summaryrefslogtreecommitdiffstats
path: root/drivers/ide/setup-pci.c
blob: 2dc3835478eccf2ca142ce492114eedc6371a3e4 (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
/*
 *  Copyright (C) 1998-2000  Andre Hedrick <andre@linux-ide.org>
 *  Copyright (C) 1995-1998  Mark Lord
 *  Copyright (C)      2007  Bartlomiej Zolnierkiewicz
 *
 *  May be copied or modified under the terms of the GNU General Public License
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/ide.h>
#include <linux/dma-mapping.h>

#include <asm/io.h>
#include <asm/irq.h>


/**
 *	ide_match_hwif	-	match a PCI IDE against an ide_hwif
 *	@io_base: I/O base of device
 *	@bootable: set if its bootable
 *	@name: name of device
 *
 *	Match a PCI IDE port against an entry in ide_hwifs[],
 *	based on io_base port if possible. Return the matching hwif,
 *	or a new hwif. If we find an error (clashing, out of devices, etc)
 *	return NULL
 *
 *	FIXME: we need to handle mmio matches here too
 */

static ide_hwif_t *ide_match_hwif(unsigned long io_base, u8 bootable, const char *name)
{
	int h;
	ide_hwif_t *hwif;

	/*
	 * Look for a hwif with matching io_base default value.
	 * If chipset is "ide_unknown", then claim that hwif slot.
	 * Otherwise, some other chipset has already claimed it..  :(
	 */
	for (h = 0; h < MAX_HWIFS; ++h) {
		hwif = &ide_hwifs[h];
		if (hwif->io_ports[IDE_DATA_OFFSET] == io_base) {
			if (hwif->chipset == ide_unknown)
				return hwif; /* match */
			printk(KERN_ERR "%s: port 0x%04lx already claimed by %s\n",
				name, io_base, hwif->name);
			return NULL;	/* already claimed */
		}
	}
	/*
	 * Okay, there is no hwif matching our io_base,
	 * so we'll just claim an unassigned slot.
	 * Give preference to claiming other slots before claiming ide0/ide1,
	 * just in case there's another interface yet-to-be-scanned
	 * which uses ports 1f0/170 (the ide0/ide1 defaults).
	 *
	 * Unless there is a bootable card that does not use the standard
	 * ports 1f0/170 (the ide0/ide1 defaults). The (bootable) flag.
	 */
	if (bootable) {
		for (h = 0; h < MAX_HWIFS; ++h) {
			hwif = &ide_hwifs[h];
			if (hwif->chipset == ide_unknown)
				return hwif;	/* pick an unused entry */
		}
	} else {
		for (h = 2; h < MAX_HWIFS; ++h) {
			hwif = ide_hwifs + h;
			if (hwif->chipset == ide_unknown)
				return hwif;	/* pick an unused entry */
		}
	}
	for (h = 0; h < 2 && h < MAX_HWIFS; ++h) {
		hwif = ide_hwifs + h;
		if (hwif->chipset == ide_unknown)
			return hwif;	/* pick an unused entry */
	}
	printk(KERN_ERR "%s: too many IDE interfaces, no room in table\n", name);
	return NULL;
}

/**
 *	ide_setup_pci_baseregs	-	place a PCI IDE controller native
 *	@dev: PCI device of interface to switch native
 *	@name: Name of interface
 *
 *	We attempt to place the PCI interface into PCI native mode. If
 *	we succeed the BARs are ok and the controller is in PCI mode.
 *	Returns 0 on success or an errno code. 
 *
 *	FIXME: if we program the interface and then fail to set the BARS
 *	we don't switch it back to legacy mode. Do we actually care ??
 */
 
static int ide_setup_pci_baseregs (struct pci_dev *dev, const char *name)
{
	u8 progif = 0;

	/*
	 * Place both IDE interfaces into PCI "native" mode:
	 */
	if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) ||
			 (progif & 5) != 5) {
		if ((progif & 0xa) != 0xa) {
			printk(KERN_INFO "%s: device not capable of full "
				"native PCI mode\n", name);
			return -EOPNOTSUPP;
		}
		printk("%s: placing both ports into native PCI mode\n", name);
		(void) pci_write_config_byte(dev, PCI_CLASS_PROG, progif|5);
		if (pci_read_config_byte(dev, PCI_CLASS_PROG, &progif) ||
		    (progif & 5) != 5) {
			printk(KERN_ERR "%s: rewrite of PROGIF failed, wanted "
				"0x%04x, got 0x%04x\n",
				name, progif|5, progif);
			return -EOPNOTSUPP;
		}
	}
	return 0;
}

