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  • Committer: Bazaar Package Importer
  • Author(s): Amit Kucheria, Amit Kucheria
  • Date: 2010-03-10 02:28:15 UTC
  • Revision ID: james.westby@ubuntu.com-20100310022815-7sd3gwvn5kenaq33
Tags: 2.6.33-500.1
[ Amit Kucheria ]

* Initial release of a 2.6.33-based OMAP kernel
* UBUNTU: [Upstream] Fix omap 1-wire driver compilation
* UBUNTU: ubuntu: AppArmor -- update to mainline 2010-03-04

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drivers/net/phy/phy.c
 
1
/*
 
2
 * drivers/net/phy/phy.c
 
3
 *
 
4
 * Framework for configuring and reading PHY devices
 
5
 * Based on code in sungem_phy.c and gianfar_phy.c
 
6
 *
 
7
 * Author: Andy Fleming
 
8
 *
 
9
 * Copyright (c) 2004 Freescale Semiconductor, Inc.
 
10
 * Copyright (c) 2006, 2007  Maciej W. Rozycki
 
11
 *
 
12
 * This program is free software; you can redistribute  it and/or modify it
 
13
 * under  the terms of  the GNU General  Public License as published by the
 
14
 * Free Software Foundation;  either version 2 of the  License, or (at your
 
15
 * option) any later version.
 
16
 *
 
17
 */
 
18
#include <linux/kernel.h>
 
19
#include <linux/string.h>
 
20
#include <linux/errno.h>
 
21
#include <linux/unistd.h>
 
22
#include <linux/slab.h>
 
23
#include <linux/interrupt.h>
 
24
#include <linux/init.h>
 
25
#include <linux/delay.h>
 
26
#include <linux/netdevice.h>
 
27
#include <linux/etherdevice.h>
 
28
#include <linux/skbuff.h>
 
29
#include <linux/mm.h>
 
30
#include <linux/module.h>
 
31
#include <linux/mii.h>
 
32
#include <linux/ethtool.h>
 
33
#include <linux/phy.h>
 
34
#include <linux/timer.h>
 
35
#include <linux/workqueue.h>
 
36
 
 
37
#include <asm/atomic.h>
 
38
#include <asm/io.h>
 
39
#include <asm/irq.h>
 
40
#include <asm/uaccess.h>
 
41
 
 
42
/**
 
43
 * phy_print_status - Convenience function to print out the current phy status
 
44
 * @phydev: the phy_device struct
 
45
 */
 
46
void phy_print_status(struct phy_device *phydev)
 
47
{
 
48
        pr_info("PHY: %s - Link is %s", dev_name(&phydev->dev),
 
49
                        phydev->link ? "Up" : "Down");
 
50
        if (phydev->link)
 
51
                printk(" - %d/%s", phydev->speed,
 
52
                                DUPLEX_FULL == phydev->duplex ?
 
53
                                "Full" : "Half");
 
54
 
 
55
        printk("\n");
 
56
}
 
57
EXPORT_SYMBOL(phy_print_status);
 
58
 
 
59
 
 
60
/**
 
61
 * phy_clear_interrupt - Ack the phy device's interrupt
 
62
 * @phydev: the phy_device struct
 
63
 *
 
64
 * If the @phydev driver has an ack_interrupt function, call it to
 
65
 * ack and clear the phy device's interrupt.
 
66
 *
 
67
 * Returns 0 on success on < 0 on error.
 
68
 */
 
69
int phy_clear_interrupt(struct phy_device *phydev)
 
70
{
 
71
        int err = 0;
 
72
 
 
73
        if (phydev->drv->ack_interrupt)
 
74
                err = phydev->drv->ack_interrupt(phydev);
 
75
 
 
76
        return err;
 
77
}
 
78
 
 
79
/**
 
80
 * phy_config_interrupt - configure the PHY device for the requested interrupts
 
81
 * @phydev: the phy_device struct
 
82
 * @interrupts: interrupt flags to configure for this @phydev
 
83
 *
 
84
 * Returns 0 on success on < 0 on error.
 
85
 */
 
86
int phy_config_interrupt(struct phy_device *phydev, u32 interrupts)
 
87
{
 
88
        int err = 0;
 
89
 
 
90
        phydev->interrupts = interrupts;
 
91
        if (phydev->drv->config_intr)
 
92
                err = phydev->drv->config_intr(phydev);
 
93
 
 
94
        return err;
 
95
}
 
96
 
 
97
 
 
98
/**
 
99
 * phy_aneg_done - return auto-negotiation status
 
100
 * @phydev: target phy_device struct
 
101
 *
 
102
 * Description: Reads the status register and returns 0 either if
 
103
 *   auto-negotiation is incomplete, or if there was an error.
 
104
 *   Returns BMSR_ANEGCOMPLETE if auto-negotiation is done.
 
