summaryrefslogtreecommitdiff
path: root/drivers/ssb/driver_chipcommon.c
blob: 3861cb659cb941aa46414686d60797592750ae2f (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
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
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
/*
 * Sonics Silicon Backplane
 * Broadcom ChipCommon core driver
 *
 * Copyright 2005, Broadcom Corporation
 * Copyright 2006, 2007, Michael Buesch <m@bues.ch>
 * Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de>
 *
 * Licensed under the GNU/GPL. See COPYING for details.
 */

#include "ssb_private.h"

#include <linux/ssb/ssb.h>
#include <linux/ssb/ssb_regs.h>
#include <linux/export.h>
#include <linux/pci.h>
#include <linux/bcm47xx_wdt.h>


/* Clock sources */
enum ssb_clksrc {
	/* PCI clock */
	SSB_CHIPCO_CLKSRC_PCI,
	/* Crystal slow clock oscillator */
	SSB_CHIPCO_CLKSRC_XTALOS,
	/* Low power oscillator */
	SSB_CHIPCO_CLKSRC_LOPWROS,
};


static inline u32 chipco_write32_masked(struct ssb_chipcommon *cc, u16 offset,
					u32 mask, u32 value)
{
	value &= mask;
	value |= chipco_read32(cc, offset) & ~mask;
	chipco_write32(cc, offset, value);

	return value;
}

void ssb_chipco_set_clockmode(struct ssb_chipcommon *cc,
			      enum ssb_clkmode mode)
{
	struct ssb_device *ccdev = cc->dev;
	struct ssb_bus *bus;
	u32 tmp;

	if (!ccdev)
		return;
	bus = ccdev->bus;

	/* We support SLOW only on 6..9 */
	if (ccdev->id.revision >= 10 && mode == SSB_CLKMODE_SLOW)
		mode = SSB_CLKMODE_DYNAMIC;

	if (cc->capabilities & SSB_CHIPCO_CAP_PMU)
		return; /* PMU controls clockmode, separated function needed */
	WARN_ON(ccdev->id.revision >= 20);

	/* chipcommon cores prior to rev6 don't support dynamic clock control */
	if (ccdev->id.revision < 6)
		return;

	/* ChipCommon cores rev10+ need testing */
	if (ccdev->id.revision >= 10)
		return;

	if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
		return;

	switch (mode) {
	case SSB_CLKMODE_SLOW: /* For revs 6..9 only */
		tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
		tmp |= SSB_CHIPCO_SLOWCLKCTL_FSLOW;
		chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);
		break;
	case SSB_CLKMODE_FAST:
		if (ccdev->id.revision < 10) {
			ssb_pci_xtal(bus, SSB_GPIO_XTAL, 1); /* Force crystal on */
			tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
			tmp &= ~SSB_CHIPCO_SLOWCLKCTL_FSLOW;
			tmp |= SSB_CHIPCO_SLOWCLKCTL_IPLL;
			chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);
		} else {
			chipco_write32(cc, SSB_CHIPCO_SYSCLKCTL,
				(chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL) |
				 SSB_CHIPCO_SYSCLKCTL_FORCEHT));
			/* udelay(150); TODO: not available in early init */
		}
		break;
	case SSB_CLKMODE_DYNAMIC:
		if (ccdev->id.revision < 10) {
			tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
			tmp &= ~SSB_CHIPCO_SLOWCLKCTL_FSLOW;
			tmp &= ~SSB_CHIPCO_SLOWCLKCTL_IPLL;
			tmp &= ~SSB_CHIPCO_SLOWCLKCTL_ENXTAL;
			if ((tmp & SSB_CHIPCO_SLOWCLKCTL_SRC) !=
			    SSB_CHIPCO_SLOWCLKCTL_SRC_XTAL)
				tmp |= SSB_CHIPCO_SLOWCLKCTL_ENXTAL;
			chipco_write32(cc, SSB_CHIPCO_SLOWCLKCTL, tmp);

