11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds i2c-via.c - Part of lm_sensors, Linux kernel modules 31da177e4SLinus Torvalds for hardware monitoring 41da177e4SLinus Torvalds 51da177e4SLinus Torvalds i2c Support for Via Technologies 82C586B South Bridge 61da177e4SLinus Torvalds 71da177e4SLinus Torvalds Copyright (c) 1998, 1999 Ky�sti M�lkki <kmalkki@cc.hut.fi> 81da177e4SLinus Torvalds 91da177e4SLinus Torvalds This program is free software; you can redistribute it and/or modify 101da177e4SLinus Torvalds it under the terms of the GNU General Public License as published by 111da177e4SLinus Torvalds the Free Software Foundation; either version 2 of the License, or 121da177e4SLinus Torvalds (at your option) any later version. 131da177e4SLinus Torvalds 141da177e4SLinus Torvalds This program is distributed in the hope that it will be useful, 151da177e4SLinus Torvalds but WITHOUT ANY WARRANTY; without even the implied warranty of 161da177e4SLinus Torvalds MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 171da177e4SLinus Torvalds GNU General Public License for more details. 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds You should have received a copy of the GNU General Public License 201da177e4SLinus Torvalds along with this program; if not, write to the Free Software 211da177e4SLinus Torvalds Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 221da177e4SLinus Torvalds */ 231da177e4SLinus Torvalds 241da177e4SLinus Torvalds #include <linux/config.h> 251da177e4SLinus Torvalds #include <linux/kernel.h> 261da177e4SLinus Torvalds #include <linux/module.h> 271da177e4SLinus Torvalds #include <linux/pci.h> 281da177e4SLinus Torvalds #include <linux/ioport.h> 291da177e4SLinus Torvalds #include <linux/init.h> 301da177e4SLinus Torvalds #include <linux/i2c.h> 311da177e4SLinus Torvalds #include <linux/i2c-algo-bit.h> 321da177e4SLinus Torvalds #include <asm/io.h> 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds /* Power management registers */ 351da177e4SLinus Torvalds #define PM_CFG_REVID 0x08 /* silicon revision code */ 361da177e4SLinus Torvalds #define PM_CFG_IOBASE0 0x20 371da177e4SLinus Torvalds #define PM_CFG_IOBASE1 0x48 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds #define I2C_DIR (pm_io_base+0x40) 401da177e4SLinus Torvalds #define I2C_OUT (pm_io_base+0x42) 411da177e4SLinus Torvalds #define I2C_IN (pm_io_base+0x44) 421da177e4SLinus Torvalds #define I2C_SCL 0x02 /* clock bit in DIR/OUT/IN register */ 431da177e4SLinus Torvalds #define I2C_SDA 0x04 441da177e4SLinus Torvalds 451da177e4SLinus Torvalds /* io-region reservation */ 461da177e4SLinus Torvalds #define IOSPACE 0x06 471da177e4SLinus Torvalds #define IOTEXT "via-i2c" 481da177e4SLinus Torvalds 491da177e4SLinus Torvalds static u16 pm_io_base = 0; 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds /* 521da177e4SLinus Torvalds It does not appear from the datasheet that the GPIO pins are 531da177e4SLinus Torvalds open drain. So a we set a low value by setting the direction to 541da177e4SLinus Torvalds output and a high value by setting the direction to input and 551da177e4SLinus Torvalds relying on the required I2C pullup. The data value is initialized 561da177e4SLinus Torvalds to 0 in via_init() and never changed. 571da177e4SLinus Torvalds */ 581da177e4SLinus Torvalds static void bit_via_setscl(void *data, int state) 591da177e4SLinus Torvalds { 601da177e4SLinus Torvalds outb(state ? inb(I2C_DIR) & ~I2C_SCL : inb(I2C_DIR) | I2C_SCL, I2C_DIR); 611da177e4SLinus Torvalds } 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds static void bit_via_setsda(void *data, int state) 641da177e4SLinus Torvalds { 651da177e4SLinus Torvalds outb(state ? inb(I2C_DIR) & ~I2C_SDA : inb(I2C_DIR) | I2C_SDA, I2C_DIR); 661da177e4SLinus Torvalds } 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds static int bit_via_getscl(void *data) 691da177e4SLinus Torvalds { 701da177e4SLinus Torvalds return (0 != (inb(I2C_IN) & I2C_SCL)); 711da177e4SLinus Torvalds } 721da177e4SLinus Torvalds 731da177e4SLinus Torvalds static int bit_via_getsda(void *data) 741da177e4SLinus Torvalds { 751da177e4SLinus Torvalds return (0 != (inb(I2C_IN) & I2C_SDA)); 761da177e4SLinus Torvalds } 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds static struct i2c_algo_bit_data bit_data = { 801da177e4SLinus Torvalds .setsda = bit_via_setsda, 811da177e4SLinus Torvalds .setscl = bit_via_setscl, 821da177e4SLinus Torvalds .getsda = bit_via_getsda, 831da177e4SLinus Torvalds .getscl = bit_via_getscl, 841da177e4SLinus Torvalds .udelay = 5, 851da177e4SLinus Torvalds .mdelay = 5, 861da177e4SLinus Torvalds .timeout = HZ 