105
 */
 
106
static inline int phy_aneg_done(struct phy_device *phydev)
 
107
{
 
108
        int retval;
 
109
 
 
110
        retval = phy_read(phydev, MII_BMSR);
 
111
 
 
112
        return (retval < 0) ? retval : (retval & BMSR_ANEGCOMPLETE);
 
113
}
 
114
 
 
115
/* A structure for mapping a particular speed and duplex
 
116
 * combination to a particular SUPPORTED and ADVERTISED value */
 
117
struct phy_setting {
 
118
        int speed;
 
119
        int duplex;
 
120
        u32 setting;
 
121
};
 
122
 
 
123
/* A mapping of all SUPPORTED settings to speed/duplex */
 
124
static const struct phy_setting settings[] = {
 
125
        {
 
126
                .speed = 10000,
 
127
                .duplex = DUPLEX_FULL,
 
128
                .setting = SUPPORTED_10000baseT_Full,
 
129
        },
 
130
        {
 
131
                .speed = SPEED_1000,
 
132
                .duplex = DUPLEX_FULL,
 
133
                .setting = SUPPORTED_1000baseT_Full,
 
134
        },
 
135
        {
 
136
                .speed = SPEED_1000,
 
137
                .duplex = DUPLEX_HALF,
 
138
                .setting = SUPPORTED_1000baseT_Half,
 
139
        },
 
140
        {
 
141
                .speed = SPEED_100,
 
142
                .duplex = DUPLEX_FULL,
 
143
                .setting = SUPPORTED_100baseT_Full,
 
144
        },
 
145
        {
 
146
                .speed = SPEED_100,
 
147
                .duplex = DUPLEX_HALF,
 
148
                .setting = SUPPORTED_100baseT_Half,
 
149
        },
 
150
        {
 
151
                .speed = SPEED_10,
 
152
                .duplex = DUPLEX_FULL,
 
153
                .setting = SUPPORTED_10baseT_Full,
 
154
        },
 
155
        {
 
156
                .speed = SPEED_10,
 
157
                .duplex = DUPLEX_HALF,
 
158
                .setting = SUPPORTED_10baseT_Half,
 
159
        },
 
160
};
 
161
 
 
162
#define MAX_NUM_SETTINGS ARRAY_SIZE(settings)
 
163
 
 
164
/**
 
165
 * phy_find_setting - find a PHY settings array entry that matches speed & duplex
 
166
 * @speed: speed to match
 
167
 * @duplex: duplex to match
 
168
 *
 
169
 * Description: Searches the settings array for the setting which
 
170
 *   matches the desired speed and duplex, and returns the index
 
171
 *   of that setting.  Returns the index of the last setting if
 
172
 *   none of the others match.
 
173
 */
 
174
static inline int phy_find_setting(int speed, int duplex)
 
175
{
 
176
        int idx = 0;
 
177
 
 
178
        while (idx < ARRAY_SIZE(settings) &&
 
179
                        (settings[idx].speed != speed ||
 
180
                        settings[idx].duplex != duplex))
 
181
                idx++;
 
182
 
 
183
        return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 
184
}
 
185
 
 
186
/**
 
187
 * phy_find_valid - find a PHY setting that matches the requested features mask
 
188
 * @idx: The first index in settings[] to search
 
189
 * @features: A mask of the valid settings
 
190
 *
 
191
 * Description: Returns the index of the first valid setting less
 
192
 *   than or equal to the one pointed to by idx, as determined by
 
193
 *   the mask in features.  Returns the index of the last setting
 
194
 *   if nothing else matches.
 
195
 */
 
196
static inline int phy_find_valid(int idx, u32 features)
 
197
{
 
198
        while (idx < MAX_NUM_SETTINGS && !(settings[idx].setting & features))
 
199
                idx++;
 
200
 
 
201
        return idx < MAX_NUM_SETTINGS ? idx : MAX_NUM_SETTINGS - 1;
 
202
}
 
203
 
 
204
/**
 
205
 * phy_sanitize_settings - make sure the PHY is set to supported speed and duplex
 
206
 * @phydev: the target phy_device struct
 
207
 *
 
208
 * Description: Make sure the PHY is set to supported speeds and
 
209
 *   duplexes.  Drop down by one in this order:  1000/FULL,
 
210
 *   1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
 
211
 */
 
212
void phy_sanitize_settings(struct phy_device *phydev)
 
213
{
 
214
        u32 features = phydev->supported;
 
215
        int idx;
 
216
 
 
217
        /* Sanitize settings based on PHY capabilities */
 
218
        if ((features & SUPPORTED_Autoneg) == 0)
 
219
                phydev->autoneg = AUTONEG_DISABLE;
 
220
 
 
221
        idx = phy_find_valid(phy_find_setting(phydev->speed, phydev->duplex),
 
222
                        features);
 
223
 
 
224
        phydev->speed = settings[idx].speed;
 
225
        phydev->duplex = settings[idx].duplex;
 
226
}
 
227
EXPORT_SYMBOL(phy_sanitize_settings);
 
228
 
 
229
/**
 
230
 * phy_ethtool_sset - generic ethtool sset function, handles all the details
 
231
 * @phydev: target phy_device struct
 
232
 * @cmd: ethtool_cmd
 
233
 *
 
234
 * A few notes about parameter checking:
 
235
 * - We don't set port or transceiver, so we don't care what they
 
236
 *   were set to.
 
