xref: /openbmc/linux/drivers/ata/sata_qstor.c (revision b830f94f) 
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  sata_qstor.c - Pacific Digital Corporation QStor SATA
4  *
5  *  Maintained by:  Mark Lord <mlord@pobox.com>
6  *
7  *  Copyright 2005 Pacific Digital Corporation.
8  *  (OSL/GPL code release authorized by Jalil Fadavi).
9  *
10  *  libata documentation is available via 'make {ps|pdf}docs',
11  *  as Documentation/driver-api/libata.rst
12  */
13 
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/gfp.h>
17 #include <linux/pci.h>
18 #include <linux/blkdev.h>
19 #include <linux/delay.h>
20 #include <linux/interrupt.h>
21 #include <linux/device.h>
22 #include <scsi/scsi_host.h>
23 #include <linux/libata.h>
24 
25 #define DRV_NAME	"sata_qstor"
26 #define DRV_VERSION	"0.09"
27 
28 enum {
29 	QS_MMIO_BAR		= 4,
30 
31 	QS_PORTS		= 4,
32 	QS_MAX_PRD		= LIBATA_MAX_PRD,
33 	QS_CPB_ORDER		= 6,
34 	QS_CPB_BYTES		= (1 << QS_CPB_ORDER),
35 	QS_PRD_BYTES		= QS_MAX_PRD * 16,
36 	QS_PKT_BYTES		= QS_CPB_BYTES + QS_PRD_BYTES,
37 
38 	/* global register offsets */
39 	QS_HCF_CNFG3		= 0x0003, /* host configuration offset */
40 	QS_HID_HPHY		= 0x0004, /* host physical interface info */
41 	QS_HCT_CTRL		= 0x00e4, /* global interrupt mask offset */
42 	QS_HST_SFF		= 0x0100, /* host status fifo offset */
43 	QS_HVS_SERD3		= 0x0393, /* PHY enable offset */
44 
45 	/* global control bits */
46 	QS_HPHY_64BIT		= (1 << 1), /* 64-bit bus detected */
47 	QS_CNFG3_GSRST		= 0x01,     /* global chip reset */
48 	QS_SERD3_PHY_ENA	= 0xf0,     /* PHY detection ENAble*/
49 
50 	/* per-channel register offsets */
51 	QS_CCF_CPBA		= 0x0710, /* chan CPB base address */
52 	QS_CCF_CSEP		= 0x0718, /* chan CPB separation factor */
53 	QS_CFC_HUFT		= 0x0800, /* host upstream fifo threshold */
54 	QS_CFC_HDFT		= 0x0804, /* host downstream fifo threshold */
55 	QS_CFC_DUFT		= 0x0808, /* dev upstream fifo threshold */
56 	QS_CFC_DDFT		= 0x080c, /* dev downstream fifo threshold */
57 	QS_CCT_CTR0		= 0x0900, /* chan control-0 offset */
58 	QS_CCT_CTR1		= 0x0901, /* chan control-1 offset */
59 	QS_CCT_CFF		= 0x0a00, /* chan command fifo offset */
60 
61 	/* channel control bits */
62 	QS_CTR0_REG		= (1 << 1),   /* register mode (vs. pkt mode) */
63 	QS_CTR0_CLER		= (1 << 2),   /* clear channel errors */
64 	QS_CTR1_RDEV		= (1 << 1),   /* sata phy/comms reset */
65 	QS_CTR1_RCHN		= (1 << 4),   /* reset channel logic */
66 	QS_CCF_RUN_PKT		= 0x107,      /* RUN a new dma PKT */
67 
68 	/* pkt sub-field headers */
69 	QS_HCB_HDR		= 0x01,   /* Host Control Block header */
70 	QS_DCB_HDR		= 0x02,   /* Device Control Block header */
71 
72 	/* pkt HCB flag bits */
73 	QS_HF_DIRO		= (1 << 0),   /* data DIRection Out */
74 	QS_HF_DAT		= (1 << 3),   /* DATa pkt */
75 	QS_HF_IEN		= (1 << 4),   /* Interrupt ENable */
76 	QS_HF_VLD		= (1 << 5),   /* VaLiD pkt */
77 
78 	/* pkt DCB flag bits */
79 	QS_DF_PORD		= (1 << 2),   /* Pio OR Dma */
80 	QS_DF_ELBA		= (1 << 3),   /* Extended LBA (lba48) */
81 
82 	/* PCI device IDs */
83 	board_2068_idx		= 0,	/* QStor 4-port SATA/RAID */
84 };
85 
86 enum {
87 	QS_DMA_BOUNDARY		= ~0UL
