2 piix4.c - Part of lm_sensors, Linux kernel modules for hardware
4 Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl> and
5 Philip Edelbrock <phil@netroedge.com>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 Serverworks OSB4, CSB5, CSB6, HT-1000
26 ATI IXP200, IXP300, IXP400, SB600, SB700, SB800
29 Note: we assume there can only be one device, with one SMBus interface.
32 #include <linux/module.h>
33 #include <linux/moduleparam.h>
34 #include <linux/pci.h>
35 #include <linux/kernel.h>
36 #include <linux/delay.h>
37 #include <linux/stddef.h>
38 #include <linux/ioport.h>
39 #include <linux/i2c.h>
40 #include <linux/init.h>
41 #include <linux/dmi.h>
46 const unsigned short mfr;
47 const unsigned short dev;
48 const unsigned char fn;
52 /* PIIX4 SMBus address offsets */
53 #define SMBHSTSTS (0 + piix4_smba)
54 #define SMBHSLVSTS (1 + piix4_smba)
55 #define SMBHSTCNT (2 + piix4_smba)
56 #define SMBHSTCMD (3 + piix4_smba)
57 #define SMBHSTADD (4 + piix4_smba)
58 #define SMBHSTDAT0 (5 + piix4_smba)
59 #define SMBHSTDAT1 (6 + piix4_smba)
60 #define SMBBLKDAT (7 + piix4_smba)
61 #define SMBSLVCNT (8 + piix4_smba)
62 #define SMBSHDWCMD (9 + piix4_smba)
63 #define SMBSLVEVT (0xA + piix4_smba)
64 #define SMBSLVDAT (0xC + piix4_smba)
66 /* count for request_region */
69 /* PCI Address Constants */
71 #define SMBHSTCFG 0x0D2
73 #define SMBSHDW1 0x0D4
74 #define SMBSHDW2 0x0D5
78 #define MAX_TIMEOUT 500
82 #define PIIX4_QUICK 0x00
83 #define PIIX4_BYTE 0x04
84 #define PIIX4_BYTE_DATA 0x08
85 #define PIIX4_WORD_DATA 0x0C
86 #define PIIX4_BLOCK_DATA 0x14
88 /* insmod parameters */
90 /* If force is set to anything different from 0, we forcibly enable the
93 module_param (force, int, 0);
94 MODULE_PARM_DESC(force, "Forcibly enable the PIIX4. DANGEROUS!");
96 /* If force_addr is set to anything different from 0, we forcibly enable
97 the PIIX4 at the given address. VERY DANGEROUS! */
98 static int force_addr;
99 module_param (force_addr, int, 0);
100 MODULE_PARM_DESC(force_addr,
101 "Forcibly enable the PIIX4 at the given address. "
102 "EXTREMELY DANGEROUS!");
104 static int piix4_transaction(void);
106 static unsigned short piix4_smba;
107 static int srvrworks_csb5_delay;
108 static struct pci_driver piix4_driver;
109 static struct i2c_adapter piix4_adapter;
111 static struct dmi_system_id __devinitdata piix4_dmi_blacklist[] = {
113 .ident = "Sapphire AM2RD790",
115 DMI_MATCH(DMI_BOARD_VENDOR, "SAPPHIRE Inc."),
116 DMI_MATCH(DMI_BOARD_NAME, "PC-AM2RD790"),
120 .ident = "DFI Lanparty UT 790FX",
122 DMI_MATCH(DMI_BOARD_VENDOR, "DFI Inc."),
123 DMI_MATCH(DMI_BOARD_NAME, "LP UT 790FX"),
129 /* The IBM entry is in a separate table because we only check it
130 on Intel-based systems */
131 static struct dmi_system_id __devinitdata piix4_dmi_ibm[] = {
134 .matches = { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
139 static int __devinit piix4_setup(struct pci_dev *PIIX4_dev,
140 const struct pci_device_id *id)
144 dev_info(&PIIX4_dev->dev, "Found %s device\n", pci_name(PIIX4_dev));
146 if ((PIIX4_dev->vendor == PCI_VENDOR_ID_SERVERWORKS) &&
147 (PIIX4_dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5))
148 srvrworks_csb5_delay = 1;
150 /* On some motherboards, it was reported that accessing the SMBus
151 caused severe hardware problems */
152 if (dmi_check_system(piix4_dmi_blacklist)) {
153 dev_err(&PIIX4_dev->dev,
154 "Accessing the SMBus on this system is unsafe!\n");
158 /* Don't access SMBus on IBM systems which get corrupted eeproms */
159 if (dmi_check_system(piix4_dmi_ibm) &&
160 PIIX4_dev->vendor == PCI_VENDOR_ID_INTEL) {
161 dev_err(&PIIX4_dev->dev, "IBM system detected; this module "
162 "may corrupt your serial eeprom! Refusing to load "
167 /* Determine the address of the SMBus areas */
169 piix4_smba = force_addr & 0xfff0;
172 pci_read_config_word(PIIX4_dev, SMBBA, &piix4_smba);
173 piix4_smba &= 0xfff0;
174 if(piix4_smba == 0) {
175 dev_err(&PIIX4_dev->dev, "SMB base address "
176 "uninitialized - upgrade BIOS or use "
177 "force_addr=0xaddr\n");
182 if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
