s3c44b0: move serial driver to drivers/serial

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

1 files changed, 218 insertions, 0 deletions

diff --git a/drivers/serial/serial_s3c44b0.c b/drivers/serial/serial_s3c44b0.c
new file mode 100644
index 0000000..95d0266
--- /dev/null
+++ b/drivers/serial/serial_s3c44b0.c
@@ -0,0 +1,218 @@
+/*
+ * (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
+ *
+ */
+
+#include <common.h>
+#include <asm/hardware.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* 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(UTRSTAT0&0x01) {
+		tmp = REGB(URXH0);
+	}
+
+	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(!(UTRSTAT0 & 0x02)) {
+	}
+
+	return 0;
+}
+
+
+void serial_setbrg (void)
+{
+	u32 divisor = 0;
+
+	/* get correct divisor */
+	switch(gd->baudrate) {
+
+	case 1200:
+#if CONFIG_S3C44B0_CLOCK_SPEED==66
+		divisor = 3124;
+#elif CONFIG_S3C44B0_CLOCK_SPEED==75
+		divisor = 3905;
+#else
+# error CONFIG_S3C44B0_CLOCK_SPEED undefined
+#endif
+		break;
+
+	case 9600:
+#if CONFIG_S3C44B0_CLOCK_SPEED==66
+		divisor = 390;
+#elif CONFIG_S3C44B0_CLOCK_SPEED==75
+		divisor = 487;
+#else
+# error CONFIG_S3C44B0_CLOCK_SPEED undefined
+#endif
+		break;
+
+	case 19200:
+#if CONFIG_S3C44B0_CLOCK_SPEED==66
+		divisor = 194;
+#elif CONFIG_S3C44B0_CLOCK_SPEED==75
+		divisor = 243;
+#else
+# error CONFIG_S3C44B0_CLOCK_SPEED undefined
+#endif
+		break;
+
+	case 38400:
+#if CONFIG_S3C44B0_CLOCK_SPEED==66
+		divisor = 97;
+#elif CONFIG_S3C44B0_CLOCK_SPEED==75
+		divisor = 121;
+#else
+# error CONFIG_S3C44B0_CLOCK_SPEED undefined
+#endif	/* break; */
+
+	case 57600:
+#if CONFIG_S3C44B0_CLOCK_SPEED==66
+		divisor = 64;
+#elif CONFIG_S3C44B0_CLOCK_SPEED==75
+		divisor = 80;
+#else
+# error CONFIG_S3C44B0_CLOCK_SPEED undefined
+#endif	/* break; */
+
+	case 115200:
+#if CONFIG_S3C44B0_CLOCK_SPEED==66
+		divisor = 32;
+#elif CONFIG_S3C44B0_CLOCK_SPEED==75
+		divisor = 40;
+#else
+# error CONFIG_S3C44B0_CLOCK_SPEED undefined
+#endif	/* break; */
+	}
+
+	serial_flush_output();
+	serial_flush_input();
+	UFCON0 = 0x0;
+	ULCON0 = 0x03;
+	UCON0 = 0x05;
+	UBRDIV0 = divisor;
+
+	UFCON1 = 0x0;
+	ULCON1 = 0x03;
+	UCON1 = 0x05;
+	UBRDIV1 = divisor;
+
+	for(divisor=0; divisor<100; divisor++) {
+		/* NOP */
+	}
+}
+
+
+/*
+ * 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)
+{
+	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(!(UTRSTAT0 & 0x02));
+
+	UTXH0 = (unsigned char)c;
+
+	/*
+		to be polite with serial console add a line feed
+		to the carriage return character
+	*/
+	if (c=='\n')
+		serial_putc('\r');
+}
+
+/*
+ * 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_tstc (void)
+{
+	return (UTRSTAT0 & 0x01);
+}
+
+/*
+ * 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 > 0)
+			return URXH0;
+	}
+}
+
+void
+serial_puts (const char *s)
+{
+	while (*s) {
+		serial_putc (*s++);
+	}
+}