[U-Boot] [PATCH 2/3] ZOOM2 detect the version of the zoom2 board at runtime.

[Tom Rix]

There are currently 3 versions of the zoom2 board.
The production board, that is currently being released.
The beta board, similar in form to the production board but not released.
The alpha board, a set of PCBs with a very limited circulation.

GPIO 94 is used to determine the version of the board. If GPIO 94 is clear,
the board is a production board, otherwise it is a beta board.

The alpha board will likely be mistaken for a beta board.  An alpha board
was unavailible for testing.

This has been tested on the beta and production boards.

Signed-off-by: Tom Rix <Tom.Rix at windriver.com>
---
 board/omap3/zoom2/zoom2.c |   62 ++++++++++++++++++++++++++++++++++++++++++--
 board/omap3/zoom2/zoom2.h |    9 ++++++
 2 files changed, 68 insertions(+), 3 deletions(-)

diff --git a/board/omap3/zoom2/zoom2.c b/board/omap3/zoom2/zoom2.c
index e5c248d..94231da 100644
--- a/board/omap3/zoom2/zoom2.c
+++ b/board/omap3/zoom2/zoom2.c
@@ -33,6 +33,7 @@
 #include <status_led.h>
 #endif
 #include <asm/io.h>
+#include <asm/arch/gpio.h>
 #include <asm/arch/mem.h>
 #include <asm/arch/mux.h>
 #include <asm/arch/sys_proto.h>
@@ -60,6 +61,60 @@ static u32 gpmc_serial_TL16CP754C[GPMC_MAX_REG] = {
 	0x1D0904C4, 0
 };
 
+/* Used to track the revision of the board */
+static ZOOM2_REVISION zoom2_revision = ZOOM2_REVISION_UNKNOWN;
+
+/*
+ * Routine: zoom2_get_revision
+ * Description: Return the revision of the Zoom2 this code is running on.
+ */
+ZOOM2_REVISION zoom2_get_revision(void)
+{
+	return zoom2_revision;
+}
+
+/*
+ * Routine: zoom2_identify
+ * Description: Detect which version of Zoom2 we are running on.
+ */
+void zoom2_identify(void)
+{
+	/*
+	 * To check for production board vs beta board,
+	 * check if gpio 94 is clear.
+	 *
+	 * No way yet to check for alpha board identity.
+	 * Alpha boards were produced in very limited quantities
+	 * and they are not commonly used.  They are mentioned here
+	 * only for completeness.
+	 */
+	if (!omap_request_gpio(94)) {
+		unsigned int val;
+
+		omap_set_gpio_direction(94, 1);
+		val = omap_get_gpio_datain(94);
+		omap_free_gpio(94);
+
+		if (val)
+			zoom2_revision = ZOOM2_REVISION_BETA;
+		else
+			zoom2_revision = ZOOM2_REVISION_PRODUCTION;
+	}
+
+	printf("Board revision ");
+	switch (zoom2_revision) {
+	case (ZOOM2_REVISION_PRODUCTION):
+		printf("Production\n");
+		break;
+	case (ZOOM2_REVISION_BETA):
+		printf("Beta\n");
+		break;
+	default:
+		printf("Unknown\n");
+		break;
+	}
+}
+
 /*
  * Routine: board_init
  * Description: Early hardware init.
@@ -96,10 +151,11 @@ int board_init (void)
  * Routine: misc_init_r
  * Description: Configure zoom board specific configurations
  */
-int misc_init_r (void)
+int misc_init_r(void)
 {
-	power_init_r ();
-	dieid_num_r ();
+	zoom2_identify();
+	power_init_r();
+	dieid_num_r();
 	return 0;
 }
 
diff --git a/board/omap3/zoom2/zoom2.h b/board/omap3/zoom2/zoom2.h
index cae8a7a..b12b0fa 100644
--- a/board/omap3/zoom2/zoom2.h
+++ b/board/omap3/zoom2/zoom2.h
@@ -32,6 +32,15 @@ const omap3_sysinfo sysinfo = {
 	"NAND",
 };
 
+typedef enum {
+	ZOOM2_REVISION_UNKNOWN = 0,
+	ZOOM2_REVISION_ALPHA,
+	ZOOM2_REVISION_BETA,
+	ZOOM2_REVISION_PRODUCTION
+} ZOOM2_REVISION;
+
+extern ZOOM2_REVISION zoom2_get_revision(void);
+
 /*
  * IEN	- Input Enable
  * IDIS	- Input Disable
-- 
1.6.0.5