1 /*
2 * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
3 *
4 * Copyright (c) 2003 Intracom S.A.
5 * by Pantelis Antoniou <panto@intracom.gr>
6 *
7 * 2005 (c) MontaVista Software, Inc.
8 * Vitaly Bordug <vbordug@ru.mvista.com>
9 *
10 * This file is licensed under the terms of the GNU General Public License
11 * version 2. This program is licensed "as is" without any warranty of any
12 * kind, whether express or implied.
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
30 struct 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 /* FIXME: If any other users of GPIO crop up, then these will have to
39 * have some sort of global synchronization to avoid races with other
40 * pins on the same port. The ideal solution would probably be to
41 * bind the ports to a GPIO driver, and have this be a client of it.
42 */
43 static inline void bb_set(u32 __iomem *p, u32 m)
44 {
45 out_be32(p, in_be32(p) | m);
46 }
47
48 static inline void bb_clr(u32 __iomem *p, u32 m)
49 {
50 out_be32(p, in_be32(p) & ~m);
51 }
52
53 static inline int bb_read(u32 __iomem *p, u32 m)
54 {
55 return (in_be32(p) & m) != 0;
56 }
57
58 static 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 /* Read back to flush the write. */
68 in_be32(bitbang->dir);
69 }
70
71 static 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
77 static 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 /* Read back to flush the write. */
87 in_be32(bitbang->dat);
88 }
89
90 static 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 /* Read back to flush the write. */
100 in_be32(bitbang->dat);
101 }
102
103 static 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
111 static 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 /* This should really encode the pin number as well, but all
127 * we get is an int, and the odds of multiple bitbang mdio buses
128 * is low enough that it's not worth going too crazy.
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
153 static 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
190 out_free_irqs:
191 dev_set_drvdata(&ofdev->dev, NULL);
192 kfree(new_bus->irq);
193 out_unmap_regs:
194 iounmap(bitbang->dir);
195 out_free_bus:
196 free_mdio_bitbang(new_bus);
197 out_free_priv:
198 kfree(bitbang);
199 out:
200 return ret;
201 }
202
203 static 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
218 static struct of_device_id fs_enet_mdio_bb_match[] = {
219 {
220 .compatible = "fsl,cpm2-mdio-bitbang",
221 },
222 {},
223 };
224
225 static struct of_platform_driver fs_enet_bb_mdio_driver = {
226 .name = "fsl-bb-mdio",
227 .match_table = fs_enet_mdio_bb_match,
228 .probe = fs_enet_mdio_probe,
229 .remove = fs_enet_mdio_remove,
230 };
231
232 static int fs_enet_mdio_bb_init(void)
233 {
234 return of_register_platform_driver(&fs_enet_bb_mdio_driver);
235 }
236
237 static void fs_enet_mdio_bb_exit(void)
238 {
239 of_unregister_platform_driver(&fs_enet_bb_mdio_driver);
240 }
241
242 module_init(fs_enet_mdio_bb_init);
243 module_exit(fs_enet_mdio_bb_exit);
244
|
This page was automatically generated by the
LXR engine.
|