183 dev_err(&PIIX4_dev->dev, "SMB region 0x%x already in use!\n",
188 pci_read_config_byte(PIIX4_dev, SMBHSTCFG, &temp);
190 /* If force_addr is set, we program the new address here. Just to make
191 sure, we disable the PIIX4 first. */
193 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp & 0xfe);
194 pci_write_config_word(PIIX4_dev, SMBBA, piix4_smba);
195 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp | 0x01);
196 dev_info(&PIIX4_dev->dev, "WARNING: SMBus interface set to "
197 "new address %04x!\n", piix4_smba);
198 } else if ((temp & 1) == 0) {
200 /* This should never need to be done, but has been
201 * noted that many Dell machines have the SMBus
202 * interface on the PIIX4 disabled!? NOTE: This assumes
203 * I/O space and other allocations WERE done by the
204 * Bios! Don't complain if your hardware does weird
205 * things after enabling this. :') Check for Bios
206 * updates before resorting to this.
208 pci_write_config_byte(PIIX4_dev, SMBHSTCFG,
210 dev_printk(KERN_NOTICE, &PIIX4_dev->dev,
211 "WARNING: SMBus interface has been "
212 "FORCEFULLY ENABLED!\n");
214 dev_err(&PIIX4_dev->dev,
215 "Host SMBus controller not enabled!\n");
216 release_region(piix4_smba, SMBIOSIZE);
222 if (((temp & 0x0E) == 8) || ((temp & 0x0E) == 2))
223 dev_dbg(&PIIX4_dev->dev, "Using Interrupt 9 for SMBus.\n");
224 else if ((temp & 0x0E) == 0)
225 dev_dbg(&PIIX4_dev->dev, "Using Interrupt SMI# for SMBus.\n");
227 dev_err(&PIIX4_dev->dev, "Illegal Interrupt configuration "
228 "(or code out of date)!\n");
230 pci_read_config_byte(PIIX4_dev, SMBREV, &temp);
231 dev_dbg(&PIIX4_dev->dev, "SMBREV = 0x%X\n", temp);
232 dev_dbg(&PIIX4_dev->dev, "SMBA = 0x%X\n", piix4_smba);
237 /* Another internally used function */
238 static int piix4_transaction(void)
244 dev_dbg(&piix4_adapter.dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
245 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
246 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
249 /* Make sure the SMBus host is ready to start transmitting */
250 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
251 dev_dbg(&piix4_adapter.dev, "SMBus busy (%02x). "
252 "Resetting...\n", temp);
253 outb_p(temp, SMBHSTSTS);
254 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
255 dev_err(&piix4_adapter.dev, "Failed! (%02x)\n", temp);
258 dev_dbg(&piix4_adapter.dev, "Successful!\n");
262 /* start the transaction by setting bit 6 */
263 outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT);
265 /* We will always wait for a fraction of a second! (See PIIX4 docs errata) */
266 if (srvrworks_csb5_delay) /* Extra delay for SERVERWORKS_CSB5 */
271 while ((timeout++ < MAX_TIMEOUT) &&
272 ((temp = inb_p(SMBHSTSTS)) & 0x01))
275 /* If the SMBus is still busy, we give up */
276 if (timeout >= MAX_TIMEOUT) {
277 dev_err(&piix4_adapter.dev, "SMBus Timeout!\n");
283 dev_err(&piix4_adapter.dev, "Error: Failed bus transaction\n");
288 dev_dbg(&piix4_adapter.dev, "Bus collision! SMBus may be "
289 "locked until next hard reset. (sorry!)\n");
290 /* Clock stops and slave is stuck in mid-transmission */
295 dev_dbg(&piix4_adapter.dev, "Error: no response!\n");
298 if (inb_p(SMBHSTSTS) != 0x00)
299 outb_p(inb(SMBHSTSTS), SMBHSTSTS);
301 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
302 dev_err(&piix4_adapter.dev, "Failed reset at end of "
303 "transaction (%02x)\n", temp);
305 dev_dbg(&piix4_adapter.dev, "Transaction (post): CNT=%02x, CMD=%02x, "
306 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
307 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
312 /* Return -1 on error. */
313 static s32 piix4_access(struct i2c_adapter * adap, u16 addr,
314 unsigned short flags, char read_write,
315 u8 command, int size, union i2c_smbus_data * data)
320 case I2C_SMBUS_PROC_CALL:
321 dev_err(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n");
323 case I2C_SMBUS_QUICK:
324 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
329 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
331 if (read_write == I2C_SMBUS_WRITE)
332 outb_p(command, SMBHSTCMD);
