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Linux/drivers/i2c/busses/i2c-piix4.c

  1 /*
  2     Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl> and
  3     Philip Edelbrock <phil@netroedge.com>
  4 
  5     This program is free software; you can redistribute it and/or modify
  6     it under the terms of the GNU General Public License as published by
  7     the Free Software Foundation; either version 2 of the License, or
  8     (at your option) any later version.
  9 
 10     This program is distributed in the hope that it will be useful,
 11     but WITHOUT ANY WARRANTY; without even the implied warranty of
 12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13     GNU General Public License for more details.
 14 */
 15 
 16 /*
 17    Supports:
 18         Intel PIIX4, 440MX
 19         Serverworks OSB4, CSB5, CSB6, HT-1000, HT-1100
 20         ATI IXP200, IXP300, IXP400, SB600, SB700/SP5100, SB800
 21         AMD Hudson-2, ML, CZ
 22         SMSC Victory66
 23 
 24    Note: we assume there can only be one device, with one or more
 25    SMBus interfaces.
 26    The device can register multiple i2c_adapters (up to PIIX4_MAX_ADAPTERS).
 27    For devices supporting multiple ports the i2c_adapter should provide
 28    an i2c_algorithm to access them.
 29 */
 30 
 31 #include <linux/module.h>
 32 #include <linux/moduleparam.h>
 33 #include <linux/pci.h>
 34 #include <linux/kernel.h>
 35 #include <linux/delay.h>
 36 #include <linux/stddef.h>
 37 #include <linux/ioport.h>
 38 #include <linux/i2c.h>
 39 #include <linux/slab.h>
 40 #include <linux/dmi.h>
 41 #include <linux/acpi.h>
 42 #include <linux/io.h>
 43 #include <linux/mutex.h>
 44 
 45 
 46 /* PIIX4 SMBus address offsets */
 47 #define SMBHSTSTS       (0 + piix4_smba)
 48 #define SMBHSLVSTS      (1 + piix4_smba)
 49 #define SMBHSTCNT       (2 + piix4_smba)
 50 #define SMBHSTCMD       (3 + piix4_smba)
 51 #define SMBHSTADD       (4 + piix4_smba)
 52 #define SMBHSTDAT0      (5 + piix4_smba)
 53 #define SMBHSTDAT1      (6 + piix4_smba)
 54 #define SMBBLKDAT       (7 + piix4_smba)
 55 #define SMBSLVCNT       (8 + piix4_smba)
 56 #define SMBSHDWCMD      (9 + piix4_smba)
 57 #define SMBSLVEVT       (0xA + piix4_smba)
 58 #define SMBSLVDAT       (0xC + piix4_smba)
 59 
 60 /* count for request_region */
 61 #define SMBIOSIZE       8
 62 
 63 /* PCI Address Constants */
 64 #define SMBBA           0x090
 65 #define SMBHSTCFG       0x0D2
 66 #define SMBSLVC         0x0D3
 67 #define SMBSHDW1        0x0D4
 68 #define SMBSHDW2        0x0D5
 69 #define SMBREV          0x0D6
 70 
 71 /* Other settings */
 72 #define MAX_TIMEOUT     500
 73 #define  ENABLE_INT9    0
 74 
 75 /* PIIX4 constants */
 76 #define PIIX4_QUICK             0x00
 77 #define PIIX4_BYTE              0x04
 78 #define PIIX4_BYTE_DATA         0x08
 79 #define PIIX4_WORD_DATA         0x0C
 80 #define PIIX4_BLOCK_DATA        0x14
 81 
 82 /* Multi-port constants */
 83 #define PIIX4_MAX_ADAPTERS 4
 84 
 85 /* SB800 constants */
 86 #define SB800_PIIX4_SMB_IDX             0xcd6
 87 
 88 /* SB800 port is selected by bits 2:1 of the smb_en register (0x2c) */
 89 #define SB800_PIIX4_PORT_IDX            0x2c
 90 #define SB800_PIIX4_PORT_IDX_MASK       0x06
 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 (force_addr, int, 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 /* SB800 globals */
140 static DEFINE_MUTEX(piix4_mutex_sb800);
141 static const char *piix4_main_port_names_sb800[PIIX4_MAX_ADAPTERS] = {
142         " port 0", " port 2", " port 3", " port 4"
143 };
144 static const char *piix4_aux_port_name_sb800 = " port 1";
