feat(drivers/usb): add a USB device stack
Add a new USB framework to manage an USB device profile (USBD)
based on a peripheral controller driver (PCD).
This USB stack can be use to implement any Universal Serial Bus Device
Class in TF-A on top of a USB driver defined in the platform.
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Change-Id: I7971ec6d952edec3511157a198e6e5359df4346b
diff --git a/drivers/usb/usb_device.c b/drivers/usb/usb_device.c
new file mode 100644
index 0000000..ce02d4f
--- /dev/null
+++ b/drivers/usb/usb_device.c
@@ -0,0 +1,840 @@
+/*
+ * Copyright (c) 2021, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <stdint.h>
+
+#include <common/debug.h>
+#include <drivers/usb_device.h>
+
+/* Define for EP address */
+#define EP_DIR_MASK BIT(7)
+#define EP_DIR_IN BIT(7)
+#define EP_NUM_MASK GENMASK(3, 0)
+
+#define EP0_IN (0U | EP_DIR_IN)
+#define EP0_OUT 0U
+
+/* USB address between 1 through 127 = 0x7F mask */
+#define ADDRESS_MASK GENMASK(6, 0)
+
+/*
+ * Set a STALL condition over an endpoint
+ * pdev: USB handle
+ * ep_addr: endpoint address
+ * return : status
+ */
+static enum usb_status usb_core_set_stall(struct usb_handle *pdev, uint8_t ep_addr)
+{
+ struct usbd_ep *ep;
+ struct pcd_handle *hpcd = (struct pcd_handle *)pdev->data;
+ uint8_t num;
+
+ num = ep_addr & EP_NUM_MASK;
+ if (num >= USBD_EP_NB) {
+ return USBD_FAIL;
+ }
+ if ((EP_DIR_MASK & ep_addr) == EP_DIR_IN) {
+ ep = &hpcd->in_ep[num];
+ ep->is_in = true;
+ } else {
+ ep = &hpcd->out_ep[num];
+ ep->is_in = false;
+ }
+ ep->num = num;
+
+ pdev->driver->ep_set_stall(hpcd->instance, ep);
+ if (num == 0U) {
+ pdev->driver->ep0_out_start(hpcd->instance);
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_get_desc
+ * Handle Get Descriptor requests
+ * pdev : device instance
+ * req : usb request
+ */
+static void usb_core_get_desc(struct usb_handle *pdev, struct usb_setup_req *req)
+{
+ uint16_t len;
+ uint8_t *pbuf;
+ uint8_t desc_type = HIBYTE(req->value);
+ uint8_t desc_idx = LOBYTE(req->value);
+
+ switch (desc_type) {
+ case USB_DESC_TYPE_DEVICE:
+ pbuf = pdev->desc->get_device_desc(&len);
+ break;
+
+ case USB_DESC_TYPE_CONFIGURATION:
+ pbuf = (uint8_t *)pdev->desc->get_config_desc(&len);
+ pbuf[1] = USB_DESC_TYPE_CONFIGURATION;
+ break;
+
+ case USB_DESC_TYPE_STRING:
+ switch (desc_idx) {
+ case USBD_IDX_LANGID_STR:
+ pbuf = pdev->desc->get_lang_id_desc(&len);
+ break;
+
+ case USBD_IDX_MFC_STR:
+ pbuf = pdev->desc->get_manufacturer_desc(&len);
+ break;
+
+ case USBD_IDX_PRODUCT_STR:
+ pbuf = pdev->desc->get_product_desc(&len);
+ break;
+
+ case USBD_IDX_SERIAL_STR:
+ pbuf = pdev->desc->get_serial_desc(&len);
+ break;
+
+ case USBD_IDX_CONFIG_STR:
+ pbuf = pdev->desc->get_configuration_desc(&len);
+ break;
+
+ case USBD_IDX_INTERFACE_STR:
+ pbuf = pdev->desc->get_interface_desc(&len);
+ break;
+
+ /* For all USER string */
+ case USBD_IDX_USER0_STR:
+ default:
+ pbuf = pdev->desc->get_usr_desc(desc_idx - USBD_IDX_USER0_STR, &len);
+ break;
+ }
+ break;
+
+ case USB_DESC_TYPE_DEVICE_QUALIFIER:
+ pbuf = (uint8_t *)pdev->desc->get_device_qualifier_desc(&len);
+ break;
+
+ case USB_DESC_TYPE_OTHER_SPEED_CONFIGURATION:
+ pbuf = (uint8_t *)pdev->desc->get_config_desc(&len);
+ pbuf[1] = USB_DESC_TYPE_OTHER_SPEED_CONFIGURATION;
+ break;
+
+ default:
+ ERROR("Unknown request %i\n", desc_type);
+ usb_core_ctl_error(pdev);
+ return;
+ }
+
+ if ((len != 0U) && (req->length != 0U)) {
+ len = MIN(len, req->length);
+
+ /* Start the transfer */
+ usb_core_transmit_ep0(pdev, pbuf, len);
+ }
+}
+
+/*
