spl: common: Support for USB MSD FAT image loading

Add SPL support to be able to detect a USB Mass Storage device
connected to a USB host.  Once a USB Mass storage device is detected
the SPL will load the u-boot.img from a FAT partition to target address.

Signed-off-by: Dan Murphy <dmurphy@ti.com>

arch/arm/include/asm/arch-am33xx/spl.h

@@ -19,6 +19,7 @@
 #define BOOT_DEVICE_MMC1	7
 #define BOOT_DEVICE_MMC2	8
 #define BOOT_DEVICE_SPI		10
+#define BOOT_DEVICE_USB     13
 #define BOOT_DEVICE_UART	65
 #define BOOT_DEVICE_CPGMAC	71
 #else
@@ -38,9 +39,16 @@
 #endif
 #define BOOT_DEVICE_MMC2_2      0xFF
 
-#if defined(CONFIG_AM33XX) || defined(CONFIG_AM43XX)
-#define MMC_BOOT_DEVICES_START	BOOT_DEVICE_MMC1
-#define MMC_BOOT_DEVICES_END	BOOT_DEVICE_MMC2
+#if defined(CONFIG_AM33XX)
+#define MMC_BOOT_DEVICES_START BOOT_DEVICE_MMC1
+#define MMC_BOOT_DEVICES_END   BOOT_DEVICE_MMC2
+#elif defined(CONFIG_AM43XX)
+#define MMC_BOOT_DEVICES_START BOOT_DEVICE_MMC1
+#ifdef CONFIG_SPL_USB_SUPPORT
+#define MMC_BOOT_DEVICES_END   BOOT_DEVICE_USB
+#else
+#define MMC_BOOT_DEVICES_END   BOOT_DEVICE_MMC2
+#endif
 #elif defined(CONFIG_TI81XX)
 #define MMC_BOOT_DEVICES_START	BOOT_DEVICE_MMC2
 #define MMC_BOOT_DEVICES_END	BOOT_DEVICE_MMC1

common/Makefile

@@ -197,6 +197,10 @@ obj-$(CONFIG_SPL_NET_SUPPORT) += miiphyutil.o
 obj-$(CONFIG_SPL_ENV_SUPPORT) += env_attr.o
 obj-$(CONFIG_SPL_ENV_SUPPORT) += env_flags.o
 obj-$(CONFIG_SPL_ENV_SUPPORT) += env_callback.o
+ifdef CONFIG_SPL_USB_HOST_SUPPORT
+obj-$(CONFIG_SPL_USB_SUPPORT) += usb.o usb_hub.o
+obj-$(CONFIG_USB_STORAGE) += usb_storage.o
+endif
 ifneq ($(CONFIG_SPL_NET_SUPPORT),y)
 obj-$(CONFIG_ENV_IS_NOWHERE) += env_nowhere.o
 obj-$(CONFIG_ENV_IS_IN_MMC) += env_mmc.o

common/spl/Makefile

@@ -16,5 +16,6 @@ obj-$(CONFIG_SPL_NAND_SUPPORT) += spl_nand.o
 obj-$(CONFIG_SPL_ONENAND_SUPPORT) += spl_onenand.o
 obj-$(CONFIG_SPL_NET_SUPPORT) += spl_net.o
 obj-$(CONFIG_SPL_MMC_SUPPORT) += spl_mmc.o
+obj-$(CONFIG_SPL_USB_SUPPORT) += spl_usb.o
 obj-$(CONFIG_SPL_FAT_SUPPORT) += spl_fat.o
 endif

common/spl/spl.c

@@ -204,6 +204,11 @@ void board_init_r(gd_t *dummy1, ulong dummy2)
 	case BOOT_DEVICE_USBETH:
 		spl_net_load_image("usb_ether");
 		break;
+#endif
+#ifdef CONFIG_SPL_USB_SUPPORT
+	case BOOT_DEVICE_USB:
+		spl_usb_load_image();
+		break;
 #endif
 	default:
 		debug("SPL: Un-supported Boot Device\n");

common/spl/spl_fat.c

@@ -28,7 +28,7 @@ static int spl_register_fat_device(block_dev_desc_t *block_dev, int partition)
 	err = fat_register_device(block_dev, partition);
 	if (err) {
 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
-		printf("spl: fat register err - %d\n", err);
+		printf("%s: fat register err - %d\n", __func__, err);
 #endif
 		hang();
 	}
@@ -46,7 +46,7 @@ int spl_load_image_fat(block_dev_desc_t *block_dev,
 	struct image_header *header;
 