237
 * - phy_start_aneg() will make sure forced settings are sane, and
 
238
 *   choose the next best ones from the ones selected, so we don't
 
239
 *   care if ethtool tries to give us bad values.
 
240
 */
 
241
int phy_ethtool_sset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 
242
{
 
243
        if (cmd->phy_address != phydev->addr)
 
244
                return -EINVAL;
 
245
 
 
246
        /* We make sure that we don't pass unsupported
 
247
         * values in to the PHY */
 
248
        cmd->advertising &= phydev->supported;
 
249
 
 
250
        /* Verify the settings we care about. */
 
251
        if (cmd->autoneg != AUTONEG_ENABLE && cmd->autoneg != AUTONEG_DISABLE)
 
252
                return -EINVAL;
 
253
 
 
254
        if (cmd->autoneg == AUTONEG_ENABLE && cmd->advertising == 0)
 
255
                return -EINVAL;
 
256
 
 
257
        if (cmd->autoneg == AUTONEG_DISABLE &&
 
258
            ((cmd->speed != SPEED_1000 &&
 
259
              cmd->speed != SPEED_100 &&
 
260
              cmd->speed != SPEED_10) ||
 
261
             (cmd->duplex != DUPLEX_HALF &&
 
262
              cmd->duplex != DUPLEX_FULL)))
 
263
                return -EINVAL;
 
264
 
 
265
        phydev->autoneg = cmd->autoneg;
 
266
 
 
267
        phydev->speed = cmd->speed;
 
268
 
 
269
        phydev->advertising = cmd->advertising;
 
270
 
 
271
        if (AUTONEG_ENABLE == cmd->autoneg)
 
272
                phydev->advertising |= ADVERTISED_Autoneg;
 
273
        else
 
274
                phydev->advertising &= ~ADVERTISED_Autoneg;
 
275
 
 
276
        phydev->duplex = cmd->duplex;
 
277
 
 
278
        /* Restart the PHY */
 
279
        phy_start_aneg(phydev);
 
280
 
 
281
        return 0;
 
282
}
 
283
EXPORT_SYMBOL(phy_ethtool_sset);
 
284
 
 
285
int phy_ethtool_gset(struct phy_device *phydev, struct ethtool_cmd *cmd)
 
286
{
 
287
        cmd->supported = phydev->supported;
 
288
 
 
289
        cmd->advertising = phydev->advertising;
 
290
 
 
291
        cmd->speed = phydev->speed;
 
292
        cmd->duplex = phydev->duplex;
 
293
        cmd->port = PORT_MII;
 
294
        cmd->phy_address = phydev->addr;
 
295
        cmd->transceiver = XCVR_EXTERNAL;
 
296
        cmd->autoneg = phydev->autoneg;
 
297
 
 
298
        return 0;
 
299
}
 
300
EXPORT_SYMBOL(phy_ethtool_gset);
 
301
 
 
302
/**
 
303
 * phy_mii_ioctl - generic PHY MII ioctl interface
 
304
 * @phydev: the phy_device struct
 
305
 * @mii_data: MII ioctl data
 
306
 * @cmd: ioctl cmd to execute
 
307
 *
 
308
 * Note that this function is currently incompatible with the
 
309
 * PHYCONTROL layer.  It changes registers without regard to
 
310
 * current state.  Use at own risk.
 
311
 */
 
312
int phy_mii_ioctl(struct phy_device *phydev,
 
313
                struct mii_ioctl_data *mii_data, int cmd)
 
314
{
 
315
        u16 val = mii_data->val_in;
 
316
 
 
317
        switch (cmd) {
 
318
        case SIOCGMIIPHY:
 
319
                mii_data->phy_id = phydev->addr;
 
320
                /* fall through */
 
321
 
 
322
        case SIOCGMIIREG:
 
323
                mii_data->val_out = phy_read(phydev, mii_data->reg_num);
 
324
                break;
 
325
 
 
326
        case SIOCSMIIREG:
 
327
                if (mii_data->phy_id == phydev->addr) {
 
328
                        switch(mii_data->reg_num) {
 
329
                        case MII_BMCR:
 
330
                                if ((val & (BMCR_RESET|BMCR_ANENABLE)) == 0)
 
331
                                        phydev->autoneg = AUTONEG_DISABLE;
 
332
                                else
 
333
                                        phydev->autoneg = AUTONEG_ENABLE;
 
334
                                if ((!phydev->autoneg) && (val & BMCR_FULLDPLX))
 
335
                                        phydev->duplex = DUPLEX_FULL;
 
336
                                else
 
337
                                        phydev->duplex = DUPLEX_HALF;
 
