* Code cleanup (ARM mostly)

* Patch by Curt Brune, 17 May 2004:
  - Add support for Samsung S3C4510B CPU (ARM7tdmi based SoC)
  - Add support for ESPD-Inc. EVB4510 Board

1 files changed, 216 insertions, 0 deletions

diff --git a/drivers/s3c4510b_uart.c b/drivers/s3c4510b_uart.c
new file mode 100644
index 0000000..44b96a9
--- /dev/null
+++ b/drivers/s3c4510b_uart.c
@@ -0,0 +1,216 @@
+/*
+ * 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"
+
+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)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+
+	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