Commit | Line | Data |
---|---|---|
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> | |
17 | #include <asm/io.h> | |
18 | #include <asm/mpc52xx.h> | |
19 | #include "fec_mpc52xx.h" | |
20 | ||
21 | struct mpc52xx_fec_mdio_priv { | |
22 | struct mpc52xx_fec __iomem *regs; | |
23 | }; | |
24 | ||
51d9861e WS |
25 | static int mpc52xx_fec_mdio_transfer(struct mii_bus *bus, int phy_id, |
26 | int reg, u32 value) | |
5d031e9e DP |
27 | { |
28 | struct mpc52xx_fec_mdio_priv *priv = bus->priv; | |
29 | struct mpc52xx_fec __iomem *fec; | |
30 | int tries = 100; | |
51d9861e WS |
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; | |
5d031e9e DP |
34 | |
35 | fec = priv->regs; | |
36 | out_be32(&fec->ievent, FEC_IEVENT_MII); | |
51d9861e | 37 | out_be32(&priv->regs->mii_data, value); |
5d031e9e DP |
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 | ||
51d9861e | 43 | if (!tries) |
5d031e9e DP |
44 | return -ETIMEDOUT; |
45 | ||
51d9861e WS |
46 | return value & FEC_MII_DATA_OP_RD ? |
47 | in_be32(&priv->regs->mii_data) & FEC_MII_DATA_DATAMSK : 0; | |
5d031e9e DP |
48 | } |
49 | ||
51d9861e | 50 | static int mpc52xx_fec_mdio_read(struct mii_bus *bus, int phy_id, int reg) |
5d031e9e | 51 | { |
51d9861e WS |
52 | return mpc52xx_fec_mdio_transfer(bus, phy_id, reg, FEC_MII_READ_FRAME); |
53 | } | |
5d031e9e | 54 | |
51d9861e WS |
55 | static 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); | |
5d031e9e DP |
60 | } |
61 | ||
51d9861e WS |
62 | static int mpc52xx_fec_mdio_probe(struct of_device *of, |
63 | const struct of_device_id *match) | |
5d031e9e DP |
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 | ||
298cf9be | 74 | bus = mdiobus_alloc(); |
5d031e9e DP |
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); | |
b8c19eb1 GL |
100 | if (id) |
101 | bus->irq[*id] = irq; | |
5d031e9e DP |
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 | ||
9d9326d3 | 115 | snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start); |
5d031e9e DP |
116 | bus->priv = priv; |
117 | ||
18ee49dd | 118 | bus->parent = dev; |
5d031e9e DP |
119 | dev_set_drvdata(dev, bus); |
120 | ||
121 | /* set MII speed */ | |
51d9861e WS |
122 | out_be32(&priv->regs->mii_speed, |
123 | ((mpc52xx_find_ipb_freq(of->node) >> 20) / 5) << 1); | |
5d031e9e | 124 | |
5d031e9e DP |
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); | |
298cf9be | 139 | mdiobus_free(bus); |
5d031e9e DP |
140 | |
141 | return err; | |
142 | } | |
143 | ||
144 | static 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++) | |
e51f47a5 | 156 | if (bus->irq[i] != PHY_POLL) |
5d031e9e DP |
157 | irq_dispose_mapping(bus->irq[i]); |
158 | kfree(priv); | |
159 | kfree(bus->irq); | |
298cf9be | 160 | mdiobus_free(bus); |
5d031e9e DP |
161 | |
162 | return 0; | |
163 | } | |
164 | ||
165 | ||
166 | static struct of_device_id mpc52xx_fec_mdio_match[] = { | |
66ffbe49 | 167 | { .compatible = "fsl,mpc5200b-mdio", }, |
8d813941 | 168 | { .compatible = "fsl,mpc5200-mdio", }, |
66ffbe49 GL |
169 | { .compatible = "mpc5200b-fec-phy", }, |
170 | {} | |
5d031e9e DP |
171 | }; |
172 | ||
173 | struct 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 */ | |
181 | EXPORT_SYMBOL_GPL(mpc52xx_fec_mdio_driver); | |
182 | ||
183 | ||
184 | MODULE_LICENSE("Dual BSD/GPL"); |