/* voodoo3.c - Part of lm_sensors, Linux kernel modules for hardware monitoring Copyright (c) 1998, 1999 Frodo Looijaard , Philip Edelbrock , Ralph Metzler , and Mark D. Studebaker Based on code written by Ralph Metzler and Simon Vogl This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ /* This interfaces to the I2C bus of the Voodoo3 to gain access to the BT869 and possibly other I2C devices. */ #include #include #include #include #include #include #include "version.h" MODULE_LICENSE("GPL"); /* the only registers we use */ #define REG 0x78 #define REG2 0x70 /* bit locations in the register */ #define DDC_ENAB 0x00040000 #define DDC_SCL_OUT 0x00080000 #define DDC_SDA_OUT 0x00100000 #define DDC_SCL_IN 0x00200000 #define DDC_SDA_IN 0x00400000 #define I2C_ENAB 0x00800000 #define I2C_SCL_OUT 0x01000000 #define I2C_SDA_OUT 0x02000000 #define I2C_SCL_IN 0x04000000 #define I2C_SDA_IN 0x08000000 /* initialization states */ #define INIT2 0x2 #define INIT3 0x4 /* delays */ #define CYCLE_DELAY 10 #define TIMEOUT (HZ / 2) static void config_v3(struct pci_dev *dev); static unsigned char *mem; static inline void outlong(unsigned int dat) { *((unsigned int *) (mem + REG)) = dat; } static inline unsigned int readlong(void) { return *((unsigned int *) (mem + REG)); } /* The voo GPIO registers don't have individual masks for each bit so we always have to read before writing. */ static void bit_vooi2c_setscl(void *data, int val) { unsigned int r; r = readlong(); if(val) r |= I2C_SCL_OUT; else r &= ~I2C_SCL_OUT; outlong(r); readlong(); /* flush posted write */ } static void bit_vooi2c_setsda(void *data, int val) { unsigned int r; r = readlong(); if(val) r |= I2C_SDA_OUT; else r &= ~I2C_SDA_OUT; outlong(r); readlong(); /* flush posted write */ } /* The GPIO pins are open drain, so the pins always remain outputs. We rely on the i2c-algo-bit routines to set the pins high before reading the input from other chips. */ static int bit_vooi2c_getscl(void *data) { return (0 != (readlong() & I2C_SCL_IN)); } static int bit_vooi2c_getsda(void *data) { return (0 != (readlong() & I2C_SDA_IN)); } static void bit_vooddc_setscl(void *data, int val) { unsigned int r; r = readlong(); if(val) r |= DDC_SCL_OUT; else r &= ~DDC_SCL_OUT; outlong(r); readlong(); /* flush posted write */ } static void bit_vooddc_setsda(void *data, int val) { unsigned int r; r = readlong(); if(val) r |= DDC_SDA_OUT; else r &= ~DDC_SDA_OUT; outlong(r); readlong(); /* flush posted write */ } static int bit_vooddc_getscl(void *data) { return (0 != (readlong() & DDC_SCL_IN)); } static int bit_vooddc_getsda(void *data) { return (0 != (readlong() & DDC_SDA_IN)); } /* Configures the chip */ void config_v3(struct pci_dev *dev) { unsigned int cadr; /* map Voodoo3 memory */ cadr = dev->resource[0].start; cadr &= PCI_BASE_ADDRESS_MEM_MASK; mem = ioremap_nocache(cadr, 0x1000); if(mem) { *((unsigned int *) (mem + REG2)) = 0x8160; *((unsigned int *) (mem + REG)) = 0xcffc0020; printk("i2c-voodoo3: Using Banshee/Voodoo3 at 0x%p\n", mem); } } static struct i2c_algo_bit_data voo_i2c_bit_data = { .setsda = bit_vooi2c_setsda, .setscl = bit_vooi2c_setscl, .getsda = bit_vooi2c_getsda, .getscl = bit_vooi2c_getscl, .udelay = CYCLE_DELAY, .mdelay = CYCLE_DELAY, .timeout = TIMEOUT }; static struct i2c_adapter voodoo3_i2c_adapter = { .owner = THIS_MODULE, .name = "I2C Voodoo3/Banshee adapter", .id = I2C_HW_B_VOO, .algo_data = &voo_i2c_bit_data, }; static struct i2c_algo_bit_data voo_ddc_bit_data = { .setsda = bit_vooddc_setsda, .setscl = bit_vooddc_setscl, .getsda = bit_vooddc_getsda, .getscl = bit_vooddc_getscl, .udelay = CYCLE_DELAY, .mdelay = CYCLE_DELAY, .timeout = TIMEOUT }; static struct i2c_adapter voodoo3_ddc_adapter = { .owner = THIS_MODULE, .name = "DDC Voodoo3/Banshee adapter", .id = I2C_HW_B_VOO, .algo_data = &voo_ddc_bit_data, }; #if 0 PCI_VENDOR_ID_3DFX, PCI_DEVICE_ID_3DFX_VOODOO3, PCI_VENDOR_ID_3DFX, PCI_DEVICE_ID_3DFX_BANSHEE, #endif static struct pci_device_id voodoo3_ids[] __devinitdata = { { 0, } }; static int __devinit voodoo3_probe(struct pci_dev *dev, const struct pci_device_id *id) { if (voodoo3_setup()) { printk ("i2c-voodoo3.o: Voodoo3 not detected, module not inserted.\n"); return -ENODEV; } config_v3(dev); i2c_bit_add_bus(&voodoo3_i2c_adapter); i2c_bit_add_bus(&voodoo3_ddc_adapter); } static void __devexit voodoo3_remove(struct pci_dev *dev) { i2c_bit_del_bus(&voodoo3_i2c_adapter); i2c_bit_del_bus(&voodoo3_ddc_adapter); } static struct pci_driver voodoo3_driver = { .name = "voodoo3 smbus", .id_table = voodoo3_ids, .probe = voodoo3_probe, .remove = __devexit_p(voodoo3_remove), }; static int __init i2c_voodoo3_init(void) { printk("i2c-voodoo3.o version %s (%s)\n", LM_VERSION, LM_DATE); return pci_module_init(&voodoo3_driver); } static void __exit i2c_voodoo3_exit(void) { pci_unregister_driver(&voodoo3_driver); iounmap(mem); } MODULE_AUTHOR ("Frodo Looijaard , Philip Edelbrock , Ralph Metzler , and Mark D. Studebaker "); MODULE_DESCRIPTION("Voodoo3 I2C/SMBus driver"); module_init(i2c_voodoo3_init); module_exit(i2c_voodoo3_exit);