Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
[sfrench/cifs-2.6.git] / 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       9
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 #define KERNCZ_IMC_IDX                  0x3e
89 #define KERNCZ_IMC_DATA                 0x3f
90
91 /*
92  * SB800 port is selected by bits 2:1 of the smb_en register (0x2c)
93  * or the smb_sel register (0x2e), depending on bit 0 of register 0x2f.
94  * Hudson-2/Bolton port is always selected by bits 2:1 of register 0x2f.
95  */
96 #define SB800_PIIX4_PORT_IDX            0x2c
97 #define SB800_PIIX4_PORT_IDX_ALT        0x2e
98 #define SB800_PIIX4_PORT_IDX_SEL        0x2f
99 #define SB800_PIIX4_PORT_IDX_MASK       0x06
100 #define SB800_PIIX4_PORT_IDX_SHIFT      1
101
102 /* On kerncz, SmBus0Sel is at bit 20:19 of PMx00 DecodeEn */
103 #define SB800_PIIX4_PORT_IDX_KERNCZ             0x02
104 #define SB800_PIIX4_PORT_IDX_MASK_KERNCZ        0x18
105 #define SB800_PIIX4_PORT_IDX_SHIFT_KERNCZ       3
106
107 /* insmod parameters */
108
109 /* If force is set to anything different from 0, we forcibly enable the
110    PIIX4. DANGEROUS! */
111 static int force;
112 module_param (force, int, 0);
113 MODULE_PARM_DESC(force, "Forcibly enable the PIIX4. DANGEROUS!");
114
115 /* If force_addr is set to anything different from 0, we forcibly enable
116    the PIIX4 at the given address. VERY DANGEROUS! */
117 static int force_addr;
118 module_param_hw(force_addr, int, ioport, 0);
119 MODULE_PARM_DESC(force_addr,
120                  "Forcibly enable the PIIX4 at the given address. "
121                  "EXTREMELY DANGEROUS!");
122
123 static int srvrworks_csb5_delay;
124 static struct pci_driver piix4_driver;
125
126 static const struct dmi_system_id piix4_dmi_blacklist[] = {
127         {
128                 .ident = "Sapphire AM2RD790",
129                 .matches = {
130                         DMI_MATCH(DMI_BOARD_VENDOR, "SAPPHIRE Inc."),
131                         DMI_MATCH(DMI_BOARD_NAME, "PC-AM2RD790"),
132                 },
133         },
134         {
135                 .ident = "DFI Lanparty UT 790FX",
136                 .matches = {
137                         DMI_MATCH(DMI_BOARD_VENDOR, "DFI Inc."),
138                         DMI_MATCH(DMI_BOARD_NAME, "LP UT 790FX"),
139                 },
140         },
141         { }
142 };
143
144 /* The IBM entry is in a separate table because we only check it
145    on Intel-based systems */
146 static const struct dmi_system_id piix4_dmi_ibm[] = {
147         {
148                 .ident = "IBM",
149                 .matches = { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
150         },
151         { },
152 };
153
154 /*
155  * SB800 globals
156  * piix4_mutex_sb800 protects piix4_port_sel_sb800 and the pair
157  * of I/O ports at SB800_PIIX4_SMB_IDX.
