summaryrefslogtreecommitdiff
path: root/drivers/ssb/driver_pcicore.c
blob: 82feb348c8bbf3762195aaf2cf07668792f72721 (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
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
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
/*
 * Sonics Silicon Backplane
 * Broadcom PCI-core driver
 *
 * Copyright 2005, Broadcom Corporation
 * Copyright 2006, 2007, Michael Buesch <mb@bu3sch.de>
 *
 * Licensed under the GNU/GPL. See COPYING for details.
 */

#include <linux/ssb/ssb.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/ssb/ssb_embedded.h>

#include "ssb_private.h"

static u32 ssb_pcie_read(struct ssb_pcicore *pc, u32 address);
static void ssb_pcie_write(struct ssb_pcicore *pc, u32 address, u32 data);
static u16 ssb_pcie_mdio_read(struct ssb_pcicore *pc, u8 device, u8 address);
static void ssb_pcie_mdio_write(struct ssb_pcicore *pc, u8 device,
				u8 address, u16 data);

static inline
u32 pcicore_read32(struct ssb_pcicore *pc, u16 offset)
{
	return ssb_read32(pc->dev, offset);
}

static inline
void pcicore_write32(struct ssb_pcicore *pc, u16 offset, u32 value)
{
	ssb_write32(pc->dev, offset, value);
}

static inline
u16 pcicore_read16(struct ssb_pcicore *pc, u16 offset)
{
	return ssb_read16(pc->dev, offset);
}

static inline
void pcicore_write16(struct ssb_pcicore *pc, u16 offset, u16 value)
{
	ssb_write16(pc->dev, offset, value);
}

/**************************************************
 * Code for hostmode operation.
 **************************************************/

#ifdef CONFIG_SSB_PCICORE_HOSTMODE

#include <asm/paccess.h>
/* Probe a 32bit value on the bus and catch bus exceptions.
 * Returns nonzero on a bus exception.
 * This is MIPS specific */
#define mips_busprobe32(val, addr)	get_dbe((val), ((u32 *)(addr)))

/* Assume one-hot slot wiring */
#define SSB_PCI_SLOT_MAX	16

/* Global lock is OK, as we won't have more than one extpci anyway. */
static DEFINE_SPINLOCK(cfgspace_lock);
/* Core to access the external PCI config space. Can only have one. */
static struct ssb_pcicore *extpci_core;


static u32 get_cfgspace_addr(struct ssb_pcicore *pc,
			     unsigned int bus, unsigned int dev,
			     unsigned int func, unsigned int off)
{
	u32 addr = 0;
	u32 tmp;

	/* We do only have one cardbus device behind the bridge. */
	if (pc->cardbusmode && (dev >= 1))
		goto out;

	if (bus == 0) {
		/* Type 0 transaction */
		if (unlikely(dev >= SSB_PCI_SLOT_MAX))
			goto out;
		/* Slide the window */
		tmp = SSB_PCICORE_SBTOPCI_CFG0;
		tmp |= ((1 << (dev + 16)) & SSB_PCICORE_SBTOPCI1_MASK);
		pcicore_write32(pc, SSB_PCICORE_SBTOPCI1, tmp);
		/* Calculate the address */
		addr = SSB_PCI_CFG;
		addr |= ((1 << (dev + 16)) & ~SSB_PCICORE_SBTOPCI1_MASK);
		addr |= (func << 8);
		addr |= (off & ~3);
	} else {
		/* Type 1 transaction */
		pcicore_write32(pc, SSB_PCICORE_SBTOPCI1,
				SSB_PCICORE_SBTOPCI_CFG1);
		/* Calculate the address */
		addr = SSB_PCI_CFG;
		addr |= (bus << 16);
		addr |= (dev << 11);
		addr |= (func << 8);
		addr |= (off & ~3);
	}
out:
	return addr;
}

static int ssb_extpci_read_config(struct ssb_pcicore *pc,
				  unsigned int bus, unsigned int dev,
				  unsigned int func, unsigned int off,
				  void *buf, int len)
{
	int err = -EINVAL;
	u32 addr, val;
	void __iomem *mmio;

