aboutsummaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/ibm/emac/zmii.c
blob: 415e9b4d54086ce6e7e8a2afdeeb2ea1582a2f10 (plain)
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
/*
 * drivers/net/ethernet/ibm/emac/zmii.c
 *
 * Driver for PowerPC 4xx on-chip ethernet controller, ZMII bridge support.
 *
 * Copyright 2007 Benjamin Herrenschmidt, IBM Corp.
 *                <benh@kernel.crashing.org>
 *
 * Based on the arch/ppc version of the driver:
 *
 * Copyright (c) 2004, 2005 Zultys Technologies.
 * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
 *
 * Based on original work by
 *      Armin Kuster <akuster@mvista.com>
 * 	Copyright 2001 MontaVista Softare Inc.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 *
 */
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/ethtool.h>
#include <asm/io.h>

#include "emac.h"
#include "core.h"

/* ZMIIx_FER */
#define ZMII_FER_MDI(idx)	(0x80000000 >> ((idx) * 4))
#define ZMII_FER_MDI_ALL	(ZMII_FER_MDI(0) | ZMII_FER_MDI(1) | \
				 ZMII_FER_MDI(2) | ZMII_FER_MDI(3))

#define ZMII_FER_SMII(idx)	(0x40000000 >> ((idx) * 4))
#define ZMII_FER_RMII(idx)	(0x20000000 >> ((idx) * 4))
#define ZMII_FER_MII(idx)	(0x10000000 >> ((idx) * 4))

/* ZMIIx_SSR */
#define ZMII_SSR_SCI(idx)	(0x40000000 >> ((idx) * 4))
#define ZMII_SSR_FSS(idx)	(0x20000000 >> ((idx) * 4))
#define ZMII_SSR_SP(idx)	(0x10000000 >> ((idx) * 4))

/* ZMII only supports MII, RMII and SMII
 * we also support autodetection for backward compatibility
 */
static inline int zmii_valid_mode(int mode)
{
	return  mode == PHY_MODE_MII ||
		mode == PHY_MODE_RMII ||
		mode == PHY_MODE_SMII ||
		mode == PHY_MODE_NA;
}

static inline const char *zmii_mode_name(int mode)
{
	switch (mode) {
	case PHY_MODE_MII:
		return "MII";
	case PHY_MODE_RMII:
		return "RMII";
	case PHY_MODE_SMII:
		return "SMII";
	default:
		BUG();
	}
}

static inline u32 zmii_mode_mask(int mode, int input)
{
	switch (mode) {
	case PHY_MODE_MII:
		return ZMII_FER_MII(input);
	case PHY_MODE_RMII:
		return ZMII_FER_RMII(input);
	case PHY_MODE_SMII:
		return ZMII_FER_SMII(input);
	default:
		return 0;
	}
}

int __devinit zmii_attach(struct platform_device *ofdev, int input, int *mode)
{
	struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
	struct zmii_regs __iomem *p = dev->base;

	ZMII_DBG(dev, "init(%d, %d)" NL, input, *mode);

	if (!zmii_valid_mode(*mode)) {
		/* Probably an EMAC connected to RGMII,
		 * but it still may need ZMII for MDIO so
		 * we don't fail here.
		 */
		dev->users++;
		return 0;
	}

	mutex_lock(&dev->lock);

	/* Autodetect ZMII mode if not specified.
	 * This is only for backward compatibility with the old driver.
	 * Please, always specify PHY mode in your board port to avoid
	 * any surprises.
	 */
	if (dev->mode == PHY_MODE_NA) {
		if (*mode == PHY_MODE_NA) {
			u32 r = dev->fer_save;

			ZMII_DBG(dev, "autodetecting mode, FER = 0x%08x" NL, r);

			if (r & (ZMII_FER_MII(0) | ZMII_FER_MII(1)))
				dev->mode = PHY_MODE_MII;
			else if (r & (ZMII_FER_RMII(0) | ZMII_FER_RMII(1)))
				dev->mode = PHY_MODE_RMII;
			else
				dev->mode = PHY_MODE_SMII;
		} else
			dev->mode = *mode;

		printk(KERN_NOTICE "%s: bridge in %s mode\n",
		       ofdev->dev.of_node->full_name,
		       zmii_mode_name(dev->mode));
	} else {
		/* All inputs must use the same mode */
		if (*mode != PHY_MODE_NA && *mode != dev->mode) {
			printk(KERN_ERR
			       "%s: invalid mode %d specified for input %d\n",
			       ofdev->dev.of_node->full_name, *mode, input);
			mutex_unlock(&dev->lock);
			return -EINVAL;
		}
	}

	/* Report back correct PHY mode,
	 * it may be used during PHY initialization.
	 */
	*mode = dev->mode;

