From: Stefan Agner <stefan.ag...@toradex.com>

Add SDP (Serial Downloader Protocol) implementation for U-Boot. The
protocol is used in NXP SoC's boot ROM and allows to download program
images. Beside that, it can also be used to read/write registers and
download complete Device Configuration Data (DCD) sets. This basic
implementation supports downloading images with the imx header format
reading and writing registers.

Signed-off-by: Stefan Agner <stefan.ag...@toradex.com>
---

Changes in v2:
- Changed function signature of sdp_init/sdp_handle to allow specifying
  which USB controller should be used.
- Use #defines for security mode
- Improved types used in format strings

 drivers/usb/gadget/Kconfig  |   7 +
 drivers/usb/gadget/Makefile |   1 +
 drivers/usb/gadget/f_sdp.c  | 721 ++++++++++++++++++++++++++++++++++++++++++++
 include/sdp.h               |  16 +
 4 files changed, 745 insertions(+)
 create mode 100644 drivers/usb/gadget/f_sdp.c
 create mode 100644 include/sdp.h

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 261ed128ac..225b66bc95 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -103,6 +103,13 @@ config USB_GADGET_DOWNLOAD
 
 if USB_GADGET_DOWNLOAD
 
+config USB_FUNCTION_SDP
+       bool "Enable USB SDP (Serial Download Protocol)"
+       help
+         Enable Serial Download Protocol (SDP) device support in U-Boot. This
+         allows to download images into memory and execute (jump to) them
+         using the same protocol as implemented by the i.MX family's boot ROM.
+
 config G_DNL_MANUFACTURER
        string "Vendor name of USB device"
 
diff --git a/drivers/usb/gadget/Makefile b/drivers/usb/gadget/Makefile
index 5e316a7cff..6a007d1bcb 100644
--- a/drivers/usb/gadget/Makefile
+++ b/drivers/usb/gadget/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_USB_FUNCTION_THOR) += f_thor.o
 obj-$(CONFIG_USB_FUNCTION_DFU) += f_dfu.o
 obj-$(CONFIG_USB_FUNCTION_MASS_STORAGE) += f_mass_storage.o
 obj-$(CONFIG_USB_FUNCTION_FASTBOOT) += f_fastboot.o
+obj-$(CONFIG_USB_FUNCTION_SDP) += f_sdp.o
 endif
 endif
 ifdef CONFIG_USB_ETHER
diff --git a/drivers/usb/gadget/f_sdp.c b/drivers/usb/gadget/f_sdp.c
new file mode 100644
index 0000000000..9d82abcd69
--- /dev/null
+++ b/drivers/usb/gadget/f_sdp.c
@@ -0,0 +1,721 @@
+/*
+ * f_sdp.c -- USB HID Serial Download Protocol
+ *
+ * Copyright (C) 2017 Toradex
+ * Author: Stefan Agner <stefan.ag...@toradex.com>
+ *
+ * This file implements the Serial Download Protocol (SDP) as specified in
+ * the i.MX 6 Reference Manual. The SDP is a USB HID based protocol and
+ * allows to download images directly to memory. The implementation
+ * works with the imx_loader (imx_usb) USB client software on host side.
+ *
+ * Not all commands are implemented, e.g. WRITE_REGISTER, DCD_WRITE and
+ * SKIP_DCD_HEADER are only stubs.
+ *
+ * Parts of the implementation are based on f_dfu and f_thor.
