Commit | Line | Data |
---|---|---|
a2443fd1 | 1 | // SPDX-License-Identifier: GPL-2.0+ |
a9049e0c AL |
2 | /* Framework for MDIO devices, other than PHYs. |
3 | * | |
4 | * Copyright (c) 2016 Andrew Lunn <andrew@lunn.ch> | |
a9049e0c AL |
5 | */ |
6 | ||
7 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
8 | ||
1d0018a4 | 9 | #include <linux/delay.h> |
a9049e0c | 10 | #include <linux/errno.h> |
bafbdd52 SS |
11 | #include <linux/gpio.h> |
12 | #include <linux/gpio/consumer.h> | |
a9049e0c AL |
13 | #include <linux/init.h> |
14 | #include <linux/interrupt.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/mdio.h> | |
17 | #include <linux/mii.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/phy.h> | |
71dd6c0d | 20 | #include <linux/reset.h> |
a9049e0c AL |
21 | #include <linux/slab.h> |
22 | #include <linux/string.h> | |
23 | #include <linux/unistd.h> | |
cb376176 | 24 | #include <linux/property.h> |
a9049e0c AL |
25 | |
26 | void mdio_device_free(struct mdio_device *mdiodev) | |
27 | { | |
28 | put_device(&mdiodev->dev); | |
29 | } | |
30 | EXPORT_SYMBOL(mdio_device_free); | |
31 | ||
32 | static void mdio_device_release(struct device *dev) | |
33 | { | |
cb376176 | 34 | fwnode_handle_put(dev->fwnode); |
a9049e0c AL |
35 | kfree(to_mdio_device(dev)); |
36 | } | |
37 | ||
648ea013 FF |
38 | int mdio_device_bus_match(struct device *dev, struct device_driver *drv) |
39 | { | |
40 | struct mdio_device *mdiodev = to_mdio_device(dev); | |
41 | struct mdio_driver *mdiodrv = to_mdio_driver(drv); | |
42 | ||
43 | if (mdiodrv->mdiodrv.flags & MDIO_DEVICE_IS_PHY) | |
44 | return 0; | |
45 | ||
46 | return strcmp(mdiodev->modalias, drv->name) == 0; | |
47 | } | |
48 | ||
a9049e0c AL |
49 | struct mdio_device *mdio_device_create(struct mii_bus *bus, int addr) |
50 | { | |
51 | struct mdio_device *mdiodev; | |
52 | ||
53 | /* We allocate the device, and initialize the default values */ | |
54 | mdiodev = kzalloc(sizeof(*mdiodev), GFP_KERNEL); | |
55 | if (!mdiodev) | |
56 | return ERR_PTR(-ENOMEM); | |
57 | ||
58 | mdiodev->dev.release = mdio_device_release; | |
59 | mdiodev->dev.parent = &bus->dev; | |
60 | mdiodev->dev.bus = &mdio_bus_type; | |
711fdba3 AL |
61 | mdiodev->device_free = mdio_device_free; |
62 | mdiodev->device_remove = mdio_device_remove; | |
a9049e0c AL |
63 | mdiodev->bus = bus; |
64 | mdiodev->addr = addr; | |
65 | ||
66 | dev_set_name(&mdiodev->dev, PHY_ID_FMT, bus->id, addr); | |
67 | ||
68 | device_initialize(&mdiodev->dev); | |
69 | ||
70 | return mdiodev; | |
71 | } | |
72 | EXPORT_SYMBOL(mdio_device_create); | |
73 | ||
74 | /** | |
75 | * mdio_device_register - Register the mdio device on the MDIO bus | |
76 | * @mdiodev: mdio_device structure to be added to the MDIO bus | |
77 | */ | |
78 | int mdio_device_register(struct mdio_device *mdiodev) | |
79 | { | |
80 | int err; | |
81 | ||
450bf1f0 | 82 | dev_dbg(&mdiodev->dev, "%s\n", __func__); |
a9049e0c AL |
83 | |
84 | err = mdiobus_register_device(mdiodev); | |
85 | if (err) | |
86 | return err; | |
87 | ||
88 | err = device_add(&mdiodev->dev); | |
89 | if (err) { | |
90 | pr_err("MDIO %d failed to add\n", mdiodev->addr); | |
91 | goto out; | |
92 | } | |
93 | ||
94 | return 0; | |
95 | ||
96 | out: | |
97 | mdiobus_unregister_device(mdiodev); | |
98 | return err; | |
99 | } | |
100 | EXPORT_SYMBOL(mdio_device_register); | |
101 | ||
102 | /** | |
103 | * mdio_device_remove - Remove a previously registered mdio device from the | |
104 | * MDIO bus | |
105 | * @mdiodev: mdio_device structure to remove | |
106 | * | |
107 | * This doesn't free the mdio_device itself, it merely reverses the effects | |
108 | * of mdio_device_register(). Use mdio_device_free() to free the device | |
109 | * after calling this function. | |
110 | */ | |
111 | void mdio_device_remove(struct mdio_device *mdiodev) | |
112 | { | |
113 | device_del(&mdiodev->dev); | |
114 | mdiobus_unregister_device(mdiodev); | |
115 | } | |