158  */
159 static DEFINE_MUTEX(piix4_mutex_sb800);
160 static u8 piix4_port_sel_sb800;
161 static u8 piix4_port_mask_sb800;
162 static u8 piix4_port_shift_sb800;
163 static const char *piix4_main_port_names_sb800[PIIX4_MAX_ADAPTERS] = {
164         " port 0", " port 2", " port 3", " port 4"
165 };
166 static const char *piix4_aux_port_name_sb800 = " port 1";
167
168 struct i2c_piix4_adapdata {
169         unsigned short smba;
170
171         /* SB800 */
172         bool sb800_main;
173         bool notify_imc;
174         u8 port;                /* Port number, shifted */
175 };
176
177 static int piix4_setup(struct pci_dev *PIIX4_dev,
178                        const struct pci_device_id *id)
179 {
180         unsigned char temp;
181         unsigned short piix4_smba;
182
183         if ((PIIX4_dev->vendor == PCI_VENDOR_ID_SERVERWORKS) &&
184             (PIIX4_dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5))
185                 srvrworks_csb5_delay = 1;
186
187         /* On some motherboards, it was reported that accessing the SMBus
188            caused severe hardware problems */
189         if (dmi_check_system(piix4_dmi_blacklist)) {
190                 dev_err(&PIIX4_dev->dev,
191                         "Accessing the SMBus on this system is unsafe!\n");
192                 return -EPERM;
193         }
194
195         /* Don't access SMBus on IBM systems which get corrupted eeproms */
196         if (dmi_check_system(piix4_dmi_ibm) &&
197                         PIIX4_dev->vendor == PCI_VENDOR_ID_INTEL) {
198                 dev_err(&PIIX4_dev->dev, "IBM system detected; this module "
199                         "may corrupt your serial eeprom! Refusing to load "
200                         "module!\n");
201                 return -EPERM;
202         }
203
204         /* Determine the address of the SMBus areas */
205         if (force_addr) {
206                 piix4_smba = force_addr & 0xfff0;
207                 force = 0;
208         } else {
209                 pci_read_config_word(PIIX4_dev, SMBBA, &piix4_smba);
210                 piix4_smba &= 0xfff0;
211                 if(piix4_smba == 0) {
212                         dev_err(&PIIX4_dev->dev, "SMBus base address "
213                                 "uninitialized - upgrade BIOS or use "
214                                 "force_addr=0xaddr\n");
215                         return -ENODEV;
216                 }
217         }
218
219         if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
220                 return -ENODEV;
221
222         if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
223                 dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
224                         piix4_smba);
225                 return -EBUSY;
226         }
227
228         pci_read_config_byte(PIIX4_dev, SMBHSTCFG, &temp);
229
230         /* If force_addr is set, we program the new address here. Just to make
231            sure, we disable the PIIX4 first. */
232         if (force_addr) {
233                 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp & 0xfe);
234                 pci_write_config_word(PIIX4_dev, SMBBA, piix4_smba);
235                 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp | 0x01);
236                 dev_info(&PIIX4_dev->dev, "WARNING: SMBus interface set to "
237                         "new address %04x!\n", piix4_smba);
238         } else if ((temp & 1) == 0) {
239                 if (force) {
240                         /* This should never need to be done, but has been
241                          * noted that many Dell machines have the SMBus
242                          * interface on the PIIX4 disabled!? NOTE: This assumes
243                          * I/O space and other allocations WERE done by the
244                          * Bios!  Don't complain if your hardware does weird
245                          * things after enabling this. :') Check for Bios
246                          * updates before resorting to this.
247                          */
248                         pci_write_config_byte(PIIX4_dev, SMBHSTCFG,
249                                               temp | 1);
250                         dev_notice(&PIIX4_dev->dev,
251                                    "WARNING: SMBus interface has been FORCEFULLY ENABLED!\n");
252                 } else {
253                         dev_err(&PIIX4_dev->dev,
254                                 "SMBus Host Controller not enabled!\n");
255                         release_region(piix4_smba, SMBIOSIZE);
256                         return -ENODEV;
257                 }
258         }
259
260         if (((temp & 0x0E) == 8) || ((temp & 0x0E) == 2))
261                 dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus\n");
262         else if ((temp & 0x0E) == 0)
263                 dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus\n");
264         else
265                 dev_err(&PIIX4_dev->dev, "Illegal Interrupt configuration "
