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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/interrupt.h>
19#include <linux/netdevice.h>
20#include <linux/etherdevice.h>
21#include <linux/mii.h>
22#include <linux/platform_device.h>
23#include <linux/mdio-bitbang.h>
24#include <linux/of_address.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 u32 __iomem *dir;
33 u32 __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 */
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 /* Read back to flush the write. */
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 /* Read back to flush the write. */
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 /* Read back to flush the write. */
100 in_be32(bitbang->dat);
101}
102
103static const 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 fs_mii_bitbang_init(struct mii_bus *bus, struct device_node *np)
112{
113 struct resource res;
114 const u32 *data;
115 int mdio_pin, mdc_pin, len;
116 struct bb_info *bitbang = bus->priv;
117
118 int ret = of_address_to_resource(np, 0, &res);
119 if (ret)
120 return ret;
121
122 if (resource_size(&res) <= 13)
123 return -ENODEV;
124
125 /* This should really encode the pin number as well, but all
126 * we get is an int, and the odds of multiple bitbang mdio buses
127 * is low enough that it's not worth going too crazy.
128 */
129 snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
130
131 data = of_get_property(np, "fsl,mdio-pin", &len);
132 if (!data || len != 4)
133 return -ENODEV;
134 mdio_pin = *data;
135
136 data = of_get_property(np, "fsl,mdc-pin", &len);
137 if (!data || len != 4)
138 return -ENODEV;
139 mdc_pin = *data;
140
141 bitbang->dir = ioremap(res.start, resource_size(&res));
142 if (!bitbang->dir)
143 return -ENOMEM;
144
145 bitbang->dat = bitbang->dir + 4;
146 bitbang->mdio_msk = 1 << (31 - mdio_pin);
147 bitbang->mdc_msk = 1 << (31 - mdc_pin);
148
149 return 0;
150}
151
152static int fs_enet_mdio_probe(struct platform_device *ofdev)
153{
154 struct mii_bus *new_bus;
155 struct bb_info *bitbang;
156 int ret = -ENOMEM;
157
158 bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL);
159 if (!bitbang)
160 goto out;
161
162 bitbang->ctrl.ops = &bb_ops;
163
164 new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
165 if (!new_bus)
166 goto out_free_priv;
167
168 new_bus->name = "CPM2 Bitbanged MII",
169
170 ret = fs_mii_bitbang_init(new_bus, ofdev->dev.of_node);
171 if (ret)
172 goto out_free_bus;
173
174 new_bus->phy_mask = ~0;
175
176 new_bus->parent = &ofdev->dev;
177 platform_set_drvdata(ofdev, new_bus);
178
179 ret = of_mdiobus_register(new_bus, ofdev->dev.of_node);
180 if (ret)
181 goto out_unmap_regs;
182
183 return 0;
184
185out_unmap_regs:
186 iounmap(bitbang->dir);
187out_free_bus:
188 free_mdio_bitbang(new_bus);
189out_free_priv:
190 kfree(bitbang);
191out:
192 return ret;
193}
194
195static void fs_enet_mdio_remove(struct platform_device *ofdev)
196{
197 struct mii_bus *bus = platform_get_drvdata(ofdev);
198 struct bb_info *bitbang = bus->priv;
199
200 mdiobus_unregister(bus);
201 free_mdio_bitbang(bus);
202 iounmap(bitbang->dir);
203 kfree(bitbang);
204}
205
206static const struct of_device_id fs_enet_mdio_bb_match[] = {
207 {
208 .compatible = "fsl,cpm2-mdio-bitbang",
209 },
210 {},
211};
212MODULE_DEVICE_TABLE(of, fs_enet_mdio_bb_match);
213
214static struct platform_driver fs_enet_bb_mdio_driver = {
215 .driver = {
216 .name = "fsl-bb-mdio",
217 .of_match_table = fs_enet_mdio_bb_match,
218 },
219 .probe = fs_enet_mdio_probe,
220 .remove_new = fs_enet_mdio_remove,
221};
222
223module_platform_driver(fs_enet_bb_mdio_driver);
224MODULE_LICENSE("GPL");
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/interrupt.h>
19#include <linux/netdevice.h>
20#include <linux/etherdevice.h>
21#include <linux/mii.h>
22#include <linux/platform_device.h>
23#include <linux/mdio-bitbang.h>
24#include <linux/of_address.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/* 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 */
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 /* Read back to flush the write. */
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 /* Read back to flush the write. */
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 /* Read back to flush the write. */
100 in_be32(bitbang->dat);
101}
102
103static const 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 fs_mii_bitbang_init(struct mii_bus *bus, struct device_node *np)
112{
113 struct resource res;
114 const u32 *data;
115 int mdio_pin, mdc_pin, len;
116 struct bb_info *bitbang = bus->priv;
117
118 int ret = of_address_to_resource(np, 0, &res);
119 if (ret)
120 return ret;
121
122 if (resource_size(&res) <= 13)
123 return -ENODEV;
124
125 /* This should really encode the pin number as well, but all
126 * we get is an int, and the odds of multiple bitbang mdio buses
127 * is low enough that it's not worth going too crazy.
