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/apm_bios.h>
42 #include <linux/dmi.h>
47 const unsigned short mfr;
48 const unsigned short dev;
49 const unsigned char fn;
53 /* PIIX4 SMBus address offsets */
54 #define SMBHSTSTS (0 + piix4_smba)
55 #define SMBHSLVSTS (1 + piix4_smba)
56 #define SMBHSTCNT (2 + piix4_smba)
57 #define SMBHSTCMD (3 + piix4_smba)
58 #define SMBHSTADD (4 + piix4_smba)
59 #define SMBHSTDAT0 (5 + piix4_smba)
60 #define SMBHSTDAT1 (6 + piix4_smba)
61 #define SMBBLKDAT (7 + piix4_smba)
62 #define SMBSLVCNT (8 + piix4_smba)
63 #define SMBSHDWCMD (9 + piix4_smba)
64 #define SMBSLVEVT (0xA + piix4_smba)
65 #define SMBSLVDAT (0xC + piix4_smba)
67 /* count for request_region */
70 /* PCI Address Constants */
72 #define SMBHSTCFG 0x0D2
74 #define SMBSHDW1 0x0D4
75 #define SMBSHDW2 0x0D5
79 #define MAX_TIMEOUT 500
83 #define PIIX4_QUICK 0x00
84 #define PIIX4_BYTE 0x04
85 #define PIIX4_BYTE_DATA 0x08
86 #define PIIX4_WORD_DATA 0x0C
87 #define PIIX4_BLOCK_DATA 0x14
89 /* insmod parameters */
91 /* If force is set to anything different from 0, we forcibly enable the
94 module_param (force, int, 0);
95 MODULE_PARM_DESC(force, "Forcibly enable the PIIX4. DANGEROUS!");
97 /* If force_addr is set to anything different from 0, we forcibly enable
98 the PIIX4 at the given address. VERY DANGEROUS! */
99 static int force_addr;
100 module_param (force_addr, int, 0);
101 MODULE_PARM_DESC(force_addr,
102 "Forcibly enable the PIIX4 at the given address. "
103 "EXTREMELY DANGEROUS!");
105 static int piix4_transaction(void);
107 static unsigned short piix4_smba;
108 static struct pci_driver piix4_driver;
109 static struct i2c_adapter piix4_adapter;
111 static struct dmi_system_id __devinitdata piix4_dmi_table[] = {
114 .matches = { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
119 static int __devinit piix4_setup(struct pci_dev *PIIX4_dev,
120 const struct pci_device_id *id)
124 dev_info(&PIIX4_dev->dev, "Found %s device\n", pci_name(PIIX4_dev));
126 /* Don't access SMBus on IBM systems which get corrupted eeproms */
127 if (dmi_check_system(piix4_dmi_table) &&
128 PIIX4_dev->vendor == PCI_VENDOR_ID_INTEL) {
129 dev_err(&PIIX4_dev->dev, "IBM system detected; this module "
130 "may corrupt your serial eeprom! Refusing to load "
135 /* Determine the address of the SMBus areas */
137 piix4_smba = force_addr & 0xfff0;
140 pci_read_config_word(PIIX4_dev, SMBBA, &piix4_smba);
141 piix4_smba &= 0xfff0;
142 if(piix4_smba == 0) {
143 dev_err(&PIIX4_dev->dev, "SMB base address "
144 "uninitialized - upgrade BIOS or use "
145 "force_addr=0xaddr\n");
150 if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
151 dev_err(&PIIX4_dev->dev, "SMB region 0x%x already in use!\n",
156 pci_read_config_byte(PIIX4_dev, SMBHSTCFG, &temp);
158 /* If force_addr is set, we program the new address here. Just to make
159 sure, we disable the PIIX4 first. */
161 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp & 0xfe);
162 pci_write_config_word(PIIX4_dev, SMBBA, piix4_smba);
163 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp | 0x01);
164 dev_info(&PIIX4_dev->dev, "WARNING: SMBus interface set to "
165 "new address %04x!\n", piix4_smba);
166 } else if ((temp & 1) == 0) {
168 /* This should never need to be done, but has been
169 * noted that many Dell machines have the SMBus
170 * interface on the PIIX4 disabled!? NOTE: This assumes
171 * I/O space and other allocations WERE done by the
172 * Bios! Don't complain if your hardware does weird
173 * things after enabling this. :') Check for Bios
174 * updates before resorting to this.
