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omap24xx_i2c: Implement CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW

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Signed-off-by: Guy Thouret <guy.thouret@wems.co.uk>
Cc: Heiko Schocher <hs@denx.de>
This commit is contained in:
Guy Thouret 2016-03-11 16:23:41 +00:00 • committed by Heiko Schocher
parent e1bed80272
commit 32b9b556f7
1 changed files with 34 additions and 0 deletions

34
drivers/i2c/omap24xx_i2c.c
View file

@ -371,6 +371,23 @@ static int omap24_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr,
return 1; return 1;
} }
#ifdef CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW
/*
* EEPROM chips that implement "address overflow" are ones
* like Catalyst 24WC04/08/16 which has 9/10/11 bits of
* address and the extra bits end up in the "chip address"
* bit slots. This makes a 24WC08 (1Kbyte) chip look like
* four 256 byte chips.
*
* Note that we consider the length of the address field to
* still be one byte because the extra address bits are
* hidden in the chip address.
*/
if (alen > 0)
chip |= ((addr >> (alen * 8)) &
CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW);
#endif
/* Wait until bus not busy */ /* Wait until bus not busy */
if (wait_for_bb(adap)) if (wait_for_bb(adap))
return 1; return 1;
@ -501,6 +518,23 @@ static int omap24_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr,
return 1; return 1;
} }
#ifdef CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW
/*
* EEPROM chips that implement "address overflow" are ones
* like Catalyst 24WC04/08/16 which has 9/10/11 bits of
* address and the extra bits end up in the "chip address"
* bit slots. This makes a 24WC08 (1Kbyte) chip look like
* four 256 byte chips.
*
* Note that we consider the length of the address field to
* still be one byte because the extra address bits are
* hidden in the chip address.
*/
if (alen > 0)
chip |= ((addr >> (alen * 8)) &
CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW);
#endif
/* Wait until bus not busy */ /* Wait until bus not busy */
if (wait_for_bb(adap)) if (wait_for_bb(adap))
return 1; return 1;