88 };
89 
90 typedef enum { qs_state_mmio, qs_state_pkt } qs_state_t;
91 
92 struct qs_port_priv {
93 	u8			*pkt;
94 	dma_addr_t		pkt_dma;
95 	qs_state_t		state;
96 };
97 
98 static int qs_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
99 static int qs_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
100 static int qs_ata_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
101 static int qs_port_start(struct ata_port *ap);
102 static void qs_host_stop(struct ata_host *host);
103 static void qs_qc_prep(struct ata_queued_cmd *qc);
104 static unsigned int qs_qc_issue(struct ata_queued_cmd *qc);
105 static int qs_check_atapi_dma(struct ata_queued_cmd *qc);
106 static void qs_freeze(struct ata_port *ap);
107 static void qs_thaw(struct ata_port *ap);
108 static int qs_prereset(struct ata_link *link, unsigned long deadline);
109 static void qs_error_handler(struct ata_port *ap);
110 
111 static struct scsi_host_template qs_ata_sht = {
112 	ATA_BASE_SHT(DRV_NAME),
113 	.sg_tablesize		= QS_MAX_PRD,
114 	.dma_boundary		= QS_DMA_BOUNDARY,
115 };
116 
117 static struct ata_port_operations qs_ata_ops = {
118 	.inherits		= &ata_sff_port_ops,
119 
120 	.check_atapi_dma	= qs_check_atapi_dma,
121 	.qc_prep		= qs_qc_prep,
122 	.qc_issue		= qs_qc_issue,
123 
124 	.freeze			= qs_freeze,
125 	.thaw			= qs_thaw,
126 	.prereset		= qs_prereset,
127 	.softreset		= ATA_OP_NULL,
128 	.error_handler		= qs_error_handler,
129 	.lost_interrupt		= ATA_OP_NULL,
130 
131 	.scr_read		= qs_scr_read,
132 	.scr_write		= qs_scr_write,
133 
134 	.port_start		= qs_port_start,
135 	.host_stop		= qs_host_stop,
136 };
137 
138 static const struct ata_port_info qs_port_info[] = {
139 	/* board_2068_idx */
140 	{
141 		.flags		= ATA_FLAG_SATA | ATA_FLAG_PIO_POLLING,
142 		.pio_mask	= ATA_PIO4_ONLY,
143 		.udma_mask	= ATA_UDMA6,
144 		.port_ops	= &qs_ata_ops,
145 	},
146 };
147 
148 static const struct pci_device_id qs_ata_pci_tbl[] = {
149 	{ PCI_VDEVICE(PDC, 0x2068), board_2068_idx },
150 
151 	{ }	/* terminate list */
152 };
153 
154 static struct pci_driver qs_ata_pci_driver = {
155 	.name			= DRV_NAME,
156 	.id_table		= qs_ata_pci_tbl,
157 	.probe			= qs_ata_init_one,
158 	.remove			= ata_pci_remove_one,
159 };
160 
161 static void __iomem *qs_mmio_base(struct ata_host *host)
162 {
163 	return host->iomap[QS_MMIO_BAR];
164 }
165 
166 static int qs_check_atapi_dma(struct ata_queued_cmd *qc)
167 {
168 	return 1;	/* ATAPI DMA not supported */
169 }
170 
171 static inline void qs_enter_reg_mode(struct ata_port *ap)
172 {
173 	u8 __iomem *chan = qs_mmio_base(ap->host) + (ap->port_no * 0x4000);
174 	struct qs_port_priv *pp = ap->private_data;
175 
176 	pp->state = qs_state_mmio;
177 	writeb(QS_CTR0_REG, chan + QS_CCT_CTR0);
178 	readb(chan + QS_CCT_CTR0);        /* flush */
179 }
180 
181 static inline void qs_reset_channel_logic(struct ata_port *ap)
182 {
183 	u8 __iomem *chan = qs_mmio_base(ap->host) + (ap->port_no * 0x4000);
184 
185 	writeb(QS_CTR1_RCHN, chan + QS_CCT_CTR1);
186 	readb(chan + QS_CCT_CTR0);        /* flush */
187 	qs_enter_reg_mode(ap);
188 }
189 
190 static void qs_freeze(struct ata_port *ap)
191 {
