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Now it works.
[cbs-scheduler.git] / drivers / ata / pata_via.c
blobba556d3e696368ecea761e4440f82434695318f9
1 /*
2 * pata_via.c - VIA PATA for new ATA layer
3 * (C) 2005-2006 Red Hat Inc
4 *
5 * Documentation
6 * Most chipset documentation available under NDA only
7 *
8 * VIA version guide
9 * VIA VT82C561 - early design, uses ata_generic currently
10 * VIA VT82C576 - MWDMA, 33Mhz
11 * VIA VT82C586 - MWDMA, 33Mhz
12 * VIA VT82C586a - Added UDMA to 33Mhz
13 * VIA VT82C586b - UDMA33
14 * VIA VT82C596a - Nonfunctional UDMA66
15 * VIA VT82C596b - Working UDMA66
16 * VIA VT82C686 - Nonfunctional UDMA66
17 * VIA VT82C686a - Working UDMA66
18 * VIA VT82C686b - Updated to UDMA100
19 * VIA VT8231 - UDMA100
20 * VIA VT8233 - UDMA100
21 * VIA VT8233a - UDMA133
22 * VIA VT8233c - UDMA100
23 * VIA VT8235 - UDMA133
24 * VIA VT8237 - UDMA133
25 * VIA VT8237S - UDMA133
26 * VIA VT8251 - UDMA133
27 *
28 * Most registers remain compatible across chips. Others start reserved
29 * and acquire sensible semantics if set to 1 (eg cable detect). A few
30 * exceptions exist, notably around the FIFO settings.
31 *
32 * One additional quirk of the VIA design is that like ALi they use few
33 * PCI IDs for a lot of chips.
34 *
35 * Based heavily on:
36 *
37 * Version 3.38
38 *
39 * VIA IDE driver for Linux. Supported southbridges:
40 *
41 * vt82c576, vt82c586, vt82c586a, vt82c586b, vt82c596a, vt82c596b,
42 * vt82c686, vt82c686a, vt82c686b, vt8231, vt8233, vt8233c, vt8233a,
43 * vt8235, vt8237
44 *
45 * Copyright (c) 2000-2002 Vojtech Pavlik
46 *
47 * Based on the work of:
48 * Michel Aubry
49 * Jeff Garzik
50 * Andre Hedrick
51
52 */
53
54 #include <linux/kernel.h>
55 #include <linux/module.h>
56 #include <linux/pci.h>
57 #include <linux/init.h>
58 #include <linux/blkdev.h>
59 #include <linux/delay.h>
60 #include <scsi/scsi_host.h>
61 #include <linux/libata.h>
62 #include <linux/dmi.h>
63
64 #define DRV_NAME "pata_via"
65 #define DRV_VERSION "0.3.3"
66
67 /*
68 * The following comes directly from Vojtech Pavlik's ide/pci/via82cxxx
69 * driver.
70 */
71
72 enum {
73 VIA_UDMA = 0x007,
74 VIA_UDMA_NONE = 0x000,
75 VIA_UDMA_33 = 0x001,
76 VIA_UDMA_66 = 0x002,
77 VIA_UDMA_100 = 0x003,
78 VIA_UDMA_133 = 0x004,
79 VIA_BAD_PREQ = 0x010, /* Crashes if PREQ# till DDACK# set */
80 VIA_BAD_CLK66 = 0x020, /* 66 MHz clock doesn't work correctly */
81 VIA_SET_FIFO = 0x040, /* Needs to have FIFO split set */
82 VIA_NO_UNMASK = 0x080, /* Doesn't work with IRQ unmasking on */
83 VIA_BAD_ID = 0x100, /* Has wrong vendor ID (0x1107) */
84 VIA_BAD_AST = 0x200, /* Don't touch Address Setup Timing */
85 VIA_NO_ENABLES = 0x400, /* Has no enablebits */
86 VIA_SATA_PATA = 0x800, /* SATA/PATA combined configuration */
87 };
88
89 enum {
90 VIA_IDFLAG_SINGLE = (1 << 0), /* single channel controller) */
91 };
92
93 /*
94 * VIA SouthBridge chips.
