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module: Convert symbol namespace to string literal
[linux.git] / drivers / i2c / busses / i2c-piix4.c
blobdd75916157f0519a17fb3d45432d7cf1373bd22a
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl> and
4 Philip Edelbrock <phil@netroedge.com>
5
6 */
7
8 /*
9 Supports:
10 Intel PIIX4, 440MX
11 Serverworks OSB4, CSB5, CSB6, HT-1000, HT-1100
12 ATI IXP200, IXP300, IXP400, SB600, SB700/SP5100, SB800
13 AMD Hudson-2, ML, CZ
14 Hygon CZ
15 SMSC Victory66
16
17 Note: we assume there can only be one device, with one or more
18 SMBus interfaces.
19 The device can register multiple i2c_adapters (up to PIIX4_MAX_ADAPTERS).
20 For devices supporting multiple ports the i2c_adapter should provide
21 an i2c_algorithm to access them.
22 */
23
24 #include <linux/module.h>
25 #include <linux/moduleparam.h>
26 #include <linux/pci.h>
27 #include <linux/kernel.h>
28 #include <linux/delay.h>
29 #include <linux/stddef.h>
30 #include <linux/ioport.h>
31 #include <linux/i2c.h>
32 #include <linux/i2c-smbus.h>
33 #include <linux/slab.h>
34 #include <linux/dmi.h>
35 #include <linux/acpi.h>
36 #include <linux/io.h>
37
38 #include "i2c-piix4.h"
39
40 /* count for request_region */
41 #define SMBIOSIZE 9
42
43 /* PCI Address Constants */
44 #define SMBBA 0x090
45 #define SMBHSTCFG 0x0D2
46 #define SMBSLVC 0x0D3
47 #define SMBSHDW1 0x0D4
48 #define SMBSHDW2 0x0D5
49 #define SMBREV 0x0D6
50
51 /* Other settings */
52 #define MAX_TIMEOUT 500
53 #define ENABLE_INT9 0
54
55 /* PIIX4 constants */
56 #define PIIX4_QUICK 0x00
57 #define PIIX4_BYTE 0x04
58 #define PIIX4_BYTE_DATA 0x08
59 #define PIIX4_WORD_DATA 0x0C
60
61 /* Multi-port constants */
62 #define PIIX4_MAX_ADAPTERS 4
63 #define HUDSON2_MAIN_PORTS 2 /* HUDSON2, KERNCZ reserves ports 3, 4 */
64
65 /* SB800 constants */
66 #define SB800_PIIX4_SMB_IDX 0xcd6
67 #define SB800_PIIX4_SMB_MAP_SIZE 2
68
69 #define KERNCZ_IMC_IDX 0x3e
70 #define KERNCZ_IMC_DATA 0x3f
71
72 /*
73 * SB800 port is selected by bits 2:1 of the smb_en register (0x2c)
74 * or the smb_sel register (0x2e), depending on bit 0 of register 0x2f.
75 * Hudson-2/Bolton port is always selected by bits 2:1 of register 0x2f.
76 */
77 #define SB800_PIIX4_PORT_IDX 0x2c
78 #define SB800_PIIX4_PORT_IDX_ALT 0x2e
79 #define SB800_PIIX4_PORT_IDX_SEL 0x2f
80 #define SB800_PIIX4_PORT_IDX_MASK 0x06
81 #define SB800_PIIX4_PORT_IDX_SHIFT 1
82
83 /* On kerncz and Hudson2, SmBus0Sel is at bit 20:19 of PMx00 DecodeEn */
84 #define SB800_PIIX4_PORT_IDX_KERNCZ 0x02
85 #define SB800_PIIX4_PORT_IDX_MASK_KERNCZ 0x18
86 #define SB800_PIIX4_PORT_IDX_SHIFT_KERNCZ 3
87
88 #define SB800_PIIX4_FCH_PM_ADDR 0xFED80300
89 #define SB800_PIIX4_FCH_PM_SIZE 8
90 #define SB800_ASF_ACPI_PATH "\\_SB.ASFC"
91
92 /* insmod parameters */
93
94 /* If force is set to anything different from 0, we forcibly enable the
95 PIIX4. DANGEROUS! */
96 static int force;
97 module_param (force, int, 0);
98 MODULE_PARM_DESC(force, "Forcibly enable the PIIX4. DANGEROUS!");
99
100 /* If force_addr is set to anything different from 0, we forcibly enable
101 the PIIX4 at the given address. VERY DANGEROUS! */
102 static int force_addr;
103 module_param_hw(force_addr, int, ioport, 0);
104 MODULE_PARM_DESC(force_addr,
105 "Forcibly enable the PIIX4 at the given address. "
106 "EXTREMELY DANGEROUS!");
107
108 static int srvrworks_csb5_delay;
109 static struct pci_driver piix4_driver;
110
111 static const struct dmi_system_id piix4_dmi_blacklist[] = {
112 {
113 .ident = "Sapphire AM2RD790",
114 .matches = {
115 DMI_MATCH(DMI_BOARD_VENDOR, "SAPPHIRE Inc."),
116 DMI_MATCH(DMI_BOARD_NAME, "PC-AM2RD790"),
117 },
118 },
119 {
120 .ident = "DFI Lanparty UT 790FX",
121 .matches = {
122 DMI_MATCH(DMI_BOARD_VENDOR, "DFI Inc."),
123 DMI_MATCH(DMI_BOARD_NAME, "LP UT 790FX"),
124 },
125 },
126 { }
127 };
128
129 /* The IBM entry is in a separate table because we only check it
130 on Intel-based systems */
131 static const struct dmi_system_id piix4_dmi_ibm[] = {
132 {
133 .ident = "IBM",
134 .matches = { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
135 },
136 { }
137 };
138
139 /*
140 * SB800 globals
141 */
142 static u8 piix4_port_sel_sb800;
143 static u8 piix4_port_mask_sb800;
144 static u8 piix4_port_shift_sb800;
145 static const char *piix4_main_port_names_sb800[PIIX4_MAX_ADAPTERS] = {
146 " port 0", " port 2", " port 3", " port 4"
147 };
148 static const char *piix4_aux_port_name_sb800 = " port 1";
149
150 struct i2c_piix4_adapdata {
151 unsigned short smba;
152