266                         "(or code out of date)!\n");
267
268         pci_read_config_byte(PIIX4_dev, SMBREV, &temp);
269         dev_info(&PIIX4_dev->dev,
270                  "SMBus Host Controller at 0x%x, revision %d\n",
271                  piix4_smba, temp);
272
273         return piix4_smba;
274 }
275
276 static int piix4_setup_sb800(struct pci_dev *PIIX4_dev,
277                              const struct pci_device_id *id, u8 aux)
278 {
279         unsigned short piix4_smba;
280         u8 smba_en_lo, smba_en_hi, smb_en, smb_en_status, port_sel;
281         u8 i2ccfg, i2ccfg_offset = 0x10;
282
283         /* SB800 and later SMBus does not support forcing address */
284         if (force || force_addr) {
285                 dev_err(&PIIX4_dev->dev, "SMBus does not support "
286                         "forcing address!\n");
287                 return -EINVAL;
288         }
289
290         /* Determine the address of the SMBus areas */
291         if ((PIIX4_dev->vendor == PCI_VENDOR_ID_AMD &&
292              PIIX4_dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS &&
293              PIIX4_dev->revision >= 0x41) ||
294             (PIIX4_dev->vendor == PCI_VENDOR_ID_AMD &&
295              PIIX4_dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS &&
296              PIIX4_dev->revision >= 0x49))
297                 smb_en = 0x00;
298         else
299                 smb_en = (aux) ? 0x28 : 0x2c;
300
301         mutex_lock(&piix4_mutex_sb800);
302         outb_p(smb_en, SB800_PIIX4_SMB_IDX);
303         smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
304         outb_p(smb_en + 1, SB800_PIIX4_SMB_IDX);
305         smba_en_hi = inb_p(SB800_PIIX4_SMB_IDX + 1);
306         mutex_unlock(&piix4_mutex_sb800);
307
308         if (!smb_en) {
309                 smb_en_status = smba_en_lo & 0x10;
310                 piix4_smba = smba_en_hi << 8;
311                 if (aux)
312                         piix4_smba |= 0x20;
313         } else {
314                 smb_en_status = smba_en_lo & 0x01;
315                 piix4_smba = ((smba_en_hi << 8) | smba_en_lo) & 0xffe0;
316         }
317
318         if (!smb_en_status) {
319                 dev_err(&PIIX4_dev->dev,
320                         "SMBus Host Controller not enabled!\n");
321                 return -ENODEV;
322         }
323
324         if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
325                 return -ENODEV;
326
327         if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
328                 dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
329                         piix4_smba);
330                 return -EBUSY;
331         }
332
333         /* Aux SMBus does not support IRQ information */
334         if (aux) {
335                 dev_info(&PIIX4_dev->dev,
336                          "Auxiliary SMBus Host Controller at 0x%x\n",
337                          piix4_smba);
338                 return piix4_smba;
339         }
340
341         /* Request the SMBus I2C bus config region */
342         if (!request_region(piix4_smba + i2ccfg_offset, 1, "i2ccfg")) {
343                 dev_err(&PIIX4_dev->dev, "SMBus I2C bus config region "
344                         "0x%x already in use!\n", piix4_smba + i2ccfg_offset);
345                 release_region(piix4_smba, SMBIOSIZE);
346                 return -EBUSY;
347         }
348         i2ccfg = inb_p(piix4_smba + i2ccfg_offset);
349         release_region(piix4_smba + i2ccfg_offset, 1);
350
351         if (i2ccfg & 1)
352                 dev_dbg(&PIIX4_dev->dev, "Using IRQ for SMBus\n");
353         else
354                 dev_dbg(&PIIX4_dev->dev, "Using SMI# for SMBus\n");
355
356         dev_info(&PIIX4_dev->dev,
357                  "SMBus Host Controller at 0x%x, revision %d\n",
358                  piix4_smba, i2ccfg >> 4);
359
360         /* Find which register is used for port selection */
361         if (PIIX4_dev->vendor == PCI_VENDOR_ID_AMD) {
362                 switch (PIIX4_dev->device) {
363                 case PCI_DEVICE_ID_AMD_KERNCZ_SMBUS:
364                         piix4_port_sel_sb800 = SB800_PIIX4_PORT_IDX_KERNCZ;
365                         piix4_port_mask_sb800 = SB800_PIIX4_PORT_IDX_MASK_KERNCZ;
366                         piix4_port_shift_sb800 = SB800_PIIX4_PORT_IDX_SHIFT_KERNCZ;
367                         break;
368                 case PCI_DEVICE_ID_AMD_HUDSON2_SMBUS:
369                 default:
370                         piix4_port_sel_sb800 = SB800_PIIX4_PORT_IDX_ALT;
371                         piix4_port_mask_sb800 = SB800_PIIX4_PORT_IDX_MASK;
372                         piix4_port_shift_sb800 = SB800_PIIX4_PORT_IDX_SHIFT;
373                         break;
374                 }
375         } else {
376                 mutex_lock(&piix4_mutex_sb800);
377                 outb_p(SB800_PIIX4_PORT_IDX_SEL, SB800_PIIX4_SMB_IDX);
378                 port_sel = inb_p(SB800_PIIX4_SMB_IDX + 1);
379                 piix4_port_sel_sb800 = (port_sel & 0x01) ?
