summaryrefslogtreecommitdiffstats
path: root/drivers/ata/acard-ahci.c
blob: 3bc8c79bf2c7222e2e35f05f29032babf98a1746 (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

/*
 *  acard-ahci.c - ACard AHCI SATA support
 *
 *  Maintained by:  Jeff Garzik <jgarzik@pobox.com>
 *		    Please ALWAYS copy linux-ide@vger.kernel.org
 *		    on emails.
 *
 *  Copyright 2010 Red Hat, Inc.
 *
 *
 *  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.*
 *
 * AHCI hardware documentation:
 * http://www.intel.com/technology/serialata/pdf/rev1_0.pdf
 * http://www.intel.com/technology/serialata/pdf/rev1_1.pdf
 *
 */

#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/interrupt.h>
#include <linux/dma-mapping.h>
#include <linux/device.h>
#include <linux/dmi.h>
#include <linux/gfp.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_cmnd.h>
#include <linux/libata.h>
#include "ahci.h"

#define DRV_NAME	"acard-ahci"
#define DRV_VERSION	"1.0"

/*
  Received FIS structure limited to 80h.
*/

#define ACARD_AHCI_RX_FIS_SZ 128

enum {
	AHCI_PCI_BAR		= 5,
};

enum board_ids {
	board_acard_ahci,
};

struct acard_sg {
	__le32			addr;
	__le32			addr_hi;
	__le32			reserved;
	__le32			size;	 /* bit 31 (EOT) max==0x10000 (64k) */
};

static void acard_ahci_qc_prep(struct ata_queued_cmd *qc);
static bool acard_ahci_qc_fill_rtf(struct ata_queued_cmd *qc);
static int acard_ahci_port_start(struct ata_port *ap);
static int acard_ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);

#ifdef CONFIG_PM
static int acard_ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
static int acard_ahci_pci_device_resume(struct pci_dev *pdev);
#endif

static struct scsi_host_template acard_ahci_sht = {
	AHCI_SHT("acard-ahci"),
};

static struct ata_port_operations acard_ops = {
	.inherits		= &ahci_ops,
	.qc_prep		= acard_ahci_qc_prep,
	.qc_fill_rtf		= acard_ahci_qc_fill_rtf,
	.port_start             = acard_ahci_port_start,
};

#define AHCI_HFLAGS(flags)	.private_data	= (void *)(flags)

static const struct ata_port_info acard_ahci_port_info[] = {
	[board_acard_ahci] =
	{
		AHCI_HFLAGS	(AHCI_HFLAG_NO_NCQ),
		.flags		= AHCI_FLAG_COMMON,
		.pio_mask	= ATA_PIO4,
		.udma_mask	= ATA_UDMA6,
		.port_ops	= &acard_ops,
	},
};

static const struct pci_device_id acard_ahci_pci_tbl[] = {
	/* ACard */
	{ PCI_VDEVICE(ARTOP, 0x000d), board_acard_ahci }, /* ATP8620 */

	{ }    /* terminate list */
};

static struct pci_driver acard_ahci_pci_driver = {
	.name			= DRV_NAME,
	.id_table		= acard_ahci_pci_tbl,
	.probe			= acard_ahci_init_one,
	.remove			= ata_pci_remove_one,
#ifdef CONFIG_PM
	.suspend		= acard_ahci_pci_device_suspend,
	.resume			= acard_ahci_pci_device_resume,
#endif
};

#ifdef CONFIG_PM
static int acard_ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
{
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
	struct ahci_host_priv *hpriv = host->private_data;
	void __iomem *mmio = hpriv->mmio;
	u32 ctl;

	if (mesg.event & PM_EVENT_SUSPEND &&
	    hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
		dev_err(&pdev->dev,
			"BIOS update required for suspend/resume\n");
		return -EIO;
	}

	if (mesg.event & PM_EVENT_SLEEP) {
		/* AHCI spec rev1.1 section 8.3.3:
		 * Software must disable interrupts prior to requesting a
		 * transition of the HBA to D3 state.
		 */
		ctl = readl(mmio + HOST_CTL);
		ctl &= ~HOST_IRQ_EN;
		writel(ctl, mmio + HOST_CTL);
		readl(mmio + HOST_CTL); /* flush */
	}

	return ata_pci_device_suspend(pdev, mesg);
}

static int acard_ahci_pci_device_resume(struct pci_dev *pdev)
{
	struct ata_host *host = dev_get_drvdata(&pdev->dev);
	int rc;

