[U-Boot] [PATCH 2/3] omap3evm: Add board revision function

[Ajay Kumar Gupta]

Added function to differentiate between the OMAP3EVM revisions. The
chip-id of the ethernet PHY is being used for this purpose.

Rev A to D : 0x01150000
Rev >= E   : 0x92200000

Signed-off-by: Vaibhav Hiremath <hvaibhav at ti.com>
Signed-off-by: Sanjeev Premi <premi at ti.com>
Signed-off-by: Ajay Kumar Gupta <ajay.gupta at ti.com>
Signed-off-by: Ajay Kumar Gupta <ajay.gupta at ti.com>
---
 board/ti/evm/evm.c |   30 ++++++++++++++++++++++++++++++
 board/ti/evm/evm.h |   14 ++++++++++++++
 2 files changed, 44 insertions(+), 0 deletions(-)

diff --git a/board/ti/evm/evm.c b/board/ti/evm/evm.c
index 0718a08..fcc1803 100644
--- a/board/ti/evm/evm.c
+++ b/board/ti/evm/evm.c
@@ -37,6 +37,33 @@
 #include <asm/mach-types.h>
 #include "evm.h"
 
+static u8 omap3_evm_version;
+
+u8 get_omap3_evm_rev(void)
+{
+	return omap3_evm_version;
+}
+
+static void omap3_evm_get_revision(void)
+{
+	unsigned int smsc_id;
+
+	/* Ethernet PHY ID is stored at ID_REV register */
+	smsc_id = readl(CONFIG_SMC911X_BASE + 0x50) & 0xFFFF0000;
+	printf("Read back SMSC id 0x%x\n", smsc_id);
+
+	switch (smsc_id) {
+	/* SMSC9115 chipset */
+	case 0x01150000:
+		omap3_evm_version = OMAP3EVM_BOARD_GEN_1;
+		break;
+	/* SMSC 9220 chipset */
+	case 0x92200000:
+	default:
+		omap3_evm_version = OMAP3EVM_BOARD_GEN_2;
+       }
+}
+
 /*
  * Routine: board_init
  * Description: Early hardware init.
@@ -121,6 +148,9 @@ static void setup_net_chip(void)
 	writel(GPIO0, &gpio3_base->cleardataout);
 	udelay(1);
 	writel(GPIO0, &gpio3_base->setdataout);
+
+	/* determine omap3evm revision */
+	omap3_evm_get_revision();
 }
 
 int board_eth_init(bd_t *bis)
diff --git a/board/ti/evm/evm.h b/board/ti/evm/evm.h
index 37da29d..e2581f6 100644
--- a/board/ti/evm/evm.h
+++ b/board/ti/evm/evm.h
@@ -33,6 +33,20 @@ const omap3_sysinfo sysinfo = {
 #endif
 };
 
+/*
+ * OMAP35x EVM revision
+ * Run time detection of EVM revision is done by reading Ethernet
+ * PHY ID -
+ *      GEN_1   = 0x01150000
+ *      GEN_2   = 0x92200000
+ */
+enum {
+	OMAP3EVM_BOARD_GEN_1 = 0,	/* EVM Rev between  A - D */
+	OMAP3EVM_BOARD_GEN_2,		/* EVM Rev >= Rev E */
+};
+
+u8 get_omap3_evm_rev(void);
+
 static void setup_net_chip(void);
 
 /*
-- 
1.6.2.4