95 */
96
97 static const struct via_isa_bridge {
98 const char *name;
99 u16 id;
100 u8 rev_min;
101 u8 rev_max;
102 u16 flags;
103 } via_isa_bridges[] = {
104 { "vx855", PCI_DEVICE_ID_VIA_VX855, 0x00, 0x2f,
105 VIA_UDMA_133 | VIA_BAD_AST | VIA_SATA_PATA },
106 { "vx800", PCI_DEVICE_ID_VIA_VX800, 0x00, 0x2f, VIA_UDMA_133 |
107 VIA_BAD_AST | VIA_SATA_PATA },
108 { "vt8261", PCI_DEVICE_ID_VIA_8261, 0x00, 0x2f,
109 VIA_UDMA_133 | VIA_BAD_AST },
110 { "vt8237s", PCI_DEVICE_ID_VIA_8237S, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
111 { "vt8251", PCI_DEVICE_ID_VIA_8251, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
112 { "cx700", PCI_DEVICE_ID_VIA_CX700, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST | VIA_SATA_PATA },
113 { "vt6410", PCI_DEVICE_ID_VIA_6410, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST | VIA_NO_ENABLES },
114 { "vt6415", PCI_DEVICE_ID_VIA_6415, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST | VIA_NO_ENABLES },
115 { "vt8237a", PCI_DEVICE_ID_VIA_8237A, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
116 { "vt8237", PCI_DEVICE_ID_VIA_8237, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
117 { "vt8235", PCI_DEVICE_ID_VIA_8235, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
118 { "vt8233a", PCI_DEVICE_ID_VIA_8233A, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
119 { "vt8233c", PCI_DEVICE_ID_VIA_8233C_0, 0x00, 0x2f, VIA_UDMA_100 },
120 { "vt8233", PCI_DEVICE_ID_VIA_8233_0, 0x00, 0x2f, VIA_UDMA_100 },
121 { "vt8231", PCI_DEVICE_ID_VIA_8231, 0x00, 0x2f, VIA_UDMA_100 },
122 { "vt82c686b", PCI_DEVICE_ID_VIA_82C686, 0x40, 0x4f, VIA_UDMA_100 },
123 { "vt82c686a", PCI_DEVICE_ID_VIA_82C686, 0x10, 0x2f, VIA_UDMA_66 },
124 { "vt82c686", PCI_DEVICE_ID_VIA_82C686, 0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
125 { "vt82c596b", PCI_DEVICE_ID_VIA_82C596, 0x10, 0x2f, VIA_UDMA_66 },
126 { "vt82c596a", PCI_DEVICE_ID_VIA_82C596, 0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
127 { "vt82c586b", PCI_DEVICE_ID_VIA_82C586_0, 0x47, 0x4f, VIA_UDMA_33 | VIA_SET_FIFO },
128 { "vt82c586b", PCI_DEVICE_ID_VIA_82C586_0, 0x40, 0x46, VIA_UDMA_33 | VIA_SET_FIFO | VIA_BAD_PREQ },
129 { "vt82c586b", PCI_DEVICE_ID_VIA_82C586_0, 0x30, 0x3f, VIA_UDMA_33 | VIA_SET_FIFO },
130 { "vt82c586a", PCI_DEVICE_ID_VIA_82C586_0, 0x20, 0x2f, VIA_UDMA_33 | VIA_SET_FIFO },
131 { "vt82c586", PCI_DEVICE_ID_VIA_82C586_0, 0x00, 0x0f, VIA_UDMA_NONE | VIA_SET_FIFO },
132 { "vt82c576", PCI_DEVICE_ID_VIA_82C576, 0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK },
133 { "vt82c576", PCI_DEVICE_ID_VIA_82C576, 0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK | VIA_BAD_ID },
134 { "vtxxxx", PCI_DEVICE_ID_VIA_ANON, 0x00, 0x2f,
135 VIA_UDMA_133 | VIA_BAD_AST },
136 { NULL }
137 };
138
139
140 /*
141 * Cable special cases
142 */
143
144 static const struct dmi_system_id cable_dmi_table[] = {
