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Tools: hv: kvp: eliminate 'may be used uninitialized' warning
[linux/fpc-iii.git] / drivers / ata / sata_via.c
blobf3f538eec7b3bb85b682368ffb42496989c97263
1 /*
2 * sata_via.c - VIA Serial ATA controllers
3 *
4 * Maintained by: Tejun Heo <tj@kernel.org>
5 * Please ALWAYS copy linux-ide@vger.kernel.org
6 * on emails.
7 *
8 * Copyright 2003-2004 Red Hat, Inc. All rights reserved.
9 * Copyright 2003-2004 Jeff Garzik
10 *
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; see the file COPYING. If not, write to
24 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
25 *
26 *
27 * libata documentation is available via 'make {ps|pdf}docs',
28 * as Documentation/DocBook/libata.*
29 *
30 * Hardware documentation available under NDA.
31 *
32 *
33 *
34 */
35
36 #include <linux/kernel.h>
37 #include <linux/module.h>
38 #include <linux/pci.h>
39 #include <linux/blkdev.h>
40 #include <linux/delay.h>
41 #include <linux/device.h>
42 #include <scsi/scsi.h>
43 #include <scsi/scsi_cmnd.h>
44 #include <scsi/scsi_host.h>
45 #include <linux/libata.h>
46
47 #define DRV_NAME "sata_via"
48 #define DRV_VERSION "2.6"
49
50 /*
51 * vt8251 is different from other sata controllers of VIA. It has two
52 * channels, each channel has both Master and Slave slot.
53 */
54 enum board_ids_enum {
55 vt6420,
56 vt6421,
57 vt8251,
58 };
59
60 enum {
61 SATA_CHAN_ENAB = 0x40, /* SATA channel enable */
62 SATA_INT_GATE = 0x41, /* SATA interrupt gating */
63 SATA_NATIVE_MODE = 0x42, /* Native mode enable */
64 SVIA_MISC_3 = 0x46, /* Miscellaneous Control III */
65 PATA_UDMA_TIMING = 0xB3, /* PATA timing for DMA/ cable detect */
66 PATA_PIO_TIMING = 0xAB, /* PATA timing register */
67
68 PORT0 = (1 << 1),
69 PORT1 = (1 << 0),
70 ALL_PORTS = PORT0 | PORT1,
71
72 NATIVE_MODE_ALL = (1 << 7) | (1 << 6) | (1 << 5) | (1 << 4),
73
74 SATA_EXT_PHY = (1 << 6), /* 0==use PATA, 1==ext phy */
75
76 SATA_HOTPLUG = (1 << 5), /* enable IRQ on hotplug */
77 };
78
79 struct svia_priv {
80 bool wd_workaround;
81 };
82
83 static int svia_init_one(struct pci_dev *pdev, const struct pci_device_id *ent);
84 #ifdef CONFIG_PM_SLEEP
85 static int svia_pci_device_resume(struct pci_dev *pdev);
86 #endif
87 static int svia_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
88 static int svia_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
89 static int vt8251_scr_read(struct ata_link *link, unsigned int scr, u32 *val);
90 static int vt8251_scr_write(struct ata_link *link, unsigned int scr, u32 val);
91 static void svia_tf_load(struct ata_port *ap, const struct ata_taskfile *tf);
92 static void svia_noop_freeze(struct ata_port *ap);
93 static int vt6420_prereset(struct ata_link *link, unsigned long deadline);
94 static void vt6420_bmdma_start(struct ata_queued_cmd *qc);
95 static int vt6421_pata_cable_detect(struct ata_port *ap);
96 static void vt6421_set_pio_mode(struct ata_port *ap, struct ata_device *adev);
97 static void vt6421_set_dma_mode(struct ata_port *ap, struct ata_device *adev);
98 static void vt6421_error_handler(struct ata_port *ap);
99
100 static const struct pci_device_id svia_pci_tbl[] = {
101 { PCI_VDEVICE(VIA, 0x5337), vt6420 },
102 { PCI_VDEVICE(VIA, 0x0591), vt6420 }, /* 2 sata chnls (Master) */