153 /* SB800 */
154 bool sb800_main;
155 bool notify_imc;
156 u8 port; /* Port number, shifted */
157 struct sb800_mmio_cfg mmio_cfg;
158 };
159
160 int piix4_sb800_region_request(struct device *dev, struct sb800_mmio_cfg *mmio_cfg)
161 {
162 if (mmio_cfg->use_mmio) {
163 void __iomem *addr;
164
165 if (!request_mem_region_muxed(SB800_PIIX4_FCH_PM_ADDR,
166 SB800_PIIX4_FCH_PM_SIZE,
167 "sb800_piix4_smb")) {
168 dev_err(dev,
169 "SMBus base address memory region 0x%x already in use.\n",
170 SB800_PIIX4_FCH_PM_ADDR);
171 return -EBUSY;
172 }
173
174 addr = ioremap(SB800_PIIX4_FCH_PM_ADDR,
175 SB800_PIIX4_FCH_PM_SIZE);
176 if (!addr) {
177 release_mem_region(SB800_PIIX4_FCH_PM_ADDR,
178 SB800_PIIX4_FCH_PM_SIZE);
179 dev_err(dev, "SMBus base address mapping failed.\n");
180 return -ENOMEM;
181 }
182
183 mmio_cfg->addr = addr;
184
185 return 0;
186 }
187
188 if (!request_muxed_region(SB800_PIIX4_SMB_IDX, SB800_PIIX4_SMB_MAP_SIZE,
189 "sb800_piix4_smb")) {
190 dev_err(dev,
191 "SMBus base address index region 0x%x already in use.\n",
192 SB800_PIIX4_SMB_IDX);
193 return -EBUSY;
194 }
195
196 return 0;
197 }
198 EXPORT_SYMBOL_NS_GPL(piix4_sb800_region_request, "PIIX4_SMBUS");
199
200 void piix4_sb800_region_release(struct device *dev, struct sb800_mmio_cfg *mmio_cfg)
201 {
202 if (mmio_cfg->use_mmio) {
203 iounmap(mmio_cfg->addr);
204 release_mem_region(SB800_PIIX4_FCH_PM_ADDR,
205 SB800_PIIX4_FCH_PM_SIZE);
206 return;
207 }
208
209 release_region(SB800_PIIX4_SMB_IDX, SB800_PIIX4_SMB_MAP_SIZE);
210 }
211 EXPORT_SYMBOL_NS_GPL(piix4_sb800_region_release, "PIIX4_SMBUS");
212
213 static bool piix4_sb800_use_mmio(struct pci_dev *PIIX4_dev)
214 {
215 /*
216 * cd6h/cd7h port I/O accesses can be disabled on AMD processors
217 * w/ SMBus PCI revision ID 0x51 or greater. MMIO is supported on
218 * the same processors and is the recommended access method.
219 */
220 return (PIIX4_dev->vendor == PCI_VENDOR_ID_AMD &&
221 PIIX4_dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS &&
222 PIIX4_dev->revision >= 0x51);
223 }
224
225 static int piix4_setup(struct pci_dev *PIIX4_dev,
226 const struct pci_device_id *id)
227 {
228 unsigned char temp;
229 unsigned short piix4_smba;
230
231 if ((PIIX4_dev->vendor == PCI_VENDOR_ID_SERVERWORKS) &&
232 (PIIX4_dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5))
233 srvrworks_csb5_delay = 1;
234
235 /* On some motherboards, it was reported that accessing the SMBus
236 caused severe hardware problems */
237 if (dmi_check_system(piix4_dmi_blacklist)) {
238 dev_err(&PIIX4_dev->dev,
239 "Accessing the SMBus on this system is unsafe!\n");
240 return -EPERM;
241 }
242
243 /* Don't access SMBus on IBM systems which get corrupted eeproms */
244 if (dmi_check_system(piix4_dmi_ibm) &&
245 PIIX4_dev->vendor == PCI_VENDOR_ID_INTEL) {
246 dev_err(&PIIX4_dev->dev, "IBM system detected; this module "
247 "may corrupt your serial eeprom! Refusing to load "
248 "module!\n");
249 return -EPERM;
250 }
251
252 /* Determine the address of the SMBus areas */
253 if (force_addr) {
254 piix4_smba = force_addr & 0xfff0;
255 force = 0;
256 } else {
257 pci_read_config_word(PIIX4_dev, SMBBA, &piix4_smba);
258 piix4_smba &= 0xfff0;
259 if(piix4_smba == 0) {
260 dev_err(&PIIX4_dev->dev, "SMBus base address "
261 "uninitialized - upgrade BIOS or use "
262 "force_addr=0xaddr\n");
263 return -ENODEV;
264 }
265 }
266
267 if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
268 return -ENODEV;
269
270 if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
271 dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
272 piix4_smba);
273 return -EBUSY;
274 }
275
276 pci_read_config_byte(PIIX4_dev, SMBHSTCFG, &temp);
277
278 /* If force_addr is set, we program the new address here. Just to make
279 sure, we disable the PIIX4 first. */
280 if (force_addr) {
281 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp & 0xfe);
282 pci_write_config_word(PIIX4_dev, SMBBA, piix4_smba);
283 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp | 0x01);
284 dev_info(&PIIX4_dev->dev, "WARNING: SMBus interface set to "
285 "new address %04x!\n", piix4_smba);
286 } else if ((temp & 1) == 0) {
287 if (force) {
288 /* This should never need to be done, but has been
289 * noted that many Dell machines have the SMBus
290 * interface on the PIIX4 disabled!? NOTE: This assumes
291 * I/O space and other allocations WERE done by the
292 * Bios! Don't complain if your hardware does weird
293 * things after enabling this. :') Check for Bios
294 * updates before resorting to this.
