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Pantelis Antoniou48257c42005-10-28 16:25:58 -04001/*
2 * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
3 *
Vitaly Bordug9b8ee8e2007-09-18 20:05:35 +04004 * Copyright (c) 2003 Intracom S.A.
Pantelis Antoniou48257c42005-10-28 16:25:58 -04005 * by Pantelis Antoniou <panto@intracom.gr>
Vitaly Bordug9b8ee8e2007-09-18 20:05:35 +04006 *
7 * 2005 (c) MontaVista Software, Inc.
Pantelis Antoniou48257c42005-10-28 16:25:58 -04008 * Vitaly Bordug <vbordug@ru.mvista.com>
9 *
Vitaly Bordug9b8ee8e2007-09-18 20:05:35 +040010 * 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
Pantelis Antoniou48257c42005-10-28 16:25:58 -040012 * kind, whether express or implied.
13 */
14
Pantelis Antoniou48257c42005-10-28 16:25:58 -040015#include <linux/module.h>
Pantelis Antoniou48257c42005-10-28 16:25:58 -040016#include <linux/ioport.h>
17#include <linux/slab.h>
Pantelis Antoniou48257c42005-10-28 16:25:58 -040018#include <linux/init.h>
Scott Wood2b5b3a62007-10-01 14:20:57 -050019#include <linux/interrupt.h>
Pantelis Antoniou48257c42005-10-28 16:25:58 -040020#include <linux/netdevice.h>
21#include <linux/etherdevice.h>
Pantelis Antoniou48257c42005-10-28 16:25:58 -040022#include <linux/mii.h>
Vitaly Bordug5b4b8452006-08-14 23:00:30 -070023#include <linux/platform_device.h>
Scott Wood2b5b3a62007-10-01 14:20:57 -050024#include <linux/mdio-bitbang.h>
Scott Wood976de6a2007-10-02 10:55:58 -050025#include <linux/of_platform.h>
Pantelis Antoniou48257c42005-10-28 16:25:58 -040026
27#include "fs_enet.h"
28
Scott Wood976de6a2007-10-02 10:55:58 -050029struct bb_info {
Scott Wood2b5b3a62007-10-01 14:20:57 -050030 struct mdiobb_ctrl ctrl;
Scott Wood976de6a2007-10-02 10:55:58 -050031 __be32 __iomem *dir;
32 __be32 __iomem *dat;
33 u32 mdio_msk;
34 u32 mdc_msk;
Scott Wood976de6a2007-10-02 10:55:58 -050035};
36
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.
41 */
42static inline void bb_set(u32 __iomem *p, u32 m)
Pantelis Antoniou48257c42005-10-28 16:25:58 -040043{
Scott Wood976de6a2007-10-02 10:55:58 -050044 out_be32(p, in_be32(p) | m);
Pantelis Antoniou48257c42005-10-28 16:25:58 -040045}
Pantelis Antoniou48257c42005-10-28 16:25:58 -040046
Scott Wood976de6a2007-10-02 10:55:58 -050047static inline void bb_clr(u32 __iomem *p, u32 m)
Pantelis Antoniou48257c42005-10-28 16:25:58 -040048{
Scott Wood976de6a2007-10-02 10:55:58 -050049 out_be32(p, in_be32(p) & ~m);
Pantelis Antoniou48257c42005-10-28 16:25:58 -040050}
51
Scott Wood976de6a2007-10-02 10:55:58 -050052static inline int bb_read(u32 __iomem *p, u32 m)
Pantelis Antoniou48257c42005-10-28 16:25:58 -040053{
Scott Wood976de6a2007-10-02 10:55:58 -050054 return (in_be32(p) & m) != 0;
Pantelis Antoniou48257c42005-10-28 16:25:58 -040055}
56
Scott Wood2b5b3a62007-10-01 14:20:57 -050057static inline void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
Pantelis Antoniou48257c42005-10-28 16:25:58 -040058{
Scott Wood2b5b3a62007-10-01 14:20:57 -050059 struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
60
61 if (dir)
62 bb_set(bitbang->dir, bitbang->mdio_msk);
63 else
64 bb_clr(bitbang->dir, bitbang->mdio_msk);
65
66 /* Read back to flush the write. */
67 in_be32(bitbang->dir);
Pantelis Antoniou48257c42005-10-28 16:25:58 -040068}
69