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#include <errno.h>
+#include <common.h>
+#include <console.h>
+#include <malloc.h>
+
+#include <linux/usb/ch9.h>
+#include <linux/usb/gadget.h>
+#include <linux/usb/composite.h>
+
+#include <asm/io.h>
+#include <g_dnl.h>
+#include <sdp.h>
+#include <imximage.h>
+
+#define HID_REPORT_ID_MASK     0x000000ff
+
+/*
+ * HID class requests
+ */
+#define HID_REQ_GET_REPORT             0x01
+#define HID_REQ_GET_IDLE               0x02
+#define HID_REQ_GET_PROTOCOL           0x03
+#define HID_REQ_SET_REPORT             0x09
+#define HID_REQ_SET_IDLE               0x0A
+#define HID_REQ_SET_PROTOCOL           0x0B
+
+#define HID_USAGE_PAGE_LEN             76
+
+struct hid_report {
+       u8 usage_page[HID_USAGE_PAGE_LEN];
+} __packed;
+
+#define SDP_READ_REGISTER      0x0101
+#define SDP_WRITE_REGISTER     0x0202
+#define SDP_WRITE_FILE         0x0404
+#define SDP_ERROR_STATUS       0x0505
+#define SDP_DCD_WRITE          0x0a0a
+#define SDP_JUMP_ADDRESS       0x0b0b
+#define SDP_SKIP_DCD_HEADER    0x0c0c
+
+#define SDP_SECURITY_CLOSED            0x12343412
+#define SDP_SECURITY_OPEN              0x56787856
+
+#define SDP_WRITE_FILE_COMPLETE                0x88888888
+#define SDP_WRITE_REGISTER_COMPLETE    0x128A8A12
+#define SDP_SKIP_DCD_HEADER_COMPLETE   0x900DD009
+#define SDP_ERROR_IMXHEADER            0x000a0533
+
+#define SDP_COMMAND_LEN                16
+
+struct sdp_command {
+       u16 cmd;
+       u32 addr;
+       u8 format;
+       u32 cnt;
+       u32 data;
+       u8 rsvd;
+} __packed;
+
+enum sdp_state {
+       SDP_STATE_IDLE,
+       SDP_STATE_RX_DCD_DATA,
+       SDP_STATE_RX_FILE_DATA,
+       SDP_STATE_TX_SEC_CONF,
+       SDP_STATE_TX_SEC_CONF_BUSY,
+       SDP_STATE_TX_REGISTER,
+       SDP_STATE_TX_REGISTER_BUSY,
+       SDP_STATE_TX_STATUS,
+       SDP_STATE_TX_STATUS_BUSY,
+       SDP_STATE_JUMP,
+};
+
+struct f_sdp {
+       struct usb_function             usb_function;
+
+       struct usb_descriptor_header    **function;
+
+       u8                              altsetting;
+       enum sdp_state                  state;
+       enum sdp_state                  next_state;
+       u32                             dnl_address;
+       u32                             dnl_bytes_remaining;
+       u32                             jmp_address;
+       bool                            always_send_status;
+       u32                             error_status;
+
+       /* EP0 request */
+       struct usb_request              *req;
+
+       /* EP1 IN */
+       struct usb_ep                   *in_ep;
+       struct usb_request              *in_req;
+
+       bool                            configuration_done;
+};
+
+static struct f_sdp *sdp_func;
+
+static inline struct f_sdp *func_to_sdp(struct usb_function *f)
+{
+       return container_of(f, struct f_sdp, usb_function);
+}
+
+static struct usb_interface_descriptor sdp_intf_runtime = {
+       .bLength =              sizeof(sdp_intf_runtime),
+       .bDescriptorType =      USB_DT_INTERFACE,
+       .bAlternateSetting =    0,
+       .bNumEndpoints =        1,
+       .bInterfaceClass =      USB_CLASS_HID,
+       .bInterfaceSubClass =   0,
+       .bInterfaceProtocol =   0,
+       /* .iInterface = DYNAMIC */
+};
+
+/* HID configuration */
+static struct usb_class_hid_descriptor sdp_hid_desc = {
+       .bLength =              sizeof(sdp_hid_desc),
+       .bDescriptorType =      USB_DT_CS_DEVICE,
+
+       .bcdCDC =               __constant_cpu_to_le16(0x0110),
