xref: /openbmc/linux/drivers/ata/pata_hpt3x2n.c (revision 25df73d9)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Libata driver for the HighPoint 371N, 372N, and 302N UDMA66 ATA controllers.
4  *
5  * This driver is heavily based upon:
6  *
7  * linux/drivers/ide/pci/hpt366.c		Version 0.36	April 25, 2003
8  *
9  * Copyright (C) 1999-2003		Andre Hedrick <andre@linux-ide.org>
10  * Portions Copyright (C) 2001	        Sun Microsystems, Inc.
11  * Portions Copyright (C) 2003		Red Hat Inc
12  * Portions Copyright (C) 2005-2010	MontaVista Software, Inc.
13  *
14  *
15  * TODO
16  *	Work out best PLL policy
17  */
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/pci.h>
21 #include <linux/blkdev.h>
22 #include <linux/delay.h>
23 #include <scsi/scsi_host.h>
24 #include <linux/libata.h>
25 
26 #define DRV_NAME	"pata_hpt3x2n"
27 #define DRV_VERSION	"0.3.19"
28 
29 enum {
30 	PCI66		=	(1 << 1),
31 	USE_DPLL	=	(1 << 0)
32 };
33 
34 struct hpt_clock {
35 	u8	xfer_speed;
36 	u32	timing;
37 };
38 
39 /* key for bus clock timings
40  * bit
41  * 0:3    data_high_time. Inactive time of DIOW_/DIOR_ for PIO and MW DMA.
42  *        cycles = value + 1
43  * 4:8    data_low_time. Active time of DIOW_/DIOR_ for PIO and MW DMA.
44  *        cycles = value + 1
45  * 9:12   cmd_high_time. Inactive time of DIOW_/DIOR_ during task file
46  *        register access.
47  * 13:17  cmd_low_time. Active time of DIOW_/DIOR_ during task file
48  *        register access.
49  * 18:20  udma_cycle_time. Clock cycles for UDMA xfer.
50  * 21     CLK frequency for UDMA: 0=ATA clock, 1=dual ATA clock.
51  * 22:24  pre_high_time. Time to initialize 1st cycle for PIO and MW DMA xfer.
52  * 25:27  cmd_pre_high_time. Time to initialize 1st PIO cycle for task file
53  *        register access.
54  * 28     UDMA enable.
55  * 29     DMA  enable.
56  * 30     PIO_MST enable. If set, the chip is in bus master mode during
57  *        PIO xfer.
58  * 31     FIFO enable. Only for PIO.
59  */
60 
61 /* 66MHz DPLL clocks */
62 
63 static struct hpt_clock hpt3x2n_clocks[] = {
64 	{	XFER_UDMA_7,	0x1c869c62	},
65 	{	XFER_UDMA_6,	0x1c869c62	},
66 	{	XFER_UDMA_5,	0x1c8a9c62	},
67 	{	XFER_UDMA_4,	0x1c8a9c62	},
68 	{	XFER_UDMA_3,	0x1c8e9c62	},
69 	{	XFER_UDMA_2,	0x1c929c62	},
70 	{	XFER_UDMA_1,	0x1c9a9c62	},
71 	{	XFER_UDMA_0,	0x1c829c62	},
72 
73 	{	XFER_MW_DMA_2,	0x2c829c62	},
74 	{	XFER_MW_DMA_1,	0x2c829c66	},
75 	{	XFER_MW_DMA_0,	0x2c829d2e	},
76 
77 	{	XFER_PIO_4,	0x0c829c62	},
78 	{	XFER_PIO_3,	0x0c829c84	},
79 	{	XFER_PIO_2,	0x0c829ca6	},
80 	{	XFER_PIO_1,	0x0d029d26	},
81 	{	XFER_PIO_0,	0x0d029d5e	},
82 };
83 
84 /**
85  *	hpt3x2n_find_mode	-	reset the hpt3x2n bus
86  *	@ap: ATA port
87  *	@speed: transfer mode
88  *
89  *	Return the 32bit register programming information for this channel
90  *	that matches the speed provided. For the moment the clocks table
91  *	is hard coded but easy to change. This will be needed if we use
92  *	different DPLLs
93  */
94 
hpt3x2n_find_mode(struct ata_port * ap,int speed)95 static u32 hpt3x2n_find_mode(struct ata_port *ap, int speed)
96 {
97 	struct hpt_clock *clocks = hpt3x2n_clocks;
98 
99 	while (clocks->xfer_speed) {
100 		if (clocks->xfer_speed == speed)
101 			return clocks->timing;
102 		clocks++;
103 	}
104 	BUG();
105 	return 0xffffffffU;	/* silence compiler warning */
106 }
107 
108 /**
109  *	hpt372n_filter	-	mode selection filter
110  *	@adev: ATA device
111  *	@mask: mode mask
112  *
113  *	The Marvell bridge chips used on the HighPoint SATA cards do not seem
114  *	to support the UltraDMA modes 1, 2, and 3 as well as any MWDMA modes...
