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

   1/*
   2 * COM1 NS16550 support
   3 * originally from linux source (arch/powerpc/boot/ns16550.c)
   4 * modified to use CONFIG_SYS_ISA_MEM and new defines
   5 *
   6 * further modified by Josh Huber <huber@mclx.com> to support
   7 * the DUART on the Galileo Eval board. (db64360)
   8 */
   9
  10#include <config.h>
  11#include "ns16550.h"
  12
  13#ifdef ZUMA_NTL
  14/* no 16550 device */
  15#else
  16const NS16550_t COM_PORTS[] = { (NS16550_t) (CONFIG_SYS_DUART_IO + 0),
  17        (NS16550_t) (CONFIG_SYS_DUART_IO + 0x20)
  18};
  19
  20volatile struct NS16550 *NS16550_init (int chan, int baud_divisor)
  21{
  22        volatile struct NS16550 *com_port;
  23
  24        com_port = (struct NS16550 *) COM_PORTS[chan];
  25        com_port->ier = 0x00;
  26        com_port->lcr = LCR_BKSE;       /* Access baud rate */
  27        com_port->dll = baud_divisor & 0xff;    /* 9600 baud */
  28        com_port->dlm = (baud_divisor >> 8) & 0xff;
  29        com_port->lcr = LCR_8N1;        /* 8 data, 1 stop, no parity */
  30        com_port->mcr = MCR_DTR | MCR_RTS;      /* RTS/DTR */
  31
  32        /* Clear & enable FIFOs */
  33        com_port->fcr = FCR_FIFO_EN | FCR_RXSR | FCR_TXSR;
  34        return (com_port);
  35}
  36
  37void NS16550_reinit (volatile struct NS16550 *com_port, int baud_divisor)
  38{
  39        com_port->ier = 0x00;
  40        com_port->lcr = LCR_BKSE;       /* Access baud rate */
  41        com_port->dll = baud_divisor & 0xff;    /* 9600 baud */
  42        com_port->dlm = (baud_divisor >> 8) & 0xff;
  43        com_port->lcr = LCR_8N1;        /* 8 data, 1 stop, no parity */
  44        com_port->mcr = MCR_DTR | MCR_RTS;      /* RTS/DTR */
  45
  46        /* Clear & enable FIFOs */
  47        com_port->fcr = FCR_FIFO_EN | FCR_RXSR | FCR_TXSR;
  48}
  49
  50void NS16550_putc (volatile struct NS16550 *com_port, unsigned char c)
  51{
  52        while ((com_port->lsr & LSR_THRE) == 0);
  53        com_port->thr = c;
  54}
  55
  56unsigned char NS16550_getc (volatile struct NS16550 *com_port)
  57{
  58        while ((com_port->lsr & LSR_DR) == 0);
  59        return (com_port->rbr);
  60}
  61
  62int NS16550_tstc (volatile struct NS16550 *com_port)
  63{
  64        return ((com_port->lsr & LSR_DR) != 0);
  65}
  66#endif
  67