1
2
3
4
5
6
7
8
9
10
11
12
13
14
15#include <linux/module.h>
16#include <linux/ioport.h>
17#include <linux/slab.h>
18#include <linux/init.h>
19#include <linux/interrupt.h>
20#include <linux/netdevice.h>
21#include <linux/etherdevice.h>
22#include <linux/mii.h>
23#include <linux/platform_device.h>
24#include <linux/mdio-bitbang.h>
25#include <linux/of_mdio.h>
26#include <linux/of_platform.h>
27
28#include "fs_enet.h"
29
30struct bb_info {
31 struct mdiobb_ctrl ctrl;
32 __be32 __iomem *dir;
33 __be32 __iomem *dat;
34 u32 mdio_msk;
35 u32 mdc_msk;
36};
37
38
39
40
41
42
43static inline void bb_set(u32 __iomem *p, u32 m)
44{
45 out_be32(p, in_be32(p) | m);
46}
47
48static inline void bb_clr(u32 __iomem *p, u32 m)
49{
50 out_be32(p, in_be32(p) & ~m);
51}
52
53static inline int bb_read(u32 __iomem *p, u32 m)
54{
55 return (in_be32(p) & m) != 0;
56}
57
58static inline void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
59{
60 struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
61
62 if (dir)
63 bb_set(bitbang->dir, bitbang->mdio_msk);
64 else
65 bb_clr(bitbang->dir, bitbang->mdio_msk);
66
67
68 in_be32(bitbang->dir);
69}
70
71static inline int mdio_read(struct mdiobb_ctrl *ctrl)
72{
73 struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
74 return bb_read(bitbang->dat, bitbang->mdio_msk);
75}
76
77static inline void mdio(struct mdiobb_ctrl *ctrl, int what)
78{
79 struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
80
81 if (what)
82 bb_set(bitbang->dat, bitbang->mdio_msk);
83 else
84 bb_clr(bitbang->dat, bitbang->mdio_msk);
85
86
87 in_be32(bitbang->dat);
88}
89
90static inline void mdc(struct mdiobb_ctrl *ctrl, int what)
91{
92 struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
93
94 if (what)
95 bb_set(bitbang->dat, bitbang->mdc_msk);
96 else
97 bb_clr(bitbang->dat, bitbang->mdc_msk);
98
99
100 in_be32(bitbang->dat);
101}
102
103static struct mdiobb_ops bb_ops = {
104 .owner = THIS_MODULE,
105 .set_mdc = mdc,
106 .set_mdio_dir = mdio_dir,
107 .set_mdio_data = mdio,
108 .get_mdio_data = mdio_read,
109};
110
111static int __devinit fs_mii_bitbang_init(struct mii_bus *bus,
112 struct device_node *np)
113{
114 struct resource res;
115 const u32 *data;
116 int mdio_pin, mdc_pin, len;
117 struct bb_info *bitbang = bus->priv;
118
119 int ret = of_address_to_resource(np, 0, &res);
120 if (ret)
121 return ret;
122
123 if (res.end - res.start < 13)
124 return -ENODEV;
125
126
127
128
129
130 snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
131
132 data = of_get_property(np, "fsl,mdio-pin", &len);
133 if (!data || len != 4)
134 return -ENODEV;
135 mdio_pin = *data;
136
137 data = of_get_property(np, "fsl,mdc-pin", &len);
138 if (!data || len != 4)
139 return -ENODEV;
140 mdc_pin = *data;
141
142 bitbang->dir = ioremap(res.start, res.end - res.start + 1);
143 if (!bitbang->dir)
144 return -ENOMEM;
145
146 bitbang->dat = bitbang->dir + 4;
147 bitbang->mdio_msk = 1 << (31 - mdio_pin);
148 bitbang->mdc_msk = 1 << (31 - mdc_pin);
149
150 return 0;
151}
152
153static int __devinit fs_enet_mdio_probe(struct of_device *ofdev,
154 const struct of_device_id *match)
155{
156 struct mii_bus *new_bus;
157 struct bb_info *bitbang;
158 int ret = -ENOMEM;
159
160 bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL);
161 if (!bitbang)
162 goto out;
163
164 bitbang->ctrl.ops = &bb_ops;
165
166 new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
167 if (!new_bus)
168 goto out_free_priv;
169
170 new_bus->name = "CPM2 Bitbanged MII",
171
172 ret = fs_mii_bitbang_init(new_bus, ofdev->node);
173 if (ret)
174 goto out_free_bus;
175
176 new_bus->phy_mask = ~0;
177 new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
178 if (!new_bus->irq)
179 goto out_unmap_regs;
180
181 new_bus->parent = &ofdev->dev;
182 dev_set_drvdata(&ofdev->dev, new_bus);
183
184 ret = of_mdiobus_register(new_bus, ofdev->node);
185 if (ret)
186 goto out_free_irqs;
187
188 return 0;
189
190out_free_irqs:
191 dev_set_drvdata(&ofdev->dev, NULL);
192 kfree(new_bus->irq);
193out_unmap_regs:
194 iounmap(bitbang->dir);
195out_free_bus:
196 free_mdio_bitbang(new_bus);
197out_free_priv:
198 kfree(bitbang);
199out:
200 return ret;
201}
202
203static int fs_enet_mdio_remove(struct of_device *ofdev)
204{
205 struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
206 struct bb_info *bitbang = bus->priv;
207
208 mdiobus_unregister(bus);
209 dev_set_drvdata(&ofdev->dev, NULL);
210 kfree(bus->irq);
211 free_mdio_bitbang(bus);
212 iounmap(bitbang->dir);
213 kfree(bitbang);
214
215 return 0;
216}
217
218static struct of_device_id fs_enet_mdio_bb_match[] = {
219 {
220 .compatible = "fsl,cpm2-mdio-bitbang",
221 },
222 {},
223};
224MODULE_DEVICE_TABLE(of, fs_enet_mdio_bb_match);
225
226static struct of_platform_driver fs_enet_bb_mdio_driver = {
227 .name = "fsl-bb-mdio",
228 .match_table = fs_enet_mdio_bb_match,
229 .probe = fs_enet_mdio_probe,
230 .remove = fs_enet_mdio_remove,
231};
232
233static int fs_enet_mdio_bb_init(void)
234{
235 return of_register_platform_driver(&fs_enet_bb_mdio_driver);
236}
237
238static void fs_enet_mdio_bb_exit(void)
239{
240 of_unregister_platform_driver(&fs_enet_bb_mdio_driver);
241}
242
243module_init(fs_enet_mdio_bb_init);
244module_exit(fs_enet_mdio_bb_exit);
245