/* * COM1 NS16550 support * originally from linux source (arch/ppc/boot/ns16550.c) * modified to use CFG_ISA_MEM and new defines * * further modified by Josh Huber <huber@mclx.com> to support * the DUART on the Galileo Eval board. (db64360) */#include <config.h>#include "ns16550.h"#ifdef ZUMA_NTL/* no 16550 device */#elseconst NS16550_t COM_PORTS[] = { (NS16550_t) (CFG_DUART_IO + 0),	(NS16550_t) (CFG_DUART_IO + 0x20)};volatile struct NS16550 *NS16550_init (int chan, int baud_divisor){	volatile struct NS16550 *com_port;	com_port = (struct NS16550 *) COM_PORTS[chan];	com_port->ier = 0x00;	com_port->lcr = LCR_BKSE;	/* Access baud rate */	com_port->dll = baud_divisor & 0xff;	/* 9600 baud */	com_port->dlm = (baud_divisor >> 8) & 0xff;	com_port->lcr = LCR_8N1;	/* 8 data, 1 stop, no parity */	com_port->mcr = MCR_DTR | MCR_RTS;	/* RTS/DTR */	/* Clear & enable FIFOs */	com_port->fcr = FCR_FIFO_EN | FCR_RXSR | FCR_TXSR;	return (com_port);}void NS16550_reinit (volatile struct NS16550 *com_port, int baud_divisor){	com_port->ier = 0x00;	com_port->lcr = LCR_BKSE;	/* Access baud rate */	com_port->dll = baud_divisor & 0xff;	/* 9600 baud */	com_port->dlm = (baud_divisor >> 8) & 0xff;	com_port->lcr = LCR_8N1;	/* 8 data, 1 stop, no parity */	com_port->mcr = MCR_DTR | MCR_RTS;	/* RTS/DTR */	/* Clear & enable FIFOs */	com_port->fcr = FCR_FIFO_EN | FCR_RXSR | FCR_TXSR;}void NS16550_putc (volatile struct NS16550 *com_port, unsigned char c){	while ((com_port->lsr & LSR_THRE) == 0);	com_port->thr = c;}unsigned char NS16550_getc (volatile struct NS16550 *com_port){	while ((com_port->lsr & LSR_DR) == 0);	return (com_port->rbr);}int NS16550_tstc (volatile struct NS16550 *com_port){	return ((com_port->lsr & LSR_DR) != 0);}#endif