@@ -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));