aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/net/fs_enet/mii-bitbang.c
blob: 1620030cd33c92e7fd7044ea54c7f1d3c6442925 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
/*
 * Combined Ethernet driver for Motorola MPC8xx and MPC82xx.
 *
 * Copyright (c) 2003 Intracom S.A.
 *  by Pantelis Antoniou <panto@intracom.gr>
 *
 * 2005 (c) MontaVista Software, Inc.
 * Vitaly Bordug <vbordug@ru.mvista.com>
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

#include <linux/module.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/mii.h>
#include <linux/platform_device.h>
#include <linux/mdio-bitbang.h>

#ifdef CONFIG_PPC_CPM_NEW_BINDING
#include <linux/of_platform.h>
#endif

#include "fs_enet.h"

struct bb_info {
	struct mdiobb_ctrl ctrl;
	__be32 __iomem *dir;
	__be32 __iomem *dat;
	u32 mdio_msk;
	u32 mdc_msk;
};

/* FIXME: If any other users of GPIO crop up, then these will have to
 * have some sort of global synchronization to avoid races with other
 * pins on the same port.  The ideal solution would probably be to
 * bind the ports to a GPIO driver, and have this be a client of it.
 */
static inline void bb_set(u32 __iomem *p, u32 m)
{
	out_be32(p, in_be32(p) | m);
}

static inline void bb_clr(u32 __iomem *p, u32 m)
{
	out_be32(p, in_be32(p) & ~m);
}

static inline int bb_read(u32 __iomem *p, u32 m)
{
	return (in_be32(p) & m) != 0;
}

static inline void mdio_dir(struct mdiobb_ctrl *ctrl, int dir)
{
	struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);

	if (dir)
		bb_set(bitbang->dir, bitbang->mdio_msk);
	else
		bb_clr(bitbang->dir, bitbang->mdio_msk);

	/* Read back to flush the write. */
	in_be32(bitbang->dir);
}

static inline int mdio_read(struct mdiobb_ctrl *ctrl)
{
	struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);
	return bb_read(bitbang->dat, bitbang->mdio_msk);
}

static inline void mdio(struct mdiobb_ctrl *ctrl, int what)
{
	struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);

	if (what)
		bb_set(bitbang->dat, bitbang->mdio_msk);
	else
		bb_clr(bitbang->dat, bitbang->mdio_msk);

	/* Read back to flush the write. */
	in_be32(bitbang->dat);
}

static inline void mdc(struct mdiobb_ctrl *ctrl, int what)
{
	struct bb_info *bitbang = container_of(ctrl, struct bb_info, ctrl);

	if (what)
		bb_set(bitbang->dat, bitbang->mdc_msk);
	else
		bb_clr(bitbang->dat, bitbang->mdc_msk);

	/* Read back to flush the write. */
	in_be32(bitbang->dat);
}

static struct mdiobb_ops bb_ops = {
	.owner = THIS_MODULE,
	.set_mdc = mdc,
	.set_mdio_dir = mdio_dir,
	.set_mdio_data = mdio,
	.get_mdio_data = mdio_read,
};

#ifdef CONFIG_PPC_CPM_NEW_BINDING
static int __devinit fs_mii_bitbang_init(struct mii_bus *bus,
                                         struct device_node *np)
{
	struct resource res;
	const u32 *data;
	int mdio_pin, mdc_pin, len;
	struct bb_info *bitbang = bus->priv;

	int ret = of_address_to_resource(np, 0, &res);
	if (ret)
		return ret;

	if (res.end - res.start < 13)
		return -ENODEV;

	/* This should really encode the pin number as well, but all
	 * we get is an int, and the odds of multiple bitbang mdio buses
	 * is low enough that it's not worth going too crazy.
	 */
	snprintf(bus->id, MII_BUS_ID_SIZE, "%x", res.start);

	data = of_get_property(np, "fsl,mdio-pin", &len);
	if (!data || len != 4)
		return -ENODEV;
	mdio_pin = *data;

	data = of_get_property(np, "fsl,mdc-pin", &len);
	if (!data || len != 4)
		return -ENODEV;
	mdc_pin = *data;

	bitbang->dir = ioremap(res.start, res.end - res.start + 1);
	if (!bitbang->dir)
		return -ENOMEM;

	bitbang->dat = bitbang->dir + 4;
	bitbang->mdio_msk = 1 << (31 - mdio_pin);
	bitbang->mdc_msk = 1 << (31 - mdc_pin);

	return 0;
}

static void __devinit add_phy(struct mii_bus *bus, struct device_node *np)
{
	const u32 *data;
	int len, id, irq;

	data = of_get_property(np, "reg", &len);
	if (!data || len != 4)
		return;

	id = *data;
	bus->phy_mask &= ~(1 << id);

	irq = of_irq_to_resource(np, 0, NULL);
	if (irq != NO_IRQ)
		bus->irq[id] = irq;
}

static int __devinit fs_enet_mdio_probe(struct of_device *ofdev,
                                        const struct of_device_id *match)
{
	struct device_node *np = NULL;
	struct mii_bus *new_bus;
	struct bb_info *bitbang;
	int ret = -ENOMEM;
	int i;

	bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL);
	if (!bitbang)
		goto out;

	bitbang->ctrl.ops = &bb_ops;

	new_bus = alloc_mdio_bitbang(&bitbang->ctrl);
	if (!new_bus)
		goto out_free_priv;

