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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; | |
e9509554 | 32 | struct mpc52xx_fec __iomem *fec = priv->regs; |
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 | 37 | |
5d031e9e | 38 | out_be32(&fec->ievent, FEC_IEVENT_MII); |
e9509554 | 39 | out_be32(&fec->mii_data, value); |
5d031e9e DP |
40 | |
41 | /* wait for it to finish, this takes about 23 us on lite5200b */ | |
42 | while (!(in_be32(&fec->ievent) & FEC_IEVENT_MII) && --tries) | |
ca816d98 | 43 | msleep(1); |
5d031e9e | 44 | |
51d9861e | 45 | if (!tries) |
5d031e9e DP |
46 | return -ETIMEDOUT; |
47 | ||
51d9861e | 48 | return value & FEC_MII_DATA_OP_RD ? |
e9509554 | 49 | in_be32(&fec->mii_data) & FEC_MII_DATA_DATAMSK : 0; |
5d031e9e DP |
50 | } |
51 | ||
51d9861e | 52 | static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg) |
5d031e9e | 53 | { |
51d9861e WS |
54 | return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME); |
55 | } | |
5d031e9e | 56 | |
51d9861e WS |
57 | static 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); | |
5d031e9e DP |
62 | } |
63 | ||
74888760 | 64 | static int mpc52xx_fec_mdio_probe(struct platform_device *of) |
5d031e9e DP |
65 | { |
66 | struct device *dev = &of->dev; | |
61c7a080 | 67 | struct device_node *np = of->dev.of_node; |
5d031e9e DP |
68 | struct mii_bus *bus; |
69 | struct mpc52xx_fec_mdio_priv *priv; | |
e9509554 | 70 | struct resource res; |
5d031e9e | 71 | int err; |
5d031e9e | 72 | |
298cf9be | 73 | bus = mdiobus_alloc(); |
5d031e9e DP |
74 | if (bus == NULL) |
75 | return -ENOMEM; | |
76 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
77 | if (priv == NULL) { | |
78 | err = -ENOMEM; | |
79 | goto out_free; | |
80 | } | |
81 | ||
82 | bus->name = "mpc52xx MII bus"; | |
83 | bus->read = mpc52xx_fec_mdio_read; | |
84 | bus->write = mpc52xx_fec_mdio_write; | |
85 | ||
86 | /* setup irqs */ | |
ca816d98 | 87 | bus->irq = priv->mdio_irqs; |
5d031e9e DP |
88 | |
89 | /* setup registers */ | |
90 | err = of_address_to_resource(np, 0, &res); | |
91 | if (err) | |
92 | goto out_free; | |
e9509554 | 93 | priv->regs = ioremap(res.start, resource_size(&res)); |
5d031e9e DP |
94 | if (priv->regs == NULL) { |
95 | err = -ENOMEM; | |
96 | goto out_free; | |
97 | } | |
98 | ||
9d9326d3 | 99 | snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start); |
5d031e9e DP |
100 | bus->priv = priv; |
101 | ||
18ee49dd | 102 | bus->parent = dev; |
5d031e9e DP |
103 | dev_set_drvdata(dev, bus); |
104 | ||
105 | /* set MII speed */ | |
51d9861e | 106 | out_be32(&priv->regs->mii_speed, |
61c7a080 | 107 | ((mpc5xxx_get_bus_frequency(of->dev.of_node) >> 20) / 5) << 1); |
5d031e9e | 108 | |
ca816d98 | 109 | err = of_mdiobus_register(bus, np); |
5d031e9e DP |
110 | if (err) |
111 | goto out_unmap; | |
112 | ||
113 | return 0; | |
114 | ||
115 | out_unmap: | |
116 | iounmap(priv->regs); | |
117 | out_free: | |
5d031e9e | 118 | kfree(priv); |
298cf9be | 119 | mdiobus_free(bus); |
5d031e9e DP |
120 | |
121 | return err; | |
122 | } | |
123 | ||
2dc11581 | 124 | static int mpc52xx_fec_mdio_remove(struct platform_device *of) |
5d031e9e DP |
125 | { |
126 | struct device *dev = &of->dev; | |
127 | struct mii_bus *bus = dev_get_drvdata(dev); | |
128 | struct mpc52xx_fec_mdio_priv *priv = bus->priv; | |
5d031e9e DP |
129 | |
130 | mdiobus_unregister(bus); | |
131 | dev_set_drvdata(dev, NULL); | |
5d031e9e | 132 | iounmap(priv->regs); |
5d031e9e | 133 | kfree(priv); |
298cf9be | 134 | mdiobus_free(bus); |
5d031e9e DP |
135 | |
136 | return 0; | |
137 | } | |
138 | ||
5d031e9e | 139 | static struct of_device_id mpc52xx_fec_mdio_match[] = { |
66ffbe49 | 140 | { .compatible = "fsl,mpc5200b-mdio", }, |
8d813941 | 141 | { .compatible = "fsl,mpc5200-mdio", }, |
66ffbe49 GL |
142 | { .compatible = "mpc5200b-fec-phy", }, |
143 | {} | |
5d031e9e | 144 | }; |
e72701ac | 145 | MODULE_DEVICE_TABLE(of, mpc52xx_fec_mdio_match); |
5d031e9e | 146 | |
74888760 | 147 | struct platform_driver mpc52xx_fec_mdio_driver = { |
4018294b GL |
148 | .driver = { |
149 | .name = "mpc5200b-fec-phy", | |
150 | .owner = THIS_MODULE, | |
151 | .of_match_table = mpc52xx_fec_mdio_match, | |
152 | }, | |
5d031e9e DP |
153 | .probe = mpc52xx_fec_mdio_probe, |
154 | .remove = mpc52xx_fec_mdio_remove, | |
5d031e9e DP |
155 | }; |
156 | ||
157 | /* let fec driver call it, since this has to be registered before it */ | |
158 | EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver); | |
159 | ||
5d031e9e | 160 | MODULE_LICENSE("Dual BSD/GPL"); |