#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
static void ide_pci_clear_simplex(unsigned long dma_base, const char *name)
{
	u8 dma_stat = inb(dma_base + 2);

	outb(dma_stat & 0x60, dma_base + 2);
	dma_stat = inb(dma_base + 2);
	if (dma_stat & 0x80)
		printk(KERN_INFO "%s: simplex device: DMA forced\n", name);
}

/**
 *	ide_get_or_set_dma_base		-	setup BMIBA
 *	@d: IDE port info
 *	@hwif: IDE interface
 *
 *	Fetch the DMA Bus-Master-I/O-Base-Address (BMIBA) from PCI space.
 *	Where a device has a partner that is already in DMA mode we check
 *	and enforce IDE simplex rules.
 */

static unsigned long ide_get_or_set_dma_base(const struct ide_port_info *d, ide_hwif_t *hwif)
{
	struct pci_dev *dev = to_pci_dev(hwif->dev);
	unsigned long dma_base = 0;
	u8 dma_stat = 0;

	if (hwif->mmio)
		return hwif->dma_base;

	if (hwif->mate && hwif->mate->dma_base) {
		dma_base = hwif->mate->dma_base - (hwif->channel ? 0 : 8);
	} else {
		u8 baridx = (d->host_flags & IDE_HFLAG_CS5520) ? 2 : 4;

		dma_base = pci_resource_start(dev, baridx);

		if (dma_base == 0) {
			printk(KERN_ERR "%s: DMA base is invalid\n", d->name);
			return 0;
		}
	}

	if (hwif->channel)
		dma_base += 8;

	if (d->host_flags & IDE_HFLAG_CS5520)
		goto out;

	if (d->host_flags & IDE_HFLAG_CLEAR_SIMPLEX) {
		ide_pci_clear_simplex(dma_base, d->name);
		goto out;
	}

	/*
	 * If the device claims "simplex" DMA, this means that only one of
	 * the two interfaces can be trusted with DMA at any point in time
	 * (so we should enable DMA only on one of the two interfaces).
	 *
	 * FIXME: At this point we haven't probed the drives so we can't make
	 * the appropriate decision.  Really we should defer this problem until
	 * we tune the drive then try to grab DMA ownership if we want to be
	 * the DMA end.  This has to be become dynamic to handle hot-plug.
	 */
	dma_stat = hwif->INB(dma_base + 2);
	if ((dma_stat & 0x80) && hwif->mate && hwif->mate->dma_base) {
		printk(KERN_INFO "%s: simplex device: DMA disabled\n", d->name);
		dma_base = 0;
	}
out:
	return dma_base;
}
#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */

void ide_setup_pci_noise(struct pci_dev *dev, const struct ide_port_info *d)
{
	printk(KERN_INFO "%s: IDE controller (0x%04x:0x%04x rev 0x%02x) at "
			 " PCI slot %s\n", d->name, dev->vendor, dev->device,
			 dev->revision, pci_name(dev));
}

EXPORT_SYMBOL_GPL(ide_setup_pci_noise);


/**
 *	ide_pci_enable	-	do PCI enables
 *	@dev: PCI device
 *	@d: IDE port info
 *
 *	Enable the IDE PCI device. We attempt to enable the device in full
 *	but if that fails then we only need IO space. The PCI code should
 *	have setup the proper resources for us already for controllers in
 *	legacy mode.
 *	
 *	Returns zero on success or an error code
 */

static int ide_pci_enable(struct pci_dev *dev, const struct ide_port_info *d)
{
	int ret;

	if (pci_enable_device(dev)) {
		ret = pci_enable_device_io(dev);
		if (ret < 0) {
			printk(KERN_WARNING "%s: (ide_setup_pci_device:) "
				"Could not enable device.\n", d->name);
			goto out;
		}
		printk(KERN_WARNING "%s: BIOS configuration fixed.\n", d->name);
	}