	SSB_WARN_ON(!pc->hostmode);
	if (unlikely(len != 1 && len != 2 && len != 4))
		goto out;
	addr = get_cfgspace_addr(pc, bus, dev, func, off);
	if (unlikely(!addr))
		goto out;
	err = -ENOMEM;
	mmio = ioremap_nocache(addr, len);
	if (!mmio)
		goto out;

	if (mips_busprobe32(val, mmio)) {
		val = 0xffffffff;
		goto unmap;
	}

	val = readl(mmio);
	val >>= (8 * (off & 3));

	switch (len) {
	case 1:
		*((u8 *)buf) = (u8)val;
		break;
	case 2:
		*((u16 *)buf) = (u16)val;
		break;
	case 4:
		*((u32 *)buf) = (u32)val;
		break;
	}
	err = 0;
unmap:
	iounmap(mmio);
out:
	return err;
}

static int ssb_extpci_write_config(struct ssb_pcicore *pc,
				   unsigned int bus, unsigned int dev,
				   unsigned int func, unsigned int off,
				   const void *buf, int len)
{
	int err = -EINVAL;
	u32 addr, val = 0;
	void __iomem *mmio;

	SSB_WARN_ON(!pc->hostmode);
	if (unlikely(len != 1 && len != 2 && len != 4))
		goto out;
	addr = get_cfgspace_addr(pc, bus, dev, func, off);
	if (unlikely(!addr))
		goto out;
	err = -ENOMEM;
	mmio = ioremap_nocache(addr, len);
	if (!mmio)
		goto out;

	if (mips_busprobe32(val, mmio)) {
		val = 0xffffffff;
		goto unmap;
	}

	switch (len) {
	case 1:
		val = readl(mmio);
		val &= ~(0xFF << (8 * (off & 3)));
		val |= *((const u8 *)buf) << (8 * (off & 3));
		break;
	case 2:
		val = readl(mmio);
		val &= ~(0xFFFF << (8 * (off & 3)));
		val |= *((const u16 *)buf) << (8 * (off & 3));
		break;
	case 4:
		val = *((const u32 *)buf);
		break;
	}
	writel(val, mmio);

	err = 0;
unmap:
	iounmap(mmio);
out:
	return err;
}

static int ssb_pcicore_read_config(struct pci_bus *bus, unsigned int devfn,
				   int reg, int size, u32 *val)
{
	unsigned long flags;
	int err;

	spin_lock_irqsave(&cfgspace_lock, flags);
	err = ssb_extpci_read_config(extpci_core, bus->number, PCI_SLOT(devfn),
				     PCI_FUNC(devfn), reg, val, size);
	spin_unlock_irqrestore(&cfgspace_lock, flags);

	return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
}

static int ssb_pcicore_write_config(struct pci_bus *bus, unsigned int devfn,
				    int reg, int size, u32 val)
{
	unsigned long flags;
	int err;

	spin_lock_irqsave(&cfgspace_lock, flags);
	err = ssb_extpci_write_config(extpci_core, bus->number, PCI_SLOT(devfn),
				      PCI_FUNC(devfn), reg, &val, size);
	spin_unlock_irqrestore(&cfgspace_lock, flags);

	return err ? PCIBIOS_DEVICE_NOT_FOUND : PCIBIOS_SUCCESSFUL;
}

static struct pci_ops ssb_pcicore_pciops = {
	.read	= ssb_pcicore_read_config,
	.write	= ssb_pcicore_write_config,
};

static struct resource ssb_pcicore_mem_resource = {
	.name	= "SSB PCIcore external memory",
	.start	= SSB_PCI_DMA,
	.end	= SSB_PCI_DMA + SSB_PCI_DMA_SZ - 1,
	.flags	= IORESOURCE_MEM | IORESOURCE_PCI_FIXED,
};

static struct resource ssb_pcicore_io_resource = {
	.name	= "SSB PCIcore external I/O",
	.start	= 0x100,
	.end	= 0x7FF,
	.flags	= IORESOURCE_IO | IORESOURCE_PCI_FIXED,
};

static struct pci_controller ssb_pcicore_controller = {
	.pci_ops	= &ssb_pcicore_pciops,
	.io_resource	= &ssb_pcicore_io_resource,
	.mem_resource	= &ssb_pcicore_mem_resource,
};

/* This function is called when doing a pci_enable_device().
 * We must first check if the device is a device on the PCI-core bridge. */
int ssb_pcicore_plat_dev_init(struct pci_dev *d)
{
	if (d->bus->ops != &ssb_pcicore_pciops) {
		/* This is not a device on the PCI-core bridge. */
		return -ENODEV;
	}

	ssb_printk(KERN_INFO "PCI: Fixing up device %s\n",
		   pci_name(d));

