From 71fc6c551dc7951576f636a8594d623c0cb48938 Mon Sep 17 00:00:00 2001 From: wdenk Date: Tue, 6 Aug 2002 19:52:25 +0000 Subject: Initial revision --- board/bmw/ns16550.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 60 insertions(+) create mode 100644 board/bmw/ns16550.c (limited to 'board/bmw/ns16550.c') diff --git a/board/bmw/ns16550.c b/board/bmw/ns16550.c new file mode 100644 index 0000000000..b6b6f4c99a --- /dev/null +++ b/board/bmw/ns16550.c @@ -0,0 +1,60 @@ +/* + * COM1 NS16550 support + * originally from linux source (arch/ppc/boot/ns16550.c) + * modified to use CFG_ISA_MEM and new defines + */ + +#include +#include "ns16550.h" + +typedef struct NS16550 *NS16550_t; + +const NS16550_t COM_PORTS[] = { (NS16550_t) ((CFG_EUMB_ADDR) + 0x4500), (NS16550_t) ((CFG_EUMB_ADDR) + 0x4600)}; + +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_RTS; /* RTS/DTR */ + com_port->fcr = FCR_FIFO_EN | FCR_RXSR | FCR_TXSR; /* Clear & enable FIFOs */ +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_RTS; /* RTS/DTR */ + com_port->fcr = FCR_FIFO_EN | FCR_RXSR | FCR_TXSR; /* Clear & enable FIFOs */ +} + +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); +} + + + -- cgit v1.2.3