR_RXSR | FCR_TXSR;                  /* Clear & enable FIFOs */
  26 return (com_port);
  27 }
  28
  29 void
  30 NS16550_reinit(volatile struct NS16550 *com_port, int baud_divisor)
  31 {
  32  com_port->ier = 0x00;
  33  com_port->lcr = LCR_BKSE;              /* Access baud rate */
  34  com_port->dll = baud_divisor & 0xff;   /* 9600 baud */
  35  com_port->dlm = (baud_divisor >> 8) & 0xff;
  36  com_port->lcr = LCR_8N1;               /* 8 data, 1 stop, no parity */
  37  com_port->mcr = MCR_RTS;     /* RTS/DTR */
  38  com_port->fcr = FCR_FIFO_EN | FCR_RXSR | FCR_TXSR;                  /* Clear & enable FIFOs */
  39 }
  40
  41 void NS16550_putc(volatile struct NS16550 *com_port, unsigned char c)
  42 {
  43  while ((com_port->lsr & LSR_THRE) == 0) ;
  44  com_port->thr = c;
  45 }
  46
  47 unsigned char
  48 NS16550_getc(volatile struct NS16550 *com_port)
  49 {
  50  while ((com_port->lsr & LSR_DR) == 0) ;
  51  return (com_port->rbr);
  52 }
  53
  54 int NS16550_tstc(volatile struct NS16550 *com_port)
  55 {
  56  return ((com_port->lsr & LSR_DR) != 0);
  57 }