	/* Fix up interrupt lines */
	d->irq = ssb_mips_irq(extpci_core->dev) + 2;
	pci_write_config_byte(d, PCI_INTERRUPT_LINE, d->irq);

	return 0;
}

/* Early PCI fixup for a device on the PCI-core bridge. */
static void ssb_pcicore_fixup_pcibridge(struct pci_dev *dev)
{
	u8 lat;

	if (dev->bus->ops != &ssb_pcicore_pciops) {
		/* This is not a device on the PCI-core bridge. */
		return;
	}
	if (dev->bus->number != 0 || PCI_SLOT(dev->devfn) != 0)
		return;

	ssb_printk(KERN_INFO "PCI: Fixing up bridge %s\n", pci_name(dev));

	/* Enable PCI bridge bus mastering and memory space */
	pci_set_master(dev);
	if (pcibios_enable_device(dev, ~0) < 0) {
		ssb_printk(KERN_ERR "PCI: SSB bridge enable failed\n");
		return;
	}

	/* Enable PCI bridge BAR1 prefetch and burst */
	pci_write_config_dword(dev, SSB_BAR1_CONTROL, 3);

	/* Make sure our latency is high enough to handle the devices behind us */
	lat = 168;
	ssb_printk(KERN_INFO "PCI: Fixing latency timer of device %s to %u\n",
		   pci_name(dev), lat);
	pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
}
DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, ssb_pcicore_fixup_pcibridge);

/* PCI device IRQ mapping. */
int ssb_pcicore_pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
{
	if (dev->bus->ops != &ssb_pcicore_pciops) {
		/* This is not a device on the PCI-core bridge. */
		return -ENODEV;
	}
	return ssb_mips_irq(extpci_core->dev) + 2;
}

static void ssb_pcicore_init_hostmode(struct ssb_pcicore *pc)
{
	u32 val;

	if (WARN_ON(extpci_core))
		return;
	extpci_core = pc;

	ssb_dprintk(KERN_INFO PFX "PCIcore in host mode found\n");
	/* Reset devices on the external PCI bus */
	val = SSB_PCICORE_CTL_RST_OE;
	val |= SSB_PCICORE_CTL_CLK_OE;
	pcicore_write32(pc, SSB_PCICORE_CTL, val);
	val |= SSB_PCICORE_CTL_CLK; /* Clock on */
	pcicore_write32(pc, SSB_PCICORE_CTL, val);
	udelay(150); /* Assertion time demanded by the PCI standard */
	val |= SSB_PCICORE_CTL_RST; /* Deassert RST# */
	pcicore_write32(pc, SSB_PCICORE_CTL, val);
	val = SSB_PCICORE_ARBCTL_INTERN;
	pcicore_write32(pc, SSB_PCICORE_ARBCTL, val);
	udelay(1); /* Assertion time demanded by the PCI standard */

	if (pc->dev->bus->has_cardbus_slot) {
		ssb_dprintk(KERN_INFO PFX "CardBus slot detected\n");
		pc->cardbusmode = 1;
		/* GPIO 1 resets the bridge */
		ssb_gpio_out(pc->dev->bus, 1, 1);
		ssb_gpio_outen(pc->dev->bus, 1, 1);
		pcicore_write16(pc, SSB_PCICORE_SPROM(0),
				pcicore_read16(pc, SSB_PCICORE_SPROM(0))
				| 0x0400);
	}

	/* 64MB I/O window */
	pcicore_write32(pc, SSB_PCICORE_SBTOPCI0,
			SSB_PCICORE_SBTOPCI_IO);
	/* 64MB config space */
	pcicore_write32(pc, SSB_PCICORE_SBTOPCI1,
			SSB_PCICORE_SBTOPCI_CFG0);
	/* 1GB memory window */
	pcicore_write32(pc, SSB_PCICORE_SBTOPCI2,
			SSB_PCICORE_SBTOPCI_MEM | SSB_PCI_DMA);

	/* Enable PCI bridge BAR0 prefetch and burst */
	val = PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY;
	ssb_extpci_write_config(pc, 0, 0, 0, PCI_COMMAND, &val, 2);
	/* Clear error conditions */
	val = 0;
	ssb_extpci_write_config(pc, 0, 0, 0, PCI_STATUS, &val, 2);