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

	if (pdev->dev.power.power_state.event == PM_EVENT_SUSPEND) {
		rc = ahci_reset_controller(host);
		if (rc)
			return rc;

		ahci_init_controller(host);
	}

	ata_host_resume(host);

	return 0;
}
#endif

static int acard_ahci_configure_dma_masks(struct pci_dev *pdev, int using_dac)
{
	int rc;

	if (using_dac &&
	    !pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
		rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
		if (rc) {
			rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
			if (rc) {
				dev_err(&pdev->dev,
					   "64-bit DMA enable failed\n");
				return rc;
			}
		}
	} else {
		rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
		if (rc) {
			dev_err(&pdev->dev, "32-bit DMA enable failed\n");
			return rc;
		}
		rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
		if (rc) {
			dev_err(&pdev->dev,
				"32-bit consistent DMA enable failed\n");
			return rc;
		}
	}
	return 0;
}

static void acard_ahci_pci_print_info(struct ata_host *host)
{
	struct pci_dev *pdev = to_pci_dev(host->dev);
	u16 cc;
	const char *scc_s;

	pci_read_config_word(pdev, 0x0a, &cc);
	if (cc == PCI_CLASS_STORAGE_IDE)
		scc_s = "IDE";
	else if (cc == PCI_CLASS_STORAGE_SATA)
		scc_s = "SATA";
	else if (cc == PCI_CLASS_STORAGE_RAID)
		scc_s = "RAID";
	else
		scc_s = "unknown";

	ahci_print_info(host, scc_s);
}

static unsigned int acard_ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
{
	struct scatterlist *sg;
	struct acard_sg *acard_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
	unsigned int si, last_si = 0;

	VPRINTK("ENTER\n");

	/*
	 * Next, the S/G list.
	 */
	for_each_sg(qc->sg, sg, qc->n_elem, si) {
		dma_addr_t addr = sg_dma_address(sg);
		u32 sg_len = sg_dma_len(sg);

		/*
		 * ACard note:
		 * We must set an end-of-table (EOT) bit,
		 * and the segment cannot exceed 64k (0x10000)
		 */
		acard_sg[si].addr = cpu_to_le32(addr & 0xffffffff);
		acard_sg[si].addr_hi = cpu_to_le32((addr >> 16) >> 16);
		acard_sg[si].size = cpu_to_le32(sg_len);
		last_si = si;
	}

	acard_sg[last_si].size |= cpu_to_le32(1 << 31);	/* set EOT */

	return si;
}

static void acard_ahci_qc_prep(struct ata_queued_cmd *qc)
{
	struct ata_port *ap = qc->ap;
	struct ahci_port_priv *pp = ap->private_data;
	int is_atapi = ata_is_atapi(qc->tf.protocol);
	void *cmd_tbl;
	u32 opts;
	const u32 cmd_fis_len = 5; /* five dwords */
	unsigned int n_elem;

	/*
	 * Fill in command table information.  First, the header,
	 * a SATA Register - Host to Device command FIS.
	 */
	cmd_tbl = pp->cmd_tbl + qc->tag * AHCI_CMD_TBL_SZ;

	ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, cmd_tbl);
	if (is_atapi) {
		memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
		memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
	}

	n_elem = 0;
	if (qc->flags & ATA_QCFLAG_DMAMAP)
		n_elem = acard_ahci_fill_sg(qc, cmd_tbl);

