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/slab.h> |
17 | #include <linux/of.h> |
18 | #include <linux/of_address.h> |
19 | #include <linux/of_mdio.h> |
20 | #include <linux/platform_device.h> |
21 | #include <asm/io.h> |
22 | #include <asm/mpc52xx.h> |
23 | #include "fec_mpc52xx.h" |
24 | |
25 | struct mpc52xx_fec_mdio_priv { |
26 | struct mpc52xx_fec __iomem *regs; |
27 | }; |
28 | |
29 | static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id, |
30 | int reg, u32 value) |
31 | { |
32 | struct mpc52xx_fec_mdio_priv *priv = bus->priv; |
33 | struct mpc52xx_fec __iomem *fec = priv->regs; |
34 | int tries = 3; |
35 | |
36 | value |= (phy_id << FEC_MII_DATA_PA_SHIFT) & FEC_MII_DATA_PA_MSK; |
37 | value |= (reg << FEC_MII_DATA_RA_SHIFT) & FEC_MII_DATA_RA_MSK; |
38 | |
39 | out_be32(&fec->ievent, FEC_IEVENT_MII); |
40 | out_be32(&fec->mii_data, value); |
41 | |
42 | /* wait for it to finish, this takes about 23 us on lite5200b */ |
43 | while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries) |
44 | msleep(msecs: 1); |
45 | |
46 | if (!tries) |
47 | return -ETIMEDOUT; |
48 | |
49 | return value & FEC_MII_DATA_OP_RD ? |
50 | in_be32(&fec->mii_data) & FEC_MII_DATA_DATAMSK : 0; |
51 | } |
52 | |
53 | static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg) |
54 | { |
55 | return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME); |
56 | } |
57 | |
58 | static int mpc52xx_fec_mdio_write(struct mii_bus *bus, int phy_id, int reg, |
59 | u16 data) |
60 | { |
61 | return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, |
62 | value: data | FEC_MII_WRITE_FRAME); |
63 | } |
64 | |
65 | static int mpc52xx_fec_mdio_probe(struct platform_device *of) |
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(size: 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 registers */ |
88 | err = of_address_to_resource(dev: np, index: 0, r: &res); |
89 | if (err) |
90 | goto out_free; |
91 | priv->regs = ioremap(offset: res.start, size: resource_size(res: &res)); |
92 | if (priv->regs == NULL) { |
93 | err = -ENOMEM; |
94 | goto out_free; |
95 | } |
96 | |
97 | snprintf(buf: bus->id, MII_BUS_ID_SIZE, fmt: "%x" , res.start); |
98 | bus->priv = priv; |
99 | |
100 | bus->parent = dev; |
101 | dev_set_drvdata(dev, data: bus); |
102 | |
103 | /* set MII speed */ |
104 | out_be32(&priv->regs->mii_speed, ((mpc5xxx_get_bus_frequency(dev) >> 20) / 5) << 1); |
105 | |
106 | err = of_mdiobus_register(mdio: bus, np); |
107 | if (err) |
108 | goto out_unmap; |
109 | |
110 | return 0; |
111 | |
112 | out_unmap: |
113 | iounmap(addr: priv->regs); |
114 | out_free: |
115 | kfree(objp: priv); |
116 | mdiobus_free(bus); |
117 | |
118 | return err; |
119 | } |
120 | |
121 | static void mpc52xx_fec_mdio_remove(struct platform_device *of) |
122 | { |
123 | struct mii_bus *bus = platform_get_drvdata(pdev: of); |
124 | struct mpc52xx_fec_mdio_priv *priv = bus->priv; |
125 | |
126 | mdiobus_unregister(bus); |
127 | iounmap(addr: priv->regs); |
128 | kfree(objp: priv); |
129 | mdiobus_free(bus); |
130 | } |
131 | |
132 | static const struct of_device_id mpc52xx_fec_mdio_match[] = { |
133 | { .compatible = "fsl,mpc5200b-mdio" , }, |
134 | { .compatible = "fsl,mpc5200-mdio" , }, |
135 | { .compatible = "mpc5200b-fec-phy" , }, |
136 | {} |
137 | }; |
138 | MODULE_DEVICE_TABLE(of, mpc52xx_fec_mdio_match); |
139 | |
140 | struct platform_driver mpc52xx_fec_mdio_driver = { |
141 | .driver = { |
142 | .name = "mpc5200b-fec-phy" , |
143 | .owner = THIS_MODULE, |
144 | .of_match_table = mpc52xx_fec_mdio_match, |
145 | }, |
146 | .probe = mpc52xx_fec_mdio_probe, |
147 | .remove_new = mpc52xx_fec_mdio_remove, |
148 | }; |
149 | |
150 | /* let fec driver call it, since this has to be registered before it */ |
151 | EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver); |
152 | |
153 | MODULE_LICENSE("Dual BSD/GPL" ); |
154 | |