380                                        SB800_PIIX4_PORT_IDX_ALT :
381                                        SB800_PIIX4_PORT_IDX;
382                 piix4_port_mask_sb800 = SB800_PIIX4_PORT_IDX_MASK;
383                 piix4_port_shift_sb800 = SB800_PIIX4_PORT_IDX_SHIFT;
384                 mutex_unlock(&piix4_mutex_sb800);
385         }
386
387         dev_info(&PIIX4_dev->dev,
388                  "Using register 0x%02x for SMBus port selection\n",
389                  (unsigned int)piix4_port_sel_sb800);
390
391         return piix4_smba;
392 }
393
394 static int piix4_setup_aux(struct pci_dev *PIIX4_dev,
395                            const struct pci_device_id *id,
396                            unsigned short base_reg_addr)
397 {
398         /* Set up auxiliary SMBus controllers found on some
399          * AMD chipsets e.g. SP5100 (SB700 derivative) */
400
401         unsigned short piix4_smba;
402
403         /* Read address of auxiliary SMBus controller */
404         pci_read_config_word(PIIX4_dev, base_reg_addr, &piix4_smba);
405         if ((piix4_smba & 1) == 0) {
406                 dev_dbg(&PIIX4_dev->dev,
407                         "Auxiliary SMBus controller not enabled\n");
408                 return -ENODEV;
409         }
410
411         piix4_smba &= 0xfff0;
412         if (piix4_smba == 0) {
413                 dev_dbg(&PIIX4_dev->dev,
414                         "Auxiliary SMBus base address uninitialized\n");
415                 return -ENODEV;
416         }
417
418         if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
419                 return -ENODEV;
420
421         if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
422                 dev_err(&PIIX4_dev->dev, "Auxiliary SMBus region 0x%x "
423                         "already in use!\n", piix4_smba);
424                 return -EBUSY;
425         }
426
427         dev_info(&PIIX4_dev->dev,
428                  "Auxiliary SMBus Host Controller at 0x%x\n",
429                  piix4_smba);
430
431         return piix4_smba;
432 }
433
434 static int piix4_transaction(struct i2c_adapter *piix4_adapter)
435 {
436         struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(piix4_adapter);
437         unsigned short piix4_smba = adapdata->smba;
438         int temp;
439         int result = 0;
440         int timeout = 0;
441
442         dev_dbg(&piix4_adapter->dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
443                 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
444                 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
445                 inb_p(SMBHSTDAT1));
446
447         /* Make sure the SMBus host is ready to start transmitting */
448         if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
449                 dev_dbg(&piix4_adapter->dev, "SMBus busy (%02x). "
450                         "Resetting...\n", temp);
451                 outb_p(temp, SMBHSTSTS);
452                 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
453                         dev_err(&piix4_adapter->dev, "Failed! (%02x)\n", temp);
454                         return -EBUSY;
455                 } else {
456                         dev_dbg(&piix4_adapter->dev, "Successful!\n");
457                 }
458         }
459
460         /* start the transaction by setting bit 6 */
461         outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT);
462
463         /* We will always wait for a fraction of a second! (See PIIX4 docs errata) */
464         if (srvrworks_csb5_delay) /* Extra delay for SERVERWORKS_CSB5 */
465                 msleep(2);
466         else
467                 msleep(1);
468
469         while ((++timeout < MAX_TIMEOUT) &&
470                ((temp = inb_p(SMBHSTSTS)) & 0x01))
471                 msleep(1);
472
473         /* If the SMBus is still busy, we give up */
474         if (timeout == MAX_TIMEOUT) {
475                 dev_err(&piix4_adapter->dev, "SMBus Timeout!\n");
476                 result = -ETIMEDOUT;
477         }
478
479         if (temp & 0x10) {
480                 result = -EIO;
481                 dev_err(&piix4_adapter->dev, "Error: Failed bus transaction\n");
482         }
483
484         if (temp & 0x08) {
485                 result = -EIO;
486                 dev_dbg(&piix4_adapter->dev, "Bus collision! SMBus may be "
487                         "locked until next hard reset. (sorry!)\n");
488                 /* Clock stops and slave is stuck in mid-transmission */
489         }
490
491         if (temp & 0x04) {
492                 result = -ENXIO;
493                 dev_dbg(&piix4_adapter->dev, "Error: no response!\n");
494         }
495
496         if (inb_p(SMBHSTSTS) != 0x00)
497                 outb_p(inb(SMBHSTSTS), SMBHSTSTS);
498
499         if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
500                 dev_err(&piix4_adapter->dev, "Failed reset at end of "
501                         "transaction (%02x)\n", temp);
502         }
503         dev_dbg(&piix4_adapter->dev, "Transaction (post): CNT=%02x, CMD=%02x, "
504                 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
505                 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
506                 inb_p(SMBHSTDAT1));
507         return result;
508 }
509
510 /* Return negative errno on error. */
511 static s32 piix4_access(struct i2c_adapter * adap, u16 addr,
512                  unsigned short flags, char read_write,