Scott Wood2b5b3a62007-10-01 14:20:57 -050070static inline int mdio_read(struct mdiobb_ctrl *ctrl)
Pantelis Antoniou48257c42005-10-28 16:25:58 -040071{
Scott Wood2b5b3a62007-10-01 14:20:57 -050072 struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
Scott Wood976de6a2007-10-02 10:55:58 -050073 return bb_read(bitbang->dat, bitbang->mdio_msk);
Pantelis Antoniou48257c42005-10-28 16:25:58 -040074}
75
Scott Wood2b5b3a62007-10-01 14:20:57 -050076static inline void mdio(struct mdiobb_ctrl *ctrl, int what)
Pantelis Antoniou48257c42005-10-28 16:25:58 -040077{
Scott Wood2b5b3a62007-10-01 14:20:57 -050078 struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
79
Pantelis Antoniou48257c42005-10-28 16:25:58 -040080 if (what)
Scott Wood976de6a2007-10-02 10:55:58 -050081 bb_set(bitbang->dat, bitbang->mdio_msk);
Pantelis Antoniou48257c42005-10-28 16:25:58 -040082 else
Scott Wood976de6a2007-10-02 10:55:58 -050083 bb_clr(bitbang->dat, bitbang->mdio_msk);
Scott Wood2b5b3a62007-10-01 14:20:57 -050084
85 /* Read back to flush the write. */
86 in_be32(bitbang->dat);
Pantelis Antoniou48257c42005-10-28 16:25:58 -040087}
88
Scott Wood2b5b3a62007-10-01 14:20:57 -050089static inline void mdc(struct mdiobb_ctrl *ctrl, int what)
Pantelis Antoniou48257c42005-10-28 16:25:58 -040090{
Scott Wood2b5b3a62007-10-01 14:20:57 -050091 struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
92
Pantelis Antoniou48257c42005-10-28 16:25:58 -040093 if (what)
Scott Wood976de6a2007-10-02 10:55:58 -050094 bb_set(bitbang->dat, bitbang->mdc_msk);
Pantelis Antoniou48257c42005-10-28 16:25:58 -040095 else
Scott Wood976de6a2007-10-02 10:55:58 -050096 bb_clr(bitbang->dat, bitbang->mdc_msk);
Scott Wood2b5b3a62007-10-01 14:20:57 -050097
98 /* Read back to flush the write. */
99 in_be32(bitbang->dat);
Pantelis Antoniou48257c42005-10-28 16:25:58 -0400100}
101
Scott Wood2b5b3a62007-10-01 14:20:57 -0500102static struct mdiobb_ops bb_ops = {
103 .owner = THIS_MODULE,
104 .set_mdc = mdc,
105 .set_mdio_dir = mdio_dir,
106 .set_mdio_data = mdio,
107 .get_mdio_data = mdio_read,
108};
Vitaly Bordug5b4b8452006-08-14 23:00:30 -0700109
Scott Wood976de6a2007-10-02 10:55:58 -0500110static int __devinit fs_mii_bitbang_init(struct mii_bus *bus,
111 struct device_node *np)
Vitaly Bordug5b4b8452006-08-14 23:00:30 -0700112{
Scott Wood976de6a2007-10-02 10:55:58 -0500113 struct resource res;
114 const u32 *data;
115 int mdio_pin, mdc_pin, len;
116 struct bb_info *bitbang = bus->priv;
Pantelis Antoniou48257c42005-10-28 16:25:58 -0400117
Scott Wood976de6a2007-10-02 10:55:58 -0500118 int ret = of_address_to_resource(np, 0, &res);
119 if (ret)
120 return ret;
121
122 if (res.end - res.start < 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 */
Andy Fleming9d9326d2008-04-09 19:38:13 -0500129 snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);
Scott Wood976de6a2007-10-02 10:55:58 -0500130
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, res.end - res.start + 1);
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);
Scott Wood976de6a2007-10-02 10:55:58 -0500148
149 return 0;
150}
151
152static void __devinit add_phy(struct mii_bus *bus, struct device_node *np)
153{
154 const u32 *data;
155 int len, id, irq;
156
157 data = of_get_property(np, "reg", &len);
158 if (!data || len != 4)
159 return;
160
