ARMV7: OMAP: Add detection and support for Beagle C4 revision

This patch enhances the revision detection function and adds
support for the C4 revision.  The board revision is printed
and approriate revision specific setup is done automatically.

Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>

1 files changed, 53 insertions, 37 deletions

diff --git a/board/ti/beagle/beagle.c b/board/ti/beagle/beagle.c
index 3b4c9e7..ec95ad0 100644
--- a/board/ti/beagle/beagle.c
+++ b/board/ti/beagle/beagle.c
@@ -38,8 +38,6 @@
 #include <asm/mach-types.h>
 #include "beagle.h"
 
-static int beagle_revision_c;
-
 /*
  * Routine: board_init
  * Description: Early hardware init.
@@ -58,43 +56,40 @@ int board_init(void)
 }
 
 /*
- * Routine: beagle_get_revision
- * Description: Return the revision of the BeagleBoard this code is running on.
- *              If it is a revision Ax/Bx board, this function returns 0,
- *              on a revision C board you will get a 1.
+ * Routine: get_board_revision
+ * Description: Detect if we are running on a Beagle revision Ax/Bx,
+ *		C1/2/3, or C4. This can be done by reading
+ *		the level of GPIO173, GPIO172 and GPIO171. This should
+ *		result in
+ *		GPIO173, GPIO172, GPIO171: 1 1 1 => Ax/Bx
+ *		GPIO173, GPIO172, GPIO171: 1 1 0 => C1/2/3
+ *		GPIO173, GPIO172, GPIO171: 1 0 1 => C4
  */
-int beagle_get_revision(void)
+int get_board_revision(void)
 {
-	return beagle_revision_c;
-}
+	int revision;
 
-/*
- * Routine: beagle_identify
- * Description: Detect if we are running on a Beagle revision Ax/Bx or
- *              Cx. This can be done by GPIO_171. If this is low, we are
- *              running on a revision C board.
- */
-void beagle_identify(void)
-{
-	beagle_revision_c = 0;
-	if (!omap_request_gpio(171)) {
-		unsigned int val;
+	if (!omap_request_gpio(171) &&
+	    !omap_request_gpio(172) &&
+	    !omap_request_gpio(173)) {
 
 		omap_set_gpio_direction(171, 1);
-		val = omap_get_gpio_datain(171);
-		omap_free_gpio(171);
+		omap_set_gpio_direction(172, 1);
+		omap_set_gpio_direction(173, 1);
 
-		if (val)
-			beagle_revision_c = 0;
-		else
-			beagle_revision_c = 1;
+		revision = omap_get_gpio_datain(173) << 2 |
+			   omap_get_gpio_datain(172) << 1 |
+			   omap_get_gpio_datain(171);
+
+		omap_free_gpio(171);
+		omap_free_gpio(172);
+		omap_free_gpio(173);
+	} else {
+		printf("Error: unable to acquire board revision GPIOs\n");
+		revision = -1;
 	}
 
-	printf("Board revision ");
-	if (beagle_revision_c)
-		printf("C\n");
-	else
-		printf("Ax/Bx\n");
+	return revision;
 }
 
 /*
@@ -106,6 +101,33 @@ int misc_init_r(void)
 	struct gpio *gpio5_base = (struct gpio *)OMAP34XX_GPIO5_BASE;
 	struct gpio *gpio6_base = (struct gpio *)OMAP34XX_GPIO6_BASE;
 
+	switch (get_board_revision()) {
+	case REVISION_AXBX:
+		printf("Beagle Rev Ax/Bx\n");
+		setenv("beaglerev", "AxBx");
+		setenv("mpurate", "600");
+		break;
+	case REVISION_CX:
+		printf("Beagle Rev C1/C2/C3\n");
+		setenv("beaglerev", "Cx");
+		setenv("mpurate", "600");
+		MUX_BEAGLE_C();
+		break;
+	case REVISION_C4:
+		printf("Beagle Rev C4\n");
+		setenv("beaglerev", "Cx");
+		setenv("mpurate", "720");
+		MUX_BEAGLE_C();
+		/* Set VAUX2 to 1.8V for EHCI PHY */
+		twl4030_pmrecv_vsel_cfg(TWL4030_PM_RECEIVER_VAUX2_DEDICATED,
+					TWL4030_PM_RECEIVER_VAUX2_VSEL_18,
+					TWL4030_PM_RECEIVER_VAUX2_DEV_GRP,
+					TWL4030_PM_RECEIVER_DEV_GRP_P1);
+		break;
+	default:
+		printf("Beagle unknown 0x%02x\n", get_board_revision());
+	}
+
 	twl4030_power_init();
 	twl4030_led_init(TWL4030_LED_LEDEN_LEDAON | TWL4030_LED_LEDEN_LEDBON);
 
@@ -120,8 +142,6 @@ int misc_init_r(void)
 	writel(GPIO31 | GPIO30 | GPIO29 | GPIO28 | GPIO22 | GPIO21 |
 		GPIO15 | GPIO14 | GPIO13 | GPIO12, &gpio5_base->setdataout);
 
-	beagle_identify();
-
 	dieid_num_r();
 
 	return 0;
@@ -136,8 +156,4 @@ int misc_init_r(void)
 void set_muxconf_regs(void)
 {
 	MUX_BEAGLE();
-
-	if (beagle_revision_c) {
-		MUX_BEAGLE_C();
-	}
 }