513                  u8 command, int size, union i2c_smbus_data * data)
514 {
515         struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
516         unsigned short piix4_smba = adapdata->smba;
517         int i, len;
518         int status;
519
520         switch (size) {
521         case I2C_SMBUS_QUICK:
522                 outb_p((addr << 1) | read_write,
523                        SMBHSTADD);
524                 size = PIIX4_QUICK;
525                 break;
526         case I2C_SMBUS_BYTE:
527                 outb_p((addr << 1) | read_write,
528                        SMBHSTADD);
529                 if (read_write == I2C_SMBUS_WRITE)
530                         outb_p(command, SMBHSTCMD);
531                 size = PIIX4_BYTE;
532                 break;
533         case I2C_SMBUS_BYTE_DATA:
534                 outb_p((addr << 1) | read_write,
535                        SMBHSTADD);
536                 outb_p(command, SMBHSTCMD);
537                 if (read_write == I2C_SMBUS_WRITE)
538                         outb_p(data->byte, SMBHSTDAT0);
539                 size = PIIX4_BYTE_DATA;
540                 break;
541         case I2C_SMBUS_WORD_DATA:
542                 outb_p((addr << 1) | read_write,
543                        SMBHSTADD);
544                 outb_p(command, SMBHSTCMD);
545                 if (read_write == I2C_SMBUS_WRITE) {
546                         outb_p(data->word & 0xff, SMBHSTDAT0);
547                         outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
548                 }
549                 size = PIIX4_WORD_DATA;
550                 break;
551         case I2C_SMBUS_BLOCK_DATA:
552                 outb_p((addr << 1) | read_write,
553                        SMBHSTADD);
554                 outb_p(command, SMBHSTCMD);
555                 if (read_write == I2C_SMBUS_WRITE) {
556                         len = data->block[0];
557                         if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
558                                 return -EINVAL;
559                         outb_p(len, SMBHSTDAT0);
560                         inb_p(SMBHSTCNT);       /* Reset SMBBLKDAT */
561                         for (i = 1; i <= len; i++)
562                                 outb_p(data->block[i], SMBBLKDAT);
563                 }
564                 size = PIIX4_BLOCK_DATA;
565                 break;
566         default:
567                 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
568                 return -EOPNOTSUPP;
569         }
570
571         outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);
572
573         status = piix4_transaction(adap);
574         if (status)
575                 return status;
576
577         if ((read_write == I2C_SMBUS_WRITE) || (size == PIIX4_QUICK))
578                 return 0;
579
580
581         switch (size) {
582         case PIIX4_BYTE:
583         case PIIX4_BYTE_DATA:
584                 data->byte = inb_p(SMBHSTDAT0);
585                 break;
586         case PIIX4_WORD_DATA:
587                 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
588                 break;
589         case PIIX4_BLOCK_DATA:
590                 data->block[0] = inb_p(SMBHSTDAT0);
591                 if (data->block[0] == 0 || data->block[0] > I2C_SMBUS_BLOCK_MAX)
592                         return -EPROTO;
593                 inb_p(SMBHSTCNT);       /* Reset SMBBLKDAT */
594                 for (i = 1; i <= data->block[0]; i++)
595                         data->block[i] = inb_p(SMBBLKDAT);
596                 break;
597         }
598         return 0;
599 }
600
601 static uint8_t piix4_imc_read(uint8_t idx)
602 {
603         outb_p(idx, KERNCZ_IMC_IDX);
604         return inb_p(KERNCZ_IMC_DATA);
605 }
606
607 static void piix4_imc_write(uint8_t idx, uint8_t value)
608 {
609         outb_p(idx, KERNCZ_IMC_IDX);
610         outb_p(value, KERNCZ_IMC_DATA);
611 }
612
613 static int piix4_imc_sleep(void)
614 {
615         int timeout = MAX_TIMEOUT;
616
617         if (!request_muxed_region(KERNCZ_IMC_IDX, 2, "smbus_kerncz_imc"))
618                 return -EBUSY;
619
620         /* clear response register */
621         piix4_imc_write(0x82, 0x00);
622         /* request ownership flag */
623         piix4_imc_write(0x83, 0xB4);
624         /* kick off IMC Mailbox command 96 */
625         piix4_imc_write(0x80, 0x96);
626
627         while (timeout--) {
628                 if (piix4_imc_read(0x82) == 0xfa) {
629                         release_region(KERNCZ_IMC_IDX, 2);
630                         return 0;
631                 }
632                 usleep_range(1000, 2000);
633         }
634
635         release_region(KERNCZ_IMC_IDX, 2);
636         return -ETIMEDOUT;
637 }
638
639 static void piix4_imc_wakeup(void)
640 {
641         int timeout = MAX_TIMEOUT;
642
643         if (!request_muxed_region(KERNCZ_IMC_IDX, 2, "smbus_kerncz_imc"))
644                 return;
645
646         /* clear response register */
647         piix4_imc_write(0x82, 0x00);
648         /* release ownership flag */
649         piix4_imc_write(0x83, 0xB5);
650         /* kick off IMC Mailbox command 96 */
651         piix4_imc_write(0x80, 0x96);
652
653         while (timeout--) {
654                 if (piix4_imc_read(0x82) == 0xfa)
655                         break;
656                 usleep_range(1000, 2000);
657         }
658
659         release_region(KERNCZ_IMC_IDX, 2);
660 }
661
662 /*
663  * Handles access to multiple SMBus ports on the SB800.
