summaryrefslogtreecommitdiffstats
path: root/drivers/net/ibm_newemac/rgmii.c
blob: 4fa53f3def64390703f74d1579e46230a785305a (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
330
331
332
333
334
335
336
337
338
/*
 * drivers/net/ibm_newemac/rgmii.c
 *
 * Driver for PowerPC 4xx on-chip ethernet controller, RGMII 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
 * 	Matt Porter <mporter@kernel.crashing.org>
 * 	Copyright 2004 MontaVista Software, 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 "debug.h"

// XXX FIXME: Axon seems to support a subset of the RGMII, we
// thus need to take that into account and possibly change some
// of the bit settings below that don't seem to quite match the
// AXON spec

/* RGMIIx_FER */
#define RGMII_FER_MASK(idx)	(0x7 << ((idx) * 4))
#define RGMII_FER_RTBI(idx)	(0x4 << ((idx) * 4))
#define RGMII_FER_RGMII(idx)	(0x5 << ((idx) * 4))
#define RGMII_FER_TBI(idx)	(0x6 << ((idx) * 4))
#define RGMII_FER_GMII(idx)	(0x7 << ((idx) * 4))
#define RGMII_FER_MII(idx)	RGMII_FER_GMII(idx)

/* RGMIIx_SSR */
#define RGMII_SSR_MASK(idx)	(0x7 << ((idx) * 8))
#define RGMII_SSR_100(idx)	(0x2 << ((idx) * 8))
#define RGMII_SSR_1000(idx)	(0x4 << ((idx) * 8))

/* RGMII bridge supports only GMII/TBI and RGMII/RTBI PHYs */
static inline int rgmii_valid_mode(int phy_mode)
{
	return  phy_mode == PHY_MODE_GMII ||
		phy_mode == PHY_MODE_MII ||
		phy_mode == PHY_MODE_RGMII ||
		phy_mode == PHY_MODE_TBI ||
		phy_mode == PHY_MODE_RTBI;
}

static inline const char *rgmii_mode_name(int mode)
{
	switch (mode) {
	case PHY_MODE_RGMII:
		return "RGMII";
	case PHY_MODE_TBI:
		return "TBI";
	case PHY_MODE_GMII:
		return "GMII";
	case PHY_MODE_MII:
		return "MII";
	case PHY_MODE_RTBI:
		return "RTBI";
	default:
		BUG();
	}
}

static inline u32 rgmii_mode_mask(int mode, int input)
{
	switch (mode) {
	case PHY_MODE_RGMII:
		return RGMII_FER_RGMII(input);
	case PHY_MODE_TBI:
		return RGMII_FER_TBI(input);
	case PHY_MODE_GMII:
		return RGMII_FER_GMII(input);
	case PHY_MODE_MII:
		return RGMII_FER_MII(input);
	case PHY_MODE_RTBI:
		return RGMII_FER_RTBI(input);
	default:
		BUG();
	}
}

int __devinit rgmii_attach(struct platform_device *ofdev, int input, int mode)
{
	struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
	struct rgmii_regs __iomem *p = dev->base;

	RGMII_DBG(dev, "attach(%d)" NL, input);

	/* Check if we need to attach to a RGMII */
	if (input < 0 || !rgmii_valid_mode(mode)) {
		printk(KERN_ERR "%s: unsupported settings !\n",
		       ofdev->dev.of_node->full_name);
		return -ENODEV;
	}

	mutex_lock(&dev->lock);

	/* Enable this input */
	out_be32(&p->fer, in_be32(&p->fer) | rgmii_mode_mask(mode, input));

	printk(KERN_NOTICE "%s: input %d in %s mode\n",
	       ofdev->dev.of_node->full_name, input, rgmii_mode_name(mode));

	++dev->users;

	mutex_unlock(&dev->lock);

	return 0;
}

void rgmii_set_speed(struct platform_device *ofdev, int input, int speed)
{
	struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
	struct rgmii_regs __iomem *p = dev->base;
	u32 ssr;

	mutex_lock(&dev->lock);

	ssr = in_be32(&p->ssr) & ~RGMII_SSR_MASK(input);

