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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 | ||
9 | #include <linux/errno.h> | |
bafbdd52 SS |
10 | #include <linux/gpio.h> |
11 | #include <linux/gpio/consumer.h> | |
a9049e0c AL |
12 | #include <linux/init.h> |
13 | #include <linux/interrupt.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/mdio.h> | |
16 | #include <linux/mii.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/phy.h> | |
71dd6c0d | 19 | #include <linux/reset.h> |
a9049e0c AL |
20 | #include <linux/slab.h> |
21 | #include <linux/string.h> | |
22 | #include <linux/unistd.h> | |
3a30ae6e | 23 | #include <linux/delay.h> |
a9049e0c AL |
24 | |
25 | void mdio_device_free(struct mdio_device *mdiodev) | |
26 | { | |
27 | put_device(&mdiodev->dev); | |
28 | } | |
29 | EXPORT_SYMBOL(mdio_device_free); | |
30 | ||
31 | static void mdio_device_release(struct device *dev) | |
32 | { | |
33 | kfree(to_mdio_device(dev)); | |
34 | } | |
35 | ||
648ea013 FF |
36 | int mdio_device_bus_match(struct device *dev, struct device_driver *drv) |
37 | { | |
38 | struct mdio_device *mdiodev = to_mdio_device(dev); | |
39 | struct mdio_driver *mdiodrv = to_mdio_driver(drv); | |
40 | ||
41 | if (mdiodrv->mdiodrv.flags & MDIO_DEVICE_IS_PHY) | |
42 | return 0; | |
43 | ||
44 | return strcmp(mdiodev->modalias, drv->name) == 0; | |
45 | } | |
46 | ||
a9049e0c AL |
47 | struct mdio_device *mdio_device_create(struct mii_bus *bus, int addr) |
48 | { | |
49 | struct mdio_device *mdiodev; | |
50 | ||
51 | /* We allocate the device, and initialize the default values */ | |
52 | mdiodev = kzalloc(sizeof(*mdiodev), GFP_KERNEL); | |
53 | if (!mdiodev) | |
54 | return ERR_PTR(-ENOMEM); | |
55 | ||
56 | mdiodev->dev.release = mdio_device_release; | |
57 | mdiodev->dev.parent = &bus->dev; | |
58 | mdiodev->dev.bus = &mdio_bus_type; | |
711fdba3 AL |
59 | mdiodev->device_free = mdio_device_free; |
60 | mdiodev->device_remove = mdio_device_remove; | |
a9049e0c AL |
61 | mdiodev->bus = bus; |
62 | mdiodev->addr = addr; | |
63 | ||
64 | dev_set_name(&mdiodev->dev, PHY_ID_FMT, bus->id, addr); | |
65 | ||
66 | device_initialize(&mdiodev->dev); | |
67 | ||
68 | return mdiodev; | |
69 | } | |
70 | EXPORT_SYMBOL(mdio_device_create); | |
71 | ||
72 | /** | |
73 | * mdio_device_register - Register the mdio device on the MDIO bus | |
74 | * @mdiodev: mdio_device structure to be added to the MDIO bus | |
75 | */ | |
76 | int mdio_device_register(struct mdio_device *mdiodev) | |
77 | { | |
78 | int err; | |
79 | ||
29b84f20 | 80 | dev_dbg(&mdiodev->dev, "mdio_device_register\n"); |
a9049e0c AL |
81 | |
82 | err = mdiobus_register_device(mdiodev); | |
83 | if (err) | |
84 | return err; | |
85 | ||
86 | err = device_add(&mdiodev->dev); | |
87 | if (err) { | |
88 | pr_err("MDIO %d failed to add\n", mdiodev->addr); | |
89 | goto out; | |
90 | } | |
91 | ||
92 | return 0; | |
93 | ||
94 | out: | |
95 | mdiobus_unregister_device(mdiodev); | |
96 | return err; | |
97 | } | |
98 | EXPORT_SYMBOL(mdio_device_register); | |
99 | ||
100 | /** | |
101 | * mdio_device_remove - Remove a previously registered mdio device from the | |
102 | * MDIO bus | |
103 | * @mdiodev: mdio_device structure to remove | |
104 | * | |
105 | * This doesn't free the mdio_device itself, it merely reverses the effects | |
106 | * of mdio_device_register(). Use mdio_device_free() to free the device | |
107 | * after calling this function. | |
108 | */ | |
109 | void mdio_device_remove(struct mdio_device *mdiodev) | |
110 | { | |
111 | device_del(&mdiodev->dev); | |