335 case I2C_SMBUS_BYTE_DATA:
336 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
338 outb_p(command, SMBHSTCMD);
339 if (read_write == I2C_SMBUS_WRITE)
340 outb_p(data->byte, SMBHSTDAT0);
341 size = PIIX4_BYTE_DATA;
343 case I2C_SMBUS_WORD_DATA:
344 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
346 outb_p(command, SMBHSTCMD);
347 if (read_write == I2C_SMBUS_WRITE) {
348 outb_p(data->word & 0xff, SMBHSTDAT0);
349 outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
351 size = PIIX4_WORD_DATA;
353 case I2C_SMBUS_BLOCK_DATA:
354 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
356 outb_p(command, SMBHSTCMD);
357 if (read_write == I2C_SMBUS_WRITE) {
358 len = data->block[0];
363 outb_p(len, SMBHSTDAT0);
364 i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
365 for (i = 1; i <= len; i++)
366 outb_p(data->block[i], SMBBLKDAT);
368 size = PIIX4_BLOCK_DATA;
372 outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);
374 if (piix4_transaction()) /* Error in transaction */
377 if ((read_write == I2C_SMBUS_WRITE) || (size == PIIX4_QUICK))
383 case PIIX4_BYTE_DATA:
384 data->byte = inb_p(SMBHSTDAT0);
386 case PIIX4_WORD_DATA:
387 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
389 case PIIX4_BLOCK_DATA:
390 data->block[0] = inb_p(SMBHSTDAT0);
391 i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
392 for (i = 1; i <= data->block[0]; i++)
393 data->block[i] = inb_p(SMBBLKDAT);
399 static u32 piix4_func(struct i2c_adapter *adapter)
401 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
402 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
403 I2C_FUNC_SMBUS_BLOCK_DATA;
406 static const struct i2c_algorithm smbus_algorithm = {
407 .smbus_xfer = piix4_access,
408 .functionality = piix4_func,
411 static struct i2c_adapter piix4_adapter = {
412 .owner = THIS_MODULE,
413 .id = I2C_HW_SMBUS_PIIX4,
414 .class = I2C_CLASS_HWMON,
415 .algo = &smbus_algorithm,
418 static struct pci_device_id piix4_ids[] = {
419 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3) },
420 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443MX_3) },
421 { PCI_DEVICE(PCI_VENDOR_ID_EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_3) },
422 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP200_SMBUS) },
423 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP300_SMBUS) },
424 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS) },
425 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS) },
426 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
427 PCI_DEVICE_ID_SERVERWORKS_OSB4) },
428 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
429 PCI_DEVICE_ID_SERVERWORKS_CSB5) },
430 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
431 PCI_DEVICE_ID_SERVERWORKS_CSB6) },
432 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
433 PCI_DEVICE_ID_SERVERWORKS_HT1000SB) },
437 MODULE_DEVICE_TABLE (pci, piix4_ids);
439 static int __devinit piix4_probe(struct pci_dev *dev,
440 const struct pci_device_id *id)
444 retval = piix4_setup(dev, id);
448 /* set up the sysfs linkage to our parent device */
449 piix4_adapter.dev.parent = &dev->dev;
451 snprintf(piix4_adapter.name, sizeof(piix4_adapter.name),
452 "SMBus PIIX4 adapter at %04x", piix4_smba);
454 if ((retval = i2c_add_adapter(&piix4_adapter))) {
455 dev_err(&dev->dev, "Couldn't register adapter!\n");
456 release_region(piix4_smba, SMBIOSIZE);
463 static void __devexit piix4_remove(struct pci_dev *dev)
466 i2c_del_adapter(&piix4_adapter);
467 release_region(piix4_smba, SMBIOSIZE);
472 static struct pci_driver piix4_driver = {
473 .name = "piix4_smbus",
474 .id_table = piix4_ids,
475 .probe = piix4_probe,
476 .remove = __devexit_p(piix4_remove),
479 static int __init i2c_piix4_init(void)
481 return pci_register_driver(&piix4_driver);
484 static void __exit i2c_piix4_exit(void)
486 pci_unregister_driver(&piix4_driver);
489 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
490 "Philip Edelbrock <phil@netroedge.com>");
491 MODULE_DESCRIPTION("PIIX4 SMBus driver");
492 MODULE_LICENSE("GPL");
494 module_init(i2c_piix4_init);
495 module_exit(i2c_piix4_exit);