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

	if (speed == SPEED_1000)
		ssr |= RGMII_SSR_1000(input);
	else if (speed == SPEED_100)
		ssr |= RGMII_SSR_100(input);

	out_be32(&p->ssr, ssr);

	mutex_unlock(&dev->lock);
}

void rgmii_get_mdio(struct platform_device *ofdev, int input)
{
	struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
	struct rgmii_regs __iomem *p = dev->base;
	u32 fer;

	RGMII_DBG2(dev, "get_mdio(%d)" NL, input);

	if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
		return;

	mutex_lock(&dev->lock);

	fer = in_be32(&p->fer);
	fer |= 0x00080000u >> input;
	out_be32(&p->fer, fer);
	(void)in_be32(&p->fer);

	DBG2(dev, " fer = 0x%08x\n", fer);
}

void rgmii_put_mdio(struct platform_device *ofdev, int input)
{
	struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
	struct rgmii_regs __iomem *p = dev->base;
	u32 fer;

	RGMII_DBG2(dev, "put_mdio(%d)" NL, input);

	if (!(dev->flags & EMAC_RGMII_FLAG_HAS_MDIO))
		return;

	fer = in_be32(&p->fer);
	fer &= ~(0x00080000u >> input);
	out_be32(&p->fer, fer);
	(void)in_be32(&p->fer);

	DBG2(dev, " fer = 0x%08x\n", fer);

	mutex_unlock(&dev->lock);
}

void rgmii_detach(struct platform_device *ofdev, int input)
{
	struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
	struct rgmii_regs __iomem *p;

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

	mutex_lock(&dev->lock);

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

	/* Disable this input */
	out_be32(&p->fer, in_be32(&p->fer) & ~RGMII_FER_MASK(input));

	--dev->users;

	mutex_unlock(&dev->lock);
}

int rgmii_get_regs_len(struct platform_device *ofdev)
{
	return sizeof(struct emac_ethtool_regs_subhdr) +
		sizeof(struct rgmii_regs);
}

void *rgmii_dump_regs(struct platform_device *ofdev, void *buf)
{
	struct rgmii_instance *dev = dev_get_drvdata(&ofdev->dev);
	struct emac_ethtool_regs_subhdr *hdr = buf;
	struct rgmii_regs *regs = (struct rgmii_regs *)(hdr + 1);

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


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

	rc = -ENOMEM;
	dev = kzalloc(sizeof(struct rgmii_instance), GFP_KERNEL);
	if (dev == NULL) {
		printk(KERN_ERR "%s: could not allocate RGMII device!\n",
		       np->full_name);
		goto err_gone;
	}

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

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

	/* Check for RGMII flags */
	if (of_get_property(ofdev->dev.of_node, "has-mdio", NULL))
		dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;

	/* CAB lacks the right properties, fix this up */
	if (of_device_is_compatible(ofdev->dev.of_node, "ibm,rgmii-axon"))
		dev->flags |= EMAC_RGMII_FLAG_HAS_MDIO;

	DBG2(dev, " Boot FER = 0x%08x, SSR = 0x%08x\n",
	     in_be32(&dev->base->fer), in_be32(&dev->base->ssr));

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

	printk(KERN_INFO
	       "RGMII %s initialized with%s MDIO support\n",
	       ofdev->dev.of_node->full_name,
	       (dev->flags & EMAC_RGMII_FLAG_HAS_MDIO) ? "" : "out");

	wmb();
	dev_set_drvdata(&ofdev->dev, dev);

	return 0;

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

static int __devexit rgmii_remove(struct platform_device *ofdev)
{
	struct rgmii_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 rgmii_match[] =
{
	{
		.compatible	= "ibm,rgmii",
	},
	{
		.type		= "emac-rgmii",
	},
	{},
};

static struct platform_driver rgmii_driver = {
	.driver = {
		.name = "emac-rgmii",
		.owner = THIS_MODULE,
		.of_match_table = rgmii_match,
	},
	.probe = rgmii_probe,
	.remove = rgmii_remove,
};

int __init rgmii_init(void)
{
	return platform_driver_register(&rgmii_driver);
}

void rgmii_exit(void)
{
	platform_driver_unregister(&rgmii_driver);
}