+ * usb_core_set_config
+ * Handle Set device configuration request
+ * pdev : device instance
+ * req : usb request
+ */
+static void usb_core_set_config(struct usb_handle *pdev, struct usb_setup_req *req)
+{
+ static uint8_t cfgidx;
+
+ cfgidx = LOBYTE(req->value);
+
+ if (cfgidx > USBD_MAX_NUM_CONFIGURATION) {
+ usb_core_ctl_error(pdev);
+ return;
+ }
+
+ switch (pdev->dev_state) {
+ case USBD_STATE_ADDRESSED:
+ if (cfgidx != 0U) {
+ pdev->dev_config = cfgidx;
+ pdev->dev_state = USBD_STATE_CONFIGURED;
+ if (!pdev->class) {
+ usb_core_ctl_error(pdev);
+ return;
+ }
+ /* Set configuration and Start the Class */
+ if (pdev->class->init(pdev, cfgidx) != 0U) {
+ usb_core_ctl_error(pdev);
+ return;
+ }
+ }
+ break;
+
+ case USBD_STATE_CONFIGURED:
+ if (cfgidx == 0U) {
+ pdev->dev_state = USBD_STATE_ADDRESSED;
+ pdev->dev_config = cfgidx;
+ pdev->class->de_init(pdev, cfgidx);
+ } else if (cfgidx != pdev->dev_config) {
+ if (pdev->class != NULL) {
+ usb_core_ctl_error(pdev);
+ return;
+ }
+ /* Clear old configuration */
+ pdev->class->de_init(pdev, pdev->dev_config);
+ /* Set new configuration */
+ pdev->dev_config = cfgidx;
+ /* Set configuration and start the USB class */
+ if (pdev->class->init(pdev, cfgidx) != 0U) {
+ usb_core_ctl_error(pdev);
+ return;
+ }
+ }
+ break;
+
+ default:
+ usb_core_ctl_error(pdev);
+ return;
+ }
+
+ /* Send status */
+ usb_core_transmit_ep0(pdev, NULL, 0U);
+}
+
+/*
+ * usb_core_get_status
+ * Handle Get Status request
+ * pdev : device instance
+ * req : usb request
+ */
+static void usb_core_get_status(struct usb_handle *pdev,
+ struct usb_setup_req *req)
+{
+ if ((pdev->dev_state != USBD_STATE_ADDRESSED) &&
+ (pdev->dev_state != USBD_STATE_CONFIGURED)) {
+ usb_core_ctl_error(pdev);
+ return;
+ }
+
+ pdev->dev_config_status = USB_CONFIG_SELF_POWERED;
+
+ if (pdev->dev_remote_wakeup != 0U) {
+ pdev->dev_config_status |= USB_CONFIG_REMOTE_WAKEUP;
+ }
+
+ /* Start the transfer */
+ usb_core_transmit_ep0(pdev, (uint8_t *)&pdev->dev_config_status, 2U);
+}
+
+/*
+ * usb_core_set_address
+ * Set device address
+ * pdev : device instance
+ * req : usb request
+ */
+static void usb_core_set_address(struct usb_handle *pdev,
+ struct usb_setup_req *req)
+{
+ uint8_t dev_addr;
+
+ if ((req->index != 0U) || (req->length != 0U)) {
+ usb_core_ctl_error(pdev);
+ return;
+ }
+
+ dev_addr = req->value & ADDRESS_MASK;
+ if (pdev->dev_state != USBD_STATE_DEFAULT) {
+ usb_core_ctl_error(pdev);
+ return;
+ }
+
+ pdev->dev_address = dev_addr;
+ pdev->driver->set_address(((struct pcd_handle *)(pdev->data))->instance, dev_addr);
+
+ /* Send status */
+ usb_core_transmit_ep0(pdev, NULL, 0U);
+
+ if (dev_addr != 0U) {
+ pdev->dev_state = USBD_STATE_ADDRESSED;
+ } else {
+ pdev->dev_state = USBD_STATE_DEFAULT;
+ }
+}
+
+/*
+ * usb_core_dev_req
+ * Handle standard usb device requests
+ * pdev : device instance
+ * req : usb request
+ * return : status
+ */
+static enum usb_status usb_core_dev_req(struct usb_handle *pdev,
+ struct usb_setup_req *req)
+{
+ VERBOSE("receive request %i\n", req->b_request);
+ switch (req->b_request) {
+ case USB_REQ_GET_DESCRIPTOR:
+ usb_core_get_desc(pdev, req);
+ break;
+
+ case USB_REQ_SET_CONFIGURATION:
+ usb_core_set_config(pdev, req);
+ break;
+
+ case USB_REQ_GET_STATUS:
+ usb_core_get_status(pdev, req);
+ break;
+
+ case USB_REQ_SET_ADDRESS:
+ usb_core_set_address(pdev, req);
+ break;
+
+ case USB_REQ_GET_CONFIGURATION:
+ case USB_REQ_SET_FEATURE:
+ case USB_REQ_CLEAR_FEATURE:
+ default:
+ ERROR("NOT SUPPORTED %i\n", req->b_request);
+ usb_core_ctl_error(pdev);
