7 files changed, 659 insertions, 80 deletions

diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 896c8d4..66becdc 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_THOR_FUNCTION) += f_thor.o
 obj-$(CONFIG_USBDOWNLOAD_GADGET) += g_dnl.o
 obj-$(CONFIG_DFU_FUNCTION) += f_dfu.o
 obj-$(CONFIG_USB_GADGET_MASS_STORAGE) += f_mass_storage.o
+obj-$(CONFIG_CMD_FASTBOOT) += f_fastboot.o
 endif
 ifdef CONFIG_USB_ETHER
 obj-y += ether.o
diff --git a/drivers/usb/gadget/ci_udc.c b/drivers/usb/gadget/ci_udc.c
index 02d3fda..9cd0036 100644
--- a/drivers/usb/gadget/ci_udc.c
+++ b/drivers/usb/gadget/ci_udc.c
@@ -205,13 +205,26 @@ static void ci_invalidate_qtd(int ep_num)
 static struct usb_request *
 ci_ep_alloc_request(struct usb_ep *ep, unsigned int gfp_flags)
 {
-	struct ci_ep *ci_ep = container_of(ep, struct ci_ep, ep);
-	return &ci_ep->req;
+	struct ci_req *ci_req;
+
+	ci_req = memalign(ARCH_DMA_MINALIGN, sizeof(*ci_req));
+	if (!ci_req)
+		return NULL;
+
+	INIT_LIST_HEAD(&ci_req->queue);
+	ci_req->b_buf = 0;
+
+	return &ci_req->req;
 }
 
-static void ci_ep_free_request(struct usb_ep *ep, struct usb_request *_req)
+static void ci_ep_free_request(struct usb_ep *ep, struct usb_request *req)
 {
-	return;
+	struct ci_req *ci_req;
+
+	ci_req = container_of(req, struct ci_req, req);
+	if (ci_req->b_buf)
+		free(ci_req->b_buf);
+	free(ci_req);
 }
 
 static void ep_enable(int num, int in, int maxpacket)
@@ -267,99 +280,102 @@ static int ci_ep_disable(struct usb_ep *ep)
 	return 0;
 }
 
-static int ci_bounce(struct ci_ep *ep, int in)
+static int ci_bounce(struct ci_req *ci_req, int in)
 {
-	uint32_t addr = (uint32_t)ep->req.buf;
-	uint32_t ba;
+	struct usb_request *req = &ci_req->req;
+	uint32_t addr = (uint32_t)req->buf;
+	uint32_t hwaddr;
+	uint32_t aligned_used_len;
 
 	/* Input buffer address is not aligned. */
 	if (addr & (ARCH_DMA_MINALIGN - 1))
 		goto align;
 
 	/* Input buffer length is not aligned. */
-	if (ep->req.length & (ARCH_DMA_MINALIGN - 1))
+	if (req->length & (ARCH_DMA_MINALIGN - 1))
 		goto align;
 
 	/* The buffer is well aligned, only flush cache. */
-	ep->b_len = ep->req.length;
-	ep->b_buf = ep->req.buf;
+	ci_req->hw_len = req->length;
+	ci_req->hw_buf = req->buf;
 	goto flush;
 
 align:
-	/* Use internal buffer for small payloads. */
-	if (ep->req.length <= 64) {
-		ep->b_len = 64;
-		ep->b_buf = ep->b_fast;
-	} else {
-		ep->b_len = roundup(ep->req.length, ARCH_DMA_MINALIGN);
-		ep->b_buf = memalign(ARCH_DMA_MINALIGN, ep->b_len);
-		if (!ep->b_buf)
+	if (ci_req->b_buf && req->length > ci_req->b_len) {
+		free(ci_req->b_buf);
+		ci_req->b_buf = 0;
+	}
+	if (!ci_req->b_buf) {
+		ci_req->b_len = roundup(req->length, ARCH_DMA_MINALIGN);
+		ci_req->b_buf = memalign(ARCH_DMA_MINALIGN, ci_req->b_len);
+		if (!ci_req->b_buf)
 			return -ENOMEM;
 	}
+	ci_req->hw_len = ci_req->b_len;
+	ci_req->hw_buf = ci_req->b_buf;
+
 	if (in)
-		memcpy(ep->b_buf, ep->req.buf, ep->req.length);
+		memcpy(ci_req->hw_buf, req->buf, req->length);
 
 flush:
-	ba = (uint32_t)ep->b_buf;
-	flush_dcache_range(ba, ba + ep->b_len);
+	hwaddr = (uint32_t)ci_req->hw_buf;
+	aligned_used_len = roundup(req->length, ARCH_DMA_MINALIGN);
+	flush_dcache_range(hwaddr, hwaddr + aligned_used_len);
 
 	return 0;
 }
 
-static void ci_debounce(struct ci_ep *ep, int in)
+static void ci_debounce(struct ci_req *ci_req, int in)
 {
-	uint32_t addr = (uint32_t)ep->req.buf;
-	uint32_t ba = (uint32_t)ep->b_buf;
+	struct usb_request *req = &ci_req->req;
+	uint32_t addr = (uint32_t)req->buf;
+	uint32_t hwaddr = (uint32_t)ci_req->hw_buf;
+	uint32_t aligned_used_len;
 
