[U-Boot] [PATCH 06/7] ARMV7: OMAP: Add detection and support for Beagle C4 revision

[Steve Sakoman]

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 at sakoman.com>
---
 board/ti/beagle/beagle.c |   90 +++++++++++++++++++++++++++-------------------
 board/ti/beagle/beagle.h |    7 +++-
 2 files changed, 58 insertions(+), 39 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();
-	}
 }
diff --git a/board/ti/beagle/beagle.h b/board/ti/beagle/beagle.h
index 7fe6275..e5f380c 100644
--- a/board/ti/beagle/beagle.h
+++ b/board/ti/beagle/beagle.h
@@ -33,7 +33,10 @@ const omap3_sysinfo sysinfo = {
 #endif
 };
 
-#define BOARD_REVISION_MASK	(0x1 << 11)
+/* BeagleBoard revisions */
+#define REVISION_AXBX	0x7
+#define REVISION_CX	0x6
+#define REVISION_C4	0x5
 
 /*
  * IEN  - Input Enable
@@ -264,7 +267,7 @@ const omap3_sysinfo sysinfo = {
 	MUX_VAL(CP(HDQ_SIO),		(IDIS | PTU | EN  | M4)) /*GPIO_170*/\
 	MUX_VAL(CP(MCSPI1_CLK),		(IEN  | PTU | EN  | M4)) /*GPIO_171*/\
 	MUX_VAL(CP(MCSPI1_SIMO),	(IEN  | PTU | EN  | M4)) /*GPIO_172*/\
-	MUX_VAL(CP(MCSPI1_SOMI),	(IEN  | PTD | DIS | M0)) /*McSPI1_SOMI*/\
+	MUX_VAL(CP(MCSPI1_SOMI),	(IEN  | PTU | EN  | M4)) /*GPIO_173*/\
 	MUX_VAL(CP(MCSPI1_CS0),		(IEN  | PTD | EN  | M0)) /*McSPI1_CS0*/\
 	MUX_VAL(CP(MCSPI1_CS1),		(IDIS | PTD | EN  | M0)) /*McSPI1_CS1*/\
 	MUX_VAL(CP(MCSPI1_CS2),		(IDIS | PTD | DIS | M4)) /*GPIO_176*/\
-- 
1.7.0.4