summaryrefslogtreecommitdiffstats
path: root/drivers/net/fs_enet/fs_enet-mii.c
blob: 0cd07150bf4aeee6e3add86d7e6e5e23544c3288 (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
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
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
/*
 * 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>
 *
 * Heavily based on original FEC driver by Dan Malek <dan@embeddededge.com>
 * and modifications by Joakim Tjernlund <joakim.tjernlund@lumentis.se>
 *
 * 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/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/string.h>
#include <linux/ptrace.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/bitops.h>

#include <asm/pgtable.h>
#include <asm/irq.h>
#include <asm/uaccess.h>

#include "fs_enet.h"

/*************************************************/

/*
 * Generic PHY support.
 * Should work for all PHYs, but link change is detected by polling
 */

static void generic_timer_callback(unsigned long data)
{
	struct net_device *dev = (struct net_device *)data;
	struct fs_enet_private *fep = netdev_priv(dev);

	fep->phy_timer_list.expires = jiffies + HZ / 2;

	add_timer(&fep->phy_timer_list);

	fs_mii_link_status_change_check(dev, 0);
}

static void generic_startup(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);

	fep->phy_timer_list.expires = jiffies + HZ / 2;	/* every 500ms */
	fep->phy_timer_list.data = (unsigned long)dev;
	fep->phy_timer_list.function = generic_timer_callback;
	add_timer(&fep->phy_timer_list);
}

static void generic_shutdown(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);

	del_timer_sync(&fep->phy_timer_list);
}

/* ------------------------------------------------------------------------- */
/* The Davicom DM9161 is used on the NETTA board			     */

/* register definitions */

#define MII_DM9161_ANAR		4	/* Aux. Config Register         */
#define MII_DM9161_ACR		16	/* Aux. Config Register         */
#define MII_DM9161_ACSR		17	/* Aux. Config/Status Register  */
#define MII_DM9161_10TCSR	18	/* 10BaseT Config/Status Reg.   */
#define MII_DM9161_INTR		21	/* Interrupt Register           */
#define MII_DM9161_RECR		22	/* Receive Error Counter Reg.   */
#define MII_DM9161_DISCR	23	/* Disconnect Counter Register  */

static void dm9161_startup(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);

	fs_mii_write(dev, fep->mii_if.phy_id, MII_DM9161_INTR, 0x0000);
	/* Start autonegotiation */
	fs_mii_write(dev, fep->mii_if.phy_id, MII_BMCR, 0x1200);

	set_current_state(TASK_UNINTERRUPTIBLE);
	schedule_timeout(HZ*8);
}

static void dm9161_ack_int(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);

	fs_mii_read(dev, fep->mii_if.phy_id, MII_DM9161_INTR);
}

static void dm9161_shutdown(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);

	fs_mii_write(dev, fep->mii_if.phy_id, MII_DM9161_INTR, 0x0f00);
}

/**********************************************************************************/

static const struct phy_info phy_info[] = {
	{
		.id = 0x00181b88,
		.name = "DM9161",
		.startup = dm9161_startup,
		.ack_int = dm9161_ack_int,
		.shutdown = dm9161_shutdown,
	}, {
		.id = 0,
		.name = "GENERIC",
		.startup = generic_startup,
		.shutdown = generic_shutdown,
	},
};

/**********************************************************************************/

static int phy_id_detect(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	const struct fs_platform_info *fpi = fep->fpi;
	struct fs_enet_mii_bus *bus = fep->mii_bus;
	int i, r, start, end, phytype, physubtype;
	const struct phy_info *phy;
	int phy_hwid, phy_id;

	phy_hwid = -1;
	fep->phy = NULL;

	/* auto-detect? */
	if (fpi->phy_addr == -1) {
		start = 1;
		end = 32;
	} else {		/* direct */
		start = fpi->phy_addr;
		end = start + 1;
	}

	for (phy_id = start; phy_id < end; phy_id++) {
		/* skip already used phy addresses on this bus */ 
		if (bus->usage_map & (1 << phy_id))
			continue;
		r = fs_mii_read(dev, phy_id, MII_PHYSID1);
		if (r == -1 || (phytype = (r & 0xffff)) == 0xffff)
			continue;
		r = fs_mii_read(dev, phy_id, MII_PHYSID2);
		if (r == -1 || (physubtype = (r & 0xffff)) == 0xffff)
			continue;
		phy_hwid = (phytype << 16) | physubtype;
		if (phy_hwid != -1)
			break;
	}

	if (phy_hwid == -1) {
		printk(KERN_ERR DRV_MODULE_NAME
		       ": %s No PHY detected! range=0x%02x-0x%02x\n",
			dev->name, start, end);
		return -1;
	}

	for (i = 0, phy = phy_info; i < ARRAY_SIZE(phy_info); i++, phy++)
		if (phy->id == (phy_hwid >> 4) || phy->id == 0)
			break;

	if (i >= ARRAY_SIZE(phy_info)) {
		printk(KERN_ERR DRV_MODULE_NAME
		       ": %s PHY id 0x%08x is not supported!\n",
		       dev->name, phy_hwid);
		return -1;
	}

	fep->phy = phy;