103 { PCI_VDEVICE(VIA, 0x3149), vt6420 }, /* 2 sata chnls (Master) */
104 { PCI_VDEVICE(VIA, 0x3249), vt6421 }, /* 2 sata chnls, 1 pata chnl */
105 { PCI_VDEVICE(VIA, 0x5372), vt6420 },
106 { PCI_VDEVICE(VIA, 0x7372), vt6420 },
107 { PCI_VDEVICE(VIA, 0x5287), vt8251 }, /* 2 sata chnls (Master/Slave) */
108 { PCI_VDEVICE(VIA, 0x9000), vt8251 },
109
110 { } /* terminate list */
111 };
112
113 static struct pci_driver svia_pci_driver = {
114 .name = DRV_NAME,
115 .id_table = svia_pci_tbl,
116 .probe = svia_init_one,
117 #ifdef CONFIG_PM_SLEEP
118 .suspend = ata_pci_device_suspend,
119 .resume = svia_pci_device_resume,
120 #endif
121 .remove = ata_pci_remove_one,
122 };
123
124 static struct scsi_host_template svia_sht = {
125 ATA_BMDMA_SHT(DRV_NAME),
126 };
127
128 static struct ata_port_operations svia_base_ops = {
129 .inherits = &ata_bmdma_port_ops,
130 .sff_tf_load = svia_tf_load,
131 };
132
133 static struct ata_port_operations vt6420_sata_ops = {
134 .inherits = &svia_base_ops,
135 .freeze = svia_noop_freeze,
136 .prereset = vt6420_prereset,
137 .bmdma_start = vt6420_bmdma_start,
138 };
139
140 static struct ata_port_operations vt6421_pata_ops = {
141 .inherits = &svia_base_ops,
142 .cable_detect = vt6421_pata_cable_detect,
143 .set_piomode = vt6421_set_pio_mode,
144 .set_dmamode = vt6421_set_dma_mode,
145 };
146
147 static struct ata_port_operations vt6421_sata_ops = {
148 .inherits = &svia_base_ops,
149 .scr_read = svia_scr_read,
150 .scr_write = svia_scr_write,
151 .error_handler = vt6421_error_handler,
152 };
153
154 static struct ata_port_operations vt8251_ops = {
155 .inherits = &svia_base_ops,
156 .hardreset = sata_std_hardreset,
157 .scr_read = vt8251_scr_read,
158 .scr_write = vt8251_scr_write,
159 };
160
161 static const struct ata_port_info vt6420_port_info = {
162 .flags = ATA_FLAG_SATA,
163 .pio_mask = ATA_PIO4,
164 .mwdma_mask = ATA_MWDMA2,
165 .udma_mask = ATA_UDMA6,
166 .port_ops = &vt6420_sata_ops,
167 };
168
169 static struct ata_port_info vt6421_sport_info = {
170 .flags = ATA_FLAG_SATA,
171 .pio_mask = ATA_PIO4,
172 .mwdma_mask = ATA_MWDMA2,
173 .udma_mask = ATA_UDMA6,
174 .port_ops = &vt6421_sata_ops,
175 };
176
177 static struct ata_port_info vt6421_pport_info = {
178 .flags = ATA_FLAG_SLAVE_POSS,
179 .pio_mask = ATA_PIO4,
180 /* No MWDMA */
181 .udma_mask = ATA_UDMA6,
182 .port_ops = &vt6421_pata_ops,
183 };
184
185 static struct ata_port_info vt8251_port_info = {
186 .flags = ATA_FLAG_SATA | ATA_FLAG_SLAVE_POSS,
187 .pio_mask = ATA_PIO4,
188 .mwdma_mask = ATA_MWDMA2,
189 .udma_mask = ATA_UDMA6,
190 .port_ops = &vt8251_ops,
191 };
192
193 MODULE_AUTHOR("Jeff Garzik");
194 MODULE_DESCRIPTION("SCSI low-level driver for VIA SATA controllers");
195 MODULE_LICENSE("GPL");
196 MODULE_DEVICE_TABLE(pci, svia_pci_tbl);
197 MODULE_VERSION(DRV_VERSION);
198
199 static int svia_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
200 {
201 if (sc_reg > SCR_CONTROL)
202 return -EINVAL;
203 *val = ioread32(link->ap->ioaddr.scr_addr + (4 * sc_reg));
204 return 0;
205 }
206
207 static int svia_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
208 {
209 if (sc_reg > SCR_CONTROL)
210 return -EINVAL;
211 iowrite32(val, link->ap->ioaddr.scr_addr + (4 * sc_reg));
212 return 0;
213 }
214
215 static int vt8251_scr_read(struct ata_link *link, unsigned int scr, u32 *val)
