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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * pata_serverworks.c - Serverworks PATA for new ATA layer
4 * (C) 2005 Red Hat Inc
5 * (C) 2010 Bartlomiej Zolnierkiewicz
6 *
7 * based upon
8 *
9 * serverworks.c
10 *
11 * Copyright (C) 1998-2000 Michel Aubry
12 * Copyright (C) 1998-2000 Andrzej Krzysztofowicz
13 * Copyright (C) 1998-2000 Andre Hedrick <andre@linux-ide.org>
14 * Portions copyright (c) 2001 Sun Microsystems
15 *
16 *
17 * RCC/ServerWorks IDE driver for Linux
18 *
19 * OSB4: `Open South Bridge' IDE Interface (fn 1)
20 * supports UDMA mode 2 (33 MB/s)
21 *
22 * CSB5: `Champion South Bridge' IDE Interface (fn 1)
23 * all revisions support UDMA mode 4 (66 MB/s)
24 * revision A2.0 and up support UDMA mode 5 (100 MB/s)
25 *
26 * *** The CSB5 does not provide ANY register ***
27 * *** to detect 80-conductor cable presence. ***
28 *
29 * CSB6: `Champion South Bridge' IDE Interface (optional: third channel)
30 *
31 * Documentation:
32 * Available under NDA only. Errata info very hard to get.
33 */
34
35#include <linux/kernel.h>
36#include <linux/module.h>
37#include <linux/pci.h>
38#include <linux/blkdev.h>
39#include <linux/delay.h>
40#include <scsi/scsi_host.h>
41#include <linux/libata.h>
42
43#define DRV_NAME "pata_serverworks"
44#define DRV_VERSION "0.4.3"
45
46#define SVWKS_CSB5_REVISION_NEW 0x92 /* min PCI_REVISION_ID for UDMA5 (A2.0) */
47#define SVWKS_CSB6_REVISION 0xa0 /* min PCI_REVISION_ID for UDMA4 (A1.0) */
48
49/*
50 * Seagate Barracuda ATA IV Family drives in UDMA mode 5
51 * can overrun their FIFOs when used with the CSB5.
52 */
53static const char * const csb_bad_ata100[] = {
54 "ST320011A",
55 "ST340016A",
56 "ST360021A",
57 "ST380021A",
58 NULL
59};
60
61/**
62 * oem_cable - Dell/Sun serverworks cable detection
63 * @ap: ATA port to do cable detect
64 *
65 * Dell PowerEdge and Sun Cobalt 'Alpine' hide the 40/80 pin select
66 * for their interfaces in the top two bits of the subsystem ID.
67 */
68
69static int oem_cable(struct ata_port *ap)
70{
71 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
72
73 if (pdev->subsystem_device & (1 << (ap->port_no + 14)))
74 return ATA_CBL_PATA80;
75 return ATA_CBL_PATA40;
76}
77
78struct sv_cable_table {
79 int device;
80 int subvendor;
81 int (*cable_detect)(struct ata_port *ap);
82};
83
84static struct sv_cable_table cable_detect[] = {
85 { PCI_DEVICE_ID_SERVERWORKS_CSB5IDE, PCI_VENDOR_ID_DELL, oem_cable },
86 { PCI_DEVICE_ID_SERVERWORKS_CSB6IDE, PCI_VENDOR_ID_DELL, oem_cable },
87 { PCI_DEVICE_ID_SERVERWORKS_CSB5IDE, PCI_VENDOR_ID_SUN, oem_cable },
88 { PCI_DEVICE_ID_SERVERWORKS_OSB4IDE, PCI_ANY_ID, ata_cable_40wire },
89 { PCI_DEVICE_ID_SERVERWORKS_CSB5IDE, PCI_ANY_ID, ata_cable_unknown },
90 { PCI_DEVICE_ID_SERVERWORKS_CSB6IDE, PCI_ANY_ID, ata_cable_unknown },
91 { PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2, PCI_ANY_ID, ata_cable_unknown },
92 { PCI_DEVICE_ID_SERVERWORKS_HT1000IDE, PCI_ANY_ID, ata_cable_unknown },
93 { }
94};
95
96/**
97 * serverworks_cable_detect - cable detection
98 * @ap: ATA port
99 *
100 * Perform cable detection according to the device and subvendor
101 * identifications
102 */
103
104static int serverworks_cable_detect(struct ata_port *ap)
105{
106 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
107 struct sv_cable_table *cb = cable_detect;
108
109 while(cb->device) {
110 if (cb->device == pdev->device &&
111 (cb->subvendor == pdev->subsystem_vendor ||
112 cb->subvendor == PCI_ANY_ID)) {
113 return cb->cable_detect(ap);
114 }
115 cb++;
116 }
117
118 BUG();
119 return -1; /* kill compiler warning */
120}
121
122/**
123 * serverworks_is_csb - Check for CSB or OSB
124 * @pdev: PCI device to check
125 *
126 * Returns true if the device being checked is known to be a CSB
127 * series device.