	/*
	 * assume all devices can do 32-bit DMA for now, we can add
	 * a DMA mask field to the struct ide_port_info if we need it
	 * (or let lower level driver set the DMA mask)
	 */
	ret = pci_set_dma_mask(dev, DMA_32BIT_MASK);
	if (ret < 0) {
		printk(KERN_ERR "%s: can't set dma mask\n", d->name);
		goto out;
	}

	/* FIXME: Temporary - until we put in the hotplug interface logic
	   Check that the bits we want are not in use by someone else. */
	ret = pci_request_region(dev, 4, "ide_tmp");
	if (ret < 0)
		goto out;

	pci_release_region(dev, 4);
out:
	return ret;
}

/**
 *	ide_pci_configure	-	configure an unconfigured device
 *	@dev: PCI device
 *	@d: IDE port info
 *
 *	Enable and configure the PCI device we have been passed.
 *	Returns zero on success or an error code.
 */

static int ide_pci_configure(struct pci_dev *dev, const struct ide_port_info *d)
{
	u16 pcicmd = 0;
	/*
	 * PnP BIOS was *supposed* to have setup this device, but we
	 * can do it ourselves, so long as the BIOS has assigned an IRQ
	 * (or possibly the device is using a "legacy header" for IRQs).
	 * Maybe the user deliberately *disabled* the device,
	 * but we'll eventually ignore it again if no drives respond.
	 */
	if (ide_setup_pci_baseregs(dev, d->name) || pci_write_config_word(dev, PCI_COMMAND, pcicmd|PCI_COMMAND_IO)) 
	{
		printk(KERN_INFO "%s: device disabled (BIOS)\n", d->name);
		return -ENODEV;
	}
	if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd)) {
		printk(KERN_ERR "%s: error accessing PCI regs\n", d->name);
		return -EIO;
	}
	if (!(pcicmd & PCI_COMMAND_IO)) {
		printk(KERN_ERR "%s: unable to enable IDE controller\n", d->name);
		return -ENXIO;
	}
	return 0;
}

/**
 *	ide_pci_check_iomem	-	check a register is I/O
 *	@dev: PCI device
 *	@d: IDE port info
 *	@bar: BAR number
 *
 *	Checks if a BAR is configured and points to MMIO space. If so,
 *	return an error code. Otherwise return 0
 */

static int ide_pci_check_iomem(struct pci_dev *dev, const struct ide_port_info *d,
			       int bar)
{
	ulong flags = pci_resource_flags(dev, bar);
	
	/* Unconfigured ? */
	if (!flags || pci_resource_len(dev, bar) == 0)
		return 0;

	/* I/O space */
	if (flags & IORESOURCE_IO)
		return 0;
		
	/* Bad */
	return -EINVAL;
}

/**
 *	ide_hwif_configure	-	configure an IDE interface
 *	@dev: PCI device holding interface
 *	@d: IDE port info
 *	@port: port number
 *	@irq: PCI IRQ
 *
 *	Perform the initial set up for the hardware interface structure. This
 *	is done per interface port rather than per PCI device. There may be
 *	more than one port per device.
 *
 *	Returns the new hardware interface structure, or NULL on a failure
 */

static ide_hwif_t *ide_hwif_configure(struct pci_dev *dev,
				      const struct ide_port_info *d,
				      unsigned int port, int irq)
{
	unsigned long ctl = 0, base = 0;
	ide_hwif_t *hwif;
	u8 bootable = (d->host_flags & IDE_HFLAG_BOOTABLE) ? 1 : 0;
	struct hw_regs_s hw;

	if ((d->host_flags & IDE_HFLAG_ISA_PORTS) == 0) {
		if (ide_pci_check_iomem(dev, d, 2 * port) ||
		    ide_pci_check_iomem(dev, d, 2 * port + 1)) {
			printk(KERN_ERR "%s: I/O baseregs (BIOS) are reported "
					"as MEM for port %d!\n", d->name, port);
			return NULL;
		}
 
		ctl  = pci_resource_start(dev, 2*port+1);
		base = pci_resource_start(dev, 2*port);
		if ((ctl && !base) || (base && !ctl)) {
			printk(KERN_ERR "%s: inconsistent baseregs (BIOS) "
				"for port %d, skipping\n", d->name, port);
			return NULL;
		}
	}
	if (!ctl)
	{
		/* Use default values */
		ctl = port ? 0x374 : 0x3f4;
		base = port ? 0x170 : 0x1f0;
	}
	if ((hwif = ide_match_hwif(base, bootable, d->name)) == NULL)
		return NULL;	/* no room in ide_hwifs[] */