664  * The port is selected by bits 2:1 of the smb_en register (0x2c).
665  * Returns negative errno on error.
666  *
667  * Note: The selected port must be returned to the initial selection to avoid
668  * problems on certain systems.
669  */
670 static s32 piix4_access_sb800(struct i2c_adapter *adap, u16 addr,
671                  unsigned short flags, char read_write,
672                  u8 command, int size, union i2c_smbus_data *data)
673 {
674         struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
675         unsigned short piix4_smba = adapdata->smba;
676         int retries = MAX_TIMEOUT;
677         int smbslvcnt;
678         u8 smba_en_lo;
679         u8 port;
680         int retval;
681
682         mutex_lock(&piix4_mutex_sb800);
683
684         /* Request the SMBUS semaphore, avoid conflicts with the IMC */
685         smbslvcnt  = inb_p(SMBSLVCNT);
686         do {
687                 outb_p(smbslvcnt | 0x10, SMBSLVCNT);
688
689                 /* Check the semaphore status */
690                 smbslvcnt  = inb_p(SMBSLVCNT);
691                 if (smbslvcnt & 0x10)
692                         break;
693
694                 usleep_range(1000, 2000);
695         } while (--retries);
696         /* SMBus is still owned by the IMC, we give up */
697         if (!retries) {
698                 mutex_unlock(&piix4_mutex_sb800);
699                 return -EBUSY;
700         }
701
702         /*
703          * Notify the IMC (Integrated Micro Controller) if required.
704          * Among other responsibilities, the IMC is in charge of monitoring
705          * the System fans and temperature sensors, and act accordingly.
706          * All this is done through SMBus and can/will collide
707          * with our transactions if they are long (BLOCK_DATA).
708          * Therefore we need to request the ownership flag during those
709          * transactions.
710          */
711         if ((size == I2C_SMBUS_BLOCK_DATA) && adapdata->notify_imc) {
712                 int ret;
713
714                 ret = piix4_imc_sleep();
715                 switch (ret) {
716                 case -EBUSY:
717                         dev_warn(&adap->dev,
718                                  "IMC base address index region 0x%x already in use.\n",
719                                  KERNCZ_IMC_IDX);
720                         break;
721                 case -ETIMEDOUT:
722                         dev_warn(&adap->dev,
723                                  "Failed to communicate with the IMC.\n");
724                         break;
725                 default:
726                         break;
727                 }
728
729                 /* If IMC communication fails do not retry */
730                 if (ret) {
731                         dev_warn(&adap->dev,
732                                  "Continuing without IMC notification.\n");
733                         adapdata->notify_imc = false;
734                 }
735         }
736
737         outb_p(piix4_port_sel_sb800, SB800_PIIX4_SMB_IDX);
738         smba_en_lo = inb_p(SB800_PIIX4_SMB_IDX + 1);
739
740         port = adapdata->port;
741         if ((smba_en_lo & piix4_port_mask_sb800) != port)
742                 outb_p((smba_en_lo & ~piix4_port_mask_sb800) | port,
743                        SB800_PIIX4_SMB_IDX + 1);
744
745         retval = piix4_access(adap, addr, flags, read_write,
746                               command, size, data);
747
748         outb_p(smba_en_lo, SB800_PIIX4_SMB_IDX + 1);
749
750         /* Release the semaphore */
751         outb_p(smbslvcnt | 0x20, SMBSLVCNT);
752
753         if ((size == I2C_SMBUS_BLOCK_DATA) && adapdata->notify_imc)
754                 piix4_imc_wakeup();
755
756         mutex_unlock(&piix4_mutex_sb800);
757
758         return retval;
759 }
760
761 static u32 piix4_func(struct i2c_adapter *adapter)
762 {
763         return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
764             I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
765             I2C_FUNC_SMBUS_BLOCK_DATA;
766 }
767
768 static const struct i2c_algorithm smbus_algorithm = {
769         .smbus_xfer     = piix4_access,
770         .functionality  = piix4_func,
771 };
772
773 static const struct i2c_algorithm piix4_smbus_algorithm_sb800 = {
774         .smbus_xfer     = piix4_access_sb800,
775         .functionality  = piix4_func,
776 };
777
778 static const struct pci_device_id piix4_ids[] = {
779         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3) },
780         { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443MX_3) },
781         { PCI_DEVICE(PCI_VENDOR_ID_EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_3) },
782         { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP200_SMBUS) },
783         { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP300_SMBUS) },