338
                                if ((!phydev->autoneg) &&
 
339
                                                (val & BMCR_SPEED1000))
 
340
                                        phydev->speed = SPEED_1000;
 
341
                                else if ((!phydev->autoneg) &&
 
342
                                                (val & BMCR_SPEED100))
 
343
                                        phydev->speed = SPEED_100;
 
344
                                break;
 
345
                        case MII_ADVERTISE:
 
346
                                phydev->advertising = val;
 
347
                                break;
 
348
                        default:
 
349
                                /* do nothing */
 
350
                                break;
 
351
                        }
 
352
                }
 
353
 
 
354
                phy_write(phydev, mii_data->reg_num, val);
 
355
                
 
356
                if (mii_data->reg_num == MII_BMCR &&
 
357
                    val & BMCR_RESET &&
 
358
                    phydev->drv->config_init) {
 
359
                        phy_scan_fixups(phydev);
 
360
                        phydev->drv->config_init(phydev);
 
361
                }
 
362
                break;
 
363
 
 
364
        default:
 
365
                return -EOPNOTSUPP;
 
366
        }
 
367
 
 
368
        return 0;
 
369
}
 
370
EXPORT_SYMBOL(phy_mii_ioctl);
 
371
 
 
372
/**
 
373
 * phy_start_aneg - start auto-negotiation for this PHY device
 
374
 * @phydev: the phy_device struct
 
375
 *
 
376
 * Description: Sanitizes the settings (if we're not autonegotiating
 
377
 *   them), and then calls the driver's config_aneg function.
 
378
 *   If the PHYCONTROL Layer is operating, we change the state to
 
379
 *   reflect the beginning of Auto-negotiation or forcing.
 
380
 */
 
381
int phy_start_aneg(struct phy_device *phydev)
 
382
{
 
383
        int err;
 
384
 
 
385
        mutex_lock(&phydev->lock);
 
386
 
 
387
        if (AUTONEG_DISABLE == phydev->autoneg)
 
388
                phy_sanitize_settings(phydev);
 
389
 
 
390
        err = phydev->drv->config_aneg(phydev);
 
391
 
 
392
        if (err < 0)
 
393
                goto out_unlock;
 
394
 
 
395
        if (phydev->state != PHY_HALTED) {
 
396
                if (AUTONEG_ENABLE == phydev->autoneg) {
 
397
                        phydev->state = PHY_AN;
 
398
                        phydev->link_timeout = PHY_AN_TIMEOUT;
 
399
                } else {
 
400
                        phydev->state = PHY_FORCING;
 
401
                        phydev->link_timeout = PHY_FORCE_TIMEOUT;
 
402
                }
 
403
        }
 
404
 
 
405
out_unlock:
 
406
        mutex_unlock(&phydev->lock);
 
407
        return err;
 
408
}
 
409
EXPORT_SYMBOL(phy_start_aneg);
 
410
 
 
411
 
 
412
static void phy_change(struct work_struct *work);
 
413
 
 
414
/**
 
415
 * phy_start_machine - start PHY state machine tracking
 
416
 * @phydev: the phy_device struct
 
417
 * @handler: callback function for state change notifications
 
418
 *
 
419
 * Description: The PHY infrastructure can run a state machine
 
420
 *   which tracks whether the PHY is starting up, negotiating,
 
421
 *   etc.  This function starts the timer which tracks the state
 
422
 *   of the PHY.  If you want to be notified when the state changes,
 
423
 *   pass in the callback @handler, otherwise, pass NULL.  If you
 
424
 *   want to maintain your own state machine, do not call this
 
425
 *   function.
 
426
 */
 
427
void phy_start_machine(struct phy_device *phydev,
 
428
                void (*handler)(struct net_device *))
 
429
{
 
430
        phydev->adjust_state = handler;
 
431
 
 
432
        schedule_delayed_work(&phydev->state_queue, HZ);
 
433
}
 
434
 
 
435
/**
 
436
 * phy_stop_machine - stop the PHY state machine tracking
 
437
 * @phydev: target phy_device struct
 
438
 *
 
439
 * Description: Stops the state machine timer, sets the state to UP
 
440
 *   (unless it wasn't up yet). This function must be called BEFORE
 
441
 *   phy_detach.
 
442
 */
 
443
void phy_stop_machine(struct phy_device *phydev)
 
444
{
 
445
        cancel_delayed_work_sync(&phydev->state_queue);
 
446
 
 
447
        mutex_lock(&phydev->lock);
 
448
        if (phydev->state > PHY_UP)
 
449
                phydev->state = PHY_UP;
 
450
        mutex_unlock(&phydev->lock);
 
451
 
 
452
        phydev->adjust_state = NULL;
 
453
}
 
454
 
 
455
/**
 
456
 * phy_force_reduction - reduce PHY speed/duplex settings by one step
 
457
 * @phydev: target phy_device struct
 
458
 *
 
459
 * Description: Reduces the speed/duplex settings by one notch,
 
460
 *   in this order--
 
461
 *   1000/FULL, 1000/HALF, 100/FULL, 100/HALF, 10/FULL, 10/HALF.
 
