usb: net: introduce support for Moschip USB ethernet
[karo-tx-uboot.git] / drivers / usb / eth / usb_ether.c
1 /*
2  * Copyright (c) 2011 The Chromium OS Authors.
3  *
4  * SPDX-License-Identifier:     GPL-2.0+
5  */
6
7 #include <common.h>
8 #include <usb.h>
9
10 #include "usb_ether.h"
11
12 typedef void (*usb_eth_before_probe)(void);
13 typedef int (*usb_eth_probe)(struct usb_device *dev, unsigned int ifnum,
14                         struct ueth_data *ss);
15 typedef int (*usb_eth_get_info)(struct usb_device *dev, struct ueth_data *ss,
16                         struct eth_device *dev_desc);
17
18 struct usb_eth_prob_dev {
19         usb_eth_before_probe    before_probe; /* optional */
20         usb_eth_probe                   probe;
21         usb_eth_get_info                get_info;
22 };
23
24 /* driver functions go here, each bracketed by #ifdef CONFIG_USB_ETHER_xxx */
25 static const struct usb_eth_prob_dev prob_dev[] = {
26 #ifdef CONFIG_USB_ETHER_ASIX
27         {
28                 .before_probe = asix_eth_before_probe,
29                 .probe = asix_eth_probe,
30                 .get_info = asix_eth_get_info,
31         },
32 #endif
33 #ifdef CONFIG_USB_ETHER_MCS7830
34         {
35                 .before_probe = mcs7830_eth_before_probe,
36                 .probe = mcs7830_eth_probe,
37                 .get_info = mcs7830_eth_get_info,
38         },
39 #endif
40 #ifdef CONFIG_USB_ETHER_SMSC95XX
41         {
42                 .before_probe = smsc95xx_eth_before_probe,
43                 .probe = smsc95xx_eth_probe,
44                 .get_info = smsc95xx_eth_get_info,
45         },
46 #endif
47         { },            /* END */
48 };
49
50 static int usb_max_eth_dev; /* number of highest available usb eth device */
51 static struct ueth_data usb_eth[USB_MAX_ETH_DEV];
52
53 /*******************************************************************************
54  * tell if current ethernet device is a usb dongle
55  */
56 int is_eth_dev_on_usb_host(void)
57 {
58         int i;
59         struct eth_device *dev = eth_get_dev();
60
61         if (dev) {
62                 for (i = 0; i < usb_max_eth_dev; i++)
63                         if (&usb_eth[i].eth_dev == dev)
64                                 return 1;
65         }
66         return 0;
67 }
68
69 /*
70  * Given a USB device, ask each driver if it can support it, and attach it
71  * to the first driver that says 'yes'
72  */
73 static void probe_valid_drivers(struct usb_device *dev)
74 {
75         struct eth_device *eth;
76         int j;
77
78         for (j = 0; prob_dev[j].probe && prob_dev[j].get_info; j++) {
79                 if (!prob_dev[j].probe(dev, 0, &usb_eth[usb_max_eth_dev]))
80                         continue;
81                 /*
82                  * ok, it is a supported eth device. Get info and fill it in
83                  */
84                 eth = &usb_eth[usb_max_eth_dev].eth_dev;
85                 if (prob_dev[j].get_info(dev,
86                         &usb_eth[usb_max_eth_dev],
87                         eth)) {
88                         /* found proper driver */
89                         /* register with networking stack */
90                         usb_max_eth_dev++;
91
92                         /*
93                          * usb_max_eth_dev must be incremented prior to this
94                          * call since eth_current_changed (internally called)
95                          * relies on it
96                          */
97                         eth_register(eth);
98                         if (eth_write_hwaddr(eth, "usbeth",
99                                         usb_max_eth_dev - 1))
100                                 puts("Warning: failed to set MAC address\n");
101                         break;
102                         }
103                 }
104         }
105
106 /*******************************************************************************
107  * scan the usb and reports device info
108  * to the user if mode = 1
109  * returns current device or -1 if no
110  */
111 int usb_host_eth_scan(int mode)
112 {
113         int i, old_async;
114         struct usb_device *dev;
115
116
117         if (mode == 1)
118                 printf("       scanning usb for ethernet devices... ");
119
120         old_async = usb_disable_asynch(1); /* asynch transfer not allowed */
121
122         /* unregister a previously detected device */
123         for (i = 0; i < usb_max_eth_dev; i++)
124                 eth_unregister(&usb_eth[i].eth_dev);
125
126         memset(usb_eth, 0, sizeof(usb_eth));
127
128         for (i = 0; prob_dev[i].probe; i++) {
129                 if (prob_dev[i].before_probe)
130                         prob_dev[i].before_probe();
131         }
132
133         usb_max_eth_dev = 0;
134         for (i = 0; i < USB_MAX_DEVICE; i++) {
135                 dev = usb_get_dev_index(i); /* get device */
136                 debug("i=%d\n", i);
137                 if (dev == NULL)
138                         break; /* no more devices available */
139
140                 /* find valid usb_ether driver for this device, if any */
141                 probe_valid_drivers(dev);
142
143                 /* check limit */
144                 if (usb_max_eth_dev == USB_MAX_ETH_DEV) {
145                         printf("max USB Ethernet Device reached: %d stopping\n",
146                                 usb_max_eth_dev);
147                         break;
148                 }
149         } /* for */
150
151         usb_disable_asynch(old_async); /* restore asynch value */
152         printf("%d Ethernet Device(s) found\n", usb_max_eth_dev);
153         if (usb_max_eth_dev > 0)
154                 return 0;
155         return -1;
156 }