1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2019
4 * Alex Marginean, NXP
5 */
6
7 #include <common.h>
8 #include <dm.h>
9 #include <log.h>
10 #include <malloc.h>
11 #include <miiphy.h>
12 #include <dm/device-internal.h>
13 #include <dm/device_compat.h>
14 #include <dm/of_extra.h>
15 #include <dm/uclass-internal.h>
16 #include <linux/compat.h>
17
dm_mdio_probe_devices(void)18 void dm_mdio_probe_devices(void)
19 {
20 struct udevice *it;
21 struct uclass *uc;
22
23 uclass_get(UCLASS_MDIO, &uc);
24 uclass_foreach_dev(it, uc) {
25 device_probe(it);
26 }
27 }
28
dm_mdio_post_bind(struct udevice * dev)29 static int dm_mdio_post_bind(struct udevice *dev)
30 {
31 const char *dt_name;
32
33 /* set a custom name for the MDIO device, if present in DT */
34 if (dev_has_ofnode(dev)) {
35 dt_name = dev_read_string(dev, "device-name");
36 if (dt_name) {
37 debug("renaming dev %s to %s\n", dev->name, dt_name);
38 device_set_name(dev, dt_name);
39 }
40 }
41
42 /*
43 * MDIO command doesn't like spaces in names, don't allow them to keep
44 * it happy
45 */
46 if (strchr(dev->name, ' ')) {
47 debug("\nError: MDIO device name \"%s\" has a space!\n",
48 dev->name);
49 return -EINVAL;
50 }
51
52 #if CONFIG_IS_ENABLED(OF_REAL)
53 return dm_scan_fdt_dev(dev);
54 #else
55 return 0;
56 #endif
57 }
58
dm_mdio_read(struct udevice * mdio_dev,int addr,int devad,int reg)59 int dm_mdio_read(struct udevice *mdio_dev, int addr, int devad, int reg)
60 {
61 struct mdio_ops *ops = mdio_get_ops(mdio_dev);
62
63 if (!ops->read)
64 return -ENOSYS;
65
66 return ops->read(mdio_dev, addr, devad, reg);
67 }
68
dm_mdio_write(struct udevice * mdio_dev,int addr,int devad,int reg,u16 val)69 int dm_mdio_write(struct udevice *mdio_dev, int addr, int devad, int reg,
70 u16 val)
71 {
72 struct mdio_ops *ops = mdio_get_ops(mdio_dev);
73
74 if (!ops->write)
75 return -ENOSYS;
76
77 return ops->write(mdio_dev, addr, devad, reg, val);
78 }
79
dm_mdio_reset(struct udevice * mdio_dev)80 int dm_mdio_reset(struct udevice *mdio_dev)
81 {
82 struct mdio_ops *ops = mdio_get_ops(mdio_dev);
83
84 if (!ops->reset)
85 return 0;
86
87 return ops->reset(mdio_dev);
88 }
89
90 /*
91 * Following read/write/reset functions are registered with legacy MII code.
92 * These are called for PHY operations by upper layers and we further call the
93 * DM MDIO driver functions.
94 */
mdio_read(struct mii_dev * mii_bus,int addr,int devad,int reg)95 static int mdio_read(struct mii_dev *mii_bus, int addr, int devad, int reg)
96 {
97 return dm_mdio_read(mii_bus->priv, addr, devad, reg);
98 }
99
mdio_write(struct mii_dev * mii_bus,int addr,int devad,int reg,u16 val)100 static int mdio_write(struct mii_dev *mii_bus, int addr, int devad, int reg,
101 u16 val)
102 {
103 return dm_mdio_write(mii_bus->priv, addr, devad, reg, val);
104 }
105
mdio_reset(struct mii_dev * mii_bus)106 static int mdio_reset(struct mii_dev *mii_bus)
107 {
108 return dm_mdio_reset(mii_bus->priv);
109 }
110
dm_mdio_post_probe(struct udevice * dev)111 static int dm_mdio_post_probe(struct udevice *dev)
112 {
113 struct mdio_perdev_priv *pdata = dev_get_uclass_priv(dev);
114
115 pdata->mii_bus = mdio_alloc();
116 pdata->mii_bus->read = mdio_read;
117 pdata->mii_bus->write = mdio_write;
118 pdata->mii_bus->reset = mdio_reset;
119 pdata->mii_bus->priv = dev;
120 strlcpy(pdata->mii_bus->name, dev->name, MDIO_NAME_LEN);
121
122 return mdio_register(pdata->mii_bus);
123 }
124