176 pci_write_config_byte(PIIX4_dev, SMBHSTCFG,
178 dev_printk(KERN_NOTICE, &PIIX4_dev->dev,
179 "WARNING: SMBus interface has been "
180 "FORCEFULLY ENABLED!\n");
182 dev_err(&PIIX4_dev->dev,
183 "Host SMBus controller not enabled!\n");
184 release_region(piix4_smba, SMBIOSIZE);
190 if (((temp & 0x0E) == 8) || ((temp & 0x0E) == 2))
191 dev_dbg(&PIIX4_dev->dev, "Using Interrupt 9 for SMBus.\n");
192 else if ((temp & 0x0E) == 0)
193 dev_dbg(&PIIX4_dev->dev, "Using Interrupt SMI# for SMBus.\n");
195 dev_err(&PIIX4_dev->dev, "Illegal Interrupt configuration "
196 "(or code out of date)!\n");
198 pci_read_config_byte(PIIX4_dev, SMBREV, &temp);
199 dev_dbg(&PIIX4_dev->dev, "SMBREV = 0x%X\n", temp);
200 dev_dbg(&PIIX4_dev->dev, "SMBA = 0x%X\n", piix4_smba);
205 /* Another internally used function */
206 static int piix4_transaction(void)
212 dev_dbg(&piix4_adapter.dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
213 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
214 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
217 /* Make sure the SMBus host is ready to start transmitting */
218 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
219 dev_dbg(&piix4_adapter.dev, "SMBus busy (%02x). "
220 "Resetting...\n", temp);
221 outb_p(temp, SMBHSTSTS);
222 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
223 dev_err(&piix4_adapter.dev, "Failed! (%02x)\n", temp);
226 dev_dbg(&piix4_adapter.dev, "Successfull!\n");
230 /* start the transaction by setting bit 6 */
231 outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT);
233 /* We will always wait for a fraction of a second! (See PIIX4 docs errata) */
236 temp = inb_p(SMBHSTSTS);
237 } while ((temp & 0x01) && (timeout++ < MAX_TIMEOUT));
239 /* If the SMBus is still busy, we give up */
240 if (timeout >= MAX_TIMEOUT) {
241 dev_err(&piix4_adapter.dev, "SMBus Timeout!\n");
247 dev_err(&piix4_adapter.dev, "Error: Failed bus transaction\n");
252 dev_dbg(&piix4_adapter.dev, "Bus collision! SMBus may be "
253 "locked until next hard reset. (sorry!)\n");
254 /* Clock stops and slave is stuck in mid-transmission */
259 dev_dbg(&piix4_adapter.dev, "Error: no response!\n");
262 if (inb_p(SMBHSTSTS) != 0x00)
263 outb_p(inb(SMBHSTSTS), SMBHSTSTS);
265 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
266 dev_err(&piix4_adapter.dev, "Failed reset at end of "
267 "transaction (%02x)\n", temp);
269 dev_dbg(&piix4_adapter.dev, "Transaction (post): CNT=%02x, CMD=%02x, "
270 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
271 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
276 /* Return -1 on error. */
277 static s32 piix4_access(struct i2c_adapter * adap, u16 addr,
278 unsigned short flags, char read_write,
279 u8 command, int size, union i2c_smbus_data * data)
284 case I2C_SMBUS_PROC_CALL:
285 dev_err(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n");
287 case I2C_SMBUS_QUICK:
288 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
293 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
295 if (read_write == I2C_SMBUS_WRITE)
296 outb_p(command, SMBHSTCMD);
299 case I2C_SMBUS_BYTE_DATA:
300 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
302 outb_p(command, SMBHSTCMD);
303 if (read_write == I2C_SMBUS_WRITE)
304 outb_p(data->byte, SMBHSTDAT0);
305 size = PIIX4_BYTE_DATA;
307 case I2C_SMBUS_WORD_DATA:
308 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
310 outb_p(command, SMBHSTCMD);
311 if (read_write == I2C_SMBUS_WRITE) {
312 outb_p(data->word & 0xff, SMBHSTDAT0);
313 outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
315 size = PIIX4_WORD_DATA;
317 case I2C_SMBUS_BLOCK_DATA:
318 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