	/* mark this address as used */
	bus->usage_map |= (1 << phy_id);

	printk(KERN_INFO DRV_MODULE_NAME
	       ": %s Phy @ 0x%x, type %s (0x%08x)%s\n",
	       dev->name, phy_id, fep->phy->name, phy_hwid,
	       fpi->phy_addr == -1 ? " (auto-detected)" : "");

	return phy_id;
}

void fs_mii_startup(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);

	if (fep->phy->startup)
		(*fep->phy->startup) (dev);
}

void fs_mii_shutdown(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);

	if (fep->phy->shutdown)
		(*fep->phy->shutdown) (dev);
}

void fs_mii_ack_int(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);

	if (fep->phy->ack_int)
		(*fep->phy->ack_int) (dev);
}

#define MII_LINK	0x0001
#define MII_HALF	0x0002
#define MII_FULL	0x0004
#define MII_BASE4	0x0008
#define MII_10M		0x0010
#define MII_100M	0x0020
#define MII_1G		0x0040
#define MII_10G		0x0080

/* return full mii info at one gulp, with a usable form */
static unsigned int mii_full_status(struct mii_if_info *mii)
{
	unsigned int status;
	int bmsr, adv, lpa, neg;
	struct fs_enet_private* fep = netdev_priv(mii->dev);
	
	/* first, a dummy read, needed to latch some MII phys */
	(void)mii->mdio_read(mii->dev, mii->phy_id, MII_BMSR);
	bmsr = mii->mdio_read(mii->dev, mii->phy_id, MII_BMSR);

	/* no link */
	if ((bmsr & BMSR_LSTATUS) == 0)
		return 0;

	status = MII_LINK;
	
	/* Lets look what ANEG says if it's supported - otherwize we shall
	   take the right values from the platform info*/
	if(!mii->force_media) {
		/* autoneg not completed; don't bother */
		if ((bmsr & BMSR_ANEGCOMPLETE) == 0)
			return 0;

		adv = (*mii->mdio_read)(mii->dev, mii->phy_id, MII_ADVERTISE);
		lpa = (*mii->mdio_read)(mii->dev, mii->phy_id, MII_LPA);

		neg = lpa & adv;
	} else {
		neg = fep->fpi->bus_info->lpa;
	}

	if (neg & LPA_100FULL)
		status |= MII_FULL | MII_100M;
	else if (neg & LPA_100BASE4)
		status |= MII_FULL | MII_BASE4 | MII_100M;
	else if (neg & LPA_100HALF)
		status |= MII_HALF | MII_100M;
	else if (neg & LPA_10FULL)
		status |= MII_FULL | MII_10M;
	else
		status |= MII_HALF | MII_10M;
	
	return status;
}

void fs_mii_link_status_change_check(struct net_device *dev, int init_media)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	struct mii_if_info *mii = &fep->mii_if;
	unsigned int mii_status;
	int ok_to_print, link, duplex, speed;
	unsigned long flags;

	ok_to_print = netif_msg_link(fep);

	mii_status = mii_full_status(mii);

	if (!init_media && mii_status == fep->last_mii_status)
		return;

	fep->last_mii_status = mii_status;

	link = !!(mii_status & MII_LINK);
	duplex = !!(mii_status & MII_FULL);
	speed = (mii_status & MII_100M) ? 100 : 10;

	if (link == 0) {
		netif_carrier_off(mii->dev);
		netif_stop_queue(dev);
		if (!init_media) {
			spin_lock_irqsave(&fep->lock, flags);
			(*fep->ops->stop)(dev);
			spin_unlock_irqrestore(&fep->lock, flags);
		}

		if (ok_to_print)
			printk(KERN_INFO "%s: link down\n", mii->dev->name);

	} else {

		mii->full_duplex = duplex;

		netif_carrier_on(mii->dev);

		spin_lock_irqsave(&fep->lock, flags);
		fep->duplex = duplex;
		fep->speed = speed;
		(*fep->ops->restart)(dev);
		spin_unlock_irqrestore(&fep->lock, flags);

		netif_start_queue(dev);

		if (ok_to_print)
			printk(KERN_INFO "%s: link up, %dMbps, %s-duplex\n",
			       dev->name, speed, duplex ? "full" : "half");
	}
}

