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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 | ||
d69d8048 | 38 | int mdio_device_bus_match(struct device *dev, const struct device_driver *drv) |
648ea013 FF |
39 | { |
40 | struct mdio_device *mdiodev = to_mdio_device(dev); | |
d69d8048 | 41 | const struct mdio_driver *mdiodrv = to_mdio_driver(drv); |
648ea013 FF |
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; | |
df16c1c5 | 65 | mdiodev->reset_state = -1; |
a9049e0c AL |
66 | |
67 | dev_set_name(&mdiodev->dev, PHY_ID_FMT, bus->id, addr); | |
68 | ||
69 | device_initialize(&mdiodev->dev); | |
70 | ||
71 | return mdiodev; | |
72 | } | |
73 | EXPORT_SYMBOL(mdio_device_create); | |
74 | ||
75 | /** | |
76 | * mdio_device_register - Register the mdio device on the MDIO bus | |
77 | * @mdiodev: mdio_device structure to be added to the MDIO bus | |
78 | */ | |
79 | int mdio_device_register(struct mdio_device *mdiodev) | |
80 | { | |
81 | int err; | |
82 | ||
450bf1f0 | 83 | dev_dbg(&mdiodev->dev, "%s\n", __func__); |
a9049e0c AL |
84 | |
85 | err = mdiobus_register_device(mdiodev); | |
86 | if (err) | |
87 | return err; | |
88 | ||
89 | err = device_add(&mdiodev->dev); | |
90 | if (err) { | |
91 | pr_err("MDIO %d failed to add\n", mdiodev->addr); | |
92 | goto out; | |
93 | } | |
94 | ||
95 | return 0; | |
96 | ||
97 | out: | |
98 | mdiobus_unregister_device(mdiodev); | |
99 | return err; | |
100 | } | |
101 | EXPORT_SYMBOL(mdio_device_register); | |
102 | ||
103 | /** | |
104 | * mdio_device_remove - Remove a previously registered mdio device from the | |
105 | * MDIO bus | |
106 | * @mdiodev: mdio_device structure to remove | |
107 | * | |
108 | * This doesn't free the mdio_device itself, it merely reverses the effects | |
109 | * of mdio_device_register(). Use mdio_device_free() to free the device | |
110 | * after calling this function. | |
111 | */ | |
112 | void mdio_device_remove(struct mdio_device *mdiodev) | |
113 | { | |
114 | device_del(&mdiodev->dev); | |
115 | mdiobus_unregister_device(mdiodev); | |
116 | } | |
117 | EXPORT_SYMBOL(mdio_device_remove); | |
118 | ||
bafbdd52 SS |
119 | void mdio_device_reset(struct mdio_device *mdiodev, int value) |
120 | { | |
3a30ae6e RL |
121 | unsigned int d; |
122 | ||
6110ed2d | 123 | if (!mdiodev->reset_gpio && !mdiodev->reset_ctrl) |
3a30ae6e RL |
124 | return; |
125 | ||
df16c1c5 AH |
126 | if (mdiodev->reset_state == value) |
127 | return; | |
128 | ||
6110ed2d | 129 | if (mdiodev->reset_gpio) |
ea977d19 | 130 | gpiod_set_value_cansleep(mdiodev->reset_gpio, value); |
71dd6c0d DB |
131 | |
132 | if (mdiodev->reset_ctrl) { | |
133 | if (value) | |
134 | reset_control_assert(mdiodev->reset_ctrl); | |
135 | else | |
136 | reset_control_deassert(mdiodev->reset_ctrl); | |
137 | } | |
3a30ae6e | 138 | |
04f629f7 | 139 | d = value ? mdiodev->reset_assert_delay : mdiodev->reset_deassert_delay; |
3a30ae6e | 140 | if (d) |
e4d5efdd | 141 | fsleep(d); |
df16c1c5 AH |
142 | |
143 | mdiodev->reset_state = value; | |
bafbdd52 SS |
144 | } |
145 | EXPORT_SYMBOL(mdio_device_reset); | |