462
 *   The function bottoms out at 10/HALF.
 
463
 */
 
464
static void phy_force_reduction(struct phy_device *phydev)
 
465
{
 
466
        int idx;
 
467
 
 
468
        idx = phy_find_setting(phydev->speed, phydev->duplex);
 
469
        
 
470
        idx++;
 
471
 
 
472
        idx = phy_find_valid(idx, phydev->supported);
 
473
 
 
474
        phydev->speed = settings[idx].speed;
 
475
        phydev->duplex = settings[idx].duplex;
 
476
 
 
477
        pr_info("Trying %d/%s\n", phydev->speed,
 
478
                        DUPLEX_FULL == phydev->duplex ?
 
479
                        "FULL" : "HALF");
 
480
}
 
481
 
 
482
 
 
483
/**
 
484
 * phy_error - enter HALTED state for this PHY device
 
485
 * @phydev: target phy_device struct
 
486
 *
 
487
 * Moves the PHY to the HALTED state in response to a read
 
488
 * or write error, and tells the controller the link is down.
 
489
 * Must not be called from interrupt context, or while the
 
490
 * phydev->lock is held.
 
491
 */
 
492
static void phy_error(struct phy_device *phydev)
 
493
{
 
494
        mutex_lock(&phydev->lock);
 
495
        phydev->state = PHY_HALTED;
 
496
        mutex_unlock(&phydev->lock);
 
497
}
 
498
 
 
499
/**
 
500
 * phy_interrupt - PHY interrupt handler
 
501
 * @irq: interrupt line
 
502
 * @phy_dat: phy_device pointer
 
503
 *
 
504
 * Description: When a PHY interrupt occurs, the handler disables
 
505
 * interrupts, and schedules a work task to clear the interrupt.
 
506
 */
 
507
static irqreturn_t phy_interrupt(int irq, void *phy_dat)
 
508
{
 
509
        struct phy_device *phydev = phy_dat;
 
510
 
 
511
        if (PHY_HALTED == phydev->state)
 
512
                return IRQ_NONE;                /* It can't be ours.  */
 
513
 
 
514
        /* The MDIO bus is not allowed to be written in interrupt
 
515
         * context, so we need to disable the irq here.  A work
 
516
         * queue will write the PHY to disable and clear the
 
517
         * interrupt, and then reenable the irq line. */
 
518
        disable_irq_nosync(irq);
 
519
        atomic_inc(&phydev->irq_disable);
 
520
 
 
521
        schedule_work(&phydev->phy_queue);
 
522
 
 
523
        return IRQ_HANDLED;
 
524
}
 
525
 
 
526
/**
 
527
 * phy_enable_interrupts - Enable the interrupts from the PHY side
 
528
 * @phydev: target phy_device struct
 
529
 */
 
530
int phy_enable_interrupts(struct phy_device *phydev)
 
531
{
 
532
        int err;
 
533
 
 
534
        err = phy_clear_interrupt(phydev);
 
535
 
 
536
        if (err < 0)
 
537
                return err;
 
538
 
 
539
        err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 
540
 
 
541
        return err;
 
542
}
 
543
EXPORT_SYMBOL(phy_enable_interrupts);
 
544
 
 
545
/**
 
546
 * phy_disable_interrupts - Disable the PHY interrupts from the PHY side
 
547
 * @phydev: target phy_device struct
 
548
 */
 
549
int phy_disable_interrupts(struct phy_device *phydev)
 
550
{
 
551
        int err;
 
552
 
 
553
        /* Disable PHY interrupts */
 
554
        err = phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 
555
 
 
556
        if (err)
 
557
                goto phy_err;
 
558
 
 
559
        /* Clear the interrupt */
 
560
        err = phy_clear_interrupt(phydev);
 
561
 
 
562
        if (err)
 
563
                goto phy_err;
 
564
 
 
565
        return 0;
 
566
 
 
567
phy_err:
 
568
        phy_error(phydev);
 
569
 
 
570
        return err;
 
571
}
 
572
EXPORT_SYMBOL(phy_disable_interrupts);
 
573
 
 
574
/**
 
575
 * phy_start_interrupts - request and enable interrupts for a PHY device
 
576
 * @phydev: target phy_device struct
 
577
 *
 
578
 * Description: Request the interrupt for the given PHY.
 
579
 *   If this fails, then we set irq to PHY_POLL.
 
580
 *   Otherwise, we enable the interrupts in the PHY.
 
581
 *   This should only be called with a valid IRQ number.
 
582
 *   Returns 0 on success or < 0 on error.
 