-	if (in) {
-		if (addr == ba)
-			return;		/* not a bounce */
-		goto free;
-	}
-	invalidate_dcache_range(ba, ba + ep->b_len);
+	if (in)
+		return;
+
+	aligned_used_len = roundup(req->actual, ARCH_DMA_MINALIGN);
+	invalidate_dcache_range(hwaddr, hwaddr + aligned_used_len);
 
-	if (addr == ba)
-		return;		/* not a bounce */
+	if (addr == hwaddr)
+		return; /* not a bounce */
 
-	memcpy(ep->req.buf, ep->b_buf, ep->req.actual);
-free:
-	/* Large payloads use allocated buffer, free it. */
-	if (ep->b_buf != ep->b_fast)
-		free(ep->b_buf);
+	memcpy(req->buf, ci_req->hw_buf, req->actual);
 }
 
-static int ci_ep_queue(struct usb_ep *ep,
-		struct usb_request *req, gfp_t gfp_flags)
+static void ci_ep_submit_next_request(struct ci_ep *ci_ep)
 {
-	struct ci_ep *ci_ep = container_of(ep, struct ci_ep, ep);
 	struct ci_udc *udc = (struct ci_udc *)controller.ctrl->hcor;
 	struct ept_queue_item *item;
 	struct ept_queue_head *head;
-	int bit, num, len, in, ret;
+	int bit, num, len, in;
+	struct ci_req *ci_req;
+
+	ci_ep->req_primed = true;
+
 	num = ci_ep->desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
 	in = (ci_ep->desc->bEndpointAddress & USB_DIR_IN) != 0;
 	item = ci_get_qtd(num, in);
 	head = ci_get_qh(num, in);
-	len = req->length;
 
-	ret = ci_bounce(ci_ep, in);
-	if (ret)
-		return ret;
+	ci_req = list_first_entry(&ci_ep->queue, struct ci_req, queue);
+	len = ci_req->req.length;
 
 	item->next = TERMINATE;
 	item->info = INFO_BYTES(len) | INFO_IOC | INFO_ACTIVE;
-	item->page0 = (uint32_t)ci_ep->b_buf;
-	item->page1 = ((uint32_t)ci_ep->b_buf & 0xfffff000) + 0x1000;
-	item->page2 = ((uint32_t)ci_ep->b_buf & 0xfffff000) + 0x2000;
-	item->page3 = ((uint32_t)ci_ep->b_buf & 0xfffff000) + 0x3000;
-	item->page4 = ((uint32_t)ci_ep->b_buf & 0xfffff000) + 0x4000;
+	item->page0 = (uint32_t)ci_req->hw_buf;
+	item->page1 = ((uint32_t)ci_req->hw_buf & 0xfffff000) + 0x1000;
+	item->page2 = ((uint32_t)ci_req->hw_buf & 0xfffff000) + 0x2000;
+	item->page3 = ((uint32_t)ci_req->hw_buf & 0xfffff000) + 0x3000;
+	item->page4 = ((uint32_t)ci_req->hw_buf & 0xfffff000) + 0x4000;
 	ci_flush_qtd(num);
 
 	head->next = (unsigned) item;
 	head->info = 0;
 
-	DBG("ept%d %s queue len %x, buffer %p\n",
-	    num, in ? "in" : "out", len, ci_ep->b_buf);
+	DBG("ept%d %s queue len %x, req %p, buffer %p\n",
+	    num, in ? "in" : "out", len, ci_req, ci_req->hw_buf);
 	ci_flush_qh(num);
 
 	if (in)
@@ -368,6 +384,29 @@ static int ci_ep_queue(struct usb_ep *ep,
 		bit = EPT_RX(num);
 