 	err = spl_register_fat_device(block_dev, partition);
-	if (err <= 0)
+	if (err)
 		goto end;
 
 	header = (struct image_header *)(CONFIG_SYS_TEXT_BASE -
@@ -63,8 +63,8 @@ int spl_load_image_fat(block_dev_desc_t *block_dev,
 end:
 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
 	if (err <= 0)
-		printf("spl: error reading image %s, err - %d\n",
-		       filename, err);
+		printf("%s: error reading image %s, err - %d\n",
+		       __func__, filename, err);
 #endif
 
 	return (err <= 0);
@@ -76,15 +76,15 @@ int spl_load_image_fat_os(block_dev_desc_t *block_dev, int partition)
 	int err;
 
 	err = spl_register_fat_device(block_dev, partition);
-	if (err <= 0)
-		return -1;
+	if (err)
+		return err;
 
 	err = file_fat_read(CONFIG_SPL_FAT_LOAD_ARGS_NAME,
 			    (void *)CONFIG_SYS_SPL_ARGS_ADDR, 0);
 	if (err <= 0) {
 #ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
-		printf("spl: error reading image %s, err - %d\n",
-		       CONFIG_SPL_FAT_LOAD_ARGS_NAME, err);
+		printf("%s: error reading image %s, err - %d\n",
+		       __func__, CONFIG_SPL_FAT_LOAD_ARGS_NAME, err);
 #endif
 		return -1;
 	}

common/spl/spl_usb.c

@@ -0,0 +1,58 @@
+/*
+ * (C) Copyright 2014
+ * Texas Instruments, <www.ti.com>
+ *
+ * Dan Murphy <dmurphy@ti.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ *
+ * Derived work from spl_mmc.c
+ */
+
+#include <common.h>
+#include <spl.h>
+#include <asm/u-boot.h>
+#include <usb.h>
+#include <fat.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#ifdef CONFIG_USB_STORAGE
+static int usb_stor_curr_dev = -1; /* current device */
+#endif
+
+void spl_usb_load_image(void)
+{
+	int err;
+	block_dev_desc_t *stor_dev;
+
+	usb_stop();
+	err = usb_init();
+	if (err) {
+#ifdef CONFIG_SPL_LIBCOMMON_SUPPORT
+		printf("%s: usb init failed: err - %d\n", __func__, err);
+#endif
+		hang();
+	}
+
+#ifdef CONFIG_USB_STORAGE
+	/* try to recognize storage devices immediately */
+	usb_stor_curr_dev = usb_stor_scan(1);
+	stor_dev = usb_stor_get_dev(usb_stor_curr_dev);
+#endif
+
+	debug("boot mode - FAT\n");
+
+#ifdef CONFIG_SPL_OS_BOOT
+		if (spl_start_uboot() || spl_load_image_fat_os(stor_dev,
+								CONFIG_SYS_USB_FAT_BOOT_PARTITION))
+#endif
+		err = spl_load_image_fat(stor_dev,
+				CONFIG_SYS_USB_FAT_BOOT_PARTITION,
+				CONFIG_SPL_FAT_LOAD_PAYLOAD_NAME);
+
+		if (err) {
+			puts("Error loading USB device\n");
+			hang();
+		}
+}

include/spl.h

@@ -61,6 +61,9 @@ void spl_spi_load_image(void);
 /* Ethernet SPL functions */
 void spl_net_load_image(const char *device);
 
+/* USB SPL functions */
+void spl_usb_load_image(void);
+
 /* SPL FAT image functions */
 int spl_load_image_fat(block_dev_desc_t *block_dev, int partition, const char *filename);
 int spl_load_image_fat_os(block_dev_desc_t *block_dev, int partition);

spl/Makefile

@@ -83,6 +83,8 @@ LIBS-$(CONFIG_SPL_USBETH_SUPPORT) += drivers/net/phy/
 LIBS-$(CONFIG_SPL_MUSB_NEW_SUPPORT) += drivers/usb/musb-new/
 LIBS-$(CONFIG_SPL_USBETH_SUPPORT) += drivers/usb/gadget/
 LIBS-$(CONFIG_SPL_WATCHDOG_SUPPORT) += drivers/watchdog/
+LIBS-$(CONFIG_SPL_USB_HOST_SUPPORT) += drivers/usb/host/
+LIBS-$(CONFIG_OMAP_USB_PHY) += drivers/usb/phy/
 
 ifneq (,$(CONFIG_MX23)$(CONFIG_MX35)$(filter $(SOC), mx25 mx27 mx5 mx6 mx31 mx35))
 LIBS-y += arch/$(ARCH)/imx-common/