Re: [U-Boot] [PATCH v2 2/8] usb: gadget: add SDP driver

On 08/16/2017 08:00 PM, Stefan Agner wrote:

From: Stefan Agner stefan.agner@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.agner@toradex.com

Reviewed-by: Łukasz Majewski lukma@denx.de

---

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.agner@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.agner@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_ */