216 {
217 static const u8 ipm_tbl[] = { 1, 2, 6, 0 };
218 struct pci_dev *pdev = to_pci_dev(link->ap->host->dev);
219 int slot = 2 * link->ap->port_no + link->pmp;
220 u32 v = 0;
221 u8 raw;
222
223 switch (scr) {
224 case SCR_STATUS:
225 pci_read_config_byte(pdev, 0xA0 + slot, &raw);
226
227 /* read the DET field, bit0 and 1 of the config byte */
228 v |= raw & 0x03;
229
230 /* read the SPD field, bit4 of the configure byte */
231 if (raw & (1 << 4))
232 v |= 0x02 << 4;
233 else
234 v |= 0x01 << 4;
235
236 /* read the IPM field, bit2 and 3 of the config byte */
237 v |= ipm_tbl[(raw >> 2) & 0x3];
238 break;
239
240 case SCR_ERROR:
241 /* devices other than 5287 uses 0xA8 as base */
242 WARN_ON(pdev->device != 0x5287);
243 pci_read_config_dword(pdev, 0xB0 + slot * 4, &v);
244 break;
245
246 case SCR_CONTROL:
247 pci_read_config_byte(pdev, 0xA4 + slot, &raw);
248
249 /* read the DET field, bit0 and bit1 */
250 v |= ((raw & 0x02) << 1) | (raw & 0x01);
251
252 /* read the IPM field, bit2 and bit3 */
253 v |= ((raw >> 2) & 0x03) << 8;
254 break;
255
256 default:
257 return -EINVAL;
258 }
259
260 *val = v;
261 return 0;
262 }
263
264 static int vt8251_scr_write(struct ata_link *link, unsigned int scr, u32 val)
265 {
266 struct pci_dev *pdev = to_pci_dev(link->ap->host->dev);
267 int slot = 2 * link->ap->port_no + link->pmp;
268 u32 v = 0;
269
270 switch (scr) {
271 case SCR_ERROR:
272 /* devices other than 5287 uses 0xA8 as base */
273 WARN_ON(pdev->device != 0x5287);
274 pci_write_config_dword(pdev, 0xB0 + slot * 4, val);
275 return 0;
276
277 case SCR_CONTROL:
278 /* set the DET field */
279 v |= ((val & 0x4) >> 1) | (val & 0x1);
280
281 /* set the IPM field */
282 v |= ((val >> 8) & 0x3) << 2;
283
284 pci_write_config_byte(pdev, 0xA4 + slot, v);
285 return 0;
286
287 default:
288 return -EINVAL;
289 }
290 }
291
292 /**
293 * svia_tf_load - send taskfile registers to host controller
294 * @ap: Port to which output is sent
295 * @tf: ATA taskfile register set
296 *
297 * Outputs ATA taskfile to standard ATA host controller.
298 *
299 * This is to fix the internal bug of via chipsets, which will
300 * reset the device register after changing the IEN bit on ctl
301 * register.
302 */
303 static void svia_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
304 {
305 struct ata_taskfile ttf;
306
307 if (tf->ctl != ap->last_ctl) {
308 ttf = *tf;
309 ttf.flags |= ATA_TFLAG_DEVICE;
310 tf = &ttf;
311 }
312 ata_sff_tf_load(ap, tf);
313 }
314
315 static void svia_noop_freeze(struct ata_port *ap)
316 {
317 /* Some VIA controllers choke if ATA_NIEN is manipulated in
318 * certain way. Leave it alone and just clear pending IRQ.
319 */
320 ap->ops->sff_check_status(ap);
321 ata_bmdma_irq_clear(ap);
322 }
323
324 /**
325 * vt6420_prereset - prereset for vt6420
326 * @link: target ATA link
327 * @deadline: deadline jiffies for the operation
328 *
329 * SCR registers on vt6420 are pieces of shit and may hang the
330 * whole machine completely if accessed with the wrong timing.
331 * To avoid such catastrophe, vt6420 doesn't provide generic SCR
332 * access operations, but uses SStatus and SControl only during
333 * boot probing in controlled way.
334 *
335 * As the old (pre EH update) probing code is proven to work, we
336 * strictly follow the access pattern.
