11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds i2c Support for Via Technologies 82C586B South Bridge 31da177e4SLinus Torvalds 496de0e25SJan Engelhardt Copyright (c) 1998, 1999 Kyösti Mälkki <kmalkki@cc.hut.fi> 51da177e4SLinus Torvalds 61da177e4SLinus Torvalds This program is free software; you can redistribute it and/or modify 71da177e4SLinus Torvalds it under the terms of the GNU General Public License as published by 81da177e4SLinus Torvalds the Free Software Foundation; either version 2 of the License, or 91da177e4SLinus Torvalds (at your option) any later version. 101da177e4SLinus Torvalds 111da177e4SLinus Torvalds This program is distributed in the hope that it will be useful, 121da177e4SLinus Torvalds but WITHOUT ANY WARRANTY; without even the implied warranty of 131da177e4SLinus Torvalds MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 141da177e4SLinus Torvalds GNU General Public License for more details. 151da177e4SLinus Torvalds 161da177e4SLinus Torvalds You should have received a copy of the GNU General Public License 171da177e4SLinus Torvalds along with this program; if not, write to the Free Software 181da177e4SLinus Torvalds Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 191da177e4SLinus Torvalds */ 201da177e4SLinus Torvalds 211da177e4SLinus Torvalds #include <linux/kernel.h> 221da177e4SLinus Torvalds #include <linux/module.h> 231da177e4SLinus Torvalds #include <linux/pci.h> 241da177e4SLinus Torvalds #include <linux/ioport.h> 251da177e4SLinus Torvalds #include <linux/init.h> 261da177e4SLinus Torvalds #include <linux/i2c.h> 271da177e4SLinus Torvalds #include <linux/i2c-algo-bit.h> 2821782180SH Hartley Sweeten #include <linux/io.h> 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds /* Power management registers */ 311da177e4SLinus Torvalds #define PM_CFG_REVID 0x08 /* silicon revision code */ 321da177e4SLinus Torvalds #define PM_CFG_IOBASE0 0x20 331da177e4SLinus Torvalds #define PM_CFG_IOBASE1 0x48 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds #define I2C_DIR (pm_io_base+0x40) 361da177e4SLinus Torvalds #define I2C_OUT (pm_io_base+0x42) 371da177e4SLinus Torvalds #define I2C_IN (pm_io_base+0x44) 381da177e4SLinus Torvalds #define I2C_SCL 0x02 /* clock bit in DIR/OUT/IN register */ 391da177e4SLinus Torvalds #define I2C_SDA 0x04 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds /* io-region reservation */ 421da177e4SLinus Torvalds #define IOSPACE 0x06 431da177e4SLinus Torvalds 44d6072f84SJean Delvare static struct pci_driver vt586b_driver; 4560507095SJean Delvare static u16 pm_io_base; 461da177e4SLinus Torvalds 471da177e4SLinus Torvalds /* 481da177e4SLinus Torvalds It does not appear from the datasheet that the GPIO pins are 491da177e4SLinus Torvalds open drain. So a we set a low value by setting the direction to 501da177e4SLinus Torvalds output and a high value by setting the direction to input and 511da177e4SLinus Torvalds relying on the required I2C pullup. The data value is initialized 521da177e4SLinus Torvalds to 0 in via_init() and never changed. 531da177e4SLinus Torvalds */ 541da177e4SLinus Torvalds static void bit_via_setscl(void *data, int state) 551da177e4SLinus Torvalds { 561da177e4SLinus Torvalds outb(state ? inb(I2C_DIR) & ~I2C_SCL : inb(I2C_DIR) | I2C_SCL, I2C_DIR); 571da177e4SLinus Torvalds } 581da177e4SLinus Torvalds 591da177e4SLinus Torvalds static void bit_via_setsda(void *data, int state) 601da177e4SLinus Torvalds { 611da177e4SLinus Torvalds outb(state ? inb(I2C_DIR) & ~I2C_SDA : inb(I2C_DIR) | I2C_SDA, I2C_DIR); 621da177e4SLinus Torvalds } 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds static int bit_via_getscl(void *data) 651da177e4SLinus Torvalds { 661da177e4SLinus Torvalds return (0 != (inb(I2C_IN) & I2C_SCL)); 671da177e4SLinus Torvalds } 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds static int bit_via_getsda(void *data) 701da177e4SLinus Torvalds { 711da177e4SLinus Torvalds return (0 != (inb(I2C_IN) & I2C_SDA)); 721da177e4SLinus Torvalds } 731da177e4SLinus Torvalds 741da177e4SLinus Torvalds 751da177e4SLinus Torvalds static struct i2c_algo_bit_data bit_data = { 761da177e4SLinus Torvalds .setsda = bit_via_setsda, 771da177e4SLinus Torvalds .setscl = bit_via_setscl, 781da177e4SLinus Torvalds .getsda = bit_via_getsda, 791da177e4SLinus Torvalds .getscl = bit_via_getscl, 801da177e4SLinus Torvalds .udelay = 5, 811da177e4SLinus Torvalds .timeout = HZ 821da177e4SLinus Torvalds }; 831da177e4SLinus Torvalds 841da177e4SLinus Torvalds static struct i2c_adapter vt586b_adapter = { 851da177e4SLinus Torvalds .owner = THIS_MODULE, 863401b2ffSJean Delvare .