295 */
296 pci_write_config_byte(PIIX4_dev, SMBHSTCFG,
297 temp | 1);
298 dev_notice(&PIIX4_dev->dev,
299 "WARNING: SMBus interface has been FORCEFULLY ENABLED!\n");
300 } else {
301 dev_err(&PIIX4_dev->dev,
302 "SMBus Host Controller not enabled!\n");
303 release_region(piix4_smba, SMBIOSIZE);
304 return -ENODEV;
305 }
306 }
307
308 if (((temp & 0x0E) == 8) || ((temp & 0x0E) == 2))
309 dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus\n");
310 else if ((temp & 0x0E) == 0)
311 dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus\n");
312 else
313 dev_err(&PIIX4_dev->dev, "Illegal Interrupt configuration "
314 "(or code out of date)!\n");
315
316 pci_read_config_byte(PIIX4_dev, SMBREV, &temp);
317 dev_info(&PIIX4_dev->dev,
318 "SMBus Host Controller at 0x%x, revision %d\n",
319 piix4_smba, temp);
320
321 return piix4_smba;
322 }
323
324 static int piix4_setup_sb800_smba(struct pci_dev *PIIX4_dev,
325 u8 smb_en,
326 u8 aux,
327 u8 *smb_en_status,
328 unsigned short *piix4_smba)
329 {
330 struct sb800_mmio_cfg mmio_cfg;
331 u8 smba_en_lo;
332 u8 smba_en_hi;
333 int retval;
334
335 mmio_cfg.use_mmio = piix4_sb800_use_mmio(PIIX4_dev);
336 retval = piix4_sb800_region_request(&PIIX4_dev->dev, &mmio_cfg);
337 if (retval)
338 return retval;
339
340 if (mmio_cfg.use_mmio) {
341 smba_en_lo = ioread8(mmio_cfg.addr);
342 smba_en_hi = ioread8(mmio_cfg.addr + 1);
343 } else {
344 outb_p(smb_en, SB800_PIIX4_SMB_IDX);
345 smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
346 outb_p(smb_en + 1, SB800_PIIX4_SMB_IDX);
347 smba_en_hi = inb_p(SB800_PIIX4_SMB_IDX + 1);
348 }
349
350 piix4_sb800_region_release(&PIIX4_dev->dev, &mmio_cfg);
351
352 if (!smb_en) {
353 *smb_en_status = smba_en_lo & 0x10;
354 *piix4_smba = smba_en_hi << 8;
355 if (aux)
356 *piix4_smba |= 0x20;
357 } else {
358 *smb_en_status = smba_en_lo & 0x01;
359 *piix4_smba = ((smba_en_hi << 8) | smba_en_lo) & 0xffe0;
360 }
361
362 if (!*smb_en_status) {
363 dev_err(&PIIX4_dev->dev,
364 "SMBus Host Controller not enabled!\n");
365 return -ENODEV;
366 }
367
368 return 0;
369 }
370
371 static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
372 const struct pci_device_id *id, u8 aux)
373 {
374 unsigned short piix4_smba;
375 u8 smb_en, smb_en_status, port_sel;
376 u8 i2ccfg, i2ccfg_offset = 0x10;
377 struct sb800_mmio_cfg mmio_cfg;
378 int retval;
379
380 /* SB800 and later SMBus does not support forcing address */
381 if (force || force_addr) {
382 dev_err(&PIIX4_dev->dev, "SMBus does not support "
383 "forcing address!\n");
384 return -EINVAL;
385 }
386
387 /* Determine the address of the SMBus areas */
388 if ((PIIX4_dev->vendor == PCI_VENDOR_ID_AMD &&
389 PIIX4_dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS &&
390 PIIX4_dev->revision >= 0x41) ||
391 (PIIX4_dev->vendor == PCI_VENDOR_ID_AMD &&
392 PIIX4_dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS &&
393 PIIX4_dev->revision >= 0x49) ||
394 (PIIX4_dev->vendor == PCI_VENDOR_ID_HYGON &&
395 PIIX4_dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS))
396 smb_en = 0x00;
397 else
398 smb_en = (aux) ? 0x28 : 0x2c;
399
400 retval = piix4_setup_sb800_smba(PIIX4_dev, smb_en, aux, &smb_en_status,
401 &piix4_smba);
402
403 if (retval)
404 return retval;
405
406 if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
407 return -ENODEV;
408
409 if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
410 dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
411 piix4_smba);
412 return -EBUSY;
413 }
414
415 /* Aux SMBus does not support IRQ information */
416 if (aux) {
417 dev_info(&PIIX4_dev->dev,
418 "Auxiliary SMBus Host Controller at 0x%x\n",
419 piix4_smba);
420 return piix4_smba;
421 }
422
423 /* Request the SMBus I2C bus config region */
424 if (!request_region(piix4_smba + i2ccfg_offset, 1, "i2ccfg")) {
425 dev_err(&PIIX4_dev->dev, "SMBus I2C bus config region "
426 "0x%x already in use!\n", piix4_smba + i2ccfg_offset);
427 release_region(piix4_smba, SMBIOSIZE);
