lh7a40x: move serial driver to drivers/serial

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

1 files changed, 184 insertions, 0 deletions

diff --git a/drivers/serial/serial_lh7a40x.c b/drivers/serial/serial_lh7a40x.c
new file mode 100644
index 0000000..4767489
--- /dev/null
+++ b/drivers/serial/serial_lh7a40x.c
@@ -0,0 +1,184 @@
+/*
+ * (C) Copyright 2002
+ * Gary Jennejohn, DENX Software Engineering, <garyj@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>
+#include <lh7a40x.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#if defined(CONFIG_CONSOLE_UART1)
+# define UART_CONSOLE 1
+#elif defined(CONFIG_CONSOLE_UART2)
+# define UART_CONSOLE 2
+#elif defined(CONFIG_CONSOLE_UART3)
+# define UART_CONSOLE 3
+#else
+# error "No console configured ... "
+#endif
+
+void serial_setbrg (void)
+{
+	lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
+	int i;
+	unsigned int reg = 0;
+
+	/*
+	 * userguide 15.1.2.4
+	 *
+	 * BAUDDIV is (UART_REF_FREQ/(16 X BAUD))-1
+	 *
+	 *   UART_REF_FREQ = external system clock input / 2 (Hz)
+	 *   BAUD is desired baudrate (bits/s)
+	 *
+	 *   NOTE: we add (divisor/2) to numerator to round for
+	 *         more precision
+	 */
+	reg = (((get_PLLCLK()/2) + ((16*gd->baudrate)/2)) / (16 * gd->baudrate)) - 1;
+	uart->brcon = reg;
+
+	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)
+{
+	lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
+
+	/* UART must be enabled before writing to any config registers */
+	uart->con |= (UART_EN);
+
+#ifdef CONFIG_CONSOLE_UART1
+	/* infrared disabled */
+	uart->con |= UART_SIRD;
+#endif
+	/* loopback disabled */
+	uart->con &= ~(UART_LBE);
+
+	/* modem lines and tx/rx polarities */
+	uart->con &= ~(UART_MXP | UART_TXP | UART_RXP);
+
+	/* FIFO enable, N81 */
+	uart->fcon = (UART_WLEN_8 | UART_FEN | UART_STP2_1);
+
+	/* set baudrate */
+	serial_setbrg ();
+
+	/* enable rx interrupt */
+	uart->inten |= UART_RI;
+
+	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)
+{
+	lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
+
+	/* wait for character to arrive */
+	while (uart->status & UART_RXFE);
+
+	return(uart->data & 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)
+{
+	lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
+
+#ifdef CONFIG_MODEM_SUPPORT
+	if (be_quiet)
+		return;
+#endif
+
+	/* wait for room in the tx FIFO */
+	while (!(uart->status & UART_TXFE));
+
+#ifdef CONFIG_HWFLOW
+	/* Wait for CTS up */
+	while(hwflow && !(uart->status & UART_CTS));
+#endif
+
+	uart->data = 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)
+{
+	lh7a40x_uart_t* uart = LH7A40X_UART_PTR(UART_CONSOLE);
+
+	return(!(uart->status & UART_RXFE));
+}
+
+void
+serial_puts (const char *s)
+{
+	while (*s) {
+		serial_putc (*s++);
+	}
+}