+       .bCountryCode =         0,
+       .bNumDescriptors =      1,
+
+       .bDescriptorType0       = USB_DT_HID_REPORT,
+       .wDescriptorLength0     = HID_USAGE_PAGE_LEN,
+};
+
+static struct usb_endpoint_descriptor in_desc = {
+       .bLength =              USB_DT_ENDPOINT_SIZE,
+       .bDescriptorType =      USB_DT_ENDPOINT, /*USB_DT_CS_ENDPOINT*/
+
+       .bEndpointAddress =     1 | USB_DIR_IN,
+       .bmAttributes = USB_ENDPOINT_XFER_INT,
+       .wMaxPacketSize =       64,
+       .bInterval =            1,
+};
+
+static struct usb_descriptor_header *sdp_runtime_descs[] = {
+       (struct usb_descriptor_header *)&sdp_intf_runtime,
+       (struct usb_descriptor_header *)&sdp_hid_desc,
+       (struct usb_descriptor_header *)&in_desc,
+       NULL,
+};
+
+/* This is synchronized with what the SoC implementation reports */
+static struct hid_report sdp_hid_report = {
+       .usage_page = {
+               0x06, 0x00, 0xff, /* Usage Page */
+               0x09, 0x01, /* Usage (Pointer?) */
+               0xa1, 0x01, /* Collection */
+
+               0x85, 0x01, /* Report ID */
+               0x19, 0x01, /* Usage Minimum */
+               0x29, 0x01, /* Usage Maximum */
+               0x15, 0x00, /* Local Minimum */
+               0x26, 0xFF, 0x00, /* Local Maximum? */
+               0x75, 0x08, /* Report Size */
+               0x95, 0x10, /* Report Count */
+               0x91, 0x02, /* Output Data */
+
+               0x85, 0x02, /* Report ID */
+               0x19, 0x01, /* Usage Minimum */
+               0x29, 0x01, /* Usage Maximum */
+               0x15, 0x00, /* Local Minimum */
+               0x26, 0xFF, 0x00, /* Local Maximum? */
+               0x75, 0x80, /* Report Size 128 */
+               0x95, 0x40, /* Report Count */
+               0x91, 0x02, /* Output Data */
+
+               0x85, 0x03, /* Report ID */
+               0x19, 0x01, /* Usage Minimum */
+               0x29, 0x01, /* Usage Maximum */
+               0x15, 0x00, /* Local Minimum */
+               0x26, 0xFF, 0x00, /* Local Maximum? */
+               0x75, 0x08, /* Report Size 8 */
+               0x95, 0x04, /* Report Count */
+               0x81, 0x02, /* Input Data */
+
+               0x85, 0x04, /* Report ID */
+               0x19, 0x01, /* Usage Minimum */
+               0x29, 0x01, /* Usage Maximum */
+               0x15, 0x00, /* Local Minimum */
+               0x26, 0xFF, 0x00, /* Local Maximum? */
+               0x75, 0x08, /* Report Size 8 */
+               0x95, 0x40, /* Report Count */
+               0x81, 0x02, /* Input Data */
+               0xc0
+       },
+};
+
+static const char sdp_name[] = "Serial Downloader Protocol";
+
+/*
+ * static strings, in UTF-8
+ */
+static struct usb_string strings_sdp_generic[] = {
+       [0].s = sdp_name,
+       {  }                    /* end of list */
+};
+
+static struct usb_gadget_strings stringtab_sdp_generic = {
+       .language       = 0x0409,       /* en-us */
+       .strings        = strings_sdp_generic,
+};
+
+static struct usb_gadget_strings *sdp_generic_strings[] = {
+       &stringtab_sdp_generic,
+       NULL,
+};
+
+static void sdp_rx_command_complete(struct usb_ep *ep, struct usb_request *req)
+{
+       struct f_sdp *sdp = req->context;
+       int status = req->status;
+       u8 *data = req->buf;
+       u8 report = data[0];
+
+       if (status != 0) {
+               error("Status: %d", status);
+               return;
+       }
