1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
|
/*
* Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
*
* Copyright (c) 2003 Intracom S.A.
* by Pantelis Antoniou <panto@intracom.gr>
*
* 2005 (c) MontaVista Software, Inc.
* Vitaly Bordug <vbordug@ru.mvista.com>
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*/
#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/mii.h>
#include <linux/platform_device.h>
#include <linux/mdio-bitbang.h>
#include <linux/of_address.h>
#include <linux/of_mdio.h>
#include <linux/of_platform.h>
#include "fs_enet.h"
struct bb_info {
struct mdiobb_ctrl ctrl;
__be32 __iomem *dir;
__be32 __iomem *dat;
u32 mdio_msk;
u32 mdc_msk;
};
/* FIXME: If any other users of GPIO crop up, then these will have to
* have some sort of global synchronization to avoid races with other
* pins on the same port. The ideal solution would probably be to
* bind the ports to a GPIO driver, and have this be a client of it.
*/
static inline void bb_set(u32 __iomem *p, u32 m)
{
out_be32(p, in_be32(p) | m);
}
static inline void bb_clr(u32 __iomem *p, u32 m)
{
out_be32(p, in_be32(p) & ~m);
}
static inline int bb_read(u32 __iomem *p, u32 m)
{
return (in_be32(p) & m) != 0;
}
static inline void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
{
struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
if (dir)
bb_set(bitbang->dir, bitbang->mdio_msk);
else
bb_clr(bitbang->dir, bitbang->mdio_msk);
/* Read back to flush the write. */
in_be32(bitbang->dir);
}
static inline int mdio_read(struct mdiobb_ctrl *ctrl)
{
struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
return bb_read(bitbang->dat, bitbang->mdio_msk);
}
static inline void mdio(struct mdiobb_ctrl *ctrl, int what)
{
struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
if (what)
bb_set(bitbang->dat, bitbang->mdio_msk);
else
bb_clr(bitbang->dat, bitbang->mdio_msk);
/* Read back to flush the write. */
in_be32(bitbang->dat);
}
static inline void mdc(struct mdiobb_ctrl *ctrl, int what)
{
struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
if (what)
bb_set(bitbang->dat, bitbang->mdc_msk);
else
bb_clr(bitbang->dat, bitbang->mdc_msk);
/* Read back to flush the write. */
in_be32(bitbang->dat);
}
static struct mdiobb_ops bb_ops = {
.owner = THIS_MODULE,
.set_mdc = mdc,
.set_mdio_dir = mdio_dir,
.set_mdio_data = mdio,
.get_mdio_data = mdio_read,
};
static int fs_mii_bitbang_init(struct mii_bus *bus, struct device_node *np)
{
struct resource res;
const u32 *data;
int mdio_pin, mdc_pin, len;
struct bb_info *bitbang = bus->priv;
int ret = of_address_to_resource(np, 0, &res);
if (ret)
return ret;
if (resource_size(&res) <= 13)
return -ENODEV;
/* This should really encode the pin number as well, but all
* we get is an int, and the odds of multiple bitbang mdio buses
* is low enough that it's not worth going too crazy.
*/
snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
data = of_get_property(np, "fsl,mdio-pin", &len);
if (!data || len != 4)
return -ENODEV;
mdio_pin = *data;
data = of_get_property(np, "fsl,mdc-pin", &len);
if (!data || len != 4)
return -ENODEV;
mdc_pin = *data;
bitbang->dir = ioremap(res.start, resource_size(&res));
if (!bitbang->dir)
return -ENOMEM;
bitbang->dat = bitbang->dir + 4;
bitbang->mdio_msk = 1 << (31 - mdio_pin);
bitbang->mdc_msk = 1 << (31 - mdc_pin);
return 0;
}
static int fs_enet_mdio_probe(struct platform_device *ofdev)
{
struct mii_bus *new_bus;
struct bb_info *bitbang;
int ret = -ENOMEM;
bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL);
if (!bitbang)
goto out;
bitbang->ctrl.ops = &bb_ops;
new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
if (!new_bus)
goto out_free_priv;
new_bus->name = "CPM2 Bitbanged MII",
ret = fs_mii_bitbang_init(new_bus, ofdev->dev.of_node);
if (ret)
goto out_free_bus;
new_bus->phy_mask = ~0;
new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
if (!new_bus->irq) {
ret = -ENOMEM;
goto out_unmap_regs;
}
new_bus->parent = &ofdev->dev;
platform_set_drvdata(ofdev, new_bus);
ret = of_mdiobus_register(new_bus, ofdev->dev.of_node);
if (ret)
goto out_free_irqs;
return 0;
out_free_irqs:
kfree(new_bus->irq);
out_unmap_regs:
iounmap(bitbang->dir);
out_free_bus:
free_mdio_bitbang(new_bus);
out_free_priv:
kfree(bitbang);
out:
return ret;
}
static int fs_enet_mdio_remove(struct platform_device *ofdev)
{
struct mii_bus *bus = platform_get_drvdata(ofdev);
struct bb_info *bitbang = bus->priv;
mdiobus_unregister(bus);
kfree(bus->irq);
free_mdio_bitbang(bus);
iounmap(bitbang->dir);
kfree(bitbang);
return 0;
}
static struct of_device_id fs_enet_mdio_bb_match[] = {
{
.compatible = "fsl,cpm2-mdio-bitbang",
},
{},
};
MODULE_DEVICE_TABLE(of, fs_enet_mdio_bb_match);
static struct platform_driver fs_enet_bb_mdio_driver = {
.driver = {
.name = "fsl-bb-mdio",
.owner = THIS_MODULE,
.of_match_table = fs_enet_mdio_bb_match,
},
.probe = fs_enet_mdio_probe,
.remove = fs_enet_mdio_remove,
};
module_platform_driver(fs_enet_bb_mdio_driver);
|