337 *
338 * LOCKING:
339 * Kernel thread context (may sleep)
340 *
341 * RETURNS:
342 * 0 on success, -errno otherwise.
343 */
344 static int vt6420_prereset(struct ata_link *link, unsigned long deadline)
345 {
346 struct ata_port *ap = link->ap;
347 struct ata_eh_context *ehc = &ap->link.eh_context;
348 unsigned long timeout = jiffies + (HZ * 5);
349 u32 sstatus, scontrol;
350 int online;
351
352 /* don't do any SCR stuff if we're not loading */
353 if (!(ap->pflags & ATA_PFLAG_LOADING))
354 goto skip_scr;
355
356 /* Resume phy. This is the old SATA resume sequence */
357 svia_scr_write(link, SCR_CONTROL, 0x300);
358 svia_scr_read(link, SCR_CONTROL, &scontrol); /* flush */
359
360 /* wait for phy to become ready, if necessary */
361 do {
362 ata_msleep(link->ap, 200);
363 svia_scr_read(link, SCR_STATUS, &sstatus);
364 if ((sstatus & 0xf) != 1)
365 break;
366 } while (time_before(jiffies, timeout));
367
368 /* open code sata_print_link_status() */
369 svia_scr_read(link, SCR_STATUS, &sstatus);
370 svia_scr_read(link, SCR_CONTROL, &scontrol);
371
372 online = (sstatus & 0xf) == 0x3;
373
374 ata_port_info(ap,
375 "SATA link %s 1.5 Gbps (SStatus %X SControl %X)\n",
376 online ? "up" : "down", sstatus, scontrol);
377
378 /* SStatus is read one more time */
379 svia_scr_read(link, SCR_STATUS, &sstatus);
380
381 if (!online) {
382 /* tell EH to bail */
383 ehc->i.action &= ~ATA_EH_RESET;
384 return 0;
385 }
386
387 skip_scr:
388 /* wait for !BSY */
389 ata_sff_wait_ready(link, deadline);
390
391 return 0;
392 }
393
394 static void vt6420_bmdma_start(struct ata_queued_cmd *qc)
395 {
396 struct ata_port *ap = qc->ap;
397 if ((qc->tf.command == ATA_CMD_PACKET) &&
398 (qc->scsicmd->sc_data_direction == DMA_TO_DEVICE)) {
399 /* Prevents corruption on some ATAPI burners */
400 ata_sff_pause(ap);
401 }
402 ata_bmdma_start(qc);
403 }
404
405 static int vt6421_pata_cable_detect(struct ata_port *ap)
406 {
407 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
408 u8 tmp;
409
410 pci_read_config_byte(pdev, PATA_UDMA_TIMING, &tmp);
411 if (tmp & 0x10)
412 return ATA_CBL_PATA40;
413 return ATA_CBL_PATA80;
414 }
415
416 static void vt6421_set_pio_mode(struct ata_port *ap, struct ata_device *adev)
417 {
418 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
419 static const u8 pio_bits[] = { 0xA8, 0x65, 0x65, 0x31, 0x20 };
420 pci_write_config_byte(pdev, PATA_PIO_TIMING - adev->devno,
421 pio_bits[adev->pio_mode - XFER_PIO_0]);
422 }
423
424 static void vt6421_set_dma_mode(struct ata_port *ap, struct ata_device *adev)
425 {
426 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
427 static const u8 udma_bits[] = { 0xEE, 0xE8, 0xE6, 0xE4, 0xE2, 0xE1, 0xE0, 0xE0 };
428 pci_write_config_byte(pdev, PATA_UDMA_TIMING - adev->devno,
429 udma_bits[adev->dma_mode - XFER_UDMA_0]);
430 }
431
432 static const unsigned int svia_bar_sizes[] = {
433 8, 4, 8, 4, 16, 256
434 };
435
436 static const unsigned int vt6421_bar_sizes[] = {
437 16, 16, 16, 16, 32, 128
438 };
439
440 static void __iomem *svia_scr_addr(void __iomem *addr, unsigned int port)
441 {
442 return addr + (port * 128);
443 }
444
445 static void __iomem *vt6421_scr_addr(void __iomem *addr, unsigned int port)