	/*
	 * Fill in command slot information.
	 *
	 * ACard note: prd table length not filled in
	 */
	opts = cmd_fis_len | (qc->dev->link->pmp << 12);
	if (qc->tf.flags & ATA_TFLAG_WRITE)
		opts |= AHCI_CMD_WRITE;
	if (is_atapi)
		opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;

	ahci_fill_cmd_slot(pp, qc->tag, opts);
}

static bool acard_ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
{
	struct ahci_port_priv *pp = qc->ap->private_data;
	u8 *rx_fis = pp->rx_fis;

	if (pp->fbs_enabled)
		rx_fis += qc->dev->link->pmp * ACARD_AHCI_RX_FIS_SZ;

	/*
	 * After a successful execution of an ATA PIO data-in command,
	 * the device doesn't send D2H Reg FIS to update the TF and
	 * the host should take TF and E_Status from the preceding PIO
	 * Setup FIS.
	 */
	if (qc->tf.protocol == ATA_PROT_PIO && qc->dma_dir == DMA_FROM_DEVICE &&
	    !(qc->flags & ATA_QCFLAG_FAILED)) {
		ata_tf_from_fis(rx_fis + RX_FIS_PIO_SETUP, &qc->result_tf);
		qc->result_tf.command = (rx_fis + RX_FIS_PIO_SETUP)[15];
	} else
		ata_tf_from_fis(rx_fis + RX_FIS_D2H_REG, &qc->result_tf);

	return true;
}

static int acard_ahci_port_start(struct ata_port *ap)
{
	struct ahci_host_priv *hpriv = ap->host->private_data;
	struct device *dev = ap->host->dev;
	struct ahci_port_priv *pp;
	void *mem;
	dma_addr_t mem_dma;
	size_t dma_sz, rx_fis_sz;

	pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
	if (!pp)
		return -ENOMEM;

	/* check FBS capability */
	if ((hpriv->cap & HOST_CAP_FBS) && sata_pmp_supported(ap)) {
		void __iomem *port_mmio = ahci_port_base(ap);
		u32 cmd = readl(port_mmio + PORT_CMD);
		if (cmd & PORT_CMD_FBSCP)
			pp->fbs_supported = true;
		else if (hpriv->flags & AHCI_HFLAG_YES_FBS) {
			dev_info(dev, "port %d can do FBS, forcing FBSCP\n",
				 ap->port_no);
			pp->fbs_supported = true;
		} else
			dev_warn(dev, "port %d is not capable of FBS\n",
				 ap->port_no);
	}

	if (pp->fbs_supported) {
		dma_sz = AHCI_PORT_PRIV_FBS_DMA_SZ;
		rx_fis_sz = ACARD_AHCI_RX_FIS_SZ * 16;
	} else {
		dma_sz = AHCI_PORT_PRIV_DMA_SZ;
		rx_fis_sz = ACARD_AHCI_RX_FIS_SZ;
	}

	mem = dmam_alloc_coherent(dev, dma_sz, &mem_dma, GFP_KERNEL);
	if (!mem)
		return -ENOMEM;
	memset(mem, 0, dma_sz);

	/*
	 * First item in chunk of DMA memory: 32-slot command table,
	 * 32 bytes each in size
	 */
	pp->cmd_slot = mem;
	pp->cmd_slot_dma = mem_dma;

	mem += AHCI_CMD_SLOT_SZ;
	mem_dma += AHCI_CMD_SLOT_SZ;

	/*
	 * Second item: Received-FIS area
	 */
	pp->rx_fis = mem;
	pp->rx_fis_dma = mem_dma;

	mem += rx_fis_sz;
	mem_dma += rx_fis_sz;

	/*
	 * Third item: data area for storing a single command
	 * and its scatter-gather table
	 */
	pp->cmd_tbl = mem;
	pp->cmd_tbl_dma = mem_dma;

	/*
	 * Save off initial list of interrupts to be enabled.
	 * This could be changed later
	 */
	pp->intr_mask = DEF_PORT_IRQ;

	ap->private_data = pp;