128 */
129
130static u8 serverworks_is_csb(struct pci_dev *pdev)
131{
132 switch (pdev->device) {
133 case PCI_DEVICE_ID_SERVERWORKS_CSB5IDE:
134 case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE:
135 case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2:
136 case PCI_DEVICE_ID_SERVERWORKS_HT1000IDE:
137 return 1;
138 default:
139 break;
140 }
141 return 0;
142}
143
144/**
145 * serverworks_osb4_filter - mode selection filter
146 * @adev: ATA device
147 * @mask: Mask of proposed modes
148 *
149 * Filter the offered modes for the device to apply controller
150 * specific rules. OSB4 requires no UDMA for disks due to a FIFO
151 * bug we hit.
152 */
153
154static unsigned int serverworks_osb4_filter(struct ata_device *adev, unsigned int mask)
155{
156 if (adev->class == ATA_DEV_ATA)
157 mask &= ~ATA_MASK_UDMA;
158 return mask;
159}
160
161
162/**
163 * serverworks_csb_filter - mode selection filter
164 * @adev: ATA device
165 * @mask: Mask of proposed modes
166 *
167 * Check the list of devices with broken UDMA5 and
168 * disable UDMA5 if matched.
169 */
170static unsigned int serverworks_csb_filter(struct ata_device *adev,
171 unsigned int mask)
172{
173 const char *p;
174 char model_num[ATA_ID_PROD_LEN + 1];
175 int i;
176
177 /* Disk, UDMA */
178 if (adev->class != ATA_DEV_ATA)
179 return mask;
180
181 /* Actually do need to check */
182 ata_id_c_string(adev->id, model_num, ATA_ID_PROD, sizeof(model_num));
183
184 for (i = 0; (p = csb_bad_ata100[i]) != NULL; i++) {
185 if (!strcmp(p, model_num))
186 mask &= ~(0xE0 << ATA_SHIFT_UDMA);
187 }
188 return mask;
189}
190
191/**
192 * serverworks_set_piomode - set initial PIO mode data
193 * @ap: ATA interface
194 * @adev: ATA device
195 *
196 * Program the OSB4/CSB5 timing registers for PIO. The PIO register
197 * load is done as a simple lookup.