871da177e4SLinus Torvalds }; 881da177e4SLinus Torvalds 891da177e4SLinus Torvalds static struct i2c_adapter vt586b_adapter = { 901da177e4SLinus Torvalds .owner = THIS_MODULE, 911da177e4SLinus Torvalds .class = I2C_CLASS_HWMON, 921da177e4SLinus Torvalds .name = "VIA i2c", 931da177e4SLinus Torvalds .algo_data = &bit_data, 941da177e4SLinus Torvalds }; 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds 971da177e4SLinus Torvalds static struct pci_device_id vt586b_ids[] __devinitdata = { 981da177e4SLinus Torvalds { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_3) }, 991da177e4SLinus Torvalds { 0, } 1001da177e4SLinus Torvalds }; 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvalds MODULE_DEVICE_TABLE (pci, vt586b_ids); 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds static int __devinit vt586b_probe(struct pci_dev *dev, const struct pci_device_id *id) 1051da177e4SLinus Torvalds { 1061da177e4SLinus Torvalds u16 base; 1071da177e4SLinus Torvalds u8 rev; 1081da177e4SLinus Torvalds int res; 1091da177e4SLinus Torvalds 1101da177e4SLinus Torvalds if (pm_io_base) { 1111da177e4SLinus Torvalds dev_err(&dev->dev, "i2c-via: Will only support one host\n"); 1121da177e4SLinus Torvalds return -ENODEV; 1131da177e4SLinus Torvalds } 1141da177e4SLinus Torvalds 1151da177e4SLinus Torvalds pci_read_config_byte(dev, PM_CFG_REVID, &rev); 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds switch (rev) { 1181da177e4SLinus Torvalds case 0x00: 1191da177e4SLinus Torvalds base = PM_CFG_IOBASE0; 1201da177e4SLinus Torvalds break; 1211da177e4SLinus Torvalds case 0x01: 1221da177e4SLinus Torvalds case 0x10: 1231da177e4SLinus Torvalds base = PM_CFG_IOBASE1; 1241da177e4SLinus Torvalds break; 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds default: 1271da177e4SLinus Torvalds base = PM_CFG_IOBASE1; 1281da177e4SLinus Torvalds /* later revision */ 1291da177e4SLinus Torvalds } 1301da177e4SLinus Torvalds 1311da177e4SLinus Torvalds pci_read_config_word(dev, base, &pm_io_base); 1321da177e4SLinus Torvalds pm_io_base &= (0xff << 8); 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds if (!request_region(I2C_DIR, IOSPACE, IOTEXT)) { 1351da177e4SLinus Torvalds dev_err(&dev->dev, "IO 0x%x-0x%x already in use\n", I2C_DIR, I2C_DIR + IOSPACE); 1361da177e4SLinus Torvalds return -ENODEV; 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds outb(inb(I2C_DIR) & ~(I2C_SDA | I2C_SCL), I2C_DIR); 1401da177e4SLinus Torvalds outb(inb(I2C_OUT) & ~(I2C_SDA | I2C_SCL), I2C_OUT); 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds /* set up the driverfs linkage to our parent device */ 1431da177e4SLinus Torvalds vt586b_adapter.dev.parent = &dev->dev; 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds res = i2c_bit_add_bus(&vt586b_adapter); 1461da177e4SLinus Torvalds if ( res < 0 ) { 1471da177e4SLinus Torvalds release_region(I2C_DIR, IOSPACE); 1481da177e4SLinus Torvalds pm_io_base = 0; 1491da177e4SLinus Torvalds return res; 1501da177e4SLinus Torvalds } 1511da177e4SLinus Torvalds return 0; 1521da177e4SLinus Torvalds } 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds static void __devexit vt586b_remove(struct pci_dev *dev) 1551da177e4SLinus Torvalds { 1561da177e4SLinus Torvalds i2c_bit_del_bus(&vt586b_adapter); 1571da177e4SLinus Torvalds release_region(I2C_DIR, IOSPACE); 1581da177e4SLinus Torvalds pm_io_base = 0; 1591da177e4SLinus Torvalds } 1601da177e4SLinus Torvalds 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds static struct pci_driver vt586b_driver = { 1631da177e4SLinus Torvalds .name = "vt586b_smbus", 1641da177e4SLinus Torvalds .id_table = vt586b_ids, 1651da177e4SLinus Torvalds .probe = vt586b_probe, 1661da177e4SLinus Torvalds .remove = __devexit_p(vt586b_remove), 1671da177e4SLinus Torvalds }; 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvalds static int __init i2c_vt586b_init(void) 1701da177e4SLinus Torvalds { 1711da177e4SLinus Torvalds return pci_register_driver(&vt586b_driver); 1721da177e4SLinus Torvalds } 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds static void __exit i2c_vt586b_exit(void) 1751da177e4SLinus Torvalds { 1761da177e4SLinus Torvalds pci_unregister_driver(&vt586b_driver); 1771da177e4SLinus Torvalds } 1781da177e4SLinus Torvalds 1791da177e4SLinus Torvalds 1801da177e4SLinus Torvalds MODULE_AUTHOR("Ky�sti M�lkki <kmalkki@cc.hut.fi>"); 1811da177e4SLinus Torvalds MODULE_DESCRIPTION("i2c for Via vt82c586b southbridge"); 1821da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 1831da177e4SLinus Torvalds 1841da177e4SLinus Torvalds module_init(i2c_vt586b_init); 1851da177e4SLinus Torvalds module_exit(i2c_vt586b_exit); 186