aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/ata/sata_via.c
blob: 5b72e734300a19ff9bbc5554c46e80cc7f5edde7 (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
/*
 *  sata_via.c - VIA Serial ATA controllers
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 * 		   Please ALWAYS copy linux-ide@vger.kernel.org
 *		   on emails.
 *
 *  Copyright 2003-2004 Red Hat, Inc.  All rights reserved.
 *  Copyright 2003-2004 Jeff Garzik
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 *  libata documentation is available via 'make {ps|pdf}docs',
 *  as Documentation/DocBook/libata.*
 *
 *  Hardware documentation available under NDA.
 *
 *
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>

#define DRV_NAME	"sata_via"
#define DRV_VERSION	"2.3"

enum board_ids_enum {
	vt6420,
	vt6421,
};

enum {
	SATA_CHAN_ENAB		= 0x40, /* SATA channel enable */
	SATA_INT_GATE		= 0x41, /* SATA interrupt gating */
	SATA_NATIVE_MODE	= 0x42, /* Native mode enable */
	PATA_UDMA_TIMING	= 0xB3, /* PATA timing for DMA/ cable detect */
	PATA_PIO_TIMING		= 0xAB, /* PATA timing register */

	PORT0			= (1 << 1),
	PORT1			= (1 << 0),
	ALL_PORTS		= PORT0 | PORT1,

	NATIVE_MODE_ALL		= (1 << 7) | (1 << 6) | (1 << 5) | (1 << 4),

	SATA_EXT_PHY		= (1 << 6), /* 0==use PATA, 1==ext phy */
};

static int svia_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
static int svia_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
static int svia_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
static void svia_tf_load(struct ata_port *ap, const struct ata_taskfile *tf);
static void svia_noop_freeze(struct ata_port *ap);
static int vt6420_prereset(struct ata_link *link, unsigned long deadline);
static int vt6421_pata_cable_detect(struct ata_port *ap);
static void vt6421_set_pio_mode(struct ata_port *ap, struct ata_device *adev);
static void vt6421_set_dma_mode(struct ata_port *ap, struct ata_device *adev);

static const struct pci_device_id svia_pci_tbl[] = {
	{ PCI_VDEVICE(VIA, 0x5337), vt6420 },
	{ PCI_VDEVICE(VIA, 0x0591), vt6420 },
	{ PCI_VDEVICE(VIA, 0x3149), vt6420 },
	{ PCI_VDEVICE(VIA, 0x3249), vt6421 },
	{ PCI_VDEVICE(VIA, 0x5287), vt6420 },
	{ PCI_VDEVICE(VIA, 0x5372), vt6420 },
	{ PCI_VDEVICE(VIA, 0x7372), vt6420 },

	{ }	/* terminate list */
};

static struct pci_driver svia_pci_driver = {
	.name			= DRV_NAME,
	.id_table		= svia_pci_tbl,
	.probe			= svia_init_one,
#ifdef CONFIG_PM
	.suspend		= ata_pci_device_suspend,
	.resume			= ata_pci_device_resume,
#endif
	.remove			= ata_pci_remove_one,
};

static struct scsi_host_template svia_sht = {
	ATA_BMDMA_SHT(DRV_NAME),
};

static struct ata_port_operations svia_base_ops = {
	.inherits		= &ata_bmdma_port_ops,
	.sff_tf_load		= svia_tf_load,
};

static struct ata_port_operations vt6420_sata_ops = {
	.inherits		= &svia_base_ops,
	.freeze			= svia_noop_freeze,
	.prereset		= vt6420_prereset,
};

static struct ata_port_operations vt6421_pata_ops = {
	.inherits		= &svia_base_ops,
	.cable_detect		= vt6421_pata_cable_detect,
	.set_piomode		= vt6421_set_pio_mode,
	.set_dmamode		= vt6421_set_dma_mode,
};

static struct ata_port_operations vt6421_sata_ops = {
	.inherits		= &svia_base_ops,
	.scr_read		= svia_scr_read,
	.scr_write		= svia_scr_write,
};

static const struct ata_port_info vt6420_port_info = {
	.flags		= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY,
	.pio_mask	= 0x1f,
	.mwdma_mask	= 0x07,
	.udma_mask	= ATA_UDMA6,
	.port_ops	= &vt6420_sata_ops,
};

static struct ata_port_info vt6421_sport_info = {
	.flags		= ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY,
	.pio_mask	= 0x1f,
	.mwdma_mask	= 0x07,
	.udma_mask	= ATA_UDMA6,
	.port_ops	= &vt6421_sata_ops,
};

static struct ata_port_info vt6421_pport_info = {
	.flags		= ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_LEGACY,
	.pio_mask	= 0x1f,
	.mwdma_mask	= 0,
	.udma_mask	= ATA_UDMA6,
	.port_ops	= &vt6421_pata_ops,
};