146 | ||
a9049e0c AL |
147 | /** |
148 | * mdio_probe - probe an MDIO device | |
149 | * @dev: device to probe | |
150 | * | |
151 | * Description: Take care of setting up the mdio_device structure | |
152 | * and calling the driver to probe the device. | |
153 | */ | |
154 | static int mdio_probe(struct device *dev) | |
155 | { | |
156 | struct mdio_device *mdiodev = to_mdio_device(dev); | |
157 | struct device_driver *drv = mdiodev->dev.driver; | |
158 | struct mdio_driver *mdiodrv = to_mdio_driver(drv); | |
159 | int err = 0; | |
160 | ||
96e26359 BG |
161 | /* Deassert the reset signal */ |
162 | mdio_device_reset(mdiodev, 0); | |
bafbdd52 | 163 | |
96e26359 | 164 | if (mdiodrv->probe) { |
a9049e0c | 165 | err = mdiodrv->probe(mdiodev); |
bafbdd52 SS |
166 | if (err) { |
167 | /* Assert the reset signal */ | |
168 | mdio_device_reset(mdiodev, 1); | |
169 | } | |
170 | } | |
a9049e0c AL |
171 | |
172 | return err; | |
173 | } | |
174 | ||
175 | static int mdio_remove(struct device *dev) | |
176 | { | |
177 | struct mdio_device *mdiodev = to_mdio_device(dev); | |
178 | struct device_driver *drv = mdiodev->dev.driver; | |
179 | struct mdio_driver *mdiodrv = to_mdio_driver(drv); | |
180 | ||
96e26359 | 181 | if (mdiodrv->remove) |
a9049e0c AL |
182 | mdiodrv->remove(mdiodev); |
183 | ||
96e26359 BG |
184 | /* Assert the reset signal */ |
185 | mdio_device_reset(mdiodev, 1); | |
bafbdd52 | 186 | |
a9049e0c AL |
187 | return 0; |
188 | } | |
189 | ||
cf957997 VO |
190 | static void mdio_shutdown(struct device *dev) |
191 | { | |
192 | struct mdio_device *mdiodev = to_mdio_device(dev); | |
193 | struct device_driver *drv = mdiodev->dev.driver; | |
194 | struct mdio_driver *mdiodrv = to_mdio_driver(drv); | |
195 | ||
196 | if (mdiodrv->shutdown) | |
197 | mdiodrv->shutdown(mdiodev); | |
198 | } | |
199 | ||
a9049e0c AL |
200 | /** |
201 | * mdio_driver_register - register an mdio_driver with the MDIO layer | |
19c5a5fe | 202 | * @drv: new mdio_driver to register |
a9049e0c AL |
203 | */ |
204 | int mdio_driver_register(struct mdio_driver *drv) | |
205 | { | |
206 | struct mdio_driver_common *mdiodrv = &drv->mdiodrv; | |
207 | int retval; | |
208 | ||
450bf1f0 | 209 | pr_debug("%s: %s\n", __func__, mdiodrv->driver.name); |
a9049e0c AL |
210 | |
211 | mdiodrv->driver.bus = &mdio_bus_type; | |
212 | mdiodrv->driver.probe = mdio_probe; | |
213 | mdiodrv->driver.remove = mdio_remove; | |
cf957997 | 214 | mdiodrv->driver.shutdown = mdio_shutdown; |
a9049e0c AL |
215 | |
216 | retval = driver_register(&mdiodrv->driver); | |
217 | if (retval) { | |
218 | pr_err("%s: Error %d in registering driver\n", | |
219 | mdiodrv->driver.name, retval); | |
220 | ||
221 | return retval; | |
222 | } | |
223 | ||
224 | return 0; | |
225 | } | |
226 | EXPORT_SYMBOL(mdio_driver_register); | |
227 | ||
228 | void mdio_driver_unregister(struct mdio_driver *drv) | |
229 | { | |
230 | struct mdio_driver_common *mdiodrv = &drv->mdiodrv; | |
231 | ||
232 | driver_unregister(&mdiodrv->driver); | |
233 | } | |
234 | EXPORT_SYMBOL(mdio_driver_unregister); |