145 
146 struct i2c_piix4_adapdata {
147         unsigned short smba;
148 
149         /* SB800 */
150         bool sb800_main;
151         unsigned short port;
152 };
153 
154 static int piix4_setup(struct pci_dev *PIIX4_dev,
155                        const struct pci_device_id *id)
156 {
157         unsigned char temp;
158         unsigned short piix4_smba;
159 
160         if ((PIIX4_dev->vendor == PCI_VENDOR_ID_SERVERWORKS) &&
161             (PIIX4_dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5))
162                 srvrworks_csb5_delay = 1;
163 
164         /* On some motherboards, it was reported that accessing the SMBus
165            caused severe hardware problems */
166         if (dmi_check_system(piix4_dmi_blacklist)) {
167                 dev_err(&PIIX4_dev->dev,
168                         "Accessing the SMBus on this system is unsafe!\n");
169                 return -EPERM;
170         }
171 
172         /* Don't access SMBus on IBM systems which get corrupted eeproms */
173         if (dmi_check_system(piix4_dmi_ibm) &&
174                         PIIX4_dev->vendor == PCI_VENDOR_ID_INTEL) {
175                 dev_err(&PIIX4_dev->dev, "IBM system detected; this module "
176                         "may corrupt your serial eeprom! Refusing to load "
177                         "module!\n");
178                 return -EPERM;
179         }
180 
181         /* Determine the address of the SMBus areas */
182         if (force_addr) {
183                 piix4_smba = force_addr & 0xfff0;
184                 force = 0;
185         } else {
186                 pci_read_config_word(PIIX4_dev, SMBBA, &piix4_smba);
187                 piix4_smba &= 0xfff0;
188                 if(piix4_smba == 0) {
189                         dev_err(&PIIX4_dev->dev, "SMBus base address "
190                                 "uninitialized - upgrade BIOS or use "
191                                 "force_addr=0xaddr\n");
192                         return -ENODEV;
193                 }
194         }
195 
196         if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
197                 return -ENODEV;
198 
199         if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
200                 dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
201                         piix4_smba);
202                 return -EBUSY;
203         }
204 
205         pci_read_config_byte(PIIX4_dev, SMBHSTCFG, &temp);
206 
207         /* If force_addr is set, we program the new address here. Just to make
208            sure, we disable the PIIX4 first. */
209         if (force_addr) {
210                 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp & 0xfe);
211                 pci_write_config_word(PIIX4_dev, SMBBA, piix4_smba);
212                 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp | 0x01);
213                 dev_info(&PIIX4_dev->dev, "WARNING: SMBus interface set to "
214                         "new address %04x!\n", piix4_smba);
215         } else if ((temp & 1) == 0) {
216                 if (force) {
217                         /* This should never need to be done, but has been
218                          * noted that many Dell machines have the SMBus
219                          * interface on the PIIX4 disabled!? NOTE: This assumes
220                          * I/O space and other allocations WERE done by the
221                          * Bios!  Don't complain if your hardware does weird
222                          * things after enabling this. :') Check for Bios
223                          * updates before resorting to this.