583
 */
 
584
int phy_start_interrupts(struct phy_device *phydev)
 
585
{
 
586
        int err = 0;
 
587
 
 
588
        INIT_WORK(&phydev->phy_queue, phy_change);
 
589
 
 
590
        atomic_set(&phydev->irq_disable, 0);
 
591
        if (request_irq(phydev->irq, phy_interrupt,
 
592
                                IRQF_SHARED,
 
593
                                "phy_interrupt",
 
594
                                phydev) < 0) {
 
595
                printk(KERN_WARNING "%s: Can't get IRQ %d (PHY)\n",
 
596
                                phydev->bus->name,
 
597
                                phydev->irq);
 
598
                phydev->irq = PHY_POLL;
 
599
                return 0;
 
600
        }
 
601
 
 
602
        err = phy_enable_interrupts(phydev);
 
603
 
 
604
        return err;
 
605
}
 
606
EXPORT_SYMBOL(phy_start_interrupts);
 
607
 
 
608
/**
 
609
 * phy_stop_interrupts - disable interrupts from a PHY device
 
610
 * @phydev: target phy_device struct
 
611
 */
 
612
int phy_stop_interrupts(struct phy_device *phydev)
 
613
{
 
614
        int err;
 
615
 
 
616
        err = phy_disable_interrupts(phydev);
 
617
 
 
618
        if (err)
 
619
                phy_error(phydev);
 
620
 
 
621
        free_irq(phydev->irq, phydev);
 
622
 
 
623
        /*
 
624
         * Cannot call flush_scheduled_work() here as desired because
 
625
         * of rtnl_lock(), but we do not really care about what would
 
626
         * be done, except from enable_irq(), so cancel any work
 
627
         * possibly pending and take care of the matter below.
 
628
         */
 
629
        cancel_work_sync(&phydev->phy_queue);
 
630
        /*
 
631
         * If work indeed has been cancelled, disable_irq() will have
 
632
         * been left unbalanced from phy_interrupt() and enable_irq()
 
633
         * has to be called so that other devices on the line work.
 
634
         */
 
635
        while (atomic_dec_return(&phydev->irq_disable) >= 0)
 
636
                enable_irq(phydev->irq);
 
637
 
 
638
        return err;
 
639
}
 
640
EXPORT_SYMBOL(phy_stop_interrupts);
 
641
 
 
642
 
 
643
/**
 
644
 * phy_change - Scheduled by the phy_interrupt/timer to handle PHY changes
 
645
 * @work: work_struct that describes the work to be done
 
646
 */
 
647
static void phy_change(struct work_struct *work)
 
648
{
 
649
        int err;
 
650
        struct phy_device *phydev =
 
651
                container_of(work, struct phy_device, phy_queue);
 
652
 
 
653
        if (phydev->drv->did_interrupt &&
 
654
            !phydev->drv->did_interrupt(phydev))
 
655
                goto ignore;
 
656
 
 
657
        err = phy_disable_interrupts(phydev);
 
658
 
 
659
        if (err)
 
660
                goto phy_err;
 
661
 
 
662
        mutex_lock(&phydev->lock);
 
663
        if ((PHY_RUNNING == phydev->state) || (PHY_NOLINK == phydev->state))
 
664
                phydev->state = PHY_CHANGELINK;
 
665
        mutex_unlock(&phydev->lock);
 
666
 
 
667
        atomic_dec(&phydev->irq_disable);
 
668
        enable_irq(phydev->irq);
 
669
 
 
670
        /* Reenable interrupts */
 
671
        if (PHY_HALTED != phydev->state)
 
672
                err = phy_config_interrupt(phydev, PHY_INTERRUPT_ENABLED);
 
673
 
 
674
        if (err)
 
675
                goto irq_enable_err;
 
676
 
 
677
        /* reschedule state queue work to run as soon as possible */
 
678
        cancel_delayed_work_sync(&phydev->state_queue);
 
679
        schedule_delayed_work(&phydev->state_queue, 0);
 
680
 
 
681
        return;
 
682
 
 
683
ignore:
 
684
        atomic_dec(&phydev->irq_disable);
 
685
        enable_irq(phydev->irq);
 
686
        return;
 
687
 
 
688
irq_enable_err:
 
689
        disable_irq(phydev->irq);
 
690
        atomic_inc(&phydev->irq_disable);
 
691
phy_err:
 
692
        phy_error(phydev);
 
693
}
 
694
 
 
695
/**
 
696
 * phy_stop - Bring down the PHY link, and stop checking the status
 
697
 * @phydev: target phy_device struct
 
698
 */
 
699
void phy_stop(struct phy_device *phydev)
 
700
{
 
701
        mutex_lock(&phydev->lock);
 
702
 
 
703
        if (PHY_HALTED == phydev->state)
 
704
                goto out_unlock;
 
705
 
 
706
        if (phydev->irq != PHY_POLL) {
 
707
                /* Disable PHY Interrupts */
 
708
                phy_config_interrupt(phydev, PHY_INTERRUPT_DISABLED);
 
709
 
 
710
                /* Clear any pending interrupts */
 
711
                phy_clear_interrupt(phydev);
 
712
        }
 
713
 
 
714
        phydev->state = PHY_HALTED;
 
715
 
 
716
out_unlock:
 
717
        mutex_unlock(&phydev->lock);
 
718
 
 
719
        /*
 
720
         * Cannot call flush_scheduled_work() here as desired because
 
721
         * of rtnl_lock(), but PHY_HALTED shall guarantee phy_change()
 
722
         * will not reenable interrupts.
 