	/* Enable PCI interrupts */
	pcicore_write32(pc, SSB_PCICORE_IMASK,
			SSB_PCICORE_IMASK_INTA);

	/* Ok, ready to run, register it to the system.
	 * The following needs change, if we want to port hostmode
	 * to non-MIPS platform. */
	ssb_pcicore_controller.io_map_base = (unsigned long)ioremap_nocache(SSB_PCI_MEM, 0x04000000);
	set_io_port_base(ssb_pcicore_controller.io_map_base);
	/* Give some time to the PCI controller to configure itself with the new
	 * values. Not waiting at this point causes crashes of the machine. */
	mdelay(10);
	register_pci_controller(&ssb_pcicore_controller);
}

static int pcicore_is_in_hostmode(struct ssb_pcicore *pc)
{
	struct ssb_bus *bus = pc->dev->bus;
	u16 chipid_top;
	u32 tmp;

	chipid_top = (bus->chip_id & 0xFF00);
	if (chipid_top != 0x4700 &&
	    chipid_top != 0x5300)
		return 0;

	if (bus->sprom.boardflags_lo & SSB_PCICORE_BFL_NOPCI)
		return 0;

	/* The 200-pin BCM4712 package does not bond out PCI. Even when
	 * PCI is bonded out, some boards may leave the pins floating. */
	if (bus->chip_id == 0x4712) {
		if (bus->chip_package == SSB_CHIPPACK_BCM4712S)
			return 0;
		if (bus->chip_package == SSB_CHIPPACK_BCM4712M)
			return 0;
	}
	if (bus->chip_id == 0x5350)
		return 0;

	return !mips_busprobe32(tmp, (bus->mmio + (pc->dev->core_index * SSB_CORE_SIZE)));
}
#endif /* CONFIG_SSB_PCICORE_HOSTMODE */

/**************************************************
 * Workarounds.
 **************************************************/

static void ssb_pcicore_fix_sprom_core_index(struct ssb_pcicore *pc)
{
	u16 tmp = pcicore_read16(pc, SSB_PCICORE_SPROM(0));
	if (((tmp & 0xF000) >> 12) != pc->dev->core_index) {
		tmp &= ~0xF000;
		tmp |= (pc->dev->core_index << 12);
		pcicore_write16(pc, SSB_PCICORE_SPROM(0), tmp);
	}
}

static u8 ssb_pcicore_polarity_workaround(struct ssb_pcicore *pc)
{
	return (ssb_pcie_read(pc, 0x204) & 0x10) ? 0xC0 : 0x80;
}

static void ssb_pcicore_serdes_workaround(struct ssb_pcicore *pc)
{
	const u8 serdes_pll_device = 0x1D;
	const u8 serdes_rx_device = 0x1F;
	u16 tmp;

	ssb_pcie_mdio_write(pc, serdes_rx_device, 1 /* Control */,
			    ssb_pcicore_polarity_workaround(pc));
	tmp = ssb_pcie_mdio_read(pc, serdes_pll_device, 1 /* Control */);
	if (tmp & 0x4000)
		ssb_pcie_mdio_write(pc, serdes_pll_device, 1, tmp & ~0x4000);
}

static void ssb_pcicore_pci_setup_workarounds(struct ssb_pcicore *pc)
{
	struct ssb_device *pdev = pc->dev;
	struct ssb_bus *bus = pdev->bus;
	u32 tmp;

	tmp = pcicore_read32(pc, SSB_PCICORE_SBTOPCI2);
	tmp |= SSB_PCICORE_SBTOPCI_PREF;
	tmp |= SSB_PCICORE_SBTOPCI_BURST;
	pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, tmp);

	if (pdev->id.revision < 5) {
		tmp = ssb_read32(pdev, SSB_IMCFGLO);
		tmp &= ~SSB_IMCFGLO_SERTO;
		tmp |= 2;
		tmp &= ~SSB_IMCFGLO_REQTO;
		tmp |= 3 << SSB_IMCFGLO_REQTO_SHIFT;
		ssb_write32(pdev, SSB_IMCFGLO, tmp);
		ssb_commit_settings(bus);
	} else if (pdev->id.revision >= 11) {
		tmp = pcicore_read32(pc, SSB_PCICORE_SBTOPCI2);
		tmp |= SSB_PCICORE_SBTOPCI_MRM;
		pcicore_write32(pc, SSB_PCICORE_SBTOPCI2, tmp);
	}
}