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, 871da177e4SLinus Torvalds .name = "VIA i2c", 881da177e4SLinus Torvalds .algo_data = &bit_data, 891da177e4SLinus Torvalds }; 901da177e4SLinus Torvalds 911da177e4SLinus Torvalds 924111ecd2SMárton Németh static const struct pci_device_id vt586b_ids[] __devinitconst = { 931da177e4SLinus Torvalds { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_3) }, 941da177e4SLinus Torvalds { 0, } 951da177e4SLinus Torvalds }; 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds MODULE_DEVICE_TABLE (pci, vt586b_ids); 981da177e4SLinus Torvalds 991da177e4SLinus Torvalds static int __devinit vt586b_probe(struct pci_dev *dev, const struct pci_device_id *id) 1001da177e4SLinus Torvalds { 1011da177e4SLinus Torvalds u16 base; 1021da177e4SLinus Torvalds u8 rev; 1031da177e4SLinus Torvalds int res; 1041da177e4SLinus Torvalds 1051da177e4SLinus Torvalds if (pm_io_base) { 1061da177e4SLinus Torvalds dev_err(&dev->dev, "i2c-via: Will only support one host\n"); 1071da177e4SLinus Torvalds return -ENODEV; 1081da177e4SLinus Torvalds } 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds pci_read_config_byte(dev, PM_CFG_REVID, &rev); 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds switch (rev) { 1131da177e4SLinus Torvalds case 0x00: 1141da177e4SLinus Torvalds base = PM_CFG_IOBASE0; 1151da177e4SLinus Torvalds break; 1161da177e4SLinus Torvalds case 0x01: 1171da177e4SLinus Torvalds case 0x10: 1181da177e4SLinus Torvalds base = PM_CFG_IOBASE1; 1191da177e4SLinus Torvalds break; 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds default: 1221da177e4SLinus Torvalds base = PM_CFG_IOBASE1; 1231da177e4SLinus Torvalds /* later revision */ 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds pci_read_config_word(dev, base, &pm_io_base); 1271da177e4SLinus Torvalds pm_io_base &= (0xff << 8); 1281da177e4SLinus Torvalds 129d6072f84SJean Delvare if (!request_region(I2C_DIR, IOSPACE, vt586b_driver.name)) { 1301da177e4SLinus Torvalds dev_err(&dev->dev, "IO 0x%x-0x%x already in use\n", I2C_DIR, I2C_DIR + IOSPACE); 1311da177e4SLinus Torvalds return -ENODEV; 1321da177e4SLinus Torvalds } 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds outb(inb(I2C_DIR) & ~(I2C_SDA | I2C_SCL), I2C_DIR); 1351da177e4SLinus Torvalds outb(inb(I2C_OUT) & ~(I2C_SDA | I2C_SCL), I2C_OUT); 1361da177e4SLinus Torvalds 137405ae7d3SRobert P. J. Day /* set up the sysfs linkage to our parent device */ 1381da177e4SLinus Torvalds vt586b_adapter.dev.parent = &dev->dev; 1391da177e4SLinus Torvalds 1401da177e4SLinus Torvalds res = i2c_bit_add_bus(&vt586b_adapter); 1411da177e4SLinus Torvalds if ( res < 0 ) { 1421da177e4SLinus Torvalds release_region(I2C_DIR, IOSPACE); 1431da177e4SLinus Torvalds pm_io_base = 0; 1441da177e4SLinus Torvalds return res; 1451da177e4SLinus Torvalds } 1461da177e4SLinus Torvalds return 0; 1471da177e4SLinus Torvalds } 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvalds static void __devexit vt586b_remove(struct pci_dev *dev) 1501da177e4SLinus Torvalds { 1513269711bSJean Delvare i2c_del_adapter(&vt586b_adapter); 1521da177e4SLinus Torvalds release_region(I2C_DIR, IOSPACE); 1531da177e4SLinus Torvalds pm_io_base = 0; 1541da177e4SLinus Torvalds } 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds 1571da177e4SLinus Torvalds static struct pci_driver vt586b_driver = { 1581da177e4SLinus Torvalds .name = "vt586b_smbus", 1591da177e4SLinus Torvalds .id_table = vt586b_ids, 1601da177e4SLinus Torvalds .probe = vt586b_probe, 1611da177e4SLinus Torvalds .remove = __devexit_p(vt586b_remove), 1621da177e4SLinus Torvalds }; 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds static int __init i2c_vt586b_init(void) 1651da177e4SLinus Torvalds { 1661da177e4SLinus Torvalds return pci_register_driver(&vt586b_driver); 1671da177e4SLinus Torvalds } 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds static void __exit i2c_vt586b_exit(void) 1701da177e4SLinus Torvalds { 1711da177e4SLinus Torvalds pci_unregister_driver(&vt586b_driver); 1721da177e4SLinus Torvalds } 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds 17596de0e25SJan Engelhardt MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>"); 1761da177e4SLinus Torvalds MODULE_DESCRIPTION("i2c for Via vt82c586b southbridge"); 1771da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds module_init(i2c_vt586b_init); 1801da177e4SLinus Torvalds module_exit(i2c_vt586b_exit); 181