	/* Enable this input */
	out_be32(&p->fer, in_be32(&p->fer) | zmii_mode_mask(dev->mode, input));
	++dev->users;

	mutex_unlock(&dev->lock);

	return 0;
}

void zmii_get_mdio(struct platform_device *ofdev, int input)
{
	struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
	u32 fer;

	ZMII_DBG2(dev, "get_mdio(%d)" NL, input);

	mutex_lock(&dev->lock);

	fer = in_be32(&dev->base->fer) & ~ZMII_FER_MDI_ALL;
	out_be32(&dev->base->fer, fer | ZMII_FER_MDI(input));
}

void zmii_put_mdio(struct platform_device *ofdev, int input)
{
	struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);

	ZMII_DBG2(dev, "put_mdio(%d)" NL, input);
	mutex_unlock(&dev->lock);
}


void zmii_set_speed(struct platform_device *ofdev, int input, int speed)
{
	struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
	u32 ssr;

	mutex_lock(&dev->lock);

	ssr = in_be32(&dev->base->ssr);

	ZMII_DBG(dev, "speed(%d, %d)" NL, input, speed);

	if (speed == SPEED_100)
		ssr |= ZMII_SSR_SP(input);
	else
		ssr &= ~ZMII_SSR_SP(input);

	out_be32(&dev->base->ssr, ssr);

	mutex_unlock(&dev->lock);
}

void zmii_detach(struct platform_device *ofdev, int input)
{
	struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);

	BUG_ON(!dev || dev->users == 0);

	mutex_lock(&dev->lock);

	ZMII_DBG(dev, "detach(%d)" NL, input);

	/* Disable this input */
	out_be32(&dev->base->fer,
		 in_be32(&dev->base->fer) & ~zmii_mode_mask(dev->mode, input));

	--dev->users;

	mutex_unlock(&dev->lock);
}

int zmii_get_regs_len(struct platform_device *ofdev)
{
	return sizeof(struct emac_ethtool_regs_subhdr) +
		sizeof(struct zmii_regs);
}

void *zmii_dump_regs(struct platform_device *ofdev, void *buf)
{
	struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);
	struct emac_ethtool_regs_subhdr *hdr = buf;
	struct zmii_regs *regs = (struct zmii_regs *)(hdr + 1);

	hdr->version = 0;
	hdr->index = 0; /* for now, are there chips with more than one
			 * zmii ? if yes, then we'll add a cell_index
			 * like we do for emac
			 */
	memcpy_fromio(regs, dev->base, sizeof(struct zmii_regs));
	return regs + 1;
}

static int __devinit zmii_probe(struct platform_device *ofdev)
{
	struct device_node *np = ofdev->dev.of_node;
	struct zmii_instance *dev;
	struct resource regs;
	int rc;

	rc = -ENOMEM;
	dev = kzalloc(sizeof(struct zmii_instance), GFP_KERNEL);
	if (dev == NULL)
		goto err_gone;

	mutex_init(&dev->lock);
	dev->ofdev = ofdev;
	dev->mode = PHY_MODE_NA;

	rc = -ENXIO;
	if (of_address_to_resource(np, 0, &regs)) {
		printk(KERN_ERR "%s: Can't get registers address\n",
		       np->full_name);
		goto err_free;
	}

	rc = -ENOMEM;
	dev->base = (struct zmii_regs __iomem *)ioremap(regs.start,
						sizeof(struct zmii_regs));
	if (dev->base == NULL) {
		printk(KERN_ERR "%s: Can't map device registers!\n",
		       np->full_name);
		goto err_free;
	}

	/* We may need FER value for autodetection later */
	dev->fer_save = in_be32(&dev->base->fer);

	/* Disable all inputs by default */
	out_be32(&dev->base->fer, 0);

	printk(KERN_INFO
	       "ZMII %s initialized\n", ofdev->dev.of_node->full_name);
	wmb();
	dev_set_drvdata(&ofdev->dev, dev);

	return 0;

 err_free:
	kfree(dev);
 err_gone:
	return rc;
}

static int __devexit zmii_remove(struct platform_device *ofdev)
{
	struct zmii_instance *dev = dev_get_drvdata(&ofdev->dev);

	dev_set_drvdata(&ofdev->dev, NULL);

	WARN_ON(dev->users != 0);

	iounmap(dev->base);
	kfree(dev);

	return 0;
}

static struct of_device_id zmii_match[] =
{
	{
		.compatible	= "ibm,zmii",
	},
	/* For backward compat with old DT */
	{
		.type		= "emac-zmii",
	},
	{},
};

static struct platform_driver zmii_driver = {
	.driver = {
		.name = "emac-zmii",
		.owner = THIS_MODULE,
		.of_match_table = zmii_match,
	},
	.probe = zmii_probe,
	.remove = zmii_remove,
};

int __init zmii_init(void)
{
	return platform_driver_register(&zmii_driver);
}

void zmii_exit(void)
{
	platform_driver_unregister(&zmii_driver);
}