784         { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS) },
785         { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS) },
786         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS) },
787         { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_KERNCZ_SMBUS) },
788         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
789                      PCI_DEVICE_ID_SERVERWORKS_OSB4) },
790         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
791                      PCI_DEVICE_ID_SERVERWORKS_CSB5) },
792         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
793                      PCI_DEVICE_ID_SERVERWORKS_CSB6) },
794         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
795                      PCI_DEVICE_ID_SERVERWORKS_HT1000SB) },
796         { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
797                      PCI_DEVICE_ID_SERVERWORKS_HT1100LD) },
798         { 0, }
799 };
800
801 MODULE_DEVICE_TABLE (pci, piix4_ids);
802
803 static struct i2c_adapter *piix4_main_adapters[PIIX4_MAX_ADAPTERS];
804 static struct i2c_adapter *piix4_aux_adapter;
805
806 static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba,
807                              bool sb800_main, u8 port, bool notify_imc,
808                              const char *name, struct i2c_adapter **padap)
809 {
810         struct i2c_adapter *adap;
811         struct i2c_piix4_adapdata *adapdata;
812         int retval;
813
814         adap = kzalloc(sizeof(*adap), GFP_KERNEL);
815         if (adap == NULL) {
816                 release_region(smba, SMBIOSIZE);
817                 return -ENOMEM;
818         }
819
820         adap->owner = THIS_MODULE;
821         adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
822         adap->algo = sb800_main ? &piix4_smbus_algorithm_sb800
823                                 : &smbus_algorithm;
824
825         adapdata = kzalloc(sizeof(*adapdata), GFP_KERNEL);
826         if (adapdata == NULL) {
827                 kfree(adap);
828                 release_region(smba, SMBIOSIZE);
829                 return -ENOMEM;
830         }
831
832         adapdata->smba = smba;
833         adapdata->sb800_main = sb800_main;
834         adapdata->port = port << piix4_port_shift_sb800;
835         adapdata->notify_imc = notify_imc;
836
837         /* set up the sysfs linkage to our parent device */
838         adap->dev.parent = &dev->dev;
839
840         snprintf(adap->name, sizeof(adap->name),
841                 "SMBus PIIX4 adapter%s at %04x", name, smba);
842
843         i2c_set_adapdata(adap, adapdata);
844
845         retval = i2c_add_adapter(adap);
846         if (retval) {
847                 kfree(adapdata);
848                 kfree(adap);
849                 release_region(smba, SMBIOSIZE);
850                 return retval;
851         }
852
853         *padap = adap;
854         return 0;
855 }
856
857 static int piix4_add_adapters_sb800(struct pci_dev *dev, unsigned short smba,
858                                     bool notify_imc)
859 {
860         struct i2c_piix4_adapdata *adapdata;
861         int port;
862         int retval;
863
864         for (port = 0; port < PIIX4_MAX_ADAPTERS; port++) {
865                 retval = piix4_add_adapter(dev, smba, true, port, notify_imc,
866                                            piix4_main_port_names_sb800[port],
867                                            &piix4_main_adapters[port]);
868                 if (retval < 0)
869                         goto error;
870         }
871
872         return retval;
873
874 error:
875         dev_err(&dev->dev,
876                 "Error setting up SB800 adapters. Unregistering!\n");
877         while (--port >= 0) {
878                 adapdata = i2c_get_adapdata(piix4_main_adapters[port]);
879                 if (adapdata->smba) {
880                         i2c_del_adapter(piix4_main_adapters[port]);
881                         kfree(adapdata);
882                         kfree(piix4_main_adapters[port]);
883                         piix4_main_adapters[port] = NULL;
884                 }
885         }
886
887         return retval;
888 }
889
890 static int piix4_probe(struct pci_dev *dev, const struct pci_device_id *id)
891 {
892         int retval;
893         bool is_sb800 = false;
894
895         if ((dev->vendor == PCI_VENDOR_ID_ATI &&
896              dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
897              dev->revision >= 0x40) ||
898             dev->vendor == PCI_VENDOR_ID_AMD) {
899                 bool notify_imc = false;
900                 is_sb800 = true;
901
902                 if (!request_region(SB800_PIIX4_SMB_IDX, 2, "smba_idx")) {
903                         dev_err(&dev->dev,
