tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * drivers/net/phy/mdio_bus.c
3 *
4 * MDIO Bus interface
5 *
6 * Author: Andy Fleming
7 *
8 * Copyright (c) 2004 Freescale Semiconductor, Inc.
9 *
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
14 *
15 */
16#include <linux/kernel.h>
17#include <linux/string.h>
18#include <linux/errno.h>
19#include <linux/unistd.h>
20#include <linux/slab.h>
21#include <linux/interrupt.h>
22#include <linux/init.h>
23#include <linux/delay.h>
24#include <linux/netdevice.h>
25#include <linux/etherdevice.h>
26#include <linux/skbuff.h>
27#include <linux/spinlock.h>
28#include <linux/mm.h>
29#include <linux/module.h>
30#include <linux/mii.h>
31#include <linux/ethtool.h>
32#include <linux/phy.h>
33
34#include <asm/io.h>
35#include <asm/irq.h>
36#include <asm/uaccess.h>
37
38/* mdiobus_register
39 *
40 * description: Called by a bus driver to bring up all the PHYs
41 * on a given bus, and attach them to the bus
42 */
43int mdiobus_register(struct mii_bus *bus)
44{
45 int i;
46 int err = 0;
47
48 spin_lock_init(&bus->mdio_lock);
49
50 if (NULL == bus || NULL == bus->name ||
51 NULL == bus->read ||
52 NULL == bus->write)
53 return -EINVAL;
54
55 if (bus->reset)
56 bus->reset(bus);
57
58 for (i = 0; i < PHY_MAX_ADDR; i++) {
59 struct phy_device *phydev;
60
61 if (bus->phy_mask & (1 << i)) {
62 bus->phy_map[i] = NULL;
63 continue;
64 }
65
66 phydev = get_phy_device(bus, i);
67
68 if (IS_ERR(phydev))
69 return PTR_ERR(phydev);
70
71 /* There's a PHY at this address
72 * We need to set:
73 * 1) IRQ
74 * 2) bus_id
75 * 3) parent
76 * 4) bus
77 * 5) mii_bus
78 * And, we need to register it */
79 if (phydev) {
80 phydev->irq = bus->irq[i];
81
82 phydev->dev.parent = bus->dev;
83 phydev->dev.bus = &mdio_bus_type;
84 snprintf(phydev->dev.bus_id, BUS_ID_SIZE, PHY_ID_FMT, bus->id, i);
85
86 phydev->bus = bus;
87
88 err = device_register(&phydev->dev);
89
90 if (err)
91 printk(KERN_ERR "phy %d failed to register\n",
92 i);
93 }
94
95 bus->phy_map[i] = phydev;
96 }
97
98 pr_info("%s: probed\n", bus->name);
99
100 return err;
101}
102EXPORT_SYMBOL(mdiobus_register);
103
104void mdiobus_unregister(struct mii_bus *bus)
105{
106 int i;
107
108 for (i = 0; i < PHY_MAX_ADDR; i++) {
109 if (bus->phy_map[i]) {
110 device_unregister(&bus->phy_map[i]->dev);
111 kfree(bus->phy_map[i]);
112 }
113 }
114}
115EXPORT_SYMBOL(mdiobus_unregister);
116
117/* mdio_bus_match
118 *
119 * description: Given a PHY device, and a PHY driver, return 1 if
120 * the driver supports the device. Otherwise, return 0
121 */
122static int mdio_bus_match(struct device *dev, struct device_driver *drv)
123{
124 struct phy_device *phydev = to_phy_device(dev);
125 struct phy_driver *phydrv = to_phy_driver(drv);
126
127 return (phydrv->phy_id == (phydev->phy_id & phydrv->phy_id_mask));
128}
129
130/* Suspend and resume. Copied from platform_suspend and
131 * platform_resume
132 */
133static int mdio_bus_suspend(struct device * dev, pm_message_t state)
134{
135 int ret = 0;
136 struct device_driver *drv = dev->driver;
137
138 if (drv && drv->suspend)
139 ret = drv->suspend(dev, state);
140
141 return ret;
142}
143
144static int mdio_bus_resume(struct device * dev)
145{
146 int ret = 0;
147 struct device_driver *drv = dev->driver;
148
149 if (drv && drv->resume)
150 ret = drv->resume(dev);
151
152 return ret;
153}
154
155struct bus_type mdio_bus_type = {
156 .name = "mdio_bus",
157 .match = mdio_bus_match,
158 .suspend = mdio_bus_suspend,
159 .resume = mdio_bus_resume,
160};
161EXPORT_SYMBOL(mdio_bus_type);
162
163int __init mdio_bus_init(void)
164{
165 return bus_register(&mdio_bus_type);
166}
167
168void mdio_bus_exit(void)
169{
170 bus_unregister(&mdio_bus_type);
171}