| /* |
| * This file is licensed under |
| * the terms of the GNU General Public License version 2. This program |
| * is licensed "as is" without any warranty of any kind, whether express |
| * or implied. |
| * |
| * COM1 NS16550 support |
| * originally from linux source (arch/ppc/boot/ns16550.c) |
| * modified to use CFG_ISA_MEM and new defines |
| */ |
| |
| #include <config.h> |
| |
| #ifdef CFG_PRINTF |
| #ifdef CFG_NS16550 |
| |
| #include <ns16550.h> |
| |
| #define LCRVAL LCR_8N1 /* 8 data, 1 stop, no parity */ |
| #define MCRVAL (MCR_DTR | MCR_RTS) /* RTS/DTR */ |
| #define FCRVAL (FCR_FIFO_EN | FCR_RXSR | FCR_TXSR) /* Clear & enable FIFOs */ |
| |
| void NS16550_init (NS16550_t com_port, int baud_divisor) |
| { |
| com_port->ier = 0x00; |
| #ifdef CONFIG_OMAP |
| com_port->mdr1 = 0x7; /* mode select reset TL16C750*/ |
| #endif |
| com_port->lcr = LCR_BKSE | LCRVAL; |
| com_port->dll = baud_divisor & 0xff; |
| com_port->dlm = (baud_divisor >> 8) & 0xff; |
| com_port->lcr = LCRVAL; |
| com_port->mcr = MCRVAL; |
| com_port->fcr = FCRVAL; |
| #if defined(CONFIG_OMAP) |
| com_port->mdr1 = 0; /* select uart mode */ |
| #endif |
| } |
| |
| void NS16550_reinit (NS16550_t com_port, int baud_divisor) |
| { |
| com_port->ier = 0x00; |
| com_port->lcr = LCR_BKSE; |
| com_port->dll = baud_divisor & 0xff; |
| com_port->dlm = (baud_divisor >> 8) & 0xff; |
| com_port->lcr = LCRVAL; |
| com_port->mcr = MCRVAL; |
| com_port->fcr = FCRVAL; |
| } |
| |
| void NS16550_putc (NS16550_t com_port, char c) |
| { |
| while ((com_port->lsr & LSR_THRE) == 0); |
| com_port->thr = c; |
| } |
| |
| char NS16550_getc (NS16550_t com_port) |
| { |
| while ((com_port->lsr & LSR_DR) == 0); |
| return (com_port->rbr); |
| } |
| |
| int NS16550_tstc (NS16550_t com_port) |
| { |
| return ((com_port->lsr & LSR_DR) != 0); |
| } |
| |
| #endif |
| #endif |