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>
26 #ifdef CONFIG_PPC_CPM_NEW_BINDING
27 #include <linux/of_platform.h>
33 struct mdiobb_ctrl ctrl;
40 /* FIXME: If any other users of GPIO crop up, then these will have to
41 * have some sort of global synchronization to avoid races with other
42 * pins on the same port. The ideal solution would probably be to
43 * bind the ports to a GPIO driver, and have this be a client of it.
45 static inline void bb_set(u32 __iomem *p, u32 m)
47 out_be32(p, in_be32(p) | m);
50 static inline void bb_clr(u32 __iomem *p, u32 m)
52 out_be32(p, in_be32(p) & ~m);
55 static inline int bb_read(u32 __iomem *p, u32 m)
57 return (in_be32(p) & m) != 0;
60 static inline void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
62 struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
65 bb_set(bitbang->dir, bitbang->mdio_msk);
67 bb_clr(bitbang->dir, bitbang->mdio_msk);
69 /* Read back to flush the write. */
70 in_be32(bitbang->dir);
73 static inline int mdio_read(struct mdiobb_ctrl *ctrl)
75 struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
76 return bb_read(bitbang->dat, bitbang->mdio_msk);
79 static inline void mdio(struct mdiobb_ctrl *ctrl, int what)
81 struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
84 bb_set(bitbang->dat, bitbang->mdio_msk);
86 bb_clr(bitbang->dat, bitbang->mdio_msk);
88 /* Read back to flush the write. */
89 in_be32(bitbang->dat);
92 static inline void mdc(struct mdiobb_ctrl *ctrl, int what)
94 struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
97 bb_set(bitbang->dat, bitbang->mdc_msk);
99 bb_clr(bitbang->dat, bitbang->mdc_msk);
101 /* Read back to flush the write. */
102 in_be32(bitbang->dat);
105 static struct mdiobb_ops bb_ops = {
106 .owner = THIS_MODULE,
108 .set_mdio_dir = mdio_dir,
109 .set_mdio_data = mdio,
110 .get_mdio_data = mdio_read,
113 #ifdef CONFIG_PPC_CPM_NEW_BINDING
114 static int __devinit fs_mii_bitbang_init(struct mii_bus *bus,
115 struct device_node *np)
119 int mdio_pin, mdc_pin, len;
120 struct bb_info *bitbang = bus->priv;
122 int ret = of_address_to_resource(np, 0, &res);
126 if (res.end - res.start < 13)
129 /* This should really encode the pin number as well, but all
130 * we get is an int, and the odds of multiple bitbang mdio buses
131 * is low enough that it's not worth going too crazy.
133 snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
135 data = of_get_property(np, "fsl,mdio-pin", &len);
136 if (!data || len != 4)
140 data = of_get_property(np, "fsl,mdc-pin", &len);
141 if (!data || len != 4)
145 bitbang->dir = ioremap(res.start, res.end - res.start + 1);
149 bitbang->dat = bitbang->dir + 4;
150 bitbang->mdio_msk = 1 << (31 - mdio_pin);
151 bitbang->mdc_msk = 1 << (31 - mdc_pin);
156 static void __devinit add_phy(struct mii_bus *bus, struct device_node *np)
161 data = of_get_property(np, "reg", &len);
162 if (!data || len != 4)
166 bus->phy_mask &= ~(1 << id);
168 irq = of_irq_to_resource(np, 0, NULL);
173 static int __devinit fs_enet_mdio_probe(struct of_device *ofdev,
174 const struct of_device_id *match)
176 struct device_node *np = NULL;
177 struct mii_bus *new_bus;
178 struct bb_info *bitbang;
182 bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL);
186 bitbang->ctrl.ops = &bb_ops;
188 new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