145 {
146 .ident = "Acer Ferrari 3400",
147 .matches = {
148 DMI_MATCH(DMI_BOARD_VENDOR, "Acer,Inc."),
149 DMI_MATCH(DMI_BOARD_NAME, "Ferrari 3400"),
150 },
151 },
152 { }
153 };
154
155 static int via_cable_override(struct pci_dev *pdev)
156 {
157 /* Systems by DMI */
158 if (dmi_check_system(cable_dmi_table))
159 return 1;
160 /* Arima W730-K8/Targa Visionary 811/... */
161 if (pdev->subsystem_vendor == 0x161F && pdev->subsystem_device == 0x2032)
162 return 1;
163 return 0;
164 }
165
166
167 /**
168 * via_cable_detect - cable detection
169 * @ap: ATA port
170 *
171 * Perform cable detection. Actually for the VIA case the BIOS
172 * already did this for us. We read the values provided by the
173 * BIOS. If you are using an 8235 in a non-PC configuration you
174 * may need to update this code.
175 *
176 * Hotplug also impacts on this.
177 */
178
179 static int via_cable_detect(struct ata_port *ap) {
180 const struct via_isa_bridge *config = ap->host->private_data;
181 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
182 u32 ata66;
183
184 if (via_cable_override(pdev))
185 return ATA_CBL_PATA40_SHORT;
186
187 if ((config->flags & VIA_SATA_PATA) && ap->port_no == 0)
188 return ATA_CBL_SATA;
189
190 /* Early chips are 40 wire */
191 if ((config->flags & VIA_UDMA) < VIA_UDMA_66)
192 return ATA_CBL_PATA40;
193 /* UDMA 66 chips have only drive side logic */
194 else if ((config->flags & VIA_UDMA) < VIA_UDMA_100)
195 return ATA_CBL_PATA_UNK;
196 /* UDMA 100 or later */
197 pci_read_config_dword(pdev, 0x50, &ata66);
198 /* Check both the drive cable reporting bits, we might not have
199 two drives */
200 if (ata66 & (0x10100000 >> (16 * ap->port_no)))
201 return ATA_CBL_PATA80;
202 /* Check with ACPI so we can spot BIOS reported SATA bridges */
203 if (ata_acpi_init_gtm(ap) &&
204 ata_acpi_cbl_80wire(ap, ata_acpi_init_gtm(ap)))
205 return ATA_CBL_PATA80;
206 return ATA_CBL_PATA40;
207 }
208
209 static int via_pre_reset(struct ata_link *link, unsigned long deadline)
210 {
211 struct ata_port *ap = link->ap;
212 const struct via_isa_bridge *config = ap->host->private_data;
213
214 if (!(config->flags & VIA_NO_ENABLES)) {
215 static const struct pci_bits via_enable_bits[] = {
216 { 0x40, 1, 0x02, 0x02 },
217 { 0x40, 1, 0x01, 0x01 }
218 };
219 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
220 if (!pci_test_config_bits(pdev, &via_enable_bits[ap->port_no]))
221 return -ENOENT;
222 }
223
224 return ata_sff_prereset(link, deadline);
225 }
226
227
228 /**
229 * via_do_set_mode - set initial PIO mode data
230 * @ap: ATA interface
231 * @adev: ATA device
232 * @mode: ATA mode being programmed
233 * @tdiv: Clocks per PCI clock
234 * @set_ast: Set to program address setup
235 * @udma_type: UDMA mode/format of registers
236 *
237 * Program the VIA registers for DMA and PIO modes. Uses the ata timing
238 * support in order to compute modes.