192 	u8 __iomem *mmio_base = qs_mmio_base(ap->host);
193 
194 	writeb(0, mmio_base + QS_HCT_CTRL); /* disable host interrupts */
195 	qs_enter_reg_mode(ap);
196 }
197 
198 static void qs_thaw(struct ata_port *ap)
199 {
200 	u8 __iomem *mmio_base = qs_mmio_base(ap->host);
201 
202 	qs_enter_reg_mode(ap);
203 	writeb(1, mmio_base + QS_HCT_CTRL); /* enable host interrupts */
204 }
205 
206 static int qs_prereset(struct ata_link *link, unsigned long deadline)
207 {
208 	struct ata_port *ap = link->ap;
209 
210 	qs_reset_channel_logic(ap);
211 	return ata_sff_prereset(link, deadline);
212 }
213 
214 static int qs_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
215 {
216 	if (sc_reg > SCR_CONTROL)
217 		return -EINVAL;
218 	*val = readl(link->ap->ioaddr.scr_addr + (sc_reg * 8));
219 	return 0;
220 }
221 
222 static void qs_error_handler(struct ata_port *ap)
223 {
224 	qs_enter_reg_mode(ap);
225 	ata_sff_error_handler(ap);
226 }
227 
228 static int qs_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
229 {
230 	if (sc_reg > SCR_CONTROL)
231 		return -EINVAL;
232 	writel(val, link->ap->ioaddr.scr_addr + (sc_reg * 8));
233 	return 0;
234 }
235 
236 static unsigned int qs_fill_sg(struct ata_queued_cmd *qc)
237 {
238 	struct scatterlist *sg;
239 	struct ata_port *ap = qc->ap;
240 	struct qs_port_priv *pp = ap->private_data;
241 	u8 *prd = pp->pkt + QS_CPB_BYTES;
242 	unsigned int si;
243 
244 	for_each_sg(qc->sg, sg, qc->n_elem, si) {
245 		u64 addr;
246 		u32 len;
247 
248 		addr = sg_dma_address(sg);
249 		*(__le64 *)prd = cpu_to_le64(addr);
250 		prd += sizeof(u64);
251 
252 		len = sg_dma_len(sg);
253 		*(__le32 *)prd = cpu_to_le32(len);
254 		prd += sizeof(u64);
255 
256 		VPRINTK("PRD[%u] = (0x%llX, 0x%X)\n", si,
257 					(unsigned long long)addr, len);
258 	}
259 
260 	return si;
261 }
262 
263 static void qs_qc_prep(struct ata_queued_cmd *qc)
264 {
265 	struct qs_port_priv *pp = qc->ap->private_data;
266 	u8 dflags = QS_DF_PORD, *buf = pp->pkt;
267 	u8 hflags = QS_HF_DAT | QS_HF_IEN | QS_HF_VLD;
268 	u64 addr;
269 	unsigned int nelem;
270 
271 	VPRINTK("ENTER\n");
272 
273 	qs_enter_reg_mode(qc->ap);
274 	if (qc->tf.protocol != ATA_PROT_DMA)
275 		return;
276 
277 	nelem = qs_fill_sg(qc);
278 
279 	if ((qc->tf.flags & ATA_TFLAG_WRITE))
280 		hflags |= QS_HF_DIRO;
281 	if ((qc->tf.flags & ATA_TFLAG_LBA48))
282 		dflags |= QS_DF_ELBA;
283 
284 	/* host control block (HCB) */
285 	buf[ 0] = QS_HCB_HDR;
286 	buf[ 1] = hflags;
287 	*(__le32 *)(&buf[ 4]) = cpu_to_le32(qc->nbytes);
288 	*(__le32 *)(&buf[ 8]) = cpu_to_le32(nelem);
289 	addr = ((u64)pp->pkt_dma) + QS_CPB_BYTES;
290 	*(__le64 *)(&buf[16]) = cpu_to_le64(addr);
291 
292 	/* device control block (DCB) */
293 	buf[24] = QS_DCB_HDR;
294 	buf[28] = dflags;
295 
296 	/* frame information structure (FIS) */
297 	ata_tf_to_fis(&qc->tf, 0, 1, &buf[32]);
298 }
299 
300 static inline void qs_packet_start(struct ata_queued_cmd *qc)
301 {
302 	struct ata_port *ap = qc->ap;
303 	u8 __iomem *chan = qs_mmio_base(ap->host) + (ap->port_no * 0x4000);
304 
305 	VPRINTK("ENTER, ap %p\n", ap);
306 
307 	writeb(QS_CTR0_CLER, chan + QS_CCT_CTR0);