+ break;
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_itf_req
+ * Handle standard usb interface requests
+ * pdev : device instance
+ * req : usb request
+ * return : status
+ */
+static enum usb_status usb_core_itf_req(struct usb_handle *pdev,
+ struct usb_setup_req *req)
+{
+ if (pdev->dev_state != USBD_STATE_CONFIGURED) {
+ usb_core_ctl_error(pdev);
+ return USBD_OK;
+ }
+
+ if (LOBYTE(req->index) <= USBD_MAX_NUM_INTERFACES) {
+ pdev->class->setup(pdev, req);
+
+ if (req->length == 0U) {
+ usb_core_transmit_ep0(pdev, NULL, 0U);
+ }
+ } else {
+ usb_core_ctl_error(pdev);
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_setup_stage
+ * Handle the setup stage
+ * pdev: device instance
+ * psetup : setup buffer
+ * return : status
+ */
+static enum usb_status usb_core_setup_stage(struct usb_handle *pdev,
+ uint8_t *psetup)
+{
+ struct usb_setup_req *req = &pdev->request;
+
+ /* Copy setup buffer into req structure */
+ req->bm_request = psetup[0];
+ req->b_request = psetup[1];
+ req->value = psetup[2] + (psetup[3] << 8);
+ req->index = psetup[4] + (psetup[5] << 8);
+ req->length = psetup[6] + (psetup[7] << 8);
+
+ pdev->ep0_state = USBD_EP0_SETUP;
+ pdev->ep0_data_len = pdev->request.length;
+
+ switch (pdev->request.bm_request & USB_REQ_RECIPIENT_MASK) {
+ case USB_REQ_RECIPIENT_DEVICE:
+ usb_core_dev_req(pdev, &pdev->request);
+ break;
+
+ case USB_REQ_RECIPIENT_INTERFACE:
+ usb_core_itf_req(pdev, &pdev->request);
+ break;
+
+ case USB_REQ_RECIPIENT_ENDPOINT:
+ default:
+ ERROR("receive unsupported request %i",
+ pdev->request.bm_request & USB_REQ_RECIPIENT_MASK);
+ usb_core_set_stall(pdev, pdev->request.bm_request & USB_REQ_DIRECTION);
+ return USBD_FAIL;
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_data_out
+ * Handle data OUT stage
+ * pdev: device instance
+ * epnum: endpoint index
+ * pdata: buffer to sent
+ * return : status
+ */
+static enum usb_status usb_core_data_out(struct usb_handle *pdev, uint8_t epnum,
+ uint8_t *pdata)
+{
+ struct usb_endpoint *pep;
+
+ if (epnum == 0U) {
+ pep = &pdev->ep_out[0];
+ if (pdev->ep0_state == USBD_EP0_DATA_OUT) {
+ if (pep->rem_length > pep->maxpacket) {
+ pep->rem_length -= pep->maxpacket;
+
+ usb_core_receive(pdev, 0U, pdata,
+ MIN(pep->rem_length,
+ pep->maxpacket));
+ } else {
+ if (pdev->class->ep0_rx_ready &&
+ (pdev->dev_state == USBD_STATE_CONFIGURED)) {
+ pdev->class->ep0_rx_ready(pdev);
+ }
+
+ usb_core_transmit_ep0(pdev, NULL, 0U);
+ }
+ }
+ } else if (pdev->class->data_out != NULL &&
+ (pdev->dev_state == USBD_STATE_CONFIGURED)) {
+ pdev->class->data_out(pdev, epnum);
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_data_in
+ * Handle data in stage
+ * pdev: device instance
+ * epnum: endpoint index
+ * pdata: buffer to fill
+ * return : status
+ */
+static enum usb_status usb_core_data_in(struct usb_handle *pdev, uint8_t epnum,
+ uint8_t *pdata)
+{
+ if (epnum == 0U) {
+ struct usb_endpoint *pep = &pdev->ep_in[0];
+
+ if (pdev->ep0_state == USBD_EP0_DATA_IN) {
+ if (pep->rem_length > pep->maxpacket) {
+ pep->rem_length -= pep->maxpacket;
+
+ usb_core_transmit(pdev, 0U, pdata,
+ pep->rem_length);
+
+ /* Prepare EP for premature end of transfer */
+ usb_core_receive(pdev, 0U, NULL, 0U);
+ } else {
+ /* Last packet is MPS multiple, send ZLP packet */
+ if ((pep->total_length % pep->maxpacket == 0U) &&
+ (pep->total_length >= pep->maxpacket) &&
+ (pep->total_length < pdev->ep0_data_len)) {
+ usb_core_transmit(pdev, 0U, NULL, 0U);
+
+ pdev->ep0_data_len = 0U;
+
+ /* Prepare endpoint for premature end of transfer */