239 *
240 * FIXME: Hotplug will require we serialize multiple mode changes
241 * on the two channels.
242 */
243
244 static void via_do_set_mode(struct ata_port *ap, struct ata_device *adev, int mode, int tdiv, int set_ast, int udma_type)
245 {
246 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
247 struct ata_device *peer = ata_dev_pair(adev);
248 struct ata_timing t, p;
249 static int via_clock = 33333; /* Bus clock in kHZ - ought to be tunable one day */
250 unsigned long T = 1000000000 / via_clock;
251 unsigned long UT = T/tdiv;
252 int ut;
253 int offset = 3 - (2*ap->port_no) - adev->devno;
254
255 /* Calculate the timing values we require */
256 ata_timing_compute(adev, mode, &t, T, UT);
257
258 /* We share 8bit timing so we must merge the constraints */
259 if (peer) {
260 if (peer->pio_mode) {
261 ata_timing_compute(peer, peer->pio_mode, &p, T, UT);
262 ata_timing_merge(&p, &t, &t, ATA_TIMING_8BIT);
263 }
264 }
265
266 /* Address setup is programmable but breaks on UDMA133 setups */
267 if (set_ast) {
268 u8 setup; /* 2 bits per drive */
269 int shift = 2 * offset;
270
271 pci_read_config_byte(pdev, 0x4C, &setup);
272 setup &= ~(3 << shift);
273 setup |= clamp_val(t.setup, 1, 4) << shift; /* 1,4 or 1,4 - 1 FIXME */
274 pci_write_config_byte(pdev, 0x4C, setup);
275 }
276
277 /* Load the PIO mode bits */
278 pci_write_config_byte(pdev, 0x4F - ap->port_no,
279 ((clamp_val(t.act8b, 1, 16) - 1) << 4) | (clamp_val(t.rec8b, 1, 16) - 1));
280 pci_write_config_byte(pdev, 0x48 + offset,
281 ((clamp_val(t.active, 1, 16) - 1) << 4) | (clamp_val(t.recover, 1, 16) - 1));
282
283 /* Load the UDMA bits according to type */
284 switch(udma_type) {
285 default:
286 /* BUG() ? */
287 /* fall through */
288 case 33:
289 ut = t.udma ? (0xe0 | (clamp_val(t.udma, 2, 5) - 2)) : 0x03;
290 break;
291 case 66:
292 ut = t.udma ? (0xe8 | (clamp_val(t.udma, 2, 9) - 2)) : 0x0f;
293 break;
294 case 100:
295 ut = t.udma ? (0xe0 | (clamp_val(t.udma, 2, 9) - 2)) : 0x07;
296 break;
297 case 133:
298 ut = t.udma ? (0xe0 | (clamp_val(t.udma, 2, 9) - 2)) : 0x07;
299 break;
300 }
301
302 /* Set UDMA unless device is not UDMA capable */
303 if (udma_type && t.udma) {
304 u8 cable80_status;
305
306 /* Get 80-wire cable detection bit */
307 pci_read_config_byte(pdev, 0x50 + offset, &cable80_status);
308 cable80_status &= 0x10;
309
310 pci_write_config_byte(pdev, 0x50 + offset, ut | cable80_status);
311 }
312 }
313
314 static void via_set_piomode(struct ata_port *ap, struct ata_device *adev)
315 {
316 const struct via_isa_bridge *config = ap->host->private_data;
317 int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
318 int mode = config->flags & VIA_UDMA;
319 static u8 tclock[5] = { 1, 1, 2, 3, 4 };
320 static u8 udma[5] = { 0, 33, 66, 100, 133 };
321
322 via_do_set_mode(ap, adev, adev->pio_mode, tclock[mode], set_ast, udma[mode]);
323 }
324
325 static void via_set_dmamode(struct ata_port *ap, struct ata_device *adev)
326 {
327 const struct via_isa_bridge *config = ap->host->private_data;
328 int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
329 int mode = config->flags & VIA_UDMA;
330 static u8 tclock[5] = { 1, 1, 2, 3, 4 };
331 static u8 udma[5] = { 0, 33, 66, 100, 133 };
332
333 via_do_set_mode(ap, adev, adev->dma_mode, tclock[mode], set_ast, udma[mode]);
334 }
335
336 /**
337 * via_tf_load - send taskfile registers to host controller
338 * @ap: Port to which output is sent
339 * @tf: ATA taskfile register set
340 *
341 * Outputs ATA taskfile to standard ATA host controller.
