* Code cleanup

* Patch by Sascha Hauer, 28 Jun:
  - add generic support for Motorola i.MX architecture
  - add support for mx1ads, mx1fs2 and scb9328 boards

* Patches by Marc Leeman, 23 Jul 2004:
  - Add define for the PCI/Memory Buffer Configuration Register
  - corrected comments in cpu/mpc824x/cpu_init.c

* Add support for multiple serial interfaces
  (for example to allow modem dial-in / dial-out)

1 files changed, 182 insertions, 0 deletions

diff --git a/cpu/arm920t/s3c24x0_serial.c b/cpu/arm920t/s3c24x0_serial.c
new file mode 100644
index 0000000..8327443
--- /dev/null
+++ b/cpu/arm920t/s3c24x0_serial.c
@@ -0,0 +1,182 @@
+/*
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <gj@denx.de>
+ *
+ * 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>
+#if defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB)
+
+#if defined(CONFIG_S3C2400) || defined(CONFIG_TRAB)
+#include <s3c2400.h>
+#elif defined(CONFIG_S3C2410)
+#include <s3c2410.h>
+#endif
+
+#ifdef CONFIG_SERIAL1
+#define UART_NR	S3C24X0_UART0
+
+#elif defined(CONFIG_SERIAL2)
+# if defined(CONFIG_TRAB)
+#  error "TRAB supports only CONFIG_SERIAL1"
+# endif
+#define UART_NR	S3C24X0_UART1
+
+#elif defined(CONFIG_SERIAL3)
+# if defined(CONFIG_TRAB)
+#  #error "TRAB supports only CONFIG_SERIAL1"
+# endif
+#define UART_NR	S3C24X0_UART2
+
+#else
+#error "Bad: you didn't configure serial ..."
+#endif
+
+void serial_setbrg (void)
+{
+	DECLARE_GLOBAL_DATA_PTR;
+	S3C24X0_UART * const uart = S3C24X0_GetBase_UART(UART_NR);
+	int i;
+	unsigned int reg = 0;
+
+	/* value is calculated so : (int)(PCLK/16./baudrate) -1 */
+	reg = get_PCLK() / (16 * gd->baudrate) - 1;
+
+	/* FIFO enable, Tx/Rx FIFO clear */
+	uart->UFCON = 0x07;
+	uart->UMCON = 0x0;
+	/* Normal,No parity,1 stop,8 bit */
+	uart->ULCON = 0x3;
+	/*
+	 * tx=level,rx=edge,disable timeout int.,enable rx error int.,
+	 * normal,interrupt or polling
+	 */
+	uart->UCON = 0x245;
+	uart->UBRDIV = reg;
+
+#ifdef CONFIG_HWFLOW
+	uart->UMCON = 0x1; /* RTS up */
+#endif
+	for (i = 0; i < 100; i++);
+}
+
+/*
+ * 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);
+}
+
+/*
+ * 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)
+{
+	S3C24X0_UART * const uart = S3C24X0_GetBase_UART(UART_NR);
+
+	/* wait for character to arrive */
+	while (!(uart->UTRSTAT & 0x1));
+
+	return uart->URXH & 0xff;
+}
+
+#ifdef CONFIG_HWFLOW
+static int hwflow = 0; /* turned off by default */
+int hwflow_onoff(int on)
+{
+	switch(on) {
+	case 0:
+	default:
+		break; /* return current */
+	case 1:
+		hwflow = 1; /* turn on */
+		break;
+	case -1:
+		hwflow = 0; /* turn off */
+		break;
+	}
+	return hwflow;
+}
+#endif
+
+#ifdef CONFIG_MODEM_SUPPORT
+static int be_quiet = 0;
+void disable_putc(void)
+{
+	be_quiet = 1;
+}
+
+void enable_putc(void)
+{
+	be_quiet = 0;
+}
+#endif
+
+
+/*
+ * Output a single byte to the serial port.
+ */
+void serial_putc (const char c)
+{
+	S3C24X0_UART * const uart = S3C24X0_GetBase_UART(UART_NR);
+#ifdef CONFIG_MODEM_SUPPORT
+	if (be_quiet)
+		return;
+#endif
+
+	/* wait for room in the tx FIFO */
+	while (!(uart->UTRSTAT & 0x2));
+
+#ifdef CONFIG_HWFLOW
+	/* Wait for CTS up */
+	while(hwflow && !(uart->UMSTAT & 0x1))
+		;
+#endif
+
+	uart->UTXH = c;
+
+	/* If \n, also do \r */
+	if (c == '\n')
+		serial_putc ('\r');
+}
+
+/*
+ * Test whether a character is in the RX buffer
+ */
+int serial_tstc (void)
+{
+	S3C24X0_UART * const uart = S3C24X0_GetBase_UART(UART_NR);
+
+	return uart->UTRSTAT & 0x1;
+}
+
+void
+serial_puts (const char *s)
+{
+	while (*s) {
+		serial_putc (*s++);
+	}
+}
+
+#endif /* defined(CONFIG_S3C2400) || defined (CONFIG_S3C2410) || defined (CONFIG_TRAB) */