+
+       if (report != 1) {
+               error("Unexpected report %d", report);
+               return;
+       }
+
+       struct sdp_command *cmd = req->buf + 1;
+
+       debug("%s: command: %04x, addr: %08x, cnt: %u\n",
+             __func__, be16_to_cpu(cmd->cmd),
+             be32_to_cpu(cmd->addr), be32_to_cpu(cmd->cnt));
+
+       switch (be16_to_cpu(cmd->cmd)) {
+       case SDP_READ_REGISTER:
+               sdp->always_send_status = false;
+               sdp->error_status = 0x0;
+
+               sdp->state = SDP_STATE_TX_SEC_CONF;
+               sdp->dnl_address = be32_to_cpu(cmd->addr);
+               sdp->dnl_bytes_remaining = be32_to_cpu(cmd->cnt);
+               sdp->next_state = SDP_STATE_TX_REGISTER;
+               printf("Reading %d registers at 0x%08x... ",
+                      sdp->dnl_bytes_remaining, sdp->dnl_address);
+               break;
+       case SDP_WRITE_FILE:
+               sdp->always_send_status = true;
+               sdp->error_status = SDP_WRITE_FILE_COMPLETE;
+
+               sdp->state = SDP_STATE_RX_FILE_DATA;
+               sdp->dnl_address = be32_to_cpu(cmd->addr);
+               sdp->dnl_bytes_remaining = be32_to_cpu(cmd->cnt);
+               sdp->next_state = SDP_STATE_IDLE;
+
+               printf("Downloading file of size %d to 0x%08x... ",
+                      sdp->dnl_bytes_remaining, sdp->dnl_address);
+
+               break;
+       case SDP_ERROR_STATUS:
+               sdp->always_send_status = true;
+               sdp->error_status = 0;
+
+               sdp->state = SDP_STATE_TX_SEC_CONF;
+               sdp->next_state = SDP_STATE_IDLE;
+               break;
+       case SDP_DCD_WRITE:
+               sdp->always_send_status = true;
+               sdp->error_status = SDP_WRITE_REGISTER_COMPLETE;
+
+               sdp->state = SDP_STATE_RX_DCD_DATA;
+               sdp->dnl_bytes_remaining = be32_to_cpu(cmd->cnt);
+               sdp->next_state = SDP_STATE_IDLE;
+               break;
+       case SDP_JUMP_ADDRESS:
+               sdp->always_send_status = false;
+               sdp->error_status = 0;
+
+               sdp->jmp_address = be32_to_cpu(cmd->addr);
+               sdp->state = SDP_STATE_TX_SEC_CONF;
+               sdp->next_state = SDP_STATE_JUMP;
+               break;
+       case SDP_SKIP_DCD_HEADER:
+               sdp->always_send_status = true;
+               sdp->error_status = SDP_SKIP_DCD_HEADER_COMPLETE;
+
+               /* Ignore command, DCD not supported anyway */
+               sdp->state = SDP_STATE_TX_SEC_CONF;
+               sdp->next_state = SDP_STATE_IDLE;
+               break;
+       default:
+               error("Unknown command: %04x\n", be16_to_cpu(cmd->cmd));
+       }
+}
+
+static void sdp_rx_data_complete(struct usb_ep *ep, struct usb_request *req)
+{
+       struct f_sdp *sdp = req->context;
+       int status = req->status;
+       u8 *data = req->buf;
+       u8 report = data[0];
+       int datalen = req->length - 1;
+
+       if (status != 0) {
+               error("Status: %d", status);
+               return;
+       }
+
+       if (report != 2) {
+               error("Unexpected report %d", report);
+               return;
+       }
+
+       if (sdp->dnl_bytes_remaining < datalen) {
+               /*
+                * Some USB stacks require to send a complete buffer as
+                * specified in the HID descriptor. This leads to longer
+                * transfers than the file length, no problem for us.