+ usb_core_receive(pdev, 0U, NULL, 0U);
+ } else {
+ if (pdev->class->ep0_tx_sent != NULL &&
+ (pdev->dev_state ==
+ USBD_STATE_CONFIGURED)) {
+ pdev->class->ep0_tx_sent(pdev);
+ }
+ /* Start the transfer */
+ usb_core_receive_ep0(pdev, NULL, 0U);
+ }
+ }
+ }
+ } else if ((pdev->class->data_in != NULL) &&
+ (pdev->dev_state == USBD_STATE_CONFIGURED)) {
+ pdev->class->data_in(pdev, epnum);
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_suspend
+ * Handle suspend event
+ * pdev : device instance
+ * return : status
+ */
+static enum usb_status usb_core_suspend(struct usb_handle *pdev)
+{
+ INFO("USB Suspend mode\n");
+ pdev->dev_old_state = pdev->dev_state;
+ pdev->dev_state = USBD_STATE_SUSPENDED;
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_resume
+ * Handle resume event
+ * pdev : device instance
+ * return : status
+ */
+static enum usb_status usb_core_resume(struct usb_handle *pdev)
+{
+ INFO("USB Resume\n");
+ pdev->dev_state = pdev->dev_old_state;
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_sof
+ * Handle SOF event
+ * pdev : device instance
+ * return : status
+ */
+static enum usb_status usb_core_sof(struct usb_handle *pdev)
+{
+ if (pdev->dev_state == USBD_STATE_CONFIGURED) {
+ if (pdev->class->sof != NULL) {
+ pdev->class->sof(pdev);
+ }
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_disconnect
+ * Handle device disconnection event
+ * pdev : device instance
+ * return : status
+ */
+static enum usb_status usb_core_disconnect(struct usb_handle *pdev)
+{
+ /* Free class resources */
+ pdev->dev_state = USBD_STATE_DEFAULT;
+ pdev->class->de_init(pdev, pdev->dev_config);
+
+ return USBD_OK;
+}
+
+enum usb_status usb_core_handle_it(struct usb_handle *pdev)
+{
+ uint32_t param = 0U;
+ uint32_t len = 0U;
+ struct usbd_ep *ep;
+
+ switch (pdev->driver->it_handler(pdev->data->instance, ¶m)) {
+ case USB_DATA_OUT:
+ usb_core_data_out(pdev, param,
+ pdev->data->out_ep[param].xfer_buff);
+ break;
+
+ case USB_DATA_IN:
+ usb_core_data_in(pdev, param,
+ pdev->data->in_ep[param].xfer_buff);
+ break;
+
+ case USB_SETUP:
+ usb_core_setup_stage(pdev, (uint8_t *)pdev->data->setup);
+ break;
+
+ case USB_ENUM_DONE:
+ break;
+
+ case USB_READ_DATA_PACKET:
+ ep = &pdev->data->out_ep[param & USBD_OUT_EPNUM_MASK];
+ len = (param & USBD_OUT_COUNT_MASK) >> USBD_OUT_COUNT_SHIFT;
+ pdev->driver->read_packet(pdev->data->instance,
+ ep->xfer_buff, len);
+ ep->xfer_buff += len;
+ ep->xfer_count += len;
+ break;
+
+ case USB_READ_SETUP_PACKET:
+ ep = &pdev->data->out_ep[param & USBD_OUT_EPNUM_MASK];
+ len = (param & USBD_OUT_COUNT_MASK) >> 0x10;
+ pdev->driver->read_packet(pdev->data->instance,
+ (uint8_t *)pdev->data->setup, 8);
+ ep->xfer_count += len;
+ break;
+
+ case USB_RESET:
+ pdev->dev_state = USBD_STATE_DEFAULT;
+ break;
+
+ case USB_RESUME:
+ if (pdev->data->lpm_state == LPM_L1) {
+ pdev->data->lpm_state = LPM_L0;
+ } else {
+ usb_core_resume(pdev);
+ }
+ break;
+
+ case USB_SUSPEND:
+ usb_core_suspend(pdev);
+ break;
+
+ case USB_LPM:
+ if (pdev->data->lpm_state == LPM_L0) {
+ pdev->data->lpm_state = LPM_L1;
+ } else {
+ usb_core_suspend(pdev);
+ }
+ break;
+
+ case USB_SOF:
+ usb_core_sof(pdev);
+ break;
+
+ case USB_DISCONNECT:
+ usb_core_disconnect(pdev);
+ break;
+
+ case USB_WRITE_EMPTY:
+ pdev->driver->write_empty_tx_fifo(pdev->data->instance, param,
+ pdev->data->in_ep[param].xfer_len,
+ (uint32_t *)&pdev->data->in_ep[param].xfer_count,
+ pdev->data->in_ep[param].maxpacket,
+ &pdev->data->in_ep[param].xfer_buff);
+ break;
+
+ case USB_NOTHING:
+ default:
