1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2011 The Chromium OS Authors.
13 #include <asm/cache.h>
14 #include <dm/device-internal.h>
16 #include "usb_ether.h"
18 #define USB_BULK_RECV_TIMEOUT 500
20 int usb_ether_register(struct udevice *dev, struct ueth_data *ueth, int rxsize)
22 struct usb_device *udev = dev_get_parent_priv(dev);
23 struct usb_interface_descriptor *iface_desc;
24 bool ep_in_found = false, ep_out_found = false;
25 struct usb_interface *iface;
26 const int ifnum = 0; /* Always use interface 0 */
29 iface = &udev->config.if_desc[ifnum];
30 iface_desc = &udev->config.if_desc[ifnum].desc;
32 /* Initialize the ueth_data structure with some useful info */
34 ueth->subclass = iface_desc->bInterfaceSubClass;
35 ueth->protocol = iface_desc->bInterfaceProtocol;
38 * We are expecting a minimum of 3 endpoints - in, out (bulk), and int.
39 * We will ignore any others.
41 for (i = 0; i < iface_desc->bNumEndpoints; i++) {
42 int ep_addr = iface->ep_desc[i].bEndpointAddress;
44 /* is it an BULK endpoint? */
45 if ((iface->ep_desc[i].bmAttributes &
46 USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_BULK) {
47 if (ep_addr & USB_DIR_IN && !ep_in_found) {
48 ueth->ep_in = ep_addr &
49 USB_ENDPOINT_NUMBER_MASK;
51 } else if (!(ep_addr & USB_DIR_IN) && !ep_out_found) {
52 ueth->ep_out = ep_addr &
53 USB_ENDPOINT_NUMBER_MASK;
58 /* is it an interrupt endpoint? */
59 if ((iface->ep_desc[i].bmAttributes &
60 USB_ENDPOINT_XFERTYPE_MASK) == USB_ENDPOINT_XFER_INT) {
61 ueth->ep_int = iface->ep_desc[i].bEndpointAddress &
62 USB_ENDPOINT_NUMBER_MASK;
63 ueth->irqinterval = iface->ep_desc[i].bInterval;
66 debug("Endpoints In %d Out %d Int %d\n", ueth->ep_in, ueth->ep_out,
69 /* Do some basic sanity checks, and bail if we find a problem */
70 if (!ueth->ep_in || !ueth->ep_out || !ueth->ep_int) {
71 debug("%s: %s: Cannot find endpoints\n", __func__, dev->name);
75 ueth->rxsize = rxsize;
76 ueth->rxbuf = memalign(ARCH_DMA_MINALIGN, rxsize);
80 ret = usb_set_interface(udev, iface_desc->bInterfaceNumber, ifnum);
82 debug("%s: %s: Cannot set interface: %d\n", __func__, dev->name,
86 ueth->pusb_dev = udev;
91 int usb_ether_deregister(struct ueth_data *ueth)
96 int usb_ether_receive(struct ueth_data *ueth, int rxsize)
101 if (rxsize > ueth->rxsize)
103 ret = usb_bulk_msg(ueth->pusb_dev,
104 usb_rcvbulkpipe(ueth->pusb_dev, ueth->ep_in),
105 ueth->rxbuf, rxsize, &actual_len,
106 USB_BULK_RECV_TIMEOUT);
107 debug("Rx: len = %u, actual = %u, err = %d\n", rxsize, actual_len, ret);
109 printf("Rx: failed to receive: %d\n", ret);
112 if (actual_len > rxsize) {
113 debug("Rx: received too many bytes %d\n", actual_len);
116 ueth->rxlen = actual_len;
119 return actual_len ? 0 : -EAGAIN;
122 void usb_ether_advance_rxbuf(struct ueth_data *ueth, int num_bytes)
124 ueth->rxptr += num_bytes;
125 if (num_bytes < 0 || ueth->rxptr >= ueth->rxlen)
129 int usb_ether_get_rx_bytes(struct ueth_data *ueth, uint8_t **ptrp)
134 *ptrp = &ueth->rxbuf[ueth->rxptr];
136 return ueth->rxlen - ueth->rxptr;