omap: Beagle: revision detection

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:
for older U-Boot's, use omap_mux_init_gpio()
keep Beagle Rev in board-omap3beagle.c
gpio_free on gpio request failure

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

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
Acked-by: Jarkko Nikula <jhnikula@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

1 files changed, 88 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/board-omap3beagle.c b/arch/arm/mach-omap2/board-omap3beagle.c
index 87969c7df652..1aebb3f4f20a 100644
--- a/arch/arm/mach-omap2/board-omap3beagle.c
+++ b/arch/arm/mach-omap2/board-omap3beagle.c
@@ -50,6 +50,93 @@
 
 #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_UNKN = 0,
+        OMAP3BEAGLE_BOARD_AXBX,
+        OMAP3BEAGLE_BOARD_C1_3,
+        OMAP3BEAGLE_BOARD_C4,
+        OMAP3BEAGLE_BOARD_XM,
+};
+
+static u8 omap3_beagle_version;
+
+static u8 omap3_beagle_get_rev(void)
+{
+        return omap3_beagle_version;
+}
+
+static void __init omap3_beagle_init_rev(void)
+{
+        int ret;
+        u16 beagle_rev = 0;
+
+        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);
+
+        ret = gpio_request(171, "rev_id_0");
+        if (ret < 0)
+                goto fail0;
+
+        ret = gpio_request(172, "rev_id_1");
+        if (ret < 0)
+                goto fail1;
+
+        ret = gpio_request(173, "rev_id_2");
+        if (ret < 0)
+                goto fail2;
+
+        gpio_direction_input(171);
+        gpio_direction_input(172);
+        gpio_direction_input(173);
+
+        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_UNKN;
+        }
+
+        return;
+
+fail2:
+        gpio_free(172);
+fail1:
+        gpio_free(171);
+fail0:
+        printk(KERN_ERR "Unable to get revision detection GPIO pins\n");
+        omap3_beagle_version = OMAP3BEAGLE_BOARD_UNKN;
+
+        return;
+}
+
 static struct mtd_partition omap3beagle_nand_partitions[] = {
         /* All the partition sizes are listed in terms of NAND block size */
         {
@@ -464,6 +551,7 @@ 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_init_rev();
         omap3_beagle_i2c_init();
         platform_add_devices(omap3_beagle_devices,
                         ARRAY_SIZE(omap3_beagle_devices));