			/* For dynamic control, we have to release our xtal_pu
			 * "force on" */
			if (tmp & SSB_CHIPCO_SLOWCLKCTL_ENXTAL)
				ssb_pci_xtal(bus, SSB_GPIO_XTAL, 0);
		} else {
			chipco_write32(cc, SSB_CHIPCO_SYSCLKCTL,
				(chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL) &
				 ~SSB_CHIPCO_SYSCLKCTL_FORCEHT));
		}
		break;
	default:
		WARN_ON(1);
	}
}

/* Get the Slow Clock Source */
static enum ssb_clksrc chipco_pctl_get_slowclksrc(struct ssb_chipcommon *cc)
{
	struct ssb_bus *bus = cc->dev->bus;
	u32 uninitialized_var(tmp);

	if (cc->dev->id.revision < 6) {
		if (bus->bustype == SSB_BUSTYPE_SSB ||
		    bus->bustype == SSB_BUSTYPE_PCMCIA)
			return SSB_CHIPCO_CLKSRC_XTALOS;
		if (bus->bustype == SSB_BUSTYPE_PCI) {
			pci_read_config_dword(bus->host_pci, SSB_GPIO_OUT, &tmp);
			if (tmp & 0x10)
				return SSB_CHIPCO_CLKSRC_PCI;
			return SSB_CHIPCO_CLKSRC_XTALOS;
		}
	}
	if (cc->dev->id.revision < 10) {
		tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
		tmp &= 0x7;
		if (tmp == 0)
			return SSB_CHIPCO_CLKSRC_LOPWROS;
		if (tmp == 1)
			return SSB_CHIPCO_CLKSRC_XTALOS;
		if (tmp == 2)
			return SSB_CHIPCO_CLKSRC_PCI;
	}

	return SSB_CHIPCO_CLKSRC_XTALOS;
}

/* Get maximum or minimum (depending on get_max flag) slowclock frequency. */
static int chipco_pctl_clockfreqlimit(struct ssb_chipcommon *cc, int get_max)
{
	int uninitialized_var(limit);
	enum ssb_clksrc clocksrc;
	int divisor = 1;
	u32 tmp;

	clocksrc = chipco_pctl_get_slowclksrc(cc);
	if (cc->dev->id.revision < 6) {
		switch (clocksrc) {
		case SSB_CHIPCO_CLKSRC_PCI:
			divisor = 64;
			break;
		case SSB_CHIPCO_CLKSRC_XTALOS:
			divisor = 32;
			break;
		default:
			WARN_ON(1);
		}
	} else if (cc->dev->id.revision < 10) {
		switch (clocksrc) {
		case SSB_CHIPCO_CLKSRC_LOPWROS:
			break;
		case SSB_CHIPCO_CLKSRC_XTALOS:
		case SSB_CHIPCO_CLKSRC_PCI:
			tmp = chipco_read32(cc, SSB_CHIPCO_SLOWCLKCTL);
			divisor = (tmp >> 16) + 1;
			divisor *= 4;
			break;
		}
	} else {
		tmp = chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL);
		divisor = (tmp >> 16) + 1;
		divisor *= 4;
	}

	switch (clocksrc) {
	case SSB_CHIPCO_CLKSRC_LOPWROS:
		if (get_max)
			limit = 43000;
		else
			limit = 25000;
		break;
	case SSB_CHIPCO_CLKSRC_XTALOS:
		if (get_max)
			limit = 20200000;
		else
			limit = 19800000;
		break;
	case SSB_CHIPCO_CLKSRC_PCI:
		if (get_max)
			limit = 34000000;
		else
			limit = 25000000;
		break;
	}
	limit /= divisor;

	return limit;
}

static void chipco_powercontrol_init(struct ssb_chipcommon *cc)
{
	struct ssb_bus *bus = cc->dev->bus;

