omap3evm: Add board revision function

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@ti.com>
Signed-off-by: Ajay Kumar Gupta <ajay.gupta@ti.com>
Signed-off-by: Sanjeev Premi <premi@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

2 files changed, 53 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/board-omap3evm.c b/arch/arm/mach-omap2/board-omap3evm.c
index 1edf06adbe3c..149d45ca89a7 100644
--- a/arch/arm/mach-omap2/board-omap3evm.c
+++ b/arch/arm/mach-omap2/board-omap3evm.c
@@ -46,9 +46,42 @@
 
 #define OMAP3EVM_ETHR_START     0x2c000000
 #define OMAP3EVM_ETHR_SIZE      1024
+#define OMAP3EVM_ETHR_ID_REV    0x50
 #define OMAP3EVM_ETHR_GPIO_IRQ  176
 #define OMAP3EVM_SMC911X_CS     5
 
+static u8 omap3_evm_version;
+
+u8 get_omap3_evm_rev(void)
+{
+        return omap3_evm_version;
+}
+EXPORT_SYMBOL(get_omap3_evm_rev);
+
+static void __init omap3_evm_get_revision(void)
+{
+        void __iomem *ioaddr;
+        unsigned int smsc_id;
+
+        /* Ethernet PHY ID is stored at ID_REV register */
+        ioaddr = ioremap_nocache(OMAP3EVM_ETHR_START, SZ_1K);
+        if (!ioaddr)
+                return;
+        smsc_id = readl(ioaddr + OMAP3EVM_ETHR_ID_REV) & 0xFFFF0000;
+        iounmap(ioaddr);
+
+        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;
+        }
+}
+
 static struct resource omap3evm_smc911x_resources[] = {
         [0] =   {
                 .start  = OMAP3EVM_ETHR_START,
@@ -321,6 +354,8 @@ static struct ehci_hcd_omap_platform_data ehci_pdata __initconst = {
 
 static void __init omap3_evm_init(void)
 {
+        omap3_evm_get_revision();
+
         omap3_evm_i2c_init();
 
         platform_add_devices(omap3_evm_devices, ARRAY_SIZE(omap3_evm_devices));
diff --git a/arch/arm/plat-omap/include/plat/board.h b/arch/arm/plat-omap/include/plat/board.h
index c4fc69f09796..abb17b604f82 100644
--- a/arch/arm/plat-omap/include/plat/board.h
+++ b/arch/arm/plat-omap/include/plat/board.h
@@ -14,6 +14,18 @@
 
 #include <plat/gpio-switch.h>
 
+/*
+ * 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 */
+};
+
 /* Different peripheral ids */
 #define OMAP_TAG_CLOCK          0x4f01
 #define OMAP_TAG_LCD            0x4f05
@@ -157,4 +169,10 @@ extern int omap_board_config_size;
 /* for TI reference platforms sharing the same debug card */
 extern int debug_card_init(u32 addr, unsigned gpio);
 
+/* OMAP3EVM revision */
+#if defined(CONFIG_MACH_OMAP3EVM)
+u8 get_omap3_evm_rev(void);
+#else
+#define get_omap3_evm_rev() (-EINVAL)
+#endif
 #endif