198 */
199static void serverworks_set_piomode(struct ata_port *ap, struct ata_device *adev)
200{
201 static const u8 pio_mode[] = { 0x5d, 0x47, 0x34, 0x22, 0x20 };
202 int offset = 1 + 2 * ap->port_no - adev->devno;
203 int devbits = (2 * ap->port_no + adev->devno) * 4;
204 u16 csb5_pio;
205 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
206 int pio = adev->pio_mode - XFER_PIO_0;
207
208 pci_write_config_byte(pdev, 0x40 + offset, pio_mode[pio]);
209
210 /* The OSB4 just requires the timing but the CSB series want the
211 mode number as well */
212 if (serverworks_is_csb(pdev)) {
213 pci_read_config_word(pdev, 0x4A, &csb5_pio);
214 csb5_pio &= ~(0x0F << devbits);
215 pci_write_config_word(pdev, 0x4A, csb5_pio | (pio << devbits));
216 }
217}
218
219/**
220 * serverworks_set_dmamode - set initial DMA mode data
221 * @ap: ATA interface
222 * @adev: ATA device
223 *
224 * Program the MWDMA/UDMA modes for the serverworks OSB4/CSB5
225 * chipset. The MWDMA mode values are pulled from a lookup table
226 * while the chipset uses mode number for UDMA.
227 */
228
229static void serverworks_set_dmamode(struct ata_port *ap, struct ata_device *adev)
230{
231 static const u8 dma_mode[] = { 0x77, 0x21, 0x20 };
232 int offset = 1 + 2 * ap->port_no - adev->devno;
233 int devbits = 2 * ap->port_no + adev->devno;
234 u8 ultra;
235 u8 ultra_cfg;
236 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
237
238 pci_read_config_byte(pdev, 0x54, &ultra_cfg);
239 pci_read_config_byte(pdev, 0x56 + ap->port_no, &ultra);
240 ultra &= ~(0x0F << (adev->devno * 4));
241
242 if (adev->dma_mode >= XFER_UDMA_0) {
243 pci_write_config_byte(pdev, 0x44 + offset, 0x20);
244
245 ultra |= (adev->dma_mode - XFER_UDMA_0)
246 << (adev->devno * 4);
247 ultra_cfg |= (1 << devbits);
248 } else {
249 pci_write_config_byte(pdev, 0x44 + offset,
250 dma_mode[adev->dma_mode - XFER_MW_DMA_0]);
251 ultra_cfg &= ~(1 << devbits);
252 }
253 pci_write_config_byte(pdev, 0x56 + ap->port_no, ultra);
254 pci_write_config_byte(pdev, 0x54, ultra_cfg);
255}
256
257static const struct scsi_host_template serverworks_osb4_sht = {
258 ATA_BASE_SHT(DRV_NAME),
259 .sg_tablesize = LIBATA_DUMB_MAX_PRD,
260 .dma_boundary = ATA_DMA_BOUNDARY,
261};
262
263static const struct scsi_host_template serverworks_csb_sht = {
264 ATA_BMDMA_SHT(DRV_NAME),
265};
266
267static struct ata_port_operations serverworks_osb4_port_ops = {
268 .inherits = &ata_bmdma_port_ops,
269 .qc_prep = ata_bmdma_dumb_qc_prep,
270 .cable_detect = serverworks_cable_detect,
271 .mode_filter = serverworks_osb4_filter,
272 .set_piomode = serverworks_set_piomode,
273 .set_dmamode = serverworks_set_dmamode,
274};
275
276static struct ata_port_operations serverworks_csb_port_ops = {
277 .inherits = &serverworks_osb4_port_ops,
278 .qc_prep = ata_bmdma_qc_prep,
279 .mode_filter = serverworks_csb_filter,
280};
281
282static int serverworks_fixup_osb4(struct pci_dev *pdev)
283{
284 u32 reg;
285 struct pci_dev *isa_dev = pci_get_device(PCI_VENDOR_ID_SERVERWORKS,
286 PCI_DEVICE_ID_SERVERWORKS_OSB4, NULL);
287 if (isa_dev) {