904                         "SMBus base address index region 0x%x already in use!\n",
905                         SB800_PIIX4_SMB_IDX);
906                         return -EBUSY;
907                 }
908
909                 if (dev->vendor == PCI_VENDOR_ID_AMD &&
910                     dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS) {
911                         u8 imc;
912
913                         /*
914                          * Detect if IMC is active or not, this method is
915                          * described on coreboot's AMD IMC notes
916                          */
917                         pci_bus_read_config_byte(dev->bus, PCI_DEVFN(0x14, 3),
918                                                  0x40, &imc);
919                         if (imc & 0x80)
920                                 notify_imc = true;
921                 }
922
923                 /* base address location etc changed in SB800 */
924                 retval = piix4_setup_sb800(dev, id, 0);
925                 if (retval < 0) {
926                         release_region(SB800_PIIX4_SMB_IDX, 2);
927                         return retval;
928                 }
929
930                 /*
931                  * Try to register multiplexed main SMBus adapter,
932                  * give up if we can't
933                  */
934                 retval = piix4_add_adapters_sb800(dev, retval, notify_imc);
935                 if (retval < 0) {
936                         release_region(SB800_PIIX4_SMB_IDX, 2);
937                         return retval;
938                 }
939         } else {
940                 retval = piix4_setup(dev, id);
941                 if (retval < 0)
942                         return retval;
943
944                 /* Try to register main SMBus adapter, give up if we can't */
945                 retval = piix4_add_adapter(dev, retval, false, 0, false, "",
946                                            &piix4_main_adapters[0]);
947                 if (retval < 0)
948                         return retval;
949         }
950
951         /* Check for auxiliary SMBus on some AMD chipsets */
952         retval = -ENODEV;
953
954         if (dev->vendor == PCI_VENDOR_ID_ATI &&
955             dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS) {
956                 if (dev->revision < 0x40) {
957                         retval = piix4_setup_aux(dev, id, 0x58);
958                 } else {
959                         /* SB800 added aux bus too */
960                         retval = piix4_setup_sb800(dev, id, 1);
961                 }
962         }
963
964         if (dev->vendor == PCI_VENDOR_ID_AMD &&
965             dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS) {
966                 retval = piix4_setup_sb800(dev, id, 1);
967         }
968
969         if (retval > 0) {
970                 /* Try to add the aux adapter if it exists,
971                  * piix4_add_adapter will clean up if this fails */
972                 piix4_add_adapter(dev, retval, false, 0, false,
973                                   is_sb800 ? piix4_aux_port_name_sb800 : "",
974                                   &piix4_aux_adapter);
975         }
976
977         return 0;
978 }
979
980 static void piix4_adap_remove(struct i2c_adapter *adap)
981 {
982         struct i2c_piix4_adapdata *adapdata = i2c_get_adapdata(adap);
983
984         if (adapdata->smba) {
985                 i2c_del_adapter(adap);
986                 if (adapdata->port == (0 << piix4_port_shift_sb800)) {
987                         release_region(adapdata->smba, SMBIOSIZE);
988                         if (adapdata->sb800_main)
989                                 release_region(SB800_PIIX4_SMB_IDX, 2);
990                 }
991                 kfree(adapdata);
992                 kfree(adap);
993         }
994 }
995
996 static void piix4_remove(struct pci_dev *dev)
997 {
998         int port = PIIX4_MAX_ADAPTERS;
999
1000         while (--port >= 0) {
1001                 if (piix4_main_adapters[port]) {
1002                         piix4_adap_remove(piix4_main_adapters[port]);
1003                         piix4_main_adapters[port] = NULL;
1004                 }
1005         }
1006
1007         if (piix4_aux_adapter) {
1008                 piix4_adap_remove(piix4_aux_adapter);
1009                 piix4_aux_adapter = NULL;
1010         }
1011 }
1012
1013 static struct pci_driver piix4_driver = {
1014         .name           = "piix4_smbus",
1015         .id_table       = piix4_ids,
1016         .probe          = piix4_probe,
1017         .remove         = piix4_remove,
1018 };
1019
1020 module_pci_driver(piix4_driver);
1021
1022 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
1023                 "Philip Edelbrock <phil@netroedge.com>");
1024 MODULE_DESCRIPTION("PIIX4 SMBus driver");
1025 MODULE_LICENSE("GPL");