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device/smbus: Add i2c_eeprom_read

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Expose the existing i2c block read functionality usually used in
romstage to the smbus_bus_operations for use in ramstage.

This allows faster reading of I2C EEPROM in ramstage.

TEST=Can read I2C EEPROM on Lenovo X220 using I2C block read.

Change-Id: I1264f17317c3095f9661b0ab6aa3124a00ce86c5
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/91028
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Alicja Michalska <ahplka19@gmail.com>
This commit is contained in:
Patrick Rudolph 2026-01-31 07:23:55 +01:00 • committed by Matt DeVillier
commit c242193ca4
3 changed files with 27 additions and 4 deletions
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2
src/include/device/smbus.h
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@ -16,6 +16,7 @@ struct smbus_bus_operations {
int (*block_read)(struct device *dev, u8 cmd, u8 bytes, u8 *buffer);
int (*block_write)(struct device *dev, u8 cmd, u8 bytes,
const u8 *buffer);
int (*i2c_eeprom_read)(struct device *dev, u8 offset, u8 bytes, u8 *buffer);
};
static inline const struct smbus_bus_operations *ops_smbus_bus(struct bus *bus)
@ -54,6 +55,7 @@ static inline int smbus_write_byte(struct device *const dev, u8 addr, u8 val)
int smbus_block_read(struct device *dev, u8 cmd, u8 bytes, u8 *buffer);
int smbus_block_write(struct device *dev, u8 cmd, u8 bytes, const u8 *buffer);
int smbus_i2c_eeprom_read(struct device *dev, u8 cmd, u8 bytes, u8 *buffer);
#endif
#endif /* DEVICE_SMBUS_H */