 	writel(bit, &udc->epprime);
+}
+
+static int ci_ep_queue(struct usb_ep *ep,
+		struct usb_request *req, gfp_t gfp_flags)
+{
+	struct ci_ep *ci_ep = container_of(ep, struct ci_ep, ep);
+	struct ci_req *ci_req = container_of(req, struct ci_req, req);
+	int in, ret;
+	int __maybe_unused num;
+
+	num = ci_ep->desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
+	in = (ci_ep->desc->bEndpointAddress & USB_DIR_IN) != 0;
+
+	ret = ci_bounce(ci_req, in);
+	if (ret)
+		return ret;
+
+	DBG("ept%d %s pre-queue req %p, buffer %p\n",
+	    num, in ? "in" : "out", ci_req, ci_req->hw_buf);
+	list_add_tail(&ci_req->queue, &ci_ep->queue);
+
+	if (!ci_ep->req_primed)
+		ci_ep_submit_next_request(ci_ep);
 
 	return 0;
 }
@@ -376,6 +415,8 @@ static void handle_ep_complete(struct ci_ep *ep)
 {
 	struct ept_queue_item *item;
 	int num, in, len;
+	struct ci_req *ci_req;
+
 	num = ep->desc->bEndpointAddress & USB_ENDPOINT_NUMBER_MASK;
 	in = (ep->desc->bEndpointAddress & USB_DIR_IN) != 0;
 	if (num == 0)
@@ -383,20 +424,27 @@ static void handle_ep_complete(struct ci_ep *ep)
 	item = ci_get_qtd(num, in);
 	ci_invalidate_qtd(num);
 
+	len = (item->info >> 16) & 0x7fff;
 	if (item->info & 0xff)
 		printf("EP%d/%s FAIL info=%x pg0=%x\n",
 		       num, in ? "in" : "out", item->info, item->page0);
 
-	len = (item->info >> 16) & 0x7fff;
-	ep->req.actual = ep->req.length - len;
-	ci_debounce(ep, in);
+	ci_req = list_first_entry(&ep->queue, struct ci_req, queue);
+	list_del_init(&ci_req->queue);
+	ep->req_primed = false;
+
+	if (!list_empty(&ep->queue))
+		ci_ep_submit_next_request(ep);
+
+	ci_req->req.actual = ci_req->req.length - len;
+	ci_debounce(ci_req, in);
 
-	DBG("ept%d %s complete %x\n",
-			num, in ? "in" : "out", len);
-	ep->req.complete(&ep->ep, &ep->req);
+	DBG("ept%d %s req %p, complete %x\n",
+	    num, in ? "in" : "out", ci_req, len);
+	ci_req->req.complete(&ep->ep, &ci_req->req);
 	if (num == 0) {
-		ep->req.length = 0;
-		usb_ep_queue(&ep->ep, &ep->req, 0);
+		ci_req->req.length = 0;
+		usb_ep_queue(&ep->ep, &ci_req->req, 0);
 		ep->desc = &ep0_in_desc;
 	}
 }
@@ -405,13 +453,18 @@ static void handle_ep_complete(struct ci_ep *ep)
 
 static void handle_setup(void)
 {
-	struct usb_request *req = &controller.ep[0].req;
+	struct ci_ep *ci_ep = &controller.ep[0];
+	struct ci_req *ci_req;
+	struct usb_request *req;
 	struct ci_udc *udc = (struct ci_udc *)controller.ctrl->hcor;
 	struct ept_queue_head *head;
 	struct usb_ctrlrequest r;
 	int status = 0;
 	int num, in, _num, _in, i;
 	char *buf;
+
+	ci_req = list_first_entry(&ci_ep->queue, struct ci_req, queue);
+	req = &ci_req->req;
 	head = ci_get_qh(0, 0);	/* EP0 OUT */
 
 	ci_invalidate_qh(0);
@@ -424,6 +477,9 @@ static void handle_setup(void)
 	DBG("handle setup %s, %x, %x index %x value %x\n", reqname(r.bRequest),
 	    r.bRequestType, r.bRequest, r.wIndex, r.wValue);
 
+	list_del_init(&ci_req->queue);
+	ci_ep->req_primed = false;
+
 	switch (SETUP(r.bRequestType, r.bRequest)) {
 	case SETUP(USB_RECIP_ENDPOINT, USB_REQ_CLEAR_FEATURE):
 		_num = r.wIndex & 15;
@@ -701,6 +757,8 @@ static int ci_udc_probe(void)
 	/* Init EP 0 */
 	memcpy(&controller.ep[0].ep, &ci_ep_init[0], sizeof(*ci_ep_init));
 	controller.ep[0].desc = &ep0_in_desc;
+	INIT_LIST_HEAD(&controller.ep[0].queue);
+	controller.ep[0].req_primed = false;
 	controller.gadget.ep0 = &controller.ep[0].ep;
 	INIT_LIST_HEAD(&controller.gadget.ep0->ep_list);
 
