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/i2c.h> 261da177e4SLinus Torvalds #include <linux/i2c-algo-bit.h> 2721782180SH Hartley Sweeten #include <linux/io.h> 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds /* Power management registers */ 301da177e4SLinus Torvalds #define PM_CFG_REVID 0x08 /* silicon revision code */ 311da177e4SLinus Torvalds #define PM_CFG_IOBASE0 0x20 321da177e4SLinus Torvalds #define PM_CFG_IOBASE1 0x48 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds #define I2C_DIR (pm_io_base+0x40) 351da177e4SLinus Torvalds #define I2C_OUT (pm_io_base+0x42) 361da177e4SLinus Torvalds #define I2C_IN (pm_io_base+0x44) 371da177e4SLinus Torvalds #define I2C_SCL 0x02 /* clock bit in DIR/OUT/IN register */ 381da177e4SLinus Torvalds #define I2C_SDA 0x04 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds /* io-region reservation */ 411da177e4SLinus Torvalds #define IOSPACE 0x06 421da177e4SLinus Torvalds 43d6072f84SJean Delvare static struct pci_driver vt586b_driver; 4460507095SJean Delvare static u16 pm_io_base; 451da177e4SLinus Torvalds 461da177e4SLinus Torvalds /* 471da177e4SLinus Torvalds It does not appear from the datasheet that the GPIO pins are 481da177e4SLinus Torvalds open drain. So a we set a low value by setting the direction to 491da177e4SLinus Torvalds output and a high value by setting the direction to input and 501da177e4SLinus Torvalds relying on the required I2C pullup. The data value is initialized 511da177e4SLinus Torvalds to 0 in via_init() and never changed. 521da177e4SLinus Torvalds */ 531da177e4SLinus Torvalds static void bit_via_setscl(void *data, int state) 541da177e4SLinus Torvalds { 551da177e4SLinus Torvalds outb(state ? inb(I2C_DIR) & ~I2C_SCL : inb(I2C_DIR) | I2C_SCL, I2C_DIR); 561da177e4SLinus Torvalds } 571da177e4SLinus Torvalds 581da177e4SLinus Torvalds static void bit_via_setsda(void *data, int state) 591da177e4SLinus Torvalds { 601da177e4SLinus Torvalds outb(state ? inb(I2C_DIR) & ~I2C_SDA : inb(I2C_DIR) | I2C_SDA, I2C_DIR); 611da177e4SLinus Torvalds } 621da177e4SLinus Torvalds 631da177e4SLinus Torvalds static int bit_via_getscl(void *data) 641da177e4SLinus Torvalds { 651da177e4SLinus Torvalds return (0 != (inb(I2C_IN) & I2C_SCL)); 661da177e4SLinus Torvalds } 671da177e4SLinus Torvalds 681da177e4SLinus Torvalds static int bit_via_getsda(void *data) 691da177e4SLinus Torvalds { 701da177e4SLinus Torvalds return (0 != (inb(I2C_IN) & I2C_SDA)); 711da177e4SLinus Torvalds } 721da177e4SLinus Torvalds 731da177e4SLinus Torvalds 741da177e4SLinus Torvalds static struct i2c_algo_bit_data bit_data = { 751da177e4SLinus Torvalds .setsda = bit_via_setsda, 761da177e4SLinus Torvalds .setscl = bit_via_setscl, 771da177e4SLinus Torvalds .getsda = bit_via_getsda, 781da177e4SLinus Torvalds .getscl = bit_via_getscl, 791da177e4SLinus Torvalds .udelay = 5, 801da177e4SLinus Torvalds .timeout = HZ 811da177e4SLinus Torvalds }; 821da177e4SLinus Torvalds 831da177e4SLinus Torvalds static struct i2c_adapter vt586b_adapter = { 841da177e4SLinus Torvalds .owner = THIS_MODULE, 853401b2ffSJean Delvare .