115  */
hpt372n_filter(struct ata_device * adev,unsigned int mask)116 static unsigned int hpt372n_filter(struct ata_device *adev, unsigned int mask)
117 {
118 	if (ata_id_is_sata(adev->id))
119 		mask &= ~((0xE << ATA_SHIFT_UDMA) | ATA_MASK_MWDMA);
120 
121 	return mask;
122 }
123 
124 /**
125  *	hpt3x2n_cable_detect	-	Detect the cable type
126  *	@ap: ATA port to detect on
127  *
128  *	Return the cable type attached to this port
129  */
130 
hpt3x2n_cable_detect(struct ata_port * ap)131 static int hpt3x2n_cable_detect(struct ata_port *ap)
132 {
133 	u8 scr2, ata66;
134 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
135 
136 	pci_read_config_byte(pdev, 0x5B, &scr2);
137 	pci_write_config_byte(pdev, 0x5B, scr2 & ~0x01);
138 
139 	udelay(10); /* debounce */
140 
141 	/* Cable register now active */
142 	pci_read_config_byte(pdev, 0x5A, &ata66);
143 	/* Restore state */
144 	pci_write_config_byte(pdev, 0x5B, scr2);
145 
146 	if (ata66 & (2 >> ap->port_no))
147 		return ATA_CBL_PATA40;
148 	else
149 		return ATA_CBL_PATA80;
150 }
151 
152 /**
153  *	hpt3x2n_pre_reset	-	reset the hpt3x2n bus
154  *	@link: ATA link to reset
155  *	@deadline: deadline jiffies for the operation
156  *
157  *	Perform the initial reset handling for the 3x2n series controllers.