+ break;
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_receive
+ * Receive an amount of data
+ * pdev: USB handle
+ * ep_addr: endpoint address
+ * buf: pointer to the reception buffer
+ * len: amount of data to be received
+ * return : status
+ */
+enum usb_status usb_core_receive(struct usb_handle *pdev, uint8_t ep_addr,
+ uint8_t *buf, uint32_t len)
+{
+ struct usbd_ep *ep;
+ struct pcd_handle *hpcd = (struct pcd_handle *)pdev->data;
+ uint8_t num;
+
+ num = ep_addr & EP_NUM_MASK;
+ if (num >= USBD_EP_NB) {
+ return USBD_FAIL;
+ }
+ ep = &hpcd->out_ep[num];
+
+ /* Setup and start the Xfer */
+ ep->xfer_buff = buf;
+ ep->xfer_len = len;
+ ep->xfer_count = 0U;
+ ep->is_in = false;
+ ep->num = num;
+
+ if (num == 0U) {
+ pdev->driver->ep0_start_xfer(hpcd->instance, ep);
+ } else {
+ pdev->driver->ep_start_xfer(hpcd->instance, ep);
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_transmit
+ * Send an amount of data
+ * pdev: USB handle
+ * ep_addr: endpoint address
+ * buf: pointer to the transmission buffer
+ * len: amount of data to be sent
+ * return : status
+ */
+enum usb_status usb_core_transmit(struct usb_handle *pdev, uint8_t ep_addr,
+ uint8_t *buf, uint32_t len)
+{
+ struct usbd_ep *ep;
+ struct pcd_handle *hpcd = (struct pcd_handle *)pdev->data;
+ uint8_t num;
+
+ num = ep_addr & EP_NUM_MASK;
+ if (num >= USBD_EP_NB) {
+ return USBD_FAIL;
+ }
+ ep = &hpcd->in_ep[num];
+
+ /* Setup and start the Xfer */
+ ep->xfer_buff = buf;
+ ep->xfer_len = len;
+ ep->xfer_count = 0U;
+ ep->is_in = true;
+ ep->num = num;
+
+ if (num == 0U) {
+ pdev->driver->ep0_start_xfer(hpcd->instance, ep);
+ } else {
+ pdev->driver->ep_start_xfer(hpcd->instance, ep);
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_receive_ep0
+ * Receive an amount of data on ep0
+ * pdev: USB handle
+ * buf: pointer to the reception buffer
+ * len: amount of data to be received
+ * return : status
+ */
+enum usb_status usb_core_receive_ep0(struct usb_handle *pdev, uint8_t *buf,
+ uint32_t len)
+{
+ /* Prepare the reception of the buffer over EP0 */
+ if (len != 0U) {
+ pdev->ep0_state = USBD_EP0_DATA_OUT;
+ } else {
+ pdev->ep0_state = USBD_EP0_STATUS_OUT;
+ }
+
+ pdev->ep_out[0].total_length = len;
+ pdev->ep_out[0].rem_length = len;
+
+ /* Start the transfer */
+ return usb_core_receive(pdev, 0U, buf, len);
+}
+
+/*
+ * usb_core_transmit_ep0
+ * Send an amount of data on ep0
+ * pdev: USB handle
+ * buf: pointer to the transmission buffer
+ * len: amount of data to be sent
+ * return : status
+ */
+enum usb_status usb_core_transmit_ep0(struct usb_handle *pdev, uint8_t *buf,
+ uint32_t len)
+{
+ /* Set EP0 State */
+ if (len != 0U) {
+ pdev->ep0_state = USBD_EP0_DATA_IN;
+ } else {
+ pdev->ep0_state = USBD_EP0_STATUS_IN;
+ }
+
+ pdev->ep_in[0].total_length = len;
+ pdev->ep_in[0].rem_length = len;
+
+ /* Start the transfer */
+ return usb_core_transmit(pdev, 0U, buf, len);
+}
+
+/*
+ * usb_core_ctl_error
+ * Handle USB low level error
+ * pdev: device instance
+ * req: usb request
+ * return : None
+ */
+
+void usb_core_ctl_error(struct usb_handle *pdev)
+{
+ ERROR("%s : Send an ERROR\n", __func__);
+ usb_core_set_stall(pdev, EP0_IN);
+ usb_core_set_stall(pdev, EP0_OUT);
+}
+
+/*
+ * usb_core_start
+ * Start the USB device core.
+ * pdev: Device Handle
+ * return : USBD Status
+ */
+enum usb_status usb_core_start(struct usb_handle *pdev)
+{
+ /* Start the low level driver */
+ pdev->driver->start_device(pdev->data->instance);
+
+ return USBD_OK;
+}
+
+/*
+ * usb_core_stop
+ * Stop the USB device core.