428 return -EBUSY;
429 }
430 i2ccfg = inb_p(piix4_smba + i2ccfg_offset);
431 release_region(piix4_smba + i2ccfg_offset, 1);
432
433 if (i2ccfg & 1)
434 dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus\n");
435 else
436 dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus\n");
437
438 dev_info(&PIIX4_dev->dev,
439 "SMBus Host Controller at 0x%x, revision %d\n",
440 piix4_smba, i2ccfg >> 4);
441
442 /* Find which register is used for port selection */
443 if (PIIX4_dev->vendor == PCI_VENDOR_ID_AMD ||
444 PIIX4_dev->vendor == PCI_VENDOR_ID_HYGON) {
445 if (PIIX4_dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS ||
446 (PIIX4_dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS &&
447 PIIX4_dev->revision >= 0x1F)) {
448 piix4_port_sel_sb800 = SB800_PIIX4_PORT_IDX_KERNCZ;
449 piix4_port_mask_sb800 = SB800_PIIX4_PORT_IDX_MASK_KERNCZ;
450 piix4_port_shift_sb800 = SB800_PIIX4_PORT_IDX_SHIFT_KERNCZ;
451 } else {
452 piix4_port_sel_sb800 = SB800_PIIX4_PORT_IDX_ALT;
453 piix4_port_mask_sb800 = SB800_PIIX4_PORT_IDX_MASK;
454 piix4_port_shift_sb800 = SB800_PIIX4_PORT_IDX_SHIFT;
455 }
456 } else {
457 mmio_cfg.use_mmio = piix4_sb800_use_mmio(PIIX4_dev);
458 retval = piix4_sb800_region_request(&PIIX4_dev->dev, &mmio_cfg);
459 if (retval) {
460 release_region(piix4_smba, SMBIOSIZE);
461 return retval;
462 }
463
464 outb_p(SB800_PIIX4_PORT_IDX_SEL, SB800_PIIX4_SMB_IDX);
465 port_sel = inb_p(SB800_PIIX4_SMB_IDX + 1);
466 piix4_port_sel_sb800 = (port_sel & 0x01) ?
467 SB800_PIIX4_PORT_IDX_ALT :
468 SB800_PIIX4_PORT_IDX;
469 piix4_port_mask_sb800 = SB800_PIIX4_PORT_IDX_MASK;
470 piix4_port_shift_sb800 = SB800_PIIX4_PORT_IDX_SHIFT;
471 piix4_sb800_region_release(&PIIX4_dev->dev, &mmio_cfg);
472 }
473
474 dev_info(&PIIX4_dev->dev,
475 "Using register 0x%02x for SMBus port selection\n",
476 (unsigned int)piix4_port_sel_sb800);
477
478 return piix4_smba;
479 }
480
481 static int piix4_setup_aux(struct pci_dev *PIIX4_dev,
482 const struct pci_device_id *id,
483 unsigned short base_reg_addr)
484 {
485 /* Set up auxiliary SMBus controllers found on some
486 * AMD chipsets e.g. SP5100 (SB700 derivative) */
487
488 unsigned short piix4_smba;
489
490 /* Read address of auxiliary SMBus controller */
491 pci_read_config_word(PIIX4_dev, base_reg_addr, &piix4_smba);
492 if ((piix4_smba & 1) == 0) {
493 dev_dbg(&PIIX4_dev->dev,
494 "Auxiliary SMBus controller not enabled\n");
495 return -ENODEV;
496 }
497
498 piix4_smba &= 0xfff0;
499 if (piix4_smba == 0) {
500 dev_dbg(&PIIX4_dev->dev,
501 "Auxiliary SMBus base address uninitialized\n");
502 return -ENODEV;
503 }
504
505 if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
506 return -ENODEV;
507
508 if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
509 dev_err(&PIIX4_dev->dev, "Auxiliary SMBus region 0x%x "
510 "already in use!\n", piix4_smba);
511 return -EBUSY;
512 }
513
514 dev_info(&PIIX4_dev->dev,
515 "Auxiliary SMBus Host Controller at 0x%x\n",
516 piix4_smba);
517
518 return piix4_smba;
519 }
520
521 int piix4_transaction(struct i2c_adapter *piix4_adapter, unsigned short piix4_smba)
522 {
523 int temp;
524 int result = 0;
525 int timeout = 0;
526
527 dev_dbg(&piix4_adapter->dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
528 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
529 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
530 inb_p(SMBHSTDAT1));
531
532 /* Make sure the SMBus host is ready to start transmitting */
533 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
534 dev_dbg(&piix4_adapter->dev, "SMBus busy (%02x). "
535 "Resetting...\n", temp);
536 outb_p(temp, SMBHSTSTS);
537 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
538 dev_err(&piix4_adapter->dev, "Failed! (%02x)\n", temp);
539 return -EBUSY;
540 } else {
541 dev_dbg(&piix4_adapter->dev, "Successful!\n");
542 }
543 }
544
545 /* start the transaction by setting bit 6 */
546 outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT);
547