@@ -708,6 +766,8 @@ static int ci_udc_probe(void)
 	for (i = 1; i < NUM_ENDPOINTS; i++) {
 		memcpy(&controller.ep[i].ep, &ci_ep_init[1],
 		       sizeof(*ci_ep_init));
+		INIT_LIST_HEAD(&controller.ep[i].queue);
+		controller.ep[i].req_primed = false;
 		list_add_tail(&controller.ep[i].ep.ep_list,
 			      &controller.gadget.ep_list);
 	}
diff --git a/drivers/usb/gadget/ci_udc.h b/drivers/usb/gadget/ci_udc.h
index 4425fd9..23cff56 100644
--- a/drivers/usb/gadget/ci_udc.h
+++ b/drivers/usb/gadget/ci_udc.h
@@ -77,15 +77,22 @@ struct ci_udc {
 #define CTRL_TXT_BULK	(2 << 18)
 #define CTRL_RXT_BULK	(2 << 2)
 
+struct ci_req {
+	struct usb_request	req;
+	struct list_head	queue;
+	/* Bounce buffer allocated if needed to align the transfer */
+	uint8_t *b_buf;
+	uint32_t b_len;
+	/* Buffer for the current transfer. Either req.buf/len or b_buf/len */
+	uint8_t *hw_buf;
+	uint32_t hw_len;
+};
+
 struct ci_ep {
 	struct usb_ep ep;
 	struct list_head queue;
+	bool req_primed;
 	const struct usb_endpoint_descriptor *desc;
-
-	struct usb_request req;
-	uint8_t *b_buf;
-	uint32_t b_len;
-	uint8_t b_fast[64] __aligned(ARCH_DMA_MINALIGN);
 };
 
 struct ci_drv {
diff --git a/drivers/usb/gadget/f_dfu.c b/drivers/usb/gadget/f_dfu.c
index 1b1e179..859fe82 100644
--- a/drivers/usb/gadget/f_dfu.c
+++ b/drivers/usb/gadget/f_dfu.c
@@ -175,10 +175,17 @@ static void dnload_request_flush(struct usb_ep *ep, struct usb_request *req)
 		  req->length, f_dfu->blk_seq_num);
 }
 
+static inline int dfu_get_manifest_timeout(struct dfu_entity *dfu)
+{
+	return dfu->poll_timeout ? dfu->poll_timeout(dfu) :
+		DFU_MANIFEST_POLL_TIMEOUT;
+}
+
 static void handle_getstatus(struct usb_request *req)
 {
 	struct dfu_status *dstat = (struct dfu_status *)req->buf;
 	struct f_dfu *f_dfu = req->context;
+	struct dfu_entity *dfu = dfu_get_entity(f_dfu->altsetting);
 
 	dfu_set_poll_timeout(dstat, 0);
 