446 {
447 return addr + (port * 64);
448 }
449
450 static void vt6421_init_addrs(struct ata_port *ap)
451 {
452 void __iomem * const * iomap = ap->host->iomap;
453 void __iomem *reg_addr = iomap[ap->port_no];
454 void __iomem *bmdma_addr = iomap[4] + (ap->port_no * 8);
455 struct ata_ioports *ioaddr = &ap->ioaddr;
456
457 ioaddr->cmd_addr = reg_addr;
458 ioaddr->altstatus_addr =
459 ioaddr->ctl_addr = (void __iomem *)
460 ((unsigned long)(reg_addr + 8) | ATA_PCI_CTL_OFS);
461 ioaddr->bmdma_addr = bmdma_addr;
462 ioaddr->scr_addr = vt6421_scr_addr(iomap[5], ap->port_no);
463
464 ata_sff_std_ports(ioaddr);
465
466 ata_port_pbar_desc(ap, ap->port_no, -1, "port");
467 ata_port_pbar_desc(ap, 4, ap->port_no * 8, "bmdma");
468 }
469
470 static int vt6420_prepare_host(struct pci_dev *pdev, struct ata_host **r_host)
471 {
472 const struct ata_port_info *ppi[] = { &vt6420_port_info, NULL };
473 struct ata_host *host;
474 int rc;
475
476 rc = ata_pci_bmdma_prepare_host(pdev, ppi, &host);
477 if (rc)
478 return rc;
479 *r_host = host;
480
481 rc = pcim_iomap_regions(pdev, 1 << 5, DRV_NAME);
482 if (rc) {
483 dev_err(&pdev->dev, "failed to iomap PCI BAR 5\n");
484 return rc;
485 }
486
487 host->ports[0]->ioaddr.scr_addr = svia_scr_addr(host->iomap[5], 0);
488 host->ports[1]->ioaddr.scr_addr = svia_scr_addr(host->iomap[5], 1);
489
490 return 0;
491 }
492
493 static int vt6421_prepare_host(struct pci_dev *pdev, struct ata_host **r_host)
494 {
495 const struct ata_port_info *ppi[] =
496 { &vt6421_sport_info, &vt6421_sport_info, &vt6421_pport_info };
497 struct ata_host *host;
498 int i, rc;
499
500 *r_host = host = ata_host_alloc_pinfo(&pdev->dev, ppi, ARRAY_SIZE(ppi));
501 if (!host) {
502 dev_err(&pdev->dev, "failed to allocate host\n");
503 return -ENOMEM;
504 }
505
506 rc = pcim_iomap_regions(pdev, 0x3f, DRV_NAME);
507 if (rc) {
508 dev_err(&pdev->dev, "failed to request/iomap PCI BARs (errno=%d)\n",
509 rc);
510 return rc;
511 }
512 host->iomap = pcim_iomap_table(pdev);
513
514 for (i = 0; i < host->n_ports; i++)
515 vt6421_init_addrs(host->ports[i]);
516
517 rc = dma_set_mask(&pdev->dev, ATA_DMA_MASK);
518 if (rc)
519 return rc;
520 rc = dma_set_coherent_mask(&pdev->dev, ATA_DMA_MASK);
521 if (rc)
522 return rc;
523
524 return 0;
525 }
526
527 static int vt8251_prepare_host(struct pci_dev *pdev, struct ata_host **r_host)
528 {
529 const struct ata_port_info *ppi[] = { &vt8251_port_info, NULL };
530 struct ata_host *host;
531 int i, rc;
532
533 rc = ata_pci_bmdma_prepare_host(pdev, ppi, &host);
534 if (rc)
535 return rc;
536 *r_host = host;
537
538 rc = pcim_iomap_regions(pdev, 1 << 5, DRV_NAME);
539 if (rc) {
540 dev_err(&pdev->dev, "failed to iomap PCI BAR 5\n");
541 return rc;
542 }
543
544 /* 8251 hosts four sata ports as M/S of the two channels */
545 for (i = 0; i < host->n_ports; i++)
546 ata_slave_link_init(host->ports[i]);
547
548 return 0;
549 }
550
551 static void svia_wd_fix(struct pci_dev *pdev)
552 {
553 u8 tmp8;
554
555 pci_read_config_byte(pdev, 0x52, &tmp8);
556 pci_write_config_byte(pdev, 0x52, tmp8 | BIT(2));
557 }
558
559 static irqreturn_t vt6421_interrupt(int irq, void *dev_instance)
560 {
561 struct ata_host *host = dev_instance;