MODULE_AUTHOR("Jeff Garzik");
MODULE_DESCRIPTION("SCSI low-level driver for VIA SATA controllers");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, svia_pci_tbl);
MODULE_VERSION(DRV_VERSION);

static int svia_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
{
	if (sc_reg > SCR_CONTROL)
		return -EINVAL;
	*val = ioread32(link->ap->ioaddr.scr_addr + (4 * sc_reg));
	return 0;
}

static int svia_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
{
	if (sc_reg > SCR_CONTROL)
		return -EINVAL;
	iowrite32(val, link->ap->ioaddr.scr_addr + (4 * sc_reg));
	return 0;
}

/**
 *	svia_tf_load - send taskfile registers to host controller
 *	@ap: Port to which output is sent
 *	@tf: ATA taskfile register set
 *
 *	Outputs ATA taskfile to standard ATA host controller.
 *
 *	This is to fix the internal bug of via chipsets, which will
 *	reset the device register after changing the IEN bit on ctl
 *	register.
 */
static void svia_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
{
	struct ata_taskfile ttf;

	if (tf->ctl != ap->last_ctl)  {
		ttf = *tf;
		ttf.flags |= ATA_TFLAG_DEVICE;
		tf = &ttf;
	}
	ata_sff_tf_load(ap, tf);
}

static void svia_noop_freeze(struct ata_port *ap)
{
	/* Some VIA controllers choke if ATA_NIEN is manipulated in
	 * certain way.  Leave it alone and just clear pending IRQ.
	 */
	ap->ops->sff_check_status(ap);
	ata_sff_irq_clear(ap);
}

/**
 *	vt6420_prereset - prereset for vt6420
 *	@link: target ATA link
 *	@deadline: deadline jiffies for the operation
 *
 *	SCR registers on vt6420 are pieces of shit and may hang the
 *	whole machine completely if accessed with the wrong timing.
 *	To avoid such catastrophe, vt6420 doesn't provide generic SCR
 *	access operations, but uses SStatus and SControl only during
 *	boot probing in controlled way.
 *
 *	As the old (pre EH update) probing code is proven to work, we
 *	strictly follow the access pattern.
 *
 *	LOCKING:
 *	Kernel thread context (may sleep)
 *
 *	RETURNS:
 *	0 on success, -errno otherwise.
 */
static int vt6420_prereset(struct ata_link *link, unsigned long deadline)
{
	struct ata_port *ap = link->ap;
	struct ata_eh_context *ehc = &ap->link.eh_context;
	unsigned long timeout = jiffies + (HZ * 5);
	u32 sstatus, scontrol;
	int online;

	/* don't do any SCR stuff if we're not loading */
	if (!(ap->pflags & ATA_PFLAG_LOADING))
		goto skip_scr;

	/* Resume phy.  This is the old SATA resume sequence */
	svia_scr_write(link, SCR_CONTROL, 0x300);
	svia_scr_read(link, SCR_CONTROL, &scontrol); /* flush */

	/* wait for phy to become ready, if necessary */
	do {
		msleep(200);
		svia_scr_read(link, SCR_STATUS, &sstatus);
		if ((sstatus & 0xf) != 1)
			break;
	} while (time_before(jiffies, timeout));

	/* open code sata_print_link_status() */
	svia_scr_read(link, SCR_STATUS, &sstatus);
	svia_scr_read(link, SCR_CONTROL, &scontrol);

	online = (sstatus & 0xf) == 0x3;

	ata_port_printk(ap, KERN_INFO,
			"SATA link %s 1.5 Gbps (SStatus %X SControl %X)\n",
			online ? "up" : "down", sstatus, scontrol);

