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 struct pci_driver piix4_driver;
108 static struct i2c_adapter piix4_adapter;
110 static struct dmi_system_id __devinitdata piix4_dmi_table[] = {
113 .matches = { DMI_MATCH(DMI_SYS_VENDOR, "IBM"), },
118 static int __devinit piix4_setup(struct pci_dev *PIIX4_dev,
119 const struct pci_device_id *id)
123 dev_info(&PIIX4_dev->dev, "Found %s device\n", pci_name(PIIX4_dev));
125 /* Don't access SMBus on IBM systems which get corrupted eeproms */
126 if (dmi_check_system(piix4_dmi_table) &&
127 PIIX4_dev->vendor == PCI_VENDOR_ID_INTEL) {
128 dev_err(&PIIX4_dev->dev, "IBM system detected; this module "
129 "may corrupt your serial eeprom! Refusing to load "
134 /* Determine the address of the SMBus areas */
136 piix4_smba = force_addr & 0xfff0;
139 pci_read_config_word(PIIX4_dev, SMBBA, &piix4_smba);
140 piix4_smba &= 0xfff0;
141 if(piix4_smba == 0) {
142 dev_err(&PIIX4_dev->dev, "SMB base address "
143 "uninitialized - upgrade BIOS or use "
144 "force_addr=0xaddr\n");
149 if (!request_region(piix4_smba, SMBIOSIZE, piix4_driver.name)) {
150 dev_err(&PIIX4_dev->dev, "SMB region 0x%x already in use!\n",
155 pci_read_config_byte(PIIX4_dev, SMBHSTCFG, &temp);
157 /* If force_addr is set, we program the new address here. Just to make
158 sure, we disable the PIIX4 first. */
160 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp & 0xfe);
161 pci_write_config_word(PIIX4_dev, SMBBA, piix4_smba);
162 pci_write_config_byte(PIIX4_dev, SMBHSTCFG, temp | 0x01);
163 dev_info(&PIIX4_dev->dev, "WARNING: SMBus interface set to "
164 "new address %04x!\n", piix4_smba);
165 } else if ((temp & 1) == 0) {
167 /* This should never need to be done, but has been
168 * noted that many Dell machines have the SMBus
169 * interface on the PIIX4 disabled!? NOTE: This assumes
170 * I/O space and other allocations WERE done by the
171 * Bios! Don't complain if your hardware does weird
172 * things after enabling this. :') Check for Bios
173 * updates before resorting to this.
175 pci_write_config_byte(PIIX4_dev, SMBHSTCFG,
177 dev_printk(KERN_NOTICE, &PIIX4_dev->dev,
178 "WARNING: SMBus interface has been "
179 "FORCEFULLY ENABLED!\n");
181 dev_err(&PIIX4_dev->dev,
182 "Host SMBus controller not enabled!\n");
183 release_region(piix4_smba, SMBIOSIZE);
189 if (((temp & 0x0E) == 8) || ((temp & 0x0E) == 2))
190 dev_dbg(&PIIX4_dev->dev, "Using Interrupt 9 for SMBus.\n");
191 else if ((temp & 0x0E) == 0)
192 dev_dbg(&PIIX4_dev->dev, "Using Interrupt SMI# for SMBus.\n");
194 dev_err(&PIIX4_dev->dev, "Illegal Interrupt configuration "
195 "(or code out of date)!\n");
197 pci_read_config_byte(PIIX4_dev, SMBREV, &temp);
198 dev_dbg(&PIIX4_dev->dev, "SMBREV = 0x%X\n", temp);
199 dev_dbg(&PIIX4_dev->dev, "SMBA = 0x%X\n", piix4_smba);
204 /* Another internally used function */
205 static int piix4_transaction(void)
211 dev_dbg(&piix4_adapter.dev, "Transaction (pre): CNT=%02x, CMD=%02x, "
212 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
213 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
216 /* Make sure the SMBus host is ready to start transmitting */
217 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
218 dev_dbg(&piix4_adapter.dev, "SMBus busy (%02x). "
219 "Resetting...\n", temp);
220 outb_p(temp, SMBHSTSTS);
221 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
222 dev_err(&piix4_adapter.dev, "Failed! (%02x)\n", temp);
225 dev_dbg(&piix4_adapter.dev, "Successful!\n");
229 /* start the transaction by setting bit 6 */
230 outb_p(inb(SMBHSTCNT) | 0x040, SMBHSTCNT);
232 /* We will always wait for a fraction of a second! (See PIIX4 docs errata) */
235 temp = inb_p(SMBHSTSTS);
236 } while ((temp & 0x01) && (timeout++ < MAX_TIMEOUT));
238 /* If the SMBus is still busy, we give up */
239 if (timeout >= MAX_TIMEOUT) {
240 dev_err(&piix4_adapter.dev, "SMBus Timeout!\n");
246 dev_err(&piix4_adapter.dev, "Error: Failed bus transaction\n");
251 dev_dbg(&piix4_adapter.dev, "Bus collision! SMBus may be "
252 "locked until next hard reset. (sorry!)\n");
253 /* Clock stops and slave is stuck in mid-transmission */
258 dev_dbg(&piix4_adapter.dev, "Error: no response!\n");
261 if (inb_p(SMBHSTSTS) != 0x00)
262 outb_p(inb(SMBHSTSTS), SMBHSTSTS);
264 if ((temp = inb_p(SMBHSTSTS)) != 0x00) {
265 dev_err(&piix4_adapter.dev, "Failed reset at end of "
266 "transaction (%02x)\n", temp);
268 dev_dbg(&piix4_adapter.dev, "Transaction (post): CNT=%02x, CMD=%02x, "
269 "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb_p(SMBHSTCNT),
270 inb_p(SMBHSTCMD), inb_p(SMBHSTADD), inb_p(SMBHSTDAT0),