342 *
343 * Note: This is to fix the internal bug of via chipsets, which
344 * will reset the device register after changing the IEN bit on
345 * ctl register
346 */
347 static void via_tf_load(struct ata_port *ap, const struct ata_taskfile *tf)
348 {
349 struct ata_taskfile tmp_tf;
350
351 if (ap->ctl != ap->last_ctl && !(tf->flags & ATA_TFLAG_DEVICE)) {
352 tmp_tf = *tf;
353 tmp_tf.flags |= ATA_TFLAG_DEVICE;
354 tf = &tmp_tf;
355 }
356 ata_sff_tf_load(ap, tf);
357 }
358
359 static struct scsi_host_template via_sht = {
360 ATA_BMDMA_SHT(DRV_NAME),
361 };
362
363 static struct ata_port_operations via_port_ops = {
364 .inherits = &ata_bmdma_port_ops,
365 .cable_detect = via_cable_detect,
366 .set_piomode = via_set_piomode,
367 .set_dmamode = via_set_dmamode,
368 .prereset = via_pre_reset,
369 .sff_tf_load = via_tf_load,
370 };
371
372 static struct ata_port_operations via_port_ops_noirq = {
373 .inherits = &via_port_ops,
374 .sff_data_xfer = ata_sff_data_xfer_noirq,
375 };
376
377 /**
378 * via_config_fifo - set up the FIFO
379 * @pdev: PCI device
380 * @flags: configuration flags
381 *
382 * Set the FIFO properties for this device if necessary. Used both on
383 * set up and on and the resume path
384 */
385
386 static void via_config_fifo(struct pci_dev *pdev, unsigned int flags)
387 {
388 u8 enable;
389
390 /* 0x40 low bits indicate enabled channels */
391 pci_read_config_byte(pdev, 0x40 , &enable);
392 enable &= 3;
393
394 if (flags & VIA_SET_FIFO) {
395 static const u8 fifo_setting[4] = {0x00, 0x60, 0x00, 0x20};
396 u8 fifo;
397
398 pci_read_config_byte(pdev, 0x43, &fifo);
399
400 /* Clear PREQ# until DDACK# for errata */
401 if (flags & VIA_BAD_PREQ)
402 fifo &= 0x7F;
403 else
404 fifo &= 0x9f;
405 /* Turn on FIFO for enabled channels */
406 fifo |= fifo_setting[enable];
407 pci_write_config_byte(pdev, 0x43, fifo);
408 }
409 }
410
411 /**
412 * via_init_one - discovery callback
413 * @pdev: PCI device
414 * @id: PCI table info
415 *
416 * A VIA IDE interface has been discovered. Figure out what revision
417 * and perform configuration work before handing it to the ATA layer
418 */
419
420 static int via_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
421 {
422 /* Early VIA without UDMA support */
423 static const struct ata_port_info via_mwdma_info = {
424 .flags = ATA_FLAG_SLAVE_POSS,
425 .pio_mask = 0x1f,
426 .mwdma_mask = 0x07,
427 .port_ops = &via_port_ops
428 };
429 /* Ditto with IRQ masking required */
430 static const struct ata_port_info via_mwdma_info_borked = {
431 .flags = ATA_FLAG_SLAVE_POSS,
432 .pio_mask = 0x1f,
433 .mwdma_mask = 0x07,
434 .port_ops = &via_port_ops_noirq,
435 };
436 /* VIA UDMA 33 devices (and borked 66) */
437 static const struct ata_port_info via_udma33_info = {