	/* SStatus is read one more time */
	svia_scr_read(link, SCR_STATUS, &sstatus);

	if (!online) {
		/* tell EH to bail */
		ehc->i.action &= ~ATA_EH_RESET;
		return 0;
	}

 skip_scr:
	/* wait for !BSY */
	ata_sff_wait_ready(link, deadline);

	return 0;
}

static int vt6421_pata_cable_detect(struct ata_port *ap)
{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	u8 tmp;

	pci_read_config_byte(pdev, PATA_UDMA_TIMING, &tmp);
	if (tmp & 0x10)
		return ATA_CBL_PATA40;
	return ATA_CBL_PATA80;
}

static void vt6421_set_pio_mode(struct ata_port *ap, struct ata_device *adev)
{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	static const u8 pio_bits[] = { 0xA8, 0x65, 0x65, 0x31, 0x20 };
	pci_write_config_byte(pdev, PATA_PIO_TIMING, pio_bits[adev->pio_mode - XFER_PIO_0]);
}

static void vt6421_set_dma_mode(struct ata_port *ap, struct ata_device *adev)
{
	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
	static const u8 udma_bits[] = { 0xEE, 0xE8, 0xE6, 0xE4, 0xE2, 0xE1, 0xE0, 0xE0 };
	pci_write_config_byte(pdev, PATA_UDMA_TIMING, udma_bits[adev->dma_mode - XFER_UDMA_0]);
}

static const unsigned int svia_bar_sizes[] = {
	8, 4, 8, 4, 16, 256
};

static const unsigned int vt6421_bar_sizes[] = {
	16, 16, 16, 16, 32, 128
};

static void __iomem *svia_scr_addr(void __iomem *addr, unsigned int port)
{
	return addr + (port * 128);
}

static void __iomem *vt6421_scr_addr(void __iomem *addr, unsigned int port)
{
	return addr + (port * 64);
}

static void vt6421_init_addrs(struct ata_port *ap)
{
	void __iomem * const * iomap = ap->host->iomap;
	void __iomem *reg_addr = iomap[ap->port_no];
	void __iomem *bmdma_addr = iomap[4] + (ap->port_no * 8);
	struct ata_ioports *ioaddr = &ap->ioaddr;

	ioaddr->cmd_addr = reg_addr;
	ioaddr->altstatus_addr =
	ioaddr->ctl_addr = (void __iomem *)
		((unsigned long)(reg_addr + 8) | ATA_PCI_CTL_OFS);
	ioaddr->bmdma_addr = bmdma_addr;
	ioaddr->scr_addr = vt6421_scr_addr(iomap[5], ap->port_no);

	ata_sff_std_ports(ioaddr);

	ata_port_pbar_desc(ap, ap->port_no, -1, "port");
	ata_port_pbar_desc(ap, 4, ap->port_no * 8, "bmdma");
}

static int vt6420_prepare_host(struct pci_dev *pdev, struct ata_host **r_host)
{
	const struct ata_port_info *ppi[] = { &vt6420_port_info, NULL };
	struct ata_host *host;
	int rc;

	rc = ata_pci_sff_prepare_host(pdev, ppi, &host);
	if (rc)
		return rc;
	*r_host = host;

	rc = pcim_iomap_regions(pdev, 1 << 5, DRV_NAME);
	if (rc) {
		dev_printk(KERN_ERR, &pdev->dev, "failed to iomap PCI BAR 5\n");
		return rc;
	}

	host->ports[0]->ioaddr.scr_addr = svia_scr_addr(host->iomap[5], 0);
	host->ports[1]->ioaddr.scr_addr = svia_scr_addr(host->iomap[5], 1);

	return 0;
}

static int vt6421_prepare_host(struct pci_dev *pdev, struct ata_host **r_host)
{
	const struct ata_port_info *ppi[] =
		{ &vt6421_sport_info, &vt6421_sport_info, &vt6421_pport_info };
	struct ata_host *host;
	int i, rc;