+ * pdev: Device Handle
+ * return : USBD Status
+ */
+enum usb_status usb_core_stop(struct usb_handle *pdev)
+{
+ /* Free class resources */
+ pdev->class->de_init(pdev, pdev->dev_config);
+
+ /* Stop the low level driver */
+ pdev->driver->stop_device(pdev->data->instance);
+
+ return USBD_OK;
+}
+
+/*
+ * register_usb_driver
+ * Stop the USB device core.
+ * pdev: Device Handle
+ * pcd_handle: PCD handle
+ * driver: USB driver
+ * driver_handle: USB driver handle
+ * return : USBD Status
+ */
+enum usb_status register_usb_driver(struct usb_handle *pdev,
+ struct pcd_handle *pcd_handle,
+ const struct usb_driver *driver,
+ void *driver_handle)
+{
+ uint8_t i;
+
+ assert(pdev != NULL);
+ assert(pcd_handle != NULL);
+ assert(driver != NULL);
+ assert(driver_handle != NULL);
+
+ /* Free class resources */
+ pdev->driver = driver;
+ pdev->data = pcd_handle;
+ pdev->data->instance = driver_handle;
+ pdev->dev_state = USBD_STATE_DEFAULT;
+ pdev->ep0_state = USBD_EP0_IDLE;
+
+ /* Copy endpoint information */
+ for (i = 0U; i < USBD_EP_NB; i++) {
+ pdev->ep_in[i].maxpacket = pdev->data->in_ep[i].maxpacket;
+ pdev->ep_out[i].maxpacket = pdev->data->out_ep[i].maxpacket;
+ }
+
+ return USBD_OK;
+}
+
+/*
+ * register_platform
+ * Register the USB device core.
+ * pdev: Device Handle
+ * plat_call_back: callback
+ * return : USBD Status
+ */
+enum usb_status register_platform(struct usb_handle *pdev,
+ const struct usb_desc *plat_call_back)
+{
+ assert(pdev != NULL);
+ assert(plat_call_back != NULL);
+
+ /* Save platform info in class resources */
+ pdev->desc = plat_call_back;
+
+ return USBD_OK;
+}
diff --git a/include/drivers/usb_device.h b/include/drivers/usb_device.h
new file mode 100644
index 0000000..e21e315
--- /dev/null
+++ b/include/drivers/usb_device.h
@@ -0,0 +1,276 @@
+/*
+ * Copyright (c) 2021, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef USB_DEVICE_H
+#define USB_DEVICE_H
+
+#include <stdint.h>
+
+#include <lib/utils_def.h>
+
+#define USBD_MAX_NUM_INTERFACES 1U
+#define USBD_MAX_NUM_CONFIGURATION 1U
+
+#define USB_LEN_DEV_QUALIFIER_DESC 0x0AU
+#define USB_LEN_DEV_DESC 0x12U
+#define USB_LEN_CFG_DESC 0x09U
+#define USB_LEN_IF_DESC 0x09U
+#define USB_LEN_EP_DESC 0x07U
+#define USB_LEN_OTG_DESC 0x03U
+#define USB_LEN_LANGID_STR_DESC 0x04U
+#define USB_LEN_OTHER_SPEED_DESC_SIZ 0x09U
+
+#define USBD_IDX_LANGID_STR 0x00U
+#define USBD_IDX_MFC_STR 0x01U
+#define USBD_IDX_PRODUCT_STR 0x02U
+#define USBD_IDX_SERIAL_STR 0x03U
+#define USBD_IDX_CONFIG_STR 0x04U
+#define USBD_IDX_INTERFACE_STR 0x05U
+#define USBD_IDX_USER0_STR 0x06U
+
+#define USB_REQ_TYPE_STANDARD 0x00U
+#define USB_REQ_TYPE_CLASS 0x20U
+#define USB_REQ_TYPE_VENDOR 0x40U
+#define USB_REQ_TYPE_MASK 0x60U
+
+#define USB_REQ_RECIPIENT_DEVICE 0x00U
+#define USB_REQ_RECIPIENT_INTERFACE 0x01U
+#define USB_REQ_RECIPIENT_ENDPOINT 0x02U
+#define USB_REQ_RECIPIENT_MASK 0x1FU
+
+#define USB_REQ_DIRECTION 0x80U
+
+#define USB_REQ_GET_STATUS 0x00U
+#define USB_REQ_CLEAR_FEATURE 0x01U
+#define USB_REQ_SET_FEATURE 0x03U
+#define USB_REQ_SET_ADDRESS 0x05U
+#define USB_REQ_GET_DESCRIPTOR 0x06U
+#define USB_REQ_SET_DESCRIPTOR 0x07U
+#define USB_REQ_GET_CONFIGURATION 0x08U
+#define USB_REQ_SET_CONFIGURATION 0x09U
+#define USB_REQ_GET_INTERFACE 0x0AU
+#define USB_REQ_SET_INTERFACE 0x0BU
+#define USB_REQ_SYNCH_FRAME 0x0CU
+