	if (bus->chip_id == 0x4321) {
		if (bus->chip_rev == 0)
			chipco_write32(cc, SSB_CHIPCO_CHIPCTL, 0x3A4);
		else if (bus->chip_rev == 1)
			chipco_write32(cc, SSB_CHIPCO_CHIPCTL, 0xA4);
	}

	if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
		return;

	if (cc->dev->id.revision >= 10) {
		/* Set Idle Power clock rate to 1Mhz */
		chipco_write32(cc, SSB_CHIPCO_SYSCLKCTL,
			       (chipco_read32(cc, SSB_CHIPCO_SYSCLKCTL) &
				0x0000FFFF) | 0x00040000);
	} else {
		int maxfreq;

		maxfreq = chipco_pctl_clockfreqlimit(cc, 1);
		chipco_write32(cc, SSB_CHIPCO_PLLONDELAY,
			       (maxfreq * 150 + 999999) / 1000000);
		chipco_write32(cc, SSB_CHIPCO_FREFSELDELAY,
			       (maxfreq * 15 + 999999) / 1000000);
	}
}

/* http://bcm-v4.sipsolutions.net/802.11/PmuFastPwrupDelay */
static u16 pmu_fast_powerup_delay(struct ssb_chipcommon *cc)
{
	struct ssb_bus *bus = cc->dev->bus;

	switch (bus->chip_id) {
	case 0x4312:
	case 0x4322:
	case 0x4328:
		return 7000;
	case 0x4325:
		/* TODO: */
	default:
		return 15000;
	}
}

/* http://bcm-v4.sipsolutions.net/802.11/ClkctlFastPwrupDelay */
static void calc_fast_powerup_delay(struct ssb_chipcommon *cc)
{
	struct ssb_bus *bus = cc->dev->bus;
	int minfreq;
	unsigned int tmp;
	u32 pll_on_delay;

	if (bus->bustype != SSB_BUSTYPE_PCI)
		return;

	if (cc->capabilities & SSB_CHIPCO_CAP_PMU) {
		cc->fast_pwrup_delay = pmu_fast_powerup_delay(cc);
		return;
	}

	if (!(cc->capabilities & SSB_CHIPCO_CAP_PCTL))
		return;

	minfreq = chipco_pctl_clockfreqlimit(cc, 0);
	pll_on_delay = chipco_read32(cc, SSB_CHIPCO_PLLONDELAY);
	tmp = (((pll_on_delay + 2) * 1000000) + (minfreq - 1)) / minfreq;
	WARN_ON(tmp & ~0xFFFF);

	cc->fast_pwrup_delay = tmp;
}

static u32 ssb_chipco_alp_clock(struct ssb_chipcommon *cc)
{
	if (cc->capabilities & SSB_CHIPCO_CAP_PMU)
		return ssb_pmu_get_alp_clock(cc);

	return 20000000;
}

static u32 ssb_chipco_watchdog_get_max_timer(struct ssb_chipcommon *cc)
{
	u32 nb;

	if (cc->capabilities & SSB_CHIPCO_CAP_PMU) {
		if (cc->dev->id.revision < 26)
			nb = 16;
		else
			nb = (cc->dev->id.revision >= 37) ? 32 : 24;
	} else {
		nb = 28;
	}
	if (nb == 32)
		return 0xffffffff;
	else
		return (1 << nb) - 1;
}

u32 ssb_chipco_watchdog_timer_set_wdt(struct bcm47xx_wdt *wdt, u32 ticks)
{
	struct ssb_chipcommon *cc = bcm47xx_wdt_get_drvdata(wdt);

	if (cc->dev->bus->bustype != SSB_BUSTYPE_SSB)
		return 0;

	return ssb_chipco_watchdog_timer_set(cc, ticks);
}

u32 ssb_chipco_watchdog_timer_set_ms(struct bcm47xx_wdt *wdt, u32 ms)
{
	struct ssb_chipcommon *cc = bcm47xx_wdt_get_drvdata(wdt);
	u32 ticks;