@@ -191,7 +198,8 @@ static void handle_getstatus(struct usb_request *req)
 		f_dfu->dfu_state = DFU_STATE_dfuMANIFEST;
 		break;
 	case DFU_STATE_dfuMANIFEST:
-		dfu_set_poll_timeout(dstat, DFU_MANIFEST_POLL_TIMEOUT);
+		dfu_set_poll_timeout(dstat, dfu_get_manifest_timeout(dfu));
+		break;
 	default:
 		break;
 	}
diff --git a/drivers/usb/gadget/f_fastboot.c b/drivers/usb/gadget/f_fastboot.c
new file mode 100644
index 0000000..9dd85b6
--- /dev/null
+++ b/drivers/usb/gadget/f_fastboot.c
@@ -0,0 +1,513 @@
+/*
+ * (C) Copyright 2008 - 2009
+ * Windriver, <www.windriver.com>
+ * Tom Rix <Tom.Rix@windriver.com>
+ *
+ * Copyright 2011 Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+ *
+ * Copyright 2014 Linaro, Ltd.
+ * Rob Herring <robh@kernel.org>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+#include <common.h>
+#include <errno.h>
+#include <malloc.h>
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/composite.h>
+#include <linux/compiler.h>
+#include <version.h>
+#include <g_dnl.h>
+
+#define FASTBOOT_VERSION		"0.4"
+
+#define FASTBOOT_INTERFACE_CLASS	0xff
+#define FASTBOOT_INTERFACE_SUB_CLASS	0x42
+#define FASTBOOT_INTERFACE_PROTOCOL	0x03
+
+#define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_2_0  (0x0200)
+#define RX_ENDPOINT_MAXIMUM_PACKET_SIZE_1_1  (0x0040)
+#define TX_ENDPOINT_MAXIMUM_PACKET_SIZE      (0x0040)
+
+/* The 64 defined bytes plus \0 */
+#define RESPONSE_LEN	(64 + 1)
+
+#define EP_BUFFER_SIZE			4096
+
+struct f_fastboot {
+	struct usb_function usb_function;
+
+	/* IN/OUT EP's and correspoinding requests */
+	struct usb_ep *in_ep, *out_ep;
+	struct usb_request *in_req, *out_req;
+};
+
+static inline struct f_fastboot *func_to_fastboot(struct usb_function *f)
+{
+	return container_of(f, struct f_fastboot, usb_function);
+}
+
+static struct f_fastboot *fastboot_func;
+static unsigned int download_size;
+static unsigned int download_bytes;
+
+static struct usb_endpoint_descriptor fs_ep_in = {
+	.bLength            = USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType    = USB_DT_ENDPOINT,
+	.bEndpointAddress   = USB_DIR_IN,
+	.bmAttributes       = USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize     = TX_ENDPOINT_MAXIMUM_PACKET_SIZE,
+	.bInterval          = 0x00,
+};
+
+static struct usb_endpoint_descriptor fs_ep_out = {
+	.bLength		= USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType	= USB_DT_ENDPOINT,
+	.bEndpointAddress	= USB_DIR_OUT,
+	.bmAttributes		= USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize		= RX_ENDPOINT_MAXIMUM_PACKET_SIZE_1_1,
+	.bInterval		= 0x00,
+};
+
+static struct usb_endpoint_descriptor hs_ep_out = {
+	.bLength		= USB_DT_ENDPOINT_SIZE,
+	.bDescriptorType	= USB_DT_ENDPOINT,
+	.bEndpointAddress	= USB_DIR_OUT,
+	.bmAttributes		= USB_ENDPOINT_XFER_BULK,
+	.wMaxPacketSize		= RX_ENDPOINT_MAXIMUM_PACKET_SIZE_2_0,
+	.bInterval		= 0x00,
+};
+
+static struct usb_interface_descriptor interface_desc = {
+	.bLength		= USB_DT_INTERFACE_SIZE,
+	.bDescriptorType	= USB_DT_INTERFACE,
+	.bInterfaceNumber	= 0x00,
+	.bAlternateSetting	= 0x00,
+	.bNumEndpoints		= 0x02,
+	.bInterfaceClass	= FASTBOOT_INTERFACE_CLASS,
+	.bInterfaceSubClass	= FASTBOOT_INTERFACE_SUB_CLASS,
+	.bInterfaceProtocol	= FASTBOOT_INTERFACE_PROTOCOL,
+};
+
+static struct usb_descriptor_header *fb_runtime_descs[] = {
+	(struct usb_descriptor_header *)&interface_desc,
+	(struct usb_descriptor_header *)&fs_ep_in,
+	(struct usb_descriptor_header *)&hs_ep_out,
+	NULL,
+};
+
+/*
+ * static strings, in UTF-8
+ */
+static const char fastboot_name[] = "Android Fastboot";
+
+static struct usb_string fastboot_string_defs[] = {
+	[0].s = fastboot_name,
+	{  }			/* end of list */
+};
+
+static struct usb_gadget_strings stringtab_fastboot = {
+	.language	= 0x0409,	/* en-us */
+	.strings	= fastboot_string_defs,
+};
+
+static struct usb_gadget_strings *fastboot_strings[] = {
+	&stringtab_fastboot,
+	NULL,
+};
+
+static void rx_handler_command(struct usb_ep *ep, struct usb_request *req);
+
+static void fastboot_complete(struct usb_ep *ep, struct usb_request *req)
+{
+	int status = req->status;
+	if (!status)
+		return;
+	printf("status: %d ep '%s' trans: %d\n", status, ep->name, req->actual);
+}
+
+static int fastboot_bind(struct usb_configuration *c, struct usb_function *f)
+{
+	int id;
+	struct usb_gadget *gadget = c->cdev->gadget;
+	struct f_fastboot *f_fb = func_to_fastboot(f);
+
+	/* DYNAMIC interface numbers assignments */
+	id = usb_interface_id(c, f);
+	if (id < 0)
+		return id;
+	interface_desc.bInterfaceNumber = id;
+
+	id = usb_string_id(c->cdev);
+	if (id < 0)
+		return id;
+	fastboot_string_defs[0].id = id;
+	interface_desc.iInterface = id;