562 irqreturn_t rc = ata_bmdma_interrupt(irq, dev_instance);
563
564 /* if the IRQ was not handled, it might be a hotplug IRQ */
565 if (rc != IRQ_HANDLED) {
566 u32 serror;
567 unsigned long flags;
568
569 spin_lock_irqsave(&host->lock, flags);
570 /* check for hotplug on port 0 */
571 svia_scr_read(&host->ports[0]->link, SCR_ERROR, &serror);
572 if (serror & SERR_PHYRDY_CHG) {
573 ata_ehi_hotplugged(&host->ports[0]->link.eh_info);
574 ata_port_freeze(host->ports[0]);
575 rc = IRQ_HANDLED;
576 }
577 /* check for hotplug on port 1 */
578 svia_scr_read(&host->ports[1]->link, SCR_ERROR, &serror);
579 if (serror & SERR_PHYRDY_CHG) {
580 ata_ehi_hotplugged(&host->ports[1]->link.eh_info);
581 ata_port_freeze(host->ports[1]);
582 rc = IRQ_HANDLED;
583 }
584 spin_unlock_irqrestore(&host->lock, flags);
585 }
586
587 return rc;
588 }
589
590 static void vt6421_error_handler(struct ata_port *ap)
591 {
592 struct svia_priv *hpriv = ap->host->private_data;
593 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
594 u32 serror;
595
596 /* see svia_configure() for description */
597 if (!hpriv->wd_workaround) {
598 svia_scr_read(&ap->link, SCR_ERROR, &serror);
599 if (serror == 0x1000500) {
600 ata_port_warn(ap, "Incompatible drive: enabling workaround. This slows down transfer rate to ~60 MB/s");
601 svia_wd_fix(pdev);
602 hpriv->wd_workaround = true;
603 ap->link.eh_context.i.flags |= ATA_EHI_QUIET;
604 }
605 }
606
607 ata_sff_error_handler(ap);
608 }
609
610 static void svia_configure(struct pci_dev *pdev, int board_id,
611 struct svia_priv *hpriv)
612 {
613 u8 tmp8;
614
615 pci_read_config_byte(pdev, PCI_INTERRUPT_LINE, &tmp8);
616 dev_info(&pdev->dev, "routed to hard irq line %d\n",
617 (int) (tmp8 & 0xf0) == 0xf0 ? 0 : tmp8 & 0x0f);
618
619 /* make sure SATA channels are enabled */
620 pci_read_config_byte(pdev, SATA_CHAN_ENAB, &tmp8);
621 if ((tmp8 & ALL_PORTS) != ALL_PORTS) {
622 dev_dbg(&pdev->dev, "enabling SATA channels (0x%x)\n",
623 (int)tmp8);
624 tmp8 |= ALL_PORTS;
625 pci_write_config_byte(pdev, SATA_CHAN_ENAB, tmp8);
626 }
627
628 /* make sure interrupts for each channel sent to us */
629 pci_read_config_byte(pdev, SATA_INT_GATE, &tmp8);
630 if ((tmp8 & ALL_PORTS) != ALL_PORTS) {
631 dev_dbg(&pdev->dev, "enabling SATA channel interrupts (0x%x)\n",
632 (int) tmp8);
633 tmp8 |= ALL_PORTS;
634 pci_write_config_byte(pdev, SATA_INT_GATE, tmp8);
635 }
636
637 /* make sure native mode is enabled */
638 pci_read_config_byte(pdev, SATA_NATIVE_MODE, &tmp8);
639 if ((tmp8 & NATIVE_MODE_ALL) != NATIVE_MODE_ALL) {
640 dev_dbg(&pdev->dev,
641 "enabling SATA channel native mode (0x%x)\n",
642 (int) tmp8);
643 tmp8 |= NATIVE_MODE_ALL;
644 pci_write_config_byte(pdev, SATA_NATIVE_MODE, tmp8);
645 }
646
647 if (board_id == vt6421) {
648 /* enable IRQ on hotplug */
649 pci_read_config_byte(pdev, SVIA_MISC_3, &tmp8);
650 if ((tmp8 & SATA_HOTPLUG) != SATA_HOTPLUG) {
651 dev_dbg(&pdev->dev,
652 "enabling SATA hotplug (0x%x)\n",
653 (int) tmp8);
654 tmp8 |= SATA_HOTPLUG;
655 pci_write_config_byte(pdev, SVIA_MISC_3, tmp8);
656 }
657 }
658
659 /*
660 * vt6420/1 has problems talking to some drives. The following
661 * is the fix from Joseph Chan <JosephChan@via.com.tw>.