161 id = *data;
162 bus->phy_mask &= ~(1 << id);
163
164 irq = of_irq_to_resource(np, 0, NULL);
165 if (irq != NO_IRQ)
166 bus->irq[id] = irq;
167}
168
169static int __devinit fs_enet_mdio_probe(struct of_device *ofdev,
170 const struct of_device_id *match)
171{
172 struct device_node *np = NULL;
173 struct mii_bus *new_bus;
174 struct bb_info *bitbang;
175 int ret = -ENOMEM;
176 int i;
177
Scott Wood976de6a2007-10-02 10:55:58 -0500178 bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL);
179 if (!bitbang)
Scott Wood2b5b3a62007-10-01 14:20:57 -0500180 goto out;
Scott Wood976de6a2007-10-02 10:55:58 -0500181
Scott Wood2b5b3a62007-10-01 14:20:57 -0500182 bitbang->ctrl.ops = &bb_ops;
183
184 new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
185 if (!new_bus)
186 goto out_free_priv;
187
Scott Wood976de6a2007-10-02 10:55:58 -0500188 new_bus->name = "CPM2 Bitbanged MII",
Scott Wood976de6a2007-10-02 10:55:58 -0500189
190 ret = fs_mii_bitbang_init(new_bus, ofdev->node);
191 if (ret)
Scott Wood2b5b3a62007-10-01 14:20:57 -0500192 goto out_free_bus;
Scott Wood976de6a2007-10-02 10:55:58 -0500193
194 new_bus->phy_mask = ~0;
195 new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
196 if (!new_bus->irq)
197 goto out_unmap_regs;
198
199 for (i = 0; i < PHY_MAX_ADDR; i++)
200 new_bus->irq[i] = -1;
201
202 while ((np = of_get_next_child(ofdev->node, np)))
203 if (!strcmp(np->type, "ethernet-phy"))
204 add_phy(new_bus, np);
205
206 new_bus->dev = &ofdev->dev;
207 dev_set_drvdata(&ofdev->dev, new_bus);
208
209 ret = mdiobus_register(new_bus);
210 if (ret)
211 goto out_free_irqs;
212
213 return 0;
214
215out_free_irqs:
216 dev_set_drvdata(&ofdev->dev, NULL);
217 kfree(new_bus->irq);
218out_unmap_regs:
219 iounmap(bitbang->dir);
Scott Wood976de6a2007-10-02 10:55:58 -0500220out_free_bus:
221 kfree(new_bus);
Scott Wood2b5b3a62007-10-01 14:20:57 -0500222out_free_priv:
223 free_mdio_bitbang(new_bus);
Scott Wood976de6a2007-10-02 10:55:58 -0500224out:
225 return ret;
226}
227
228static int fs_enet_mdio_remove(struct of_device *ofdev)
229{
230 struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
231 struct bb_info *bitbang = bus->priv;
232
233 mdiobus_unregister(bus);
Scott Wood2b5b3a62007-10-01 14:20:57 -0500234 free_mdio_bitbang(bus);
Scott Wood976de6a2007-10-02 10:55:58 -0500235 dev_set_drvdata(&ofdev->dev, NULL);
236 kfree(bus->irq);
237 iounmap(bitbang->dir);
238 kfree(bitbang);
239 kfree(bus);
240
241 return 0;
242}
243
244static struct of_device_id fs_enet_mdio_bb_match[] = {
245 {
246 .compatible = "fsl,cpm2-mdio-bitbang",
247 },
248 {},
249};
250
251static struct of_platform_driver fs_enet_bb_mdio_driver = {
252 .name = "fsl-bb-mdio",
253 .match_table = fs_enet_mdio_bb_match,
254 .probe = fs_enet_mdio_probe,
255 .remove = fs_enet_mdio_remove,
256};
257
Scott Wood2b5b3a62007-10-01 14:20:57 -0500258static int fs_enet_mdio_bb_init(void)
Scott Wood976de6a2007-10-02 10:55:58 -0500259{
260 return of_register_platform_driver(&fs_enet_bb_mdio_driver);
261}
262
Scott Wood2b5b3a62007-10-01 14:20:57 -0500263static void fs_enet_mdio_bb_exit(void)
Scott Wood976de6a2007-10-02 10:55:58 -0500264{
265 of_unregister_platform_driver(&fs_enet_bb_mdio_driver);
266}
267
268module_init(fs_enet_mdio_bb_init);
269module_exit(fs_enet_mdio_bb_exit);