/* 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 #define LM_DATE "20011118" #define LM_VERSION "2.6.2" #include #ifdef MODULE_LICENSE MODULE_LICENSE("GPL"); #endif /* 3DFX defines */ #ifndef PCI_DEVICE_ID_3DFX_VOODOO3 #define PCI_DEVICE_ID_3DFX_VOODOO3 0x05 #endif #ifndef PCI_DEVICE_ID_3DFX_BANSHEE #define PCI_DEVICE_ID_3DFX_BANSHEE 0x03 #endif /* 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 50 #ifdef MODULE static #else extern #endif int __init i2c_voodoo3_init(void); static int __init voodoo3_cleanup(void); static int voodoo3_setup(void); static void config_v3(struct pci_dev *dev); static void voodoo3_inc(struct i2c_adapter *adapter); static void voodoo3_dec(struct i2c_adapter *adapter); #ifdef MODULE extern int init_module(void); extern int cleanup_module(void); #endif /* MODULE */ static int __initdata voodoo3_initialized; static unsigned char *mem; extern inline void outlong(unsigned int dat) { *((unsigned int *) (mem + REG)) = dat; } extern 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); } 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); } /* 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); } 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); } 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)); } static struct i2c_algo_bit_data voo_i2c_bit_data = { NULL, bit_vooi2c_setsda, bit_vooi2c_setscl, bit_vooi2c_getsda, bit_vooi2c_getscl, CYCLE_DELAY, CYCLE_DELAY, TIMEOUT }; static struct i2c_adapter voodoo3_i2c_adapter = { "I2C Voodoo3/Banshee adapter", I2C_HW_B_VOO, NULL, &voo_i2c_bit_data, voodoo3_inc, voodoo3_dec, NULL, NULL, }; static struct i2c_algo_bit_data voo_ddc_bit_data = { NULL, bit_vooddc_setsda, bit_vooddc_setscl, bit_vooddc_getsda, bit_vooddc_getscl, CYCLE_DELAY, CYCLE_DELAY, TIMEOUT }; static struct i2c_adapter voodoo3_ddc_adapter = { "DDC Voodoo3/Banshee adapter", I2C_HW_B_VOO, NULL, &voo_ddc_bit_data, voodoo3_inc, voodoo3_dec, NULL, NULL, }; /* Configures the chip */ void config_v3(struct pci_dev *dev) { unsigned int cadr; /* map Voodoo3 memory */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,13) cadr = dev->resource[0].start; #else cadr = dev->base_address[0]; #endif cadr &= PCI_BASE_ADDRESS_MEM_MASK; mem = ioremap_nocache(cadr, 0x1000); *((unsigned int *) (mem + REG2)) = 0x8160; *((unsigned int *) (mem + REG)) = 0xcffc0020; printk("i2c-voodoo3: Using Banshee/Voodoo3 at 0x%p\n", mem); } /* Detect whether a Voodoo3 or a Banshee can be found, and initialize it. */ static int voodoo3_setup(void) { struct pci_dev *dev; int v3_num; v3_num = 0; dev = NULL; do { if ((dev = pci_find_device(PCI_VENDOR_ID_3DFX, PCI_DEVICE_ID_3DFX_VOODOO3, dev))) { if (!v3_num) config_v3(dev); v3_num++; } } while (dev); dev = NULL; do { if ((dev = pci_find_device(PCI_VENDOR_ID_3DFX, PCI_DEVICE_ID_3DFX_BANSHEE, dev))) { if (!v3_num) config_v3(dev); v3_num++; } } while (dev); if (v3_num > 0) { printk("i2c-voodoo3: %d Banshee/Voodoo3 found.\n", v3_num); if (v3_num > 1) printk("i2c-voodoo3: warning: only 1 supported.\n"); return 0; } else { printk("i2c-voodoo3: No Voodoo3 found.\n"); return -ENODEV; } } void voodoo3_inc(struct i2c_adapter *adapter) { MOD_INC_USE_COUNT; } void voodoo3_dec(struct i2c_adapter *adapter) { MOD_DEC_USE_COUNT; } int __init i2c_voodoo3_init(void) { int res; printk("i2c-voodoo3.o version %s (%s)\n", LM_VERSION, LM_DATE); voodoo3_initialized = 0; if ((res = voodoo3_setup())) { printk ("i2c-voodoo3.o: Voodoo3 not detected, module not inserted.\n"); voodoo3_cleanup(); return res; } if ((res = i2c_bit_add_bus(&voodoo3_i2c_adapter))) { printk("i2c-voodoo3.o: I2C adapter registration failed\n"); } else { printk("i2c-voodoo3.o: I2C bus initialized\n"); voodoo3_initialized |= INIT2; } if ((res = i2c_bit_add_bus(&voodoo3_ddc_adapter))) { printk("i2c-voodoo3.o: DDC adapter registration failed\n"); } else { printk("i2c-voodoo3.o: DDC bus initialized\n"); voodoo3_initialized |= INIT3; } if(!(voodoo3_initialized & (INIT2 | INIT3))) { printk("i2c-voodoo3.o: Both registrations failed, module not inserted\n"); voodoo3_cleanup(); return res; } return 0; } int __init voodoo3_cleanup(void) { int res; iounmap(mem); if (voodoo3_initialized & INIT3) { if ((res = i2c_bit_del_bus(&voodoo3_ddc_adapter))) { printk ("i2c-voodoo3.o: i2c_bit_del_bus failed, module not removed\n"); return res; } } if (voodoo3_initialized & INIT2) { if ((res = i2c_bit_del_bus(&voodoo3_i2c_adapter))) { printk ("i2c-voodoo3.o: i2c_bit_del_bus failed, module not removed\n"); return res; } } return 0; } EXPORT_NO_SYMBOLS; #ifdef MODULE MODULE_AUTHOR ("Frodo Looijaard , Philip Edelbrock , Ralph Metzler , and Mark D. Studebaker "); MODULE_DESCRIPTION("Voodoo3 I2C/SMBus driver"); int init_module(void) { return i2c_voodoo3_init(); } int cleanup_module(void) { return voodoo3_cleanup(); } #endif /* MODULE */