158  *	Reset the hardware and state machine,
159  */
160 
hpt3x2n_pre_reset(struct ata_link * link,unsigned long deadline)161 static int hpt3x2n_pre_reset(struct ata_link *link, unsigned long deadline)
162 {
163 	struct ata_port *ap = link->ap;
164 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
165 	static const struct pci_bits hpt3x2n_enable_bits[] = {
166 		{ 0x50, 1, 0x04, 0x04 },
167 		{ 0x54, 1, 0x04, 0x04 }
168 	};
169 	u8 mcr2;
170 
171 	if (!pci_test_config_bits(pdev, &hpt3x2n_enable_bits[ap->port_no]))
172 		return -ENOENT;
173 
174 	/* Reset the state machine */
175 	pci_write_config_byte(pdev, 0x50 + 4 * ap->port_no, 0x37);
176 	udelay(100);
177 
178 	/* Fast interrupt prediction disable, hold off interrupt disable */
179 	pci_read_config_byte(pdev, 0x51 + 4 * ap->port_no, &mcr2);
180 	mcr2 &= ~0x07;
181 	pci_write_config_byte(pdev, 0x51 + 4 * ap->port_no, mcr2);
182 
183 	return ata_sff_prereset(link, deadline);
184 }
185 
hpt3x2n_set_mode(struct ata_port * ap,struct ata_device * adev,u8 mode)186 static void hpt3x2n_set_mode(struct ata_port *ap, struct ata_device *adev,
187 			     u8 mode)
188 {
189 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
190 	int addr = 0x40 + 4 * (adev->devno + 2 * ap->port_no);
191 	u32 reg, timing, mask;
192 
193 	/* Determine timing mask and find matching mode entry */
194 	if (mode < XFER_MW_DMA_0)
195 		mask = 0xcfc3ffff;
196 	else if (mode < XFER_UDMA_0)
197 		mask = 0x31c001ff;
198 	else
199 		mask = 0x303c0000;
200 
201 	timing = hpt3x2n_find_mode(ap, mode);
202 
203 	pci_read_config_dword(pdev, addr, &reg);
204 	reg = (reg & ~mask) | (timing & mask);
205 	pci_write_config_dword(pdev, addr, reg);
206 }
207 
208 /**
209  *	hpt3x2n_set_piomode		-	PIO setup
210  *	@ap: ATA interface
211  *	@adev: device on the interface
212  *
213  *	Perform PIO mode setup.
214  */
215 
hpt3x2n_set_piomode(struct ata_port * ap,struct ata_device * adev)216 static void hpt3x2n_set_piomode(struct ata_port *ap, struct ata_device *adev)
217 {
218 	hpt3x2n_set_mode(ap, adev, adev->pio_mode);
219 }
220 
221 /**
222  *	hpt3x2n_set_dmamode		-	DMA timing setup
223  *	@ap: ATA interface
224  *	@adev: Device being configured
225  *
226  *	Set up the channel for MWDMA or UDMA modes.
227  */
228 
hpt3x2n_set_dmamode(struct ata_port * ap,struct ata_device * adev)229 static void hpt3x2n_set_dmamode(struct ata_port *ap, struct ata_device *adev)
230 {
231 	hpt3x2n_set_mode(ap, adev, adev->dma_mode);
232 }
233 
234 /**
235  *	hpt3x2n_bmdma_stop		-	DMA engine stop
236  *	@qc: ATA command
237  *
238  *	Clean up after the HPT3x2n and later DMA engine
239  */
240 
hpt3x2n_bmdma_stop(struct ata_queued_cmd * qc)241 static void hpt3x2n_bmdma_stop(struct ata_queued_cmd *qc)
242 {
243 	struct ata_port *ap = qc->ap;
244 	struct pci_dev *pdev = to_pci_dev(ap->host->dev);
245 	int mscreg = 0x50 + 4 * ap->port_no;
246 	u8 bwsr_stat, msc_stat;
247 
248 	pci_read_config_byte(pdev, 0x6A, &bwsr_stat);
249 	pci_read_config_byte(pdev, mscreg, &msc_stat);
250 	if (bwsr_stat & (1 << ap->port_no))
251 		pci_write_config_byte(pdev, mscreg, msc_stat | 0x30);
252 	ata_bmdma_stop(qc);
253 }
254 
255 /**
256  *	hpt3x2n_set_clock	-	clock control
257  *	@ap: ATA port
258  *	@source: 0x21 or 0x23 for PLL or PCI sourced clock
259  *
260  *	Switch the ATA bus clock between the PLL and PCI clock sources
261  *	while correctly isolating the bus and resetting internal logic
262  *
263  *	We must use the DPLL for
264  *	-	writing
265  *	-	second channel UDMA7 (SATA ports) or higher
266  *	-	66MHz PCI
267  *
268  *	or we will underclock the device and get reduced performance.