	*r_host = host = ata_host_alloc_pinfo(&pdev->dev, ppi, ARRAY_SIZE(ppi));
	if (!host) {
		dev_printk(KERN_ERR, &pdev->dev, "failed to allocate host\n");
		return -ENOMEM;
	}

	rc = pcim_iomap_regions(pdev, 0x3f, DRV_NAME);
	if (rc) {
		dev_printk(KERN_ERR, &pdev->dev, "failed to request/iomap "
			   "PCI BARs (errno=%d)\n", rc);
		return rc;
	}
	host->iomap = pcim_iomap_table(pdev);

	for (i = 0; i < host->n_ports; i++)
		vt6421_init_addrs(host->ports[i]);

	rc = pci_set_dma_mask(pdev, ATA_DMA_MASK);
	if (rc)
		return rc;
	rc = pci_set_consistent_dma_mask(pdev, ATA_DMA_MASK);
	if (rc)
		return rc;

	return 0;
}

static void svia_configure(struct pci_dev *pdev)
{
	u8 tmp8;

	pci_read_config_byte(pdev, PCI_INTERRUPT_LINE, &tmp8);
	dev_printk(KERN_INFO, &pdev->dev, "routed to hard irq line %d\n",
	       (int) (tmp8 & 0xf0) == 0xf0 ? 0 : tmp8 & 0x0f);

	/* make sure SATA channels are enabled */
	pci_read_config_byte(pdev, SATA_CHAN_ENAB, &tmp8);
	if ((tmp8 & ALL_PORTS) != ALL_PORTS) {
		dev_printk(KERN_DEBUG, &pdev->dev,
			   "enabling SATA channels (0x%x)\n",
			   (int) tmp8);
		tmp8 |= ALL_PORTS;
		pci_write_config_byte(pdev, SATA_CHAN_ENAB, tmp8);
	}

	/* make sure interrupts for each channel sent to us */
	pci_read_config_byte(pdev, SATA_INT_GATE, &tmp8);
	if ((tmp8 & ALL_PORTS) != ALL_PORTS) {
		dev_printk(KERN_DEBUG, &pdev->dev,
			   "enabling SATA channel interrupts (0x%x)\n",
			   (int) tmp8);
		tmp8 |= ALL_PORTS;
		pci_write_config_byte(pdev, SATA_INT_GATE, tmp8);
	}

	/* make sure native mode is enabled */
	pci_read_config_byte(pdev, SATA_NATIVE_MODE, &tmp8);
	if ((tmp8 & NATIVE_MODE_ALL) != NATIVE_MODE_ALL) {
		dev_printk(KERN_DEBUG, &pdev->dev,
			   "enabling SATA channel native mode (0x%x)\n",
			   (int) tmp8);
		tmp8 |= NATIVE_MODE_ALL;
		pci_write_config_byte(pdev, SATA_NATIVE_MODE, tmp8);
	}
}

static int svia_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	static int printed_version;
	unsigned int i;
	int rc;
	struct ata_host *host;
	int board_id = (int) ent->driver_data;
	const unsigned *bar_sizes;

	if (!printed_version++)
		dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");

	rc = pcim_enable_device(pdev);
	if (rc)
		return rc;

	if (board_id == vt6420)
		bar_sizes = &svia_bar_sizes[0];
	else
		bar_sizes = &vt6421_bar_sizes[0];

	for (i = 0; i < ARRAY_SIZE(svia_bar_sizes); i++)
		if ((pci_resource_start(pdev, i) == 0) ||
		    (pci_resource_len(pdev, i) < bar_sizes[i])) {
			dev_printk(KERN_ERR, &pdev->dev,
				"invalid PCI BAR %u (sz 0x%llx, val 0x%llx)\n",
				i,
				(unsigned long long)pci_resource_start(pdev, i),
				(unsigned long long)pci_resource_len(pdev, i));
			return -ENODEV;
		}

	if (board_id == vt6420)
		rc = vt6420_prepare_host(pdev, &host);
	else
		rc = vt6421_prepare_host(pdev, &host);
	if (rc)
		return rc;

	svia_configure(pdev);

	pci_set_master(pdev);
	return ata_host_activate(host, pdev->irq, ata_sff_interrupt,
				 IRQF_SHARED, &svia_sht);
}

static int __init svia_init(void)
{
	return pci_register_driver(&svia_pci_driver);
}

static void __exit svia_exit(void)
{
	pci_unregister_driver(&svia_pci_driver);
}

module_init(svia_init);
module_exit(svia_exit);