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, 861da177e4SLinus Torvalds .name = "VIA i2c", 871da177e4SLinus Torvalds .algo_data = &bit_data, 881da177e4SLinus Torvalds }; 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds 91392debf1SJingoo Han static const struct pci_device_id vt586b_ids[] = { 921da177e4SLinus Torvalds { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_3) }, 931da177e4SLinus Torvalds { 0, } 941da177e4SLinus Torvalds }; 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds MODULE_DEVICE_TABLE (pci, vt586b_ids); 971da177e4SLinus Torvalds 980b255e92SBill Pemberton static int vt586b_probe(struct pci_dev *dev, const struct pci_device_id *id) 991da177e4SLinus Torvalds { 1001da177e4SLinus Torvalds u16 base; 1011da177e4SLinus Torvalds u8 rev; 1021da177e4SLinus Torvalds int res; 1031da177e4SLinus Torvalds 1041da177e4SLinus Torvalds if (pm_io_base) { 1051da177e4SLinus Torvalds dev_err(&dev->dev, "i2c-via: Will only support one host\n"); 1061da177e4SLinus Torvalds return -ENODEV; 1071da177e4SLinus Torvalds } 1081da177e4SLinus Torvalds 1091da177e4SLinus Torvalds pci_read_config_byte(dev, PM_CFG_REVID, &rev); 1101da177e4SLinus Torvalds 1111da177e4SLinus Torvalds switch (rev) { 1121da177e4SLinus Torvalds case 0x00: 1131da177e4SLinus Torvalds base = PM_CFG_IOBASE0; 1141da177e4SLinus Torvalds break; 1151da177e4SLinus Torvalds case 0x01: 1161da177e4SLinus Torvalds case 0x10: 1171da177e4SLinus Torvalds base = PM_CFG_IOBASE1; 1181da177e4SLinus Torvalds break; 1191da177e4SLinus Torvalds 1201da177e4SLinus Torvalds default: 1211da177e4SLinus Torvalds base = PM_CFG_IOBASE1; 1221da177e4SLinus Torvalds /* later revision */ 1231da177e4SLinus Torvalds } 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvalds pci_read_config_word(dev, base, &pm_io_base); 1261da177e4SLinus Torvalds pm_io_base &= (0xff << 8); 1271da177e4SLinus Torvalds 128d6072f84SJean Delvare if (!request_region(I2C_DIR, IOSPACE, vt586b_driver.name)) { 1291da177e4SLinus Torvalds dev_err(&dev->dev, "IO 0x%x-0x%x already in use\n", I2C_DIR, I2C_DIR + IOSPACE); 1301da177e4SLinus Torvalds return -ENODEV; 1311da177e4SLinus Torvalds } 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds outb(inb(I2C_DIR) & ~(I2C_SDA | I2C_SCL), I2C_DIR); 1341da177e4SLinus Torvalds outb(inb(I2C_OUT) & ~(I2C_SDA | I2C_SCL), I2C_OUT); 1351da177e4SLinus Torvalds 136405ae7d3SRobert P. J. Day /* set up the sysfs linkage to our parent device */ 1371da177e4SLinus Torvalds vt586b_adapter.dev.parent = &dev->dev; 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds res = i2c_bit_add_bus(&vt586b_adapter); 1401da177e4SLinus Torvalds if ( res < 0 ) { 1411da177e4SLinus Torvalds release_region(I2C_DIR, IOSPACE); 1421da177e4SLinus Torvalds pm_io_base = 0; 1431da177e4SLinus Torvalds return res; 1441da177e4SLinus Torvalds } 1451da177e4SLinus Torvalds return 0; 1461da177e4SLinus Torvalds } 1471da177e4SLinus Torvalds 1480b255e92SBill Pemberton static void vt586b_remove(struct pci_dev *dev) 1491da177e4SLinus Torvalds { 1503269711bSJean Delvare i2c_del_adapter(&vt586b_adapter); 1511da177e4SLinus Torvalds release_region(I2C_DIR, IOSPACE); 1521da177e4SLinus Torvalds pm_io_base = 0; 1531da177e4SLinus Torvalds } 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds static struct pci_driver vt586b_driver = { 1571da177e4SLinus Torvalds .name = "vt586b_smbus", 1581da177e4SLinus Torvalds .id_table = vt586b_ids, 1591da177e4SLinus Torvalds .probe = vt586b_probe, 1600b255e92SBill Pemberton .remove = vt586b_remove, 1611da177e4SLinus Torvalds }; 1621da177e4SLinus Torvalds 16356f21788SAxel Lin module_pci_driver(vt586b_driver); 1641da177e4SLinus Torvalds 16596de0e25SJan Engelhardt MODULE_AUTHOR("Kyösti Mälkki <kmalkki@cc.hut.fi>"); 1661da177e4SLinus Torvalds MODULE_DESCRIPTION("i2c for Via vt82c586b southbridge"); 1671da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 168