269  */
270 
hpt3x2n_set_clock(struct ata_port * ap,int source)271 static void hpt3x2n_set_clock(struct ata_port *ap, int source)
272 {
273 	void __iomem *bmdma = ap->ioaddr.bmdma_addr - ap->port_no * 8;
274 
275 	/* Tristate the bus */
276 	iowrite8(0x80, bmdma+0x73);
277 	iowrite8(0x80, bmdma+0x77);
278 
279 	/* Switch clock and reset channels */
280 	iowrite8(source, bmdma+0x7B);
281 	iowrite8(0xC0, bmdma+0x79);
282 
283 	/* Reset state machines, avoid enabling the disabled channels */
284 	iowrite8(ioread8(bmdma+0x70) | 0x32, bmdma+0x70);
285 	iowrite8(ioread8(bmdma+0x74) | 0x32, bmdma+0x74);
286 
287 	/* Complete reset */
288 	iowrite8(0x00, bmdma+0x79);
289 
290 	/* Reconnect channels to bus */
291 	iowrite8(0x00, bmdma+0x73);
292 	iowrite8(0x00, bmdma+0x77);
293 }
294 
hpt3x2n_use_dpll(struct ata_port * ap,int writing)295 static int hpt3x2n_use_dpll(struct ata_port *ap, int writing)
296 {
297 	long flags = (long)ap->host->private_data;
298 
299 	/* See if we should use the DPLL */
300 	if (writing)
301 		return USE_DPLL;	/* Needed for write */
302 	if (flags & PCI66)
303 		return USE_DPLL;	/* Needed at 66Mhz */
304 	return 0;
305 }
306 
hpt3x2n_qc_defer(struct ata_queued_cmd * qc)307 static int hpt3x2n_qc_defer(struct ata_queued_cmd *qc)
308 {
309 	struct ata_port *ap = qc->ap;
310 	struct ata_port *alt = ap->host->ports[ap->port_no ^ 1];
311 	int rc, flags = (long)ap->host->private_data;
312 	int dpll = hpt3x2n_use_dpll(ap, qc->tf.flags & ATA_TFLAG_WRITE);
313 
314 	/* First apply the usual rules */
315 	rc = ata_std_qc_defer(qc);
316 	if (rc != 0)
317 		return rc;
318 
319 	if ((flags & USE_DPLL) != dpll && alt->qc_active)
320 		return ATA_DEFER_PORT;
321 	return 0;
322 }
323 
hpt3x2n_qc_issue(struct ata_queued_cmd * qc)324 static unsigned int hpt3x2n_qc_issue(struct ata_queued_cmd *qc)
325 {
326 	struct ata_port *ap = qc->ap;
327 	int flags = (long)ap->host->private_data;
328 	int dpll = hpt3x2n_use_dpll(ap, qc->tf.flags & ATA_TFLAG_WRITE);
329 
330 	if ((flags & USE_DPLL) != dpll) {
331 		flags &= ~USE_DPLL;
332 		flags |= dpll;
333 		ap->host->private_data = (void *)(long)flags;
334 
335 		hpt3x2n_set_clock(ap, dpll ? 0x21 : 0x23);
336 	}
337 	return ata_bmdma_qc_issue(qc);
338 }
339 
340 static const struct scsi_host_template hpt3x2n_sht = {
341 	ATA_BMDMA_SHT(DRV_NAME),
342 };
343 
344 /*
345  *	Configuration for HPT302N/371N.
346  */
347 
348 static struct ata_port_operations hpt3xxn_port_ops = {
349 	.inherits	= &ata_bmdma_port_ops,
350 
351 	.bmdma_stop	= hpt3x2n_bmdma_stop,
352 
353 	.qc_defer	= hpt3x2n_qc_defer,
354 	.qc_issue	= hpt3x2n_qc_issue,
355 
356 	.cable_detect	= hpt3x2n_cable_detect,
357 	.set_piomode	= hpt3x2n_set_piomode,
358 	.set_dmamode	= hpt3x2n_set_dmamode,
359 	.prereset	= hpt3x2n_pre_reset,
360 };
361 
362 /*
363  *	Configuration for HPT372N. Same as 302N/371N but we have a mode filter.
