aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/phy/mdio-gpio.c
diff options
context:
space:
mode:
authorPaulius Zaleckas <paulius.zaleckas@teltonika.lt>2008-11-13 19:24:28 -0500
committerDavid S. Miller <davem@davemloft.net>2008-11-16 21:59:24 -0500
commit72af187f216ed83c77ca3e6f22dfc9caf72e9347 (patch)
tree09671545c146656ffb968d8650c5021b4fce092d /drivers/net/phy/mdio-gpio.c
parent6817ba2cd22cfed2e93d062dca3d7a82465d693d (diff)
phylib: rename mdio-ofgpio to mdio-gpio
Signed-off-by: Paulius Zaleckas <paulius.zaleckas@teltonika.lt> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/phy/mdio-gpio.c')
-rw-r--r--drivers/net/phy/mdio-gpio.c204
1 files changed, 204 insertions, 0 deletions
diff --git a/drivers/net/phy/mdio-gpio.c b/drivers/net/phy/mdio-gpio.c
new file mode 100644
index 000000000000..2ff97754e574
--- /dev/null
+++ b/drivers/net/phy/mdio-gpio.c
@@ -0,0 +1,204 @@
1/*
2 * OpenFirmware GPIO based MDIO bitbang driver.
3 *
4 * Copyright (c) 2008 CSE Semaphore Belgium.
5 * by Laurent Pinchart <laurentp@cse-semaphore.com>
6 *
7 * Based on earlier work by
8 *
9 * Copyright (c) 2003 Intracom S.A.
10 * by Pantelis Antoniou <panto@intracom.gr>
11 *
12 * 2005 (c) MontaVista Software, Inc.
13 * Vitaly Bordug <vbordug@ru.mvista.com>
14 *
15 * This file is licensed under the terms of the GNU General Public License
16 * version 2. This program is licensed "as is" without any warranty of any
17 * kind, whether express or implied.
18 */
19
20#include <linux/module.h>
21#include <linux/slab.h>
22#include <linux/init.h>
23#include <linux/interrupt.h>
24#include <linux/mdio-bitbang.h>
25#include <linux/of_gpio.h>
26#include <linux/of_platform.h>
27
28struct mdio_gpio_info {
29 struct mdiobb_ctrl ctrl;
30 int mdc, mdio;
31};
32
33static void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
34{
35 struct mdio_gpio_info *bitbang =
36 container_of(ctrl, struct mdio_gpio_info, ctrl);
37
38 if (dir)
39 gpio_direction_output(bitbang->mdio, 1);
40 else
41 gpio_direction_input(bitbang->mdio);
42}
43
44static int mdio_read(struct mdiobb_ctrl *ctrl)
45{
46 struct mdio_gpio_info *bitbang =
47 container_of(ctrl, struct mdio_gpio_info, ctrl);
48
49 return gpio_get_value(bitbang->mdio);
50}
51
52static void mdio(struct mdiobb_ctrl *ctrl, int what)
53{
54 struct mdio_gpio_info *bitbang =
55 container_of(ctrl, struct mdio_gpio_info, ctrl);
56
57 gpio_set_value(bitbang->mdio, what);
58}
59
60static void mdc(struct mdiobb_ctrl *ctrl, int what)
61{
62 struct mdio_gpio_info *bitbang =
63 container_of(ctrl, struct mdio_gpio_info, ctrl);
64
65 gpio_set_value(bitbang->mdc, what);
66}
67
68static struct mdiobb_ops mdio_gpio_ops = {
69 .owner = THIS_MODULE,
70 .set_mdc = mdc,
71 .set_mdio_dir = mdio_dir,
72 .set_mdio_data = mdio,
73 .get_mdio_data = mdio_read,
74};
75
76static int __devinit mdio_ofgpio_bitbang_init(struct mii_bus *bus,
77 struct device_node *np)
78{
79 struct mdio_gpio_info *bitbang = bus->priv;
