Enhance the DesignWare I2C driver to support address length more than 1 byte. This enhancement is required as some I2C slave device such as EEPROM chip might have 16 bit address byte.
Signed-off-by: Chin Liang See <[email protected]> Cc: Alexey Brodkin <[email protected]> Cc: Tom Rini <[email protected]> cc: Armando Visconti <[email protected]> Cc: Stefan Roese <[email protected]> Cc: Albert ARIBAUD <[email protected]> Cc: Heiko Schocher <[email protected]> Cc: Vipin KUMAR <[email protected]> Cc: Tom Rix <[email protected]> Cc: Mischa Jonker <[email protected]> --- drivers/i2c/designware_i2c.c | 24 +++++++++--------------- 1 file changed, 9 insertions(+), 15 deletions(-) diff --git a/drivers/i2c/designware_i2c.c b/drivers/i2c/designware_i2c.c index cb2ac04..c0ac5f7 100644 --- a/drivers/i2c/designware_i2c.c +++ b/drivers/i2c/designware_i2c.c @@ -205,27 +205,21 @@ static int check_params(uint addr, int alen, uchar *buffer, int len) return 1; } - if (alen > 1) { - printf("addr len %d not supported\n", alen); - return 1; - } - - if (addr + len > 256) { - printf("address out of range\n"); - return 1; - } - return 0; } -static int i2c_xfer_init(uchar chip, uint addr) +static int i2c_xfer_init(uchar chip, uint addr, int alen) { if (i2c_wait_for_bb()) return 1; i2c_setaddress(chip); - writel(addr, &i2c_regs_p->ic_cmd_data); - + while (alen) { + alen--; + /* high byte address going out first */ + writel((addr >> (alen * 8)) & 0xff, + &i2c_regs_p->ic_cmd_data); + } return 0; } @@ -269,7 +263,7 @@ int i2c_read(uchar chip, uint addr, int alen, uchar *buffer, int len) if (check_params(addr, alen, buffer, len)) return 1; - if (i2c_xfer_init(chip, addr)) + if (i2c_xfer_init(chip, addr, alen)) return 1; start_time_rx = get_timer(0); @@ -310,7 +304,7 @@ int i2c_write(uchar chip, uint addr, int alen, uchar *buffer, int len) if (check_params(addr, alen, buffer, len)) return 1; - if (i2c_xfer_init(chip, addr)) + if (i2c_xfer_init(chip, addr, alen)) return 1; start_time_tx = get_timer(0); -- 1.7.9.5 _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
