2 Copyright (c) 1998 - 2002 Frodo Looijaard <frodol@dds.nl> and
3 Philip Edelbrock <phil@netroedge.com>
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.
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.
15 You should have received a copy of the GNU General Public License
16 along with this program; if not, write to the Free Software
17 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 Serverworks OSB4, CSB5, CSB6, HT-1000
24 ATI IXP200, IXP300, IXP400, SB600, SB700, SB800
27 Note: we assume there can only be one device, with one SMBus interface.
30 #include <linux/module.h>
31 #include <linux/moduleparam.h>
32 #include <linux/pci.h>
33 #include <linux/kernel.h>
34 #include <linux/delay.h>
35 #include <linux/stddef.h>
36 #include <linux/ioport.h>
37 #include <linux/i2c.h>
38 #include <linux/init.h>
39 #include <linux/dmi.h>
40 #include <linux/acpi.h>
44 /* PIIX4 SMBus address offsets */
45 #define SMBHSTSTS (0 + piix4_smba)
46 #define SMBHSLVSTS (1 + piix4_smba)
47 #define SMBHSTCNT (2 + piix4_smba)
48 #define SMBHSTCMD (3 + piix4_smba)
49 #define SMBHSTADD (4 + piix4_smba)
50 #define SMBHSTDAT0 (5 + piix4_smba)
51 #define SMBHSTDAT1 (6 + piix4_smba)
52 #define SMBBLKDAT (7 + piix4_smba)
53 #define SMBSLVCNT (8 + piix4_smba)
54 #define SMBSHDWCMD (9 + piix4_smba)
55 #define SMBSLVEVT (0xA + piix4_smba)
56 #define SMBSLVDAT (0xC + piix4_smba)
58 /* count for request_region */
61 /* PCI Address Constants */
63 #define SMBHSTCFG 0x0D2
65 #define SMBSHDW1 0x0D4
66 #define SMBSHDW2 0x0D5
70 #define MAX_TIMEOUT 500
74 #define PIIX4_QUICK 0x00
75 #define PIIX4_BYTE 0x04
76 #define PIIX4_BYTE_DATA 0x08
77 #define PIIX4_WORD_DATA 0x0C
78 #define PIIX4_BLOCK_DATA 0x14
80 /* insmod parameters */
82 /* If force is set to anything different from 0, we forcibly enable the
85 module_param (force, int, 0);
86 MODULE_PARM_DESC(force, "Forcibly enable the PIIX4. DANGEROUS!");
88 /* If force_addr is set to anything different from 0, we forcibly enable
89 the PIIX4 at the given address. VERY DANGEROUS! */
90 static int force_addr;
91 module_param (force_addr, int, 0);
92 MODULE_PARM_DESC(force_addr,
93 "Forcibly enable the PIIX4 at the given address. "
94 "EXTREMELY DANGEROUS!");
96 static unsigned short piix4_smba;
97 static int srvrworks_csb5_delay;
98 static struct pci_driver piix4_driver;
99 static struct i2c_adapter piix4_adapter;
101 static struct dmi_system_id __devinitdata piix4_dmi_blacklist[] = {
103 .ident = "Sapphire AM2RD790",
105 DMI_MATCH(DMI_BOARD_VENDOR, "SAPPHIRE Inc."),
106 DMI_MATCH(DMI_BOARD_NAME, "PC-AM2RD790"),
110 .ident = "DFI Lanparty UT 790FX",
112 DMI_MATCH(DMI_BOARD_VENDOR, "DFI Inc."),
113 DMI_MATCH(DMI_BOARD_NAME, "LP UT 790FX"),
119 /* The IBM entry is in a separate table because we only check it
120 on Intel-based systems */
121 static struct dmi_system_id __devinitdata piix4_dmi_ibm[] = {
124 .matches = { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
129 static int __devinit piix4_setup(struct pci_dev *PIIX4_dev,
130 const struct pci_device_id *id)
134 if ((PIIX4_dev->vendor == PCI_VENDOR_ID_SERVERWORKS) &&
135 (PIIX4_dev->device == PCI_DEVICE_ID_SERVERWORKS_CSB5))
136 srvrworks_csb5_delay = 1;
138 /* On some motherboards, it was reported that accessing the SMBus
139 caused severe hardware problems */
140 if (dmi_check_system(piix4_dmi_blacklist)) {
141 dev_err(&PIIX4_dev->dev,
142 "Accessing the SMBus on this system is unsafe!\n");
146 /* Don't access SMBus on IBM systems which get corrupted eeproms */
147 if (dmi_check_system(piix4_dmi_ibm) &&
148 PIIX4_dev->vendor == PCI_VENDOR_ID_INTEL) {
149 dev_err(&PIIX4_dev->dev, "IBM system detected; this module "
150 "may corrupt your serial eeprom! Refusing to load "
155 /* Determine the address of the SMBus areas */
157 piix4_smba = force_addr & 0xfff0;
160 pci_read_config_word(PIIX4_dev, SMBBA, &piix4_smba);
161 piix4_smba &= 0xfff0;
162 if(piix4_smba == 0) {
163 dev_err(&PIIX4_dev->dev, "SMBus base address "
164 "uninitialized - upgrade BIOS or use "
165 "force_addr=0xaddr\n");
170 if (acpi_check_region(piix4_smba, SMBIOSIZE, piix4_driver.name))