	/* engage engines, captain */
	return ahci_port_resume(ap);
}

static int acard_ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	unsigned int board_id = ent->driver_data;
	struct ata_port_info pi = acard_ahci_port_info[board_id];
	const struct ata_port_info *ppi[] = { &pi, NULL };
	struct device *dev = &pdev->dev;
	struct ahci_host_priv *hpriv;
	struct ata_host *host;
	int n_ports, i, rc;

	VPRINTK("ENTER\n");

	WARN_ON((int)ATA_MAX_QUEUE > AHCI_MAX_CMDS);

	ata_print_version_once(&pdev->dev, DRV_VERSION);

	/* acquire resources */
	rc = pcim_enable_device(pdev);
	if (rc)
		return rc;

	/* AHCI controllers often implement SFF compatible interface.
	 * Grab all PCI BARs just in case.
	 */
	rc = pcim_iomap_regions_request_all(pdev, 1 << AHCI_PCI_BAR, DRV_NAME);
	if (rc == -EBUSY)
		pcim_pin_device(pdev);
	if (rc)
		return rc;

	hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
	if (!hpriv)
		return -ENOMEM;
	hpriv->flags |= (unsigned long)pi.private_data;

	if (!(hpriv->flags & AHCI_HFLAG_NO_MSI))
		pci_enable_msi(pdev);

	hpriv->mmio = pcim_iomap_table(pdev)[AHCI_PCI_BAR];

	/* save initial config */
	ahci_save_initial_config(&pdev->dev, hpriv, 0, 0);

	/* prepare host */
	if (hpriv->cap & HOST_CAP_NCQ)
		pi.flags |= ATA_FLAG_NCQ;

	if (hpriv->cap & HOST_CAP_PMP)
		pi.flags |= ATA_FLAG_PMP;

	ahci_set_em_messages(hpriv, &pi);

	/* CAP.NP sometimes indicate the index of the last enabled
	 * port, at other times, that of the last possible port, so
	 * determining the maximum port number requires looking at
	 * both CAP.NP and port_map.
	 */
	n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));

	host = ata_host_alloc_pinfo(&pdev->dev, ppi, n_ports);
	if (!host)
		return -ENOMEM;
	host->private_data = hpriv;

	if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
		host->flags |= ATA_HOST_PARALLEL_SCAN;
	else
		printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n");

	for (i = 0; i < host->n_ports; i++) {
		struct ata_port *ap = host->ports[i];

		ata_port_pbar_desc(ap, AHCI_PCI_BAR, -1, "abar");
		ata_port_pbar_desc(ap, AHCI_PCI_BAR,
				   0x100 + ap->port_no * 0x80, "port");

		/* set initial link pm policy */
		/*
		ap->pm_policy = NOT_AVAILABLE;
		*/
		/* disabled/not-implemented port */
		if (!(hpriv->port_map & (1 << i)))
			ap->ops = &ata_dummy_port_ops;
	}

	/* initialize adapter */
	rc = acard_ahci_configure_dma_masks(pdev, hpriv->cap & HOST_CAP_64);
	if (rc)
		return rc;

	rc = ahci_reset_controller(host);
	if (rc)
		return rc;

	ahci_init_controller(host);
	acard_ahci_pci_print_info(host);

	pci_set_master(pdev);
	return ata_host_activate(host, pdev->irq, ahci_interrupt, IRQF_SHARED,
				 &acard_ahci_sht);
}

static int __init acard_ahci_init(void)
{
	return pci_register_driver(&acard_ahci_pci_driver);
}

static void __exit acard_ahci_exit(void)
{
	pci_unregister_driver(&acard_ahci_pci_driver);
}

MODULE_AUTHOR("Jeff Garzik");
MODULE_DESCRIPTION("ACard AHCI SATA low-level driver");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, acard_ahci_pci_tbl);
MODULE_VERSION(DRV_VERSION);

module_init(acard_ahci_init);
module_exit(acard_ahci_exit);
OpenPOWER on IntegriCloud