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
28 Note: we assume there can only be one device, with one SMBus interface.
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/sched.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 /* match up the function */
125 if (PCI_FUNC(PIIX4_dev->devfn) != id->driver_data)
128 dev_info(&PIIX4_dev->dev, "Found %s device\n", pci_name(PIIX4_dev));
130 /* Don't access SMBus on IBM systems which get corrupted eeproms */
131 if (dmi_check_system(piix4_dmi_table) &&
132 PIIX4_dev->vendor == PCI_VENDOR_ID_INTEL) {
133 dev_err(&PIIX4_dev->dev, "IBM system detected; this module "
134 "may corrupt your serial eeprom! Refusing to load "
139 /* Determine the address of the SMBus areas */
141 piix4_smba = force_addr & 0xfff0;
144 pci_read_config_word(PIIX4_dev, SMBBA, &piix4_smba);
145 piix4_smba &= 0xfff0;
146 if(piix4_smba == 0) {
147 dev_err(&PIIX4_dev->dev, "SMB base address "
148 "uninitialized - upgrade BIOS or use "
149 "force_addr=0xaddr\n");
154 if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
155 dev_err(&PIIX4_dev->dev, "SMB region 0x%x already in use!\n",
160 pci_read_config_byte(PIIX4_dev, SMBHSTCFG, &temp);
162 /* If force_addr is set, we program the new address here. Just to make
163 sure, we disable the PIIX4 first. */
165 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp & 0xfe);
166 pci_write_config_word(PIIX4_dev, SMBBA, piix4_smba);
167 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp | 0x01);
168 dev_info(&PIIX4_dev->dev, "WARNING: SMBus interface set to "
169 "new address %04x!\n", piix4_smba);
170 } else if ((temp & 1) == 0) {
172 /* This should never need to be done, but has been
173 * noted that many Dell machines have the SMBus
174 * interface on the PIIX4 disabled!? NOTE: This assumes
175 * I/O space and other allocations WERE done by the
176 * Bios! Don't complain if your hardware does weird
177 * things after enabling this. :') Check for Bios
178 * updates before resorting to this.
180 pci_write_config_byte(PIIX4_dev, SMBHSTCFG,
182 dev_printk(KERN_NOTICE, &PIIX4_dev->dev,
183 "WARNING: SMBus interface has been "
184 "FORCEFULLY ENABLED!\n");
186 dev_err(&PIIX4_dev->dev,
187 "Host SMBus controller not enabled!\n");
188 release_region(piix4_smba, SMBIOSIZE);
194 if (((temp & 0x0E) == 8) || ((temp & 0x0E) == 2))
195 dev_dbg(&PIIX4_dev->dev, "Using Interrupt 9 for SMBus.\n");
196 else if ((temp & 0x0E) == 0)
197 dev_dbg(&PIIX4_dev->dev, "Using Interrupt SMI# for SMBus.\n");
199 dev_err(&PIIX4_dev->dev, "Illegal Interrupt configuration "
200 "(or code out of date)!\n");
202 pci_read_config_byte(PIIX4_dev, SMBREV, &temp);
203 dev_dbg(&PIIX4_dev->dev, "SMBREV = 0x%X\n", temp);
204 dev_dbg(&PIIX4_dev->dev, "SMBA = 0x%X\n", piix4_smba);
209 /* Another internally used function */
210 static int piix4_transaction(void)
216 dev_dbg(&piix4_adapter.dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
217 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
218 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
221 /* Make sure the SMBus host is ready to start transmitting */
222 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
223 dev_dbg(&piix4_adapter.dev, "SMBus busy (%02x). "
224 "Resetting...\n", temp);
225 outb_p(temp, SMBHSTSTS);
226 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
227 dev_err(&piix4_adapter.dev, "Failed! (%02x)\n", temp);
230 dev_dbg(&piix4_adapter.dev, "Successfull!\n");
234 /* start the transaction by setting bit 6 */
235 outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT);
237 /* We will always wait for a fraction of a second! (See PIIX4 docs errata) */
240 temp = inb_p(SMBHSTSTS);
241 } while ((temp & 0x01) && (timeout++ < MAX_TIMEOUT));
243 /* If the SMBus is still busy, we give up */
244 if (timeout >= MAX_TIMEOUT) {
245 dev_err(&piix4_adapter.dev, "SMBus Timeout!\n");
251 dev_err(&piix4_adapter.dev, "Error: Failed bus transaction\n");
256 dev_dbg(&piix4_adapter.dev, "Bus collision! SMBus may be "
257 "locked until next hard reset. (sorry!)\n");
258 /* Clock stops and slave is stuck in mid-transmission */
263 dev_dbg(&piix4_adapter.dev, "Error: no response!\n");
266 if (inb_p(SMBHSTSTS) != 0x00)
267 outb_p(inb(SMBHSTSTS), SMBHSTSTS);
269 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
270 dev_err(&piix4_adapter.dev, "Failed reset at end of "
271 "transaction (%02x)\n", temp);
273 dev_dbg(&piix4_adapter.dev, "Transaction (post): CNT=%02x, CMD=%02x, "
274 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
275 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