192 new_bus->name = "CPM2 Bitbanged MII",
194 ret = fs_mii_bitbang_init(new_bus, ofdev->node);
198 new_bus->phy_mask = ~0;
199 new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
203 for (i = 0; i < PHY_MAX_ADDR; i++)
204 new_bus->irq[i] = -1;
206 while ((np = of_get_next_child(ofdev->node, np)))
207 if (!strcmp(np->type, "ethernet-phy"))
208 add_phy(new_bus, np);
210 new_bus->dev = &ofdev->dev;
211 dev_set_drvdata(&ofdev->dev, new_bus);
213 ret = mdiobus_register(new_bus);
220 dev_set_drvdata(&ofdev->dev, NULL);
223 iounmap(bitbang->dir);
227 free_mdio_bitbang(new_bus);
232 static int fs_enet_mdio_remove(struct of_device *ofdev)
234 struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
235 struct bb_info *bitbang = bus->priv;
237 mdiobus_unregister(bus);
238 free_mdio_bitbang(bus);
239 dev_set_drvdata(&ofdev->dev, NULL);
241 iounmap(bitbang->dir);
248 static struct of_device_id fs_enet_mdio_bb_match[] = {
250 .compatible = "fsl,cpm2-mdio-bitbang",
255 static struct of_platform_driver fs_enet_bb_mdio_driver = {
256 .name = "fsl-bb-mdio",
257 .match_table = fs_enet_mdio_bb_match,
258 .probe = fs_enet_mdio_probe,
259 .remove = fs_enet_mdio_remove,
262 static int fs_enet_mdio_bb_init(void)
264 return of_register_platform_driver(&fs_enet_bb_mdio_driver);
267 static void fs_enet_mdio_bb_exit(void)
269 of_unregister_platform_driver(&fs_enet_bb_mdio_driver);
272 module_init(fs_enet_mdio_bb_init);
273 module_exit(fs_enet_mdio_bb_exit);
275 static int __devinit fs_mii_bitbang_init(struct bb_info *bitbang,
276 struct fs_mii_bb_platform_info *fmpi)
278 bitbang->dir = (u32 __iomem *)fmpi->mdio_dir.offset;
279 bitbang->dat = (u32 __iomem *)fmpi->mdio_dat.offset;
280 bitbang->mdio_msk = 1U << (31 - fmpi->mdio_dat.bit);
281 bitbang->mdc_msk = 1U << (31 - fmpi->mdc_dat.bit);
286 static int __devinit fs_enet_mdio_probe(struct device *dev)
288 struct platform_device *pdev = to_platform_device(dev);
289 struct fs_mii_bb_platform_info *pdata;
290 struct mii_bus *new_bus;
291 struct bb_info *bitbang;
297 bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL);
302 bitbang->ctrl.ops = &bb_ops;
304 new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
309 new_bus->name = "BB MII Bus",
310 snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", pdev->id);
312 new_bus->phy_mask = ~0x9;
313 pdata = (struct fs_mii_bb_platform_info *)pdev->dev.platform_data;
316 printk(KERN_ERR "gfar mdio %d: Missing platform data!\n", pdev->id);
321 fs_mii_bitbang_init(bitbang, pdata);
323 new_bus->priv = bitbang;
325 new_bus->irq = pdata->irq;
328 dev_set_drvdata(dev, new_bus);
330 err = mdiobus_register(new_bus);
333 printk (KERN_ERR "%s: Cannot register as MDIO bus\n",
335 goto bus_register_fail;
341 free_mdio_bitbang(new_bus);
347 static int fs_enet_mdio_remove(struct device *dev)
349 struct mii_bus *bus = dev_get_drvdata(dev);
351 mdiobus_unregister(bus);
353 dev_set_drvdata(dev, NULL);
355 free_mdio_bitbang(bus);
360 static struct device_driver fs_enet_bb_mdio_driver = {
361 .name = "fsl-bb-mdio",
362 .bus = &platform_bus_type,
363 .probe = fs_enet_mdio_probe,
364 .remove = fs_enet_mdio_remove,
367 int fs_enet_mdio_bb_init(void)
369 return driver_register(&fs_enet_bb_mdio_driver);
372 void fs_enet_mdio_bb_exit(void)
374 driver_unregister(&fs_enet_bb_mdio_driver);