75500277f4cda0bcd65935960c3e7542b65b08ae
[openwrt-10.03/.git] / target / linux / ar71xx / files / drivers / net / ag71xx / ag71xx_phy.c
1 /*
2  *  Atheros AR71xx built-in ethernet mac driver
3  *
4  *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
5  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
6  *
7  *  Based on Atheros' AG7100 driver
8  *
9  *  This program is free software; you can redistribute it and/or modify it
10  *  under the terms of the GNU General Public License version 2 as published
11  *  by the Free Software Foundation.
12  */
13
14 #include "ag71xx.h"
15
16 static void ag71xx_phy_link_adjust(struct net_device *dev)
17 {
18         struct ag71xx *ag = netdev_priv(dev);
19         struct phy_device *phydev = ag->phy_dev;
20         unsigned long flags;
21         int status_change = 0;
22
23         spin_lock_irqsave(&ag->lock, flags);
24
25         if (phydev->link) {
26                 if (ag->duplex != phydev->duplex
27                     || ag->speed != phydev->speed) {
28                         status_change = 1;
29                 }
30         }
31
32         if (phydev->link != ag->link)
33                 status_change = 1;
34
35         ag->link = phydev->link;
36         ag->duplex = phydev->duplex;
37         ag->speed = phydev->speed;
38
39         if (status_change)
40                 ag71xx_link_adjust(ag);
41
42         spin_unlock_irqrestore(&ag->lock, flags);
43 }
44
45 void ag71xx_phy_start(struct ag71xx *ag)
46 {
47         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
48
49         if (ag->phy_dev) {
50                 phy_start(ag->phy_dev);
51         } else if (pdata->has_ar7240_switch) {
52                 ag71xx_ar7240_start(ag);
53         } else {
54                 ag->link = 1;
55                 ag71xx_link_adjust(ag);
56         }
57 }
58
59 void ag71xx_phy_stop(struct ag71xx *ag)
60 {
61         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
62
63         if (ag->phy_dev) {
64                 phy_stop(ag->phy_dev);
65         } else {
66                 if (pdata->has_ar7240_switch)
67                         ag71xx_ar7240_stop(ag);
68                 ag->link = 0;
69                 ag71xx_link_adjust(ag);
70         }
71 }
72
73 static int ag71xx_phy_connect_fixed(struct ag71xx *ag)
74 {
75         struct net_device *dev = ag->dev;
76         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
77         int ret = 0;
78
79         /* use fixed settings */
80         switch (pdata->speed) {
81         case SPEED_10:
82         case SPEED_100:
83         case SPEED_1000:
84                 break;
85         default:
86                 printk(KERN_ERR "%s: invalid speed specified\n", dev->name);
87                 ret = -EINVAL;
88                 break;
89         }
90
91         printk(KERN_DEBUG "%s: using fixed link parameters\n", dev->name);
92
93         ag->duplex = pdata->duplex;
94         ag->speed = pdata->speed;
95
96         return ret;
97 }
98
99 static int ag71xx_phy_connect_multi(struct ag71xx *ag)
100 {
101         struct net_device *dev = ag->dev;
102         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
103         struct phy_device *phydev = NULL;
104         int phy_addr;
105         int ret = 0;
106
107         for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
108                 if (!(pdata->phy_mask & (1 << phy_addr)))
109                         continue;
110
111                 if (ag->mii_bus->phy_map[phy_addr] == NULL)
112                         continue;
113
114                 DBG("%s: PHY found at %s, uid=%08x\n",
115                         dev->name,
116                         dev_name(&ag->mii_bus->phy_map[phy_addr]->dev),
117                         ag->mii_bus->phy_map[phy_addr]->phy_id);
118
119                 if (phydev == NULL)
120                         phydev = ag->mii_bus->phy_map[phy_addr];
121         }
122
123         if (!phydev) {
124                 printk(KERN_ERR "%s: no PHY found with phy_mask=%08x\n",
125                         dev->name, pdata->phy_mask);
126                 return -ENODEV;
127         }
128
129         ag->phy_dev = phy_connect(dev, dev_name(&phydev->dev),
130                                   &ag71xx_phy_link_adjust, 0,
131                                   pdata->phy_if_mode);
132
133         if (IS_ERR(ag->phy_dev)) {
134                 printk(KERN_ERR "%s: could not connect to PHY at %s\n",
135                         dev->name, dev_name(&phydev->dev));
136                 return PTR_ERR(ag->phy_dev);
137         }
138
139         /* mask with MAC supported features */
140         if (pdata->has_gbit)
141                 phydev->supported &= PHY_GBIT_FEATURES;
142         else
143                 phydev->supported &= PHY_BASIC_FEATURES;
144
145         phydev->advertising = phydev->supported;
146
147         printk(KERN_DEBUG "%s: connected to PHY at %s [uid=%08x, driver=%s]\n",
148                 dev->name, dev_name(&phydev->dev),
149                 phydev->phy_id, phydev->drv->name);
150
151         ag->link = 0;
152         ag->speed = 0;
153         ag->duplex = -1;
154
155         return ret;
156 }
157
158 static int dev_is_class(struct device *dev, void *class)
159 {
160         if (dev->class != NULL && !strcmp(dev->class->name, class))
161                 return 1;
162
163         return 0;
164 }
165
166 static struct device *dev_find_class(struct device *parent, char *class)
167 {
168         if (dev_is_class(parent, class)) {
169                 get_device(parent);
170                 return parent;
171         }
172
173         return device_find_child(parent, class, dev_is_class);
174 }
175
176 static struct mii_bus *dev_to_mii_bus(struct device *dev)
177 {
178         struct device *d;
179
180         d = dev_find_class(dev, "mdio_bus");
181         if (d != NULL) {
182                 struct mii_bus *bus;
183
184                 bus = to_mii_bus(d);
185                 put_device(d);
186
187                 return bus;
188         }
189
190         return NULL;
191 }
192
193 int __devinit ag71xx_phy_connect(struct ag71xx *ag)
194 {
195         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
196
197         ag->mii_bus = dev_to_mii_bus(pdata->mii_bus_dev);
198         if (ag->mii_bus == NULL) {
199                 printk(KERN_ERR "%s: unable to find MII bus on device '%s'\n",
200                         ag->dev->name, dev_name(pdata->mii_bus_dev));
201                 return -ENODEV;
202         }
203
204         /* Reset the mdio bus explicitly */
205         if (ag->mii_bus->reset) {
206                 mutex_lock(&ag->mii_bus->mdio_lock);
207                 ag->mii_bus->reset(ag->mii_bus);
208                 mutex_unlock(&ag->mii_bus->mdio_lock);
209         }
210
211         if (pdata->has_ar7240_switch)
212                 return ag71xx_ar7240_init(ag);
213
214         if (pdata->phy_mask)
215                 return ag71xx_phy_connect_multi(ag);
216
217         return ag71xx_phy_connect_fixed(ag);
218 }
219
220 void ag71xx_phy_disconnect(struct ag71xx *ag)
221 {
222         struct ag71xx_platform_data *pdata = ag71xx_get_pdata(ag);
223
224         if (pdata->has_ar7240_switch)
225                 ag71xx_ar7240_cleanup(ag);
226         else if (ag->phy_dev)
227                 phy_disconnect(ag->phy_dev);
228 }