224                          */
225                         pci_write_config_byte(PIIX4_dev, SMBHSTCFG,
226                                               temp | 1);
227                         dev_notice(&PIIX4_dev->dev,
228                                    "WARNING: SMBus interface has been FORCEFULLY ENABLED!\n");
229                 } else {
230                         dev_err(&PIIX4_dev->dev,
231                                 "SMBus Host Controller not enabled!\n");
232                         release_region(piix4_smba, SMBIOSIZE);
233                         return -ENODEV;
234                 }
235         }
236 
237         if (((temp & 0x0E) == 8) || ((temp & 0x0E) == 2))
238                 dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus\n");
239         else if ((temp & 0x0E) == 0)
240                 dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus\n");
241         else
242                 dev_err(&PIIX4_dev->dev, "Illegal Interrupt configuration "
243                         "(or code out of date)!\n");
244 
245         pci_read_config_byte(PIIX4_dev, SMBREV, &temp);
246         dev_info(&PIIX4_dev->dev,
247                  "SMBus Host Controller at 0x%x, revision %d\n",
248                  piix4_smba, temp);
249 
250         return piix4_smba;
251 }
252 
253 static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
254                              const struct pci_device_id *id, u8 aux)
255 {
256         unsigned short piix4_smba;
257         u8 smba_en_lo, smba_en_hi, smb_en, smb_en_status;
258         u8 i2ccfg, i2ccfg_offset = 0x10;
259 
260         /* SB800 and later SMBus does not support forcing address */
261         if (force || force_addr) {
262                 dev_err(&PIIX4_dev->dev, "SMBus does not support "
263                         "forcing address!\n");
264                 return -EINVAL;
265         }
266 
267         /* Determine the address of the SMBus areas */
268         if ((PIIX4_dev->vendor == PCI_VENDOR_ID_AMD &&
269              PIIX4_dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS &&
270              PIIX4_dev->revision >= 0x41) ||
271             (PIIX4_dev->vendor == PCI_VENDOR_ID_AMD &&
272              PIIX4_dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS &&
273              PIIX4_dev->revision >= 0x49))
274                 smb_en = 0x00;
275         else
276                 smb_en = (aux) ? 0x28 : 0x2c;
277 
278         mutex_lock(&piix4_mutex_sb800);
279         outb_p(smb_en, SB800_PIIX4_SMB_IDX);
280         smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
281         outb_p(smb_en + 1, SB800_PIIX4_SMB_IDX);
282         smba_en_hi = inb_p(SB800_PIIX4_SMB_IDX + 1);
283         mutex_unlock(&piix4_mutex_sb800);
284 
285         if (!smb_en) {
286                 smb_en_status = smba_en_lo & 0x10;
287                 piix4_smba = smba_en_hi << 8;
288                 if (aux)
289                         piix4_smba |= 0x20;
290         } else {
291                 smb_en_status = smba_en_lo & 0x01;
292                 piix4_smba = ((smba_en_hi << 8) | smba_en_lo) & 0xffe0;
293         }
294 
295         if (!smb_en_status) {
296                 dev_err(&PIIX4_dev->dev,
297                         "SMBus Host Controller not enabled!\n");
298                 return -ENODEV;
299         }
300 
301         if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
302                 return -ENODEV;
303 
304         if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
305                 dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
306                         piix4_smba);
307                 return -EBUSY;
308         }
309 
310         /* Aux SMBus does not support IRQ information */
311         if (aux) {
312                 dev_info(&PIIX4_dev->dev,
313                          "Auxiliary SMBus Host Controller at 0x%x\n",
314                          piix4_smba);
315                 return piix4_smba;
316         }
317 
318         /* Request the SMBus I2C bus config region */
319         if (!request_region(piix4_smba + i2ccfg_offset, 1, "i2ccfg")) {
320                 dev_err(&PIIX4_dev->dev, "SMBus I2C bus config region "
321                         "0x%x already in use!\n", piix4_smba + i2ccfg_offset);
322                 release_region(piix4_smba, SMBIOSIZE);
323                 return -EBUSY;
324         }
325         i2ccfg = inb_p(piix4_smba + i2ccfg_offset);
326         release_region(piix4_smba + i2ccfg_offset, 1);
327 
328         if (i2ccfg & 1)
329                 dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus\n");