	if (cc->dev->bus->bustype != SSB_BUSTYPE_SSB)
		return 0;

	ticks = ssb_chipco_watchdog_timer_set(cc, cc->ticks_per_ms * ms);
	return ticks / cc->ticks_per_ms;
}

static int ssb_chipco_watchdog_ticks_per_ms(struct ssb_chipcommon *cc)
{
	struct ssb_bus *bus = cc->dev->bus;

	if (cc->capabilities & SSB_CHIPCO_CAP_PMU) {
			/* based on 32KHz ILP clock */
			return 32;
	} else {
		if (cc->dev->id.revision < 18)
			return ssb_clockspeed(bus) / 1000;
		else
			return ssb_chipco_alp_clock(cc) / 1000;
	}
}

void ssb_chipcommon_init(struct ssb_chipcommon *cc)
{
	if (!cc->dev)
		return; /* We don't have a ChipCommon */

	spin_lock_init(&cc->gpio_lock);

	if (cc->dev->id.revision >= 11)
		cc->status = chipco_read32(cc, SSB_CHIPCO_CHIPSTAT);
	dev_dbg(cc->dev->dev, "chipcommon status is 0x%x\n", cc->status);

	if (cc->dev->id.revision >= 20) {
		chipco_write32(cc, SSB_CHIPCO_GPIOPULLUP, 0);
		chipco_write32(cc, SSB_CHIPCO_GPIOPULLDOWN, 0);
	}

	ssb_pmu_init(cc);
	chipco_powercontrol_init(cc);
	ssb_chipco_set_clockmode(cc, SSB_CLKMODE_FAST);
	calc_fast_powerup_delay(cc);

	if (cc->dev->bus->bustype == SSB_BUSTYPE_SSB) {
		cc->ticks_per_ms = ssb_chipco_watchdog_ticks_per_ms(cc);
		cc->max_timer_ms = ssb_chipco_watchdog_get_max_timer(cc) / cc->ticks_per_ms;
	}
}

void ssb_chipco_suspend(struct ssb_chipcommon *cc)
{
	if (!cc->dev)
		return;
	ssb_chipco_set_clockmode(cc, SSB_CLKMODE_SLOW);
}

void ssb_chipco_resume(struct ssb_chipcommon *cc)
{
	if (!cc->dev)
		return;
	chipco_powercontrol_init(cc);
	ssb_chipco_set_clockmode(cc, SSB_CLKMODE_FAST);
}

/* Get the processor clock */
void ssb_chipco_get_clockcpu(struct ssb_chipcommon *cc,
                             u32 *plltype, u32 *n, u32 *m)
{
	*n = chipco_read32(cc, SSB_CHIPCO_CLOCK_N);
	*plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT);
	switch (*plltype) {
	case SSB_PLLTYPE_2:
	case SSB_PLLTYPE_4:
	case SSB_PLLTYPE_6:
	case SSB_PLLTYPE_7:
		*m = chipco_read32(cc, SSB_CHIPCO_CLOCK_MIPS);
		break;
	case SSB_PLLTYPE_3:
		/* 5350 uses m2 to control mips */
		*m = chipco_read32(cc, SSB_CHIPCO_CLOCK_M2);
		break;
	default:
		*m = chipco_read32(cc, SSB_CHIPCO_CLOCK_SB);
		break;
	}
}