288 pci_read_config_dword(isa_dev, 0x64, ®);
289 reg &= ~0x00002000; /* disable 600ns interrupt mask */
290 if (!(reg & 0x00004000))
291 dev_info(&pdev->dev, "UDMA not BIOS enabled.\n");
292 reg |= 0x00004000; /* enable UDMA/33 support */
293 pci_write_config_dword(isa_dev, 0x64, reg);
294 pci_dev_put(isa_dev);
295 return 0;
296 }
297 dev_warn(&pdev->dev, "Unable to find bridge.\n");
298 return -ENODEV;
299}
300
301static int serverworks_fixup_csb(struct pci_dev *pdev)
302{
303 u8 btr;
304
305 /* Third Channel Test */
306 if (!(PCI_FUNC(pdev->devfn) & 1)) {
307 struct pci_dev * findev = NULL;
308 u32 reg4c = 0;
309 findev = pci_get_device(PCI_VENDOR_ID_SERVERWORKS,
310 PCI_DEVICE_ID_SERVERWORKS_CSB5, NULL);
311 if (findev) {
312 pci_read_config_dword(findev, 0x4C, ®4c);
313 reg4c &= ~0x000007FF;
314 reg4c |= 0x00000040;
315 reg4c |= 0x00000020;
316 pci_write_config_dword(findev, 0x4C, reg4c);
317 pci_dev_put(findev);
318 }
319 } else {
320 struct pci_dev * findev = NULL;
321 u8 reg41 = 0;
322
323 findev = pci_get_device(PCI_VENDOR_ID_SERVERWORKS,
324 PCI_DEVICE_ID_SERVERWORKS_CSB6, NULL);
325 if (findev) {
326 pci_read_config_byte(findev, 0x41, ®41);
327 reg41 &= ~0x40;
328 pci_write_config_byte(findev, 0x41, reg41);
329 pci_dev_put(findev);
330 }
331 }
332 /* setup the UDMA Control register
333 *
334 * 1. clear bit 6 to enable DMA
335 * 2. enable DMA modes with bits 0-1
336 * 00 : legacy
337 * 01 : udma2
338 * 10 : udma2/udma4
339 * 11 : udma2/udma4/udma5
340 */
341 pci_read_config_byte(pdev, 0x5A, &btr);
342 btr &= ~0x40;
343 if (!(PCI_FUNC(pdev->devfn) & 1))
344 btr |= 0x2;
345 else
346 btr |= (pdev->revision >= SVWKS_CSB5_REVISION_NEW) ? 0x3 : 0x2;
347 pci_write_config_byte(pdev, 0x5A, btr);
348
349 return btr;
350}
351
352static void serverworks_fixup_ht1000(struct pci_dev *pdev)
353{
354 u8 btr;
355 /* Setup HT1000 SouthBridge Controller - Single Channel Only */
356 pci_read_config_byte(pdev, 0x5A, &btr);
357 btr &= ~0x40;
358 btr |= 0x3;
359 pci_write_config_byte(pdev, 0x5A, btr);
360}
361
362static int serverworks_fixup(struct pci_dev *pdev)
363{
364 int rc = 0;
365
366 /* Force master latency timer to 64 PCI clocks */
367 pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 0x40);
368
369 switch (pdev->device) {
370 case PCI_DEVICE_ID_SERVERWORKS_OSB4IDE:
371 rc = serverworks_fixup_osb4(pdev);
372 break;
373 case PCI_DEVICE_ID_SERVERWORKS_CSB5IDE:
374 ata_pci_bmdma_clear_simplex(pdev);
375 fallthrough;
376 case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE:
377 case PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2:
378 rc = serverworks_fixup_csb(pdev);
379 break;
380 case PCI_DEVICE_ID_SERVERWORKS_HT1000IDE:
381 serverworks_fixup_ht1000(pdev);
382 break;
383 }
384
385 return rc;
386}
387
388static int serverworks_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
389{
390 static const struct ata_port_info info[4] = {
391 { /* OSB4 */
392 .flags = ATA_FLAG_SLAVE_POSS,
393 .pio_mask = ATA_PIO4,
394 .mwdma_mask = ATA_MWDMA2,
395 .udma_mask = ATA_UDMA2,
396 .port_ops = &serverworks_osb4_port_ops