330         else
331                 dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus\n");
332 
333         dev_info(&PIIX4_dev->dev,
334                  "SMBus Host Controller at 0x%x, revision %d\n",
335                  piix4_smba, i2ccfg >> 4);
336 
337         return piix4_smba;
338 }
339 
340 static int piix4_setup_aux(struct pci_dev *PIIX4_dev,
341                            const struct pci_device_id *id,
342                            unsigned short base_reg_addr)
343 {
344         /* Set up auxiliary SMBus controllers found on some
345          * AMD chipsets e.g. SP5100 (SB700 derivative) */
346 
347         unsigned short piix4_smba;
348 
349         /* Read address of auxiliary SMBus controller */
350         pci_read_config_word(PIIX4_dev, base_reg_addr, &piix4_smba);
351         if ((piix4_smba & 1) == 0) {
352                 dev_dbg(&PIIX4_dev->dev,
353                         "Auxiliary SMBus controller not enabled\n");
354                 return -ENODEV;
355         }
356 
357         piix4_smba &= 0xfff0;
358         if (piix4_smba == 0) {
359                 dev_dbg(&PIIX4_dev->dev,
360                         "Auxiliary SMBus base address uninitialized\n");
361                 return -ENODEV;
362         }
363 
364         if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
365                 return -ENODEV;
366 
367         if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
368                 dev_err(&PIIX4_dev->dev, "Auxiliary SMBus region 0x%x "
369                         "already in use!\n", piix4_smba);
370                 return -EBUSY;
371         }
372 
373         dev_info(&PIIX4_dev->dev,
374                  "Auxiliary SMBus Host Controller at 0x%x\n",
375                  piix4_smba);
376 
377         return piix4_smba;
378 }
379 
380 static int piix4_transaction(struct i2c_adapter *piix4_adapter)
381 {
382         struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(piix4_adapter);
383         unsigned short piix4_smba = adapdata->smba;
384         int temp;
385         int result = 0;
386         int timeout = 0;
387 
388         dev_dbg(&piix4_adapter->dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
389                 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
390                 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
391                 inb_p(SMBHSTDAT1));
392 
393         /* Make sure the SMBus host is ready to start transmitting */
394         if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
395                 dev_dbg(&piix4_adapter->dev, "SMBus busy (%02x). "
396                         "Resetting...\n", temp);
397                 outb_p(temp, SMBHSTSTS);
398                 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
399                         dev_err(&piix4_adapter->dev, "Failed! (%02x)\n", temp);
400                         return -EBUSY;
401                 } else {
402                         dev_dbg(&piix4_adapter->dev, "Successful!\n");
403                 }
404         }
405 
406         /* start the transaction by setting bit 6 */
407         outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT);
408 
409         /* We will always wait for a fraction of a second! (See PIIX4 docs errata) */
410         if (srvrworks_csb5_delay) /* Extra delay for SERVERWORKS_CSB5 */
411                 msleep(2);
412         else
413                 msleep(1);
414 
415         while ((++timeout < MAX_TIMEOUT) &&
416                ((temp = inb_p(SMBHSTSTS)) & 0x01))
417                 msleep(1);
418 
419         /* If the SMBus is still busy, we give up */
420         if (timeout == MAX_TIMEOUT) {
421                 dev_err(&piix4_adapter->dev, "SMBus Timeout!\n");
422                 result = -ETIMEDOUT;
423         }
424 
425         if (temp & 0x10) {
426                 result = -EIO;
427                 dev_err(&piix4_adapter->dev, "Error: Failed bus transaction\n");
428         }
429 
430         if (temp & 0x08) {
431                 result = -EIO;
432                 dev_dbg(&piix4_adapter->dev, "Bus collision! SMBus may be "
433                         "locked until next hard reset. (sorry!)\n");
434                 /* Clock stops and slave is stuck in mid-transmission */
435         }
436 
437         if (temp & 0x04) {
438                 result = -ENXIO;
439                 dev_dbg(&piix4_adapter->dev, "Error: no response!\n");
440         }
441 
442         if (inb_p(SMBHSTSTS) != 0x00)
443                 outb_p(inb(SMBHSTSTS), SMBHSTSTS);
444 