+                */
+               sdp->dnl_bytes_remaining = 0;
+       } else {
+               sdp->dnl_bytes_remaining -= datalen;
+       }
+
+       if (sdp->state == SDP_STATE_RX_FILE_DATA) {
+               memcpy((void *)sdp->dnl_address, req->buf + 1, datalen);
+               sdp->dnl_address += datalen;
+       }
+
+       if (sdp->dnl_bytes_remaining)
+               return;
+
+       printf("done\n");
+
+       switch (sdp->state) {
+       case SDP_STATE_RX_FILE_DATA:
+               sdp->state = SDP_STATE_TX_SEC_CONF;
+               break;
+       case SDP_STATE_RX_DCD_DATA:
+               sdp->state = SDP_STATE_TX_SEC_CONF;
+               break;
+       default:
+               error("Invalid state: %d", sdp->state);
+       }
+}
+
+static void sdp_tx_complete(struct usb_ep *ep, struct usb_request *req)
+{
+       struct f_sdp *sdp = req->context;
+       int status = req->status;
+
+       if (status != 0) {
+               error("Status: %d", status);
+               return;
+       }
+
+       switch (sdp->state) {
+       case SDP_STATE_TX_SEC_CONF_BUSY:
+               /* Not all commands require status report */
+               if (sdp->always_send_status || sdp->error_status)
+                       sdp->state = SDP_STATE_TX_STATUS;
+               else
+                       sdp->state = sdp->next_state;
+
+               break;
+       case SDP_STATE_TX_STATUS_BUSY:
+               sdp->state = sdp->next_state;
+               break;
+       case SDP_STATE_TX_REGISTER_BUSY:
+               if (sdp->dnl_bytes_remaining)
+                       sdp->state = SDP_STATE_TX_REGISTER;
+               else
+                       sdp->state = SDP_STATE_IDLE;
+               break;
+       default:
+               error("Wrong State: %d", sdp->state);
+               sdp->state = SDP_STATE_IDLE;
+               break;
+       }
+       debug("%s complete --> %d, %d/%d\n", ep->name,
+             status, req->actual, req->length);
+}
+
+static int sdp_setup(struct usb_function *f, const struct usb_ctrlrequest 
*ctrl)
+{
+       struct usb_gadget *gadget = f->config->cdev->gadget;
+       struct usb_request *req = f->config->cdev->req;
+       struct f_sdp *sdp = f->config->cdev->req->context;
+       u16 len = le16_to_cpu(ctrl->wLength);
+       u16 w_value = le16_to_cpu(ctrl->wValue);
+       int value = 0;
+       u8 req_type = ctrl->bRequestType & USB_TYPE_MASK;
+
+       debug("w_value: 0x%04x len: 0x%04x\n", w_value, len);
+       debug("req_type: 0x%02x ctrl->bRequest: 0x%02x sdp->state: %d\n",
+             req_type, ctrl->bRequest, sdp->state);
+
+       if (req_type == USB_TYPE_STANDARD) {
+               if (ctrl->bRequest == USB_REQ_GET_DESCRIPTOR) {
+                       /* Send HID report descriptor */
+                       value = min(len, (u16) sizeof(sdp_hid_report));
+                       memcpy(req->buf, &sdp_hid_report, value);
+                       sdp->configuration_done = true;
+               }
+       }
+
+       if (req_type == USB_TYPE_CLASS) {
+               int report = w_value & HID_REPORT_ID_MASK;
+
+               /* HID (SDP) request */
+               switch (ctrl->bRequest) {
+               case HID_REQ_SET_REPORT:
+                       switch (report) {
+                       case 1:
+                               value = SDP_COMMAND_LEN + 1;
+                               req->complete = sdp_rx_command_complete;
+                               break;
+                       case 2:
+                               value = len;
+                               req->complete = sdp_rx_data_complete;
+                               break;
+                       }
+               }
+       }
+
+       if (value >= 0) {
+               req->length = value;
+               req->zero = value < len;
+               value = usb_ep_queue(gadget->ep0, req, 0);
+               if (value < 0) {
+                       debug("ep_queue --> %d\n", value);
+                       req->status = 0;
+               }
