2 * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
4 * Copyright (c) 2003 Intracom S.A.
5 * by Pantelis Antoniou <panto@intracom.gr>
7 * 2005 (c) MontaVista Software, Inc.
8 * Vitaly Bordug <vbordug@ru.mvista.com>
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.
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_platform.h>
30 struct mdiobb_ctrl ctrl;
37 /* FIXME: If any other users of GPIO crop up, then these will have to
38 * have some sort of global synchronization to avoid races with other
39 * pins on the same port. The ideal solution would probably be to
40 * bind the ports to a GPIO driver, and have this be a client of it.
42 static inline void bb_set(u32 __iomem *p, u32 m)
44 out_be32(p, in_be32(p) | m);
47 static inline void bb_clr(u32 __iomem *p, u32 m)
49 out_be32(p, in_be32(p) & ~m);
52 static inline int bb_read(u32 __iomem *p, u32 m)
54 return (in_be32(p) & m) != 0;
57 static inline void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
59 struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
62 bb_set(bitbang->dir, bitbang->mdio_msk);
64 bb_clr(bitbang->dir, bitbang->mdio_msk);
66 /* Read back to flush the write. */
67 in_be32(bitbang->dir);
70 static inline int mdio_read(struct mdiobb_ctrl *ctrl)
72 struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
73 return bb_read(bitbang->dat, bitbang->mdio_msk);
76 static inline void mdio(struct mdiobb_ctrl *ctrl, int what)
78 struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
81 bb_set(bitbang->dat, bitbang->mdio_msk);
83 bb_clr(bitbang->dat, bitbang->mdio_msk);
85 /* Read back to flush the write. */
86 in_be32(bitbang->dat);
89 static inline void mdc(struct mdiobb_ctrl *ctrl, int what)
91 struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
94 bb_set(bitbang->dat, bitbang->mdc_msk);
96 bb_clr(bitbang->dat, bitbang->mdc_msk);
98 /* Read back to flush the write. */
99 in_be32(bitbang->dat);
102 static struct mdiobb_ops bb_ops = {
103 .owner = THIS_MODULE,
105 .set_mdio_dir = mdio_dir,
106 .set_mdio_data = mdio,
107 .get_mdio_data = mdio_read,
110 static int __devinit fs_mii_bitbang_init(struct mii_bus *bus,
111 struct device_node *np)
115 int mdio_pin, mdc_pin, len;
116 struct bb_info *bitbang = bus->priv;
118 int ret = of_address_to_resource(np, 0, &res);
122 if (res.end - res.start < 13)
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.
129 snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
131 data = of_get_property(np, "fsl,mdio-pin", &len);
132 if (!data || len != 4)
136 data = of_get_property(np, "fsl,mdc-pin", &len);
137 if (!data || len != 4)
141 bitbang->dir = ioremap(res.start, res.end - res.start + 1);
145 bitbang->dat = bitbang->dir + 4;
146 bitbang->mdio_msk = 1 << (31 - mdio_pin);
147 bitbang->mdc_msk = 1 << (31 - mdc_pin);
152 static void __devinit add_phy(struct mii_bus *bus, struct device_node *np)
157 data = of_get_property(np, "reg", &len);
158 if (!data || len != 4)
162 bus->phy_mask &= ~(1 << id);
164 irq = of_irq_to_resource(np, 0, NULL);
169 static int __devinit fs_enet_mdio_probe(struct of_device *ofdev,
170 const struct of_device_id *match)
172 struct device_node *np = NULL;
173 struct mii_bus *new_bus;
174 struct bb_info *bitbang;
178 bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL);
182 bitbang->ctrl.ops = &bb_ops;
184 new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
188 new_bus->name = "CPM2 Bitbanged MII",
190 ret = fs_mii_bitbang_init(new_bus, ofdev->node);
194 new_bus->phy_mask = ~0;
195 new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
199 for (i = 0; i < PHY_MAX_ADDR; i++)
200 new_bus->irq[i] = -1;
202 while ((np = of_get_next_child(ofdev->node, np)))
203 if (!strcmp(np->type, "ethernet-phy"))
204 add_phy(new_bus, np);
206 new_bus->parent = &ofdev->dev;
207 dev_set_drvdata(&ofdev->dev, new_bus);
209 ret = mdiobus_register(new_bus);
216 dev_set_drvdata(&ofdev->dev, NULL);
219 iounmap(bitbang->dir);
221 free_mdio_bitbang(new_bus);
228 static int fs_enet_mdio_remove(struct of_device *ofdev)
230 struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
231 struct bb_info *bitbang = bus->priv;
233 mdiobus_unregister(bus);
234 dev_set_drvdata(&ofdev->dev, NULL);
236 free_mdio_bitbang(bus);
237 iounmap(bitbang->dir);
243 static struct of_device_id fs_enet_mdio_bb_match[] = {
245 .compatible = "fsl,cpm2-mdio-bitbang",
250 static struct of_platform_driver fs_enet_bb_mdio_driver = {
251 .name = "fsl-bb-mdio",
252 .match_table = fs_enet_mdio_bb_match,
253 .probe = fs_enet_mdio_probe,
254 .remove = fs_enet_mdio_remove,
257 static int fs_enet_mdio_bb_init(void)
259 return of_register_platform_driver(&fs_enet_bb_mdio_driver);
262 static void fs_enet_mdio_bb_exit(void)
264 of_unregister_platform_driver(&fs_enet_bb_mdio_driver);
267 module_init(fs_enet_mdio_bb_init);
268 module_exit(fs_enet_mdio_bb_exit);