308 	wmb();                             /* flush PRDs and pkt to memory */
309 	writel(QS_CCF_RUN_PKT, chan + QS_CCT_CFF);
310 	readl(chan + QS_CCT_CFF);          /* flush */
311 }
312 
313 static unsigned int qs_qc_issue(struct ata_queued_cmd *qc)
314 {
315 	struct qs_port_priv *pp = qc->ap->private_data;
316 
317 	switch (qc->tf.protocol) {
318 	case ATA_PROT_DMA:
319 		pp->state = qs_state_pkt;
320 		qs_packet_start(qc);
321 		return 0;
322 
323 	case ATAPI_PROT_DMA:
324 		BUG();
325 		break;
326 
327 	default:
328 		break;
329 	}
330 
331 	pp->state = qs_state_mmio;
332 	return ata_sff_qc_issue(qc);
333 }
334 
335 static void qs_do_or_die(struct ata_queued_cmd *qc, u8 status)
336 {
337 	qc->err_mask |= ac_err_mask(status);
338 
339 	if (!qc->err_mask) {
340 		ata_qc_complete(qc);
341 	} else {
342 		struct ata_port    *ap  = qc->ap;
343 		struct ata_eh_info *ehi = &ap->link.eh_info;
344 
345 		ata_ehi_clear_desc(ehi);
346 		ata_ehi_push_desc(ehi, "status 0x%02X", status);
347 
348 		if (qc->err_mask == AC_ERR_DEV)
349 			ata_port_abort(ap);
350 		else
351 			ata_port_freeze(ap);
352 	}
353 }
354 
355 static inline unsigned int qs_intr_pkt(struct ata_host *host)
356 {
357 	unsigned int handled = 0;
358 	u8 sFFE;
359 	u8 __iomem *mmio_base = qs_mmio_base(host);
360 
361 	do {
362 		u32 sff0 = readl(mmio_base + QS_HST_SFF);
363 		u32 sff1 = readl(mmio_base + QS_HST_SFF + 4);
364 		u8 sEVLD = (sff1 >> 30) & 0x01;	/* valid flag */
365 		sFFE  = sff1 >> 31;		/* empty flag */
366 
367 		if (sEVLD) {
368 			u8 sDST = sff0 >> 16;	/* dev status */
369 			u8 sHST = sff1 & 0x3f;	/* host status */
370 			unsigned int port_no = (sff1 >> 8) & 0x03;
371 			struct ata_port *ap = host->ports[port_no];
372 			struct qs_port_priv *pp = ap->private_data;
373 			struct ata_queued_cmd *qc;
374 
375 			DPRINTK("SFF=%08x%08x: sCHAN=%u sHST=%d sDST=%02x\n",
376 					sff1, sff0, port_no, sHST, sDST);
377 			handled = 1;
378 			if (!pp || pp->state != qs_state_pkt)
379 				continue;
380 			qc = ata_qc_from_tag(ap, ap->link.active_tag);
381 			if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING))) {
382 				switch (sHST) {
383 				case 0: /* successful CPB */
384 				case 3: /* device error */
385 					qs_enter_reg_mode(qc->ap);
386 					qs_do_or_die(qc, sDST);
387 					break;
388 				default:
389 					break;
390 				}
391 			}
392 		}
393 	} while (!sFFE);
394 	return handled;
395 }
396 
397 static inline unsigned int qs_intr_mmio(struct ata_host *host)
398 {
399 	unsigned int handled = 0, port_no;
400 
401 	for (port_no = 0; port_no < host->n_ports; ++port_no) {
402 		struct ata_port *ap = host->ports[port_no];
403 		struct qs_port_priv *pp = ap->private_data;
404 		struct ata_queued_cmd *qc;
405 
406 		qc = ata_qc_from_tag(ap, ap->link.active_tag);
407 		if (!qc) {
408 			/*
409 			 * The qstor hardware generates spurious
410 			 * interrupts from time to time when switching
411 			 * in and out of packet mode.  There's no
412 			 * obvious way to know if we're here now due
413 			 * to that, so just ack the irq and pretend we
414 			 * knew it was ours.. (ugh).  This does not
415 			 * affect packet mode.