/* Get the bus clock */
void ssb_chipco_get_clockcontrol(struct ssb_chipcommon *cc,
				 u32 *plltype, u32 *n, u32 *m)
{
	*n = chipco_read32(cc, SSB_CHIPCO_CLOCK_N);
	*plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT);
	switch (*plltype) {
	case SSB_PLLTYPE_6: /* 100/200 or 120/240 only */
		*m = chipco_read32(cc, SSB_CHIPCO_CLOCK_MIPS);
		break;
	case SSB_PLLTYPE_3: /* 25Mhz, 2 dividers */
		if (cc->dev->bus->chip_id != 0x5365) {
			*m = chipco_read32(cc, SSB_CHIPCO_CLOCK_M2);
			break;
		}
		/* Fall through */
	default:
		*m = chipco_read32(cc, SSB_CHIPCO_CLOCK_SB);
	}
}

void ssb_chipco_timing_init(struct ssb_chipcommon *cc,
			    unsigned long ns)
{
	struct ssb_device *dev = cc->dev;
	struct ssb_bus *bus = dev->bus;
	u32 tmp;

	/* set register for external IO to control LED. */
	chipco_write32(cc, SSB_CHIPCO_PROG_CFG, 0x11);
	tmp = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT;		/* Waitcount-3 = 10ns */
	tmp |= DIV_ROUND_UP(40, ns) << SSB_PROG_WCNT_1_SHIFT;	/* Waitcount-1 = 40ns */
	tmp |= DIV_ROUND_UP(240, ns);				/* Waitcount-0 = 240ns */
	chipco_write32(cc, SSB_CHIPCO_PROG_WAITCNT, tmp);	/* 0x01020a0c for a 100Mhz clock */

	/* Set timing for the flash */
	tmp = DIV_ROUND_UP(10, ns) << SSB_FLASH_WCNT_3_SHIFT;	/* Waitcount-3 = 10nS */
	tmp |= DIV_ROUND_UP(10, ns) << SSB_FLASH_WCNT_1_SHIFT;	/* Waitcount-1 = 10nS */
	tmp |= DIV_ROUND_UP(120, ns);				/* Waitcount-0 = 120nS */
	if ((bus->chip_id == 0x5365) ||
	    (dev->id.revision < 9))
		chipco_write32(cc, SSB_CHIPCO_FLASH_WAITCNT, tmp);
	if ((bus->chip_id == 0x5365) ||
	    (dev->id.revision < 9) ||
	    ((bus->chip_id == 0x5350) && (bus->chip_rev == 0)))
		chipco_write32(cc, SSB_CHIPCO_PCMCIA_MEMWAIT, tmp);

	if (bus->chip_id == 0x5350) {
		/* Enable EXTIF */
		tmp = DIV_ROUND_UP(10, ns) << SSB_PROG_WCNT_3_SHIFT;	  /* Waitcount-3 = 10ns */
		tmp |= DIV_ROUND_UP(20, ns) << SSB_PROG_WCNT_2_SHIFT;  /* Waitcount-2 = 20ns */
		tmp |= DIV_ROUND_UP(100, ns) << SSB_PROG_WCNT_1_SHIFT; /* Waitcount-1 = 100ns */
		tmp |= DIV_ROUND_UP(120, ns);			  /* Waitcount-0 = 120ns */
		chipco_write32(cc, SSB_CHIPCO_PROG_WAITCNT, tmp); /* 0x01020a0c for a 100Mhz clock */
	}
}

/* Set chip watchdog reset timer to fire in 'ticks' backplane cycles */
u32 ssb_chipco_watchdog_timer_set(struct ssb_chipcommon *cc, u32 ticks)
{
	u32 maxt;
	enum ssb_clkmode clkmode;

	maxt = ssb_chipco_watchdog_get_max_timer(cc);
	if (cc->capabilities & SSB_CHIPCO_CAP_PMU) {
		if (ticks == 1)
			ticks = 2;
		else if (ticks > maxt)
			ticks = maxt;
		chipco_write32(cc, SSB_CHIPCO_PMU_WATCHDOG, ticks);
	} else {
		clkmode = ticks ? SSB_CLKMODE_FAST : SSB_CLKMODE_DYNAMIC;
		ssb_chipco_set_clockmode(cc, clkmode);
		if (ticks > maxt)
			ticks = maxt;
		/* instant NMI */
		chipco_write32(cc, SSB_CHIPCO_WATCHDOG, ticks);
	}
	return ticks;
}

