2 * This file is licensed under
3 * the terms of the GNU General Public License version 2. This program
4 * is licensed "as is" without any warranty of any kind, whether express
8 * originally from linux source (arch/ppc/boot/ns16550.c)
9 * modified to use CFG_ISA_MEM and new defines
19 #define LCRVAL LCR_8N1 /* 8 data, 1 stop, no parity */
20 #define MCRVAL (MCR_DTR | MCR_RTS) /* RTS/DTR */
21 #define FCRVAL (FCR_FIFO_EN | FCR_RXSR | FCR_TXSR) /* Clear & enable FIFOs */
23 void NS16550_init (NS16550_t com_port, int baud_divisor)
27 com_port->mdr1 = 0x7; /* mode select reset TL16C750*/
29 com_port->lcr = LCR_BKSE | LCRVAL;
30 com_port->dll = baud_divisor & 0xff;
31 com_port->dlm = (baud_divisor >> 8) & 0xff;
32 com_port->lcr = LCRVAL;
33 com_port->mcr = MCRVAL;
34 com_port->fcr = FCRVAL;
35 #if defined(CONFIG_OMAP)
36 com_port->mdr1 = 0; /* select uart mode */
40 void NS16550_reinit (NS16550_t com_port, int baud_divisor)
43 com_port->lcr = LCR_BKSE;
44 com_port->dll = baud_divisor & 0xff;
45 com_port->dlm = (baud_divisor >> 8) & 0xff;
46 com_port->lcr = LCRVAL;
47 com_port->mcr = MCRVAL;
48 com_port->fcr = FCRVAL;
51 void NS16550_putc (NS16550_t com_port, char c)
53 while ((com_port->lsr & LSR_THRE) == 0);
57 char NS16550_getc (NS16550_t com_port)
59 while ((com_port->lsr & LSR_DR) == 0);
60 return (com_port->rbr);
63 int NS16550_tstc (NS16550_t com_port)
65 return ((com_port->lsr & LSR_DR) != 0);