80
81 bitbang->mdc = of_get_gpio(np, 0);
82 bitbang->mdio = of_get_gpio(np, 1);
83
84 if (bitbang->mdc < 0 || bitbang->mdio < 0)
85 return -ENODEV;
86
87 snprintf(bus->id, MII_BUS_ID_SIZE, "%x", bitbang->mdc);
88 return 0;
89}
90
91static void __devinit add_phy(struct mii_bus *bus, struct device_node *np)
92{
93 const u32 *data;
94 int len, id, irq;
95
96 data = of_get_property(np, "reg", &len);
97 if (!data || len != 4)
98 return;
99
100 id = *data;
101 bus->phy_mask &= ~(1 << id);
102
103 irq = of_irq_to_resource(np, 0, NULL);
104 if (irq != NO_IRQ)
105 bus->irq[id] = irq;
106}
107
108static int __devinit mdio_ofgpio_probe(struct of_device *ofdev,
109 const struct of_device_id *match)
110{
111 struct device_node *np = NULL;
112 struct mii_bus *new_bus;
113 struct mdio_gpio_info *bitbang;
114 int ret = -ENOMEM;
115 int i;
116
117 bitbang = kzalloc(sizeof(struct mdio_gpio_info), GFP_KERNEL);
118 if (!bitbang)
119 goto out;
120
121 bitbang->ctrl.ops = &mdio_gpio_ops;
122
123 new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
124 if (!new_bus)
125 goto out_free_bitbang;
126
127 new_bus->name = "GPIO Bitbanged MII",
128
129 ret = mdio_ofgpio_bitbang_init(new_bus, ofdev->node);
130 if (ret)
131 goto out_free_bus;
132
133 new_bus->phy_mask = ~0;
134 new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
135 if (!new_bus->irq)
136 goto out_free_bus;
137
138 for (i = 0; i < PHY_MAX_ADDR; i++)
139 new_bus->irq[i] = -1;
140
141 while ((np = of_get_next_child(ofdev->node, np)))
142 if (!strcmp(np->type, "ethernet-phy"))
143 add_phy(new_bus, np);
144
145 new_bus->parent = &ofdev->dev;
146 dev_set_drvdata(&ofdev->dev, new_bus);
147
148 ret = mdiobus_register(new_bus);
149 if (ret)
150 goto out_free_irqs;
151
152 return 0;
153
154out_free_irqs:
155 dev_set_drvdata(&ofdev->dev, NULL);
156 kfree(new_bus->irq);
157out_free_bus:
158 free_mdio_bitbang(new_bus);
159out_free_bitbang:
160 kfree(bitbang);
161out:
162 return ret;
163}
164
165static int mdio_ofgpio_remove(struct of_device *ofdev)
166{
167 struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
168 struct mdio_gpio_info *bitbang = bus->priv;
169
170 mdiobus_unregister(bus);
171 kfree(bus->irq);
172 free_mdio_bitbang(bus);
173 dev_set_drvdata(&ofdev->dev, NULL);
174 kfree(bitbang);
175
176 return 0;
177}
178
179static struct of_device_id mdio_ofgpio_match[] = {
180 {
181 .compatible = "virtual,mdio-gpio",
182 },
183 {},
184};
185
186static struct of_platform_driver mdio_ofgpio_driver = {
187 .name = "mdio-gpio",
188 .match_table = mdio_ofgpio_match,
189 .probe = mdio_ofgpio_probe,
190 .remove = mdio_ofgpio_remove,
191};
192
193static int mdio_ofgpio_init(void)
194{
195 return of_register_platform_driver(&mdio_ofgpio_driver);
196}
197
198static void mdio_ofgpio_exit(void)
199{
200 of_unregister_platform_driver(&mdio_ofgpio_driver);
201}
202
203module_init(mdio_ofgpio_init);
204module_exit(mdio_ofgpio_exit);