	new_bus->name = "CPM2 Bitbanged MII",

	ret = fs_mii_bitbang_init(new_bus, ofdev->node);
	if (ret)
		goto out_free_bus;

	new_bus->phy_mask = ~0;
	new_bus->irq = kmalloc(sizeof(int) * PHY_MAX_ADDR, GFP_KERNEL);
	if (!new_bus->irq)
		goto out_unmap_regs;

	for (i = 0; i < PHY_MAX_ADDR; i++)
		new_bus->irq[i] = -1;

	while ((np = of_get_next_child(ofdev->node, np)))
		if (!strcmp(np->type, "ethernet-phy"))
			add_phy(new_bus, np);

	new_bus->dev = &ofdev->dev;
	dev_set_drvdata(&ofdev->dev, new_bus);

	ret = mdiobus_register(new_bus);
	if (ret)
		goto out_free_irqs;

	return 0;

out_free_irqs:
	dev_set_drvdata(&ofdev->dev, NULL);
	kfree(new_bus->irq);
out_unmap_regs:
	iounmap(bitbang->dir);
out_free_bus:
	kfree(new_bus);
out_free_priv:
	free_mdio_bitbang(new_bus);
out:
	return ret;
}

static int fs_enet_mdio_remove(struct of_device *ofdev)
{
	struct mii_bus *bus = dev_get_drvdata(&ofdev->dev);
	struct bb_info *bitbang = bus->priv;

	mdiobus_unregister(bus);
	free_mdio_bitbang(bus);
	dev_set_drvdata(&ofdev->dev, NULL);
	kfree(bus->irq);
	iounmap(bitbang->dir);
	kfree(bitbang);
	kfree(bus);

	return 0;
}

static struct of_device_id fs_enet_mdio_bb_match[] = {
	{
		.compatible = "fsl,cpm2-mdio-bitbang",
	},
	{},
};

static struct of_platform_driver fs_enet_bb_mdio_driver = {
	.name = "fsl-bb-mdio",
	.match_table = fs_enet_mdio_bb_match,
	.probe = fs_enet_mdio_probe,
	.remove = fs_enet_mdio_remove,
};

static int fs_enet_mdio_bb_init(void)
{
	return of_register_platform_driver(&fs_enet_bb_mdio_driver);
}

static void fs_enet_mdio_bb_exit(void)
{
	of_unregister_platform_driver(&fs_enet_bb_mdio_driver);
}

module_init(fs_enet_mdio_bb_init);
module_exit(fs_enet_mdio_bb_exit);
#else
static int __devinit fs_mii_bitbang_init(struct bb_info *bitbang,
                                         struct fs_mii_bb_platform_info *fmpi)
{
	bitbang->dir = (u32 __iomem *)fmpi->mdio_dir.offset;
	bitbang->dat = (u32 __iomem *)fmpi->mdio_dat.offset;
	bitbang->mdio_msk = 1U << (31 - fmpi->mdio_dat.bit);
	bitbang->mdc_msk = 1U << (31 - fmpi->mdc_dat.bit);

	return 0;
}

static int __devinit fs_enet_mdio_probe(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct fs_mii_bb_platform_info *pdata;
	struct mii_bus *new_bus;
	struct bb_info *bitbang;
	int err = 0;

	if (NULL == dev)
		return -EINVAL;

	bitbang = kzalloc(sizeof(struct bb_info), GFP_KERNEL);

	if (NULL == bitbang)
		return -ENOMEM;

	bitbang->ctrl.ops = &bb_ops;

	new_bus = alloc_mdio_bitbang(&bitbang->ctrl);

	if (NULL == new_bus)
		return -ENOMEM;

	new_bus->name = "BB MII Bus",
	snprintf(new_bus->id, MII_BUS_ID_SIZE, "%x", pdev->id);

	new_bus->phy_mask = ~0x9;
	pdata = (struct fs_mii_bb_platform_info *)pdev->dev.platform_data;

	if (NULL == pdata) {
		printk(KERN_ERR "gfar mdio %d: Missing platform data!\n", pdev->id);
		return -ENODEV;
	}

	/*set up workspace*/
	fs_mii_bitbang_init(bitbang, pdata);

	new_bus->priv = bitbang;

	new_bus->irq = pdata->irq;

	new_bus->dev = dev;
	dev_set_drvdata(dev, new_bus);

	err = mdiobus_register(new_bus);

	if (0 != err) {
		printk (KERN_ERR "%s: Cannot register as MDIO bus\n",
				new_bus->name);
		goto bus_register_fail;
	}

	return 0;

bus_register_fail:
	free_mdio_bitbang(new_bus);
	kfree(bitbang);

	return err;
}

static int fs_enet_mdio_remove(struct device *dev)
{
	struct mii_bus *bus = dev_get_drvdata(dev);

	mdiobus_unregister(bus);

	dev_set_drvdata(dev, NULL);

	free_mdio_bitbang(bus);

	return 0;
}

static struct device_driver fs_enet_bb_mdio_driver = {
	.name = "fsl-bb-mdio",
	.bus = &platform_bus_type,
	.probe = fs_enet_mdio_probe,
	.remove = fs_enet_mdio_remove,
};

int fs_enet_mdio_bb_init(void)
{
	return driver_register(&fs_enet_bb_mdio_driver);
}

void fs_enet_mdio_bb_exit(void)
{
	driver_unregister(&fs_enet_bb_mdio_driver);
}
#endif