void ssb_chipco_irq_mask(struct ssb_chipcommon *cc, u32 mask, u32 value)
{
	chipco_write32_masked(cc, SSB_CHIPCO_IRQMASK, mask, value);
}

u32 ssb_chipco_irq_status(struct ssb_chipcommon *cc, u32 mask)
{
	return chipco_read32(cc, SSB_CHIPCO_IRQSTAT) & mask;
}

u32 ssb_chipco_gpio_in(struct ssb_chipcommon *cc, u32 mask)
{
	return chipco_read32(cc, SSB_CHIPCO_GPIOIN) & mask;
}

u32 ssb_chipco_gpio_out(struct ssb_chipcommon *cc, u32 mask, u32 value)
{
	unsigned long flags;
	u32 res = 0;

	spin_lock_irqsave(&cc->gpio_lock, flags);
	res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOOUT, mask, value);
	spin_unlock_irqrestore(&cc->gpio_lock, flags);

	return res;
}

u32 ssb_chipco_gpio_outen(struct ssb_chipcommon *cc, u32 mask, u32 value)
{
	unsigned long flags;
	u32 res = 0;

	spin_lock_irqsave(&cc->gpio_lock, flags);
	res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOOUTEN, mask, value);
	spin_unlock_irqrestore(&cc->gpio_lock, flags);

	return res;
}

u32 ssb_chipco_gpio_control(struct ssb_chipcommon *cc, u32 mask, u32 value)
{
	unsigned long flags;
	u32 res = 0;

	spin_lock_irqsave(&cc->gpio_lock, flags);
	res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOCTL, mask, value);
	spin_unlock_irqrestore(&cc->gpio_lock, flags);

	return res;
}
EXPORT_SYMBOL(ssb_chipco_gpio_control);

u32 ssb_chipco_gpio_intmask(struct ssb_chipcommon *cc, u32 mask, u32 value)
{
	unsigned long flags;
	u32 res = 0;

	spin_lock_irqsave(&cc->gpio_lock, flags);
	res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOIRQ, mask, value);
	spin_unlock_irqrestore(&cc->gpio_lock, flags);

	return res;
}

u32 ssb_chipco_gpio_polarity(struct ssb_chipcommon *cc, u32 mask, u32 value)
{
	unsigned long flags;
	u32 res = 0;

	spin_lock_irqsave(&cc->gpio_lock, flags);
	res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOPOL, mask, value);
	spin_unlock_irqrestore(&cc->gpio_lock, flags);

	return res;
}

u32 ssb_chipco_gpio_pullup(struct ssb_chipcommon *cc, u32 mask, u32 value)
{
	unsigned long flags;
	u32 res = 0;

	if (cc->dev->id.revision < 20)
		return 0xffffffff;

	spin_lock_irqsave(&cc->gpio_lock, flags);
	res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOPULLUP, mask, value);
	spin_unlock_irqrestore(&cc->gpio_lock, flags);

	return res;
}

u32 ssb_chipco_gpio_pulldown(struct ssb_chipcommon *cc, u32 mask, u32 value)
{
	unsigned long flags;
	u32 res = 0;

	if (cc->dev->id.revision < 20)
		return 0xffffffff;

	spin_lock_irqsave(&cc->gpio_lock, flags);
	res = chipco_write32_masked(cc, SSB_CHIPCO_GPIOPULLDOWN, mask, value);
	spin_unlock_irqrestore(&cc->gpio_lock, flags);

	return res;
}

#ifdef CONFIG_SSB_SERIAL
int ssb_chipco_serial_init(struct ssb_chipcommon *cc,
			   struct ssb_serial_port *ports)
{
	struct ssb_bus *bus = cc->dev->bus;
	int nr_ports = 0;
	u32 plltype;
	unsigned int irq;
	u32 baud_base, div;
	u32 i, n;
	unsigned int ccrev = cc->dev->id.revision;