	memset(&hw, 0, sizeof(hw));
	hw.irq = irq;
	hw.dev = &dev->dev;
	hw.chipset = d->chipset ? d->chipset : ide_pci;
	ide_std_init_ports(&hw, base, ctl | 2);

	ide_init_port_hw(hwif, &hw);

	hwif->dev = &dev->dev;
	hwif->cds = d;

	return hwif;
}

#ifdef CONFIG_BLK_DEV_IDEDMA_PCI
/**
 *	ide_hwif_setup_dma	-	configure DMA interface
 *	@hwif: IDE interface
 *	@d: IDE port info
 *
 *	Set up the DMA base for the interface. Enable the master bits as
 *	necessary and attempt to bring the device DMA into a ready to use
 *	state
 */

void ide_hwif_setup_dma(ide_hwif_t *hwif, const struct ide_port_info *d)
{
	struct pci_dev *dev = to_pci_dev(hwif->dev);
	u16 pcicmd;

	pci_read_config_word(dev, PCI_COMMAND, &pcicmd);

	if ((d->host_flags & IDE_HFLAG_NO_AUTODMA) == 0 ||
	    ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE &&
	     (dev->class & 0x80))) {
		unsigned long dma_base = ide_get_or_set_dma_base(d, hwif);
		if (dma_base && !(pcicmd & PCI_COMMAND_MASTER)) {
			/*
 			 * Set up BM-DMA capability
			 * (PnP BIOS should have done this)
 			 */
			pci_set_master(dev);
			if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd) || !(pcicmd & PCI_COMMAND_MASTER)) {
				printk(KERN_ERR "%s: %s error updating PCICMD\n",
					hwif->name, d->name);
				dma_base = 0;
			}
		}
		if (dma_base) {
			if (d->init_dma) {
				d->init_dma(hwif, dma_base);
			} else {
				ide_setup_dma(hwif, dma_base);
			}
		} else {
			printk(KERN_INFO "%s: %s Bus-Master DMA disabled "
				"(BIOS)\n", hwif->name, d->name);
		}
	}
}
#endif /* CONFIG_BLK_DEV_IDEDMA_PCI */

/**
 *	ide_setup_pci_controller	-	set up IDE PCI
 *	@dev: PCI device
 *	@d: IDE port info
 *	@noisy: verbose flag
 *	@config: returned as 1 if we configured the hardware
 *
 *	Set up the PCI and controller side of the IDE interface. This brings
 *	up the PCI side of the device, checks that the device is enabled
 *	and enables it if need be
 */

static int ide_setup_pci_controller(struct pci_dev *dev, const struct ide_port_info *d, int noisy, int *config)
{
	int ret;
	u16 pcicmd;

	if (noisy)
		ide_setup_pci_noise(dev, d);

	ret = ide_pci_enable(dev, d);
	if (ret < 0)
		goto out;

	ret = pci_read_config_word(dev, PCI_COMMAND, &pcicmd);
	if (ret < 0) {
		printk(KERN_ERR "%s: error accessing PCI regs\n", d->name);
		goto out;
	}
	if (!(pcicmd & PCI_COMMAND_IO)) {	/* is device disabled? */
		ret = ide_pci_configure(dev, d);
		if (ret < 0)
			goto out;
		*config = 1;
		printk(KERN_INFO "%s: device enabled (Linux)\n", d->name);
	}

out:
	return ret;
}

/**
 *	ide_pci_setup_ports	-	configure ports/devices on PCI IDE
 *	@dev: PCI device
 *	@d: IDE port info
 *	@pciirq: IRQ line
 *	@idx: ATA index table to update
 *
 *	Scan the interfaces attached to this device and do any
 *	necessary per port setup. Attach the devices and ask the
 *	generic DMA layer to do its work for us.
 *
 *	Normally called automaticall from do_ide_pci_setup_device,
 *	but is also used directly as a helper function by some controllers
 *	where the chipset setup is not the default PCI IDE one.
 */

void ide_pci_setup_ports(struct pci_dev *dev, const struct ide_port_info *d, int pciirq, u8 *idx)
{
	int channels = (d->host_flags & IDE_HFLAG_SINGLE) ? 1 : 2, port;
	ide_hwif_t *hwif;
	u8 tmp;