548 /* We will always wait for a fraction of a second! (See PIIX4 docs errata) */
549 if (srvrworks_csb5_delay) /* Extra delay for SERVERWORKS_CSB5 */
550 usleep_range(2000, 2100);
551 else
552 usleep_range(250, 500);
553
554 while ((++timeout < MAX_TIMEOUT) &&
555 ((temp = inb_p(SMBHSTSTS)) & 0x01))
556 usleep_range(250, 500);
557
558 /* If the SMBus is still busy, we give up */
559 if (timeout == MAX_TIMEOUT) {
560 dev_err(&piix4_adapter->dev, "SMBus Timeout!\n");
561 result = -ETIMEDOUT;
562 }
563
564 if (temp & 0x10) {
565 result = -EIO;
566 dev_err(&piix4_adapter->dev, "Error: Failed bus transaction\n");
567 }
568
569 if (temp & 0x08) {
570 result = -EIO;
571 dev_dbg(&piix4_adapter->dev, "Bus collision! SMBus may be "
572 "locked until next hard reset. (sorry!)\n");
573 /* Clock stops and target is stuck in mid-transmission */
574 }
575
576 if (temp & 0x04) {
577 result = -ENXIO;
578 dev_dbg(&piix4_adapter->dev, "Error: no response!\n");
579 }
580
581 if (inb_p(SMBHSTSTS) != 0x00)
582 outb_p(inb(SMBHSTSTS), SMBHSTSTS);
583
584 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
585 dev_err(&piix4_adapter->dev, "Failed reset at end of "
586 "transaction (%02x)\n", temp);
587 }
588 dev_dbg(&piix4_adapter->dev, "Transaction (post): CNT=%02x, CMD=%02x, "
589 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
590 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
591 inb_p(SMBHSTDAT1));
592 return result;
593 }
594 EXPORT_SYMBOL_NS_GPL(piix4_transaction, "PIIX4_SMBUS");
595
596 /* Return negative errno on error. */
597 static s32 piix4_access(struct i2c_adapter * adap, u16 addr,
598 unsigned short flags, char read_write,
599 u8 command, int size, union i2c_smbus_data * data)
600 {
601 struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
602 unsigned short piix4_smba = adapdata->smba;
603 int i, len;
604 int status;
605
606 switch (size) {
607 case I2C_SMBUS_QUICK:
608 outb_p((addr << 1) | read_write,
609 SMBHSTADD);
610 size = PIIX4_QUICK;
611 break;
612 case I2C_SMBUS_BYTE:
613 outb_p((addr << 1) | read_write,
614 SMBHSTADD);
615 if (read_write == I2C_SMBUS_WRITE)
616 outb_p(command, SMBHSTCMD);
617 size = PIIX4_BYTE;
618 break;
619 case I2C_SMBUS_BYTE_DATA:
620 outb_p((addr << 1) | read_write,
621 SMBHSTADD);
622 outb_p(command, SMBHSTCMD);
623 if (read_write == I2C_SMBUS_WRITE)
624 outb_p(data->byte, SMBHSTDAT0);
625 size = PIIX4_BYTE_DATA;
626 break;
627 case I2C_SMBUS_WORD_DATA:
628 outb_p((addr << 1) | read_write,
629 SMBHSTADD);
630 outb_p(command, SMBHSTCMD);
631 if (read_write == I2C_SMBUS_WRITE) {
632 outb_p(data->word & 0xff, SMBHSTDAT0);
633 outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
634 }
635 size = PIIX4_WORD_DATA;
636 break;
637 case I2C_SMBUS_BLOCK_DATA:
638 outb_p((addr << 1) | read_write,
639 SMBHSTADD);
640 outb_p(command, SMBHSTCMD);
641 if (read_write == I2C_SMBUS_WRITE) {
642 len = data->block[0];
643 if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
644 return -EINVAL;
645 outb_p(len, SMBHSTDAT0);
646 inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
647 for (i = 1; i <= len; i++)
648 outb_p(data->block[i], SMBBLKDAT);
649 }
650 size = PIIX4_BLOCK_DATA;
651 break;
652 default:
653 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
654 return -EOPNOTSUPP;
655 }
656
657 outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);
658
659 status = piix4_transaction(adap, piix4_smba);
660 if (status)
661 return status;
662
663 if ((read_write == I2C_SMBUS_WRITE) || (size == PIIX4_QUICK))
664 return 0;
665
666
667 switch (size) {
668 case PIIX4_BYTE:
669 case PIIX4_BYTE_DATA:
670 data->byte = inb_p(SMBHSTDAT0);
671 break;
672 case PIIX4_WORD_DATA:
673 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
674 break;
675 case PIIX4_BLOCK_DATA:
676 data->block[0] = inb_p(SMBHSTDAT0);
677 if (data->block[0] == 0 || data->block[0] > I2C_SMBUS_BLOCK_MAX)
678 return -EPROTO;
679 inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
