am335x_evm: enable support for booting via USB

This adds necessary config options and a new build target,
am335x_evm_usbspl, to enable usb booting and fixes board_eth_init()
function to take into account that we may have USB ether support in SPL
now.  This uses the same MAC for both cpsw and USB, in order to match
ROM behavior.

The usbspl build target does not contain UART SPL, CPSW SPL or extra
environment settings, so that we may fit within our binary size
constraint.

Signed-off-by: Ilya Yanok <ilya.yanok@cogentembedded.com>
Signed-off-by: Tom Rini <trini@ti.com>

board/ti/am335x/board.c

@@ -389,7 +389,8 @@ int board_late_init(void)
 }
 #endif
 
-#ifdef CONFIG_DRIVER_TI_CPSW
+#if (defined(CONFIG_DRIVER_TI_CPSW) && !defined(CONFIG_SPL_BUILD)) || \
+	(defined(CONFIG_SPL_ETH_SUPPORT) && defined(CONFIG_SPL_BUILD))
 static void cpsw_control(int enabled)
 {
 	/* VTP can be added here */
@@ -434,26 +435,26 @@ static struct cpsw_platform_data cpsw_data = {
 int board_eth_init(bd_t *bis)
 {
 	int rv, n = 0;
-#ifdef CONFIG_DRIVER_TI_CPSW
 	uint8_t mac_addr[6];
 	uint32_t mac_hi, mac_lo;
 
-	if (!eth_getenv_enetaddr("ethaddr", mac_addr)) {
-		printf("<ethaddr> not set. Reading from E-fuse\n");
-		/* try reading mac address from efuse */
-		mac_lo = readl(&cdev->macid0l);
-		mac_hi = readl(&cdev->macid0h);
-		mac_addr[0] = mac_hi & 0xFF;
-		mac_addr[1] = (mac_hi & 0xFF00) >> 8;
-		mac_addr[2] = (mac_hi & 0xFF0000) >> 16;
-		mac_addr[3] = (mac_hi & 0xFF000000) >> 24;
-		mac_addr[4] = mac_lo & 0xFF;
-		mac_addr[5] = (mac_lo & 0xFF00) >> 8;
+	/* try reading mac address from efuse */
+	mac_lo = readl(&cdev->macid0l);
+	mac_hi = readl(&cdev->macid0h);
+	mac_addr[0] = mac_hi & 0xFF;
+	mac_addr[1] = (mac_hi & 0xFF00) >> 8;
+	mac_addr[2] = (mac_hi & 0xFF0000) >> 16;
+	mac_addr[3] = (mac_hi & 0xFF000000) >> 24;
+	mac_addr[4] = mac_lo & 0xFF;
+	mac_addr[5] = (mac_lo & 0xFF00) >> 8;
+
+#if (defined(CONFIG_DRIVER_TI_CPSW) && !defined(CONFIG_SPL_BUILD)) || \
+	(defined(CONFIG_SPL_ETH_SUPPORT) && defined(CONFIG_SPL_BUILD))
+	if (!getenv("ethaddr")) {
+		printf("<ethaddr> not set. Validating first E-fuse MAC\n");
 
 		if (is_valid_ether_addr(mac_addr))
 			eth_setenv_enetaddr("ethaddr", mac_addr);
-		else
-			goto try_usbether;
 	}
 
 	if (board_is_bone() || board_is_bone_lt() || board_is_idk()) {
@@ -494,8 +495,11 @@ int board_eth_init(bd_t *bis)
 				AR8051_RGMII_TX_CLK_DLY);
 	}
 #endif
-try_usbether:
-#if defined(CONFIG_USB_ETHER) && !defined(CONFIG_SPL_BUILD)
+#if defined(CONFIG_USB_ETHER) && \
+	(!defined(CONFIG_SPL_BUILD) || defined(CONFIG_SPL_USBETH_SUPPORT))
+	if (is_valid_ether_addr(mac_addr))
+		eth_setenv_enetaddr("usbnet_devaddr", mac_addr);
+
 	rv = usb_eth_initialize(bis);
 	if (rv < 0)
 		printf("Error %d registering USB_ETHER\n", rv);

include/configs/am335x_evm.h

@@ -239,6 +239,7 @@
 #define CONFIG_SPL_SPI_CS		0
 #define CONFIG_SYS_SPI_U_BOOT_OFFS	0x20000
 #define CONFIG_SYS_SPI_U_BOOT_SIZE	0x40000
+#define CONFIG_SPL_MUSB_NEW_SUPPORT
 #define CONFIG_SPL_LDSCRIPT		"$(CPUDIR)/omap-common/u-boot-spl.lds"
 
 #define CONFIG_SPL_BOARD_INIT
@@ -312,8 +313,21 @@
 #ifdef CONFIG_MUSB_GADGET
 #define CONFIG_USB_ETHER
 #define CONFIG_USB_ETH_RNDIS
+#define CONFIG_USBNET_HOST_ADDR	"de:ad:be:af:00:00"
 #endif /* CONFIG_MUSB_GADGET */
 
+#if defined(CONFIG_SPL_BUILD) && defined(CONFIG_SPL_USBETH_SUPPORT)
+/* disable host part of MUSB in SPL */
+#undef CONFIG_MUSB_HOST
+/*
+ * Disable UART, CPSW ethernet support and extra environment settings so we
+ * will fit within 101KiB.
+ */
+#undef CONFIG_SPL_ETH_SUPPORT
+#undef CONFIG_SPL_YMODEM_SUPPORT
+#undef CONFIG_EXTRA_ENV_SETTINGS
+#endif
+
 /* Unsupported features */
 #undef CONFIG_USE_IRQ