	/*
	 * Set up the IDE ports
	 */

	for (port = 0; port < channels; ++port) {
		const ide_pci_enablebit_t *e = &(d->enablebits[port]);

		if (e->reg && (pci_read_config_byte(dev, e->reg, &tmp) ||
		    (tmp & e->mask) != e->val)) {
			printk(KERN_INFO "%s: IDE port disabled\n", d->name);
			continue;	/* port not enabled */
		}

		hwif = ide_hwif_configure(dev, d, port, pciirq);
		if (hwif == NULL)
			continue;

		*(idx + port) = hwif->index;
	}
}

EXPORT_SYMBOL_GPL(ide_pci_setup_ports);

/*
 * ide_setup_pci_device() looks at the primary/secondary interfaces
 * on a PCI IDE device and, if they are enabled, prepares the IDE driver
 * for use with them.  This generic code works for most PCI chipsets.
 *
 * One thing that is not standardized is the location of the
 * primary/secondary interface "enable/disable" bits.  For chipsets that
 * we "know" about, this information is in the struct ide_port_info;
 * for all other chipsets, we just assume both interfaces are enabled.
 */
static int do_ide_setup_pci_device(struct pci_dev *dev,
				   const struct ide_port_info *d,
				   u8 *idx, u8 noisy)
{
	int tried_config = 0;
	int pciirq, ret;

	ret = ide_setup_pci_controller(dev, d, noisy, &tried_config);
	if (ret < 0)
		goto out;

	/*
	 * Can we trust the reported IRQ?
	 */
	pciirq = dev->irq;

	/* Is it an "IDE storage" device in non-PCI mode? */
	if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE && (dev->class & 5) != 5) {
		if (noisy)
			printk(KERN_INFO "%s: not 100%% native mode: "
				"will probe irqs later\n", d->name);
		/*
		 * This allows offboard ide-pci cards the enable a BIOS,
		 * verify interrupt settings of split-mirror pci-config
		 * space, place chipset into init-mode, and/or preserve
		 * an interrupt if the card is not native ide support.
		 */
		ret = d->init_chipset ? d->init_chipset(dev, d->name) : 0;
		if (ret < 0)
			goto out;
		pciirq = ret;
	} else if (tried_config) {
		if (noisy)
			printk(KERN_INFO "%s: will probe irqs later\n", d->name);
		pciirq = 0;
	} else if (!pciirq) {
		if (noisy)
			printk(KERN_WARNING "%s: bad irq (%d): will probe later\n",
				d->name, pciirq);
		pciirq = 0;
	} else {
		if (d->init_chipset) {
			ret = d->init_chipset(dev, d->name);
			if (ret < 0)
				goto out;
		}
		if (noisy)
			printk(KERN_INFO "%s: 100%% native mode on irq %d\n",
				d->name, pciirq);
	}

	/* FIXME: silent failure can happen */

	ide_pci_setup_ports(dev, d, pciirq, idx);
out:
	return ret;
}

int ide_setup_pci_device(struct pci_dev *dev, const struct ide_port_info *d)
{
	u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };
	int ret;

	ret = do_ide_setup_pci_device(dev, d, &idx[0], 1);

	if (ret >= 0)
		ide_device_add(idx, d);

	return ret;
}

EXPORT_SYMBOL_GPL(ide_setup_pci_device);

int ide_setup_pci_devices(struct pci_dev *dev1, struct pci_dev *dev2,
			  const struct ide_port_info *d)
{
	struct pci_dev *pdev[] = { dev1, dev2 };
	int ret, i;
	u8 idx[4] = { 0xff, 0xff, 0xff, 0xff };

	for (i = 0; i < 2; i++) {
		ret = do_ide_setup_pci_device(pdev[i], d, &idx[i*2], !i);
		/*
		 * FIXME: Mom, mom, they stole me the helper function to undo
		 * do_ide_setup_pci_device() on the first device!
		 */
		if (ret < 0)
			goto out;
	}

	ide_device_add(idx, d);
out:
	return ret;
}

EXPORT_SYMBOL_GPL(ide_setup_pci_devices);
OpenPOWER on IntegriCloud