128 */
129 snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
130
131 data = of_get_property(np, "fsl,mdio-pin", &len);
132 if (!data || len != 4)
133 return -ENODEV;
134 mdio_pin = *data;
135
136 data = of_get_property(np, "fsl,mdc-pin", &len);
137 if (!data || len != 4)
138 return -ENODEV;
139 mdc_pin = *data;
140
141 bitbang->dir = ioremap(res.start, resource_size(&res));
142 if (!bitbang->dir)
143 return -ENOMEM;
144
145 bitbang->dat = bitbang->dir + 4;
146 bitbang->mdio_msk = 1 << (31 - mdio_pin);
147 bitbang->mdc_msk = 1 << (31 - mdc_pin);
148
149 return 0;
150}
151
152static int fs_enet_mdio_probe(struct platform_device *ofdev)
153{
154 struct mii_bus *new_bus;
155 struct bb_info *bitbang;
156 int ret = -ENOMEM;
157
158 bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL);
159 if (!bitbang)
160 goto out;
161
162 bitbang->ctrl.ops = &bb_ops;
163
164 new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
165 if (!new_bus)
166 goto out_free_priv;
167
168 new_bus->name = "CPM2 Bitbanged MII",
169
170 ret = fs_mii_bitbang_init(new_bus, ofdev->dev.of_node);
171 if (ret)
172 goto out_free_bus;
173
174 new_bus->phy_mask = ~0;
175
176 new_bus->parent = &ofdev->dev;
177 platform_set_drvdata(ofdev, new_bus);
178
179 ret = of_mdiobus_register(new_bus, ofdev->dev.of_node);
180 if (ret)
181 goto out_unmap_regs;
182
183 return 0;
184
185out_unmap_regs:
186 iounmap(bitbang->dir);
187out_free_bus:
188 free_mdio_bitbang(new_bus);
189out_free_priv:
190 kfree(bitbang);
191out:
192 return ret;
193}
194
195static int fs_enet_mdio_remove(struct platform_device *ofdev)
196{
197 struct mii_bus *bus = platform_get_drvdata(ofdev);
198 struct bb_info *bitbang = bus->priv;
199
200 mdiobus_unregister(bus);
201 free_mdio_bitbang(bus);
202 iounmap(bitbang->dir);
203 kfree(bitbang);
204
205 return 0;
206}
207
208static const struct of_device_id fs_enet_mdio_bb_match[] = {
209 {
210 .compatible = "fsl,cpm2-mdio-bitbang",
211 },
212 {},
213};
214MODULE_DEVICE_TABLE(of, fs_enet_mdio_bb_match);
215
216static struct platform_driver fs_enet_bb_mdio_driver = {
217 .driver = {
218 .name = "fsl-bb-mdio",
219 .of_match_table = fs_enet_mdio_bb_match,
220 },
221 .probe = fs_enet_mdio_probe,
222 .remove = fs_enet_mdio_remove,
223};
224
225module_platform_driver(fs_enet_bb_mdio_driver);