[PATCH v3 1/3] ARM: OMAP: Beagle: revision detection

[Robert Nelson <robertcnelson@gmail.com>]

Due to the omap3530 ES3.0 Silicon being used on both the
B5/B6 and C1/2/3 Beagle we can't use the cpu_is_omap34xx() 
routines to differentiate the Beagle Boards.

However gpio pins 171,172,173 where setup for this prupose, so 
lets use them.

Changes since v2:
for older U-Boot's, use omap_mux_init_gpio() over gpio_direction_input()
keep Beagle Rev in board-omap3beagle.c

Tested on Beagle Revisions: B5, C2, C4, and xMA

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
---
 arch/arm/mach-omap2/board-omap3beagle.c |   78 +++++++++++++++++++++++++++++++
 1 files changed, 78 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-omap2/board-omap3beagle.c b/arch/arm/mach-omap2/board-omap3beagle.c
index 87969c7..e42a5ff 100644
--- a/arch/arm/mach-omap2/board-omap3beagle.c
+++ b/arch/arm/mach-omap2/board-omap3beagle.c
@@ -50,6 +50,83 @@
 
 #define NAND_BLOCK_SIZE		SZ_128K
 
+/*
+ * OMAP3 Beagle revision
+ * Run time detection of Beagle revision is done by reading GPIO.
+ * GPIO ID -
+ *	AXBX	= GPIO173, GPIO172, GPIO171: 1 1 1
+ *	C1_3	= GPIO173, GPIO172, GPIO171: 1 1 0
+ *	C4	= GPIO173, GPIO172, GPIO171: 1 0 1
+ *	XM	= GPIO173, GPIO172, GPIO171: 0 0 0
+ */
+enum {
+	OMAP3BEAGLE_BOARD_AXBX = 0,
+	OMAP3BEAGLE_BOARD_C1_3,
+	OMAP3BEAGLE_BOARD_C4,
+	OMAP3BEAGLE_BOARD_XM,
+};
+
+static u8 omap3_beagle_version;
+
+u8 get_omap3_beagle_rev(void)
+{
+	return omap3_beagle_version;
+}
+
+static void __init omap3_beagle_get_revision(void)
+{
+	int ret;
+	u16 beagle_rev = 0;
+
+	ret = gpio_request(171, "rev_id_0");
+	if (ret < 0)
+		goto fail;
+
+	ret = gpio_request(172, "rev_id_1");
+	if (ret < 0)
+		goto fail;
+
+	ret = gpio_request(173, "rev_id_2");
+	if (ret < 0)
+		goto fail;
+
+	/* Older U-Boot's such as 2009.01-dirty don't have the pins 
+	 * muxed correctly to use the generic gpio_direction_input();
+	 */
+	omap_mux_init_gpio(171, OMAP_PIN_INPUT_PULLUP);
+	omap_mux_init_gpio(172, OMAP_PIN_INPUT_PULLUP);
+	omap_mux_init_gpio(173, OMAP_PIN_INPUT_PULLUP);
+
+	beagle_rev = gpio_get_value(171) | (gpio_get_value(172) << 1)
+			| (gpio_get_value(173) << 2);
+
+	switch (beagle_rev) {
+	case 7:
+		printk(KERN_INFO "OMAP3 Beagle Rev: Ax/Bx\n");
+		omap3_beagle_version = OMAP3BEAGLE_BOARD_AXBX;
+		break;
+	case 6:
+		printk(KERN_INFO "OMAP3 Beagle Rev: C1/C2/C3\n");
+		omap3_beagle_version = OMAP3BEAGLE_BOARD_C1_3;
+		break;
+	case 5:
+		printk(KERN_INFO "OMAP3 Beagle Rev: C4\n");
+		omap3_beagle_version = OMAP3BEAGLE_BOARD_C4;
+		break;
+	case 0:
+		printk(KERN_INFO "OMAP3 Beagle Rev: xM\n");
+		omap3_beagle_version = OMAP3BEAGLE_BOARD_XM;
+		break;
+	default:
+		printk(KERN_INFO "OMAP3 Beagle Rev: unknown %hd\n", beagle_rev);
+		omap3_beagle_version = OMAP3BEAGLE_BOARD_XM;
+	}
+
+	return;
+fail:
+	printk(KERN_ERR "Unable to get revision detection GPIO pins\n");
+}
+
 static struct mtd_partition omap3beagle_nand_partitions[] = {
 	/* All the partition sizes are listed in terms of NAND block size */
 	{
@@ -464,6 +541,7 @@ static struct omap_musb_board_data musb_board_data = {
 static void __init omap3_beagle_init(void)
 {
 	omap3_mux_init(board_mux, OMAP_PACKAGE_CBB);
+	omap3_beagle_get_revision();
 	omap3_beagle_i2c_init();
 	platform_add_devices(omap3_beagle_devices,
 			ARRAY_SIZE(omap3_beagle_devices));
-- 
1.7.0.4