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 <asm/io.h>
18#include <asm/mpc52xx.h>
19#include "fec_mpc52xx.h"
20
21struct mpc52xx_fec_mdio_priv {
22 struct mpc52xx_fec __iomem *regs;
23};
24
25static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id,
26 int reg, u32 value)
27{
28 struct mpc52xx_fec_mdio_priv *priv = bus->priv;
29 struct mpc52xx_fec __iomem *fec;
30 int tries = 100;
31
32 value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK;
33 value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK;
34
35 fec = priv->regs;
36 out_be32(&fec->ievent, FEC_IEVENT_MII);
37 out_be32(&priv->regs->mii_data, value);
38
39 /* wait for it to finish, this takes about 23 us on lite5200b */
40 while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries)
41 udelay(5);
42
43 if (!tries)
44 return -ETIMEDOUT;
45
46 return value & FEC_MII_DATA_OP_RD ?
47 in_be32(&priv->regs->mii_data) & FEC_MII_DATA_DATAMSK : 0;
48}
49
50static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg)
51{
52 return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME);
53}
54
55static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg,
56 u16 data)
57{
58 return mpc52xx_fec_mdio_transfer(bus, phy_id, reg,
59 data | FEC_MII_WRITE_FRAME);
60}
61
62static int mpc52xx_fec_mdio_probe(struct of_device *of,
63 const struct of_device_id *match)
64{
65 struct device *dev = &of->dev;
66 struct device_node *np = of->node;
67 struct device_node *child = NULL;
68 struct mii_bus *bus;
69 struct mpc52xx_fec_mdio_priv *priv;
70 struct resource res = {};
71 int err;
72 int i;
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 = kmalloc(sizeof(bus->irq[0]) * PHY_MAX_ADDR, GFP_KERNEL);
89 if (bus->irq == NULL) {
90 err = -ENOMEM;
91 goto out_free;
92 }
93 for (i=0; i<PHY_MAX_ADDR; i++)
94 bus->irq[i] = PHY_POLL;
95
96 while ((child = of_get_next_child(np, child)) != NULL) {
97 int irq = irq_of_parse_and_map(child, 0);
98 if (irq != NO_IRQ) {
99 const u32 *id = of_get_property(child, "reg", NULL);
100 if (id)
101 bus->irq[*id] = irq;
102 }
103 }
104
105 /* setup registers */
106 err = of_address_to_resource(np, 0, &res);
107 if (err)
108 goto out_free;
109 priv->regs = ioremap(res.start, res.end - res.start + 1);
110 if (priv->regs == NULL) {
111 err = -ENOMEM;
112 goto out_free;
113 }
114
115 snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
116 bus->priv = priv;
117
118 bus->parent = dev;
119 dev_set_drvdata(dev, bus);
120
121 /* set MII speed */
122 out_be32(&priv->regs->mii_speed,
123 ((mpc52xx_find_ipb_freq(of->node) >> 20) / 5) << 1);
124
125 err = mdiobus_register(bus);
126 if (err)
127 goto out_unmap;
128
129 return 0;
130
131 out_unmap:
132 iounmap(priv->regs);
133 out_free:
134 for (i=0; i<PHY_MAX_ADDR; i++)
135 if (bus->irq[i] != PHY_POLL)
136 irq_dispose_mapping(bus->irq[i]);
137 kfree(bus->irq);
138 kfree(priv);
139 mdiobus_free(bus);
140
141 return err;
142}
143
144static int mpc52xx_fec_mdio_remove(struct of_device *of)
145{
146 struct device *dev = &of->dev;
147 struct mii_bus *bus = dev_get_drvdata(dev);
148 struct mpc52xx_fec_mdio_priv *priv = bus->priv;
149 int i;
150
151 mdiobus_unregister(bus);
152 dev_set_drvdata(dev, NULL);
153
154 iounmap(priv->regs);
155 for (i=0; i<PHY_MAX_ADDR; i++)
156 if (bus->irq[i] != PHY_POLL)
157 irq_dispose_mapping(bus->irq[i]);
158 kfree(priv);
159 kfree(bus->irq);
160 mdiobus_free(bus);
161
162 return 0;
163}
164
165
166static struct of_device_id mpc52xx_fec_mdio_match[] = {
167 { .compatible = "fsl,mpc5200b-mdio", },
168 { .compatible = "fsl,mpc5200-mdio", },
169 { .compatible = "mpc5200b-fec-phy", },
170 {}
171};
172
173struct of_platform_driver mpc52xx_fec_mdio_driver = {
174 .name = "mpc5200b-fec-phy",
175 .probe = mpc52xx_fec_mdio_probe,
176 .remove = mpc52xx_fec_mdio_remove,
177 .match_table = mpc52xx_fec_mdio_match,
178};
179
180/* let fec driver call it, since this has to be registered before it */
181EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver);
182
183
184MODULE_LICENSE("Dual BSD/GPL");