173 if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
174 dev_err(&PIIX4_dev->dev, "SMBus region 0x%x already in use!\n",
179 pci_read_config_byte(PIIX4_dev, SMBHSTCFG, &temp);
181 /* If force_addr is set, we program the new address here. Just to make
182 sure, we disable the PIIX4 first. */
184 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp & 0xfe);
185 pci_write_config_word(PIIX4_dev, SMBBA, piix4_smba);
186 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp | 0x01);
187 dev_info(&PIIX4_dev->dev, "WARNING: SMBus interface set to "
188 "new address %04x!\n", piix4_smba);
189 } else if ((temp & 1) == 0) {
191 /* This should never need to be done, but has been
192 * noted that many Dell machines have the SMBus
193 * interface on the PIIX4 disabled!? NOTE: This assumes
194 * I/O space and other allocations WERE done by the
195 * Bios! Don't complain if your hardware does weird
196 * things after enabling this. :') Check for Bios
197 * updates before resorting to this.
199 pci_write_config_byte(PIIX4_dev, SMBHSTCFG,
201 dev_printk(KERN_NOTICE, &PIIX4_dev->dev,
202 "WARNING: SMBus interface has been "
203 "FORCEFULLY ENABLED!\n");
205 dev_err(&PIIX4_dev->dev,
206 "Host SMBus controller not enabled!\n");
207 release_region(piix4_smba, SMBIOSIZE);
213 if (((temp & 0x0E) == 8) || ((temp & 0x0E) == 2))
214 dev_dbg(&PIIX4_dev->dev, "Using Interrupt 9 for SMBus.\n");
215 else if ((temp & 0x0E) == 0)
216 dev_dbg(&PIIX4_dev->dev, "Using Interrupt SMI# for SMBus.\n");
218 dev_err(&PIIX4_dev->dev, "Illegal Interrupt configuration "
219 "(or code out of date)!\n");
221 pci_read_config_byte(PIIX4_dev, SMBREV, &temp);
222 dev_info(&PIIX4_dev->dev,
223 "SMBus Host Controller at 0x%x, revision %d\n",
229 static int piix4_transaction(void)
235 dev_dbg(&piix4_adapter.dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
236 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
237 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
240 /* Make sure the SMBus host is ready to start transmitting */
241 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
242 dev_dbg(&piix4_adapter.dev, "SMBus busy (%02x). "
243 "Resetting...\n", temp);
244 outb_p(temp, SMBHSTSTS);
245 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
246 dev_err(&piix4_adapter.dev, "Failed! (%02x)\n", temp);
249 dev_dbg(&piix4_adapter.dev, "Successful!\n");
253 /* start the transaction by setting bit 6 */
254 outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT);
256 /* We will always wait for a fraction of a second! (See PIIX4 docs errata) */
257 if (srvrworks_csb5_delay) /* Extra delay for SERVERWORKS_CSB5 */
262 while ((timeout++ < MAX_TIMEOUT) &&
263 ((temp = inb_p(SMBHSTSTS)) & 0x01))
266 /* If the SMBus is still busy, we give up */
267 if (timeout >= MAX_TIMEOUT) {
268 dev_err(&piix4_adapter.dev, "SMBus Timeout!\n");
274 dev_err(&piix4_adapter.dev, "Error: Failed bus transaction\n");
279 dev_dbg(&piix4_adapter.dev, "Bus collision! SMBus may be "
280 "locked until next hard reset. (sorry!)\n");
281 /* Clock stops and slave is stuck in mid-transmission */
286 dev_dbg(&piix4_adapter.dev, "Error: no response!\n");
289 if (inb_p(SMBHSTSTS) != 0x00)
290 outb_p(inb(SMBHSTSTS), SMBHSTSTS);
292 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
293 dev_err(&piix4_adapter.dev, "Failed reset at end of "
294 "transaction (%02x)\n", temp);
296 dev_dbg(&piix4_adapter.dev, "Transaction (post): CNT=%02x, CMD=%02x, "
297 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
298 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
303 /* Return negative errno on error. */
304 static s32 piix4_access(struct i2c_adapter * adap, u16 addr,
305 unsigned short flags, char read_write,
306 u8 command, int size, union i2c_smbus_data * data)
312 case I2C_SMBUS_QUICK:
313 outb_p((addr << 1) | read_write,
318 outb_p((addr << 1) | read_write,
320 if (read_write == I2C_SMBUS_WRITE)
321 outb_p(command, SMBHSTCMD);
324 case I2C_SMBUS_BYTE_DATA:
325 outb_p((addr << 1) | read_write,
327 outb_p(command, SMBHSTCMD);
328 if (read_write == I2C_SMBUS_WRITE)