438 .flags = ATA_FLAG_SLAVE_POSS,
439 .pio_mask = 0x1f,
440 .mwdma_mask = 0x07,
441 .udma_mask = ATA_UDMA2,
442 .port_ops = &via_port_ops
443 };
444 /* VIA UDMA 66 devices */
445 static const struct ata_port_info via_udma66_info = {
446 .flags = ATA_FLAG_SLAVE_POSS,
447 .pio_mask = 0x1f,
448 .mwdma_mask = 0x07,
449 .udma_mask = ATA_UDMA4,
450 .port_ops = &via_port_ops
451 };
452 /* VIA UDMA 100 devices */
453 static const struct ata_port_info via_udma100_info = {
454 .flags = ATA_FLAG_SLAVE_POSS,
455 .pio_mask = 0x1f,
456 .mwdma_mask = 0x07,
457 .udma_mask = ATA_UDMA5,
458 .port_ops = &via_port_ops
459 };
460 /* UDMA133 with bad AST (All current 133) */
461 static const struct ata_port_info via_udma133_info = {
462 .flags = ATA_FLAG_SLAVE_POSS,
463 .pio_mask = 0x1f,
464 .mwdma_mask = 0x07,
465 .udma_mask = ATA_UDMA6, /* FIXME: should check north bridge */
466 .port_ops = &via_port_ops
467 };
468 const struct ata_port_info *ppi[] = { NULL, NULL };
469 struct pci_dev *isa = NULL;
470 const struct via_isa_bridge *config;
471 static int printed_version;
472 u8 enable;
473 u32 timing;
474 unsigned long flags = id->driver_data;
475 int rc;
476
477 if (!printed_version++)
478 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
479
480 rc = pcim_enable_device(pdev);
481 if (rc)
482 return rc;
483
484 if (flags & VIA_IDFLAG_SINGLE)
485 ppi[1] = &ata_dummy_port_info;
486
487 /* To find out how the IDE will behave and what features we
488 actually have to look at the bridge not the IDE controller */
489 for (config = via_isa_bridges; config->id != PCI_DEVICE_ID_VIA_ANON;
490 config++)
491 if ((isa = pci_get_device(PCI_VENDOR_ID_VIA +
492 !!(config->flags & VIA_BAD_ID),
493 config->id, NULL))) {
494
495 if (isa->revision >= config->rev_min &&
496 isa->revision <= config->rev_max)
497 break;
498 pci_dev_put(isa);
499 }
500
501 pci_dev_put(isa);
502
503 if (!(config->flags & VIA_NO_ENABLES)) {
504 /* 0x40 low bits indicate enabled channels */
505 pci_read_config_byte(pdev, 0x40 , &enable);
506 enable &= 3;
507 if (enable == 0)
508 return -ENODEV;
509 }
510
511 /* Initialise the FIFO for the enabled channels. */
512 via_config_fifo(pdev, config->flags);
513
514 /* Clock set up */
515 switch(config->flags & VIA_UDMA) {
516 case VIA_UDMA_NONE:
517 if (config->flags & VIA_NO_UNMASK)
518 ppi[0] = &via_mwdma_info_borked;
519 else
520 ppi[0] = &via_mwdma_info;
521 break;
522 case VIA_UDMA_33:
523 ppi[0] = &via_udma33_info;
524 break;
525 case VIA_UDMA_66:
526 ppi[0] = &via_udma66_info;
527 /* The 66 MHz devices require we enable the clock */
528 pci_read_config_dword(pdev, 0x50, &timing);
529 timing |= 0x80008;
530 pci_write_config_dword(pdev, 0x50, timing);
531 break;
532 case VIA_UDMA_100:
533 ppi[0] = &via_udma100_info;