+#define USB_DESC_TYPE_DEVICE 0x01U
+#define USB_DESC_TYPE_CONFIGURATION 0x02U
+#define USB_DESC_TYPE_STRING 0x03U
+#define USB_DESC_TYPE_INTERFACE 0x04U
+#define USB_DESC_TYPE_ENDPOINT 0x05U
+#define USB_DESC_TYPE_DEVICE_QUALIFIER 0x06U
+#define USB_DESC_TYPE_OTHER_SPEED_CONFIGURATION 0x07U
+#define USB_DESC_TYPE_BOS 0x0FU
+
+#define USB_CONFIG_REMOTE_WAKEUP 2U
+#define USB_CONFIG_SELF_POWERED 1U
+
+#define USB_MAX_EP0_SIZE 64U
+
+/* Device Status */
+#define USBD_STATE_DEFAULT 1U
+#define USBD_STATE_ADDRESSED 2U
+#define USBD_STATE_CONFIGURED 3U
+#define USBD_STATE_SUSPENDED 4U
+
+/* EP0 State */
+#define USBD_EP0_IDLE 0U
+#define USBD_EP0_SETUP 1U
+#define USBD_EP0_DATA_IN 2U
+#define USBD_EP0_DATA_OUT 3U
+#define USBD_EP0_STATUS_IN 4U
+#define USBD_EP0_STATUS_OUT 5U
+#define USBD_EP0_STALL 6U
+
+#define USBD_EP_TYPE_CTRL 0U
+#define USBD_EP_TYPE_ISOC 1U
+#define USBD_EP_TYPE_BULK 2U
+#define USBD_EP_TYPE_INTR 3U
+
+#define USBD_OUT_EPNUM_MASK GENMASK(15, 0)
+#define USBD_OUT_COUNT_MASK GENMASK(31, 16)
+#define USBD_OUT_COUNT_SHIFT 16U
+
+/* Number of EP supported, allow to reduce footprint: default max = 15 */
+#ifndef CONFIG_USBD_EP_NB
+#define USBD_EP_NB 15U
+#else
+#define USBD_EP_NB CONFIG_USBD_EP_NB
+#endif
+
+#define LOBYTE(x) ((uint8_t)((x) & 0x00FF))
+#define HIBYTE(x) ((uint8_t)(((x) & 0xFF00) >> 8))
+
+struct usb_setup_req {
+ uint8_t bm_request;
+ uint8_t b_request;
+ uint16_t value;
+ uint16_t index;
+ uint16_t length;
+};
+
+struct usb_handle;
+
+struct usb_class {
+ uint8_t (*init)(struct usb_handle *pdev, uint8_t cfgidx);
+ uint8_t (*de_init)(struct usb_handle *pdev, uint8_t cfgidx);
+ /* Control Endpoints */
+ uint8_t (*setup)(struct usb_handle *pdev, struct usb_setup_req *req);
+ uint8_t (*ep0_tx_sent)(struct usb_handle *pdev);
+ uint8_t (*ep0_rx_ready)(struct usb_handle *pdev);
+ /* Class Specific Endpoints */
+ uint8_t (*data_in)(struct usb_handle *pdev, uint8_t epnum);
+ uint8_t (*data_out)(struct usb_handle *pdev, uint8_t epnum);
+ uint8_t (*sof)(struct usb_handle *pdev);
+ uint8_t (*iso_in_incomplete)(struct usb_handle *pdev, uint8_t epnum);
+ uint8_t (*iso_out_incomplete)(struct usb_handle *pdev, uint8_t epnum);
+};
+
+/* Following USB Device status */
+enum usb_status {
+ USBD_OK = 0U,
+ USBD_BUSY,
+ USBD_FAIL,
+ USBD_TIMEOUT
+};
+
+/* Action to do after IT handling */
+enum usb_action {
+ USB_NOTHING = 0U,
+ USB_DATA_OUT,
+ USB_DATA_IN,
+ USB_SETUP,
+ USB_ENUM_DONE,
+ USB_READ_DATA_PACKET,
+ USB_READ_SETUP_PACKET,
+ USB_RESET,
+ USB_RESUME,
+ USB_SUSPEND,
+ USB_LPM,
+ USB_SOF,
+ USB_DISCONNECT,
+ USB_WRITE_EMPTY
+};
+
+/* USB Device descriptors structure */
+struct usb_desc {
+ uint8_t *(*get_device_desc)(uint16_t *length);
+ uint8_t *(*get_lang_id_desc)(uint16_t *length);
+ uint8_t *(*get_manufacturer_desc)(uint16_t *length);
+ uint8_t *(*get_product_desc)(uint16_t *length);
+ uint8_t *(*get_serial_desc)(uint16_t *length);
+ uint8_t *(*get_configuration_desc)(uint16_t *length);
+ uint8_t *(*get_interface_desc)(uint16_t *length);
+ uint8_t *(*get_usr_desc)(uint8_t index, uint16_t *length);
+ uint8_t *(*get_config_desc)(uint16_t *length);
+ uint8_t *(*get_device_qualifier_desc)(uint16_t *length);
+};
+
+/* USB Device handle structure */
+struct usb_endpoint {
+ uint32_t status;
+ uint32_t total_length;
+ uint32_t rem_length;
+ uint32_t maxpacket;
+};
+
+/*
+ * EndPoint descriptor