364  */
365 
366 static struct ata_port_operations hpt372n_port_ops = {
367 	.inherits	= &hpt3xxn_port_ops,
368 	.mode_filter	= &hpt372n_filter,
369 };
370 
371 /**
372  *	hpt3xn_calibrate_dpll		-	Calibrate the DPLL loop
373  *	@dev: PCI device
374  *
375  *	Perform a calibration cycle on the HPT3xN DPLL. Returns 1 if this
376  *	succeeds
377  */
378 
hpt3xn_calibrate_dpll(struct pci_dev * dev)379 static int hpt3xn_calibrate_dpll(struct pci_dev *dev)
380 {
381 	u8 reg5b;
382 	u32 reg5c;
383 	int tries;
384 
385 	for (tries = 0; tries < 0x5000; tries++) {
386 		udelay(50);
387 		pci_read_config_byte(dev, 0x5b, &reg5b);
388 		if (reg5b & 0x80) {
389 			/* See if it stays set */
390 			for (tries = 0; tries < 0x1000; tries++) {
391 				pci_read_config_byte(dev, 0x5b, &reg5b);
392 				/* Failed ? */
393 				if ((reg5b & 0x80) == 0)
394 					return 0;
395 			}
396 			/* Turn off tuning, we have the DPLL set */
397 			pci_read_config_dword(dev, 0x5c, &reg5c);
398 			pci_write_config_dword(dev, 0x5c, reg5c & ~0x100);
399 			return 1;
400 		}
401 	}
402 	/* Never went stable */
403 	return 0;
404 }
405 
hpt3x2n_pci_clock(struct pci_dev * pdev,unsigned int base)406 static int hpt3x2n_pci_clock(struct pci_dev *pdev, unsigned int base)
407 {
408 	unsigned int freq;
409 	u32 fcnt;
410 
411 	/*
412 	 * Some devices do not let this value be accessed via PCI space
413 	 * according to the old driver.
414 	 */
415 	fcnt = inl(pci_resource_start(pdev, 4) + 0x90);
416 	if ((fcnt >> 12) != 0xABCDE) {
417 		u32 total = 0;
418 		int i;
419 		u16 sr;
420 
421 		dev_warn(&pdev->dev, "BIOS clock data not set\n");
422 
423 		/* This is the process the HPT371 BIOS is reported to use */
424 		for (i = 0; i < 128; i++) {
425 			pci_read_config_word(pdev, 0x78, &sr);
426 			total += sr & 0x1FF;
427 			udelay(15);
428 		}
429 		fcnt = total / 128;
430 	}
431 	fcnt &= 0x1FF;
432 
433 	freq = (fcnt * base) / 192;	/* in MHz */
434 
435 	/* Clamp to bands */
436 	if (freq < 40)
437 		return 33;
438 	if (freq < 45)
439 		return 40;
440 	if (freq < 55)
441 		return 50;
442 	return 66;
443 }
444 
445 /**
446  *	hpt3x2n_init_one		-	Initialise an HPT37X/302
447  *	@dev: PCI device
448  *	@id: Entry in match table
449  *
450  *	Initialise an HPT3x2n device. There are some interesting complications
451  *	here. Firstly the chip may report 366 and be one of several variants.
452  *	Secondly all the timings depend on the clock for the chip which we must
453  *	detect and look up
454  *
455  *	This is the known chip mappings. It may be missing a couple of later
456  *	releases.