116 | EXPORT_SYMBOL(mdio_device_remove); | |
117 | ||
bafbdd52 SS |
118 | void mdio_device_reset(struct mdio_device *mdiodev, int value) |
119 | { | |
3a30ae6e RL |
120 | unsigned int d; |
121 | ||
6110ed2d | 122 | if (!mdiodev->reset_gpio && !mdiodev->reset_ctrl) |
3a30ae6e RL |
123 | return; |
124 | ||
6110ed2d | 125 | if (mdiodev->reset_gpio) |
ea977d19 | 126 | gpiod_set_value_cansleep(mdiodev->reset_gpio, value); |
71dd6c0d DB |
127 | |
128 | if (mdiodev->reset_ctrl) { | |
129 | if (value) | |
130 | reset_control_assert(mdiodev->reset_ctrl); | |
131 | else | |
132 | reset_control_deassert(mdiodev->reset_ctrl); | |
133 | } | |
3a30ae6e | 134 | |
04f629f7 | 135 | d = value ? mdiodev->reset_assert_delay : mdiodev->reset_deassert_delay; |
3a30ae6e | 136 | if (d) |
e4d5efdd | 137 | fsleep(d); |
bafbdd52 SS |
138 | } |
139 | EXPORT_SYMBOL(mdio_device_reset); | |
140 | ||
a9049e0c AL |
141 | /** |
142 | * mdio_probe - probe an MDIO device | |
143 | * @dev: device to probe | |
144 | * | |
145 | * Description: Take care of setting up the mdio_device structure | |
146 | * and calling the driver to probe the device. | |
147 | */ | |
148 | static int mdio_probe(struct device *dev) | |
149 | { | |
150 | struct mdio_device *mdiodev = to_mdio_device(dev); | |
151 | struct device_driver *drv = mdiodev->dev.driver; | |
152 | struct mdio_driver *mdiodrv = to_mdio_driver(drv); | |
153 | int err = 0; | |
154 | ||
96e26359 BG |
155 | /* Deassert the reset signal */ |
156 | mdio_device_reset(mdiodev, 0); | |
bafbdd52 | 157 | |
96e26359 | 158 | if (mdiodrv->probe) { |
a9049e0c | 159 | err = mdiodrv->probe(mdiodev); |
bafbdd52 SS |
160 | if (err) { |
161 | /* Assert the reset signal */ | |
162 | mdio_device_reset(mdiodev, 1); | |
163 | } | |
164 | } | |
a9049e0c AL |
165 | |
166 | return err; | |
167 | } | |
168 | ||
169 | static int mdio_remove(struct device *dev) | |
170 | { | |
171 | struct mdio_device *mdiodev = to_mdio_device(dev); | |
172 | struct device_driver *drv = mdiodev->dev.driver; | |
173 | struct mdio_driver *mdiodrv = to_mdio_driver(drv); | |
174 | ||
96e26359 | 175 | if (mdiodrv->remove) |
a9049e0c AL |
176 | mdiodrv->remove(mdiodev); |
177 | ||
96e26359 BG |
178 | /* Assert the reset signal */ |
179 | mdio_device_reset(mdiodev, 1); | |
bafbdd52 | 180 | |
a9049e0c AL |
181 | return 0; |
182 | } | |
183 | ||
cf957997 VO |
184 | static void mdio_shutdown(struct device *dev) |
185 | { | |
186 | struct mdio_device *mdiodev = to_mdio_device(dev); | |
187 | struct device_driver *drv = mdiodev->dev.driver; | |
188 | struct mdio_driver *mdiodrv = to_mdio_driver(drv); | |
189 | ||
190 | if (mdiodrv->shutdown) | |
191 | mdiodrv->shutdown(mdiodev); | |
192 | } | |
193 | ||
a9049e0c AL |
194 | /** |
195 | * mdio_driver_register - register an mdio_driver with the MDIO layer | |
19c5a5fe | 196 | * @drv: new mdio_driver to register |
a9049e0c AL |
197 | */ |
198 | int mdio_driver_register(struct mdio_driver *drv) | |
199 | { | |
200 | struct mdio_driver_common *mdiodrv = &drv->mdiodrv; | |
201 | int retval; | |
202 | ||
450bf1f0 | 203 | pr_debug("%s: %s\n", __func__, mdiodrv->driver.name); |
a9049e0c AL |
204 | |
205 | mdiodrv->driver.bus = &mdio_bus_type; | |
206 | mdiodrv->driver.probe = mdio_probe; | |
207 | mdiodrv->driver.remove = mdio_remove; | |
cf957997 | 208 | mdiodrv->driver.shutdown = mdio_shutdown; |
a9049e0c AL |
209 | |
210 | retval = driver_register(&mdiodrv->driver); | |
211 | if (retval) { | |
212 | pr_err("%s: Error %d in registering driver\n", | |
213 | mdiodrv->driver.name, retval); | |
214 | ||
215 | return retval; | |
216 | } | |
217 | ||
218 | return 0; | |
219 | } | |
220 | EXPORT_SYMBOL(mdio_driver_register); | |
221 | ||
222 | void mdio_driver_unregister(struct mdio_driver *drv) | |
223 | { | |
224 | struct mdio_driver_common *mdiodrv = &drv->mdiodrv; | |
225 | ||
226 | driver_unregister(&mdiodrv->driver); | |
227 | } | |
228 | EXPORT_SYMBOL(mdio_driver_unregister); |