275 /* Return -1 on error. */
276 static s32 piix4_access(struct i2c_adapter * adap, u16 addr,
277 unsigned short flags, char read_write,
278 u8 command, int size, union i2c_smbus_data * data)
283 case I2C_SMBUS_PROC_CALL:
284 dev_err(&adap->dev, "I2C_SMBUS_PROC_CALL not supported!\n");
286 case I2C_SMBUS_QUICK:
287 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
292 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
294 if (read_write == I2C_SMBUS_WRITE)
295 outb_p(command, SMBHSTCMD);
298 case I2C_SMBUS_BYTE_DATA:
299 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
301 outb_p(command, SMBHSTCMD);
302 if (read_write == I2C_SMBUS_WRITE)
303 outb_p(data->byte, SMBHSTDAT0);
304 size = PIIX4_BYTE_DATA;
306 case I2C_SMBUS_WORD_DATA:
307 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
309 outb_p(command, SMBHSTCMD);
310 if (read_write == I2C_SMBUS_WRITE) {
311 outb_p(data->word & 0xff, SMBHSTDAT0);
312 outb_p((data->word & 0xff00) >> 8, SMBHSTDAT1);
314 size = PIIX4_WORD_DATA;
316 case I2C_SMBUS_BLOCK_DATA:
317 outb_p(((addr & 0x7f) << 1) | (read_write & 0x01),
319 outb_p(command, SMBHSTCMD);
320 if (read_write == I2C_SMBUS_WRITE) {
321 len = data->block[0];
326 outb_p(len, SMBHSTDAT0);
327 i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
328 for (i = 1; i <= len; i++)
329 outb_p(data->block[i], SMBBLKDAT);
331 size = PIIX4_BLOCK_DATA;
335 outb_p((size & 0x1C) + (ENABLE_INT9 & 1), SMBHSTCNT);
337 if (piix4_transaction()) /* Error in transaction */
340 if ((read_write == I2C_SMBUS_WRITE) || (size == PIIX4_QUICK))
346 case PIIX4_BYTE_DATA:
347 data->byte = inb_p(SMBHSTDAT0);
349 case PIIX4_WORD_DATA:
350 data->word = inb_p(SMBHSTDAT0) + (inb_p(SMBHSTDAT1) << 8);
352 case PIIX4_BLOCK_DATA:
353 data->block[0] = inb_p(SMBHSTDAT0);
354 i = inb_p(SMBHSTCNT); /* Reset SMBBLKDAT */
355 for (i = 1; i <= data->block[0]; i++)
356 data->block[i] = inb_p(SMBBLKDAT);
362 static u32 piix4_func(struct i2c_adapter *adapter)
364 return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
365 I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
366 I2C_FUNC_SMBUS_BLOCK_DATA;
369 static const struct i2c_algorithm smbus_algorithm = {
370 .smbus_xfer = piix4_access,
371 .functionality = piix4_func,
374 static struct i2c_adapter piix4_adapter = {
375 .owner = THIS_MODULE,
376 .id = I2C_HW_SMBUS_PIIX4,
377 .class = I2C_CLASS_HWMON,
378 .algo = &smbus_algorithm,
381 static struct pci_device_id piix4_ids[] = {
382 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_3) },
383 { PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82443MX_3) },
384 { PCI_DEVICE(PCI_VENDOR_ID_EFAR, PCI_DEVICE_ID_EFAR_SLC90E66_3) },
385 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP200_SMBUS) },
386 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP300_SMBUS) },
387 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_IXP400_SMBUS) },
388 { PCI_DEVICE(PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS) },
389 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
390 PCI_DEVICE_ID_SERVERWORKS_OSB4) },
391 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
392 PCI_DEVICE_ID_SERVERWORKS_CSB5) },
393 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
394 PCI_DEVICE_ID_SERVERWORKS_CSB6) },
395 { PCI_DEVICE(PCI_VENDOR_ID_SERVERWORKS,
396 PCI_DEVICE_ID_SERVERWORKS_HT1000SB) },
400 MODULE_DEVICE_TABLE (pci, piix4_ids);
402 static int __devinit piix4_probe(struct pci_dev *dev,
403 const struct pci_device_id *id)
407 retval = piix4_setup(dev, id);
411 /* set up the sysfs linkage to our parent device */
412 piix4_adapter.dev.parent = &dev->dev;
414 snprintf(piix4_adapter.name, sizeof(piix4_adapter.name),
415 "SMBus PIIX4 adapter at %04x", piix4_smba);
417 if ((retval = i2c_add_adapter(&piix4_adapter))) {
418 dev_err(&dev->dev, "Couldn't register adapter!\n");
419 release_region(piix4_smba, SMBIOSIZE);
426 static void __devexit piix4_remove(struct pci_dev *dev)
429 i2c_del_adapter(&piix4_adapter);
430 release_region(piix4_smba, SMBIOSIZE);
435 static struct pci_driver piix4_driver = {
436 .name = "piix4_smbus",
437 .id_table = piix4_ids,
438 .probe = piix4_probe,
439 .remove = __devexit_p(piix4_remove),
442 static int __init i2c_piix4_init(void)
444 return pci_register_driver(&piix4_driver);
447 static void __exit i2c_piix4_exit(void)
449 pci_unregister_driver(&piix4_driver);
452 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl> and "
453 "Philip Edelbrock <phil@netroedge.com>");
454 MODULE_DESCRIPTION("PIIX4 SMBus driver");
455 MODULE_LICENSE("GPL");
457 module_init(i2c_piix4_init);
458 module_exit(i2c_piix4_exit);