457  *
458  *	Chip version		PCI		Rev	Notes
459  *	HPT372			4 (HPT366)	5	Other driver
460  *	HPT372N			4 (HPT366)	6	UDMA133
461  *	HPT372			5 (HPT372)	1	Other driver
462  *	HPT372N			5 (HPT372)	2	UDMA133
463  *	HPT302			6 (HPT302)	*	Other driver
464  *	HPT302N			6 (HPT302)	> 1	UDMA133
465  *	HPT371			7 (HPT371)	*	Other driver
466  *	HPT371N			7 (HPT371)	> 1	UDMA133
467  *	HPT374			8 (HPT374)	*	Other driver
468  *	HPT372N			9 (HPT372N)	*	UDMA133
469  *
470  *	(1) UDMA133 support depends on the bus clock
471  */
472 
hpt3x2n_init_one(struct pci_dev * dev,const struct pci_device_id * id)473 static int hpt3x2n_init_one(struct pci_dev *dev, const struct pci_device_id *id)
474 {
475 	/* HPT372N - UDMA133 */
476 	static const struct ata_port_info info_hpt372n = {
477 		.flags = ATA_FLAG_SLAVE_POSS,
478 		.pio_mask = ATA_PIO4,
479 		.mwdma_mask = ATA_MWDMA2,
480 		.udma_mask = ATA_UDMA6,
481 		.port_ops = &hpt372n_port_ops
482 	};
483 	/* HPT302N and HPT371N - UDMA133 */
484 	static const struct ata_port_info info_hpt3xxn = {
485 		.flags = ATA_FLAG_SLAVE_POSS,
486 		.pio_mask = ATA_PIO4,
487 		.mwdma_mask = ATA_MWDMA2,
488 		.udma_mask = ATA_UDMA6,
489 		.port_ops = &hpt3xxn_port_ops
490 	};
491 	const struct ata_port_info *ppi[] = { &info_hpt3xxn, NULL };
492 	u8 rev = dev->revision;
493 	u8 irqmask;
494 	unsigned int pci_mhz;
495 	unsigned int f_low, f_high;
496 	int adjust;
497 	unsigned long iobase = pci_resource_start(dev, 4);
498 	void *hpriv = (void *)USE_DPLL;
499 	int rc;
500 
501 	rc = pcim_enable_device(dev);
502 	if (rc)
503 		return rc;
504 
505 	switch (dev->device) {
506 	case PCI_DEVICE_ID_TTI_HPT366:
507 		/* 372N if rev >= 6 */
508 		if (rev < 6)
509 			return -ENODEV;
510 		goto hpt372n;
511 	case PCI_DEVICE_ID_TTI_HPT371:
512 		/* 371N if rev >= 2 */
513 		if (rev < 2)
514 			return -ENODEV;
515 		break;
516 	case PCI_DEVICE_ID_TTI_HPT372:
517 		/* 372N if rev >= 2 */
518 		if (rev < 2)
519 			return -ENODEV;
520 		goto hpt372n;
521 	case PCI_DEVICE_ID_TTI_HPT302:
522 		/* 302N if rev >= 2 */
523 		if (rev < 2)
524 			return -ENODEV;
525 		break;
526 	case PCI_DEVICE_ID_TTI_HPT372N:
527 hpt372n:
528 		ppi[0] = &info_hpt372n;
529 		break;
530 	default:
531 		dev_err(&dev->dev,"PCI table is bogus, please report (%d)\n",
532 			dev->device);
533 		return -ENODEV;
534 	}
535 
536 	/* Ok so this is a chip we support */
537 
538 	pci_write_config_byte(dev, PCI_CACHE_LINE_SIZE, (L1_CACHE_BYTES / 4));
539 	pci_write_config_byte(dev, PCI_LATENCY_TIMER, 0x78);
540 	pci_write_config_byte(dev, PCI_MIN_GNT, 0x08);
541 	pci_write_config_byte(dev, PCI_MAX_LAT, 0x08);
542 
543 	pci_read_config_byte(dev, 0x5A, &irqmask);
544 	irqmask &= ~0x10;
545 	pci_write_config_byte(dev, 0x5a, irqmask);
546 
547 	/*
548 	 * HPT371 chips physically have only one channel, the secondary one,
549 	 * but the primary channel registers do exist!  Go figure...