445         if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
446                 dev_err(&piix4_adapter->dev, "Failed reset at end of "
447                         "transaction (%02x)\n", temp);
448         }
449         dev_dbg(&piix4_adapter->dev, "Transaction (post): CNT=%02x, CMD=%02x, "
450                 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
451                 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
452                 inb_p(SMBHSTDAT1));
453         return result;
454 }
455 
456 /* Return negative errno on error. */
457 static s32 piix4_access(struct i2c_adapter * adap, u16 addr,
458                  unsigned short flags, char read_write,
459                  u8 command, int size, union i2c_smbus_data * data)
460 {
461         struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
462         unsigned short piix4_smba = adapdata->smba;
463         int i, len;
464         int status;
465 
466         switch (size) {
467         case I2C_SMBUS_QUICK:
468                 outb_p((addr << 1) | read_write,
469                        SMBHSTADD);
470                 size = PIIX4_QUICK;
471                 break;
472         case I2C_SMBUS_BYTE:
473                 outb_p((addr << 1) | read_write,
474                        SMBHSTADD);
475                 if (read_write == I2C_SMBUS_WRITE)
476                         outb_p(command, SMBHSTCMD);
477                 size = PIIX4_BYTE;
478                 break;
479         case I2C_SMBUS_BYTE_DATA:
480                 outb_p((addr << 1) | read_write,
481                        SMBHSTADD);
482                 outb_p(command, SMBHSTCMD);
483                 if (read_write == I2C_SMBUS_WRITE)
484                         outb_p(data->byte, SMBHSTDAT0);
485                 size = PIIX4_BYTE_DATA;
486                 break;
487         case I2C_SMBUS_WORD_DATA:
488                 outb_p((addr << 1) | read_write,
489                        SMBHSTADD);
490                 outb_p(command, SMBHSTCMD);
491                 if (read_write == I2C_SMBUS_WRITE) {
492                         outb_p(data->word & 0xff, SMBHSTDAT0);
493                         outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
494                 }
495                 size = PIIX4_WORD_DATA;
496                 break;
497         case I2C_SMBUS_BLOCK_DATA:
498                 outb_p((addr << 1) | read_write,
499                        SMBHSTADD);
500                 outb_p(command, SMBHSTCMD);
501                 if (read_write == I2C_SMBUS_WRITE) {
502                         len = data->block[0];
503                         if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
504                                 return -EINVAL;
505                         outb_p(len, SMBHSTDAT0);
506                         inb_p(SMBHSTCNT);       /* Reset SMBBLKDAT */
507                         for (i = 1; i <= len; i++)
508                                 outb_p(data->block[i], SMBBLKDAT);
509                 }
510                 size = PIIX4_BLOCK_DATA;
511                 break;
512         default:
513                 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
514                 return -EOPNOTSUPP;
515         }
516 
517         outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);
518 
519         status = piix4_transaction(adap);
520         if (status)
521                 return status;
522 
523         if ((read_write == I2C_SMBUS_WRITE) || (size == PIIX4_QUICK))
524                 return 0;
525 
526 
527         switch (size) {
528         case PIIX4_BYTE:
529         case PIIX4_BYTE_DATA:
530                 data->byte = inb_p(SMBHSTDAT0);
531                 break;
532         case PIIX4_WORD_DATA:
533                 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
534                 break;
535         case PIIX4_BLOCK_DATA:
536                 data->block[0] = inb_p(SMBHSTDAT0);
537                 if (data->block[0] == 0 || data->block[0] > I2C_SMBUS_BLOCK_MAX)
538                         return -EPROTO;
539                 inb_p(SMBHSTCNT);       /* Reset SMBBLKDAT */
540                 for (i = 1; i <= data->block[0]; i++)
541                         data->block[i] = inb_p(SMBBLKDAT);
542                 break;
543         }
544         return 0;
545 }
546 
547 /*
548  * Handles access to multiple SMBus ports on the SB800.
549  * The port is selected by bits 2:1 of the smb_en register (0x2c).
550  * Returns negative errno on error.
551  *
552  * Note: The selected port must be returned to the initial selection to avoid
553  * problems on certain systems.
