/* * This file is part of the coreboot project. * * Copyright 2016 MediaTek Inc. * * 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; version 2 of the License. * * 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. */ #include <device/device.h> #include <device/i2c.h> #include <stdint.h> #if ENV_RAMSTAGE /* Return I2C operations for a bus */ static inline const struct i2c_bus_operations *ops_i2c_bus(struct bus *bus) { if (bus && bus->dev && bus->dev->ops) return bus->dev->ops->ops_i2c_bus; return NULL; } int i2c_dev_find_bus(struct device *dev) { const struct i2c_bus_operations *ops; struct bus *pbus; if (!dev) return -1; /* Locate parent bus with I2C controller ops */ pbus = dev->bus; while (pbus && pbus->dev && !ops_i2c_bus(pbus)) if (pbus->dev->bus != pbus) pbus = pbus->dev->bus; /* Check if this I2C controller ops implements dev_to_bus() */ ops = ops_i2c_bus(pbus); if (!ops || !ops->dev_to_bus) return -1; /* Use controller ops to determine the bus number */ return ops->dev_to_bus(pbus->dev); } int i2c_dev_transfer(struct device *dev, struct i2c_seg *segments, int count) { int bus = i2c_dev_find_bus(dev); if (bus < 0) return -1; return i2c_transfer(bus, segments, count); } int i2c_dev_readb(struct device *dev, uint8_t reg, uint8_t *data) { int bus = i2c_dev_find_bus(dev); if (bus < 0) return -1; return i2c_readb(bus, dev->path.i2c.device, reg, data); } int i2c_dev_writeb(struct device *dev, uint8_t reg, uint8_t data) { int bus = i2c_dev_find_bus(dev); if (bus < 0) return -1; return i2c_writeb(bus, dev->path.i2c.device, reg, data); } int i2c_dev_read_bytes(struct device *dev, uint8_t reg, uint8_t *data, int len) { int bus = i2c_dev_find_bus(dev); if (bus < 0) return -1; return i2c_read_bytes(bus, dev->path.i2c.device, reg, data, len); } int i2c_dev_read_raw(struct device *dev, uint8_t *data, int len) { int bus = i2c_dev_find_bus(dev); if (bus < 0) return -1; return i2c_read_raw(bus, dev->path.i2c.device, data, len); } int i2c_dev_write_raw(struct device *dev, uint8_t *data, int len) { int bus = i2c_dev_find_bus(dev); if (bus < 0) return -1; return i2c_write_raw(bus, dev->path.i2c.device, data, len); } #endif int i2c_read_field(unsigned bus, uint8_t chip, uint8_t reg, uint8_t *data, uint8_t mask, uint8_t shift) { int ret; uint8_t buf = 0; ret = i2c_readb(bus, chip, reg, &buf); buf &= (mask << shift); *data = (buf >> shift); return ret; } int i2c_write_field(unsigned bus, uint8_t chip, uint8_t reg, uint8_t data, uint8_t mask, uint8_t shift) { int ret; uint8_t buf = 0; ret = i2c_readb(bus, chip, reg, &buf); buf &= ~(mask << shift); buf |= (data << shift); ret |= i2c_writeb(bus, chip, reg, buf); return ret; }