550 	 * So,  we manually disable the non-existing channel here
551 	 * (if the BIOS hasn't done this already).
552 	 */
553 	if (dev->device == PCI_DEVICE_ID_TTI_HPT371) {
554 		u8 mcr1;
555 		pci_read_config_byte(dev, 0x50, &mcr1);
556 		mcr1 &= ~0x04;
557 		pci_write_config_byte(dev, 0x50, mcr1);
558 	}
559 
560 	/*
561 	 * Tune the PLL. HPT recommend using 75 for SATA, 66 for UDMA133 or
562 	 * 50 for UDMA100. Right now we always use 66
563 	 */
564 
565 	pci_mhz = hpt3x2n_pci_clock(dev, 77);
566 
567 	f_low = (pci_mhz * 48) / 66;	/* PCI Mhz for 66Mhz DPLL */
568 	f_high = f_low + 2;		/* Tolerance */
569 
570 	pci_write_config_dword(dev, 0x5C, (f_high << 16) | f_low | 0x100);
571 	/* PLL clock */
572 	pci_write_config_byte(dev, 0x5B, 0x21);
573 
574 	/* Unlike the 37x we don't try jiggling the frequency */
575 	for (adjust = 0; adjust < 8; adjust++) {
576 		if (hpt3xn_calibrate_dpll(dev))
577 			break;
578 		pci_write_config_dword(dev, 0x5C, (f_high << 16) | f_low);
579 	}
580 	if (adjust == 8) {
581 		dev_err(&dev->dev, "DPLL did not stabilize!\n");
582 		return -ENODEV;
583 	}
584 
585 	dev_info(&dev->dev, "bus clock %dMHz, using 66MHz DPLL\n", pci_mhz);
586 
587 	/*
588 	 * Set our private data up. We only need a few flags
589 	 * so we use it directly.
590 	 */
591 	if (pci_mhz > 60)
592 		hpriv = (void *)(PCI66 | USE_DPLL);
593 
594 	/*
595 	 * On  HPT371N, if ATA clock is 66 MHz we must set bit 2 in
596 	 * the MISC. register to stretch the UltraDMA Tss timing.
597 	 * NOTE: This register is only writeable via I/O space.
598 	 */
599 	if (dev->device == PCI_DEVICE_ID_TTI_HPT371)
600 		outb(inb(iobase + 0x9c) | 0x04, iobase + 0x9c);
601 
602 	/* Now kick off ATA set up */
603 	return ata_pci_bmdma_init_one(dev, ppi, &hpt3x2n_sht, hpriv, 0);
604 }
605 
606 static const struct pci_device_id hpt3x2n[] = {
607 	{ PCI_VDEVICE(TTI, PCI_DEVICE_ID_TTI_HPT366), },
608 	{ PCI_VDEVICE(TTI, PCI_DEVICE_ID_TTI_HPT371), },
609 	{ PCI_VDEVICE(TTI, PCI_DEVICE_ID_TTI_HPT372), },
610 	{ PCI_VDEVICE(TTI, PCI_DEVICE_ID_TTI_HPT302), },
611 	{ PCI_VDEVICE(TTI, PCI_DEVICE_ID_TTI_HPT372N), },
612 
613 	{ },
614 };
615 
616 static struct pci_driver hpt3x2n_pci_driver = {
617 	.name		= DRV_NAME,
618 	.id_table	= hpt3x2n,
619 	.probe		= hpt3x2n_init_one,
620 	.remove		= ata_pci_remove_one
621 };
622 
623 module_pci_driver(hpt3x2n_pci_driver);
624 
625 MODULE_AUTHOR("Alan Cox");
626 MODULE_DESCRIPTION("low-level driver for the Highpoint HPT3xxN");
627 MODULE_LICENSE("GPL");
628 MODULE_DEVICE_TABLE(pci, hpt3x2n);
629 MODULE_VERSION(DRV_VERSION);
630