/* i2c-i810.c - Part of lm_sensors, Linux kernel modules for hardware monitoring Copyright (c) 1998, 1999, 2000 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 I810/I815 to provide access to the DDC Bus and the I2C Bus. SUPPORTED DEVICES PCI ID i810AA 7121 i810AB 7123 i815 1132 */ #include #include #include #include #include #include #define LM_DATE "20011118" #define LM_VERSION "2.6.2" #include #ifdef MODULE_LICENSE MODULE_LICENSE("GPL"); #endif /* PCI defines */ #ifndef PCI_DEVICE_ID_INTEL_82810_IG1 #define PCI_DEVICE_ID_INTEL_82810_IG1 0x7121 #endif #ifndef PCI_DEVICE_ID_INTEL_82810_IG3 #define PCI_DEVICE_ID_INTEL_82810_IG3 0x7123 #endif #ifndef PCI_DEVICE_ID_INTEL_82815_2 #define PCI_DEVICE_ID_INTEL_82815_2 0x1132 #endif static int i810_supported[] = {PCI_DEVICE_ID_INTEL_82810_IG1, PCI_DEVICE_ID_INTEL_82810_IG3, PCI_DEVICE_ID_INTEL_82815_2, 0 }; /* GPIO register locations */ #define I810_IOCONTROL_OFFSET 0x5000 #define I810_HVSYNC 0x00 /* not used */ #define I810_GPIOA 0x10 #define I810_GPIOB 0x14 /* bit locations in the registers */ #define SCL_DIR_MASK 0x0001 #define SCL_DIR 0x0002 #define SCL_VAL_MASK 0x0004 #define SCL_VAL_OUT 0x0008 #define SCL_VAL_IN 0x0010 #define SDA_DIR_MASK 0x0100 #define SDA_DIR 0x0200 #define SDA_VAL_MASK 0x0400 #define SDA_VAL_OUT 0x0800 #define SDA_VAL_IN 0x1000 /* initialization states */ #define INIT1 0x1 #define INIT2 0x2 #define INIT3 0x4 /* delays */ #define CYCLE_DELAY 10 #define TIMEOUT 50 #ifdef MODULE static #else extern #endif int __init i2c_i810_init(void); static int __init i810i2c_cleanup(void); static int i810i2c_setup(void); static void config_i810(struct pci_dev *dev); static void i810_inc(struct i2c_adapter *adapter); static void i810_dec(struct i2c_adapter *adapter); #ifdef MODULE extern int init_module(void); extern int cleanup_module(void); #endif /* MODULE */ static int __initdata i810i2c_initialized; static unsigned char *mem; static inline void outlong(unsigned int dat, int off) { *((unsigned int *) (mem + off)) = dat; } static inline unsigned int readlong(int off) { return *((unsigned int *) (mem + off)); } /* The i810 GPIO registers have individual masks for each bit so we never have to read before writing. Nice. */ static void bit_i810i2c_setscl(void *data, int val) { outlong((val ? SCL_VAL_OUT : 0) | SCL_DIR | SCL_DIR_MASK | SCL_VAL_MASK, I810_GPIOB); } static void bit_i810i2c_setsda(void *data, int val) { outlong((val ? SDA_VAL_OUT : 0) | SDA_DIR | SDA_DIR_MASK | SDA_VAL_MASK, I810_GPIOB); } /* 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. Following guidance in the 815 prog. ref. guide, we do a "dummy write" of 0 to the register before reading which forces the input value to be latched. We presume this applies to the 810 as well. This is necessary to get i2c_algo_bit bit_test=1 to pass. */ static int bit_i810i2c_getscl(void *data) { outlong(0, I810_GPIOB); return (0 != (readlong(I810_GPIOB) & SCL_VAL_IN)); } static int bit_i810i2c_getsda(void *data) { outlong(0, I810_GPIOB); return (0 != (readlong(I810_GPIOB) & SDA_VAL_IN)); } static void bit_i810ddc_setscl(void *data, int val) { outlong((val ? SCL_VAL_OUT : 0) | SCL_DIR | SCL_DIR_MASK | SCL_VAL_MASK, I810_GPIOA); } static void bit_i810ddc_setsda(void *data, int val) { outlong((val ? SDA_VAL_OUT : 0) | SDA_DIR | SDA_DIR_MASK | SDA_VAL_MASK, I810_GPIOA); } static int bit_i810ddc_getscl(void *data) { outlong(0, I810_GPIOA); return (0 != (readlong(I810_GPIOA) & SCL_VAL_IN)); } static int bit_i810ddc_getsda(void *data) { outlong(0, I810_GPIOA); return (0 != (readlong(I810_GPIOA) & SDA_VAL_IN)); } static struct i2c_algo_bit_data i810_i2c_bit_data = { NULL, bit_i810i2c_setsda, bit_i810i2c_setscl, bit_i810i2c_getsda, bit_i810i2c_getscl, CYCLE_DELAY, CYCLE_DELAY, TIMEOUT }; static struct i2c_adapter i810_i2c_adapter = { "I810/I815 I2C Adapter", I2C_HW_B_I810, NULL, &i810_i2c_bit_data, i810_inc, i810_dec, NULL, NULL, }; static struct i2c_algo_bit_data i810_ddc_bit_data = { NULL, bit_i810ddc_setsda, bit_i810ddc_setscl, bit_i810ddc_getsda, bit_i810ddc_getscl, CYCLE_DELAY, CYCLE_DELAY, TIMEOUT }; static struct i2c_adapter i810_ddc_adapter = { "I810/I815 DDC Adapter", I2C_HW_B_I810, NULL, &i810_ddc_bit_data, i810_inc, i810_dec, NULL, NULL, }; /* Configures the chip */ void config_i810(struct pci_dev *dev) { unsigned long cadr; /* map I810 memory */ #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,3,13) cadr = dev->resource[1].start; #else cadr = dev->base_address[1]; #endif cadr += I810_IOCONTROL_OFFSET; cadr &= PCI_BASE_ADDRESS_MEM_MASK; mem = ioremap_nocache(cadr, 0x1000); bit_i810i2c_setscl(NULL, 1); bit_i810i2c_setsda(NULL, 1); bit_i810ddc_setscl(NULL, 1); bit_i810ddc_setsda(NULL, 1); } /* Detect whether a supported device can be found, and initialize it */ static int i810i2c_setup(void) { struct pci_dev *dev = NULL; int *num = i810_supported; do { if ((dev = pci_find_device(PCI_VENDOR_ID_INTEL, *num++, dev))) { config_i810(dev); printk("i2c-i810.o: i810/i815 found.\n"); return 0; } } while (*num != 0); return -ENODEV; } void i810_inc(struct i2c_adapter *adapter) { MOD_INC_USE_COUNT; } void i810_dec(struct i2c_adapter *adapter) { MOD_DEC_USE_COUNT; } int __init i2c_i810_init(void) { int res; printk("i2c-i810.o version %s (%s)\n", LM_VERSION, LM_DATE); i810i2c_initialized = 0; if ((res = i810i2c_setup())) { printk ("i2c-i810.o: i810/i815 not detected, module not inserted.\n"); i810i2c_cleanup(); return res; } if ((res = i2c_bit_add_bus(&i810_i2c_adapter))) { printk("i2c-i810.o: I2C adapter registration failed\n"); } else { printk("i2c-i810.o: I810/I815 I2C bus initialized\n"); i810i2c_initialized |= INIT2; } if ((res = i2c_bit_add_bus(&i810_ddc_adapter))) { printk("i2c-i810.o: DDC adapter registration failed\n"); } else { printk("i2c-i810.o: I810/I815 DDC bus initialized\n"); i810i2c_initialized |= INIT3; } if(!(i810i2c_initialized & (INIT2 | INIT3))) { printk("i2c-i810.o: Both registrations failed, module not inserted\n"); i810i2c_cleanup(); return res; } return 0; } int __init i810i2c_cleanup(void) { int res; iounmap(mem); if (i810i2c_initialized & INIT3) { if ((res = i2c_bit_del_bus(&i810_ddc_adapter))) { printk ("i2c-i810.o: i2c_del_adapter failed, module not removed\n"); return res; } } if (i810i2c_initialized & INIT2) { if ((res = i2c_bit_del_bus(&i810_i2c_adapter))) { printk ("i2c-i810.o: i2c_del_adapter failed, module not removed\n"); return res; } } i810i2c_initialized = 0; return 0; } EXPORT_NO_SYMBOLS; #ifdef MODULE MODULE_AUTHOR ("Frodo Looijaard , Philip Edelbrock , Ralph Metzler , and Mark D. Studebaker "); MODULE_DESCRIPTION("I810/I815 I2C/DDC driver"); int init_module(void) { return i2c_i810_init(); } int cleanup_module(void) { return i810i2c_cleanup(); } #endif /* MODULE */