117 lines
2.8 KiB
C
117 lines
2.8 KiB
C
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/*
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* serial.c -- KS8695 serial driver
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*
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* (C) Copyright 2004, Greg Ungerer <greg.ungerer@opengear.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/arch/platform.h>
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#ifndef CONFIG_SERIAL1
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#error "Bad: you didn't configure serial ..."
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#endif
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/*
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* Define the UART hardware register access structure.
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*/
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struct ks8695uart {
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unsigned int RX; /* 0x00 - Receive data (r) */
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unsigned int TX; /* 0x04 - Transmit data (w) */
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unsigned int FCR; /* 0x08 - Fifo Control (r/w) */
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unsigned int LCR; /* 0x0c - Line Control (r/w) */
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unsigned int MCR; /* 0x10 - Modem Control (r/w) */
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unsigned int LSR; /* 0x14 - Line Status (r/w) */
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unsigned int MSR; /* 0x18 - Modem Status (r/w) */
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unsigned int BD; /* 0x1c - Baud Rate (r/w) */
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unsigned int SR; /* 0x20 - Status (r/w) */
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};
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#define KS8695_UART_ADDR ((void *) (KS8695_IO_BASE + KS8695_UART_RX_BUFFER))
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#define KS8695_UART_CLK 25000000
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/*
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* Under some circumstances we want to be "quiet" and not issue any
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* serial output - though we want u-boot to otherwise work and behave
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* the same. By default be noisy.
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*/
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int serial_console = 1;
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void serial_setbrg(void)
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{
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DECLARE_GLOBAL_DATA_PTR;
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volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
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/* Set to global baud rate and 8 data bits, no parity, 1 stop bit*/
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uartp->BD = KS8695_UART_CLK / gd->baudrate;
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uartp->LCR = KS8695_UART_LINEC_WLEN8;
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}
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int serial_init(void)
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{
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serial_console = 1;
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serial_setbrg();
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return 0;
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}
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void serial_raw_putc(const char c)
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{
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volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
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int i;
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for (i = 0; (i < 0x100000); i++) {
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if (uartp->LSR & KS8695_UART_LINES_TXFE)
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break;
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}
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uartp->TX = c;
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}
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void serial_putc(const char c)
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{
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if (serial_console) {
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serial_raw_putc(c);
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if (c == '\n')
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serial_raw_putc('\r');
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}
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}
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int serial_tstc(void)
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{
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volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
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if (serial_console)
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return ((uartp->LSR & KS8695_UART_LINES_RXFE) ? 1 : 0);
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return 0;
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}
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void serial_puts(const char *s)
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{
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char c;
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while ((c = *s++) != 0)
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serial_putc(c);
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}
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int serial_getc(void)
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{
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volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
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while ((uartp->LSR & KS8695_UART_LINES_RXFE) == 0)
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;
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return (uartp->RX);
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}
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