680 for (i = 1; i <= data->block[0]; i++)
681 data->block[i] = inb_p(SMBBLKDAT);
682 break;
683 }
684 return 0;
685 }
686
687 static uint8_t piix4_imc_read(uint8_t idx)
688 {
689 outb_p(idx, KERNCZ_IMC_IDX);
690 return inb_p(KERNCZ_IMC_DATA);
691 }
692
693 static void piix4_imc_write(uint8_t idx, uint8_t value)
694 {
695 outb_p(idx, KERNCZ_IMC_IDX);
696 outb_p(value, KERNCZ_IMC_DATA);
697 }
698
699 static int piix4_imc_sleep(void)
700 {
701 int timeout = MAX_TIMEOUT;
702
703 if (!request_muxed_region(KERNCZ_IMC_IDX, 2, "smbus_kerncz_imc"))
704 return -EBUSY;
705
706 /* clear response register */
707 piix4_imc_write(0x82, 0x00);
708 /* request ownership flag */
709 piix4_imc_write(0x83, 0xB4);
710 /* kick off IMC Mailbox command 96 */
711 piix4_imc_write(0x80, 0x96);
712
713 while (timeout--) {
714 if (piix4_imc_read(0x82) == 0xfa) {
715 release_region(KERNCZ_IMC_IDX, 2);
716 return 0;
717 }
718 usleep_range(1000, 2000);
719 }
720
721 release_region(KERNCZ_IMC_IDX, 2);
722 return -ETIMEDOUT;
723 }
724
725 static void piix4_imc_wakeup(void)
726 {
727 int timeout = MAX_TIMEOUT;
728
729 if (!request_muxed_region(KERNCZ_IMC_IDX, 2, "smbus_kerncz_imc"))
730 return;
731
732 /* clear response register */
733 piix4_imc_write(0x82, 0x00);
734 /* release ownership flag */
735 piix4_imc_write(0x83, 0xB5);
736 /* kick off IMC Mailbox command 96 */
737 piix4_imc_write(0x80, 0x96);
738
739 while (timeout--) {
740 if (piix4_imc_read(0x82) == 0xfa)
741 break;
742 usleep_range(1000, 2000);
743 }
744
745 release_region(KERNCZ_IMC_IDX, 2);
746 }
747
748 int piix4_sb800_port_sel(u8 port, struct sb800_mmio_cfg *mmio_cfg)
749 {
750 u8 smba_en_lo, val;
751
752 if (mmio_cfg->use_mmio) {
753 smba_en_lo = ioread8(mmio_cfg->addr + piix4_port_sel_sb800);
754 val = (smba_en_lo & ~piix4_port_mask_sb800) | port;
755 if (smba_en_lo != val)
756 iowrite8(val, mmio_cfg->addr + piix4_port_sel_sb800);
757
758 return (smba_en_lo & piix4_port_mask_sb800);
759 }
760
761 outb_p(piix4_port_sel_sb800, SB800_PIIX4_SMB_IDX);
762 smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
763
764 val = (smba_en_lo & ~piix4_port_mask_sb800) | port;
765 if (smba_en_lo != val)
766 outb_p(val, SB800_PIIX4_SMB_IDX + 1);
767
768 return (smba_en_lo & piix4_port_mask_sb800);
769 }
770 EXPORT_SYMBOL_NS_GPL(piix4_sb800_port_sel, "PIIX4_SMBUS");
771
772 /*
773 * Handles access to multiple SMBus ports on the SB800.
774 * The port is selected by bits 2:1 of the smb_en register (0x2c).
775 * Returns negative errno on error.
776 *
777 * Note: The selected port must be returned to the initial selection to avoid
778 * problems on certain systems.
779 */
780 static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
781 unsigned short flags, char read_write,
782 u8 command, int size, union i2c_smbus_data *data)
783 {
784 struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
785 unsigned short piix4_smba = adapdata->smba;
786 int retries = MAX_TIMEOUT;
787 int smbslvcnt;
788 u8 prev_port;
789 int retval;
790
791 retval = piix4_sb800_region_request(&adap->dev, &adapdata->mmio_cfg);
792 if (retval)
793 return retval;
794
795 /* Request the SMBUS semaphore, avoid conflicts with the IMC */
796 smbslvcnt = inb_p(SMBSLVCNT);
797 do {
798 outb_p(smbslvcnt | 0x10, SMBSLVCNT);
799
800 /* Check the semaphore status */
801 smbslvcnt = inb_p(SMBSLVCNT);
802 if (smbslvcnt & 0x10)
803 break;
804
805 usleep_range(1000, 2000);
806 } while (--retries);
807 /* SMBus is still owned by the IMC, we give up */
808 if (!retries) {
809 retval = -EBUSY;
810 goto release;
811 }
812
813 /*
814 * Notify the IMC (Integrated Micro Controller) if required.
815 * Among other responsibilities, the IMC is in charge of monitoring
816 * the System fans and temperature sensors, and act accordingly.
817 * All this is done through SMBus and can/will collide
818 * with our transactions if they are long (BLOCK_DATA).
819 * Therefore we need to request the ownership flag during those
820 * transactions.