+
+	f_fb->in_ep = usb_ep_autoconfig(gadget, &fs_ep_in);
+	if (!f_fb->in_ep)
+		return -ENODEV;
+	f_fb->in_ep->driver_data = c->cdev;
+
+	f_fb->out_ep = usb_ep_autoconfig(gadget, &fs_ep_out);
+	if (!f_fb->out_ep)
+		return -ENODEV;
+	f_fb->out_ep->driver_data = c->cdev;
+
+	hs_ep_out.bEndpointAddress = fs_ep_out.bEndpointAddress;
+
+	return 0;
+}
+
+static void fastboot_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+	memset(fastboot_func, 0, sizeof(*fastboot_func));
+}
+
+static void fastboot_disable(struct usb_function *f)
+{
+	struct f_fastboot *f_fb = func_to_fastboot(f);
+
+	usb_ep_disable(f_fb->out_ep);
+	usb_ep_disable(f_fb->in_ep);
+
+	if (f_fb->out_req) {
+		free(f_fb->out_req->buf);
+		usb_ep_free_request(f_fb->out_ep, f_fb->out_req);
+		f_fb->out_req = NULL;
+	}
+	if (f_fb->in_req) {
+		free(f_fb->in_req->buf);
+		usb_ep_free_request(f_fb->in_ep, f_fb->in_req);
+		f_fb->in_req = NULL;
+	}
+}
+
+static struct usb_request *fastboot_start_ep(struct usb_ep *ep)
+{
+	struct usb_request *req;
+
+	req = usb_ep_alloc_request(ep, 0);
+	if (!req)
+		return NULL;
+
+	req->length = EP_BUFFER_SIZE;
+	req->buf = memalign(CONFIG_SYS_CACHELINE_SIZE, EP_BUFFER_SIZE);
+	if (!req->buf) {
+		usb_ep_free_request(ep, req);
+		return NULL;
+	}
+
+	memset(req->buf, 0, req->length);
+	return req;
+}
+
+static int fastboot_set_alt(struct usb_function *f,
+			    unsigned interface, unsigned alt)
+{
+	int ret;
+	struct usb_composite_dev *cdev = f->config->cdev;
+	struct usb_gadget *gadget = cdev->gadget;
+	struct f_fastboot *f_fb = func_to_fastboot(f);
+
+	debug("%s: func: %s intf: %d alt: %d\n",
+	      __func__, f->name, interface, alt);
+
+	/* make sure we don't enable the ep twice */
+	if (gadget->speed == USB_SPEED_HIGH)
+		ret = usb_ep_enable(f_fb->out_ep, &hs_ep_out);
+	else
+		ret = usb_ep_enable(f_fb->out_ep, &fs_ep_out);
+	if (ret) {
+		puts("failed to enable out ep\n");
+		return ret;
+	}
+
+	f_fb->out_req = fastboot_start_ep(f_fb->out_ep);
+	if (!f_fb->out_req) {
+		puts("failed to alloc out req\n");
+		ret = -EINVAL;
+		goto err;
+	}
+	f_fb->out_req->complete = rx_handler_command;
+
+	ret = usb_ep_enable(f_fb->in_ep, &fs_ep_in);
+	if (ret) {
+		puts("failed to enable in ep\n");
+		goto err;
+	}
+
+	f_fb->in_req = fastboot_start_ep(f_fb->in_ep);
+	if (!f_fb->in_req) {
+		puts("failed alloc req in\n");
+		ret = -EINVAL;
+		goto err;
+	}
+	f_fb->in_req->complete = fastboot_complete;
+
+	ret = usb_ep_queue(f_fb->out_ep, f_fb->out_req, 0);
+	if (ret)
+		goto err;
+
+	return 0;
+err:
+	fastboot_disable(f);
+	return ret;
+}
+
+static int fastboot_add(struct usb_configuration *c)
+{
+	struct f_fastboot *f_fb = fastboot_func;
+	int status;
+
+	debug("%s: cdev: 0x%p\n", __func__, c->cdev);
+
+	if (!f_fb) {
+		f_fb = memalign(CONFIG_SYS_CACHELINE_SIZE, sizeof(*f_fb));
+		if (!f_fb)
+			return -ENOMEM;
+
+		fastboot_func = f_fb;
+		memset(f_fb, 0, sizeof(*f_fb));
+	}
+
+	f_fb->usb_function.name = "f_fastboot";
+	f_fb->usb_function.hs_descriptors = fb_runtime_descs;
+	f_fb->usb_function.bind = fastboot_bind;
+	f_fb->usb_function.unbind = fastboot_unbind;
+	f_fb->usb_function.set_alt = fastboot_set_alt;
+	f_fb->usb_function.disable = fastboot_disable;
+	f_fb->usb_function.strings = fastboot_strings;
+
+	status = usb_add_function(c, &f_fb->usb_function);
+	if (status) {
+		free(f_fb);
+		fastboot_func = f_fb;
+	}
+
+	return status;
+}
+DECLARE_GADGET_BIND_CALLBACK(usb_dnl_fastboot, fastboot_add);
+
+int fastboot_tx_write(const char *buffer, unsigned int buffer_size)
+{
+	struct usb_request *in_req = fastboot_func->in_req;
+	int ret;
+
+	memcpy(in_req->buf, buffer, buffer_size);
+	in_req->length = buffer_size;
+	ret = usb_ep_queue(fastboot_func->in_ep, in_req, 0);
+	if (ret)
+		printf("Error %d on queue\n", ret);
+	return 0;
+}
+
+static int fastboot_tx_write_str(const char *buffer)
+{
+	return fastboot_tx_write(buffer, strlen(buffer));
+}
+
+static void compl_do_reset(struct usb_ep *ep, struct usb_request *req)
+{
+	do_reset(NULL, 0, 0, NULL);
+}
+
+static void cb_reboot(struct usb_ep *ep, struct usb_request *req)
+{
+	fastboot_func->in_req->complete = compl_do_reset;
+	fastboot_tx_write_str("OKAY");
+}
+
+static int strcmp_l1(const char *s1, const char *s2)
+{
+	if (!s1 || !s2)
+		return -1;
+	return strncmp(s1, s2, strlen(s1));
+}
+
+static void cb_getvar(struct usb_ep *ep, struct usb_request *req)
+{
+	char *cmd = req->buf;
+	char response[RESPONSE_LEN];
+	const char *s;
+
+	strcpy(response, "OKAY");
+	strsep(&cmd, ":");
+	if (!cmd) {
+		fastboot_tx_write_str("FAILmissing var");
+		return;
+	}
+
+	if (!strcmp_l1("version", cmd)) {