320 outb_p(command, SMBHSTCMD);
321 if (read_write == I2C_SMBUS_WRITE) {
322 len = data->block[0];
327 outb_p(len, SMBHSTDAT0);
328 i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
329 for (i = 1; i <= len; i++)
330 outb_p(data->block[i], SMBBLKDAT);
332 size = PIIX4_BLOCK_DATA;
336 outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);
338 if (piix4_transaction()) /* Error in transaction */
341 if ((read_write == I2C_SMBUS_WRITE) || (size == PIIX4_QUICK))
346 case PIIX4_BYTE: /* Where is the result put? I assume here it is in
347 SMBHSTDAT0 but it might just as well be in the
348 SMBHSTCMD. No clue in the docs */
350 data->byte = inb_p(SMBHSTDAT0);
352 case PIIX4_BYTE_DATA:
353 data->byte = inb_p(SMBHSTDAT0);
355 case PIIX4_WORD_DATA:
356 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
358 case PIIX4_BLOCK_DATA:
359 data->block[0] = inb_p(SMBHSTDAT0);
360 i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
361 for (i = 1; i <= data->block[0]; i++)
362 data->block[i] = inb_p(SMBBLKDAT);
368 static u32 piix4_func(struct i2c_adapter *adapter)
370 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
371 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
372 I2C_FUNC_SMBUS_BLOCK_DATA;
375 static const struct i2c_algorithm smbus_algorithm = {
376 .smbus_xfer = piix4_access,
377 .functionality = piix4_func,
380 static struct i2c_adapter piix4_adapter = {
381 .owner = THIS_MODULE,
382 .id = I2C_HW_SMBUS_PIIX4,
383 .class = I2C_CLASS_HWMON,
384 .algo = &smbus_algorithm,
387 static struct pci_device_id piix4_ids[] = {
388 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3) },
389 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443MX_3) },
390 { PCI_DEVICE(PCI_VENDOR_ID_EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_3) },
391 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP200_SMBUS) },
392 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP300_SMBUS) },
393 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS) },
394 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS) },
395 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
396 PCI_DEVICE_ID_SERVERWORKS_OSB4) },
397 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
398 PCI_DEVICE_ID_SERVERWORKS_CSB5) },
399 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
400 PCI_DEVICE_ID_SERVERWORKS_CSB6) },
401 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
402 PCI_DEVICE_ID_SERVERWORKS_HT1000SB) },
406 MODULE_DEVICE_TABLE (pci, piix4_ids);
408 static int __devinit piix4_probe(struct pci_dev *dev,
409 const struct pci_device_id *id)
413 retval = piix4_setup(dev, id);
417 /* set up the sysfs linkage to our parent device */
418 piix4_adapter.dev.parent = &dev->dev;
420 snprintf(piix4_adapter.name, sizeof(piix4_adapter.name),
421 "SMBus PIIX4 adapter at %04x", piix4_smba);
423 if ((retval = i2c_add_adapter(&piix4_adapter))) {
424 dev_err(&dev->dev, "Couldn't register adapter!\n");
425 release_region(piix4_smba, SMBIOSIZE);
432 static void __devexit piix4_remove(struct pci_dev *dev)
435 i2c_del_adapter(&piix4_adapter);
436 release_region(piix4_smba, SMBIOSIZE);
441 static struct pci_driver piix4_driver = {
442 .name = "piix4_smbus",
443 .id_table = piix4_ids,
444 .probe = piix4_probe,
445 .remove = __devexit_p(piix4_remove),
448 static int __init i2c_piix4_init(void)
450 return pci_register_driver(&piix4_driver);
453 static void __exit i2c_piix4_exit(void)
455 pci_unregister_driver(&piix4_driver);
458 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
459 "Philip Edelbrock <phil@netroedge.com>");
460 MODULE_DESCRIPTION("PIIX4 SMBus driver");
461 MODULE_LICENSE("GPL");
463 module_init(i2c_piix4_init);
464 module_exit(i2c_piix4_exit);