821 */
822 if ((size == I2C_SMBUS_BLOCK_DATA) && adapdata->notify_imc) {
823 int ret;
824
825 ret = piix4_imc_sleep();
826 switch (ret) {
827 case -EBUSY:
828 dev_warn(&adap->dev,
829 "IMC base address index region 0x%x already in use.\n",
830 KERNCZ_IMC_IDX);
831 break;
832 case -ETIMEDOUT:
833 dev_warn(&adap->dev,
834 "Failed to communicate with the IMC.\n");
835 break;
836 default:
837 break;
838 }
839
840 /* If IMC communication fails do not retry */
841 if (ret) {
842 dev_warn(&adap->dev,
843 "Continuing without IMC notification.\n");
844 adapdata->notify_imc = false;
845 }
846 }
847
848 prev_port = piix4_sb800_port_sel(adapdata->port, &adapdata->mmio_cfg);
849
850 retval = piix4_access(adap, addr, flags, read_write,
851 command, size, data);
852
853 piix4_sb800_port_sel(prev_port, &adapdata->mmio_cfg);
854
855 /* Release the semaphore */
856 outb_p(smbslvcnt | 0x20, SMBSLVCNT);
857
858 if ((size == I2C_SMBUS_BLOCK_DATA) && adapdata->notify_imc)
859 piix4_imc_wakeup();
860
861 release:
862 piix4_sb800_region_release(&adap->dev, &adapdata->mmio_cfg);
863 return retval;
864 }
865
866 static u32 piix4_func(struct i2c_adapter *adapter)
867 {
868 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
869 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
870 I2C_FUNC_SMBUS_BLOCK_DATA;
871 }
872
873 static const struct i2c_algorithm smbus_algorithm = {
874 .smbus_xfer = piix4_access,
875 .functionality = piix4_func,
876 };
877
878 static const struct i2c_algorithm piix4_smbus_algorithm_sb800 = {
879 .smbus_xfer = piix4_access_sb800,
880 .functionality = piix4_func,
881 };
882
883 static const struct pci_device_id piix4_ids[] = {
884 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3) },
885 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443MX_3) },
886 { PCI_DEVICE(PCI_VENDOR_ID_EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_3) },
887 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP200_SMBUS) },
888 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP300_SMBUS) },
889 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS) },
890 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS) },
891 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS) },
892 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_KERNCZ_SMBUS) },
893 { PCI_DEVICE(PCI_VENDOR_ID_HYGON, PCI_DEVICE_ID_AMD_KERNCZ_SMBUS) },
894 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
895 PCI_DEVICE_ID_SERVERWORKS_OSB4) },
896 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
897 PCI_DEVICE_ID_SERVERWORKS_CSB5) },
898 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
899 PCI_DEVICE_ID_SERVERWORKS_CSB6) },
900 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
901 PCI_DEVICE_ID_SERVERWORKS_HT1000SB) },
902 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
903 PCI_DEVICE_ID_SERVERWORKS_HT1100LD) },
904 { 0, }
905 };
906
907 MODULE_DEVICE_TABLE (pci, piix4_ids);
908
909 static struct i2c_adapter *piix4_main_adapters[PIIX4_MAX_ADAPTERS];
910 static struct i2c_adapter *piix4_aux_adapter;
911 static int piix4_adapter_count;
912
913 static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba,
914 bool sb800_main, u8 port, bool notify_imc,
915 u8 hw_port_nr, const char *name,
916 struct i2c_adapter **padap)
917 {
918 struct i2c_adapter *adap;
919 struct i2c_piix4_adapdata *adapdata;
920 int retval;
921
922 adap = kzalloc(sizeof(*adap), GFP_KERNEL);
923 if (adap == NULL) {
924 release_region(smba, SMBIOSIZE);
925 return -ENOMEM;
926 }
927
928 adap->owner = THIS_MODULE;
929 adap->class = I2C_CLASS_HWMON;
930 adap->algo = sb800_main ? &piix4_smbus_algorithm_sb800
931 : &smbus_algorithm;
932
933 adapdata = kzalloc(sizeof(*adapdata), GFP_KERNEL);
934 if (adapdata == NULL) {
935 kfree(adap);
936 release_region(smba, SMBIOSIZE);
937 return -ENOMEM;
938 }
939
940 adapdata->mmio_cfg.use_mmio = piix4_sb800_use_mmio(dev);
941 adapdata->smba = smba;
942 adapdata->sb800_main = sb800_main;
943 adapdata->port = port << piix4_port_shift_sb800;
944 adapdata->notify_imc = notify_imc;
945
946 /* set up the sysfs linkage to our parent device */
947 adap->dev.parent = &dev->dev;
948
949 if (has_acpi_companion(&dev->dev)) {
950 acpi_preset_companion(&adap->dev,
951 ACPI_COMPANION(&dev->dev),
952 hw_port_nr);
953 }
954
955 snprintf(adap->name, sizeof(adap->name),
956 "SMBus PIIX4 adapter%s at %04x", name, smba);
957
958 i2c_set_adapdata(adap, adapdata);
959
960 retval = i2c_add_adapter(adap);
961 if (retval) {
962 kfree(adapdata);
963 kfree(adap);
964 release_region(smba, SMBIOSIZE);
965 return retval;
966 }
967
968 /*
969 * The AUX bus can not be probed as on some platforms it reports all
970 * devices present and all reads return "0".
971 * This would allow the ee1004 to be probed incorrectly.