	plltype = (cc->capabilities & SSB_CHIPCO_CAP_PLLT);
	irq = ssb_mips_irq(cc->dev);

	if (plltype == SSB_PLLTYPE_1) {
		/* PLL clock */
		baud_base = ssb_calc_clock_rate(plltype,
						chipco_read32(cc, SSB_CHIPCO_CLOCK_N),
						chipco_read32(cc, SSB_CHIPCO_CLOCK_M2));
		div = 1;
	} else {
		if (ccrev == 20) {
			/* BCM5354 uses constant 25MHz clock */
			baud_base = 25000000;
			div = 48;
			/* Set the override bit so we don't divide it */
			chipco_write32(cc, SSB_CHIPCO_CORECTL,
				       chipco_read32(cc, SSB_CHIPCO_CORECTL)
				       | SSB_CHIPCO_CORECTL_UARTCLK0);
		} else if ((ccrev >= 11) && (ccrev != 15)) {
			baud_base = ssb_chipco_alp_clock(cc);
			div = 1;
			if (ccrev >= 21) {
				/* Turn off UART clock before switching clocksource. */
				chipco_write32(cc, SSB_CHIPCO_CORECTL,
					       chipco_read32(cc, SSB_CHIPCO_CORECTL)
					       & ~SSB_CHIPCO_CORECTL_UARTCLKEN);
			}
			/* Set the override bit so we don't divide it */
			chipco_write32(cc, SSB_CHIPCO_CORECTL,
				       chipco_read32(cc, SSB_CHIPCO_CORECTL)
				       | SSB_CHIPCO_CORECTL_UARTCLK0);
			if (ccrev >= 21) {
				/* Re-enable the UART clock. */
				chipco_write32(cc, SSB_CHIPCO_CORECTL,
					       chipco_read32(cc, SSB_CHIPCO_CORECTL)
					       | SSB_CHIPCO_CORECTL_UARTCLKEN);
			}
		} else if (ccrev >= 3) {
			/* Internal backplane clock */
			baud_base = ssb_clockspeed(bus);
			div = chipco_read32(cc, SSB_CHIPCO_CLKDIV)
			      & SSB_CHIPCO_CLKDIV_UART;
		} else {
			/* Fixed internal backplane clock */
			baud_base = 88000000;
			div = 48;
		}

		/* Clock source depends on strapping if UartClkOverride is unset */
		if ((ccrev > 0) &&
		    !(chipco_read32(cc, SSB_CHIPCO_CORECTL) & SSB_CHIPCO_CORECTL_UARTCLK0)) {
			if ((cc->capabilities & SSB_CHIPCO_CAP_UARTCLK) ==
			    SSB_CHIPCO_CAP_UARTCLK_INT) {
				/* Internal divided backplane clock */
				baud_base /= div;
			} else {
				/* Assume external clock of 1.8432 MHz */
				baud_base = 1843200;
			}
		}
	}

	/* Determine the registers of the UARTs */
	n = (cc->capabilities & SSB_CHIPCO_CAP_NRUART);
	for (i = 0; i < n; i++) {
		void __iomem *cc_mmio;
		void __iomem *uart_regs;

		cc_mmio = cc->dev->bus->mmio + (cc->dev->core_index * SSB_CORE_SIZE);
		uart_regs = cc_mmio + SSB_CHIPCO_UART0_DATA;
		/* Offset changed at after rev 0 */
		if (ccrev == 0)
			uart_regs += (i * 8);
		else
			uart_regs += (i * 256);

		nr_ports++;
		ports[i].regs = uart_regs;
		ports[i].irq = irq;
		ports[i].baud_base = baud_base;
		ports[i].reg_shift = 0;
	}

	return nr_ports;
}
#endif /* CONFIG_SSB_SERIAL */