554  */
555 static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
556                  unsigned short flags, char read_write,
557                  u8 command, int size, union i2c_smbus_data *data)
558 {
559         struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
560         u8 smba_en_lo;
561         u8 port;
562         int retval;
563 
564         mutex_lock(&piix4_mutex_sb800);
565 
566         outb_p(SB800_PIIX4_PORT_IDX, SB800_PIIX4_SMB_IDX);
567         smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
568 
569         port = adapdata->port;
570         if ((smba_en_lo & SB800_PIIX4_PORT_IDX_MASK) != (port << 1))
571                 outb_p((smba_en_lo & ~SB800_PIIX4_PORT_IDX_MASK) | (port << 1),
572                        SB800_PIIX4_SMB_IDX + 1);
573 
574         retval = piix4_access(adap, addr, flags, read_write,
575                               command, size, data);
576 
577         outb_p(smba_en_lo, SB800_PIIX4_SMB_IDX + 1);
578 
579         mutex_unlock(&piix4_mutex_sb800);
580 
581         return retval;
582 }
583 
584 static u32 piix4_func(struct i2c_adapter *adapter)
585 {
586         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
587             I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
588             I2C_FUNC_SMBUS_BLOCK_DATA;
589 }
590 
591 static const struct i2c_algorithm smbus_algorithm = {
592         .smbus_xfer     = piix4_access,
593         .functionality  = piix4_func,
594 };
595 
596 static const struct i2c_algorithm piix4_smbus_algorithm_sb800 = {
597         .smbus_xfer     = piix4_access_sb800,
598         .functionality  = piix4_func,
599 };
600 
601 static const struct pci_device_id piix4_ids[] = {
602         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3) },
603         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443MX_3) },
604         { PCI_DEVICE(PCI_VENDOR_ID_EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_3) },
605         { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP200_SMBUS) },
606         { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP300_SMBUS) },
607         { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS) },
608         { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS) },
609         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS) },
610         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_KERNCZ_SMBUS) },
611         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
612                      PCI_DEVICE_ID_SERVERWORKS_OSB4) },
613         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
614                      PCI_DEVICE_ID_SERVERWORKS_CSB5) },
615         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
616                      PCI_DEVICE_ID_SERVERWORKS_CSB6) },
617         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
618                      PCI_DEVICE_ID_SERVERWORKS_HT1000SB) },
619         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
620                      PCI_DEVICE_ID_SERVERWORKS_HT1100LD) },
621         { 0, }
622 };
623 
624 MODULE_DEVICE_TABLE (pci, piix4_ids);
625 
626 static struct i2c_adapter *piix4_main_adapters[PIIX4_MAX_ADAPTERS];
627 static struct i2c_adapter *piix4_aux_adapter;
628 
629 static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba,
630                              bool sb800_main, unsigned short port,
631                              const char *name, struct i2c_adapter **padap)
632 {
633         struct i2c_adapter *adap;
634         struct i2c_piix4_adapdata *adapdata;
635         int retval;
636 
637         adap = kzalloc(sizeof(*adap), GFP_KERNEL);
638         if (adap == NULL) {
639                 release_region(smba, SMBIOSIZE);
640                 return -ENOMEM;
641         }
642 
643         adap->owner = THIS_MODULE;
644         adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
645         adap->algo = sb800_main ? &piix4_smbus_algorithm_sb800
646                                 : &smbus_algorithm;
647 
648         adapdata = kzalloc(sizeof(*adapdata), GFP_KERNEL);
649         if (adapdata == NULL) {
650                 kfree(adap);
651                 release_region(smba, SMBIOSIZE);
652                 return -ENOMEM;
653         }
654 
655         adapdata->smba = smba;
656         adapdata->sb800_main = sb800_main;
657         adapdata->port = port;
658 
659         /* set up the sysfs linkage to our parent device */
660         adap->dev.parent = &dev->dev;
661 
662         snprintf(adap->name, sizeof(adap->name),
663                 "SMBus PIIX4 adapter%s at %04x", name, smba);
664 
665         i2c_set_adapdata(adap, adapdata);
666 
667         retval = i2c_add_adapter(adap);
668         if (retval) {
669                 dev_err(&dev->dev, "Couldn't register adapter!\n");
670                 kfree(adapdata);
671                 kfree(adap);
672                 release_region(smba, SMBIOSIZE);
673                 return retval;
674         }
675 
676         *padap = adap;
677         return 0;
678 }
679 
680 static int piix4_add_adapters_sb800(struct pci_dev *dev, unsigned short smba)
681 {
682         struct i2c_piix4_adapdata *adapdata;
683         int port;
684         int retval;
685 
686         for (port = 0; port < PIIX4_MAX_ADAPTERS; port++) {
687                 retval = piix4_add_adapter(dev, smba, true, port,
688                                            piix4_main_port_names_sb800[port],
