/* * Copyright (c) 2004 Cucy Systems (http://www.cucy.com) * Curt Brune <curt@cucy.com> * * (C) Copyright 2004 * DAVE Srl * http://www.dave-tech.it * http://www.wawnet.biz * mailto:info@wawnet.biz * * (C) Copyright 2002-2004 * Wolfgang Denk, DENX Software Engineering, <wd@denx.de> * * (C) Copyright 2002 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> * Marius Groeger <mgroeger@sysgo.de> * * (C) Copyright 2002 * Sysgo Real-Time Solutions, GmbH <www.elinos.com> * Alex Zuepke <azu@sysgo.de> * * Copyright (C) 1999 2000 2001 Erik Mouw (J.A.K.Mouw@its.tudelft.nl) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * * MODULE: $Id:$ * Description: UART/Serial interface for Samsung S3C4510B SoC * Runtime Env: ARM7TDMI * Change History: * 03-02-04 Create (Curt Brune) curt@cucy.com * */ #include <common.h> #ifdef CONFIG_DRIVER_S3C4510_UART #include <asm/hardware.h> #include "s3c4510b_uart.h" DECLARE_GLOBAL_DATA_PTR; static UART *uart; /* flush serial input queue. returns 0 on success or negative error * number otherwise */ static int serial_flush_input(void) { volatile u32 tmp; /* keep on reading as long as the receiver is not empty */ while( uart->m_stat.bf.rxReady) { tmp = uart->m_rx; } return 0; } /* flush output queue. returns 0 on success or negative error number * otherwise */ static int serial_flush_output(void) { /* wait until the transmitter is no longer busy */ while( !uart->m_stat.bf.txBufEmpty); return 0; } void serial_setbrg (void) { UART_LINE_CTRL ulctrl; UART_CTRL uctrl; UART_BAUD_DIV ubd; serial_flush_output(); serial_flush_input(); /* control register */ uctrl.ui = 0x0; uctrl.bf.rxMode = 0x1; uctrl.bf.rxIrq = 0x0; uctrl.bf.txMode = 0x1; uctrl.bf.DSR = 0x0; uctrl.bf.sendBreak = 0x0; uctrl.bf.loopBack = 0x0; uart->m_ctrl.ui = uctrl.ui; /* line control register */ ulctrl.ui = 0x0; ulctrl.bf.wordLen = 0x3; /* 8 bit data */ ulctrl.bf.nStop = 0x0; /* 1 stop bit */ ulctrl.bf.parity = 0x0; /* no parity */ ulctrl.bf.clk = 0x0; /* internal clock */ ulctrl.bf.infra_red = 0x0; /* no infra_red */ uart->m_lineCtrl.ui = ulctrl.ui; ubd.ui = 0x0; /* see table on page 10-15 in SAMSUNG S3C4510B manual */ /* get correct divisor */ switch(gd->baudrate) { case 1200: ubd.bf.cnt0 = 1301; break; case 2400: ubd.bf.cnt0 = 650; break; case 4800: ubd.bf.cnt0 = 324; break; case 9600: ubd.bf.cnt0 = 162; break; case 19200: ubd.bf.cnt0 = 80; break; case 38400: ubd.bf.cnt0 = 40; break; case 57600: ubd.bf.cnt0 = 26; break; case 115200: ubd.bf.cnt0 = 13; break; } uart->m_baudDiv.ui = ubd.ui; uart->m_baudCnt = 0x0; uart->m_baudClk = 0x0; } /* * Initialise the serial port with the given baudrate. The settings * are always 8 data bits, no parity, 1 stop bit, no start bits. * */ int serial_init (void) { #if CONFIG_SERIAL1 == 1 uart = (UART *)UART0_BASE; #elif CONFIG_SERIAL1 == 2 uart = (UART *)UART1_BASE; #else #error CONFIG_SERIAL1 not equal to 1 or 2 #endif serial_setbrg (); return (0); } /* * Output a single byte to the serial port. */ void serial_putc (const char c) { /* wait for room in the transmit FIFO */ while( !uart->m_stat.bf.txBufEmpty); uart->m_tx = c; /* to be polite with serial console add a line feed to the carriage return character */ if (c=='\n') serial_putc('\r'); } /* * Test if an input byte is ready from the serial port. Returns non-zero on * success, 0 otherwise. */ int serial_tstc (void) { return uart->m_stat.bf.rxReady; } /* * Read a single byte from the serial port. Returns 1 on success, 0 * otherwise. When the function is succesfull, the character read is * written into its argument c. */ int serial_getc (void) { int rv; for(;;) { rv = serial_tstc(); if (rv) { return uart->m_rx & 0xFF; } } } void serial_puts (const char *s) { while (*s) { serial_putc (*s++); } /* busy wait for tx complete */ while ( !uart->m_stat.bf.txComplete); /* clear break */ uart->m_ctrl.bf.sendBreak = 0; } #endif