972 */
973 if (port == 0)
974 i2c_register_spd(adap);
975
976 *padap = adap;
977 return 0;
978 }
979
980 static int piix4_add_adapters_sb800(struct pci_dev *dev, unsigned short smba,
981 bool notify_imc)
982 {
983 struct i2c_piix4_adapdata *adapdata;
984 int port;
985 int retval;
986
987 if (dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS ||
988 (dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS &&
989 dev->revision >= 0x1F)) {
990 piix4_adapter_count = HUDSON2_MAIN_PORTS;
991 } else {
992 piix4_adapter_count = PIIX4_MAX_ADAPTERS;
993 }
994
995 for (port = 0; port < piix4_adapter_count; port++) {
996 u8 hw_port_nr = port == 0 ? 0 : port + 1;
997
998 retval = piix4_add_adapter(dev, smba, true, port, notify_imc,
999 hw_port_nr,
1000 piix4_main_port_names_sb800[port],
1001 &piix4_main_adapters[port]);
1002 if (retval < 0)
1003 goto error;
1004 }
1005
1006 return retval;
1007
1008 error:
1009 dev_err(&dev->dev,
1010 "Error setting up SB800 adapters. Unregistering!\n");
1011 while (--port >= 0) {
1012 adapdata = i2c_get_adapdata(piix4_main_adapters[port]);
1013 if (adapdata->smba) {
1014 i2c_del_adapter(piix4_main_adapters[port]);
1015 kfree(adapdata);
1016 kfree(piix4_main_adapters[port]);
1017 piix4_main_adapters[port] = NULL;
1018 }
1019 }
1020
1021 return retval;
1022 }
1023
1024 static int piix4_probe(struct pci_dev *dev, const struct pci_device_id *id)
1025 {
1026 int retval;
1027 bool is_sb800 = false;
1028 bool is_asf = false;
1029 acpi_status status;
1030 acpi_handle handle;
1031
1032 if ((dev->vendor == PCI_VENDOR_ID_ATI &&
1033 dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
1034 dev->revision >= 0x40) ||
1035 dev->vendor == PCI_VENDOR_ID_AMD ||
1036 dev->vendor == PCI_VENDOR_ID_HYGON) {
1037 bool notify_imc = false;
1038 is_sb800 = true;
1039
1040 if ((dev->vendor == PCI_VENDOR_ID_AMD ||
1041 dev->vendor == PCI_VENDOR_ID_HYGON) &&
1042 dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS) {
1043 u8 imc;
1044
1045 /*
1046 * Detect if IMC is active or not, this method is
1047 * described on coreboot's AMD IMC notes
1048 */
1049 pci_bus_read_config_byte(dev->bus, PCI_DEVFN(0x14, 3),
1050 0x40, &imc);
1051 if (imc & 0x80)
1052 notify_imc = true;
1053 }
1054
1055 /* base address location etc changed in SB800 */
1056 retval = piix4_setup_sb800(dev, id, 0);
1057 if (retval < 0)
1058 return retval;
1059
1060 /*
1061 * Try to register multiplexed main SMBus adapter,
1062 * give up if we can't
1063 */
1064 retval = piix4_add_adapters_sb800(dev, retval, notify_imc);
1065 if (retval < 0)
1066 return retval;
1067 } else {
1068 retval = piix4_setup(dev, id);
1069 if (retval < 0)
1070 return retval;
1071
1072 /* Try to register main SMBus adapter, give up if we can't */
1073 retval = piix4_add_adapter(dev, retval, false, 0, false, 0,
1074 "", &piix4_main_adapters[0]);
1075 if (retval < 0)
1076 return retval;
1077 piix4_adapter_count = 1;
1078 }
1079
1080 /* Check for auxiliary SMBus on some AMD chipsets */
1081 retval = -ENODEV;
1082
1083 if (dev->vendor == PCI_VENDOR_ID_ATI &&
1084 dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS) {
1085 if (dev->revision < 0x40) {
1086 retval = piix4_setup_aux(dev, id, 0x58);
1087 } else {
1088 /* SB800 added aux bus too */
1089 retval = piix4_setup_sb800(dev, id, 1);
1090 }
1091 }
1092
1093 status = acpi_get_handle(NULL, (acpi_string)SB800_ASF_ACPI_PATH, &handle);
1094 if (ACPI_SUCCESS(status))
1095 is_asf = true;
1096
1097 if (dev->vendor == PCI_VENDOR_ID_AMD &&
1098 (dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS ||
1099 dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS)) {
1100 /* Do not setup AUX port if ASF is enabled */
1101 if (!is_asf)
1102 retval = piix4_setup_sb800(dev, id, 1);
1103 }
1104
1105 if (retval > 0) {
1106 /* Try to add the aux adapter if it exists,
1107 * piix4_add_adapter will clean up if this fails */
1108 piix4_add_adapter(dev, retval, false, 0, false, 1,
1109 is_sb800 ? piix4_aux_port_name_sb800 : "",
1110 &piix4_aux_adapter);
1111 }
1112
1113 return 0;
1114 }
1115
1116 static void piix4_adap_remove(struct i2c_adapter *adap)
1117 {
1118 struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
1119
1120 if (adapdata->smba) {
1121 i2c_del_adapter(adap);
1122 if (adapdata->port == (0 << piix4_port_shift_sb800))
1123 release_region(adapdata->smba, SMBIOSIZE);
1124 kfree(adapdata);
1125 kfree(adap);
1126 }
1127 }
1128
1129 static void piix4_remove(struct pci_dev *dev)
1130 {
1131 int port = piix4_adapter_count;
1132
1133 while (--port >= 0) {
1134 if (piix4_main_adapters[port]) {
1135 piix4_adap_remove(piix4_main_adapters[port]);
1136 piix4_main_adapters[port] = NULL;
1137 }
1138 }
1139
1140 if (piix4_aux_adapter) {
1141 piix4_adap_remove(piix4_aux_adapter);
1142 piix4_aux_adapter = NULL;
1143 }
1144 }
1145
1146 static struct pci_driver piix4_driver = {
1147 .name = "piix4_smbus",
1148 .id_table = piix4_ids,
1149 .probe = piix4_probe,
1150 .remove = piix4_remove,
1151 };
1152
1153 module_pci_driver(piix4_driver);
1154
1155 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>");
1156 MODULE_AUTHOR("Philip Edelbrock <phil@netroedge.com>");
1157 MODULE_DESCRIPTION("PIIX4 SMBus driver");
1158 MODULE_LICENSE("GPL");
Linux Kernel