723
         */
 
724
}
 
725
 
 
726
 
 
727
/**
 
728
 * phy_start - start or restart a PHY device
 
729
 * @phydev: target phy_device struct
 
730
 *
 
731
 * Description: Indicates the attached device's readiness to
 
732
 *   handle PHY-related work.  Used during startup to start the
 
733
 *   PHY, and after a call to phy_stop() to resume operation.
 
734
 *   Also used to indicate the MDIO bus has cleared an error
 
735
 *   condition.
 
736
 */
 
737
void phy_start(struct phy_device *phydev)
 
738
{
 
739
        mutex_lock(&phydev->lock);
 
740
 
 
741
        switch (phydev->state) {
 
742
                case PHY_STARTING:
 
743
                        phydev->state = PHY_PENDING;
 
744
                        break;
 
745
                case PHY_READY:
 
746
                        phydev->state = PHY_UP;
 
747
                        break;
 
748
                case PHY_HALTED:
 
749
                        phydev->state = PHY_RESUMING;
 
750
                default:
 
751
                        break;
 
752
        }
 
753
        mutex_unlock(&phydev->lock);
 
754
}
 
755
EXPORT_SYMBOL(phy_stop);
 
756
EXPORT_SYMBOL(phy_start);
 
757
 
 
758
/**
 
759
 * phy_state_machine - Handle the state machine
 
760
 * @work: work_struct that describes the work to be done
 
761
 */
 
762
void phy_state_machine(struct work_struct *work)
 
763
{
 
764
        struct delayed_work *dwork = to_delayed_work(work);
 
765
        struct phy_device *phydev =
 
766
                        container_of(dwork, struct phy_device, state_queue);
 
767
        int needs_aneg = 0;
 
768
        int err = 0;
 
769
 
 
770
        mutex_lock(&phydev->lock);
 
771
 
 
772
        if (phydev->adjust_state)
 
773
                phydev->adjust_state(phydev->attached_dev);
 
774
 
 
775
        switch(phydev->state) {
 
776
                case PHY_DOWN:
 
777
                case PHY_STARTING:
 
778
                case PHY_READY:
 
779
                case PHY_PENDING:
 
780
                        break;
 
781
                case PHY_UP:
 
782
                        needs_aneg = 1;
 
783
 
 
784
                        phydev->link_timeout = PHY_AN_TIMEOUT;
 
785
 
 
786
                        break;
 
787
                case PHY_AN:
 
788
                        err = phy_read_status(phydev);
 
789
 
 
790
                        if (err < 0)
 
791
                                break;
 
792
 
 
793
                        /* If the link is down, give up on
 
794
                         * negotiation for now */
 
795
                        if (!phydev->link) {
 
796
                                phydev->state = PHY_NOLINK;
 
797
                                netif_carrier_off(phydev->attached_dev);
 
798
                                phydev->adjust_link(phydev->attached_dev);
 
799
                                break;
 
800
                        }
 
801
 
 
802
                        /* Check if negotiation is done.  Break
 
803
                         * if there's an error */
 
804
                        err = phy_aneg_done(phydev);
 
805
                        if (err < 0)
 
806
                                break;
 
807
 
 
808
                        /* If AN is done, we're running */
 
809
                        if (err > 0) {
 
810
                                phydev->state = PHY_RUNNING;
 
811
                                netif_carrier_on(phydev->attached_dev);
 
812
                                phydev->adjust_link(phydev->attached_dev);
 
813
 
 
814
                        } else if (0 == phydev->link_timeout--) {
 
815
                                int idx;
 
816
 
 
817
                                needs_aneg = 1;
 
818
                                /* If we have the magic_aneg bit,
 
819
                                 * we try again */
 
820
                                if (phydev->drv->flags & PHY_HAS_MAGICANEG)
 
821
                                        break;
 
822
 
 
823
                                /* The timer expired, and we still
 
824
                                 * don't have a setting, so we try
 
825
                                 * forcing it until we find one that
 
826
                                 * works, starting from the fastest speed,
 
827
                                 * and working our way down */
 
828
                                idx = phy_find_valid(0, phydev->supported);
 
829
 
 
830
                                phydev->speed = settings[idx].speed;
 
831
                                phydev->duplex = settings[idx].duplex;
 
832
 
 
833
                                phydev->autoneg = AUTONEG_DISABLE;
 
834
 
 
835
                                pr_info("Trying %d/%s\n", phydev->speed,
 
836
                                                DUPLEX_FULL ==
 
837
                                                phydev->duplex ?
 