+		strncat(response, FASTBOOT_VERSION, sizeof(response));
+	} else if (!strcmp_l1("bootloader-version", cmd)) {
+		strncat(response, U_BOOT_VERSION, sizeof(response));
+	} else if (!strcmp_l1("downloadsize", cmd)) {
+		char str_num[12];
+
+		sprintf(str_num, "%08x", CONFIG_USB_FASTBOOT_BUF_SIZE);
+		strncat(response, str_num, sizeof(response));
+	} else if (!strcmp_l1("serialno", cmd)) {
+		s = getenv("serial#");
+		if (s)
+			strncat(response, s, sizeof(response));
+		else
+			strcpy(response, "FAILValue not set");
+	} else {
+		strcpy(response, "FAILVariable not implemented");
+	}
+	fastboot_tx_write_str(response);
+}
+
+static unsigned int rx_bytes_expected(void)
+{
+	int rx_remain = download_size - download_bytes;
+	if (rx_remain < 0)
+		return 0;
+	if (rx_remain > EP_BUFFER_SIZE)
+		return EP_BUFFER_SIZE;
+	return rx_remain;
+}
+
+#define BYTES_PER_DOT	0x20000
+static void rx_handler_dl_image(struct usb_ep *ep, struct usb_request *req)
+{
+	char response[RESPONSE_LEN];
+	unsigned int transfer_size = download_size - download_bytes;
+	const unsigned char *buffer = req->buf;
+	unsigned int buffer_size = req->actual;
+
+	if (req->status != 0) {
+		printf("Bad status: %d\n", req->status);
+		return;
+	}
+
+	if (buffer_size < transfer_size)
+		transfer_size = buffer_size;
+
+	memcpy((void *)CONFIG_USB_FASTBOOT_BUF_ADDR + download_bytes,
+	       buffer, transfer_size);
+
+	download_bytes += transfer_size;
+
+	/* Check if transfer is done */
+	if (download_bytes >= download_size) {
+		/*
+		 * Reset global transfer variable, keep download_bytes because
+		 * it will be used in the next possible flashing command
+		 */
+		download_size = 0;
+		req->complete = rx_handler_command;
+		req->length = EP_BUFFER_SIZE;
+
+		sprintf(response, "OKAY");
+		fastboot_tx_write_str(response);
+
+		printf("\ndownloading of %d bytes finished\n", download_bytes);
+	} else {
+		req->length = rx_bytes_expected();
+		if (req->length < ep->maxpacket)
+			req->length = ep->maxpacket;
+	}
+
+	if (download_bytes && !(download_bytes % BYTES_PER_DOT)) {
+		putc('.');
+		if (!(download_bytes % (74 * BYTES_PER_DOT)))
+			putc('\n');
+	}
+	req->actual = 0;
+	usb_ep_queue(ep, req, 0);
+}
+
+static void cb_download(struct usb_ep *ep, struct usb_request *req)
+{
+	char *cmd = req->buf;
+	char response[RESPONSE_LEN];
+
+	strsep(&cmd, ":");
+	download_size = simple_strtoul(cmd, NULL, 16);
+	download_bytes = 0;
+
+	printf("Starting download of %d bytes\n", download_size);
+
+	if (0 == download_size) {
+		sprintf(response, "FAILdata invalid size");
+	} else if (download_size > CONFIG_USB_FASTBOOT_BUF_SIZE) {
+		download_size = 0;
+		sprintf(response, "FAILdata too large");
+	} else {
+		sprintf(response, "DATA%08x", download_size);
+		req->complete = rx_handler_dl_image;
+		req->length = rx_bytes_expected();
+		if (req->length < ep->maxpacket)
+			req->length = ep->maxpacket;
+	}
+	fastboot_tx_write_str(response);
+}
+
+static void do_bootm_on_complete(struct usb_ep *ep, struct usb_request *req)
+{
+	char boot_addr_start[12];
+	char *bootm_args[] = { "bootm", boot_addr_start, NULL };
+
+	puts("Booting kernel..\n");
+
+	sprintf(boot_addr_start, "0x%lx", load_addr);
+	do_bootm(NULL, 0, 2, bootm_args);
+
+	/* This only happens if image is somehow faulty so we start over */
+	do_reset(NULL, 0, 0, NULL);
+}
+
+static void cb_boot(struct usb_ep *ep, struct usb_request *req)
+{
+	fastboot_func->in_req->complete = do_bootm_on_complete;
+	fastboot_tx_write_str("OKAY");
+}
+
+struct cmd_dispatch_info {
+	char *cmd;
+	void (*cb)(struct usb_ep *ep, struct usb_request *req);
+};
+
+static const struct cmd_dispatch_info cmd_dispatch_info[] = {
+	{
+		.cmd = "reboot",
+		.cb = cb_reboot,
+	}, {
+		.cmd = "getvar:",
+		.cb = cb_getvar,
+	}, {
+		.cmd = "download:",
+		.cb = cb_download,
+	}, {
+		.cmd = "boot",
+		.cb = cb_boot,
+	},
+};
+
+static void rx_handler_command(struct usb_ep *ep, struct usb_request *req)
+{
+	char *cmdbuf = req->buf;
+	void (*func_cb)(struct usb_ep *ep, struct usb_request *req) = NULL;
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(cmd_dispatch_info); i++) {
+		if (!strcmp_l1(cmd_dispatch_info[i].cmd, cmdbuf)) {
+			func_cb = cmd_dispatch_info[i].cb;
+			break;
+		}
+	}
+
+	if (!func_cb)
+		fastboot_tx_write_str("FAILunknown command");
+	else
+		func_cb(ep, req);
+
+	if (req->status == 0) {
+		*cmdbuf = '\0';
+		req->actual = 0;
+		usb_ep_queue(ep, req, 0);
+	}
+}
diff --git a/drivers/usb/gadget/f_thor.c b/drivers/usb/gadget/f_thor.c
index feef9e4..28f215e 100644
--- a/drivers/usb/gadget/f_thor.c
+++ b/drivers/usb/gadget/f_thor.c
@@ -219,21 +219,15 @@ static int download_tail(long long int left, int cnt)
 	}
 
