/* SPDX-License-Identifier: GPL-2.0-only */ #ifndef __DEVICE_SMBUS_HOST_H__ #define __DEVICE_SMBUS_HOST_H__ #include <stddef.h> #include <stdint.h> #include <console/console.h> /* Low-level SMBUS host controller. */ int do_smbus_recv_byte(uintptr_t base, u8 device); int do_smbus_send_byte(uintptr_t base, u8 device, u8 val); int do_smbus_read_byte(uintptr_t base, u8 device, u8 address); int do_smbus_write_byte(uintptr_t base, u8 device, u8 address, u8 data); int do_smbus_read_word(uintptr_t base, u8 device, u8 address); int do_smbus_write_word(uintptr_t base, u8 device, u8 address, u16 data); int do_smbus_block_read(uintptr_t base, u8 device, u8 cmd, size_t max_bytes, u8 *buf); int do_smbus_block_write(uintptr_t base, u8 device, u8 cmd, size_t bytes, const u8 *buf); int do_smbus_process_call(uintptr_t base, u8 device, u8 cmd, u16 data, u16 *buf); /* For Intel, implemented since ICH5. */ int do_i2c_eeprom_read(uintptr_t base, u8 device, u8 offset, size_t bytes, u8 *buf); int do_i2c_block_write(uintptr_t base, u8 device, size_t bytes, u8 *buf); /* Upstream API */ uintptr_t smbus_base(void); int smbus_enable_iobar(uintptr_t base); void smbus_host_reset(uintptr_t base); void smbus_set_slave_addr(uintptr_t base, u8 slave_address); static inline void enable_smbus(void) { uintptr_t base = smbus_base(); if (smbus_enable_iobar(base) < 0) die("SMBus controller not found!"); smbus_host_reset(base); printk(BIOS_DEBUG, "SMBus controller enabled\n"); } #if DEVTREE_EARLY static inline int smbus_read_byte(u8 device, u8 address) { uintptr_t base = smbus_base(); return do_smbus_read_byte(base, device, address); } static inline int smbus_read_word(u8 device, u8 address) { uintptr_t base = smbus_base(); return do_smbus_read_word(base, device, address); } static inline int smbus_write_byte(u8 device, u8 address, u8 data) { uintptr_t base = smbus_base(); return do_smbus_write_byte(base, device, address, data); } static inline int smbus_block_read(u8 device, u8 cmd, size_t max_bytes, u8 *buf) { uintptr_t base = smbus_base(); return do_smbus_block_read(base, device, cmd, max_bytes, buf); } static inline int smbus_block_write(u8 device, u8 cmd, size_t bytes, const u8 *buf) { uintptr_t base = smbus_base(); return do_smbus_block_write(base, device, cmd, bytes, buf); } static inline int i2c_eeprom_read(u8 device, u8 offset, size_t bytes, u8 *buf) { uintptr_t base = smbus_base(); return do_i2c_eeprom_read(base, device, offset, bytes, buf); } #endif #endif