689                                            &piix4_main_adapters[port]);
690                 if (retval < 0)
691                         goto error;
692         }
693 
694         return retval;
695 
696 error:
697         dev_err(&dev->dev,
698                 "Error setting up SB800 adapters. Unregistering!\n");
699         while (--port >= 0) {
700                 adapdata = i2c_get_adapdata(piix4_main_adapters[port]);
701                 if (adapdata->smba) {
702                         i2c_del_adapter(piix4_main_adapters[port]);
703                         kfree(adapdata);
704                         kfree(piix4_main_adapters[port]);
705                         piix4_main_adapters[port] = NULL;
706                 }
707         }
708 
709         return retval;
710 }
711 
712 static int piix4_probe(struct pci_dev *dev, const struct pci_device_id *id)
713 {
714         int retval;
715         bool is_sb800 = false;
716 
717         if ((dev->vendor == PCI_VENDOR_ID_ATI &&
718              dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
719              dev->revision >= 0x40) ||
720             dev->vendor == PCI_VENDOR_ID_AMD) {
721                 is_sb800 = true;
722 
723                 if (!request_region(SB800_PIIX4_SMB_IDX, 2, "smba_idx")) {
724                         dev_err(&dev->dev,
725                         "SMBus base address index region 0x%x already in use!\n",
726                         SB800_PIIX4_SMB_IDX);
727                         return -EBUSY;
728                 }
729 
730                 /* base address location etc changed in SB800 */
731                 retval = piix4_setup_sb800(dev, id, 0);
732                 if (retval < 0) {
733                         release_region(SB800_PIIX4_SMB_IDX, 2);
734                         return retval;
735                 }
736 
737                 /*
738                  * Try to register multiplexed main SMBus adapter,
739                  * give up if we can't
740                  */
741                 retval = piix4_add_adapters_sb800(dev, retval);
742                 if (retval < 0) {
743                         release_region(SB800_PIIX4_SMB_IDX, 2);
744                         return retval;
745                 }
746         } else {
747                 retval = piix4_setup(dev, id);
748                 if (retval < 0)
749                         return retval;
750 
751                 /* Try to register main SMBus adapter, give up if we can't */
752                 retval = piix4_add_adapter(dev, retval, false, 0, "",
753                                            &piix4_main_adapters[0]);
754                 if (retval < 0)
755                         return retval;
756         }
757 
758         /* Check for auxiliary SMBus on some AMD chipsets */
759         retval = -ENODEV;
760 
761         if (dev->vendor == PCI_VENDOR_ID_ATI &&
762             dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS) {
763                 if (dev->revision < 0x40) {
764                         retval = piix4_setup_aux(dev, id, 0x58);
765                 } else {
766                         /* SB800 added aux bus too */
767                         retval = piix4_setup_sb800(dev, id, 1);
768                 }
769         }
770 
771         if (dev->vendor == PCI_VENDOR_ID_AMD &&
772             dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS) {
773                 retval = piix4_setup_sb800(dev, id, 1);
774         }
775 
776         if (retval > 0) {
777                 /* Try to add the aux adapter if it exists,
778                  * piix4_add_adapter will clean up if this fails */
779                 piix4_add_adapter(dev, retval, false, 0,
780                                   is_sb800 ? piix4_aux_port_name_sb800 : "",
781                                   &piix4_aux_adapter);
782         }
783 
784         return 0;
785 }
786 
787 static void piix4_adap_remove(struct i2c_adapter *adap)
788 {
789         struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
790 
791         if (adapdata->smba) {
792                 i2c_del_adapter(adap);
793                 if (adapdata->port == 0) {
794                         release_region(adapdata->smba, SMBIOSIZE);
795                         if (adapdata->sb800_main)
796                                 release_region(SB800_PIIX4_SMB_IDX, 2);
797                 }
798                 kfree(adapdata);
799                 kfree(adap);
800         }
801 }
802 
803 static void piix4_remove(struct pci_dev *dev)
804 {
805         int port = PIIX4_MAX_ADAPTERS;
806 
807         while (--port >= 0) {
808                 if (piix4_main_adapters[port]) {
809                         piix4_adap_remove(piix4_main_adapters[port]);
810                         piix4_main_adapters[port] = NULL;
811                 }
812         }
813 
814         if (piix4_aux_adapter) {
815                 piix4_adap_remove(piix4_aux_adapter);
816                 piix4_aux_adapter = NULL;
817         }
818 }
819 
820 static struct pci_driver piix4_driver = {
821         .name           = "piix4_smbus",
822         .id_table       = piix4_ids,
823         .probe          = piix4_probe,
824         .remove         = piix4_remove,
825 };
826 
827 module_pci_driver(piix4_driver);
828 
829 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
830                 "Philip Edelbrock <phil@netroedge.com>");
831 MODULE_DESCRIPTION("PIIX4 SMBus driver");
832 MODULE_LICENSE("GPL");
833 

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