329 outb_p(data->byte, SMBHSTDAT0);
330 size = PIIX4_BYTE_DATA;
332 case I2C_SMBUS_WORD_DATA:
333 outb_p((addr << 1) | read_write,
335 outb_p(command, SMBHSTCMD);
336 if (read_write == I2C_SMBUS_WRITE) {
337 outb_p(data->word & 0xff, SMBHSTDAT0);
338 outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
340 size = PIIX4_WORD_DATA;
342 case I2C_SMBUS_BLOCK_DATA:
343 outb_p((addr << 1) | read_write,
345 outb_p(command, SMBHSTCMD);
346 if (read_write == I2C_SMBUS_WRITE) {
347 len = data->block[0];
348 if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
350 outb_p(len, SMBHSTDAT0);
351 i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
352 for (i = 1; i <= len; i++)
353 outb_p(data->block[i], SMBBLKDAT);
355 size = PIIX4_BLOCK_DATA;
358 dev_warn(&adap->dev, "Unsupported transaction %d\n", size);
362 outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);
364 status = piix4_transaction();
368 if ((read_write == I2C_SMBUS_WRITE) || (size == PIIX4_QUICK))
374 case PIIX4_BYTE_DATA:
375 data->byte = inb_p(SMBHSTDAT0);
377 case PIIX4_WORD_DATA:
378 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
380 case PIIX4_BLOCK_DATA:
381 data->block[0] = inb_p(SMBHSTDAT0);
382 if (data->block[0] == 0 || data->block[0] > I2C_SMBUS_BLOCK_MAX)
384 i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
385 for (i = 1; i <= data->block[0]; i++)
386 data->block[i] = inb_p(SMBBLKDAT);
392 static u32 piix4_func(struct i2c_adapter *adapter)
394 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
395 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
396 I2C_FUNC_SMBUS_BLOCK_DATA;
399 static const struct i2c_algorithm smbus_algorithm = {
400 .smbus_xfer = piix4_access,
401 .functionality = piix4_func,
404 static struct i2c_adapter piix4_adapter = {
405 .owner = THIS_MODULE,
406 .id = I2C_HW_SMBUS_PIIX4,
407 .class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
408 .algo = &smbus_algorithm,
411 static struct pci_device_id piix4_ids[] = {
412 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3) },
413 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443MX_3) },
414 { PCI_DEVICE(PCI_VENDOR_ID_EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_3) },
415 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP200_SMBUS) },
416 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP300_SMBUS) },
417 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS) },
418 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS) },
419 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
420 PCI_DEVICE_ID_SERVERWORKS_OSB4) },
421 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
422 PCI_DEVICE_ID_SERVERWORKS_CSB5) },
423 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
424 PCI_DEVICE_ID_SERVERWORKS_CSB6) },
425 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
426 PCI_DEVICE_ID_SERVERWORKS_HT1000SB) },
430 MODULE_DEVICE_TABLE (pci, piix4_ids);
432 static int __devinit piix4_probe(struct pci_dev *dev,
433 const struct pci_device_id *id)
437 retval = piix4_setup(dev, id);
441 /* set up the sysfs linkage to our parent device */
442 piix4_adapter.dev.parent = &dev->dev;
444 snprintf(piix4_adapter.name, sizeof(piix4_adapter.name),
445 "SMBus PIIX4 adapter at %04x", piix4_smba);
447 if ((retval = i2c_add_adapter(&piix4_adapter))) {
448 dev_err(&dev->dev, "Couldn't register adapter!\n");
449 release_region(piix4_smba, SMBIOSIZE);
456 static void __devexit piix4_remove(struct pci_dev *dev)
459 i2c_del_adapter(&piix4_adapter);
460 release_region(piix4_smba, SMBIOSIZE);
465 static struct pci_driver piix4_driver = {
466 .name = "piix4_smbus",
467 .id_table = piix4_ids,
468 .probe = piix4_probe,
469 .remove = __devexit_p(piix4_remove),
472 static int __init i2c_piix4_init(void)
474 return pci_register_driver(&piix4_driver);
477 static void __exit i2c_piix4_exit(void)
479 pci_unregister_driver(&piix4_driver);
482 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
483 "Philip Edelbrock <phil@netroedge.com>");
484 MODULE_DESCRIPTION("PIIX4 SMBus driver");
485 MODULE_LICENSE("GPL");
487 module_init(i2c_piix4_init);
488 module_exit(i2c_piix4_exit);