/**********************************************************************************/

int fs_mii_read(struct net_device *dev, int phy_id, int location)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	struct fs_enet_mii_bus *bus = fep->mii_bus;

	unsigned long flags;
	int ret;

	spin_lock_irqsave(&bus->mii_lock, flags);
	ret = (*bus->mii_read)(bus, phy_id, location);
	spin_unlock_irqrestore(&bus->mii_lock, flags);

	return ret;
}

void fs_mii_write(struct net_device *dev, int phy_id, int location, int value)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	struct fs_enet_mii_bus *bus = fep->mii_bus;
	unsigned long flags;

	spin_lock_irqsave(&bus->mii_lock, flags);
	(*bus->mii_write)(bus, phy_id, location, value);
	spin_unlock_irqrestore(&bus->mii_lock, flags);
}

/*****************************************************************************/

/* list of all registered mii buses */
static LIST_HEAD(fs_mii_bus_list);

static struct fs_enet_mii_bus *lookup_bus(int method, int id)
{
	struct list_head *ptr;
	struct fs_enet_mii_bus *bus;

	list_for_each(ptr, &fs_mii_bus_list) {
		bus = list_entry(ptr, struct fs_enet_mii_bus, list);
		if (bus->bus_info->method == method &&
			bus->bus_info->id == id)
			return bus;
	}
	return NULL;
}

static struct fs_enet_mii_bus *create_bus(const struct fs_mii_bus_info *bi)
{
	struct fs_enet_mii_bus *bus;
	int ret = 0;

	bus = kmalloc(sizeof(*bus), GFP_KERNEL);
	if (bus == NULL) {
		ret = -ENOMEM;
		goto err;
	}
	memset(bus, 0, sizeof(*bus));
	spin_lock_init(&bus->mii_lock);
	bus->bus_info = bi;
	bus->refs = 0;
	bus->usage_map = 0;

	/* perform initialization */
	switch (bi->method) {

		case fsmii_fixed:
			ret = fs_mii_fixed_init(bus);
			if (ret != 0)
				goto err;
			break;

		case fsmii_bitbang:
			ret = fs_mii_bitbang_init(bus);
			if (ret != 0)
				goto err;
			break;
#ifdef CONFIG_FS_ENET_HAS_FEC
		case fsmii_fec:
			ret = fs_mii_fec_init(bus);
			if (ret != 0)
				goto err;
			break;
#endif
		default:
			ret = -EINVAL;
			goto err;
	}

	list_add(&bus->list, &fs_mii_bus_list);

	return bus;

err:
	kfree(bus);
	return ERR_PTR(ret);
}

static void destroy_bus(struct fs_enet_mii_bus *bus)
{
	/* remove from bus list */
	list_del(&bus->list);

	/* nothing more needed */
	kfree(bus);
}

int fs_mii_connect(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	const struct fs_platform_info *fpi = fep->fpi;
	struct fs_enet_mii_bus *bus = NULL;

	/* check method validity */
	switch (fpi->bus_info->method) {
		case fsmii_fixed:
		case fsmii_bitbang:
			break;
#ifdef CONFIG_FS_ENET_HAS_FEC
		case fsmii_fec:
			break;
#endif
		default:
			printk(KERN_ERR DRV_MODULE_NAME
			       ": %s Unknown MII bus method (%d)!\n",
			       dev->name, fpi->bus_info->method);
			return -EINVAL; 
	}

	bus = lookup_bus(fpi->bus_info->method, fpi->bus_info->id);

	/* if not found create new bus */
	if (bus == NULL) {
		bus = create_bus(fpi->bus_info);
		if (IS_ERR(bus)) {
			printk(KERN_ERR DRV_MODULE_NAME
			       ": %s MII bus creation failure!\n", dev->name);
			return PTR_ERR(bus);
		}
	}

	bus->refs++;

	fep->mii_bus = bus;

	fep->mii_if.dev = dev;
	fep->mii_if.phy_id_mask = 0x1f;
	fep->mii_if.reg_num_mask = 0x1f;
	fep->mii_if.mdio_read = fs_mii_read;
	fep->mii_if.mdio_write = fs_mii_write;
	fep->mii_if.force_media = fpi->bus_info->disable_aneg;
	fep->mii_if.phy_id = phy_id_detect(dev);

	return 0;
}

void fs_mii_disconnect(struct net_device *dev)
{
	struct fs_enet_private *fep = netdev_priv(dev);
	struct fs_enet_mii_bus *bus = NULL;

	bus = fep->mii_bus;
	fep->mii_bus = NULL;

	if (--bus->refs <= 0)
		destroy_bus(bus);
}
OpenPOWER on IntegriCloud