3 * originally from linux source (arch/powerpc/boot/ns16550.c)
4 * modified to use CONFIG_SYS_ISA_MEM and new defines
6 * further modified by Josh Huber <huber@mclx.com> to support
7 * the DUART on the Galileo Eval board. (db64360)
16 const NS16550_t COM_PORTS[] = { (NS16550_t) (CONFIG_SYS_DUART_IO + 0),
17 (NS16550_t) (CONFIG_SYS_DUART_IO + 0x20)
20 volatile struct NS16550 *NS16550_init (int chan, int baud_divisor)
22 volatile struct NS16550 *com_port;
24 com_port = (struct NS16550 *) COM_PORTS[chan];
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 */
32 /* Clear & enable FIFOs */
33 com_port->fcr = FCR_FIFO_EN | FCR_RXSR | FCR_TXSR;
37 void NS16550_reinit (volatile struct NS16550 *com_port, int baud_divisor)
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 */
46 /* Clear & enable FIFOs */
47 com_port->fcr = FCR_FIFO_EN | FCR_RXSR | FCR_TXSR;
50 void NS16550_putc (volatile struct NS16550 *com_port, unsigned char c)
52 while ((com_port->lsr & LSR_THRE) == 0);
56 unsigned char NS16550_getc (volatile struct NS16550 *com_port)
58 while ((com_port->lsr & LSR_DR) == 0);
59 return (com_port->rbr);
62 int NS16550_tstc (volatile struct NS16550 *com_port)
64 return ((com_port->lsr & LSR_DR) != 0);