112 | mdiobus_unregister_device(mdiodev); | |
113 | } | |
114 | EXPORT_SYMBOL(mdio_device_remove); | |
115 | ||
bafbdd52 SS |
116 | void mdio_device_reset(struct mdio_device *mdiodev, int value) |
117 | { | |
3a30ae6e RL |
118 | unsigned int d; |
119 | ||
6110ed2d | 120 | if (!mdiodev->reset_gpio && !mdiodev->reset_ctrl) |
3a30ae6e RL |
121 | return; |
122 | ||
6110ed2d | 123 | if (mdiodev->reset_gpio) |
ea977d19 | 124 | gpiod_set_value_cansleep(mdiodev->reset_gpio, value); |
71dd6c0d DB |
125 | |
126 | if (mdiodev->reset_ctrl) { | |
127 | if (value) | |
128 | reset_control_assert(mdiodev->reset_ctrl); | |
129 | else | |
130 | reset_control_deassert(mdiodev->reset_ctrl); | |
131 | } | |
3a30ae6e | 132 | |
04f629f7 | 133 | d = value ? mdiodev->reset_assert_delay : mdiodev->reset_deassert_delay; |
3a30ae6e RL |
134 | if (d) |
135 | usleep_range(d, d + max_t(unsigned int, d / 10, 100)); | |
bafbdd52 SS |
136 | } |
137 | EXPORT_SYMBOL(mdio_device_reset); | |
138 | ||
a9049e0c AL |
139 | /** |
140 | * mdio_probe - probe an MDIO device | |
141 | * @dev: device to probe | |
142 | * | |
143 | * Description: Take care of setting up the mdio_device structure | |
144 | * and calling the driver to probe the device. | |
145 | */ | |
146 | static int mdio_probe(struct device *dev) | |
147 | { | |
148 | struct mdio_device *mdiodev = to_mdio_device(dev); | |
149 | struct device_driver *drv = mdiodev->dev.driver; | |
150 | struct mdio_driver *mdiodrv = to_mdio_driver(drv); | |
151 | int err = 0; | |
152 | ||
bafbdd52 SS |
153 | if (mdiodrv->probe) { |
154 | /* Deassert the reset signal */ | |
155 | mdio_device_reset(mdiodev, 0); | |
156 | ||
a9049e0c | 157 | err = mdiodrv->probe(mdiodev); |
bafbdd52 SS |
158 | if (err) { |
159 | /* Assert the reset signal */ | |
160 | mdio_device_reset(mdiodev, 1); | |
161 | } | |
162 | } | |
a9049e0c AL |
163 | |
164 | return err; | |
165 | } | |
166 | ||
167 | static int mdio_remove(struct device *dev) | |
168 | { | |
169 | struct mdio_device *mdiodev = to_mdio_device(dev); | |
170 | struct device_driver *drv = mdiodev->dev.driver; | |
171 | struct mdio_driver *mdiodrv = to_mdio_driver(drv); | |
172 | ||
bafbdd52 | 173 | if (mdiodrv->remove) { |
a9049e0c AL |
174 | mdiodrv->remove(mdiodev); |
175 | ||
bafbdd52 SS |
176 | /* Assert the reset signal */ |
177 | mdio_device_reset(mdiodev, 1); | |
178 | } | |
179 | ||
a9049e0c AL |
180 | return 0; |
181 | } | |
182 | ||
183 | /** | |
184 | * mdio_driver_register - register an mdio_driver with the MDIO layer | |
185 | * @new_driver: new mdio_driver to register | |
186 | */ | |
187 | int mdio_driver_register(struct mdio_driver *drv) | |
188 | { | |
189 | struct mdio_driver_common *mdiodrv = &drv->mdiodrv; | |
190 | int retval; | |
191 | ||
eb2ca35f | 192 | pr_debug("mdio_driver_register: %s\n", mdiodrv->driver.name); |
a9049e0c AL |
193 | |
194 | mdiodrv->driver.bus = &mdio_bus_type; | |
195 | mdiodrv->driver.probe = mdio_probe; | |
196 | mdiodrv->driver.remove = mdio_remove; | |
197 | ||
198 | retval = driver_register(&mdiodrv->driver); | |
199 | if (retval) { | |
200 | pr_err("%s: Error %d in registering driver\n", | |
201 | mdiodrv->driver.name, retval); | |
202 | ||
203 | return retval; | |
204 | } | |
205 | ||
206 | return 0; | |
207 | } | |
208 | EXPORT_SYMBOL(mdio_driver_register); | |
209 | ||
210 | void mdio_driver_unregister(struct mdio_driver *drv) | |
211 | { | |
212 | struct mdio_driver_common *mdiodrv = &drv->mdiodrv; | |
213 | ||
214 | driver_unregister(&mdiodrv->driver); | |
215 | } | |
216 | EXPORT_SYMBOL(mdio_driver_unregister); |