662 *
663 * When host issues HOLD, device may send up to 20DW of data
664 * before acknowledging it with HOLDA and the host should be
665 * able to buffer them in FIFO. Unfortunately, some WD drives
666 * send up to 40DW before acknowledging HOLD and, in the
667 * default configuration, this ends up overflowing vt6421's
668 * FIFO, making the controller abort the transaction with
669 * R_ERR.
670 *
671 * Rx52[2] is the internal 128DW FIFO Flow control watermark
672 * adjusting mechanism enable bit and the default value 0
673 * means host will issue HOLD to device when the left FIFO
674 * size goes below 32DW. Setting it to 1 makes the watermark
675 * 64DW.
676 *
677 * https://bugzilla.kernel.org/show_bug.cgi?id=15173
678 * http://article.gmane.org/gmane.linux.ide/46352
679 * http://thread.gmane.org/gmane.linux.kernel/1062139
680 *
681 * As the fix slows down data transfer, apply it only if the error
682 * actually appears - see vt6421_error_handler()
683 * Apply the fix always on vt6420 as we don't know if SCR_ERROR can be
684 * read safely.
685 */
686 if (board_id == vt6420) {
687 svia_wd_fix(pdev);
688 hpriv->wd_workaround = true;
689 }
690 }
691
692 static int svia_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
693 {
694 unsigned int i;
695 int rc;
696 struct ata_host *host = NULL;
697 int board_id = (int) ent->driver_data;
698 const unsigned *bar_sizes;
699 struct svia_priv *hpriv;
700
701 ata_print_version_once(&pdev->dev, DRV_VERSION);
702
703 rc = pcim_enable_device(pdev);
704 if (rc)
705 return rc;
706
707 if (board_id == vt6421)
708 bar_sizes = &vt6421_bar_sizes[0];
709 else
710 bar_sizes = &svia_bar_sizes[0];
711
712 for (i = 0; i < ARRAY_SIZE(svia_bar_sizes); i++)
713 if ((pci_resource_start(pdev, i) == 0) ||
714 (pci_resource_len(pdev, i) < bar_sizes[i])) {
715 dev_err(&pdev->dev,
716 "invalid PCI BAR %u (sz 0x%llx, val 0x%llx)\n",
717 i,
718 (unsigned long long)pci_resource_start(pdev, i),
719 (unsigned long long)pci_resource_len(pdev, i));
720 return -ENODEV;
721 }
722
723 switch (board_id) {
724 case vt6420:
725 rc = vt6420_prepare_host(pdev, &host);
726 break;
727 case vt6421:
728 rc = vt6421_prepare_host(pdev, &host);
729 break;
730 case vt8251:
731 rc = vt8251_prepare_host(pdev, &host);
732 break;
733 default:
734 rc = -EINVAL;
735 }
736 if (rc)
737 return rc;
738
739 hpriv = devm_kzalloc(&pdev->dev, sizeof(*hpriv), GFP_KERNEL);
740 if (!hpriv)
741 return -ENOMEM;
742 host->private_data = hpriv;
743
744 svia_configure(pdev, board_id, hpriv);
745
746 pci_set_master(pdev);
747 if (board_id == vt6421)
748 return ata_host_activate(host, pdev->irq, vt6421_interrupt,
749 IRQF_SHARED, &svia_sht);
750 else
751 return ata_host_activate(host, pdev->irq, ata_bmdma_interrupt,
752 IRQF_SHARED, &svia_sht);
753 }
754
755 #ifdef CONFIG_PM_SLEEP
756 static int svia_pci_device_resume(struct pci_dev *pdev)
757 {
758 struct ata_host *host = pci_get_drvdata(pdev);
759 struct svia_priv *hpriv = host->private_data;
760 int rc;
761
762 rc = ata_pci_device_do_resume(pdev);
763 if (rc)
764 return rc;
765
766 if (hpriv->wd_workaround)
767 svia_wd_fix(pdev);
768 ata_host_resume(host);
769
770 return 0;
771 }
772 #endif
773
774 module_pci_driver(svia_pci_driver);
Linux with added FPC-III support