1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Copyright (c) 2011 The Chromium OS Authors.
4 */
5
6#include <common.h>
7#include <dm.h>
8#include <errno.h>
9#include <log.h>
10#include <malloc.h>
11#include <net.h>
12#include <usb.h>
13#include <asm/cache.h>
14#include <dm/device-internal.h>
15
16#include "usb_ether.h"
17
18#define USB_BULK_RECV_TIMEOUT 500
19
20int usb_ether_register(struct udevice *dev, struct ueth_data *ueth, int rxsize)
21{
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 */
27	int ret, i;
28
29	iface = &udev->config.if_desc[ifnum];
30	iface_desc = &udev->config.if_desc[ifnum].desc;
31
32	/* Initialize the ueth_data structure with some useful info */
33	ueth->ifnum = ifnum;
34	ueth->subclass = iface_desc->bInterfaceSubClass;
35	ueth->protocol = iface_desc->bInterfaceProtocol;
36
37	/*
38	 * We are expecting a minimum of 3 endpoints - in, out (bulk), and int.
39	 * We will ignore any others.
40	 */
41	for (i = 0; i < iface_desc->bNumEndpoints; i++) {
42		int ep_addr = iface->ep_desc[i].bEndpointAddress;
43
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;
50				ep_in_found = true;
51			} else if (!(ep_addr & USB_DIR_IN) && !ep_out_found) {
52				ueth->ep_out = ep_addr &
53					USB_ENDPOINT_NUMBER_MASK;
54				ep_out_found = true;
55			}
56		}
57
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;
64		}
65	}
66	debug("Endpoints In %d Out %d Int %d\n", ueth->ep_in, ueth->ep_out,
67	      ueth->ep_int);
68
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);
72		return -ENXIO;
73	}
74
75	ueth->rxsize = rxsize;
76	ueth->rxbuf = memalign(ARCH_DMA_MINALIGN, rxsize);
77	if (!ueth->rxbuf)
78		return -ENOMEM;
79
80	ret = usb_set_interface(udev, iface_desc->bInterfaceNumber, ifnum);
81	if (ret) {
82		debug("%s: %s: Cannot set interface: %d\n", __func__, dev->name,
83		      ret);
84		return ret;
85	}
86	ueth->pusb_dev = udev;
87
88	return 0;
89}
90
91int usb_ether_deregister(struct ueth_data *ueth)
92{
93	return 0;
94}
95
96int usb_ether_receive(struct ueth_data *ueth, int rxsize)
97{
98	int actual_len;
99	int ret;
100
101	if (rxsize > ueth->rxsize)
102		return -EINVAL;
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);
108	if (ret) {
109		printf("Rx: failed to receive: %d\n", ret);
110		return ret;
111	}
112	if (actual_len > rxsize) {
113		debug("Rx: received too many bytes %d\n", actual_len);
114		return -ENOSPC;
115	}
116	ueth->rxlen = actual_len;
117	ueth->rxptr = 0;
118
119	return actual_len ? 0 : -EAGAIN;
120}
121
122void usb_ether_advance_rxbuf(struct ueth_data *ueth, int num_bytes)
123{
124	ueth->rxptr += num_bytes;
125	if (num_bytes < 0 || ueth->rxptr >= ueth->rxlen)
126		ueth->rxlen = 0;
127}
128
129int usb_ether_get_rx_bytes(struct ueth_data *ueth, uint8_t **ptrp)
130{
131	if (!ueth->rxlen)
132		return 0;
133
134	*ptrp = &ueth->rxbuf[ueth->rxptr];
135
136	return ueth->rxlen - ueth->rxptr;
137}
138