397 }, { /* OSB4 no UDMA */
398 .flags = ATA_FLAG_SLAVE_POSS,
399 .pio_mask = ATA_PIO4,
400 .mwdma_mask = ATA_MWDMA2,
401 /* No UDMA */
402 .port_ops = &serverworks_osb4_port_ops
403 }, { /* CSB5 */
404 .flags = ATA_FLAG_SLAVE_POSS,
405 .pio_mask = ATA_PIO4,
406 .mwdma_mask = ATA_MWDMA2,
407 .udma_mask = ATA_UDMA4,
408 .port_ops = &serverworks_csb_port_ops
409 }, { /* CSB5 - later revisions*/
410 .flags = ATA_FLAG_SLAVE_POSS,
411 .pio_mask = ATA_PIO4,
412 .mwdma_mask = ATA_MWDMA2,
413 .udma_mask = ATA_UDMA5,
414 .port_ops = &serverworks_csb_port_ops
415 }
416 };
417 const struct ata_port_info *ppi[] = { &info[id->driver_data], NULL };
418 const struct scsi_host_template *sht = &serverworks_csb_sht;
419 int rc;
420
421 rc = pcim_enable_device(pdev);
422 if (rc)
423 return rc;
424
425 rc = serverworks_fixup(pdev);
426
427 /* OSB4 : South Bridge and IDE */
428 if (pdev->device == PCI_DEVICE_ID_SERVERWORKS_OSB4IDE) {
429 /* Select non UDMA capable OSB4 if we can't do fixups */
430 if (rc < 0)
431 ppi[0] = &info[1];
432 sht = &serverworks_osb4_sht;
433 }
434 /* setup CSB5/CSB6 : South Bridge and IDE option RAID */
435 else if ((pdev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5IDE) ||
436 (pdev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE) ||
437 (pdev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2)) {
438
439 /* If the returned btr is the newer revision then
440 select the right info block */
441 if (rc == 3)
442 ppi[0] = &info[3];
443
444 /* Is this the 3rd channel CSB6 IDE ? */
445 if (pdev->device == PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2)
446 ppi[1] = &ata_dummy_port_info;
447 }
448
449 return ata_pci_bmdma_init_one(pdev, ppi, sht, NULL, 0);
450}
451
452#ifdef CONFIG_PM_SLEEP
453static int serverworks_reinit_one(struct pci_dev *pdev)
454{
455 struct ata_host *host = pci_get_drvdata(pdev);
456 int rc;
457
458 rc = ata_pci_device_do_resume(pdev);
459 if (rc)
460 return rc;
461
462 (void)serverworks_fixup(pdev);
463
464 ata_host_resume(host);
465 return 0;
466}
467#endif
468
469static const struct pci_device_id serverworks[] = {
470 { PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_OSB4IDE), 0},
471 { PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB5IDE), 2},
472 { PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB6IDE), 2},
473 { PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB6IDE2), 2},
474 { PCI_VDEVICE(SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_HT1000IDE), 2},
475
476 { },
477};
478
479static struct pci_driver serverworks_pci_driver = {
480 .name = DRV_NAME,
481 .id_table = serverworks,
482 .probe = serverworks_init_one,
483 .remove = ata_pci_remove_one,
484#ifdef CONFIG_PM_SLEEP
485 .suspend = ata_pci_device_suspend,
486 .resume = serverworks_reinit_one,
487#endif
488};
489
490module_pci_driver(serverworks_pci_driver);
491
492MODULE_AUTHOR("Alan Cox");
493MODULE_DESCRIPTION("low-level driver for Serverworks OSB4/CSB5/CSB6");
494MODULE_LICENSE("GPL");
495MODULE_DEVICE_TABLE(pci, serverworks);
496MODULE_VERSION(DRV_VERSION);