static void ssb_pcicore_pcie_setup_workarounds(struct ssb_pcicore *pc)
{
	u32 tmp;
	u8 rev = pc->dev->id.revision;

	if (rev == 0 || rev == 1) {
		/* TLP Workaround register. */
		tmp = ssb_pcie_read(pc, 0x4);
		tmp |= 0x8;
		ssb_pcie_write(pc, 0x4, tmp);
	}
	if (rev == 1) {
		/* DLLP Link Control register. */
		tmp = ssb_pcie_read(pc, 0x100);
		tmp |= 0x40;
		ssb_pcie_write(pc, 0x100, tmp);
	}

	if (rev == 0) {
		const u8 serdes_rx_device = 0x1F;

		ssb_pcie_mdio_write(pc, serdes_rx_device,
					2 /* Timer */, 0x8128);
		ssb_pcie_mdio_write(pc, serdes_rx_device,
					6 /* CDR */, 0x0100);
		ssb_pcie_mdio_write(pc, serdes_rx_device,
					7 /* CDR BW */, 0x1466);
	} else if (rev == 3 || rev == 4 || rev == 5) {
		/* TODO: DLLP Power Management Threshold */
		ssb_pcicore_serdes_workaround(pc);
		/* TODO: ASPM */
	} else if (rev == 7) {
		/* TODO: No PLL down */
	}

	if (rev >= 6) {
		/* Miscellaneous Configuration Fixup */
		tmp = pcicore_read16(pc, SSB_PCICORE_SPROM(5));
		if (!(tmp & 0x8000))
			pcicore_write16(pc, SSB_PCICORE_SPROM(5),
					tmp | 0x8000);
	}
}

/**************************************************
 * Generic and Clientmode operation code.
 **************************************************/

static void ssb_pcicore_init_clientmode(struct ssb_pcicore *pc)
{
	/* Disable PCI interrupts. */
	ssb_write32(pc->dev, SSB_INTVEC, 0);
}

void ssb_pcicore_init(struct ssb_pcicore *pc)
{
	struct ssb_device *dev = pc->dev;

	if (!dev)
		return;
	if (!ssb_device_is_enabled(dev))
		ssb_device_enable(dev, 0);

	ssb_pcicore_fix_sprom_core_index(pc);

#ifdef CONFIG_SSB_PCICORE_HOSTMODE
	pc->hostmode = pcicore_is_in_hostmode(pc);
	if (pc->hostmode)
		ssb_pcicore_init_hostmode(pc);
#endif /* CONFIG_SSB_PCICORE_HOSTMODE */
	if (!pc->hostmode)
		ssb_pcicore_init_clientmode(pc);

	/* Additional always once-executed workarounds */
	ssb_pcicore_serdes_workaround(pc);
	/* TODO: ASPM */
	/* TODO: Clock Request Update */
}

static u32 ssb_pcie_read(struct ssb_pcicore *pc, u32 address)
{
	pcicore_write32(pc, 0x130, address);
	return pcicore_read32(pc, 0x134);
}

static void ssb_pcie_write(struct ssb_pcicore *pc, u32 address, u32 data)
{
	pcicore_write32(pc, 0x130, address);
	pcicore_write32(pc, 0x134, data);
}

static void ssb_pcie_mdio_set_phy(struct ssb_pcicore *pc, u8 phy)
{
	const u16 mdio_control = 0x128;
	const u16 mdio_data = 0x12C;
	u32 v;
	int i;

	v = (1 << 30); /* Start of Transaction */
	v |= (1 << 28); /* Write Transaction */
	v |= (1 << 17); /* Turnaround */
	v |= (0x1F << 18);
	v |= (phy << 4);
	pcicore_write32(pc, mdio_data, v);

	udelay(10);
	for (i = 0; i < 200; i++) {
		v = pcicore_read32(pc, mdio_control);
		if (v & 0x100 /* Trans complete */)
			break;
		msleep(1);
	}
}

static u16 ssb_pcie_mdio_read(struct ssb_pcicore *pc, u8 device, u8 address)
{
	const u16 mdio_control = 0x128;
	const u16 mdio_data = 0x12C;
	int max_retries = 10;
	u16 ret = 0;
	u32 v;
	int i;

	v = 0x80; /* Enable Preamble Sequence */
	v |= 0x2; /* MDIO Clock Divisor */
	pcicore_write32(pc, mdio_control, v);