416 			 */
417 			ata_sff_check_status(ap);
418 			handled = 1;
419 			continue;
420 		}
421 
422 		if (!pp || pp->state != qs_state_mmio)
423 			continue;
424 		if (!(qc->tf.flags & ATA_TFLAG_POLLING))
425 			handled |= ata_sff_port_intr(ap, qc);
426 	}
427 	return handled;
428 }
429 
430 static irqreturn_t qs_intr(int irq, void *dev_instance)
431 {
432 	struct ata_host *host = dev_instance;
433 	unsigned int handled = 0;
434 	unsigned long flags;
435 
436 	VPRINTK("ENTER\n");
437 
438 	spin_lock_irqsave(&host->lock, flags);
439 	handled  = qs_intr_pkt(host) | qs_intr_mmio(host);
440 	spin_unlock_irqrestore(&host->lock, flags);
441 
442 	VPRINTK("EXIT\n");
443 
444 	return IRQ_RETVAL(handled);
445 }
446 
447 static void qs_ata_setup_port(struct ata_ioports *port, void __iomem *base)
448 {
449 	port->cmd_addr		=
450 	port->data_addr		= base + 0x400;
451 	port->error_addr	=
452 	port->feature_addr	= base + 0x408; /* hob_feature = 0x409 */
453 	port->nsect_addr	= base + 0x410; /* hob_nsect   = 0x411 */
454 	port->lbal_addr		= base + 0x418; /* hob_lbal    = 0x419 */
455 	port->lbam_addr		= base + 0x420; /* hob_lbam    = 0x421 */
456 	port->lbah_addr		= base + 0x428; /* hob_lbah    = 0x429 */
457 	port->device_addr	= base + 0x430;
458 	port->status_addr	=
459 	port->command_addr	= base + 0x438;
460 	port->altstatus_addr	=
461 	port->ctl_addr		= base + 0x440;
462 	port->scr_addr		= base + 0xc00;
463 }
464 
465 static int qs_port_start(struct ata_port *ap)
466 {
467 	struct device *dev = ap->host->dev;
468 	struct qs_port_priv *pp;
469 	void __iomem *mmio_base = qs_mmio_base(ap->host);
470 	void __iomem *chan = mmio_base + (ap->port_no * 0x4000);
471 	u64 addr;
472 
473 	pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL);
474 	if (!pp)
475 		return -ENOMEM;
476 	pp->pkt = dmam_alloc_coherent(dev, QS_PKT_BYTES, &pp->pkt_dma,
477 				      GFP_KERNEL);
478 	if (!pp->pkt)
479 		return -ENOMEM;
480 	ap->private_data = pp;
481 
482 	qs_enter_reg_mode(ap);
483 	addr = (u64)pp->pkt_dma;
484 	writel((u32) addr,        chan + QS_CCF_CPBA);
485 	writel((u32)(addr >> 32), chan + QS_CCF_CPBA + 4);
486 	return 0;
487 }
488 
489 static void qs_host_stop(struct ata_host *host)
490 {
491 	void __iomem *mmio_base = qs_mmio_base(host);
492 
493 	writeb(0, mmio_base + QS_HCT_CTRL); /* disable host interrupts */
494 	writeb(QS_CNFG3_GSRST, mmio_base + QS_HCF_CNFG3); /* global reset */
495 }
496 
497 static void qs_host_init(struct ata_host *host, unsigned int chip_id)
498 {
499 	void __iomem *mmio_base = host->iomap[QS_MMIO_BAR];
500 	unsigned int port_no;
501 
502 	writeb(0, mmio_base + QS_HCT_CTRL); /* disable host interrupts */
503 	writeb(QS_CNFG3_GSRST, mmio_base + QS_HCF_CNFG3); /* global reset */
504 
505 	/* reset each channel in turn */
506 	for (port_no = 0; port_no < host->n_ports; ++port_no) {
507 		u8 __iomem *chan = mmio_base + (port_no * 0x4000);
508 		writeb(QS_CTR1_RDEV|QS_CTR1_RCHN, chan + QS_CCT_CTR1);
509 		writeb(QS_CTR0_REG, chan + QS_CCT_CTR0);
510 		readb(chan + QS_CCT_CTR0);        /* flush */
511 	}
512 	writeb(QS_SERD3_PHY_ENA, mmio_base + QS_HVS_SERD3); /* enable phy */
513 
514 	for (port_no = 0; port_no < host->n_ports; ++port_no) {
515 		u8 __iomem *chan = mmio_base + (port_no * 0x4000);
516 		/* set FIFO depths to same settings as Windows driver */
517 		writew(32, chan + QS_CFC_HUFT);
518 		writew(32, chan + QS_CFC_HDFT);
519 		writew(10, chan + QS_CFC_DUFT);
520 		writew( 8, chan + QS_CFC_DDFT);
521 		/* set CPB size in bytes, as a power of two */
522 		writeb(QS_CPB_ORDER,    chan + QS_CCF_CSEP);
523 	}
524 	writeb(1, mmio_base + QS_HCT_CTRL); /* enable host interrupts */
525 }
526 
527 /*
528  * The QStor understands 64-bit buses, and uses 64-bit fields
529  * for DMA pointers regardless of bus width.  We just have to
530  * make sure our DMA masks are set appropriately for whatever
531  * bridge lies between us and the QStor, and then the DMA mapping
532  * code will ensure we only ever "see" appropriate buffer addresses.