534 break;
535 case VIA_UDMA_133:
536 ppi[0] = &via_udma133_info;
537 break;
538 default:
539 WARN_ON(1);
540 return -ENODEV;
541 }
542
543 if (config->flags & VIA_BAD_CLK66) {
544 /* Disable the 66MHz clock on problem devices */
545 pci_read_config_dword(pdev, 0x50, &timing);
546 timing &= ~0x80008;
547 pci_write_config_dword(pdev, 0x50, timing);
548 }
549
550 /* We have established the device type, now fire it up */
551 return ata_pci_sff_init_one(pdev, ppi, &via_sht, (void *)config);
552 }
553
554 #ifdef CONFIG_PM
555 /**
556 * via_reinit_one - reinit after resume
557 * @pdev; PCI device
558 *
559 * Called when the VIA PATA device is resumed. We must then
560 * reconfigure the fifo and other setup we may have altered. In
561 * addition the kernel needs to have the resume methods on PCI
562 * quirk supported.
563 */
564
565 static int via_reinit_one(struct pci_dev *pdev)
566 {
567 u32 timing;
568 struct ata_host *host = dev_get_drvdata(&pdev->dev);
569 const struct via_isa_bridge *config = host->private_data;
570 int rc;
571
572 rc = ata_pci_device_do_resume(pdev);
573 if (rc)
574 return rc;
575
576 via_config_fifo(pdev, config->flags);
577
578 if ((config->flags & VIA_UDMA) == VIA_UDMA_66) {
579 /* The 66 MHz devices require we enable the clock */
580 pci_read_config_dword(pdev, 0x50, &timing);
581 timing |= 0x80008;
582 pci_write_config_dword(pdev, 0x50, timing);
583 }
584 if (config->flags & VIA_BAD_CLK66) {
585 /* Disable the 66MHz clock on problem devices */
586 pci_read_config_dword(pdev, 0x50, &timing);
587 timing &= ~0x80008;
588 pci_write_config_dword(pdev, 0x50, timing);
589 }
590
591 ata_host_resume(host);
592 return 0;
593 }
594 #endif
595
596 static const struct pci_device_id via[] = {
597 { PCI_VDEVICE(VIA, 0x0415), },
598 { PCI_VDEVICE(VIA, 0x0571), },
599 { PCI_VDEVICE(VIA, 0x0581), },
600 { PCI_VDEVICE(VIA, 0x1571), },
601 { PCI_VDEVICE(VIA, 0x3164), },
602 { PCI_VDEVICE(VIA, 0x5324), },
603 { PCI_VDEVICE(VIA, 0xC409), VIA_IDFLAG_SINGLE },
604
605 { },
606 };
607
608 static struct pci_driver via_pci_driver = {
609 .name = DRV_NAME,
610 .id_table = via,
611 .probe = via_init_one,
612 .remove = ata_pci_remove_one,
613 #ifdef CONFIG_PM
614 .suspend = ata_pci_device_suspend,
615 .resume = via_reinit_one,
616 #endif
617 };
618
619 static int __init via_init(void)
620 {
621 return pci_register_driver(&via_pci_driver);
622 }
623
624 static void __exit via_exit(void)
625 {
626 pci_unregister_driver(&via_pci_driver);
627 }
628
629 MODULE_AUTHOR("Alan Cox");
630 MODULE_DESCRIPTION("low-level driver for VIA PATA");
631 MODULE_LICENSE("GPL");
632 MODULE_DEVICE_TABLE(pci, via);
633 MODULE_VERSION(DRV_VERSION);
634
635 module_init(via_init);
636 module_exit(via_exit);
A cbs scheduler for rt-kernel