1 files changed, 99 insertions, 2 deletions

diff --git a/arch/arm/mach-omap2/board-omap3beagle.c b/arch/arm/mach-omap2/board-omap3beagle.c
index 51493f59325..7e704887864 100644
--- a/arch/arm/mach-omap2/board-omap3beagle.c
+++ b/arch/arm/mach-omap2/board-omap3beagle.c
@@ -51,6 +51,93 @@
 
 #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 */
         {
@@ -186,7 +273,10 @@ static struct gpio_led gpio_leds[];
 static int beagle_twl_gpio_setup(struct device *dev,
                 unsigned gpio, unsigned ngpio)
 {
-        if (system_rev >= 0x20 && system_rev <= 0x34301000) {
+        if (omap3_beagle_get_rev() == OMAP3BEAGLE_BOARD_XM) {
+                mmc[0].gpio_wp = -EINVAL;
+        } else if ((omap3_beagle_get_rev() == OMAP3BEAGLE_BOARD_C1_3) ||
+                (omap3_beagle_get_rev() == OMAP3BEAGLE_BOARD_C4)) {
                 omap_mux_init_gpio(23, OMAP_PIN_INPUT);
                 mmc[0].gpio_wp = 23;
         } else {
@@ -323,13 +413,19 @@ static struct i2c_board_info __initdata beagle_i2c_boardinfo[] = {
         },
 };
 
+static struct i2c_board_info __initdata beagle_i2c_eeprom[] = {
+       {
+               I2C_BOARD_INFO("eeprom", 0x50),
+       },
+};
+
 static int __init omap3_beagle_i2c_init(void)
 {
         omap_register_i2c_bus(1, 2600, beagle_i2c_boardinfo,
                         ARRAY_SIZE(beagle_i2c_boardinfo));
         /* Bus 3 is attached to the DVI port where devices like the pico DLP
          * projector don't work reliably with 400kHz */
-        omap_register_i2c_bus(3, 100, NULL, 0);
+        omap_register_i2c_bus(3, 100, beagle_i2c_eeprom, ARRAY_SIZE(beagle_i2c_eeprom));
         return 0;
 }
 
@@ -465,6 +561,7 @@ 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));