 	/*
-	 * To store last "packet" DFU storage backend requires dfu_write with
-	 * size parameter equal to 0
+	 * To store last "packet" or write file from buffer to filesystem
+	 * DFU storage backend requires dfu_flush
 	 *
 	 * This also frees memory malloc'ed by dfu_get_buf(), so no explicit
 	 * need fo call dfu_free_buf() is needed.
 	 */
-	ret = dfu_write(dfu_entity, transfer_buffer, 0, cnt);
-	if (ret)
-		error("DFU write failed [%d] cnt: %d", ret, cnt);
-
 	ret = dfu_flush(dfu_entity, transfer_buffer, 0, cnt);
-	if (ret) {
+	if (ret)
 		error("DFU flush failed!");
-		return ret;
-	}
 
 	return ret;
 }
diff --git a/drivers/usb/gadget/storage_common.c b/drivers/usb/gadget/storage_common.c
index 7430074..02803df 100644
--- a/drivers/usb/gadget/storage_common.c
+++ b/drivers/usb/gadget/storage_common.c
@@ -311,11 +311,7 @@ static struct fsg_lun *fsg_lun_from_dev(struct device *dev)
 #define DELAYED_STATUS	(EP0_BUFSIZE + 999)	/* An impossibly large value */
 
 /* Number of buffers we will use.  2 is enough for double-buffering */
-#ifndef CONFIG_CI_UDC
 #define FSG_NUM_BUFFERS	2
-#else
-#define FSG_NUM_BUFFERS	1 /* ci_udc only allows 1 req per ep at present */
-#endif
 
 /* Default size of buffer length. */
 #define FSG_BUFLEN	((u32)16384)