tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Driver for the MPC5200 Fast Ethernet Controller - MDIO bus driver
3 *
4 * Copyright (C) 2007 Domen Puncer, Telargo, Inc.
5 * Copyright (C) 2008 Wolfram Sang, Pengutronix
6 *
7 * This file is licensed under the terms of the GNU General Public License
8 * version 2. This program is licensed "as is" without any warranty of any
9 * kind, whether express or implied.
10 */
11
12#include <linux/kernel.h>
13#include <linux/module.h>
14#include <linux/netdevice.h>
15#include <linux/phy.h>
16#include <linux/of_platform.h>
17#include <linux/slab.h>
18#include <linux/of_mdio.h>
19#include <asm/io.h>
20#include <asm/mpc52xx.h>
21#include "fec_mpc52xx.h"
22
23struct mpc52xx_fec_mdio_priv {
24 struct mpc52xx_fec __iomem *regs;
25 int mdio_irqs[PHY_MAX_ADDR];
26};
27
28static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,
29 int reg, u32 value)
30{
31 struct mpc52xx_fec_mdio_priv *priv = bus->priv;
32 struct mpc52xx_fec __iomem *fec = priv->regs;
33 int tries = 3;
34
35 value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
36 value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
37
38 out_be32(&fec->ievent, FEC_IEVENT_MII);
39 out_be32(&fec->mii_data, value);
40
41 /* wait for it to finish, this takes about 23 us on lite5200b */
42 while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
43 msleep(1);
44
45 if (!tries)
46 return -ETIMEDOUT;
47
48 return value & FEC_MII_DATA_OP_RD ?
49 in_be32(&fec->mii_data) & FEC_MII_DATA_DATAMSK : 0;
50}
51
52static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
53{
54 return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME);
55}
56
57static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg,
58 u16 data)
59{
60 return mpc52xx_fec_mdio_transfer(bus, phy_id, reg,
61 data | FEC_MII_WRITE_FRAME);
62}
63
64static int mpc52xx_fec_mdio_probe(struct platform_device *of,
65 const struct of_device_id *match)
66{
67 struct device *dev = &of->dev;
68 struct device_node *np = of->dev.of_node;
69 struct mii_bus *bus;
70 struct mpc52xx_fec_mdio_priv *priv;
71 struct resource res;
72 int err;
73
74 bus = mdiobus_alloc();
75 if (bus == NULL)
76 return -ENOMEM;
77 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
78 if (priv == NULL) {
79 err = -ENOMEM;
80 goto out_free;
81 }
82
83 bus->name = "mpc52xx MII bus";
84 bus->read = mpc52xx_fec_mdio_read;
85 bus->write = mpc52xx_fec_mdio_write;
86
87 /* setup irqs */
88 bus->irq = priv->mdio_irqs;
89
90 /* setup registers */
91 err = of_address_to_resource(np, 0, &res);
92 if (err)
93 goto out_free;
94 priv->regs = ioremap(res.start, resource_size(&res));
95 if (priv->regs == NULL) {
96 err = -ENOMEM;
97 goto out_free;
98 }
99
100 snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
101 bus->priv = priv;
102
103 bus->parent = dev;
104 dev_set_drvdata(dev, bus);
105
106 /* set MII speed */
107 out_be32(&priv->regs->mii_speed,
108 ((mpc5xxx_get_bus_frequency(of->dev.of_node) >> 20) / 5) << 1);
109
110 err = of_mdiobus_register(bus, np);
111 if (err)
112 goto out_unmap;
113
114 return 0;
115
116 out_unmap:
117 iounmap(priv->regs);
118 out_free:
119 kfree(priv);
120 mdiobus_free(bus);
121
122 return err;
123}
124
125static int mpc52xx_fec_mdio_remove(struct platform_device *of)
126{
127 struct device *dev = &of->dev;
128 struct mii_bus *bus = dev_get_drvdata(dev);
129 struct mpc52xx_fec_mdio_priv *priv = bus->priv;
130
131 mdiobus_unregister(bus);
132 dev_set_drvdata(dev, NULL);
133 iounmap(priv->regs);
134 kfree(priv);
135 mdiobus_free(bus);
136
137 return 0;
138}
139
140static struct of_device_id mpc52xx_fec_mdio_match[] = {
141 { .compatible = "fsl,mpc5200b-mdio", },
142 { .compatible = "fsl,mpc5200-mdio", },
143 { .compatible = "mpc5200b-fec-phy", },
144 {}
145};
146MODULE_DEVICE_TABLE(of, mpc52xx_fec_mdio_match);
147
148struct of_platform_driver mpc52xx_fec_mdio_driver = {
149 .driver = {
150 .name = "mpc5200b-fec-phy",
151 .owner = THIS_MODULE,
152 .of_match_table = mpc52xx_fec_mdio_match,
153 },
154 .probe = mpc52xx_fec_mdio_probe,
155 .remove = mpc52xx_fec_mdio_remove,
156};
157
158/* let fec driver call it, since this has to be registered before it */
159EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
160
161MODULE_LICENSE("Dual BSD/GPL");