dm_mdio_pre_remove(struct udevice * dev)125 static int dm_mdio_pre_remove(struct udevice *dev)
126 {
127 struct mdio_perdev_priv *pdata = dev_get_uclass_priv(dev);
128
129 dm_mdio_reset(dev);
130 mdio_unregister(pdata->mii_bus);
131 mdio_free(pdata->mii_bus);
132
133 return 0;
134 }
135
dm_phy_find_by_ofnode(ofnode phynode)136 struct phy_device *dm_phy_find_by_ofnode(ofnode phynode)
137 {
138 struct mdio_perdev_priv *pdata;
139 struct udevice *mdiodev;
140 u32 phy_addr;
141
142 if (ofnode_read_u32(phynode, "reg", &phy_addr))
143 return NULL;
144
145 if (uclass_get_device_by_ofnode(UCLASS_MDIO,
146 ofnode_get_parent(phynode),
147 &mdiodev))
148 return NULL;
149
150 if (device_probe(mdiodev))
151 return NULL;
152
153 pdata = dev_get_uclass_priv(mdiodev);
154
155 return phy_find_by_mask(pdata->mii_bus, BIT(phy_addr));
156 }
157
dm_mdio_phy_connect(struct udevice * mdiodev,int phyaddr,struct udevice * ethdev,phy_interface_t interface)158 struct phy_device *dm_mdio_phy_connect(struct udevice *mdiodev, int phyaddr,
159 struct udevice *ethdev,
160 phy_interface_t interface)
161 {
162 struct mdio_perdev_priv *pdata = dev_get_uclass_priv(mdiodev);
163
164 if (device_probe(mdiodev))
165 return NULL;
166
167 return phy_connect(pdata->mii_bus, phyaddr, ethdev, interface);
168 }
169
dm_eth_connect_phy_handle(struct udevice * ethdev,phy_interface_t interface)170 static struct phy_device *dm_eth_connect_phy_handle(struct udevice *ethdev,
171 phy_interface_t interface)
172 {
173 u32 phy_addr;
174 struct udevice *mdiodev;
175 struct phy_device *phy;
176 ofnode phynode;
177
178 if (IS_ENABLED(CONFIG_PHY_FIXED) &&
179 ofnode_phy_is_fixed_link(dev_ofnode(ethdev), &phynode)) {
180 phy = phy_connect(NULL, 0, ethdev, interface);
181 goto out;
182 }
183
184 phynode = dev_get_phy_node(ethdev);
185 if (!ofnode_valid(phynode)) {
186 dev_dbg(ethdev, "can't find PHY node\n");
187 return NULL;
188 }
189
190 /*
191 * reading 'reg' directly should be fine. This is a PHY node, the
192 * address is always size 1 and requires no translation
193 */
194 if (ofnode_read_u32(phynode, "reg", &phy_addr)) {
195 dev_dbg(ethdev, "missing reg property in phy node\n");
196 return NULL;
197 }
198
199 if (uclass_get_device_by_ofnode(UCLASS_MDIO,
200 ofnode_get_parent(phynode),
201 &mdiodev)) {
202 dev_dbg(ethdev, "can't find MDIO bus for node %s\n",
203 ofnode_get_name(ofnode_get_parent(phynode)));
204 return NULL;
205 }
206
207 phy = dm_mdio_phy_connect(mdiodev, phy_addr, ethdev, interface);
208
209 out:
210 if (phy)
211 phy->node = phynode;
212
213 return phy;
214 }
215
216 /* Connect to a PHY linked in eth DT node */
dm_eth_phy_connect(struct udevice * ethdev)217 struct phy_device *dm_eth_phy_connect(struct udevice *ethdev)
218 {
219 phy_interface_t interface;
220 struct phy_device *phy;
221
222 if (!dev_has_ofnode(ethdev)) {
223 debug("%s: supplied eth dev has no DT node!\n", ethdev->name);
224 return NULL;
225 }
226
227 interface = dev_read_phy_mode(ethdev);
228 if (interface == PHY_INTERFACE_MODE_NA)
229 dev_dbg(ethdev, "can't find interface mode, default to NA\n");
230
231 phy = dm_eth_connect_phy_handle(ethdev, interface);
232
233 if (!phy)
234 return NULL;
235
236 phy->interface = interface;
237
238 return phy;
239 }
240
241 UCLASS_DRIVER(mdio) = {
242 .id = UCLASS_MDIO,
243 .name = "mdio",
244 .post_bind = dm_mdio_post_bind,
245 .post_probe = dm_mdio_post_probe,
246 .pre_remove = dm_mdio_pre_remove,
247 .per_device_auto = sizeof(struct mdio_perdev_priv),
248 };
249