+       }
+
+       return value;
+}
+
+static int sdp_bind(struct usb_configuration *c, struct usb_function *f)
+{
+       struct usb_gadget *gadget = c->cdev->gadget;
+       struct usb_composite_dev *cdev = c->cdev;
+       struct f_sdp *sdp = func_to_sdp(f);
+       int rv = 0, id;
+
+       id = usb_interface_id(c, f);
+       if (id < 0)
+               return id;
+       sdp_intf_runtime.bInterfaceNumber = id;
+
+       struct usb_ep *ep;
+
+       /* allocate instance-specific endpoints */
+       ep = usb_ep_autoconfig(gadget, &in_desc);
+       if (!ep) {
+               rv = -ENODEV;
+               goto error;
+       }
+
+       sdp->in_ep = ep; /* Store IN EP for enabling @ setup */
+
+       cdev->req->context = sdp;
+
+error:
+       return rv;
+}
+
+static void sdp_unbind(struct usb_configuration *c, struct usb_function *f)
+{
+       free(sdp_func);
+       sdp_func = NULL;
+}
+
+static struct usb_request *alloc_ep_req(struct usb_ep *ep, unsigned length)
+{
+       struct usb_request *req;
+
+       req = usb_ep_alloc_request(ep, 0);
+       if (!req)
+               return req;
+
+       req->length = length;
+       req->buf = memalign(CONFIG_SYS_CACHELINE_SIZE, length);
+       if (!req->buf) {
+               usb_ep_free_request(ep, req);
+               req = NULL;
+       }
+
+       return req;
+}
+
+
+static struct usb_request *sdp_start_ep(struct usb_ep *ep)
+{
+       struct usb_request *req;
+
+       req = alloc_ep_req(ep, 64);
+       debug("%s: ep:%p req:%p\n", __func__, ep, req);
+
+       if (!req)
+               return NULL;
+
+       memset(req->buf, 0, req->length);
+       req->complete = sdp_tx_complete;
+
+       return req;
+}
+static int sdp_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
+{
+       struct f_sdp *sdp = func_to_sdp(f);
+       struct usb_composite_dev *cdev = f->config->cdev;
+       int result;
+
+       debug("%s: intf: %d alt: %d\n", __func__, intf, alt);
+
+       result = usb_ep_enable(sdp->in_ep, &in_desc);
+       if (result)
+               return result;
+       sdp->in_req = sdp_start_ep(sdp->in_ep);
+       sdp->in_req->context = sdp;
+
+       sdp->in_ep->driver_data = cdev; /* claim */
+
+       sdp->altsetting = alt;
+       sdp->state = SDP_STATE_IDLE;
+
+       return 0;
+}
+
+static int sdp_get_alt(struct usb_function *f, unsigned intf)
+{
+       struct f_sdp *sdp = func_to_sdp(f);
+
+       return sdp->altsetting;
+}
+
+static void sdp_disable(struct usb_function *f)
+{
+       struct f_sdp *sdp = func_to_sdp(f);
+
+       usb_ep_disable(sdp->in_ep);
+
+       if (sdp->in_req) {
+               free(sdp->in_req);
+               sdp->in_req = NULL;
+       }
+}
+
+static int sdp_bind_config(struct usb_configuration *c)
+{
+       int status;
+
+       if (!sdp_func) {
+               sdp_func = memalign(CONFIG_SYS_CACHELINE_SIZE, 
sizeof(*sdp_func));
+               if (!sdp_func)
+                       return -ENOMEM;
+       }
+
+       memset(sdp_func, 0, sizeof(*sdp_func));
+
+       sdp_func->usb_function.name = "sdp";
+       sdp_func->usb_function.hs_descriptors = sdp_runtime_descs;
+       sdp_func->usb_function.descriptors = sdp_runtime_descs;
+       sdp_func->usb_function.bind = sdp_bind;
+       sdp_func->usb_function.unbind = sdp_unbind;
+       sdp_func->usb_function.set_alt = sdp_set_alt;
+       sdp_func->usb_function.get_alt = sdp_get_alt;
+       sdp_func->usb_function.disable = sdp_disable;
+       sdp_func->usb_function.strings = sdp_generic_strings;
+       sdp_func->usb_function.setup = sdp_setup;
+
+       status = usb_add_function(c, &sdp_func->usb_function);
+
+       return status;
+}
+
+int sdp_init(int controller_index)
+{
+       printf("SDP: initialize...\n");
+       while (!sdp_func->configuration_done) {
+               if (ctrlc()) {
+                       puts("\rCTRL+C - Operation aborted.\n");
+                       return 1;
+               }
+               usb_gadget_handle_interrupts(controller_index);
+       }
+
+       return 0;
+}
+
