[U-Boot] [PATCH 3/8] ZOOM2 Add support for debug board detection.

[Tom Rix <Tom.Rix@windriver.com>]

https://omapzoom.org/gf/project/omapzoom/wiki/?pagename=GettingStartedWithZoomII_AKA_OMAP34XII_MDP

The zoom2 has an auxillary board that contains the serial, net, jtag and
battery simulator.  This change supports a runtime check if the debug board is
connected.

Signed-off-by: Tom Rix <Tom.Rix@windriver.com>
---
 board/omap3/zoom2/Makefile      |    3 +-
 board/omap3/zoom2/debug_board.c |   57 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+), 1 deletions(-)
 create mode 100644 board/omap3/zoom2/debug_board.c

diff --git a/board/omap3/zoom2/Makefile b/board/omap3/zoom2/Makefile
index 088b8cb..b8fa5a7 100644
--- a/board/omap3/zoom2/Makefile
+++ b/board/omap3/zoom2/Makefile
@@ -25,7 +25,8 @@ include $(TOPDIR)/config.mk
 
 LIB	= $(obj)lib$(BOARD).a
 
-COBJS	:= zoom2.o
+COBJS	:= zoom2.o \
+	debug_board.o
 
 SRCS	:= $(COBJS:.o=.c)
 OBJS	:= $(addprefix $(obj),$(COBJS))
diff --git a/board/omap3/zoom2/debug_board.c b/board/omap3/zoom2/debug_board.c
new file mode 100644
index 0000000..782dcb2
--- /dev/null
+++ b/board/omap3/zoom2/debug_board.c
@@ -0,0 +1,57 @@
+/*
+ * (C) Copyright 2009
+ * Wind River, <www.windriver.com>
+ * 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
+ *
+ */
+#include <common.h>
+#include <asm/arch/cpu.h>
+#include <asm/io.h>
+#include <asm/arch/mux.h>
+
+#define DEBUG_BOARD_CONNECTED     1
+#define DEBUG_BOARD_NOT_CONNECTED 0
+
+static int debug_board_connected = DEBUG_BOARD_CONNECTED;
+
+static void zoom2_debug_board_detect (void)
+{
+	unsigned int val;
+	/*
+	 * GPIO to query for debug board
+	 * 158 db board query, bank 5, index 30
+	 */
+	gpio_t *gpio5_base = (gpio_t *) OMAP34XX_GPIO5_BASE;
+
+	val = __raw_readl (&gpio5_base->datain);
+
+	/* Check the bit for gpio 158 */
+	if (!(val & (1 << 30)))
+		debug_board_connected = DEBUG_BOARD_NOT_CONNECTED;
+}
+
+int zoom2_debug_board_connected (void)
+{
+	static int first_time = 1;
+
+	if (first_time) {
+		zoom2_debug_board_detect ();
+		first_time = 0;
+	}
+	return debug_board_connected;
+}
-- 
1.6.0.5