Yidi Lin | d33ebd1 | 2016-03-15 14:38:44 +0800 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright 2016 MediaTek Inc. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
Duncan Laurie | ec00968 | 2016-06-07 15:38:14 -0700 | [diff] [blame] | 16 | #include <device/device.h> |
Yidi Lin | d33ebd1 | 2016-03-15 14:38:44 +0800 | [diff] [blame] | 17 | #include <device/i2c.h> |
Duncan Laurie | ec00968 | 2016-06-07 15:38:14 -0700 | [diff] [blame] | 18 | #include <stdint.h> |
| 19 | |
| 20 | #if ENV_RAMSTAGE |
| 21 | /* Return I2C operations for a bus */ |
| 22 | static inline const struct i2c_bus_operations *ops_i2c_bus(struct bus *bus) |
| 23 | { |
| 24 | if (bus && bus->dev && bus->dev->ops) |
| 25 | return bus->dev->ops->ops_i2c_bus; |
| 26 | return NULL; |
| 27 | } |
| 28 | |
| 29 | int i2c_dev_find_bus(struct device *dev) |
| 30 | { |
| 31 | const struct i2c_bus_operations *ops; |
| 32 | struct bus *pbus; |
| 33 | |
| 34 | if (!dev) |
| 35 | return -1; |
| 36 | |
| 37 | /* Locate parent bus with I2C controller ops */ |
| 38 | pbus = dev->bus; |
| 39 | while (pbus && pbus->dev && !ops_i2c_bus(pbus)) |
| 40 | if (pbus->dev->bus != pbus) |
| 41 | pbus = pbus->dev->bus; |
| 42 | |
| 43 | /* Check if this I2C controller ops implements dev_to_bus() */ |
| 44 | ops = ops_i2c_bus(pbus); |
| 45 | if (!ops || !ops->dev_to_bus) |
| 46 | return -1; |
| 47 | |
| 48 | /* Use controller ops to determine the bus number */ |
| 49 | return ops->dev_to_bus(pbus->dev); |
| 50 | } |
| 51 | |
| 52 | int i2c_dev_transfer(struct device *dev, struct i2c_seg *segments, int count) |
| 53 | { |
| 54 | int bus = i2c_dev_find_bus(dev); |
| 55 | if (bus < 0) |
| 56 | return -1; |
| 57 | return i2c_transfer(bus, segments, count); |
| 58 | } |
| 59 | |
| 60 | int i2c_dev_readb(struct device *dev, uint8_t reg, uint8_t *data) |
| 61 | { |
| 62 | int bus = i2c_dev_find_bus(dev); |
| 63 | if (bus < 0) |
| 64 | return -1; |
| 65 | return i2c_readb(bus, dev->path.i2c.device, reg, data); |
| 66 | } |
| 67 | |
| 68 | int i2c_dev_writeb(struct device *dev, uint8_t reg, uint8_t data) |
| 69 | { |
| 70 | int bus = i2c_dev_find_bus(dev); |
| 71 | if (bus < 0) |
| 72 | return -1; |
| 73 | return i2c_writeb(bus, dev->path.i2c.device, reg, data); |
| 74 | } |
| 75 | |
| 76 | int i2c_dev_read_bytes(struct device *dev, uint8_t reg, uint8_t *data, int len) |
| 77 | { |
| 78 | int bus = i2c_dev_find_bus(dev); |
| 79 | if (bus < 0) |
| 80 | return -1; |
| 81 | return i2c_read_bytes(bus, dev->path.i2c.device, reg, data, len); |
| 82 | } |
| 83 | |
| 84 | int i2c_dev_read_raw(struct device *dev, uint8_t *data, int len) |
| 85 | { |
| 86 | int bus = i2c_dev_find_bus(dev); |
| 87 | if (bus < 0) |
| 88 | return -1; |
| 89 | return i2c_read_raw(bus, dev->path.i2c.device, data, len); |
| 90 | } |
| 91 | |
| 92 | int i2c_dev_write_raw(struct device *dev, uint8_t *data, int len) |
| 93 | { |
| 94 | int bus = i2c_dev_find_bus(dev); |
| 95 | if (bus < 0) |
| 96 | return -1; |
| 97 | return i2c_write_raw(bus, dev->path.i2c.device, data, len); |
| 98 | } |
| 99 | #endif |
Yidi Lin | d33ebd1 | 2016-03-15 14:38:44 +0800 | [diff] [blame] | 100 | |
| 101 | int i2c_read_field(unsigned bus, uint8_t chip, uint8_t reg, uint8_t *data, |
| 102 | uint8_t mask, uint8_t shift) |
| 103 | { |
| 104 | int ret; |
| 105 | uint8_t buf = 0; |
| 106 | |
| 107 | ret = i2c_readb(bus, chip, reg, &buf); |
| 108 | |
| 109 | buf &= (mask << shift); |
| 110 | *data = (buf >> shift); |
| 111 | |
| 112 | return ret; |
| 113 | } |
| 114 | |
| 115 | int i2c_write_field(unsigned bus, uint8_t chip, uint8_t reg, uint8_t data, |
| 116 | uint8_t mask, uint8_t shift) |
| 117 | { |
| 118 | int ret; |
| 119 | uint8_t buf = 0; |
| 120 | |
| 121 | ret = i2c_readb(bus, chip, reg, &buf); |
| 122 | |
| 123 | buf &= ~(mask << shift); |
| 124 | buf |= (data << shift); |
| 125 | |
| 126 | ret |= i2c_writeb(bus, chip, reg, buf); |
| 127 | |
| 128 | return ret; |
| 129 | } |