280 /* Return -1 on error. */
281 static s32 piix4_access(struct i2c_adapter * adap, u16 addr,
282 unsigned short flags, char read_write,
283 u8 command, int size, union i2c_smbus_data * data)
288 case I2C_SMBUS_PROC_CALL:
289 dev_err(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n");
291 case I2C_SMBUS_QUICK:
292 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
297 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
299 if (read_write == I2C_SMBUS_WRITE)
300 outb_p(command, SMBHSTCMD);
303 case I2C_SMBUS_BYTE_DATA:
304 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
306 outb_p(command, SMBHSTCMD);
307 if (read_write == I2C_SMBUS_WRITE)
308 outb_p(data->byte, SMBHSTDAT0);
309 size = PIIX4_BYTE_DATA;
311 case I2C_SMBUS_WORD_DATA:
312 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
314 outb_p(command, SMBHSTCMD);
315 if (read_write == I2C_SMBUS_WRITE) {
316 outb_p(data->word & 0xff, SMBHSTDAT0);
317 outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
319 size = PIIX4_WORD_DATA;
321 case I2C_SMBUS_BLOCK_DATA:
322 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
324 outb_p(command, SMBHSTCMD);
325 if (read_write == I2C_SMBUS_WRITE) {
326 len = data->block[0];
331 outb_p(len, SMBHSTDAT0);
332 i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
333 for (i = 1; i <= len; i++)
334 outb_p(data->block[i], SMBBLKDAT);
336 size = PIIX4_BLOCK_DATA;
340 outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);
342 if (piix4_transaction()) /* Error in transaction */
345 if ((read_write == I2C_SMBUS_WRITE) || (size == PIIX4_QUICK))
350 case PIIX4_BYTE: /* Where is the result put? I assume here it is in
351 SMBHSTDAT0 but it might just as well be in the
352 SMBHSTCMD. No clue in the docs */
354 data->byte = inb_p(SMBHSTDAT0);
356 case PIIX4_BYTE_DATA:
357 data->byte = inb_p(SMBHSTDAT0);
359 case PIIX4_WORD_DATA:
360 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
362 case PIIX4_BLOCK_DATA:
363 data->block[0] = inb_p(SMBHSTDAT0);
364 i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
365 for (i = 1; i <= data->block[0]; i++)
366 data->block[i] = inb_p(SMBBLKDAT);
372 static u32 piix4_func(struct i2c_adapter *adapter)
374 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
375 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
376 I2C_FUNC_SMBUS_BLOCK_DATA;
379 static struct i2c_algorithm smbus_algorithm = {
380 .smbus_xfer = piix4_access,
381 .functionality = piix4_func,
384 static struct i2c_adapter piix4_adapter = {
385 .owner = THIS_MODULE,
386 .class = I2C_CLASS_HWMON,
387 .algo = &smbus_algorithm,
390 static struct pci_device_id piix4_ids[] = {
391 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3),
393 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP200_SMBUS),
395 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP300_SMBUS),
397 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS),
399 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_OSB4),
401 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB5),
403 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_CSB6),
405 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS, PCI_DEVICE_ID_SERVERWORKS_HT1000SB),
407 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443MX_3),
409 { PCI_DEVICE(PCI_VENDOR_ID_EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_3),
414 MODULE_DEVICE_TABLE (pci, piix4_ids);
416 static int __devinit piix4_probe(struct pci_dev *dev,
417 const struct pci_device_id *id)
421 retval = piix4_setup(dev, id);
425 /* set up the driverfs linkage to our parent device */
426 piix4_adapter.dev.parent = &dev->dev;
428 snprintf(piix4_adapter.name, I2C_NAME_SIZE,
429 "SMBus PIIX4 adapter at %04x", piix4_smba);
431 if ((retval = i2c_add_adapter(&piix4_adapter))) {
432 dev_err(&dev->dev, "Couldn't register adapter!\n");
433 release_region(piix4_smba, SMBIOSIZE);
440 static void __devexit piix4_remove(struct pci_dev *dev)
443 i2c_del_adapter(&piix4_adapter);
444 release_region(piix4_smba, SMBIOSIZE);
449 static struct pci_driver piix4_driver = {
450 .name = "piix4_smbus",
451 .id_table = piix4_ids,
452 .probe = piix4_probe,
453 .remove = __devexit_p(piix4_remove),
456 static int __init i2c_piix4_init(void)
458 return pci_register_driver(&piix4_driver);
461 static void __exit i2c_piix4_exit(void)
463 pci_unregister_driver(&piix4_driver);
466 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
467 "Philip Edelbrock <phil@netroedge.com>");
468 MODULE_DESCRIPTION("PIIX4 SMBus driver");
469 MODULE_LICENSE("GPL");
471 module_init(i2c_piix4_init);
472 module_exit(i2c_piix4_exit);