+ * num : Endpoint number, between 0 and 15 (limited by USBD_EP_NB)
+ * is_in: Endpoint direction
+ * type : Endpoint type
+ * maxpacket: Endpoint Max packet size: between 0 and 64KB
+ * xfer_buff: Pointer to transfer buffer
+ * xfer_len: Current transfer lengt
+ * hxfer_count: Partial transfer length in case of multi packet transfer
+ */
+struct usbd_ep {
+ uint8_t num;
+ bool is_in;
+ uint8_t type;
+ uint32_t maxpacket;
+ uint8_t *xfer_buff;
+ uint32_t xfer_len;
+ uint32_t xfer_count;
+};
+
+enum pcd_lpm_state {
+ LPM_L0 = 0x00U, /* on */
+ LPM_L1 = 0x01U, /* LPM L1 sleep */
+ LPM_L2 = 0x02U, /* suspend */
+ LPM_L3 = 0x03U, /* off */
+};
+
+/* USB Device descriptors structure */
+struct usb_driver {
+ enum usb_status (*ep0_out_start)(void *handle);
+ enum usb_status (*ep_start_xfer)(void *handle, struct usbd_ep *ep);
+ enum usb_status (*ep0_start_xfer)(void *handle, struct usbd_ep *ep);
+ enum usb_status (*write_packet)(void *handle, uint8_t *src,
+ uint8_t ch_ep_num, uint16_t len);
+ void *(*read_packet)(void *handle, uint8_t *dest, uint16_t len);
+ enum usb_status (*ep_set_stall)(void *handle, struct usbd_ep *ep);
+ enum usb_status (*start_device)(void *handle);
+ enum usb_status (*stop_device)(void *handle);
+ enum usb_status (*set_address)(void *handle, uint8_t address);
+ enum usb_status (*write_empty_tx_fifo)(void *handle,
+ uint32_t epnum, uint32_t xfer_len,
+ uint32_t *xfer_count,
+ uint32_t maxpacket,
+ uint8_t **xfer_buff);
+ enum usb_action (*it_handler)(void *handle, uint32_t *param);
+};
+
+/* USB Peripheral Controller Drivers */
+struct pcd_handle {
+ void *instance; /* Register base address */
+ struct usbd_ep in_ep[USBD_EP_NB]; /* IN endpoint parameters */
+ struct usbd_ep out_ep[USBD_EP_NB]; /* OUT endpoint parameters */
+ uint32_t setup[12]; /* Setup packet buffer */
+ enum pcd_lpm_state lpm_state; /* LPM State */
+};
+
+/* USB Device handle structure */
+struct usb_handle {
+ uint8_t id;
+ uint32_t dev_config;
+ uint32_t dev_config_status;
+ struct usb_endpoint ep_in[USBD_EP_NB];
+ struct usb_endpoint ep_out[USBD_EP_NB];
+ uint32_t ep0_state;
+ uint32_t ep0_data_len;
+ uint8_t dev_state;
+ uint8_t dev_old_state;
+ uint8_t dev_address;
+ uint32_t dev_remote_wakeup;
+ struct usb_setup_req request;
+ const struct usb_desc *desc;
+ struct usb_class *class;
+ void *class_data;
+ void *user_data;
+ struct pcd_handle *data;
+ const struct usb_driver *driver;
+};
+
+enum usb_status usb_core_handle_it(struct usb_handle *pdev);
+enum usb_status usb_core_receive(struct usb_handle *pdev, uint8_t ep_addr,
+ uint8_t *p_buf, uint32_t len);
+enum usb_status usb_core_transmit(struct usb_handle *pdev, uint8_t ep_addr,
+ uint8_t *p_buf, uint32_t len);
+enum usb_status usb_core_receive_ep0(struct usb_handle *pdev, uint8_t *p_buf,
+ uint32_t len);
+enum usb_status usb_core_transmit_ep0(struct usb_handle *pdev, uint8_t *p_buf,
+ uint32_t len);
+void usb_core_ctl_error(struct usb_handle *pdev);
+enum usb_status usb_core_start(struct usb_handle *pdev);
+enum usb_status usb_core_stop(struct usb_handle *pdev);
+enum usb_status register_usb_driver(struct usb_handle *pdev,
+ struct pcd_handle *pcd_handle,
+ const struct usb_driver *driver,
+ void *driver_handle);
+enum usb_status register_platform(struct usb_handle *pdev,
+ const struct usb_desc *plat_call_back);
+
+#endif /* USB_DEVICE_H */