838
                                                "FULL" : "HALF");
 
839
                        }
 
840
                        break;
 
841
                case PHY_NOLINK:
 
842
                        err = phy_read_status(phydev);
 
843
 
 
844
                        if (err)
 
845
                                break;
 
846
 
 
847
                        if (phydev->link) {
 
848
                                phydev->state = PHY_RUNNING;
 
849
                                netif_carrier_on(phydev->attached_dev);
 
850
                                phydev->adjust_link(phydev->attached_dev);
 
851
                        }
 
852
                        break;
 
853
                case PHY_FORCING:
 
854
                        err = genphy_update_link(phydev);
 
855
 
 
856
                        if (err)
 
857
                                break;
 
858
 
 
859
                        if (phydev->link) {
 
860
                                phydev->state = PHY_RUNNING;
 
861
                                netif_carrier_on(phydev->attached_dev);
 
862
                        } else {
 
863
                                if (0 == phydev->link_timeout--) {
 
864
                                        phy_force_reduction(phydev);
 
865
                                        needs_aneg = 1;
 
866
                                }
 
867
                        }
 
868
 
 
869
                        phydev->adjust_link(phydev->attached_dev);
 
870
                        break;
 
871
                case PHY_RUNNING:
 
872
                        /* Only register a CHANGE if we are
 
873
                         * polling */
 
874
                        if (PHY_POLL == phydev->irq)
 
875
                                phydev->state = PHY_CHANGELINK;
 
876
                        break;
 
877
                case PHY_CHANGELINK:
 
878
                        err = phy_read_status(phydev);
 
879
 
 
880
                        if (err)
 
881
                                break;
 
882
 
 
883
                        if (phydev->link) {
 
884
                                phydev->state = PHY_RUNNING;
 
885
                                netif_carrier_on(phydev->attached_dev);
 
886
                        } else {
 
887
                                phydev->state = PHY_NOLINK;
 
888
                                netif_carrier_off(phydev->attached_dev);
 
889
                        }
 
890
 
 
891
                        phydev->adjust_link(phydev->attached_dev);
 
892
 
 
893
                        if (PHY_POLL != phydev->irq)
 
894
                                err = phy_config_interrupt(phydev,
 
895
                                                PHY_INTERRUPT_ENABLED);
 
896
                        break;
 
897
                case PHY_HALTED:
 
898
                        if (phydev->link) {
 
899
                                phydev->link = 0;
 
900
                                netif_carrier_off(phydev->attached_dev);
 
901
                                phydev->adjust_link(phydev->attached_dev);
 
902
                        }
 
903
                        break;
 
904
                case PHY_RESUMING:
 
905
 
 
906
                        err = phy_clear_interrupt(phydev);
 
907
 
 
908
                        if (err)
 
909
                                break;
 
910
 
 
911
                        err = phy_config_interrupt(phydev,
 
912
                                        PHY_INTERRUPT_ENABLED);
 
913
 
 
914
                        if (err)
 
915
                                break;
 
916
 
 
917
                        if (AUTONEG_ENABLE == phydev->autoneg) {
 
918
                                err = phy_aneg_done(phydev);
 
919
                                if (err < 0)
 
920
                                        break;
 
921
 
 
922
                                /* err > 0 if AN is done.
 
923
                                 * Otherwise, it's 0, and we're
 
924
                                 * still waiting for AN */
 
925
                                if (err > 0) {
 
926
                                        err = phy_read_status(phydev);
 
927
                                        if (err)
 
928
                                                break;
 
929
 
 
930
                                        if (phydev->link) {
 
931
                                                phydev->state = PHY_RUNNING;
 
932
                                                netif_carrier_on(phydev->attached_dev);
 
933
                                        } else
 
934
                                                phydev->state = PHY_NOLINK;
 
935
                                        phydev->adjust_link(phydev->attached_dev);
 
936
                                } else {
 
937
                                        phydev->state = PHY_AN;
 
938
                                        phydev->link_timeout = PHY_AN_TIMEOUT;
 
939
                                }
 
940
                        } else {
 
941
                                err = phy_read_status(phydev);
 
942
                                if (err)
 
943
                                        break;
 
944
 
 
945
                                if (phydev->link) {
 
946
                                        phydev->state = PHY_RUNNING;
 
947
                                        netif_carrier_on(phydev->attached_dev);
 
948
                                } else
 
949
                                        phydev->state = PHY_NOLINK;
 
950
                                phydev->adjust_link(phydev->attached_dev);
 
951
                        }
 
952
                        break;
 
953
        }
 
954
 
 
955
        mutex_unlock(&phydev->lock);
 
956
 
 
957
        if (needs_aneg)
 
958
                err = phy_start_aneg(phydev);
 
959
 
 
960
        if (err < 0)
 
961
                phy_error(phydev);
 
962
 
 
963
        schedule_delayed_work(&phydev->state_queue, PHY_STATE_TIME * HZ);
 
964
}