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5d031e9e DP |
1 | /* |
2 | * Driver for the MPC5200 Fast Ethernet Controller - MDIO bus driver | |
3 | * | |
4 | * Copyright (C) 2007 Domen Puncer, Telargo, Inc. | |
51d9861e | 5 | * Copyright (C) 2008 Wolfram Sang, Pengutronix |
5d031e9e DP |
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> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
ca816d98 | 18 | #include <linux/of_mdio.h> |
5d031e9e DP |
19 | #include <asm/io.h> |
20 | #include <asm/mpc52xx.h> | |
21 | #include "fec_mpc52xx.h" | |
22 | ||
23 | struct mpc52xx_fec_mdio_priv { | |
24 | struct mpc52xx_fec __iomem *regs; | |
ca816d98 | 25 | int mdio_irqs[PHY_MAX_ADDR]; |
5d031e9e DP |
26 | }; |
27 | ||
51d9861e WS |
28 | static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id, |
29 | int reg, u32 value) | |
5d031e9e DP |
30 | { |
31 | struct mpc52xx_fec_mdio_priv *priv = bus->priv; | |
32 | struct mpc52xx_fec __iomem *fec; | |
ca816d98 | 33 | int tries = 3; |
51d9861e WS |
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; | |
5d031e9e DP |
37 | |
38 | fec = priv->regs; | |
39 | out_be32(&fec->ievent, FEC_IEVENT_MII); | |
51d9861e | 40 | out_be32(&priv->regs->mii_data, value); |
5d031e9e DP |
41 | |
42 | /* wait for it to finish, this takes about 23 us on lite5200b */ | |
43 | while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries) | |
ca816d98 | 44 | msleep(1); |
5d031e9e | 45 | |
51d9861e | 46 | if (!tries) |
5d031e9e DP |
47 | return -ETIMEDOUT; |
48 | ||
51d9861e WS |
49 | return value & FEC_MII_DATA_OP_RD ? |
50 | in_be32(&priv->regs->mii_data) & FEC_MII_DATA_DATAMSK : 0; | |
5d031e9e DP |
51 | } |
52 | ||
51d9861e | 53 | static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg) |
5d031e9e | 54 | { |
51d9861e WS |
55 | return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME); |
56 | } | |
5d031e9e | 57 | |
51d9861e WS |
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 | data | FEC_MII_WRITE_FRAME); | |
5d031e9e DP |
63 | } |
64 | ||
51d9861e WS |
65 | static int mpc52xx_fec_mdio_probe(struct of_device *of, |
66 | const struct of_device_id *match) | |
5d031e9e DP |
67 | { |
68 | struct device *dev = &of->dev; | |
69 | struct device_node *np = of->node; | |
5d031e9e DP |
70 | struct mii_bus *bus; |
71 | struct mpc52xx_fec_mdio_priv *priv; | |
72 | struct resource res = {}; | |
73 | int err; | |
74 | int i; | |
75 | ||
298cf9be | 76 | bus = mdiobus_alloc(); |
5d031e9e DP |
77 | if (bus == NULL) |
78 | return -ENOMEM; | |
79 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
80 | if (priv == NULL) { | |
81 | err = -ENOMEM; | |
82 | goto out_free; | |
83 | } | |
84 | ||
85 | bus->name = "mpc52xx MII bus"; | |
86 | bus->read = mpc52xx_fec_mdio_read; | |
87 | bus->write = mpc52xx_fec_mdio_write; | |
88 | ||
89 | /* setup irqs */ | |
ca816d98 | 90 | bus->irq = priv->mdio_irqs; |
5d031e9e DP |
91 | |
92 | /* setup registers */ | |
93 | err = of_address_to_resource(np, 0, &res); | |
94 | if (err) | |
95 | goto out_free; | |
96 | priv->regs = ioremap(res.start, res.end - res.start + 1); | |
97 | if (priv->regs == NULL) { | |
98 | err = -ENOMEM; | |
99 | goto out_free; | |
100 | } | |
101 | ||
9d9326d3 | 102 | snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start); |
5d031e9e DP |
103 | bus->priv = priv; |
104 | ||
18ee49dd | 105 | bus->parent = dev; |
5d031e9e DP |
106 | dev_set_drvdata(dev, bus); |
107 | ||
108 | /* set MII speed */ | |
51d9861e | 109 | out_be32(&priv->regs->mii_speed, |
87c441e5 | 110 | ((mpc5xxx_get_bus_frequency(of->node) >> 20) / 5) << 1); |
5d031e9e | 111 | |
ca816d98 | 112 | err = of_mdiobus_register(bus, np); |
5d031e9e DP |
113 | if (err) |
114 | goto out_unmap; | |
115 | ||
116 | return 0; | |
117 | ||
118 | out_unmap: | |
119 | iounmap(priv->regs); | |
120 | out_free: | |
121 | for (i=0; i<PHY_MAX_ADDR; i++) | |
122 | if (bus->irq[i] != PHY_POLL) | |
123 | irq_dispose_mapping(bus->irq[i]); | |
124 | kfree(bus->irq); | |
125 | kfree(priv); | |
298cf9be | 126 | mdiobus_free(bus); |
5d031e9e DP |
127 | |
128 | return err; | |
129 | } | |
130 | ||
131 | static int mpc52xx_fec_mdio_remove(struct of_device *of) | |
132 | { | |
133 | struct device *dev = &of->dev; | |
134 | struct mii_bus *bus = dev_get_drvdata(dev); | |
135 | struct mpc52xx_fec_mdio_priv *priv = bus->priv; | |
136 | int i; | |
137 | ||
138 | mdiobus_unregister(bus); | |
139 | dev_set_drvdata(dev, NULL); | |
140 | ||
141 | iounmap(priv->regs); | |
142 | for (i=0; i<PHY_MAX_ADDR; i++) | |
e51f47a5 | 143 | if (bus->irq[i] != PHY_POLL) |
5d031e9e DP |
144 | irq_dispose_mapping(bus->irq[i]); |
145 | kfree(priv); | |
146 | kfree(bus->irq); | |
298cf9be | 147 | mdiobus_free(bus); |
5d031e9e DP |
148 | |
149 | return 0; | |
150 | } | |
151 | ||
152 | ||
153 | static struct of_device_id mpc52xx_fec_mdio_match[] = { | |
66ffbe49 | 154 | { .compatible = "fsl,mpc5200b-mdio", }, |
8d813941 | 155 | { .compatible = "fsl,mpc5200-mdio", }, |
66ffbe49 GL |
156 | { .compatible = "mpc5200b-fec-phy", }, |
157 | {} | |
5d031e9e | 158 | }; |
e72701ac | 159 | MODULE_DEVICE_TABLE(of, mpc52xx_fec_mdio_match); |
5d031e9e DP |
160 | |
161 | struct of_platform_driver mpc52xx_fec_mdio_driver = { | |
162 | .name = "mpc5200b-fec-phy", | |
163 | .probe = mpc52xx_fec_mdio_probe, | |
164 | .remove = mpc52xx_fec_mdio_remove, | |
165 | .match_table = mpc52xx_fec_mdio_match, | |
166 | }; | |
167 | ||
168 | /* let fec driver call it, since this has to be registered before it */ | |
169 | EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver); | |
170 | ||
171 | ||
172 | MODULE_LICENSE("Dual BSD/GPL"); |