	if (pc->dev->id.revision >= 10) {
		max_retries = 200;
		ssb_pcie_mdio_set_phy(pc, device);
	}

	v = (1 << 30); /* Start of Transaction */
	v |= (1 << 29); /* Read Transaction */
	v |= (1 << 17); /* Turnaround */
	if (pc->dev->id.revision < 10)
		v |= (u32)device << 22;
	v |= (u32)address << 18;
	pcicore_write32(pc, mdio_data, v);
	/* Wait for the device to complete the transaction */
	udelay(10);
	for (i = 0; i < max_retries; i++) {
		v = pcicore_read32(pc, mdio_control);
		if (v & 0x100 /* Trans complete */) {
			udelay(10);
			ret = pcicore_read32(pc, mdio_data);
			break;
		}
		msleep(1);
	}
	pcicore_write32(pc, mdio_control, 0);
	return ret;
}

static void ssb_pcie_mdio_write(struct ssb_pcicore *pc, u8 device,
				u8 address, u16 data)
{
	const u16 mdio_control = 0x128;
	const u16 mdio_data = 0x12C;
	int max_retries = 10;
	u32 v;
	int i;

	v = 0x80; /* Enable Preamble Sequence */
	v |= 0x2; /* MDIO Clock Divisor */
	pcicore_write32(pc, mdio_control, v);

	if (pc->dev->id.revision >= 10) {
		max_retries = 200;
		ssb_pcie_mdio_set_phy(pc, device);
	}

	v = (1 << 30); /* Start of Transaction */
	v |= (1 << 28); /* Write Transaction */
	v |= (1 << 17); /* Turnaround */
	if (pc->dev->id.revision < 10)
		v |= (u32)device << 22;
	v |= (u32)address << 18;
	v |= data;
	pcicore_write32(pc, mdio_data, v);
	/* Wait for the device to complete the transaction */
	udelay(10);
	for (i = 0; i < max_retries; i++) {
		v = pcicore_read32(pc, mdio_control);
		if (v & 0x100 /* Trans complete */)
			break;
		msleep(1);
	}
	pcicore_write32(pc, mdio_control, 0);
}

int ssb_pcicore_dev_irqvecs_enable(struct ssb_pcicore *pc,
				   struct ssb_device *dev)
{
	struct ssb_device *pdev = pc->dev;
	struct ssb_bus *bus;
	int err = 0;
	u32 tmp;

	if (dev->bus->bustype != SSB_BUSTYPE_PCI) {
		/* This SSB device is not on a PCI host-bus. So the IRQs are
		 * not routed through the PCI core.
		 * So we must not enable routing through the PCI core. */
		goto out;
	}

	if (!pdev)
		goto out;
	bus = pdev->bus;

	might_sleep_if(pdev->id.coreid != SSB_DEV_PCI);

	/* Enable interrupts for this device. */
	if ((pdev->id.revision >= 6) || (pdev->id.coreid == SSB_DEV_PCIE)) {
		u32 coremask;

		/* Calculate the "coremask" for the device. */
		coremask = (1 << dev->core_index);

		SSB_WARN_ON(bus->bustype != SSB_BUSTYPE_PCI);
		err = pci_read_config_dword(bus->host_pci, SSB_PCI_IRQMASK, &tmp);
		if (err)
			goto out;
		tmp |= coremask << 8;
		err = pci_write_config_dword(bus->host_pci, SSB_PCI_IRQMASK, tmp);
		if (err)
			goto out;
	} else {
		u32 intvec;

		intvec = ssb_read32(pdev, SSB_INTVEC);
		tmp = ssb_read32(dev, SSB_TPSFLAG);
		tmp &= SSB_TPSFLAG_BPFLAG;
		intvec |= (1 << tmp);
		ssb_write32(pdev, SSB_INTVEC, intvec);
	}

	/* Setup PCIcore operation. */
	if (pc->setup_done)
		goto out;
	if (pdev->id.coreid == SSB_DEV_PCI) {
		ssb_pcicore_pci_setup_workarounds(pc);
	} else {
		WARN_ON(pdev->id.coreid != SSB_DEV_PCIE);
		ssb_pcicore_pcie_setup_workarounds(pc);
	}
	pc->setup_done = 1;
out:
	return err;
}
EXPORT_SYMBOL(ssb_pcicore_dev_irqvecs_enable);