533  * If we're 32-bit limited somewhere, then our 64-bit fields will
534  * just end up with zeros in the upper 32-bits, without any special
535  * logic required outside of this routine (below).
536  */
537 static int qs_set_dma_masks(struct pci_dev *pdev, void __iomem *mmio_base)
538 {
539 	u32 bus_info = readl(mmio_base + QS_HID_HPHY);
540 	int rc, have_64bit_bus = (bus_info & QS_HPHY_64BIT);
541 
542 	if (have_64bit_bus &&
543 	    !dma_set_mask(&pdev->dev, DMA_BIT_MASK(64))) {
544 		rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
545 		if (rc) {
546 			rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
547 			if (rc) {
548 				dev_err(&pdev->dev,
549 					"64-bit DMA enable failed\n");
550 				return rc;
551 			}
552 		}
553 	} else {
554 		rc = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
555 		if (rc) {
556 			dev_err(&pdev->dev, "32-bit DMA enable failed\n");
557 			return rc;
558 		}
559 		rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
560 		if (rc) {
561 			dev_err(&pdev->dev,
562 				"32-bit consistent DMA enable failed\n");
563 			return rc;
564 		}
565 	}
566 	return 0;
567 }
568 
569 static int qs_ata_init_one(struct pci_dev *pdev,
570 				const struct pci_device_id *ent)
571 {
572 	unsigned int board_idx = (unsigned int) ent->driver_data;
573 	const struct ata_port_info *ppi[] = { &qs_port_info[board_idx], NULL };
574 	struct ata_host *host;
575 	int rc, port_no;
576 
577 	ata_print_version_once(&pdev->dev, DRV_VERSION);
578 
579 	/* alloc host */
580 	host = ata_host_alloc_pinfo(&pdev->dev, ppi, QS_PORTS);
581 	if (!host)
582 		return -ENOMEM;
583 
584 	/* acquire resources and fill host */
585 	rc = pcim_enable_device(pdev);
586 	if (rc)
587 		return rc;
588 
589 	if ((pci_resource_flags(pdev, QS_MMIO_BAR) & IORESOURCE_MEM) == 0)
590 		return -ENODEV;
591 
592 	rc = pcim_iomap_regions(pdev, 1 << QS_MMIO_BAR, DRV_NAME);
593 	if (rc)
594 		return rc;
595 	host->iomap = pcim_iomap_table(pdev);
596 
597 	rc = qs_set_dma_masks(pdev, host->iomap[QS_MMIO_BAR]);
598 	if (rc)
599 		return rc;
600 
601 	for (port_no = 0; port_no < host->n_ports; ++port_no) {
602 		struct ata_port *ap = host->ports[port_no];
603 		unsigned int offset = port_no * 0x4000;
604 		void __iomem *chan = host->iomap[QS_MMIO_BAR] + offset;
605 
606 		qs_ata_setup_port(&ap->ioaddr, chan);
607 
608 		ata_port_pbar_desc(ap, QS_MMIO_BAR, -1, "mmio");
609 		ata_port_pbar_desc(ap, QS_MMIO_BAR, offset, "port");
610 	}
611 
612 	/* initialize adapter */
613 	qs_host_init(host, board_idx);
614 
615 	pci_set_master(pdev);
616 	return ata_host_activate(host, pdev->irq, qs_intr, IRQF_SHARED,
617 				 &qs_ata_sht);
618 }
619 
620 module_pci_driver(qs_ata_pci_driver);
621 
622 MODULE_AUTHOR("Mark Lord");
623 MODULE_DESCRIPTION("Pacific Digital Corporation QStor SATA low-level driver");
624 MODULE_LICENSE("GPL");
625 MODULE_DEVICE_TABLE(pci, qs_ata_pci_tbl);
626 MODULE_VERSION(DRV_VERSION);
627