+static u32 sdp_jump_imxheader(void *address)
+{
+       flash_header_v2_t *headerv2 = address;
+       ulong (*entry)(void);
+
+       if (headerv2->header.tag != IVT_HEADER_TAG) {
+               printf("Header Tag is not an IMX image\n");
+               return SDP_ERROR_IMXHEADER;
+       }
+
+       printf("Jumping to 0x%08x\n", headerv2->entry);
+       entry = (void *)headerv2->entry;
+       entry();
+
+       /* The image probably never returns hence we won't reach that point */
+       return 0;
+}
+
+static void sdp_handle_in_ep(void)
+{
+       u8 *data = sdp_func->in_req->buf;
+       u32 status;
+       int datalen;
+
+       switch (sdp_func->state) {
+       case SDP_STATE_TX_SEC_CONF:
+               debug("Report 3: HAB security\n");
+               data[0] = 3;
+
+               status = SDP_SECURITY_OPEN;
+               memcpy(&data[1], &status, 4);
+               sdp_func->in_req->length = 5;
+               usb_ep_queue(sdp_func->in_ep, sdp_func->in_req, 0);
+               sdp_func->state = SDP_STATE_TX_SEC_CONF_BUSY;
+               break;
+
+       case SDP_STATE_TX_STATUS:
+               debug("Report 4: Status\n");
+               data[0] = 4;
+
+               memcpy(&data[1], &sdp_func->error_status, 4);
+               sdp_func->in_req->length = 65;
+               usb_ep_queue(sdp_func->in_ep, sdp_func->in_req, 0);
+               sdp_func->state = SDP_STATE_TX_STATUS_BUSY;
+               break;
+       case SDP_STATE_TX_REGISTER:
+               debug("Report 4: Register Values\n");
+               data[0] = 4;
+
+               datalen = sdp_func->dnl_bytes_remaining;
+
+               if (datalen > 64)
+                       datalen = 64;
+
+               memcpy(&data[1], (void *)sdp_func->dnl_address, datalen);
+               sdp_func->in_req->length = 65;
+
+               sdp_func->dnl_bytes_remaining -= datalen;
+               sdp_func->dnl_address += datalen;
+
+               usb_ep_queue(sdp_func->in_ep, sdp_func->in_req, 0);
+               sdp_func->state = SDP_STATE_TX_REGISTER_BUSY;
+               break;
+       case SDP_STATE_JUMP:
+               printf("Checking imxheader at 0x%08x\n", f_sdp->jmp_address);
+               status = sdp_jump_imxheader((void *)f_sdp->jmp_address);
+
+               sdp_func->next_state = SDP_STATE_IDLE;
+               sdp_func->error_status = status;
+
+               /* Only send Report 4 if there was an error */
+               if (status)
+                       sdp_func->state = SDP_STATE_TX_STATUS;
+               else
+                       sdp_func->state = SDP_STATE_IDLE;
+               break;
+       default:
+               break;
+       };
+}
+
+void sdp_handle(int controller_index)
+{
+       printf("SDP: handle requests...\n");
+       while (1) {
+               if (ctrlc()) {
+                       puts("\rCTRL+C - Operation aborted.\n");
+                       return;
+               }
+
+               usb_gadget_handle_interrupts(controller_index);
+
+               sdp_handle_in_ep();
+       }
+}
+
+int sdp_add(struct usb_configuration *c)
+{
+       int id;
+
+       id = usb_string_id(c->cdev);
+       if (id < 0)
+               return id;
+       strings_sdp_generic[0].id = id;
+       sdp_intf_runtime.iInterface = id;
+
+       debug("%s: cdev: %p gadget: %p gadget->ep0: %p\n", __func__,
+             c->cdev, c->cdev->gadget, c->cdev->gadget->ep0);
+
+       return sdp_bind_config(c);
+}
+
+DECLARE_GADGET_BIND_CALLBACK(usb_dnl_sdp, sdp_add);
diff --git a/include/sdp.h b/include/sdp.h
new file mode 100644
index 0000000000..f476bab8f1
--- /dev/null
+++ b/include/sdp.h
@@ -0,0 +1,16 @@
+/*
+ * sdp.h - Serial Download Protocol
+ *
+ * Copyright (C) 2017 Toradex
+ * Author: Stefan Agner <stefan.ag...@toradex.com>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+
+#ifndef __SDP_H_
+#define __SDP_H_
+
+int sdp_init(int controller_index);
+void sdp_handle(int controller_index);
+
+#endif /* __SDP_H_ */
-- 
2.14.1

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