diff options
| -rw-r--r-- | src/device/Makefile.inc | 5 | ||||
| -rw-r--r-- | src/device/i2c.c | 46 | ||||
| -rw-r--r-- | src/include/device/i2c.h | 5 |
3 files changed, 56 insertions, 0 deletions
diff --git a/src/device/Makefile.inc b/src/device/Makefile.inc index c2ade9675f..6bad0cde83 100644 --- a/src/device/Makefile.inc +++ b/src/device/Makefile.inc @@ -31,3 +31,8 @@ bootblock-$(CONFIG_SOFTWARE_I2C) += software_i2c.c verstage-$(CONFIG_SOFTWARE_I2C) += software_i2c.c romstage-$(CONFIG_SOFTWARE_I2C) += software_i2c.c ramstage-$(CONFIG_SOFTWARE_I2C) += software_i2c.c + +bootblock-y += i2c.c +verstage-y += i2c.c +romstage-y += i2c.c +ramstage-y += i2c.c diff --git a/src/device/i2c.c b/src/device/i2c.c new file mode 100644 index 0000000000..53bfdf0c94 --- /dev/null +++ b/src/device/i2c.c @@ -0,0 +1,46 @@ +/* + * 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/i2c.h> + +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; +} diff --git a/src/include/device/i2c.h b/src/include/device/i2c.h index 8e59ba7c21..b152bb98c2 100644 --- a/src/include/device/i2c.h +++ b/src/include/device/i2c.h @@ -45,6 +45,11 @@ void software_i2c_wedge_ack(unsigned bus, u8 chip); void software_i2c_wedge_read(unsigned bus, u8 chip, u8 reg, int bit_count); void software_i2c_wedge_write(unsigned bus, u8 chip, u8 reg, int bit_count); +int i2c_read_field(unsigned bus, uint8_t chip, uint8_t reg, uint8_t *data, + uint8_t mask, uint8_t shift); +int i2c_write_field(unsigned bus, uint8_t chip, uint8_t reg, uint8_t data, + uint8_t mask, uint8_t shift); + /* * software_i2c is supposed to be a debug feature. It's usually not compiled in, * but when it is it can be dynamically enabled at runtime for certain busses. |