ZOOM2 Add serial support.

Zoom2 serial is in general supplied by one of the 4 UARTS on the debug board.
The default serial is from the USB connector on left side of the debug board.
The USB connector will produce 2 of the 4 UARTS.  On your host pick the first
enumeration.

The details of the setting of the serial gpmc setup are not available.
The values were provided by another party.

The serial port set up is the same with Zoom1.
Baud rate 115200, 8 bit data, no parity, 1 stop bit, no flow.

The kernel bootargs are
console=ttyS3,115200n8

Signed-off-by: Tom Rix <Tom.Rix@windriver.com>

1 files changed, 130 insertions, 0 deletions

diff --git a/board/omap3/zoom2/zoom2_serial.c b/board/omap3/zoom2/zoom2_serial.c
new file mode 100644
index 00000000000..a3d777dfadd
--- /dev/null
+++ b/board/omap3/zoom2/zoom2_serial.c
@@ -0,0 +1,130 @@
+/*
+ * Copyright (c) 2009 Wind River Systems, Inc.
+ * Tom Rix <Tom.Rix@windriver.com>
+ *
+ * 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
+ *
+ * This file was adapted from cpu/mpc5xxx/serial.c
+ *
+ */
+
+#include <common.h>
+#include <serial.h>
+#include <ns16550.h>
+#include <asm/arch/cpu.h>
+#include "zoom2_serial.h"
+
+int quad_init_dev (unsigned long base)
+{
+	/*
+	 * The Quad UART is on the debug board.
+	 * Check if the debug board is attached before using the UART
+	 */
+	if (zoom2_debug_board_connected ()) {
+		NS16550_t com_port = (NS16550_t) base;
+		int baud_divisor = CONFIG_SYS_NS16550_CLK / 16 /
+			CONFIG_BAUDRATE;
+
+		/*
+		 * Zoom2 has a board specific initialization of its UART.
+		 * This generic initialization has been copied from
+		 * drivers/serial/ns16550.c. The macros have been expanded.
+		 *
+		 * Do the following instead of
+		 *
+		 * NS16550_init (com_port, clock_divisor);
+		 */
+		com_port->ier = 0x00;
+
+		/*
+		 * On Zoom2 board Set pre-scalar to 1
+		 * CLKSEL is GND => MCR[7] is 1 => preslr is 4
+		 * So change the prescl to 1
+		 */
+		com_port->lcr = 0xBF;
+		com_port->fcr |= 0x10;
+		com_port->mcr &= 0x7F;
+
+		/* This is generic ns16550.c setup */
+		com_port->lcr = UART_LCR_BKSE | UART_LCR_8N1;
+		com_port->dll = 0;
+		com_port->dlm = 0;
+		com_port->lcr = UART_LCR_8N1;
+		com_port->mcr = UART_MCR_DTR | UART_MCR_RTS;
+		com_port->fcr = UART_FCR_FIFO_EN | UART_FCR_RXSR |
+			UART_FCR_TXSR;
+		com_port->lcr = UART_LCR_BKSE | UART_LCR_8N1;
+		com_port->dll = baud_divisor & 0xff;
+		com_port->dlm = (baud_divisor >> 8) & 0xff;
+		com_port->lcr = UART_LCR_8N1;
+	}
+	/*
+	 * We have to lie here, otherwise the board init code will hang
+	 * on the check
+	 */
+	return 0;
+}
+
+void quad_putc_dev (unsigned long base, const char c)
+{
+	if (zoom2_debug_board_connected ()) {
+
+		if (c == '\n')
+			quad_putc_dev (base, '\r');
+
+		NS16550_putc ((NS16550_t) base, c);
+	}
+}
+
+void quad_puts_dev (unsigned long base, const char *s)
+{
+	if (zoom2_debug_board_connected ()) {
+		while ((s != NULL) && (*s != '\0'))
+			quad_putc_dev (base, *s++);
+	}
+}
+
+int quad_getc_dev (unsigned long base)
+{
+	if (zoom2_debug_board_connected ())
+		return NS16550_getc ((NS16550_t) base);
+	else
+		return 0;
+}
+
+int quad_tstc_dev (unsigned long base)
+{
+	if (zoom2_debug_board_connected ())
+		return NS16550_tstc ((NS16550_t) base);
+	else
+		return 0;
+}
+
+void quad_setbrg_dev (unsigned long base)
+{
+	if (zoom2_debug_board_connected ()) {
+
+		int clock_divisor = CONFIG_SYS_NS16550_CLK / 16 /
+			CONFIG_BAUDRATE;
+
+		NS16550_reinit ((NS16550_t) base, clock_divisor);
+	}
+}
+
+QUAD_INIT (0)
+QUAD_INIT (1)
+QUAD_INIT (2)
+QUAD_INIT (3)