/* * COM1 NS16550 support * originally from linux source (arch/powerpc/boot/ns16550.c) * modified to use CONFIG_SYS_ISA_MEM and new defines */ #include <config.h> #include "ns16550.h" typedef struct NS16550 *NS16550_t; const NS16550_t COM_PORTS[] = { (NS16550_t) ((CONFIG_SYS_EUMB_ADDR) + 0x4500), (NS16550_t) ((CONFIG_SYS_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); }